A CNC machining fixture

Abstract

This utility model discloses a CNC machining fixture, which includes a positioning base plate. The upper surface of the positioning base plate is respectively provided with a front support platform, a rear support platform, a left support platform, and a right support platform in four directions (front, back, left, and right) corresponding to the edges of the plate-shaped workpiece. A front pressure block that can move up and down is provided on the outer side of the front support platform; a rear pressure block that can move up and down is provided on the outer side of the rear support platform. The CNC machining fixture designed in this utility model achieves precise positioning and omnidirectional limiting of the plate-shaped workpiece in the horizontal plane through the precise cooperation of pins, holes, and blocks; it achieves efficient clamping and zero surface damage by using a Z-shaped pressure block with a soft pad and pneumatic drive; the lockable floating top column in the middle effectively resists machining deformation and ensures machining accuracy; the overall structure has the advantages of high adaptability, automated operation, and efficient clamping, significantly improving machining quality and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining technology, and specifically to a CNC machining fixture. Background Technology

[0002] In the field of CNC machining, the precise positioning and clamping of plate-shaped workpieces are crucial for ensuring machining accuracy and quality. A plate-shaped workpiece 1 is provided; its structure is shown in the appendix. Figure 1 and attached Figure 2 As shown, the bottom left side of the plate-shaped workpiece 1 is provided with a left insertion hole 101 and a left insertion hole 102, and a left slot 103 is provided between the left insertion hole 101 and the left insertion hole 102; the bottom right side of the plate-shaped workpiece 1 is provided with a right pin 104 and a right pin 105, and a right slot 106 is provided between the right pin 104 and the right pin 105.

[0003] Traditional plate-shaped workpiece positioning fixtures mostly employ mechanical fixing structures, using bolts, pressure plates, and other components to clamp the workpiece. This results in problems such as cumbersome adjustments, low positioning accuracy, and easy damage to the workpiece surface. Especially for plate-shaped workpieces with complex bottom surface features (such as holes, slots, and pins), traditional fixtures struggle to achieve fast, stable, and damage-free clamping, leading to low processing efficiency and susceptibility to machining errors due to insecure positioning. Therefore, there is an urgent need for a dedicated CNC machining fixture capable of adapting to the complex structural features of plate-shaped workpieces and achieving multi-directional precise positioning to solve these problems.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a CNC machining fixture.

[0006] To achieve the above and other related objectives, the technical solution provided by this utility model is: a CNC machining fixture for positioning a plate-shaped workpiece, wherein a left insertion hole 1 and a left insertion hole 2 are provided on the left side of the bottom surface of the plate-shaped workpiece, and a left slot is provided between the left insertion hole 1 and the left insertion hole 2; a right pin 1 and a right pin 2 are provided on the right side of the bottom surface of the plate-shaped workpiece, and a right slot is provided between the right pin 1 and the right pin 2. The fixture includes a positioning base plate, and the upper surface of the positioning base plate is provided with a front support platform, a rear support platform, a left support platform, and a right support platform in the four directions of front, back, left, and right, respectively, which are used to support the four edges of the plate-shaped workpiece; a front pressure block that can move up and down is provided on the outer side of the front support platform; a rear pressure block that can move up and down is provided on the outer side of the rear support platform.

[0007] Furthermore, the left side of the left support platform is provided with a detachable left stop block 1 and a left stop block 2; the left support platform is provided with a first pin corresponding to the left insertion hole 1 and a second pin corresponding to the left insertion hole 2; a left insertion block corresponding to the left slot is provided between the first pin and the second pin; the right side of the right support platform is provided with a detachable right stop block 1 and a right stop block 2; the right support platform is provided with a first insertion hole corresponding to the right pin 1 and a second insertion hole corresponding to the right pin 2; a right insertion block corresponding to the right slot is provided between the first insertion hole and the second insertion hole.

[0008] Furthermore, a top column that can float up and down is provided in the middle of the positioning base plate. The top column is located at the upper end of a floating column, and the lower end of the floating column has an installation groove, in which a compression spring is installed. The floating column is embedded in a box, and the lower part of the floating column has a beveled surface. A vertical shaft is provided on one side of the floating column, and the vertical shaft is fixed in the box. A rotatable inner swing arm is sleeved on the vertical shaft. One end of the inner swing arm is located on one side of the beveled surface, and the other end of the inner swing arm is rotatably connected to the extended end of a horizontal cylinder. The side of the inner swing arm near the floating column has a beveled surface corresponding to the beveled surface.

[0009] In its initial state, the floating column is compressed by the bottom spring, and its upper end floats out of the upper surface of the box. When the plate-shaped workpiece presses down on the top column, the top column presses down with the floating column, so that the entire floating column is embedded in the box. At this time, the horizontal cylinder extends and drives the inner swing arm to rotate, so that the inclined surface of the inner swing arm can abut against the tangential inclined surface of the floating column. When the floating column needs to float up, the horizontal cylinder can be controlled to retract.

[0010] Furthermore, both the front pressure block and the rear pressure block are Z-shaped; a soft front pad is fixed to the lower part of the front pressure block near the end of the plate-shaped workpiece; a soft rear pad is fixed to the lower part of the rear pressure block near the end of the plate-shaped workpiece.

[0011] Furthermore, the rear end of the front pressure block is connected to the extended end of a front cylinder, the middle part of the front pressure block is rotatably connected to the upper end of a front swing arm, the lower end of the front swing arm is rotatably connected to a front fixed block, and the front fixed block is fixed on the front cylinder; when the rod of the front cylinder extends upward, the front pressure block rotates around the front swing arm, and the front end of the front pressure block swings downward to press down on the plate-shaped workpiece; when the rod of the front cylinder retracts downward, the front pressure block rotates around the front swing arm, and the front end of the front pressure block swings upward and lifts away from the surface of the plate-shaped workpiece.

[0012] The rear end of the rear pressure block is connected to the extended end of a rear cylinder, the middle part of the rear pressure block is rotatably connected to the upper end of a rear swing arm, and the lower end of the rear swing arm is rotatably connected to a rear fixed block, which is fixed to the rear cylinder. When the rod of the rear cylinder extends upward, the rear pressure block rotates around the rear swing arm, and the rear end of the rear pressure block swings downward to press against the plate-shaped workpiece. When the rod of the rear cylinder retracts downward, the rear pressure block rotates around the rear swing arm, and the rear end of the rear pressure block swings upward and lifts away from the surface of the plate-shaped workpiece.

[0013] Furthermore, the fixture also includes a mounting frame, on which a first fixed seat and a second fixed seat are respectively provided on the left and right sides. The inner side of the first fixed seat is connected to a first support seat that can swing back and forth, and the inner side of the second fixed seat is connected to a second support seat that can swing back and forth. Both the first support seat and the second support seat are bent inward. The left and right sides of the positioning base plate are detachably fastened to the first support seat and the second support seat respectively.

[0014] Furthermore, a mounting base plate is provided below the positioning base plate, and the mounting base plate is detachably fixed to the middle position of the positioning base plate. A front placement groove and a rear placement groove are respectively opened on the front and rear sides of the positioning base plate. The front cylinder is located in the front placement groove and its lower end is fixed to the mounting base plate; the rear cylinder is located in the rear placement groove and its lower end is fixed to the mounting base plate.

[0015] Furthermore, a central placement groove is provided in the middle of the positioning base plate, and the horizontal cylinder and the housing are both located in the central placement groove and their lower ends are fixed to the mounting base plate.

[0016] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows: 1. High-precision positioning and all-round limiting: The fixture uses the pins, holes and blocks on the left and right support platforms to cooperate with the left hole, right pin and slot on the bottom surface of the plate-shaped workpiece, so as to achieve precise positioning of the plate-shaped workpiece in the horizontal direction; at the same time, the front, rear, left and right support platforms jointly constrain the edge of the plate-shaped workpiece, and combined with the detachable stop block, restrict the movement of multiple degrees of freedom of the plate-shaped workpiece, ensuring that there is no risk of displacement during the processing.

[0017] 2. Flexible clamping and surface protection: The front and rear clamping blocks are driven by a Z-shaped swing arm structure, and the clamping end is equipped with a soft pad. Under the drive of the cylinder, it can achieve rapid clamping or release, which not only ensures the uniform distribution of clamping force, but also avoids scratches or deformation caused by the clamping blocks directly contacting the surface of the plate-shaped workpiece.

[0018] 3. Floating Support to Prevent Deformation: The fixture features a floating top column structure in the center. Initially, it is supported by a compression spring and floats to bear the weight of the plate-shaped workpiece. When the workpiece is pressed down, the top column sinks and is locked in position by an inner swing arm driven by a cylinder, forming a rigid support. This design effectively resists deformation of the plate-shaped workpiece caused by cutting forces during machining, improving the flatness of the machined surface. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front structure of the plate-shaped workpiece of this utility model; Figure 2 This is a schematic diagram of the back structure of the plate-shaped workpiece of this utility model; Figure 3 This is a schematic diagram of the overall structure of the processing fixture of this utility model; Figure 4 This is a schematic diagram of the processing fixture of this utility model; Figure 5 This is a schematic diagram of the mounting bracket and related structures of this utility model; Figure 6 This is an external schematic diagram of the top column and related structures of this utility model; Figure 7 This is a schematic diagram of the top column and related structures of this utility model. Figure 8 This is a schematic diagram of the front pressure block and related structures of this utility model; Figure 9 This is a schematic diagram of the rear pressure block and related structures of this utility model; In the above attached figures, 1. Plate-shaped workpiece; 101. Left insertion hole one; 102. Left insertion hole two; 103. Left slot; 104. Right pin one; 105. Right pin two; 106. Right slot; 2. Positioning base plate; 3. Front support platform; 4. Rear support platform; 5. Left support platform; 6. Right support platform; 7. Front pressure block; 8. Rear pressure block; 9. Left stop block one; 10. Left stop block two; 11. First pin; 12. Second pin; 13. Left insert block; 14. Right stop block one; 15. Right stop block two; 16. First insertion hole; 17. Second insertion hole; 18. Right insert block; 19. Top column; 20. Floating column; 21. Mounting groove; 22. Compression spring; 23. Housing; 24. Inclined 25. Cross-section; 26. Vertical axis; 27. Inner swing arm; 28. Horizontal cylinder; 29. ​​Inclined surface; 30. Front pad block; 31. Rear pad block; 32. Front cylinder; 33. Front fixed block; 34. Rear cylinder; 35. Rear swing arm; 36. Rear fixed block; 37. Mounting bracket; 38. First fixed seat; 39. Second fixed seat; 40. First support seat; 41. Second support seat; 42. Mounting base plate; 43. Front placement slot; 44. Rear placement slot; 45. Middle placement slot. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0025] Example: This embodiment provides a CNC machining fixture for positioning a plate-shaped workpiece 1. (See attached document.) Figure 1 and attached Figure 2 As shown, the bottom left side of the plate-shaped workpiece 1 is provided with a left insertion hole 101 and a left insertion hole 102, and a left slot 103 is provided between the left insertion hole 101 and the left insertion hole 102; the bottom right side of the plate-shaped workpiece 1 is provided with a right pin 104 and a right pin 105, and a right slot 106 is provided between the right pin 104 and the right pin 105. See appendix Figure 3 and attached Figure 4 As shown, the fixture includes a positioning base plate 2. The upper surface of the positioning base plate 2 is provided with a front support platform 3, a rear support platform 4, a left support platform 5, and a right support platform 6 in four directions, corresponding to the edges of the plate-shaped workpiece 1, respectively; these support platforms are used to support the four edges of the plate-shaped workpiece 1. A front pressure block 7 (two front pressure blocks 7 arranged side-by-side) is provided on the outer side of the front support platform 3, allowing it to move up and down. A rear pressure block 8 (two rear pressure blocks 8 arranged side-by-side) is provided on the outer side of the rear support platform 4, also allowing it to move up and down. See appendix Figure 4As shown, the left side of the left support platform 5 is provided with a detachable left stop block 1 9 and a left stop block 2 10; the left support platform 5 is provided with a first pin 11 corresponding to the left insertion hole 101 and a second pin 12 corresponding to the left insertion hole 2 102; a left insertion block 13 corresponding to the left slot 103 is provided between the first pin 11 and the second pin 12; the right side of the right support platform 6 is provided with a detachable right stop block 14 and a right stop block 2 15; the right support platform 6 is provided with a first insertion hole 16 corresponding to the right pin 104 and a second insertion hole 17 corresponding to the right pin 2 105; a right insertion block 18 corresponding to the right slot 106 is provided between the first insertion hole 16 and the second insertion hole 17.

[0026] See appendix Figure 6 and attached Figure 7 As shown, a top column 19 that can float up and down is provided in the middle of the positioning base plate 2. There are two top columns 19. The top column 19 is located at the upper end of a floating column 20. The lower end of the floating column 20 has a mounting groove 21, and a compression spring 22 is installed in the mounting groove 21. The floating column 20 is embedded in a box 23. The lower part of the floating column 20 has a beveled surface 24. A vertical shaft 25 is provided on one side of the floating column 20. The vertical shaft 25 is fixed in the box 23. A rotatable inner swing arm 26 is sleeved on the vertical shaft 25. One end of the inner swing arm 26 is located on one side of the beveled surface 24. The other end of the inner swing arm 26 is rotatably connected to the extended end of a horizontal cylinder 27. The side of the inner swing arm 26 near the floating column 20 has a beveled surface 28 corresponding to the beveled surface 24. In its initial state, the floating column 20 is subjected to the action of the bottom compression spring 22, and its upper end floats out of the upper surface of the box 23. The lower end of the compression spring 22 extends out of the mounting groove 21 and abuts against the lower plate. When the plate-shaped workpiece 1 above presses against the top column 19, the top column 19 presses down with the floating column 20, so that the entire floating column 20 is embedded in the box 23. At this time, the horizontal cylinder 27 extends and drives the inner swing arm 26 to rotate, so that the inclined surface 28 of the inner swing arm 26 can abut against the tangential inclined surface 28 of the floating column 20. When the floating column 20 needs to float up, the horizontal cylinder 27 can be controlled to retract.

[0027] See appendix Figure 8 and attached Figure 9As shown, both the front pressure block 7 and the rear pressure block 8 are Z-shaped. A soft front pad 29 is fixed to the lower part of the front pressure block 7 near the end of the plate-shaped workpiece 1; a soft rear pad 30 is fixed to the lower part of the rear pressure block 8 near the end of the plate-shaped workpiece 1. The front pressure block 7 and the rear pressure block 8 can be rubber pads to prevent damage to the surface of the plate-shaped workpiece 1 when the pressure blocks are pressed down. The rear end of the front pressure block 7 is connected to the extended end of a front cylinder 31. The middle part of the front pressure block 7 is rotatably connected to the upper end of a front swing arm 32. The lower end of the front swing arm 32 is rotatably connected to a front fixed block 33, which is fixed to the front cylinder 31. When the rod of the front cylinder 31 extends upward, the front pressure block 7 rotates around the front swing arm 32, and the front end of the front pressure block 7 swings downward to press down on the plate-shaped workpiece 1. When the rod of the front cylinder 31 retracts downward, the front pressure block 7 rotates around the front swing arm 32, and the front end of the front pressure block 7 swings upward and lifts away from the surface of the plate-shaped workpiece 1. The rear end of the rear pressure block 8 is connected to the extended end of a rear cylinder 34. The middle part of the rear pressure block 8 is rotatably connected to the upper end of a rear swing arm 35. The lower end of the rear swing arm 35 is rotatably connected to a rear fixed block 36, which is fixed to the rear cylinder 34. When the rod of the rear cylinder 34 extends upward, the rear pressure block 8 rotates around the rear swing arm 35, and the rear end of the rear pressure block 8 swings downward to press against the plate-shaped workpiece 1. When the rod of the rear cylinder 34 retracts downward, the rear pressure block 8 rotates around the rear swing arm 35, and the rear end of the rear pressure block 8 swings upward to lift off the surface of the plate-shaped workpiece 1.

[0028] See appendix Figure 3 and attached Figure 5 As shown, the fixture also includes a mounting frame 37. A first fixed seat 38 and a second fixed seat 39 are respectively provided on the left and right sides of the mounting frame 37. A first support seat 40 that can swing back and forth is connected to the inner side of the first fixed seat 38. A second support seat 41 that can swing back and forth is connected to the inner side of the second fixed seat 39. Both the first support seat 40 and the second support seat 41 are bent inward. The left and right sides of the positioning base plate 2 are detachably and fastened to the first support seat 40 and the second support seat 41 respectively.

[0029] See appendix Figure 3 and attached Figure 4 As shown, a mounting base plate 42 is provided below the positioning base plate 2, and the mounting base plate 42 is detachably fixed in the middle position of the positioning base plate 2. A front placement groove 43 and a rear placement groove 44 are respectively opened on the front and rear sides of the positioning base plate 2. The front cylinder 31 is located in the front placement groove 43 and its lower end is fixed to the mounting base plate 42; the rear cylinder 34 is located in the rear placement groove 44 and its lower end is fixed to the mounting base plate 42. A middle placement groove 45 is opened in the middle of the positioning base plate 2, and the horizontal cylinder 27 and the housing 23 are both located in the middle placement groove 45 and their lower ends are fixed to the mounting base plate 42.

[0030] Positioning Principle: 1. Initial Placement and Support: The plate-shaped workpiece 1 is placed on the front, rear, left, and right support platforms 6, with the middle section temporarily supported by a floating top column 19 to avoid rigid collisions. 2. Horizontal Positioning: The left insertion hole 101 and the left insertion hole 102 on the bottom surface of the plate-shaped workpiece 1 engage with the first pin 11 and the second pin 12 on the left support platform 5, while the right pin 104 and the right pin 105 engage with the first insertion hole 16 and the second insertion hole 17 on the right support platform 6. Simultaneously, the left slot 103 engages with the left insertion block 13, and the right slot 106 engages with the right insertion block 18, completing the precise positioning and rotational freedom constraint of the plate-shaped workpiece 1 in the XY plane. 3. Pressing and Locking: The front and rear cylinders 34 drive the pressure block to press down, pressing the edge of the plate-shaped workpiece 1 with soft pads; at the same time, the horizontal cylinder 27 pushes the inner swing arm 26 to lock the floating top column 19, forming a rigid support in the middle, ultimately achieving full-degree-of-freedom fixation of the plate-shaped workpiece 1.

[0031] The CNC machining fixture designed in this utility model achieves precise positioning and all-round limiting of the plate-shaped workpiece 1 on the horizontal plane through the precise cooperation of pins, holes and blocks; it adopts Z-shaped pressure blocks with soft pads and pneumatic drive to achieve efficient clamping and zero surface damage; the lockable floating top column 19 in the middle effectively resists machining deformation and ensures machining accuracy; the overall structure has the advantages of high adaptability, automated operation and efficient clamping, which significantly improves machining quality and efficiency.

[0032] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A CNC machining fixture for positioning a plate-shaped workpiece (1). The bottom left side of the plate-shaped workpiece (1) is provided with a left insertion hole one (101) and a left insertion hole two (102), and a left slot (103) is provided between the left insertion hole one (101) and the left insertion hole two (102). The bottom right side of the plate-shaped workpiece (1) is provided with a right pin one (104) and a right pin two (105), and a right slot (106) is provided between the right pin one (104) and the right pin two (105). Its features are: The fixture includes a positioning base plate (2), and the upper end surface of the positioning base plate (2) is provided with a front support platform (3), a rear support platform (4), a left support platform (5) and a right support platform (6) corresponding to the edge of the plate-shaped workpiece (1) in the four directions of front, back, left and right. The front support platform (3) is provided with a front pressure block (7) that can move up and down on the outside. The rear support platform (4) is provided with a rear pressure block (8) that can move up and down on the outside.

2. The CNC machining fixture according to claim 1, characterized in that: The left support platform (5) is provided with a detachable left stop block 1 (9) and a left stop block 2 (10) on its left side; the left support platform (5) is provided with a first pin (11) corresponding to the left insertion hole 1 (101) and a second pin (12) corresponding to the left insertion hole 2 (102); a left insertion block (13) corresponding to the left slot (103) is provided between the first pin (11) and the second pin (12); The right support platform (6) is provided with a detachable right stop block 1 (14) and right stop block 2 (15) on the right side; the right support platform (6) is provided with a first insertion hole (16) corresponding to the right pin 1 (104) and a second insertion hole (17) corresponding to the right pin 2 (105); a right insertion block (18) corresponding to the right slot (106) is provided between the first insertion hole (16) and the second insertion hole (17).

3. The CNC machining fixture of claim 1, wherein: The positioning base plate (2) is provided with a top column (19) that can float up and down in the middle.

4. The CNC machining fixture of claim 3, wherein: The top column (19) is set at the upper end of a floating column (20), and the lower end of the floating column (20) is provided with an installation groove (21), and a compression spring (22) is provided in the installation groove (21). The floating column (20) is embedded in a box (23). The lower part of the floating column (20) is provided with a beveled surface (24). A vertical shaft (25) is provided on one side of the floating column (20). The vertical shaft (25) is fixed in the box (23). A rotatable inner swing arm (26) is sleeved on the vertical shaft (25). One end of the inner swing arm (26) is located on one side of the beveled surface (24). The other end of the inner swing arm (26) is rotatably connected to the extended end of a horizontal cylinder (27). The side of the inner swing arm (26) near the floating column (20) is provided with a beveled surface (28) corresponding to the beveled surface (24).

5. The CNC machining fixture of claim 1, wherein: Both the front pressure block (7) and the rear pressure block (8) are Z-shaped; a soft front pad (29) is fixed to the lower part of the front pressure block (7) near the end of the plate-shaped workpiece (1); a soft rear pad (30) is fixed to the lower part of the rear pressure block (8) near the end of the plate-shaped workpiece (1).

6. A CNC machining fixture according to claim 4, characterized in that: The rear end of the front pressure block (7) is connected to the extended end of a front cylinder (31), the middle part of the front pressure block (7) is rotatably connected to the upper end of a front swing arm (32), the lower end of the front swing arm (32) is rotatably connected to a front fixed block (33), and the front fixed block (33) is fixed on the front cylinder (31). The rear end of the rear pressure block (8) is connected to the extended end of a rear cylinder (34), the middle part of the rear pressure block (8) is rotatably connected to the upper end of a rear swing arm (35), the lower end of the rear swing arm (35) is rotatably connected to a rear fixing block (36), and the rear fixing block (36) is fixed on the rear cylinder (34).

7. The CNC machining fixture of claim 1, wherein: The fixture also includes a mounting frame (37), on the left and right sides of which a first fixed seat (38) and a second fixed seat (39) are respectively provided. The inner side of the first fixed seat (38) is connected to a first support seat (40) that can swing back and forth, and the inner side of the second fixed seat (39) is connected to a second support seat (41) that can swing back and forth. The first support seat (40) and the second support seat (41) are both bent inward. The left and right sides of the positioning base plate (2) are detachably fastened to the first support seat (40) and the second support seat (41) respectively.

8. The CNC machining fixture of claim 6, wherein: A mounting base plate (42) is provided below the positioning base plate (2), and the mounting base plate (42) is detachably fixed in the middle position of the positioning base plate (2).

9. The CNC machining fixture of claim 8, wherein: The positioning base plate (2) has a front placement groove (43) and a rear placement groove (44) on its front and rear sides respectively. The front cylinder (31) is located in the front placement groove (43) and its lower end is fixed on the mounting base plate (42). The rear cylinder (34) is located in the rear placement groove (44) and its lower end is fixed on the mounting base plate (42).

10. The CNC machining fixture of claim 8, wherein: The positioning base plate (2) has a central placement groove (45) in the middle. The horizontal cylinder (27) and the box body (23) are both located in the central placement groove (45) and their lower ends are fixed on the mounting base plate (42).

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