CN209887095U

CN209887095U - Cross beam stabilizing structure of four-spindle machining center

Info

Publication number: CN209887095U
Application number: CN201920228520.6U
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: 2020-01-03
Anticipated expiration: 2029-02-21

Abstract

The utility model discloses a machining equipment technical field specifically is a crossbeam stable structure of four main shaft machining centers, the on-line screen storage device comprises a base, fixedly connected with stand on the base, be provided with the crossbeam that spanes the base on the stand, slidable mounting has the workstation along X axle direction reciprocating motion on the base, the workstation is located the below of crossbeam, slidable mounting has the slide along Y axle direction reciprocating motion on the crossbeam, the crossbeam is the arch, fixed mounting has the guide rail on the crossbeam, guide rail quantity is 3 at least, the crossbeam top is provided with a guide rail at least, two sides of crossbeam are provided with an at least pair of guide rail relatively, the slide is the type of falling U, the type of falling U mouth and the crossbeam block of slide. The arched beam design mode is adopted to ensure that the stress of a workpiece from the spindle box is more stable in the machining process, the arched beam design reduces the weight of the beam, the cost is saved, and the machine tool base is more stable and not easy to deform due to the reduction of the weight of the beam.

Description

Cross beam stabilizing structure of four-spindle machining center

Technical Field

The utility model relates to a machining equipment technical field specifically is a four main shaft machining center's crossbeam stable structure.

Background

At present, a multi-axis numerical control machine tool refers to X, Y, Z direction movement axes, rotation of workpieces and the like, and has a plurality of independent main shafts, each independent main shaft is provided with an independent control system, and a plurality of workpieces can be machined by clamping each time, but the plurality of main shafts are often arranged on one side, so that only single-side machining can be carried out on the workpieces, the machining precision cannot be guaranteed, only rough machining can be carried out on the workpieces, and finish machining cannot be carried out on the workpieces.

The crossbeam in the existing multi-axis numerical control machine tool is one of important parts forming the machine tool and is also the basis of the movement of the direction movement axis of the machine tool Y, Z, therefore, the structural reasonability of the crossbeam is one of important conditions for ensuring the precision, stability and durability of the machine tool and the rigidity of the whole machine tool.

The existing machine tool head is usually mounted on the beam through a sliding seat, and the weight of the machine tool head and the sliding seat and the moving support of the machine tool head and the sliding seat are all stressed by considering the front surface of the beam. Because the installation parts arranged at the upper end and the lower end of the front surface of the traditional beam are arranged in the same straight line in the vertical direction, the front surface casting of the beam is thickened and the ribs and bones are encrypted by the traditional beam, so that the rigidity is ensured, but the weight of the beam is also increased, and the cost is improved. And because of the weight reason of crossbeam lead to the deflection of lathe base also can increase, the retentivity of precision is relatively poor, can appear the unstable condition of atress during messenger's processing.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a crossbeam stable structure of four main shaft machining centers, solves among the prior art retentivity of precision relatively poor in the course of working, can appear the unstable problem of atress.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a cross beam stabilizing structure of a four-spindle machining center 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 slidably mounted on the base, the workbench is positioned below the cross beam, a sliding seat capable of reciprocating along the Y-axis direction is slidably mounted on the cross beam, a plurality of spindle boxes capable of reciprocating along the Z-axis direction are mounted on two sides of the sliding seat, the cross beam is arched, a central angle corresponding to an arc where the arch is located is 20-40 degrees, guide rails are fixedly mounted on the cross beam, the number of the guide rails is at least 3, at least one guide rail is arranged at the top of the cross beam, at least one pair of guide rails is oppositely arranged on two side surfaces of the cross beam, the sliding seat is inverted U-shaped, and an inverted U-shaped opening for, and the inverted U-shaped opening of the sliding seat is clamped with the cross beam.

The principle of the utility model is as follows: the workpiece to be processed is placed on the workbench, the workbench is firstly slid along the X-axis direction, the workpiece on the workbench penetrates through the lower portion of the arched cross beam, the workpiece on the workbench is located at a proper processing position, then the sliding of the workbench is stopped, then the sliding seat is slid along the Y-axis direction, the sliding seat slides along the guide rail on the cross beam, the spindle box is located above the workpiece, then a cutter below the spindle box processes the workpiece, the processing of the workpiece is completed, in the processing process, as the cross section of the bottom of the cross beam is arched, the central angle corresponding to the arc where the arch is located is 20-40 degrees, and the arched cross beam can guarantee that the stress is more stable in processing.

The utility model has the advantages that: 1. the arched beam design mode is adopted to ensure that the stress of a workpiece from the spindle box is more stable in the machining process, the arched beam design reduces the weight of the beam, the cost is saved, and the machine tool base is more stable and not easy to deform due to the reduction of the weight of the beam. 2. Set up 3 at least guide rails on the crossbeam, the upper surface of crossbeam sets up a guide rail at least, and two sides of crossbeam are provided with at least a pair of guide rail relatively, and the left surface of crossbeam sets up a guide rail at least promptly, and the right surface of crossbeam sets up a guide rail at least, and the crossbeam support technique that adopts trilateral three at least guide rails of crossbeam to arrange can support whole slide, and the supporting effect is good, has guaranteed the stability of the slide when sliding and the stability of machine tool atress during processing. 3. The slide design of the type of falling U mouth, with the crossbeam block of mutually supporting, guarantee the slide stability when the slide.

Further preferably, the number of the guide rails is four, two guide rails which are symmetrical along the central axis of the cross beam are arranged at the top of the cross beam, and one guide rail is arranged on each of two side surfaces of the cross beam. The guide rails are four, wherein the upper surface of the cross beam is provided with two guide rails which are symmetrical along the central axis of the cross beam, so that the stress of the sliding seat is balanced, the spindle boxes on two sides of the sliding seat are balanced in stress, the left surface and the right surface of the cross beam are respectively provided with one guide rail, the left surface and the right surface of the cross beam are conveniently clamped with the inverted U-shaped opening of the sliding seat, and the sliding stability of the sliding seat is facilitated. The cross beam supporting technology adopting the arrangement of the three sides and the four sides of the cross beam can support the whole sliding seat, the supporting effect is good, the minimum number of the guide rails is adopted, the production cost is reduced, and the effect of supporting the whole sliding seat is achieved.

Further preferably, four sliding blocks which are respectively clamped with the four guide rails are fixedly installed on the sliding seat, and the inverted U-shaped opening of the sliding seat covers the cross beam and is supported by the four sliding blocks. The guide rail is matched with the sliding blocks on the sliding seat in a clamping manner, so that the beam supports the whole sliding seat through the four sliding blocks.

Further preferably, the cross section of the sliding block is concave, and the cross section of the guide rail is convex. The sliding block is tightly attached to the guide rail, and no gap exists between the sliding block and the guide rail.

Further optimize, the quantity of headstock is two, install the servo motor that drives headstock along Z axle direction reciprocating motion in the headstock, install the main shaft of two symmetries on the headstock, detachable cutter is all installed to the main shaft bottom. The starting servo motor drives the spindle box to move along the Z-axis direction, the cutter also moves along with the spindle box, the workpiece is processed through the cutter, the cutter can be detachably connected, different types of cutters can be conveniently replaced, and the machine tool is suitable for different types of machining.

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.

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, the centre of crossbeam upside is provided with the transmission recess, be provided with the lead screw in the transmission recess, the lead screw is connected with output motor, the lead screw drive the slide is along Y axle direction reciprocating motion. The output motor drives the lead screw to rotate, and the lead screw drives the sliding seat to reciprocate along the Y-axis direction, so that the sliding seat moves to a proper machining position.

Further optimize, be equipped with two relative ladder notches, two in the type of falling U mouth of slide the ladder notch sets up, two along slide axis symmetry the guide rail that sets up to the side of the crossbeam is located the ladder notch. The ladder notch is convenient for save material in the manufacturing process to and cooperate with two guide rails of side, make the slide in-process atress more stable.

Further preferably, the central angle of the arc of the arch is 22.675 °. When the central angle corresponding to the arc where the arch is located is the angle, the cost performance of the cross beam is the highest, namely the cost of the cross beam and the stability of the machine tool are most suitable for processing and production.

Drawings

Fig. 1 is an axial side view of a cross beam stabilizing structure of a four spindle machining center of the present invention;

fig. 2 is a front view of a cross beam stabilizing structure of a four spindle machining center 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 1 of the utility model is as shown in figures 1-12: a cross beam stabilizing structure of a four-spindle machining center comprises a base 1, an upper top plate 101, a bottom plate 102, a vertical column 2 connected to the base 1, a cross beam 3 crossing the base 1 and arranged on the vertical 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 the sliding seat 5 respectively, a different-edge double-output-shaft motor 7 arranged in the spindle boxes 6, two output shafts of the different-edge double-output-shaft motor 7 both penetrating through the side wall of the spindle boxes 6, spindle seats 8 respectively connected to one side of the two output shafts of the different-edge double-output-shaft motor 7 extending out of the side wall of the spindle boxes 6, a spindle 9 capable of rotating relative to the spindle 5 under, 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's crossbeam stable structure, includes the base, its characterized in that: fixedly connected with stand on the base, be provided with on the stand and span the crossbeam of base, slidable mounting has the workstation along X axle direction reciprocating motion on the base, the workstation is located the below of crossbeam, slidable mounting has the slide along Y axle direction reciprocating motion on the crossbeam, a plurality of headstocks along Z axle direction reciprocating motion are installed to the slide both sides, the crossbeam is the arch, the central angle that the circular arc that the arch place corresponds is 20 ~ 40, fixed mounting has the guide rail on the crossbeam, guide rail quantity is 3 at least, the crossbeam top is provided with a guide rail at least, two sides of crossbeam are provided with at least a pair of guide rail relatively, the slide is the type of falling U, be equipped with the type of falling U mouth that supplies the crossbeam to pass on the slide, the type of falling U mouth of slide with the crossbeam block.

2. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: the number of the guide rails is four, two guide rails which are symmetrical along the central axis of the cross beam are arranged at the top of the cross beam, and one guide rail is arranged on each of two side surfaces of the cross beam.

3. The cross beam stabilizing structure of the four-spindle machining center according to claim 2, wherein: four sliding blocks which are respectively clamped with the four guide rails are fixedly arranged on the sliding seat, and the inverted U-shaped opening of the sliding seat covers the cross beam and is supported by the four sliding blocks.

4. The cross beam stabilizing structure of a four-spindle machining center according to claim 3, wherein: the cross section of the sliding block is concave, and the cross section of the guide rail is convex.

5. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: the Z-axis reciprocating type cutting machine is characterized in that a servo motor for driving the spindle box to reciprocate in the Z-axis direction is installed in the spindle box, two symmetrical spindles are installed on the spindle box, and detachable cutters are installed at the bottom ends of the spindles.

6. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: 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.

7. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: 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.

8. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: the transmission groove is arranged in the center of the upper side of the cross beam, a screw rod is arranged in the transmission groove and connected with an output motor, and the screw rod drives the sliding seat to reciprocate along the Y-axis direction.

9. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: be equipped with two relative ladder notches in the type of falling U mouth of slide, two ladder notch sets up along slide axis symmetry, two the guide rail that sets up to the side of the crossbeam is located the ladder notch.

10. The cross beam stabilizing structure of the four-spindle machining center according to claim 1, wherein: the central angle corresponding to the arc of the arch is 22.675 degrees.