Milling machine vm 127. Specialized milling machine cantilever BM127. Vertical milling machine BM127 - general characteristics

The release of the machine tool for performing milling work BM127 was mastered at the Votkinsk Machine-Building Plant, which still operates under the name "Votkinsk Plant".

1 Vertical milling machine BM127 - general characteristics

At the Votkinsk plant, metal-cutting units have been produced since the mid-1950s. The machine we are describing was the very first modification of the VM-series equipment. Its technical parameters are similar to those of such units as 6T13, 6P13, FSS450R, 6M13. Today, the plant produces more modern versions of the machine - VM130M, VM127M, VM133, but their "ancestor" is also quite popular at enterprises specializing in small-scale production.
This cantilever milling unit makes it possible to carry out high-quality processing of workpieces from different materials (from hot-rolled and steel, non-ferrous alloys, all types of cast iron).

For these purposes, cylindrical, end, radius and end mills are used. The use of other cutting milling tools is also allowed.

The machine can be built into multi-unit production lines (it can operate in fully automatic and semi-automatic cycles) or used independently for processing frames, grooves, any planes (inclined, horizontal, vertical), gears, corners, and so on. Its demand among small firms is due to the possibility of easy readjustment of the cutting tool and special devices, as well as the ease of performing maintenance activities. The machine allows one hundred percent to use the potential of the tool from.
Among the advantages of the unit is also worth highlighting:

the presence of an efficient main drive motor (its power is 11 kW), an X14-22M coolant pump with a capacity of 22 l / min and a power of 0.12 kW, as well as an additional feed drive motor (3 kW);
lubrication of equipment in automatic mode;
high reliability and real unpretentiousness of the installation in difficult operating conditions;
the presence of a number of mechanisms that simplify the work with the unit: overload protection clutch, blocking the inclusion of feeds according to a separate scheme, spindle braking, longitudinal intermittent automatic feed, blocking any type of mechanical and manual feed, feed stops that turn off the nodes.

These advantages provide high efficiency and ease of operation of machine tool milling equipment. It is these factors that are important for situations where it is necessary to process small batches of parts.

2 Milling machine BM127 - technical specifications

Components of the unit:

bed;
boxes: feeds, switching spindle speeds, speeds;
console;
swivel head;
clamping mechanism (electromechanical principle of operation) of the tool;
sled table;
electrical equipment.

The machine spindle has the following characteristics:

quill movement: 0.05 mm - per limb division, 4 mm - limb turnover;
number of available operating speeds - 18;
rotation speed: maximum - 1600 rpm, minimum - 31.5 rpm;
possible head rotation angle – 45°;
axial movement of the quill (the largest possible) - 80 mm;
torque (maximum) - 137 Nm;
cone - 50;
the spindle end is made according to the conditions of the standard 836-72.

The working table of the unit is described by the following indicators:

width - 400 mm, length - 1600 mm;
movement per revolution (one) of the limb: 2 mm - vertical, 6 mm - transverse, 4 mm - longitudinal;
center load (maximum) - 300 kg;
table movement (maximum values): 420 mm - by hand in a vertical plane, mechanical vertically - 400 mm, by hand transverse - 320 mm, mechanical transverse - 300 mm, manual and mechanical longitudinal - 1000 mm;
distance from the guides (vertical) of the frame to the spindle axis - 620 mm;
the distance from the table to the end of the spindle can vary between 30–500 mm;
the number of grooves (they have the shape of the letter "T") - 3;
H - accuracy class in accordance with State Standard 8–82.

The mechanics of the machine is characterized by such important quantities as:

8.3-416.6 mm / min - the boundaries of vertical feeds, 25-1250 mm / min - longitudinal and transverse;
high speed - 1000 and 3000 mm / min (respectively, vertical, transverse and longitudinal);
feed steps ( total number) – 18.

3 Kinematics and electrical equipment of the console-milling unit

The flanged electric motor drives the main movement using a flexible coupling for this purpose. 18 different speeds are reported to the spindle by the gearbox. And you can change the number of its revolutions by means of gear blocks (there are three of them in the machine), which you want to move along splined shafts.

The flanged motor also produces the feed drive. The toothed mobile wheel and three-crown blocks (two of them are mounted in the design of the installation) transmit 18 feeds to the console through a safety ball clutch. After that, they can be directed to the screws of vertical, transverse and longitudinal movement by engaging the cam-type clutch.

If the operator initiates the rapid travel clutch, it becomes possible to set the machine to rapid movements. The feed clutch is interlocked with this clutch, so they cannot start working at the same time. The rotation of the clutch is carried out directly from the feed motor through gear intermediate wheels. Note that longitudinal feeds are always three times greater than vertical feeds.

The installation spindle is located in a retractable sleeve, it is made in the form of a shaft with two supports. During operation, it may be necessary to adjust the backlash (axial) in the spindle. This is easy to do by grinding the rings available in the design of the unit. If the front bearing needs to be adjusted (it also often has increased play), you can tighten the nut of this assembly or grind the half rings.

The basic component of the machine is the bed. It is attached to the base according to a rigid scheme and is securely fixed with the help of pins. The bed serves as a platform for placing all other elements and components of the milling unit.

Equally important for the adequate functioning of the unit is its rotary head. It is connected with four bolts to the neck of the frame, in the annular groove of which it is centered. The bolts enter into a flange slot, characterized by a T-shaped configuration.

Separately, let's say about the electrical equipment of the described machine. It has the following characteristics:

24-volt local lighting;
63-amp current (rated value) of the circuit breaker and fuses that perform a protective function;
20-ampere total current of simultaneously operating electric motors, of which three are installed on the machine;
65 V DC and 110 V AC in control circuits.

Electrical equipment operates at a standard current frequency (50 Hz) under a voltage of 380 V.

Details Category: Milling Machines

The vertical cantilever milling machine model BM127 is designed for milling all kinds of parts made of steel, cast iron and non-ferrous metals and alloys with face, end, cylindrical. radius and other cutters. The weight of the part with the fixture is up to 300 kg.
The machine can process vertical, horizontal and inclined planes, grooves, corners, frames, gears, etc.
The technical characteristics and rigidity of the machine make it possible to fully use the capabilities of high-speed and carbide tools.
The ability to configure the machine for various semi-automatic and automatic cycles allows you to organize multi-machine maintenance.
The machine is designed to perform milling work in the conditions of individual and serial production.

Kinematic scheme

Main drive

The drive of the main movement is carried out from the flange electric motor through an elastic coupling.
The spindle speed is changed by moving three toothed blocks along the splined shafts.
The gearbox informs the spindle of 18 different speeds.
The graph of the machine spindle revolutions, explaining the structure of the main movement mechanism, is shown in fig. 9.

Feed drive

The drive of giving is carried out from the flange electric motor mounted in the console. By means of two three-crown blocks and a movable gear wheel with a cam clutch, the feed box provides 18 different feeds, which are transmitted through a ball safety clutch to the console and then, when the corresponding cam clutch is turned on, to the screws of longitudinal, transverse and vertical movement.
Accelerated movements are obtained when the high-speed clutch is turned on, the rotation of which is carried out through intermediate gears directly from the feed electric motor.

The clutch is interlocked with the working feed clutch, which eliminates the possibility of their simultaneous activation.
A graph explaining the structure of the machine feed mechanism is shown in fig. 10. Vertical feeds are 3 times less than longitudinal feeds.

bed

The bed is the base unit on which the rest of the units and mechanisms of the machine are mounted.
The frame is rigidly fixed on the base and fixed with pins.

Swivel head

The swivel head (fig. 14) is centered in the annular undercut of the neck of the frame and is attached to the foam with four bolts included in the T-shaped groove of the flange.
The spindle is a two-bearing shaft mounted in a retractable sleeve. The regulation of the axial play in the spindle is carried out by grinding the rings 3 and 4. The increased play in the front bearing is eliminated by grinding the half rings 6 and tightening the nut 1.

through the hole, by unscrewing the screw 2, the nut 1 is unlocked;
nut 1 is locked with a steel rod. The nut is tightened along the spindle collar by the cracker and this moves the inner race of the bearing!
the gap between the bearing and the shoulder of the spindle is measured with a probe, after which the half rings 6 are ground to the required value "
half rings are put in place and fixed:
flange 5 is screwed on. To eliminate a radial play of 0.01 mm, the half rings must be ground by approximately 0/12 mm.
After checking the play in the bearing, the spindle is run in at the maximum speed.
The heating value of the bearings is characterized by measuring the temperature of the inner surface of the conical hole with an electrothermometer.
The excess temperature of the tool cone surface should not exceed 55°C.
The rotation of the spindle is transmitted from the gearbox through a pair of bevel and a pair of cylindrical gears mounted in the head.
The lubrication of bearings and gears of the rotary head is carried out from the frame pump, and the lubrication of the sleeve movement mechanism is by syringe.

Gearbox

The gearbox was mounted directly in the bed frame. The connection of the box with the motor shaft is carried out by an elastic coupling, which allows misalignment in the motor installation up to 0.5-0.7 mm.
Inspection of the gearbox can be done through the window on the right side.
Lubrication of the gearbox is carried out from a plunger pump (Fig. 13), driven by an eccentric. pump performance; about 2 l/min. Oil is supplied to the pump through a filter. From the pump, oil enters the oil distributor, from which it is discharged through a copper tube to the peephole for monitoring the operation of the pump and through a flexible hose to the swivel head. The elements of the gearbox are lubricated by spraying oil coming from the holes of the oil distributor tube located above the gearbox.

Gear box

The gearbox allows
select the required speed without successive passage of intermediate steps.
Rail 1 (Fig. 16). moved by the switching handle 5, through the sector 2 through the fork 8 (Fig. 15) moves the main roller with the switching disk 7 in the axial direction.

The shift disc can be rotated with speed indicators 9 through bevel gears 14 and 16. The disc has several rows of holes of a certain size located against the pins of the racks 17 and 19.
The rails engage in pairs with the gear wheel 18. A shift fork is attached to one of each pair of rails. When the disk is moved by pressing on the pin of one of the pair, the reciprocating movement of the rails is provided.
In this case, the forks at the end of the disk stroke take a position corresponding to the engagement of certain pairs of gears. To exclude the possibility of a hard stop of the gears when switching, the pins of the 6 racks are spring-loaded.
The fixation of the dial when choosing the speed is provided by the ball 13, which jumps into the groove of the sprocket 10.
The adjustment of the spring 11 is made by the plug 12, taking into account the precise fixation of the limb and the normal force when it is turned.
The handle 5 (see Fig. 16) is held in the on position by spring 4 and ball 3. In this case, the spike of the handle enters the groove of the flange.
Correspondence of the speeds to the values indicated on the pointer is achieved by a certain position of the bevel gears along the engagement. The correct engagement is established by the cores at the ends of the mating tooth and cavity or by setting the pointer to the speed position of 31.5 rpm. and disc with forks to the speed position of 81.5 rpm. The gap in the gearing of the conical pair should not be more than 0.2 mm, since the disc can turn up to 1 mm due to this.

Gearbox

The feed box provides working feeds and fast movements of the table, sled and console. See the kinematics of the feed box in fig. eight.
The rotation speeds obtained as a result of switching blocks are transmitted to the output shaft 7 (Fig. 17) through a ball safety clutch, a cam clutch 15 and a bushing 16, connected by a key to the cam clutch 15 p to the output shaft 7.
When the feed mechanism is overloaded, the balls in contact with the holes of the cam bushing 17 compress the springs and come out of contact. In this case, the gear wheel 2 slips relative to the cam bushing 17 and the working feed stops. Fast rotation is transmitted from the electric motor, bypassing the feed box, to the gear wheel 6, which sits on the shank of the clutch housing 10 and thus has a constant number of revolutions. During installation, it is necessary to check the tightness of the nut 8. The friction clutch housing must rotate freely between the gear wheel 9 and the thrust bearing.
The clutch discs are connected through one to the clutch housing, which constantly rotates, and the sleeve 4, which, in turn, is connected by a key to the output shaft 7.
When the cam clutch 15 is pressed on the end of the sleeve 14 and then on the nut 5, the disks 11 and 12 are compressed and transmit rapid rotation to the output shaft 7 and the gear wheel 9.
When adjusting the safety clutch, cover 19 is removed (Fig. 18) and plug 20 is unscrewed.

Gear shift box

The feed shift box (Fig. 19) is included in the feed box assembly. The principle of its operation is logical to the operation of the gearbox.
To prevent displacement of the disk 21 in the axial direction, the roller 29 is locked in the on position by a ball.
Fixation of the rotation of the switching disk: 21 is carried out by a ball; 22 through the locking fork 25, connected with a key to the roller 29. The force of fixing the rotation of the switching disk is regulated by a screw plug 23.
The feed box is lubricated by spraying oil from the console lubrication system. In addition, there is a hole in the lower part of the console plate (drilling into the discharge cavity of the lubrication pump), through which the lubricant enters the oil distributor of the feed box.
From the oil distributor, two tubes are discharged: a peephole for controlling the operation of the pump and for lubricating the bearings. Oil is supplied directly through the oil distributor to lubricate the friction clutch bearings.

Console

The console is the basic node that unites the nodes of the feed chain of the flock. A number of shafts and gears are mounted in the console, transmitting movement from the feed box in three directions - to the screws of the longitudinal, transverse and vertical feeds, the mechanism for switching on the high speed "feed electric motor. The "console" assembly also includes a mechanism for switching on transverse and vertical feeds.
The gear wheel 8 (Fig. 20) receives movement from the wheel 9 (see Fig. 17) and transmits it to the gear wheels 7, 4, 2 and 1 (see Fig. 20). The gear wheel 4 is mounted on a bearing and can transfer the movement to the shaft only through the cam clutch 6. Further, through a pair of cylindrical and a pair of conical wheels, the movement is transmitted to the screw 14 (Fig. 21).
The engagement of the conical pair 10 and 15 is adjusted by the compensators 12 and 13 and fixed with a screw included in the drilled pin 11.
Sleeve 16 is of technological importance and is never dismantled.
The vertical movement nut is fixed in the column. The column is installed exactly on the screw and fixed with pins on the base of the machine.
The gear wheel 2 (see Fig. 20), mounted on the sleeve, constantly rotates the splined shaft IX of the longitudinal chain through the key and splines.
The cross feed screw X receives rotation through the gear wheel 2 and the wheel 1 freely sitting on the shaft when the cross travel cam clutch is engaged.
To dismantle shafts VII and VIII, it is necessary to remove the feed box and the cover on the left side of the console, then unscrew the stoppers at the gears 8 and 9 through the console window.
The slide can be dismantled after dismantling the splined shaft IX.
When dismantling the sled, the cross-travel bracket or cross-feed screw must also be dismantled.

The mechanism of inclusion of vertical and transverse feeds

The mechanism for turning on the vertical and transverse feeds is made in a separate housing and controls the switching on and off of the cam clutches of the transverse and vertical feeds and the feed motor. When the handle moves to the right or left, up or down, the drum 32 associated with it (Fig. bevels It controls the switching on of the cam clutches through the lever system, and through the pins - instantaneous limit switches located below the mechanism and designed to reverse the feed motor. Link 33 connects the drum with a backup handle. In its middle part, a lever is fixed on it, on which cams act, limiting the transverse stroke. At the end, the rod has a lever to limit vertical movements. When turning on and off the transverse stroke, the rod moves forward, and the vertical stroke turns.
Blocking ”protecting the handwheel and the handle of manual movements from turning on when the mechanical feed is turned on, includes a rocker arm 6 and a pin 5 (see Fig. 20).
When you turn on the cam clutch handle on-. when the clutch is moved, the rocker arm 6 rotates, moves the pin, which rests against the bottom of the cam clutch of the handwheel or handle, and moves them away, preventing the cams from engaging.
If the system has an increased backlash, it is necessary to press out the shaft plug VII, unlock the nut 30 (see Fig. 23) and tighten the screw 31. After checking the backlash, it is necessary to carefully lock the nut 30.
The console lubrication system includes a plunger pump (Fig. 24), a spool valve (Fig. 25), an oil distributor and pipes extending from it, supplying oil to bearings, gears, screws of transverse and vertical movements. The plunger pump for lubrication of the console, feed box, mechanisms of the “table-sled” assembly sucks oil through the filter screen from the oil bath and delivers it through the tube to the spool valve.
Pipe-kp for lubrication of the vertical guides of the console are discharged from the spool valve, to the fitting of the flexible lubrication hose of the “table-sled” assembly and to the console oil distributor. The pump output is about 1 l/min.

Table and sled

The table and sled (Fig. 26) provide longitudinal and transverse movement of the table.

The lead screw 1 receives rotation through the sliding key of the sleeve 9, mounted in the bushings 5 and 7. The sleeve through the splines receives rotation from the cam clutch 6 when it engages with the cams of the sleeve 5, which is rigidly connected to the bevel gear 4. The sleeve 5 has a gear rim, with which engages the gear wheel of the round table drive. The cam clutch 6 has a ring gear for rotating the longitudinal feed screw when moving from the handwheel. The gear wheel 45 (Fig. 30) is spring-loaded in case of tooth-to-tooth contact. Engagement with gear 45 can only be in case of disengagement of clutch 6 from sleeve 5 (see Fig. 20).
Thus, the handwheel 24 (Fig. 30) is blocked during mechanical feeds.
Nuts 2 and 3 of the lead screw (Fig. 26) are located on the left side of the slide. The right nut 3 is fixed with two pins in the body of the slide, the left nut 2, resting its end against the right nut, when turning it with a worm, selects the backlash in the screw pair. To adjust the gap, it is necessary to loosen the nut 11 (Fig. 27) and, turning the roller 10, tighten the nut 2 (Fig. 26). The choice of backlash must be made until the backlash of the lead screw, checked by turning the longitudinal stroke handwheel, is no more than 3-5 ° and until the screw is jammed in any area necessary for the working stroke when the table is moved manually.
After adjustment, tighten the lock nut 11 (see Fig. 27), fix the roller 10 in the set position.
The table at its ends is connected to the lead screw through brackets, the installation of which is carried out according to the actual location of the screw, and is fixed with control pins. Thrust bearings are mounted on different ends of the screw, which eliminates the possibility of its operation in buckling. When mounting the screw, a preload of the lead screw is provided with nuts with a force of 100-125 kg.
The gap in the directions of the table and slide is selected with wedges. The wedge 12 of the table (Fig. 28) is adjusted with the nuts 13 p 15 loosened by tightening the screw 14 with a screwdriver.
After checking the adjustment by manually moving the table, the nuts are securely tightened.
The gap in the guide sled is adjusted with clip 17 using screw 10. The degree of regulation is checked by moving the sled manually.
The clamping of the slide on the console guides is provided by the bar 8 (see Fig. 26).

Wiring diagram

The wiring diagram allows you to work on the machine in the following modes: "Control from the handles", "Automatic control" of the longitudinal movements of the table" "Round table".

The machine is connected to the network and turned off by the introductory switch S 1. The choice of the operating mode is made by the switch S 6. The operation of the machine in the setup mode with the spindle not rotating is ensured by setting the reversing switch S 2 to the middle bullet position.

ATTENTION!

BEFORE DISCONNECTING THE MACHINE FROM THE NETWORK OR REVERSING WITH THE SPINDLE ELECTRIC MOTOR WORKING, IT IS NECESSARY TO DISCONNECT THE ELECTRIC MOTOR BY THE STOP BUTTON.

To facilitate the switching of spindle and feed speeds, the machine provides pulsed switching on of the spindle motor with the button and the feed motor with the pulse limit switch S 14. When the S 9 button is pressed, K4 and K "1 are turned on. NO contacts K1 turn on a short circuit relay, which due to of its NO contact become self-powered, and the NC contact breaks the K4 power supply circuit.
- When controlled from the handles, the operation of the electrical circuit is ensured by closing the working chains through the contacts of the S17 command devices; S19; S15;S16;S20 Switching on and off of the feed motor is carried out by two command devices: for longitudinal feed S 17; S 19, for vertical and transverse feed - S5; S6. Turning on and off the rotation of the spindle is carried out respectively by the buttons "Start", S 10, S 11, "Stop" 7. S8. The "Stop" button, simultaneously with turning off the spindle rotation motor, also turns off the feed motor.
The rapid movement of the table occurs when the S 12 button "Fast" is pressed, which turns on the high-speed electromagnet V1 with a short-circuit starter.
The braking of the spindle motor is electrodynamic and is carried out by the starter K2, which creates a DC circuit from the rectifier VI to the stator winding. Voltage relay K1 serves to protect diodes from breakdown. The winding voltage T1 is 36 V at a mains voltage of 220 V and 65 V at a mains voltage of 380 V.
When working on one of the feeds, the possibility of accidentally switching on the other feed is mutually excluded, blocking is carried out by limit switches S 15-S19.
With automatic control, switch S 6 must be set to the "Automatic cycle" position. In addition, it is necessary to mechanically switch the roller located in the machine slide to the “Automatic cycle” position.
In the last position of the roller, the longitudinal cam clutch is locked and the limit switch S 20 is pressed.
Automatic control is carried out using cams mounted on the table. When the table moves, the cams, acting on the longitudinal feed enable handle (see Fig. 34) and the upper sprocket 2, make the necessary switching in the electrical circuit and mechanisms.
The high speed control in automatic cycles is carried out by the S 18 limit switch. The S 20 limit switch excludes the possibility of switching on the transverse and vertical feeds in this operating mode. The operation of the electrical circuit in this mode is explained by the Diagram and proceeds as follows: with the handle 1 turned off, the stem 4 must be in the deep cavity of the sprocket 3, contacts 41-17 of the limit switch S 18 must be closed (position 0 on the diagram). Turning the handle 1 to the right activates the rapid movement of the table to the right (position 1 on the diagram). Disabling the high speed at the desired point occurs when the cam za acts on the sprocket 2 (position 2 on the diagram), when it is turned, the stem 4 enters the small cavity of the sprocket 3, and both contacts of the limit switch S18 open. The table continues to move forward. When the cams 1a and 3b act on the handle 1 and the sprocket 2, the feed is reversed and the fast stroke is turned on to the left (positions 3 and 4 in the diagram). When handle 1 passes through position 0, starter Ko is powered through contacts 33-43 of limit switch S 18. Rod 4 at this moment should be in the area of constant curvature of sprocket 3 (position 3 on the diagram). Disabling the fast run to the left and the end of the cycle is carried out when the handle 1 is moved by the cam 6 to the neutral position (position 5 in the diagram).
The operation of the electrical circuit on other cycles is similar.

Very common in the area former USSR series milling machine, which allows milling parts of small and medium sizes in conditions of single and small-scale production. The machine can process vertical, horizontal and inclined planes, grooves, corners, frames, etc. Machine analogue: 6P13, 6T13, FSS450MR.

Ease of maintenance

The ease of maintenance of the BM127 vertical milling machine, the reconfiguration of the mechanism and the tool itself provide a certain comfort when using the machine in small-scale production. Even in the most ruthless operating conditions, the automatic lubrication system of the units ensures the ease of use and the performance of the machine.

Design features

The powerful drive of the main movement and smooth feed rate adjustment ensures optimal machining conditions under various cutting conditions and full use of the cutting tool's capabilities.
Servo control feed drive with feedback
The semi-automatic lubrication system of the units ensures the unpretentiousness and reliability of the machine in the most severe operating conditions.
On a separate order, the machine can be equipped with a digital display device (DRO).

Specifications	Options
Dimensions of the working surface of the table, mm	1600 x 400
Number of T-slots	3
800
The greatest longitudinal movement of the table, mm	1010
The greatest transverse movement of the table, mechanical / manual, mm	300 / 320
The greatest vertical movement of the table, mechanical / manual, mm	400 / 420
Longitudinal movement of the table by one division of the limb, mm	0,05
Transverse movement of the table by one division of the limb, mm	0,05
Vertical movement of the table by one division of the limb, mm	0,05
Longitudinal movement of the table for one turn of the limb, mm	4
Transverse movement of the table for one turn of the limb, mm	6
Vertical movement of the table for one revolution of the limb, mm	2
Spindle taper	AT50
The greatest movement of the spindle quill, mm	80
Manual movement from the end of the spindle to the working surface of the table, mm	30 - 500
Distance from the spindle axis to the vertical guides of the frame, mm	420
Angle of rotation of the spindle head, degrees	±45
Number of spindle speeds	18
Longitudinal feed speed, working / accelerated, mm / minute	25-1250 / 3000
Cross feed speed, working / accelerated, mm / minute	25-1250 / 3000
Vertical feed speed, working / accelerated, mm / minute	8,3-416,6 / 1000
Power of the electric motor of the main movement, kW	11
Feed drive electric motor power, kW	2,1
Power of the electric liquid cooling pump, kW	0,12
Productivity of the electric pump of a cooling liquid, l/min.	22
Machine accuracy class	H
Weight of workpieces with fixture, kg	800
Overall dimensions of the machine (L x W x H), mm	2560 x 2260 x 2500
Machine weight with electrical equipment, kg	4200

Vertical milling machine BM127, BM127M today

Vertical milling machine VM127, VM127M was produced at several enterprises of the former USSR. Most of these businesses no longer exist. At the same time, the leading machine tool factories switched to the production of more modern machine tools, focused on modern instrument and high speeds cutting. Such machines are equipped with modern high-quality components and reliable electrics. Thanks to the use of computer-aided design of beds, a higher accuracy class for a milling machine produced in a modern factory is rather the rule today. At the same time, the prices for modern machines are quite comparable with the prices for machines of an outdated design.

Price

BM127 vertical console milling machine. Purpose, scope

Cantilever vertical milling machine model BM127 is designed for milling all kinds of parts made of steel, cast iron and non-ferrous metals and alloys with face, end, cylindrical, radius and other cutters in the conditions of individual, small-scale and serial production. The weight of the part with the fixture is up to 300 kg.

The machine can process vertical, horizontal and inclined planes, grooves, corners, frames, gears, etc.

The ability to configure the machine for various semi-automatic and automatic cycles allows you to organize multi-machine maintenance.

The powerful drive of the main movement of the BM 127 machine and carefully selected gear ratios provide optimal processing conditions under various cutting conditions and full use of the capabilities of high-speed and carbide tools.

Ease of maintenance of the BM127 machine, changeover of fixtures and tools is a significant convenience when using the machine in small-scale production.

The automatic lubrication system of the units ensures the unpretentiousness and reliability of the machine in the most severe operating conditions.

General view of the vertical console milling machine BM127 with DRO

The location of the components of the console milling machine BM127

Specification of the components of the console milling machine BM127

Bed - VM127.01.010

Gearbox - BM127.03.010

Swivel head - 6Р13.31.01В

Table - sled - 6R13.7.01B

Console - 6R13.6.01B

Feed box - BM127.4.01

Electrical equipment - 6Р13.8

Spindle gear box - 6Р13.5.01

Electromechanical tool clamping device - 6Р13К.93.000

The location of the controls for the milling machine BM127

List of controls for the milling machine BM127

Stop button (duplicate)

Spindle start button (duplicate)

Spindle speed arrow

Spindle speed indicator

Quick table button (duplicate)

Spindle pulse button

Tool clamp-release switch

Head rotation

Spindle sleeve clamp

Automatic cycle sprocket

The handle of inclusion of longitudinal movements of a table

Table clamps

Handwheel for manual longitudinal movement of the table

Quick table button

Spindle start button

Stop button

Manual or automatic control longitudinal movement of the table

Flywheel for manual transverse movements of the table

Handle for manual vertical movement of the table

vernier ring

The limb of the mechanism of transverse movements of the table

Button for fixing the fungus of switching feeds

feed switch fungus

Table feed indicator

Arrow-pointer table feeds. The handle of inclusion of cross and vertical giving of a table

Slider clip on console rails

The handle of inclusion of longitudinal movements of a table (duplicate)

Handwheel for manual longitudinal movement of the table (duplicate)

On/Off input switch

Coolant Pump On/Off Switch

Switch for the direction of rotation of the spindle "left-right"

Spindle gear lever

Automatic or manual control switch and round table operation

Clamping the console on the bed

Spindle sleeve extension handwheel

Clamping the head on the bed

Kinematic diagram of the milling machine BM127

The drive of the main movement is carried out from the flange electric motor through an elastic coupling.

The spindle speed is changed by moving three toothed blocks along the splined shafts.

The gearbox informs the spindle of 18 different speeds.

Accelerated movements are obtained when the high-speed clutch is turned on, the rotation of which is carried out through intermediate gears directly from the feed electric motor.

The clutch is interlocked with the working feed clutch, which eliminates the possibility of their simultaneous activation. Vertical feeds are 3 times less than longitudinal

The bed is the base unit on which the rest of the units and mechanisms of the machine are mounted and is rigidly fixed to the base and fixed with pins.

The swivel head (Fig. 14) is centered in the annular groove of the bed neck and is attached to it with four bolts included in the T-shaped groove of the flange.

The spindle is a two-bearing shaft mounted in a retractable sleeve. Axial play in the spindle is adjusted by grinding rings 3 and 4. Increased play in the front bearing is eliminated by grinding semi-rings 6 and tightening the nut.

Technical data and characteristics of the machine BM127 and BM127M

Parameter name		VM127M
Desktop
Accuracy class according to GOST 8-82

Dimensions of the working surface of the table (length x width), mm
Number of T-slots Dimensions of T-slots
The greatest movement of the table is longitudinal mechanical and manual, mm
The greatest movement of the table is transverse mechanical, mm
The greatest movement of the table transverse by hand, mm
The greatest movement of the table vertical mechanical, mm
The greatest movement of the table is vertical by hand, mm
The smallest and largest distance from the end of the spindle to the table during manual movement, mm * The size of 30 mm is provided by extending the spindle
Distance from the spindle axis to the vertical guides of the frame, mm
Movement of the table by one division of the limb (longitudinal, transverse, vertical), mm
Movement of the table for one turn of the limb longitudinal, mm
Movement of the table for one revolution of the limb transverse, mm
Movement of the table for one turn of the limb vertical, mm
Spindle
Spindle speed, rpm
Number of spindle speeds
Maximum torque, kgf.m
Spindle End Sketch	GOST 836-72
Spindle taper
The greatest axial movement of the spindle quill, mm
Movement of the quill per one turn of the limb, mm
Movement of the quill by 1 division of the limb, mm
The greatest angle of rotation of the spindle head, hail
The price of one division of the head rotation scale, degrees
Machine mechanics
Fast travel of the table longitudinal and transverse, mm/min
Rapid travel table vertical, mm/min
Number of steps of working giving of a table
Working feed limits. Longitudinal and transverse, mm/min
Working feed limits. Vertical, mm/min
Switching feed stops (longitudinal, transverse, vertical)
Blocking of manual and mechanical feed (longitudinal, transverse, vertical)
Blocking of separate inclusion of giving
Automatic intermittent feed Longitudinal
Automatic intermittent feed Transverse and vertical
Spindle braking
Overload protection (clutch)
Drive unit
Number of electric motors on the machine
Main drive motor M1, kW
Coolant pump motor M2, kW
Feed drive motor M3, kW
Tool clamp motor M4, kW
Electric coolant pump Type
Coolant pump capacity, l/min
Machine dimension
Machine dimensions, mm	2560 x 2260 x 2430	2560 x 2260 x 2500
Machine weight, kg

Vertical drilling machine

Model 2S150

The machine is designed for drilling, countersinking, reaming and tapping in various parts using special adjustments.

Basic data

Maximum drilling diameter in mm
The largest stroke of the headstock in mm
Departure of the axis of the drive shaft in mm
The smallest and largest distance from the lower end of the headstock to the table in mm
Number of speeds
Limits of the number of revolutions of the drive shaft per minute
Number of innings
Headstock feed limits in mm/rev
The speed of the rapid moves of the headstock in m/min.
Working dimensions of the table in mm
Table move in mm
Main motor power in kW
Machine dimensions (length X width X height) in mm	1660X1200X3110
Machine weight in kg
Wholesale price of the machine in rubles.

Horizontal machines with a moving table are the most common group of diamond boring machines in the engineering industry. Consider briefly two models of these machines - 2712A and 2712C.

Diamond boring machine mod. 2712A. Horizontal diamond boring machine mod. 2732A of especially high accuracy, designed for double-sided final boring of holes located on the same axis, as well as for trimming ends in body parts.

The machine provides: hole diameter deviation in any section not more than 0.003 mm for holes with a diameter of 120 mm and 0.004 mm for holes with a diameter of 200 mm over a length of 100 mm; surface roughness of holes and cut ends when machining cast iron and steel parts within 0.634-2.5 microns, and when machining parts made of non-ferrous alloys within 0.04-0.32 microns.

On a box-shaped bed, there are spindle headstocks mounted on bridges with precisely machined lower and upper surfaces. Two T-slots are made along the top surface for fastening boring heads. Each head contains a spindle, in which a mandrel and a chuck for trimming are fixed. The table with the workpiece fixed on it moves along the guides of the bed.

The machine can operate both with manual control and with a semi-automatic cycle, adjusted using two cams that are fixed on the table; these cams act on two limit switches located on the machine bed. The workpiece is fixed in a fixture installed on the machine table; workpiece clamping, moving, fixing, turning into other auxiliary movements are carried out automatically.

Kinematic scheme of the machine mod. 2712A includes kinematic chains of the main movement and table feed.

Diamond boring machine mod. 2712C. This is one of the most accurate machines of this type. The machine provides processing accuracy in terms of diameter stability in the longitudinal section of 0.001 - 0.002 mm, roundness deviation of 0.0006-0.001 mm (smaller values for holes with a diameter of up to 32 mm, large 32-250 mm).

Such high machining accuracy is obtained due to the fact that hydrostatic spindle bearings are used in the boring heads, the temperature of the circulating lubricant is stabilized (freon cooling), and an elastic coupling is used in the head spindle rotation drive. The use of a mechanical table drive (instead of a hydraulic one) made it possible to reduce heat generation and vibrations. The electric motors of all drives of the machine are taken out of the frame, the rigidity of the carrier system is increased. To increase the straightness of the table movement, two V-shaped guides are used.

Note the features of hydraulic bearings (supports). Their main advantages are: high rotation accuracy, damping properties and practically unlimited durability, since there is no contact between the spindle and the support, they are separated by a thin layer of oil. This determines the prospects for their use in precision machine tools, when it is necessary to ensure high quality of finishing operations. Cylindrical bearings with hydrostatic lubrication are made with pockets evenly spaced around the circumference, each of which is supplied with lubricant under pressure through a throttling device.

The following main types of diamond boring machines are produced: horizontal with a movable table 230-500 mm wide, vertical and inclined multi-spindle machines with movable heads, aggregate machines different layouts, universal vertical single-spindle with a table that is fixed or moving in two directions, horizontal machines of a universal type with a movable table and coordinate movements of the working bodies.

Vertical milling machine BM127 belongs to one of the most common categories of machines designed for milling small parts and products of medium dimensions. The unit is able to process not only planes located vertically and horizontally, but also planes with an inclination. The device is operated for the production of small batches and for the production of single products.

Machine characteristics

The technical specifications for the machine are:

spindle taper type - 50AT5;
the maximum value of the quill movement along the axis is 80 mm;
number of speeds - 18;
a single revolution of the limb is equal to the movement of the quill by 4 mm;
spindle speed - up to 1999 rpm;
the spindle head is able to rotate 450 in both directions;
number of feed steps - 18;
number of grooves - 3;
machine weight - 4249 kg;
parameters of the working machine surface - 1600 by 401 mm;
maximum longitudinal movement of the table - 1010 mm;
vertical movement (maximum possible) - 401 mm;
transverse movement (maximum) - 300 mm;
feed rate in the transverse and longitudinal directions - 25-1249 mm/min;
vertical feed speed - up to 416.5 mm/min;
BM127 dimensions in length, width and height, respectively - 256 * 226 * 250 cm.

Machine spindle

This milling machine is equipped with two electric motors. The first engine of the main movement, having a power of 11 kW. The second feed drive motor has a power of 2.1 kW.

The electrical circuit of the BM 127 is supplemented with an electric pump designed to supply coolant to the working units of the unit. The power of the electric pump is 0.12 kW. The pump is capable of producing up to 22 liters of coolant within a minute.

Machine Features

The device is provided with enough powerful engine, allowing you to install a cutting tool made of high-speed steel on it. The milling unit can be used on production lines, which include a large number of devices.

The unit operates in both automatic and semi-automatic modes when setting up its main units.

The popularity of the machine in small enterprises is due to its ease of operation. The device has mechanisms that can be easily adjusted if necessary. This allows the device to be used in harsh environments. BM127 is characterized by unpretentiousness in use and is quickly repaired by any qualified craftsman.

Among the features of the machine stand out:

the equipment of the apparatus is lubricated automatically;
reliability of the unit in severe operating conditions;
the presence of a servo-control feed drive with feedback;
Possibility to equip the device with a digital indication device;
the ability to perform milling under different conditions due to the smooth control of the feed rate and a powerful drive;
functioning of the system for lubricating the elements of the apparatus, operating in a semi-automatic mode.

The device has mechanisms that greatly simplify the process of its use. This is provided by the following elements:

automatic feed of longitudinal intermittent type;
overload protection clutch;
feed stops that turn off the working elements of the unit;
system for blocking the inclusion of feeds;
blocking of manual and mechanical giving;
spindle braking system.

Basic mechanisms of the machine

The structure of the vertical milling unit includes the following elements:

bed;
console;
gearbox;
gearbox;
a box that switches spindle speeds;
sled table;
clamping mechanism for cutter;
swivel head;
electrical equipment.

The bed acts as a support for the machine. All the main devices of the unit are mounted on it. The bed is fixed on a solid foundation with pins.

The structure of the console includes numerous shafts and gears. Due to them, the rotation is transmitted from the feed box to the screws of the transverse and vertical feeds.

The gearbox is located inside the machine. This mechanism is subject to mandatory lubrication for normal operation. Lubrication occurs by spraying a special fluid using a plunger pump. The process takes place automatically.

The feed box is located on the left side of the console and is lubricated by its own system.

The mechanism for switching spindle speeds is located on the left side of the unit. The box device allows you to switch speeds in any chosen order.

The slide performs the function of moving the products that the machine processes.

The clamping mechanism for the cutter works according to the electromechanical scheme.

Installation of a rotary head happens in the top part of a bed. In this case, the bolts act as the installation material. Centering of the head occurs in the circular groove of the bed.

The spindle of the apparatus is a shaft consisting of two bearings. It is in a retractable sleeve. Spindle backlash correction is often required. The operation is carried out by grinding the rings located in the unit.

Electrical equipment of the machine

The following description is typical for the electrical equipment of the machine:

DC voltage - 65 V;
total current from three machine motors - 20 A;
local lighting voltage - 24 V;
AC voltage - 110 V;
current value for fuses and switch - 63 A.

The BM 127M milling unit, which replaced the outdated BM 127 model, is equipped with 5 switches:

introductory;
blocking feeds in the process of clamping the cutter;
starting the pulse type feed drive when the machine operator changes the speed of its operation;
turning off the cooling pump;
turning off the desktop drive.

Model 127M contains special starters:

triggering spindle braking;
fixing the time of stopping and turning on the spindle;
fixing the spindle braking index;
connecting a voltage of 380 V to the electric motor and pump of the machine;
launching a fast move;
regulating the activation of the drive.

Three-phase power supply is typical for electrical equipment. Secondary sources are powered by AC (110 V) and DC voltage of 56 V.

The specified milling machine has two control panels: front and side. Tasks run on the front console:

spindle stop;
turning on the spindle;
moving innings at an accelerated pace;
start the emergency stop function.

The side console is equipped with the following modes:

shutdown in case of an accident;
turn on the pump for cooling;
clamping and unclenching the cutter;
pulse switching on the spindle.