CN209986658U

CN209986658U - Four main shaft machining center special planes of high accuracy

Info

Publication number: CN209986658U
Application number: CN201920228427.5U
Authority: CN
Inventors: 陈文聪; 张继来; 吴航
Original assignee: Ningbo Mino Machine Tool Co Ltd
Current assignee: Ningbo Mino Machine Tool Co Ltd
Priority date: 2019-02-21
Filing date: 2019-02-21
Publication date: 2020-01-24
Anticipated expiration: 2029-02-21

Abstract

The utility model relates to the technical field of machining equipment, in particular to a high-precision four-spindle machining center special machine, which comprises a plurality of spindle seats, wherein spindles are arranged in the spindle seats, and the spindle seats positioned at the front and the rear of the spindle box are a front spindle seat and a rear spindle seat; the front main shaft or the rear main shaft is provided with a signal emitter, and the front main shaft or the rear main shaft opposite to the other side of the sliding seat is provided with a signal receiver. Set up signal transmitter on through preceding main shaft or the back main shaft, preceding main shaft or the back main shaft that the slide another side is relative sets up signal receiver, when can not receive the signal that signal transmitter sent through signal receiver, it is not at same height with other headstocks to embody the headstock to make control system adjust servo motor's rotational speed, and then make a plurality of headstocks get back to same height again, solved among the prior art headstock and not reached the processing region simultaneously, can have the problem of potential safety hazard.

Description

Four main shaft machining center special planes of high accuracy

Technical Field

The utility model relates to a machining equipment technical field specifically is a four main shaft machining center special planes of high accuracy.

Background

At present, a multi-axis numerical control machine tool refers to X, Y, Z direction movement shafts, workpiece rotation and the like, and has a plurality of independent spindle boxes, and each independent spindle box has a plurality of spindles therein, and all have independent control systems thereof, generally, the spindles are driven by a motor to move, and a mature motor synchronous technology is adopted to simultaneously drive the plurality of spindle boxes to move together, so that a cutter at the bottom end of each spindle is driven to process a workpiece.

And as the use times of the machine tool increase, chips can be attached to the inside and the outside of the spindle box; meanwhile, along with the increase of the use times of the motor, abrasion of different degrees can also occur. Under the conditions, a plurality of spindle boxes cannot reach a machining area at the same time, and further a plurality of workpieces cannot be machined at the same time, so that the working efficiency is reduced, potential safety hazards can be caused more seriously, and safety accidents are caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a four main shaft machining center special planes of high accuracy solves among the prior art a plurality of headstocks and does not reach the processing region simultaneously, can have the problem of potential safety hazard.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the high-precision four-spindle machining center special machine comprises a base, wherein a stand column is fixedly connected to the base, a cross beam stretching across the base is arranged on the stand column, a workbench capable of reciprocating along the X-axis direction is arranged on the base in a sliding mode, the workbench is located below the cross beam, a sliding seat capable of reciprocating along the Y-axis direction is arranged on the cross beam in a sliding mode, at least one pair of spindle boxes capable of reciprocating along the Z-axis direction are oppositely arranged on two sides of the sliding seat, a servo motor for driving the spindle boxes to reciprocate along the Z-axis direction is arranged in each spindle box, each spindle box comprises a plurality of spindle seats, the intervals between every two adjacent spindle seats are uniform, spindles are arranged in the spindle seats, detachable cutters are arranged at the bottoms of the spindles, and the spindle seats located at the front position and the rear position; the spindle box is internally provided with a control system for controlling the servo motor and the spindle, a signal emitter is arranged on the front spindle seat or the rear spindle seat, a signal receiver matched with the signal emitter is arranged on the front spindle seat or the rear spindle seat opposite to the other side of the sliding seat, the signal receiver always receives a signal of the corresponding signal emitter during working, and the working is suspended when the signal receiver does not receive the signal.

The principle of the utility model is as follows: the utility model discloses but a plurality of work pieces of simultaneous processing, machining efficiency is high, place a plurality of work pieces on the workstation earlier, at first along X axle direction slide table, make the work piece on the workstation slide to suitable processing position, then the slip of stop work platform, secondly slide, make the slide along Y axle direction, finally make a plurality of main shafts be in the top of a plurality of work pieces respectively, then open the servo motor in a plurality of headstocks simultaneously, make a plurality of servo motor move the headstock along Z axle direction with the initiative, main shaft and cutter are following the headstock and are moving together, wait to touch the work piece upper surface soon in the cutter bottom, then main shaft self begins to rotate, make the cutter process the work piece.

Corresponding signal transmitter and signal receiver initial state are at same height, preceding main shaft or the in-process of back main shaft to Z axle direction motion, signal transmitter is the emission signal always, when all headstocks are at same height, signal receiver can receive the signal always, but when at least one headstock is in the height of difference with other headstocks, signal receiver can not receive the signal, signal receiver can feed back control system, control system can suspend the motion of headstocks earlier, then the adjustment has the servo motor's at the headstock place of difference in height's with other headstocks rotational speed, make a plurality of headstocks reach same height once more, then the headstock can continue the motion, be convenient for a plurality of cutters carry out simultaneous processing to a plurality of work pieces.

The utility model has the advantages that: set up signal transmitter on through preceding main shaft or the back main shaft, preceding main shaft or the back main shaft that the slide another side is relative sets up signal receiver, when can not receive the signal that signal transmitter sent through signal receiver, it is not at same height with other headstocks to embody the headstock to make control system adjust servo motor's rotational speed, and then make a plurality of headstocks get back to same height again, solved among the prior art headstock and not reached the processing region simultaneously, can have the problem of potential safety hazard.

And further optimizing, the system also comprises a signal processing system, the signal receiver feeds back information to the signal processing system, the signal processing system feeds back the information to the control system, and the control system suspends the work of the special machine and adjusts the rotating speed of one servo motor. When the signal receiver cannot receive the signal transmitted by the signal transmitter, the signal receiver feeds back the signal to the signal processing system, the signal processing system feeds back information to the control system, and the control system suspends the work of the special machine and adjusts the rotating speed of one servo motor so as to adjust the height of the spindle box, so that the spindle boxes can return to the unified height again, and the spindle boxes can reach a processing area at the same time.

Further optimization, the number of the spindle boxes is two, the number of the front spindle bases is two, and the number of the rear spindle bases is two. The four main shafts can simultaneously process four workpieces, and the processing efficiency is high.

Preferably, the front spindle seat or the rear spindle seat is provided with three signal transmitters, the front spindle seat or the rear spindle seat opposite to the other side of the sliding seat is provided with three signal receivers, and when at least two signal receivers receive signals sent by the corresponding signal transmitters, the operation is normally performed. In order to avoid short-term failure of the signal receivers, when 2 or more signal receivers can normally receive signals, it indicates that a plurality of headstocks are still at the same height, and it may be that one of the signal receivers is blocked by the beam or the signal receiver has short-term failure.

Further preferably, the front spindle and the rear spindle on the spindle box are respectively provided with two signal transmitters, the front spindle and the rear spindle opposite to the other side of the sliding seat are respectively provided with two signal receivers, and when at least three signal receivers receive signals sent by the corresponding signal transmitters, the operation is normally carried out. In order to avoid short-term failure of the signal receivers, when 3 or more signal receivers can normally receive signals, it is indicated that a plurality of headstocks are still at the same height, and it may be that one of the signal receivers is blocked by the beam or that the signal receiver has short-term failure.

Further optimize, sliding connection has four to be used for placing the thing platform of putting of work piece on the workstation, four put the thing platform and be the rectangle array mode and arrange. A headstock drives two main shafts and moves simultaneously, and headstock respectively of slide structure both sides wall, every headstock are driven by a servo motor, utilizes ripe motor with moving technology to guarantee that four main shafts are simultaneously to four work pieces of putting on the thing platform and process, and machining efficiency is high.

Further optimize, be equipped with the recess in putting the thing platform, be equipped with the cavity in putting the thing platform, install the anchor clamps pole in the cavity, the anchor clamps pole runs through puts the thing platform inner wall, the one end that the anchor clamps pole stretches out puts the thing platform inner wall is connected with the arc grip block. When a workpiece is required to be clamped, the workpiece is placed in the groove of the object placing table, and then the clamp rod is extended, so that the arc-shaped clamping plate clamps the workpiece, and the workpiece is not easy to slip in the machining process.

Further preferably, the front main shaft or the rear main shaft is an electric main shaft, the rotating speed of the electric main shaft is 18000r/min during working, and a bearing is mounted on the electric main shaft. The bearing plays a role in supporting the main shaft, the electric main shaft rotates to drive the cutter below the electric main shaft to rotate, and the cutter finishes processing the object.

Further optimize, columniform pole setting is installed respectively to the slide both sides, be equipped with the arc buckle that is used for the sliding fit pole setting on the headstock.

Further preferably, the upright post is of a herringbone structure, and the center of gravity of the upright post is located at a position below the upright post. The design of the herringbone structure ensures the rigidity and the supporting force of the upright post, and ensures that the gravity center is at the position which is lower than the upright post, so that the machine tool is more stable.

Drawings

FIG. 1 is a side view of the high precision four spindle machining center machine of the present invention;

FIG. 2 is a front view of the high-precision four-spindle machining center special machine of the present invention;

FIG. 3 is a schematic structural view of the present invention with the mounting surface of the spindle box facing upward;

FIG. 4 is a schematic view of the structure of the present invention with the spindle box installed facing downward;

fig. 5 is a schematic structural view of a cross beam in the present invention;

fig. 6 is a schematic structural diagram of the slide carriage of the present invention;

fig. 7 is a front view of the present invention including a tool changing mechanism;

fig. 8 is a schematic structural view of a spindle base according to the present invention;

fig. 9 is a schematic view of the inside of a cross beam in the present invention;

fig. 10 is a functional relationship diagram of the signal transmitter, the signal receiver, the signal processing system and the control system in the present invention;

fig. 11 is a schematic view of the spindle head when the spindle base of the present invention is rotated;

fig. 12 is a schematic view of the relationship between the motor with double output shafts and the spindle base.

Reference numerals: the device comprises a base 1, an upper top plate 101, a bottom plate 102, a stand column 2, a cross beam 3, a workbench 4, a sliding seat 5, a spindle box 6, a different-edge double-output-shaft motor 7, a spindle seat 8, a front spindle seat 81, a rear spindle seat 82, a spindle 9, a signal transmitter 10, a signal receiver 11, a flange 12, an air outlet hole 13, a ventilation channel 14, a sliding block 15, an elastic hose 16, an opening 17, an air storage tank 18, an air supply pipe 19, a hub 20, an air distribution pipe 21, an air curtain nozzle 22, a chip discharge groove 23, a chip discharge screw 24, a cutter 25, a guide rail 26, an inverted U-shaped port 27, a sliding block 28, a pulley 29, a storage table 30, a transmission groove 31, a screw rod 32, a stepped notch 33, a cutter changing mechanism 34, a cutter head 341, a balance piece 35.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

The embodiment of the utility model is shown in figures 1-12: a high-precision four-spindle machining center special machine comprises a base 1, an upper top plate 101, a bottom plate 102, a stand column 2 connected to the base 1, a cross beam 3 crossing the base 1 and arranged on the stand column 2, a workbench 4 reciprocating along the X-axis direction and arranged on the base 1 in a sliding manner, the workbench 4 positioned below the cross beam 3, a sliding seat 5 reciprocating along the Y-axis direction and arranged on the cross beam 3 in a sliding manner, spindle boxes 6 reciprocating along the Z-axis direction and arranged on two sides of each sliding seat 5, a different-edge double-output-shaft motor 7 arranged in each spindle box 6, two output shafts of each different-edge double-output-shaft motor 7 penetrating through the side wall of each spindle box 6, spindle seats 8 respectively connected to one side of each different-edge double-output-shaft motor 7 extending out of the side wall of each spindle box 6, spindles 9 capable of rotating relative to each spindle 5 under the action of each different-edge double, the two spindles 9 are symmetrically arranged along the central axis of the spindle box 6, and spindle seats 8 positioned at the front and rear positions of the spindle box 6 are a front spindle seat 81 and a rear spindle seat 82; the main spindle box 6 is also internally provided with a control system for controlling a servo motor and the spindle 9, a signal emitter 10 is arranged on the front spindle seat 81 or the rear spindle seat 82, a signal receiver 11 matched with the signal emitter 10 is arranged on the front spindle seat 81 or the rear spindle seat 82 opposite to the other side of the sliding seat 5, the signal receiver 11 always receives the signal of the signal emitter 10 during working, and when the signal receiver 11 does not receive the signal, the special machine stops working.

The control system is used for stopping the work of the special machine and adjusting the rotating speed of one servo motor.

The number of the spindle heads 6 is two, the number of the front spindle bases 81 is two, and the number of the rear spindle bases 82 is two.

Three signal transmitters 10 are mounted on one of the front spindle seat 81 or the rear spindle seat 82, three signal receivers 11 are mounted on the front spindle seat 81 or the rear spindle seat 82 opposite to the other side of the sliding seat, and when at least two signal receivers 11 receive signals transmitted by the corresponding signal transmitters 10, the operation is normally performed.

The bottom end face of the main shaft 9 is connected with a flange 12, the flange 12 is provided with an air outlet hole 13, a ventilation channel 14 is arranged in the main shaft 9, and the ventilation channel 14 is arranged opposite to the air outlet hole 13 on the flange 12; the air curtain device is characterized by further comprising an external air source, a slide is arranged on the upper top plate 101, a sliding block 15 is connected in the slide in a sliding mode along the Y-axis direction, the external air source is connected with an elastic hose 16, the elastic hose 16 penetrates through the sliding block 15 and is communicated with an air passage 14 in the main shaft 9, an inner cavity is arranged in the cross beam 3, an air curtain generating mechanism is arranged in the inner cavity, and a plurality of openings 17 which are arranged in a close fit mode are formed in.

The air curtain generating mechanism comprises an air storage tank 18 and an air supply pipe 19, wherein an air source is contained in the air storage tank 18, the air storage tank 18 is connected with the air supply pipe 19, the tail end of the air supply pipe 19 is connected with an air distribution pipe 21, a plurality of air curtain nozzles 22 are arranged on the air distribution pipe 21, and the air curtain nozzles 22 are arranged in one-to-one correspondence with openings 17 in the side wall of the cross beam 3.

The external air source and the air source contained in the air storage tank 18 are nitrogen gas or air. Valves for controlling the circulation of the air source are arranged on the external air source and the air storage tank 18. The sliding speed of the slide block 15 on the upper top plate 101 is consistent with the sliding speed of the slide carriage 5 on the cross beam 3. The cross-sectional area of the gas curtain nozzle 22 is one of square, circular, and triangular.

Chip removal grooves 23 are formed in two inner walls of the upper side of the base 1, chip removal screws 24 are arranged in the chip removal grooves 23, and the chip removal screws 24 are connected with chip removal motors.

The cross section of the spindle box 6 is in a kidney-shaped shape, the spindle box 6 is tightly connected to the sliding seat 5 in a sliding mode, the distance between the spindle box 6 and the sliding seat 5 is close to zero, a servo motor for driving the spindle box 6 to reciprocate along the Z-axis direction is installed in the spindle box 6, and detachable tools 25 are installed at the bottom end of the spindle 9.

Two sides of the upright post 2 are respectively provided with a group of tool changing mechanisms 34, each tool changing mechanism 34 comprises a tool changing disc 341, the tool changing discs 341 are connected with a motor for rotating the tool changing discs 341, a plurality of tool changing grooves which are uniformly distributed along the circumference are arranged on the tool changing discs 341, and different types of tools 25 are detachably connected in the tool changing grooves; the main shaft 9 is internally provided with a cutter 25 automatic tensioning mechanism, and the cutter 25 automatic tensioning mechanism is controlled by a two-position four-way electromagnetic valve.

A balance groove is arranged in the center of the upper side of the sliding seat 5, a balance piece 35 is arranged in the balance groove, and the balance piece 35 is a U-shaped balance piece 35.

The upper side of the slide carriage 5 is provided with a support 36 on each side, the support 36 is a "U" shaped support 36, and the support 36 is used for abutting against one side of the headstock 6 close to the slide carriage 5.

Crossbeam 3 is the arch, and the central angle that the circular arc that the arch belongs to corresponds is 22.675, and fixed mounting has guide rail 26 on the crossbeam 3, and guide rail 26 quantity is four, and crossbeam 3 top is provided with two guide rails 26, and two sides of crossbeam 3 are provided with a pair of guide rail 26 relatively, and slide 5 is the type of falling U, is equipped with the type of falling U mouth that supplies crossbeam 3 to pass on the slide 5, the type of falling U mouth and the crossbeam 3 block of slide 5.

Four sliding blocks 28 which are respectively clamped with the four guide rails 26 are fixedly arranged on the sliding seat 5, and the inverted U-shaped opening of the sliding seat 5 covers the cross beam 3 and is supported by the four sliding blocks 28. The slider 28 is "concave" in cross-section and the rail 26 is "convex" in cross-section.

The bottom plate 102 is provided with a slide way, the bottom of the base 1 is provided with a pulley 29, and the pulley 29 is connected in the slide way in a sliding way. The base plate 102 is slidably connected to the base 1, and the base 1 can reciprocate along the X-axis direction. The bottom of the spindle base 8 is provided with a hole for the tool 25 to pass through.

The upright post 2 is of a herringbone structure, and the gravity center of the upright post 2 is positioned at the position below the upright post 2.

Four article placing tables 30 used for placing workpieces are connected to the workbench 4 in a sliding mode, and the four article placing tables 30 are arranged in a rectangular array mode.

A transmission groove 31 is arranged in the center of the upper side of the cross beam 3, a screw rod 32 is arranged in the transmission groove 31, the screw rod 32 is connected with an output motor, and the screw rod 32 drives the sliding seat 5 to reciprocate along the Y-axis direction.

Two opposite step notches 33 are arranged in the inverted U-shaped opening of the sliding seat 5, the two step notches 33 are symmetrically arranged along the central axis of the sliding seat 5, and the two guide rails 26 arranged on the side surfaces of the cross beam 3 are positioned in the step notches 33.

The main shaft 9 is an electric main shaft 9, the rotating speed of the electric main shaft 9 is 18000r/min when the electric main shaft 9 works, and a bearing is arranged on the electric main shaft 9.

The main spindle box 6 is also provided with a plurality of lightening holes 37. Cylindrical vertical rods are respectively arranged on two sides of the sliding seat 5, and an arc-shaped buckle 38 which is in sliding fit with the vertical rods is arranged on the spindle box 6.

A groove is formed in the object placing table 30, a cavity is formed in the object placing table 30, a clamp rod is installed in the cavity and penetrates through the inner wall of the object placing table 30, and an arc-shaped clamping plate is connected to one end, extending out of the inner wall of the object placing table 30, of the clamp rod.

The angle range of the spindle 9 rotating relative to the slide 5 is 0-15 deg..

The utility model discloses a concrete operating procedure as follows: in the utility model, the sliding of the worktable 4, the sliding seat 5 and the main spindle box 6 is all completed by numerical control technology, the utility model can process four wheel hubs 20 at one time, the processing efficiency is high,

before machining, the cutter grabbing work is carried out, the sliding seat 5 moves to the position above the cutter changing disc 341 along the Y-axis positive half shaft, the spindle box 6 also moves to the position above the cutter changing disc 341 along with the sliding seat 5, then the spindle box 6 moves downwards along the Z-negative half shaft to reach the cutter position of the cutter 25, after the cutter is grabbed by the automatic tensioning mechanism of the cutter 25, the cutter moves upwards along the Z-positive half shaft, and then the cutter moves transversely along the Y-negative half shaft to return to the initial position.

Then place four wheel hubs 20 respectively in four recesses of putting in the thing platform 30, then extend the anchor clamps pole, make the arc grip block centre gripping wheel hub 20, be convenient for wheel hub 20 phenomenon such as the difficult production of skidding in the course of working.

Firstly, sliding the workbench 4 along the X-axis direction to enable the hub 20 in the object placing table 30 on the workbench 4 to slide to a proper processing position, then stopping sliding the workbench 4, secondly sliding the sliding seat 5 to enable the sliding seat 5 to slide along the Y-axis direction, finally enabling the four spindles 9 to be respectively positioned above the four hubs 20, then simultaneously starting the servo motors in the two spindle boxes 6 to enable the two servo motors to simultaneously drive the spindle boxes 6 to move along the Z-axis direction, enabling the spindles 9 and the tools 25 to move along with the spindle boxes 6 until the bottoms of the tools 25 touch the upper surface of the hubs 20, and then enabling the spindles 9 to rotate to enable the tools 25 to process the hubs 20.

In the processing process, the beam 3 is the arched beam 3, the central angle corresponding to the arc where the arch is located is 22.675 degrees, and the arched beam 3 can ensure that the stress is more stable in the processing process. Because the spindle box 6 is tightly connected with the sliding seat 5, the distance between the spindle box 6 and the sliding seat 5 approaches to zero, the vibration cannot occur in the machining process, and the condition that the stress of a workpiece is unstable in the machining process cannot occur.

The base 1 can slide on the bottom plate 102, when the hub 20 on the workbench 4 slides to the processing position, if the centers of gravity of the hub 20 and the workbench 4 are all located at one side of the special machine, one side of the special machine is stressed greatly, the other side of the special machine is stressed less, and the balance during processing can be damaged, so that the base 1 is required to slide to the side with less stress to balance the stress at two sides of the special machine, and the processing process generates relative balance.

The corresponding signal emitter 10 and the corresponding signal receiver 11 are at the same height in the initial state, and in the process that the front main shaft 9 and the rear main shaft 9 move towards the Z-axis direction, wherein, three signal transmitters 10 on one front spindle seat always transmit signals, when all the spindle boxes 6 are at the same height, the three signal receivers 11 on the other front spindle base can always receive the signals transmitted by the signal transmitter 10, however, when one of the headstocks 6 is at a different height from the other headstock 6, the signal receiver 11 does not receive the signal, the signal receiver 11 feeds back to the control system, the control system can firstly pause the movement of the headstocks 6, then the rotating speed of a servo motor where one spindle box 6 is positioned is adjusted to ensure that the two spindle boxes 6 reach the same height again, the two headstocks 6 can then be moved synchronously, facilitating simultaneous machining of a plurality of hubs 20 by a plurality of tools 25. In order to avoid short-term failure of the signal receivers 11, when two or more signal receivers 11 can normally receive signals, it is indicated that the multiple headstocks 6 are still at the same height, and it may be that one of the signal receivers 11 is blocked by the cross beam 3 or that the signal receiver 11 has short-term failure.

In the sliding process of the sliding seat 5 along the Y-axis direction, the sliding block 15 also synchronously slides on the upper top plate 101, an air source in an external air source enters the air channel 14 of the spindle 9 through the elastic hose 16, the air flows out from the air channel 14 in the spindle 9 to the air outlet 13 on the flange plate 12, the air forms a longitudinal air curtain through the air outlet 13 to preliminarily clean the surface of the cutter 25 and the surface of the workbench 4, and the longitudinal air curtain can clean the chips on the cutter 25 and the workbench 4 in real time in the machining process. The air curtain cleans the chips on the cutter 25 and the chips on the worktable 4 in real time during the processing. Gas generated by a gas source in a gas storage tank 18 in the cross beam 3 flows into a gas distribution pipe 21 through a gas supply pipe 19 in the machining process, the gas in the gas distribution pipe 21 is sprayed out through a gas curtain nozzle 22, and the gas forms a transverse gas curtain through an opening 17 in the side wall of the cross beam 3, so that chips generated in the machining process are covered by the transverse gas curtain and a longitudinal gas curtain, and the chips cannot splash everywhere.

When the hub 20 needs to be tilted and the upper surface of the hub 20 needs to be machined, the servo motor is stopped to enable the spindle box 6 not to move along the Z-axis direction, then the different-edge double-output-shaft motor 7 is started, the different-edge double-output-shaft motor 7 rotates simultaneously through two output shafts to drive the spindle seat 8 to rotate by taking the side wall of the sliding seat 5 as a rotation center, the spindle seat 8 rotates to a proper position to enable the cutter 25 to slightly tilt to the surface of the hub 20, then the different-edge double-output-shaft motor 7 is closed, the servo motor is started again simultaneously to enable the spindle box 6 to move along the Z-axis direction, the spindle seat 8 and the spindle 9 are inclined to the surface of the hub 20 and follow the spindle box 6 to move along the Z-axis direction, meanwhile, the spindle 9 rotates to drive the cutter 25 to rotate, and machining.

In the machining process, the chip removal motor always works, and the chip removal motor rotates to drive the chip removal screw 24 to clean up chips accumulated in the chip removal groove 23. The symmetrical installation mode of the spindle box 6 and the symmetrical design mode of the spindle 9 are adopted, and other parts of the special machine are basically in the symmetrical design mode, so that the stress on two sides of the special machine is almost equal when the four cutters 25 simultaneously machine the hub 20, and the machining stability is ensured.

Example 2 as shown in fig. 1 to 12: different from the embodiment 1, the front main shaft and the rear main shaft on one main shaft box are respectively provided with two signal transmitters, the front main shaft and the rear main shaft opposite to the other side of the sliding seat are respectively provided with two signal receivers, and when at least three signal receivers receive signals sent by the corresponding signal transmitters, the operation is normally carried out.

The principle differs from embodiment 1 in that: the corresponding signal transmitters 10 and signal receivers 11 are in the same height in the initial state, in the process that the front spindle 9 and the rear spindle 9 move towards the Z-axis direction, two signal transmitters 10 are respectively arranged on one front spindle seat and one rear spindle seat, the four signal transmitters 10 can always transmit signals, when all the spindle boxes 6 are in the same height, two signal receivers 11 respectively arranged on the other front spindle seat and the other rear spindle seat can always receive the signals, when one spindle box 6 and the other spindle box 6 are in different heights, the signal receivers 11 cannot receive the signals, the signal receivers 11 can feed back to a control system, the control system can firstly pause the movement of the spindle boxes 6, then adjust the rotating speed of a servo motor located in the one spindle box 6 to enable the two spindle boxes 6 to reach the same height again, the two headstocks 6 can then be moved synchronously, facilitating simultaneous machining of a plurality of hubs 20 by a plurality of tools 25. In order to avoid short-term failure of the signal receivers 11, when three or more signal receivers 11 can normally receive signals, it is indicated that the two headstocks 6 are still at the same height, and it may be that one of the signal receivers 11 is blocked by the cross beam 3 or that the signal receiver 11 has short-term failure.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a four main shaft machining center special planes of high accuracy, includes the base, its characterized in that: the automatic cutting machine is characterized in that a stand column is fixedly connected to the base, a cross beam stretching across the base is arranged on the stand column, a workbench which reciprocates along the X-axis direction is arranged on the base in a sliding mode, the workbench is located below the cross beam, a sliding seat which reciprocates along the Y-axis direction is arranged on the cross beam in a sliding mode, at least one pair of spindle boxes which reciprocate along the Z-axis direction are arranged on two sides of the sliding seat oppositely, a servo motor which drives the spindle boxes to reciprocate along the Z-axis direction is arranged in each spindle box, each spindle box comprises a plurality of spindle seats, intervals between every two adjacent spindle seats are uniform, spindles are arranged in the spindle seats, detachable cutters are arranged at the bottoms of the spindles, and the spindle seats located in the front and the rear of; the spindle box is internally provided with a control system for controlling the servo motor and the spindle, a signal emitter is arranged on the front spindle seat or the rear spindle seat, a signal receiver matched with the signal emitter is arranged on the front spindle seat or the rear spindle seat opposite to the other side of the sliding seat, the signal receiver always receives a signal of the corresponding signal emitter during working, and the working is suspended when the signal receiver does not receive the signal.

2. The high-precision four-spindle machining center special machine according to claim 1, characterized in that: the control system suspends the work of the special machine and adjusts the rotating speed of one of the servo motors.

3. The high-precision four-spindle machining center special machine according to claim 2, characterized in that: the number of the spindle boxes is two, the number of the front spindle bases is two, and the number of the rear spindle bases is two.

4. The high-precision four-spindle machining center special machine according to claim 3, characterized in that: and when at least two signal receivers receive signals sent by the corresponding signal transmitters, the operation is normally carried out.

5. The high-precision four-spindle machining center special machine according to claim 3, characterized in that: the front main shaft and the rear main shaft on one main shaft box are respectively provided with two signal transmitters, the front main shaft and the rear main shaft opposite to the other side of the sliding seat are respectively provided with two signal receivers, and when at least three signal receivers receive signals sent by the corresponding signal transmitters, the work is normally carried out.

6. The high-precision four-spindle machining center special machine according to claim 1, characterized in that: the four article placing tables used for placing the workpieces are connected to the workbench in a sliding mode and are arranged in a rectangular array mode.

7. The high-precision four-spindle machining center special machine according to claim 6, characterized in that: the article placing table is internally provided with a groove, the article placing table is internally provided with a cavity, the cavity is internally provided with a clamp rod, the clamp rod penetrates through the inner wall of the article placing table, and one end of the clamp rod, which extends out of the inner wall of the article placing table, is connected with an arc-shaped clamping plate.

8. The high-precision four-spindle machining center special machine according to claim 1, characterized in that: the front main shaft or the rear main shaft is an electric main shaft, the rotating speed of the electric main shaft is 18000r/min during working, and a bearing is mounted on the electric main shaft.

9. The high-precision four-spindle machining center special machine according to claim 1, characterized in that: cylindrical vertical rods are respectively installed on two sides of the sliding seat, and arc-shaped buckles used for being in sliding fit with the vertical rods are arranged on the spindle box.

10. The high-precision four-spindle machining center special machine according to claim 1, characterized in that: the upright post is of a herringbone structure, and the gravity center of the upright post is located at a position below the upright post.