A multi-axis CNC machining equipment with preload function

Abstract

This invention relates to the field of CNC machine tool component technology, specifically to a multi-axis CNC machining equipment with preload function. The equipment includes a Z-axis machining component positioned above the multi-axis CNC machining equipment, a Y-axis moving component positioned in front of the multi-axis CNC machining equipment, and an X-axis moving preload component positioned above the Y-axis moving component. The beneficial effects are: by mounting the X-axis moving preload component on the Y-axis moving component, the first moving worktable moves, thereby driving the second moving worktable to translate in the X-axis direction of the machine tool. The pressure sensing device feeds back the actual X-axis force value until it matches the system's preset force value. At this point, the system sends a command to brake and engage the X-axis servo motor, achieving a constant preload force on the workpiece from the turntable. This is applicable to various workpiece machining applications, prevents workpiece deformation, and improves machining stability and accuracy.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool component technology, specifically to a multi-axis CNC machining equipment with preload function. Background Technology

[0002] Multi-axis CNC machining equipment is a crucial type of equipment in modern manufacturing. It enables precise machining simultaneously along multiple axes, significantly improving processing efficiency and accuracy. Multi-axis CNC machining equipment typically includes three-axis, four-axis, five-axis, or even more axis configurations, suitable for machining workpieces with complex shapes and high precision requirements. To better suit the needs of fully automated production, a certain preload is required during clamping when machining parts with complex curved surfaces to ensure machining accuracy. Currently, existing equipment cannot achieve fully automated workpiece clamping; workpieces requiring preload can only be manually adjusted, leading to problems such as workpiece deformation, large machining errors, and low efficiency.

[0003] The existing Chinese patent document with publication number CN119017113A proposes a tooling for machining the end face of a wheel hub bearing. It solves the above-mentioned technical problems by clamping and fixing the outer ring of the wheel hub bearing with a fixing device, and the inner ring of the wheel hub bearing having a center hole, with a centering shaft installed in the center hole. However, it cannot automatically pre-tighten the workpiece during clamping and cannot determine and correct the deflection error in real time.

[0004] Therefore, this invention proposes a multi-axis CNC machining equipment with preload function, which solves the problem that existing CNC machining equipment cannot automatically preload workpieces during clamping. It adopts an X-axis preload component and improves the clamping component, with a pressure sensing device for feedback, a moving worktable for setting preload data, and automatic workpiece deflection correction. It is applicable to the processing of various workpieces, prevents workpiece deformation, and improves processing stability and accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-axis CNC machining equipment with preload function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-axis CNC machining equipment with preload function, comprising a multi-axis CNC machining equipment, a Z-axis machining component disposed above the multi-axis CNC machining equipment, a Y-axis moving component disposed in front of the multi-axis CNC machining equipment, an X-axis moving preload component disposed above the Y-axis moving component, the X-axis moving preload component comprising an X-axis preload axis mounting bracket, a fixed worktable, a first moving worktable and a second moving worktable, a turntable fixedly mounted above both the fixed worktable and the second moving worktable, a workpiece fixing and correction component disposed on one side of the output shaft of the turntable, the workpiece fixing and correction component comprising a workpiece fixing table, a movable seat and a deflection correction disc.

[0007] Preferably, the bottom of the X pretension shaft mounting bracket is fixedly connected to the upper part of the sliding component of the Y-axis moving component by bolts, the fixed worktable is fixedly installed on one side of the upper surface of the X pretension shaft mounting bracket by bolts, the moving worktable is slidably installed on the other side of the upper surface of the X pretension shaft mounting bracket, and a limiting slide rail adapted to the moving worktable is fixedly installed on the upper surface of the X pretension shaft mounting bracket.

[0008] Preferably, the second movable worktable is positioned above the first movable worktable. A threaded sleeve is fixedly installed on the lower surface of the first movable worktable, and a pushing and squeezing sleeve is fixedly installed on the upper surface of the first movable worktable. The upper surface of the second movable worktable is provided with a limiting groove adapted to the pushing and squeezing sleeve. A pressure sensing device mounting plate is fixedly installed inside the groove of the second movable worktable. A pressure sensing device is fixedly installed in the middle of the pressure sensing device mounting plate by bolts. The side wall of the pushing and squeezing sleeve is provided with a groove adapted to the pressure sensing device mounting plate, and the pushing and squeezing sleeve is positioned outside the pressure sensing device.

[0009] Preferably, an X-axis preload screw is rotatably mounted inside the X-axis preload shaft mounting bracket, and an X-axis servo motor for driving the X-axis preload screw to rotate is fixedly mounted inside the X-axis preload shaft mounting bracket on the side near the fixed worktable. The inside of the threaded sleeve is connected to the outer surface of the X-axis preload screw by a thread.

[0010] Preferably, the workpiece fixing table is fixedly installed at one end of the output shaft of the turntable, the movable seat is fixedly installed in the middle of the side surface of the workpiece fixing table, movable blocks are symmetrically slidably installed on both sides inside the movable seat, a bidirectional telescopic rod is fixedly installed in the middle of the interior of the movable seat, the output ends of the bidirectional telescopic rod are respectively fixedly connected to the inner surface of the movable block, and a workpiece fixing clamp is fixedly installed on the outer surface of the movable block by bolts.

[0011] Preferably, a push rod movable groove is provided at the middle of one end of the workpiece fixing clamp, and side push blocks are symmetrically slidably installed on both sides of the push rod movable groove. A pressure sensing device two is fixedly installed on one side surface of the side push block, and a squeezing pad is provided on the outer side of the pressure sensing device two. A spring support sleeve is fixedly installed on the side surface of the squeezing pad, and one end of the spring support sleeve is fixedly connected to the inner surface of the workpiece fixing clamp.

[0012] Preferably, a tapered push rod is slidably installed inside the push rod movable groove, a shaped extrusion pad is fixedly installed at one end of the tapered push rod, and a wedge block adapted to the tapered push rod is fixedly installed on the other side surface of the side push block.

[0013] Preferably, the irregular extrusion pad is symmetrically provided with workpiece side fixing clamps on both sides, the workpiece side fixing clamps are rotatably installed on the inner side of the workpiece fixing clamp, a spring rod is movably installed between the outer surface of the workpiece side fixing clamp and the inner surface of the workpiece fixing clamp, a movable clamping plate is hinged to the inner wall of the workpiece side fixing clamp, and an elastic gasket is fixedly installed between the outer surface of the movable clamping plate and the inner surface of the workpiece side fixing clamp.

[0014] Preferably, the deflection correction disc is fixedly installed on the middle of the side surface of the movable seat by bolts, and a pin fixing seat is fixedly installed on the middle of the side surface of the deflection correction disc. A pin is fixedly installed at one end of the pin fixing seat, and a centering correction claw is symmetrically hinged to the side wall of the pin fixing seat.

[0015] Preferably, a telescopic rod is fixedly installed on one side of the deflection correction disk, a pushing wedge is fixedly installed at the output end of the telescopic rod, a movable wedge is slidably installed in the middle of the movable seat, a limit spring rod is fixedly installed between the inner wall of one end of the movable wedge and the inner surface of the deflection correction disk, and the outer surface of the other end of the movable wedge is in contact with the inner surface of the centering correction claw.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention, by mounting an X-axis pre-tightening component on a Y-axis moving component, moves a first moving worktable, which in turn drives a second moving worktable to translate along the X-axis of the machine tool. A pressure sensing device feeds back the actual force value in the X-direction until it matches the preset force value of the system. At this point, the system sends a command to brake and clamp the X-axis servo motor, achieving a constant pre-tightening force on the workpiece by the turntable. Simultaneously, a workpiece fixing and correction component is mounted at the output end of the turntable to assist in clamping the workpiece and automatically correcting the deflection of the workpiece. This invention is applicable to the processing of various workpieces, prevents workpiece deformation, and improves processing stability and accuracy. It solves the problem that existing CNC machining equipment cannot automatically pre-tighten the workpiece during clamping. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the multi-axis CNC machining equipment of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall side structure of the multi-axis CNC machining equipment of the present invention;

[0020] Figure 3 For the present invention Figure 2 A magnified structural diagram at point A;

[0021] Figure 4 This is a schematic diagram of the overall structure of the X-axis moving pre-tightening component of the present invention;

[0022] Figure 5 This is a schematic diagram of the overall disassembled structure of the X-axis moving pre-tightening component of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the turntable and workpiece fixing and correction component of the present invention after the workpiece is installed;

[0024] Figure 7 This is a schematic diagram of the overall structure of the turntable and workpiece fixing and correction component of the present invention;

[0025] Figure 8 This is a schematic diagram of the overall structure of the workpiece fixing and correction component of the present invention;

[0026] Figure 9 This is a schematic diagram of the overall disassembled structure of the workpiece fixing and correction component of the present invention;

[0027] Figure 10 This is a schematic diagram of the internal structure of the workpiece clamping clamp of the present invention in the workpiece clamping state;

[0028] Figure 11 For the present invention Figure 7 Enlarged structural diagram at point B;

[0029] Figure 12 This is a schematic diagram of the internal structure of the deflection correction disk of the present invention;

[0030] Figure 13 This is a schematic diagram of the deflection correction disk after correction according to the present invention;

[0031] Figure 14 This is a schematic diagram of the deflection correction disk before correction according to the present invention.

[0032] In the diagram: 1. Multi-axis CNC machining equipment; 2. Z-axis machining component; 3. Y-axis moving component; 4. X-axis moving preload component; 41. X-axis preload axis mounting bracket; 411. Limiting slide rail; 42. Fixed worktable; 43. Moving worktable one; 431. Threaded sleeve; 432. Pushing extrusion sleeve; 44. Moving worktable two; 441. Pressure sensor mounting plate; 442. Pressure sensor one; 45. Turntable; 46. X-axis servo motor; 47. X-axis preload screw; 5. Workpiece fixing and correction component; 51. Workpiece fixing table; 52. Movable seat; 521. Bidirectional telescopic rod; 522. 523. Movable block; 5231. Workpiece fixing clamp; 5232. Push rod movable groove; 5233. Spring support sleeve; 5233. Extrusion pad; 5234. Side push block; 5235. Pressure sensing device II; 524. Irregularly shaped extrusion pad; 5241. Conical push rod; 525. Workpiece side fixing clamp; 5251. Spring pull rod; 5252. Movable clamping plate; 5253. Elastic gasket; 53. Deflection correction disc; 531. Ejector pin fixing seat; 5311. Centering correction claw; 532. Ejector pin; 533. Telescopic rod; 534. Pushing inclined block; 535. Movable wedge block; 5351. Limiting spring rod. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1, please refer to Figure 1 - Figure 14This invention provides a technical solution: a multi-axis CNC machining equipment with preload function, comprising a multi-axis CNC machining equipment 1, a Z-axis machining component 2 disposed above the multi-axis CNC machining equipment 1, a Y-axis moving component 3 disposed in front of the multi-axis CNC machining equipment 1, and an X-axis moving preload component 4 disposed above the Y-axis moving component 3. The X-axis moving preload component 4 includes an X-axis preload axis mounting bracket 41, a fixed worktable 42, a first moving worktable 43, and a second moving worktable 44. The fixed worktable 42 and the second moving worktable 44 are located above... A turntable 45 is fixedly installed on each of the components. A workpiece fixing and correction component 5 is provided on one side of the output shaft of the turntable 45. The workpiece fixing and correction component 5 includes a workpiece fixing table 51, a movable seat 52, and a deflection correction disc 53. The bottom of the X-axis preload shaft mounting bracket 41 is fixedly connected to the top of the sliding component of the Y-axis moving component 3 by bolts. The fixed worktable 42 is fixedly installed on one side of the upper surface of the X-axis preload shaft mounting bracket 41 by bolts. The movable worktable 43 is slidably installed on the other side of the upper surface of the X-axis preload shaft mounting bracket 41. The upper surface of the X-axis preload shaft mounting bracket 41 is fixed. A limiting slide rail 411 adapted to the movable worktable 43 is installed. The movable worktable 44 is positioned above the movable worktable 43. A threaded sleeve 431 is fixedly installed on the lower surface of the movable worktable 43, and a pushing and pressing sleeve 432 is fixedly installed on the upper surface of the movable worktable 43. The upper surface of the movable worktable 44 is provided with a limiting slide groove adapted to the pushing and pressing sleeve 432. A pressure sensing device mounting plate 441 is fixedly installed inside the slide groove of the movable worktable 44. The middle part of the pressure sensing device mounting plate 441 is secured by bolts. A pressure sensing device 442 is fixedly installed. The side wall of the push extrusion sleeve 432 is provided with a sliding groove that matches the pressure sensing device mounting plate 441. The push extrusion sleeve 432 is located outside the pressure sensing device 442. An X-axis preload screw 47 is rotatably installed inside the X-axis preload shaft mounting bracket 41. An X-axis servo motor 46 that drives the X-axis preload screw 47 to rotate is fixedly installed inside the side of the X-axis preload shaft mounting bracket 41 near the fixed worktable 42. The inside of the threaded sleeve 431 is connected to the outer surface of the X-axis preload screw 47 by threads.In this embodiment, the multi-axis CNC machining equipment 1 moves the workpiece via the Y-axis moving component 3 and the X-axis moving preload component 4, and processes the workpiece via the Z-axis machining component 2, thus realizing multi-axis moving machining of the component. The X-axis preload axis mounting bracket 41 mainly serves to connect and fix with the sliding component of the Y-axis moving component 3, allowing the X-axis preload axis mounting bracket 41 to move along the Y-axis. The sliding component of the Y-axis moving component 3 mainly includes a lead screw and a sliding platform. At the same time, the X-axis preload axis mounting bracket 41 also serves to install and fix the worktable 42 and the moving worktable. The function of 43 is to clamp and fix the workpiece with the auxiliary cooperation of the workpiece fixing and correction component 5, and drive the workpiece to rotate. The workpiece is picked up manually or mechanically and placed between the two sets of workpiece fixing and correction components 5. The X-axis servo motor 46 is set to work on the operation panel of the multi-axis CNC machining equipment 1 to drive the X-axis preload screw 47 to rotate, so that the first moving worktable 43 moves under the limiting cooperation of the limit slide rail 411, thereby driving the second moving worktable 44 to move. The machine tool moves along the X-axis, thereby enabling the rotary table 45 to pre-press or pre-tension the workpiece. This, combined with the workpiece fixing and correction component 5, completes the workpiece installation. Specifically, the X-axis pre-tightening method for the workpiece is as follows: when the moving worktable 43 drives the moving worktable 44, the side wall of the pressing sleeve 432 will exert a pressing effect on the pressure sensing device 442. When the rotary table 45 exerts pressure on the workpiece in the X-direction, the pressure sensing device 442 transmits the actual X-direction force value data to the control system of the multi-axis CNC machining equipment 1 and compares it with the set force value. The system calculates the force value difference and drives the X-axis servo motor 46 to drive the X-axis pre-tightening screw 47 to pull the moving worktable 43 until the actual X-direction force value data matches the system's preset force value. At this point, the system sends a command to brake and clamp the X-axis servo motor 46, achieving a constant pre-tightening force on the workpiece by the rotary table 45. Then, machining of the workpiece begins under this constant pre-tightening force. Under a certain pre-tightening force, the workpiece is less prone to deformation, resulting in more stable dimensional accuracy and improved machining precision. ;

[0035] In Example 2, based on Example 1, the workpiece fixing table 51 is fixedly installed at one end of the output shaft of the turntable 45. The movable seat 52 is fixedly installed in the middle of the side surface of the workpiece fixing table 51. Movable blocks 522 are symmetrically slidably installed on both sides of the interior of the movable seat 52. A bidirectional telescopic rod 521 is fixedly installed in the middle of the interior of the movable seat 52. The output ends of the bidirectional telescopic rod 521 are respectively fixedly connected to the inner surface of the movable block 522. A workpiece fixing clamp 523 is fixedly installed on the outer surface of the movable block 522 by bolts. A push rod movable groove 5231 is provided in the middle of one end of the workpiece fixing clamp 523. Side push blocks 5234 are symmetrically slidably installed on both sides of the push rod movable groove 5231. A pressure sensing device 5235 is fixedly installed on one side surface of the side push block 5234. A compression pad 5233 is provided on the outside of the pressure sensing device 5235. A compression pad 5233 is fixedly installed on the side surface of the compression pad 5233. A spring support sleeve 5232 is provided, with one end of the spring support sleeve 5232 fixedly connected to the inner surface of the workpiece clamp 523. A tapered push rod 5241 is slidably installed inside the push rod movable groove 5231. A shaped extrusion pad 524 is fixedly installed at one end of the tapered push rod 5241. A wedge block adapted to the tapered push rod 5241 is fixedly installed on the other side surface of the side push block 5234. Workpiece side clamps 525 are symmetrically arranged on both sides of the shaped extrusion pad 524. The workpiece side clamps 525 are rotatably installed inside the workpiece clamp 523. A spring pull rod 5251 is movably installed between the outer surface of the workpiece side clamp 525 and the inner surface of the workpiece clamp 523. A movable clamping plate 5252 is hinged to the inner wall of the workpiece side clamp 525. An elastic pad 5253 is fixedly installed between the outer surface of the movable clamping plate 5252 and the inner surface of the workpiece side clamp 525.In this embodiment, the workpiece fixing table 51 is fixed to the output shaft of the turntable 45. As the turntable 45 rotates, when the workpiece is placed between the workpiece fixing tables 51, the bidirectional telescopic rod 521 retracts inward, causing the movable block 522 to move inward. The workpiece fixing clamp 523 clamps the workpiece, allowing the workpiece to be rotated by the turntable 45. The specific clamping process of the workpiece fixing clamp 523 is as follows: the workpiece fixing clamp 523 moves inward, causing the irregularly shaped extrusion pad 524 to contact the workpiece and be extruded, causing the conical push rod 5241 to move outward into the push rod movable groove 5231. At this time, the side push block 5234 is pushed outward by the conical push rod 5241, generating extrusion force between it and the extrusion pad 5233. The spring support sleeve 5232 mainly pushes the extrusion pad 5233 so that the pressure sensing device 5235 can obtain specific values. In this way, when the workpiece rotates with the turntable 45, the deviation force error caused by the rotation on both sides can be detected by the pressure sensing devices on both sides. The difference between 5235 is calculated and fed back to facilitate subsequent correction of the deflection force error, enabling the workpiece to overcome the deflection error and improve the workpiece machining accuracy. In addition, as the conical push rod 5241 pushes the side push block 5234, the side push block 5234 will compress one end of the workpiece side fixing clamp 525, causing the workpiece side fixing clamp 525 to deflect and further clamp the workpiece on both sides. The spring pull rod 5251 mainly functions to pull one end of the workpiece side fixing clamp 525 open when the workpiece side fixing clamp 525 is not compressed, facilitating workpiece clamping. It is particularly noteworthy that the movable clamping plate 5252, under the compression of the elastic pad 5253, can adaptively adjust according to the workpiece surface curvature. Furthermore, when the workpiece is clamped in place, one end of the irregularly shaped compression pad 524 can compress one end of the movable clamping plate 5252, causing the lower end of the movable clamping plate 5252 to exert an inward tightening force on the workpiece, making the workpiece installation more stable.

[0036] In Example 3, based on Example 2, the deflection correction disc 53 is fixedly installed on the middle of the side surface of the movable seat 52 by bolts. A pin fixing seat 531 is fixedly installed on the middle of the side surface of the deflection correction disc 53. A pin 532 is fixedly installed at one end of the pin fixing seat 531. A centering correction claw 5311 is symmetrically hinged to the side wall of the pin fixing seat 531. A telescopic rod 533 is fixedly installed on one side of the inside of the deflection correction disc 53. A pushing wedge 534 is fixedly installed at the output end of the telescopic rod 533. A movable wedge 535 is slidably installed in the middle of the inside of the movable seat 52. A limit spring rod 5351 is fixedly installed between the inner wall of one end of the movable wedge 535 and the inner surface of the deflection correction disc 53. The outer surface of the other end of the movable wedge 535 is connected to the centering correction claw 531. The inner surfaces of 1 are in contact; in this embodiment, according to embodiment two, when the workpiece rotates with the turntable 45, the deviation force error caused by the rotation on both sides can be calculated and fed back by the difference between the pressure sensing devices 5235 on both sides. The telescopic rod 533 inside the deflection correction disc 53 works to push the inclined block 534 to move inward and squeeze the movable wedge block 535, so that the movable wedge block 535 moves into the ejector pin fixing seat 531 and squeezes the inner side of the centering correction claw 5311, so that the centering correction claw 5311 is synchronously concentrated inward, and the outer wall of one end of the workpiece is centered and corrected, eliminating the deviation error caused by rotation. The ejector pin 532 mainly provides axial support for the workpiece after the workpiece is installed, which can reduce the axial vibration of the workpiece during the rotation process and improve the processing stability.

[0037] Example 4, based on Example 3, proposes a pre-tightening method for a multi-axis CNC machining equipment with pre-tightening force function, including the following steps: Step 1, clamping the workpiece by manually or mechanically gripping it and placing it between two sets of workpiece fixing and correction components 5. By setting the X-axis servo motor 46 to work on the operation panel of the multi-axis CNC machining equipment 1, the X-axis pre-tightening screw 47 is rotated, causing the first moving table 43 to move under the limiting cooperation of the limiting slide rail 411, thereby driving the second moving table 44 to translate in the X-axis direction of the machine tool, thus realizing the turntable 45 to pre-press or pre-tighten the workpiece. The bidirectional telescopic rod 521 retracts inward, driving the movable block 522 to move inward, and the workpiece fixing clamp 523 clamps the workpiece; Step 2, adjusting the X-axis pre-tightening. When the turntable 45 exerts pressure on the workpiece in the X direction, the pressure sensing device transmits the actual X-axis force value data to the control system of the multi-axis CNC machining equipment 1. The system compares the force value with the set force value, calculates the force difference, and drives the X-axis preload screw 47 through the X-axis servo motor 46 to move the moving worktable 43 until the actual X-direction force value is adjusted to match the system's preset force value. At this time, the system sends a command to brake and clamp the X-axis servo motor 46, so that the turntable 45 has a constant preload force on the workpiece, and then the workpiece can be processed. Step 3: Deflection correction is performed. When the workpiece rotates with the turntable 45, the deflection force error on both sides due to the rotation can be obtained by the difference between the pressure sensing devices 5235 on both sides and fed back. The telescopic rod 533 inside the deflection correction disc 53 works to push the inclined block 534 to move inward and squeeze the movable wedge 535, so that the movable wedge 535 moves into the ejector pin fixing seat 531 and squeezes the inner side of the centering correction claw 5311, so that the centering correction claw 5311 is synchronously concentrated inward, and the outer wall of the workpiece is centered and corrected to eliminate the deflection error.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-axis numerical control machining equipment with pre-tightening function, comprising a multi-axis numerical control machining equipment (1), a Z-axis machining component (2) is arranged above the multi-axis numerical control machining equipment (1), a Y-axis moving component (3) is arranged in front of the multi-axis numerical control machining equipment (1), characterized in that: The upper of Y axis moving part (3) is provided with X axis moving pre-tightening part (4), X axis moving pre-tightening part (4) includes X pre-tightening shaft mounting bracket (41), fixed workbench (42), moving workbench one (43) and moving workbench two (44), the upper of fixed workbench (42) and moving workbench two (44) are fixedly installed with rotary table (45), the output shaft side of rotary table (45) is provided with workpiece fixed correction part (5), workpiece fixed correction part (5) includes workpiece fixed platform (51), movable seat (52) and deflection correction disc (53), moving workbench two (44) is arranged in the upper of moving workbench one (43), the lower surface of moving workbench one (43) is fixedly installed with threaded sleeve (431), the upper surface of moving workbench one (43) is fixedly installed with push extrusion sleeve (432), the lower surface of moving workbench two (44) is provided with the limiting sliding slot that is adapted to push extrusion sleeve (432), the sliding slot inside moving workbench two (44) is fixedly installed with pressure sensing device mounting plate (441), the middle part of pressure sensing device mounting plate (441) is fixedly installed with pressure sensing device one (442) through bolt, the side wall of push extrusion sleeve (432) is provided with the sliding slot that is adapted to pressure sensing device mounting plate (441), push extrusion sleeve (432) is arranged outside pressure sensing device one (442), workpiece fixed platform (51) is fixedly installed in the output shaft one end of rotary table (45), movable seat (52) is fixedly installed in the middle part of the side surface of workpiece fixed platform (51), the inside two sides of movable seat (52) are symmetrically slidably installed with movable block (522), the inside middle part of movable seat (52) is fixedly installed with two-way telescopic rod (521), the output end of two-way telescopic rod (521) is fixedly connected with the inside surface of movable block (522) respectively, the outside surface of movable block (522) is fixedly installed with workpiece fixed clamp (523) through bolt, the middle part of one end of workpiece fixed clamp (523) is provided with top rod movable slot (5231), the both sides of top rod movable slot (5231) are symmetrically slidably installed with side push block (5234), the side surface of one side of side push block (5234) is fixedly installed with pressure sensing device two (5235), the outside of pressure sensing device two (5235) is provided with extrusion pad (5233), the side surface of extrusion pad (5233) is fixedly installed with spring support sleeve (5232), one end of spring support sleeve (5232) is fixedly connected with the inner surface of workpiece fixed clamp (523), the inside of top rod movable slot (5231) is slidably installed with conical top rod (5241), one end of conical top rod (5241) is fixedly installed with special-shaped extrusion pad (524), the other side surface of side push block (5234) is fixedly installed with wedge that is adapted to conical top rod (5241).

2. The multi-axis numerical control machining device with pre-tightening function according to claim 1, characterized in that: The bottom of the X pre-tightening shaft mounting frame (41) is fixedly connected above the sliding part of the Y-axis moving part (3) by bolts, the fixed workbench (42) is fixedly installed on one side of the upper surface of the X pre-tightening shaft mounting frame (41) by bolts, the moving workbench one (43) is slidingly installed on the other side of the upper surface of the X pre-tightening shaft mounting frame (41), and the upper surface of the X pre-tightening shaft mounting frame (41) is fixedly installed with a limiting slide rail (411) matched with the moving workbench one (43).

3. The multi-axis numerical control machining device with pre-tightening function according to claim 1, characterized in that: The X-axis pre-tightening lead screw (47) is rotatably installed in the X pre-tightening shaft mounting frame (41), the X-axis servo motor (46) for driving the X-axis pre-tightening lead screw (47) to rotate is fixedly installed on the inside of the side of the X pre-tightening shaft mounting frame (41) close to the fixed workbench (42), and the inside of the threaded sleeve (431) is threadedly connected with the outer surface of the X-axis pre-tightening lead screw (47).

4. The multi-axis numerical control machining device with pre-tightening function according to claim 1, characterized in that: The workpiece side fixing clamps (525) are symmetrically arranged on both sides of the special-shaped extrusion pad (524), the workpiece side fixing clamps (525) are rotatably installed on the inner side of the workpiece fixing clamp (523), the spring pull rods (5251) are movably installed between the outer side surface of the workpiece side fixing clamps (525) and the inner side surface of the workpiece fixing clamp (523), the movable clamping plates (5252) are hingedly installed on the inner side walls of the workpiece side fixing clamps (525), and the elastic washers (5253) are fixedly installed between the outer side surface of the movable clamping plates (5252) and the inner side surface of the workpiece side fixing clamps (525).

5. The multi-axis numerical control machining device with pre-tightening function according to claim 1, characterized in that: The deflection correction disc (53) is fixedly installed on the side surface of the movable seat (52), the thimble fixing seat (531) is fixedly installed on the side surface of the deflection correction disc (53), the thimble (532) is fixedly installed on one end of the thimble fixing seat (531), and the centering correction claws (5311) are hingedly installed on the side walls of the thimble fixing seat (531).

6. The multi-axis numerical control machining device with pre-tightening function according to claim 1, characterized in that: The deflection correction disc (53) is fixedly installed on the side surface of the movable seat (52), the thimble fixing seat (531) is fixedly installed on the side surface of the deflection correction disc (53), the thimble (532) is fixedly installed on one end of the thimble fixing seat (531), and the centering correction claws (5311) are hingedly installed on the side walls of the thimble fixing seat (531). The telescopic rod (533) is fixedly installed on one side of the inside of the deflection correction disc (53), the push inclined block (534) is fixedly installed on the output end of the telescopic rod (533), the movable wedge block (535) is slidingly installed in the middle of the inside of the movable seat (52), the limiting spring rod (5351) is fixedly installed between the inner wall of one end of the movable wedge block (535) and the inner side surface of the deflection correction disc (53), and the inner side surface of the other end of the movable wedge block (535) is in contact with the inner side surface of the centering correction claw (5311).

Images