Sheet metal shaping device and u-shaped piece shaping method based on the device

Abstract

The application discloses a sheet metal shaping device and a U-shaped piece shaping method based on the device, and relates to the technical field of sheet metal processing, in particular to a sheet metal shaping device and a U-shaped piece shaping method based on the device. The device comprises a workbench, and a shaping device for deburring processing of a sheet metal piece is arranged on the workbench. The shaping device is a down-pressing linkage type three-face burr shaping structure. The shaping device comprises a die structure for placing the sheet metal piece. Both sides of the die structure are provided with polishing structures. The die structure comprises a lower die plate and a pressing plate. Both sides of the pressing plate are provided with driving blocks. The bottom of each driving block and the top of the corresponding polishing structure are tangent inclined surfaces. The driving blocks and the polishing structures are in contact with each other to form a deburring structure which moves synchronously to the die structure and polishes the sheet metal piece on the die structure. The application can simultaneously process the inner walls of two coaxial holes of the sheet metal piece and polish and shape the relative inner side of the sheet metal piece. The synchronism is high, the processing precision is effectively improved, and the processing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing technology, and in particular to a sheet metal shaping device and a U-shaped part shaping method based on the shaping device. Background Technology

[0002] In the processing of automotive shock absorber mounting rings, flat sheet metal parts need to be cut and bent to form a U-shaped connector. Then, holes for mounting wheels are coaxially punched at both ends of the U-shaped connector. Burrs are prone to appear at the cutting and punching parts. Connectors with burrs will be affected during installation. Furthermore, since shock absorbers are vibration and stress-bearing components, they may crack during use.

[0003] Previously, removing burrs required placing the sheet metal on a mold and grinding the burrs with a grinding wheel. However, the small size of the coaxial holes on the connectors made grinding inconvenient. Connectors used for automotive shock absorber mounting rings require high precision; if grinding the two coaxial holes with a grinding wheel results in misalignment, the connector cannot be installed with other components, or even malfunctions during use, potentially leading to traffic accidents. Similarly, the opposite sides of the U-shaped connector are not easily machined directly with a grinding wheel. Vibration between the sheet metal and the mold during grinding causes the sheet metal to shift, resulting in poor grinding performance. Therefore, it is necessary to provide a sheet metal shaping device and a shaping method based on this device that provides good sheet metal fixation and can simultaneously grind the inner sides of the coaxial holes and the opposite surfaces of the sheet metal. Summary of the Invention

[0004] The present invention provides a sheet metal shaping device and a shaping method based on the shaping device, which solves the existing problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sheet metal shaping device includes a worktable with a shaping device for deburring sheet metal parts. The shaping device is a three-sided deburring structure with downward linkage. The shaping device includes a mold structure for placing the sheet metal parts. Both sides of the mold structure are provided with grinding structures. The mold structure includes a lower template and a pressure plate. Both sides of the pressure plate are provided with driving blocks. The bottom of the driving block and the top of the corresponding grinding structure are mutually tangent inclined surfaces. The driving block and the grinding structure contact each other to form a deburring structure that moves synchronously towards the mold structure to grind the sheet metal parts on the mold structure.

[0007] Preferably, the mold structure further includes a lower mold base, the lower template is installed in the upper middle part of the lower mold base, the sheet metal part is placed in the upper middle part of the lower template, the lower template has symmetrically opened slots at the front and back, and the slots are provided with lower mold shaping inserts.

[0008] Preferably, the grinding structure includes lower die sliders located on both sides of the lower template. The top of each lower die slider is an inclined surface that slides tangentially with the driving block. Each lower die base on both sides of the lower template is provided with a sliding groove. The bottom of each lower die module is provided with a slider that slides slidably with the sliding groove. A side-forming punch is provided on the side of each lower die slider near the lower template. Each lower die module has a guide block on its side, and the driving block opposite it has a guide groove on the same side for sliding with the guide block. The synchronization between the driving block and the lower die slider is further improved through the sliding cooperation between the guide block and the guide groove.

[0009] Preferably, the lower template has a through groove extending through both sides and the top of the lower template. A part ejection float is movably disposed within the through groove, and second springs are symmetrically disposed at both ends of the bottom of the part ejection float. The part ejection float has a mountain-shaped structure, with the protruding ends on both sides of the part ejection float extending from the sides of the through groove, and the protruding end in the middle of the part ejection float extending from the top of the through groove. By being compressed and bounced up by the second springs, the three protruding ends of the part ejection float can protrude above the top of the lower template to eject the sheet metal part, or the three protruding ends of the part ejection float can be lower than the top surface of the lower template, without affecting the deburring process of the sheet metal part.

[0010] Preferably, the lower mold plate has two symmetrical rectangular slots at its top, and the rectangular slots are equipped with lower mold outer positioning devices. The sheet metal part is positioned between the two lower mold outer positioning devices. The two lower mold outer positioning devices are used to position the sheet metal part and prevent it from moving left or right during deburring.

[0011] Preferably, the pressure plate and the driving block are both fixedly installed at the bottom of an upper mold base. The pressure plate is located in the middle of the bottom surface of the upper mold base, and the two driving blocks are respectively located on the upper mold base on both sides of the pressure plate. A first pressure plate insert is connected to the lower part of the pressure plate, and the top of the upper mold base is connected to a lifting rod. The pressure plate, driving blocks, and upper mold base all move up and down via the lifting rod.

[0012] Preferably, three first springs are evenly spaced in the middle of the pressure plate, and two second pressure plate inserts are symmetrically arranged below the pressure plate. The positions of the second pressure plate inserts correspond to the outer positioning of the lower mold, so that after the pressure plate descends, the outer positioning of the lower mold contacts the pressure plate inserts, preventing the sheet metal part from moving left or right. At the same time, the three first springs contact the top of the sheet metal part as the pressure plate descends, pressing the sheet metal part against the top of the lower mold plate for fixation. The first springs can also extend and retract to adapt to the downward pressure height of the pressure plate, preventing damage to the sheet metal part. In addition, when the ejection float removes the sheet metal part, it plays an auxiliary limiting role, preventing the ejection float from lifting the sheet metal part too high and causing it to fall outside.

[0013] Preferably, each of the side-forming punches has a motor at one end facing the lower template. The output shaft of the motor is detachably fitted with a grinding block. A controller is located inside the lower mold base, and a switch is located at the bottom of the through slot. The switch and motor are respectively connected to the controller. When the first spring presses the sheet metal part against the top of the lower template, the bottom of the ejector block contacts the switch, causing the controller to control the motor to work and deburr the ejector block using the grinding block. The grinding block is used to extend into the two coaxial holes of the sheet metal part for grinding. The grinding block can be replaced according to the model and size of the sheet metal part.

[0014] Preferably, the two lower mold shaping inserts have a circular hole in the middle, and a first-type plum blossom coupling is movably installed in the circular hole. A grinding disc is fixed to the outside of the first-type plum blossom coupling, and the output shaft end of the motor has a second-type plum blossom coupling that is fitted and connected to the first-type plum blossom coupling. While the motor drives the grinding block to rotate, the first-type plum blossom coupling and the second-type plum blossom coupling are connected, driving the grinding disc to rotate, thereby realizing the simultaneous grinding of the inner sides of the coaxial holes on both sides of the sheet metal part and the opposite surfaces at both ends of the sheet metal part.

[0015] A method for shaping a U-shaped part based on the shaping device described above includes the following steps:

[0016] S1. Place the sheet metal part between the two lower mold outer positioning points at the top of the lower template;

[0017] S2. Start the lifting rod to drive the upper mold base to descend. At the same time, the drive block follows the upper mold base. The bottom inclined surface of the drive block contacts the top inclined surface of the lower mold slider, thereby causing the lower mold slider to move to the lower template through the slide groove.

[0018] S3. At the same time, the lower mold outer positioning contacts the pressure plate insert to prevent the sheet metal part from moving left and right, thereby achieving the positioning of the sheet metal part. The first spring contacts the top of the sheet metal part as the pressure plate descends to fix the sheet metal part. The first plum blossom coupling at the motor output end is engaged with the second plum blossom coupling.

[0019] S4. As the first spring descends, the ejector float compresses the second spring and descends accordingly. The bottom of the ejector float contacts the switch, and at the same time, the grinding block of the side forming punch contacts the sheet metal. The controller controls the motor to work and grind the inner side of the hole on both sides of the sheet metal through the grinding block. At the same time, due to the connection between the first and second plum blossom couplings, the grinding disc grinds the inner side of the opposite surface of the sheet metal, realizing the synchronous deburring and shaping of the inner side of the coaxial hole and the opposite surface of the sheet metal.

[0020] S5. After grinding, the upper mold base and lower mold slider are reset, and the second spring releases its elastic force to remove the part floating block, thereby completing the removal of the sheet metal part.

[0021] The beneficial effects of this invention are as follows: A grinding block and a second perforated coupling are installed on the output shaft of the motor, while a first perforated coupling and a grinding disc are installed on the lower die forming insert. During operation, the first and second perforated couplings are connected, allowing the motor to drive the grinding block to rotate and grind the two coaxial holes of the sheet metal part. Simultaneously, the grinding disc rotates with the first perforated coupling to grind the opposite surfaces of the sheet metal part, achieving simultaneous grinding of the inner walls of the two coaxial holes of the U-shaped sheet metal part and grinding and shaping of the opposite inner surfaces of the sheet metal part. The top of the lower die slider is an inclined surface that slides tangentially to the bottom of the drive block, allowing the lower die slider to synchronously approach the lower die plate, enabling the two side forming punches to synchronously contact and process the two sides of the sheet metal part. This design ensures the synchronization of grinding on both sides of the sheet metal part, reduces displacement errors caused by vibration, and improves processing accuracy. Simultaneously, two side forming punches fix both sides of the sheet metal part; three first springs contact the top of the sheet metal part to fix the top of the sheet metal part; two lower mold external positioning devices limit the left and right sides of the sheet metal part, achieving omnidirectional fixing and positioning of the sheet metal part on the top of the lower mold, greatly reducing the impact of vibration on the sheet metal part; a part ejection float and a second spring are set inside the lower mold, allowing the sheet metal part to spring up under the compression of the second spring. The three protruding ends of the part ejection float can protrude from the top of the lower mold to eject the sheet metal part, achieving automatic material ejection after processing. This multi-functional integrated structure improves processing efficiency.

[0022] This invention relates to a shaping method based on a shaping device, which realizes the synchronous processing of the inner sides of two coaxial holes of a sheet metal part and the grinding and shaping of the relative inner sides of the sheet metal part. This improves the deburring, grinding and shaping effects, achieves multi-directional fixation of the sheet metal part, improves the fixation effect during sheet metal part processing, and can automatically perform material removal after processing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the components of the present invention before they are assembled.

[0024] Figure 2 This is a schematic diagram of the lower mold structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the upper mold structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 5 This is an enlarged schematic diagram of the lower mold shaping insert part of the present invention.

[0028] The following are the labeling elements in the diagram: 1. Lower mold base; 2. Lower template; 3. Sheet metal part; 4. Lower mold forming insert; 51. Plum blossom coupling one; 52. Plum blossom coupling two; 6. Lower module; 7. Side forming punch; 8. Drive block; 9. Pressure plate; 11. Second spring; 12. Part ejection float; 13. Grinding disc; 14. Lower mold external positioning; 15. Upper mold base; 16. First pressure plate insert; 17. First spring; 18. Second pressure plate insert; 19. Motor; 20. Grinding block; 21. Slide groove; 22. Lower mold slider; 23. Guide block; 24. Guide groove; 25. Through groove; 26. Controller; 27. Switch. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figures 1-5 A sheet metal shaping device includes a worktable with a shaping device for deburring sheet metal parts 3. The shaping device is a three-sided deburring structure with downward linkage. The shaping device includes a mold structure for placing the sheet metal parts 3. Both sides of the mold structure are provided with grinding structures. The mold structure includes a lower template 2 and a pressure plate 9. Both sides of the pressure plate 9 are provided with driving blocks 8. The bottom of the driving block 8 and the top of the corresponding grinding structure are tangent to each other. The driving block 8 and the grinding structure contact each other to form a deburring structure that moves synchronously towards the mold structure to grind the sheet metal parts 3 on the mold structure.

[0031] The mold structure also includes a lower mold base 1, the lower template 2 is installed in the upper middle part of the lower mold base 1, the sheet metal part 3 is placed in the upper middle part of the lower template 2, the lower template 2 has symmetrical slots on the front and back, and the slots are provided with lower mold shaping inserts 4.

[0032] The grinding structure includes lower mold sliders 22 located on both sides of the lower template 2. The top of each lower mold slider 22 is an inclined surface that slides tangentially with the driving block 8. Each lower mold base 1 on both sides of the lower template 2 is provided with a sliding groove 21. The bottom of the lower module 6 is provided with a lower mold slider 22 that slides slidably with the sliding groove 21. A side-forming punch 7 is provided on the side of each lower module 6 near the lower template 2. Each lower module 6 has a guide block 23 on its side, and the driving block 8 opposite it has a guide groove 24 on the same side for sliding with the guide block 23. The sliding cooperation between the guide block 23 and the guide groove 24 further improves the synchronization between the driving block 8 and the lower mold slider 22.

[0033] The lower template 2 is provided with a through groove 25 that runs through both sides and the top of the lower template 2. A part ejection float 12 is movably installed in the through groove 25. The bottom ends of the part ejection float 12 are symmetrically provided with second springs 11. The part ejection float 12 has a mountain-shaped structure. The protruding ends on both sides of the part ejection float 12 extend from the sides of the through groove 25, and the protruding end in the middle of the part ejection float 12 extends from the top of the through groove 25. By being compressed and bounced up by the second springs 11, the three protruding ends of the part ejection float 12 can protrude above the top of the lower template 2 to eject the sheet metal part 3, or the three protruding ends of the part ejection float 12 can be lower than the top surface of the lower template 2, without affecting the deburring process of the sheet metal part 3.

[0034] The lower mold plate 2 has two symmetrical rectangular slots at its top, and the lower mold outer positioning 14 is provided inside the rectangular slots. The sheet metal part 3 is disposed between the two lower mold outer positioning 14. The two lower mold outer positioning 14 are used to position the sheet metal part 3 and prevent the sheet metal part 3 from moving left or right during deburring.

[0035] The pressure plate 9 and the driving block 8 are both fixedly installed at the bottom of an upper mold base 15. The pressure plate 9 is located in the middle of the bottom surface of the upper mold base 15. The two driving blocks 8 are respectively located on the upper mold base 15 on both sides of the pressure plate 9. A first pressure plate insert 16 is connected to the lower part of the pressure plate 9. The top of the upper mold base 15 is connected to a lifting rod. The pressure plate 9, the driving block 8, and the upper mold base 15 all move up and down via the lifting rod.

[0036] Three first springs 17 are evenly spaced in the middle of the pressure plate 9, and two second pressure plate inserts 18 are symmetrically arranged below the pressure plate 9. The positions of the second pressure plate inserts 18 correspond to the outer positioning 14 of the lower mold, so that after the pressure plate 9 descends, the outer positioning 14 of the lower mold contacts the pressure plate inserts 18, preventing the sheet metal part 3 from moving left and right. At the same time, the three first springs 17 contact the top of the sheet metal part 3 as the pressure plate 9 descends, pressing the sheet metal part 3 against the top of the lower template 2 for fixation. The first springs 17 can extend and retract to adapt to the downward pressure height of the pressure plate 9, preventing damage to the sheet metal part 3. At the same time, when the ejection float 12 ejects the sheet metal part 3, it plays an auxiliary limiting role, preventing the ejection float 12 from bouncing the sheet metal part 3 too high and causing it to fall outside.

[0037] Each of the side-forming punches 7 has a motor 19 at one end facing the lower template 2. A grinding block 20 is detachably mounted on the output shaft of each motor 19. A controller 26 is located inside the lower mold base 1, and a switch 27 is located at the bottom of the through slot 25. The switch 27 and the motor 19 are connected to the controller 26. When the first spring 17 presses the sheet metal part 3 against the top of the lower template 2, the bottom of the ejection float 12 contacts the switch 27. The controller 26 then controls the motor 19 to work, using the grinding block 20 to deburr and grind the ejection float 12. The grinding block 20 can be replaced according to the model and size of the sheet metal part 3.

[0038] The two lower mold shaping inserts 4 have a circular hole in the middle. A first-type plum blossom coupling 51 is movably installed in the circular hole. A grinding disc 13 is fixed to the outside of the first-type plum blossom coupling 51. The output shaft end of the motor 19 is provided with a second-type plum blossom coupling 52 that is fitted and connected to the first-type plum blossom coupling 51. While the motor 19 drives the grinding block 20 to rotate, the first-type plum blossom coupling 51 and the second-type plum blossom coupling 52 are connected, driving the grinding disc 13 to rotate, thereby realizing the simultaneous grinding of the inner sides of the coaxial holes on both sides of the sheet metal part 3 and the opposite surfaces at both ends of the sheet metal part 3.

[0039] A method for shaping a U-shaped mounting ring for an automotive shock absorber based on a shaping device, as described above, includes the following steps:

[0040] S1. Place the sheet metal part 3 between the two lower mold outer positioning 14 at the top of the lower template 2;

[0041] S2. Start the lifting rod to drive the upper mold base 15 to descend. At the same time, the driving block 8 follows the upper mold base 15. The bottom inclined surface of the driving block 8 contacts the top inclined surface of the lower mold slider 22, thereby causing the lower mold slider 22 to move to the lower template 2 through the slide groove 21 and the slider 22.

[0042] S3. At the same time, the lower mold outer positioning 14 contacts the pressure plate insert 18 to prevent the sheet metal part 3 from moving left and right, thereby positioning the sheet metal part 3. The first spring 17 contacts the top of the sheet metal part 3 as the pressure plate 9 descends to fix the sheet metal part 3. The first plum blossom coupling 51 at the output end of the motor 19 is engaged with the second plum blossom coupling 52.

[0043] S4. As the first spring 17 descends, the ejector float 12 compresses the second spring 11 and descends accordingly. The bottom of the ejector float 12 contacts the switch 27. At the same time, the grinding block 20 of the side forming punch 7 contacts the sheet metal part 3. The controller 26 controls the motor 19 to work and grind the inner side of the hole on both sides of the sheet metal part 3 through the grinding block 20. At the same time, due to the connection of the first and second plum blossom couplings, the grinding disc grinds the inner side of the opposite surface of the sheet metal part 3, realizing the synchronous deburring and shaping of the inner side of the coaxial hole and the opposite surface of the sheet metal part 3.

[0044] S5. After grinding, the upper mold base 15 and the lower mold slider 22 are reset. The second spring 11 releases its elastic force to remove the part float 12, thereby completing the removal of the sheet metal part 3.

[0045] This invention can simultaneously process the inner walls of the two coaxial holes of the sheet metal part 3 of the U-shaped mounting ring of the automobile shock absorber, and simultaneously grind and shape the relatively inner side of the sheet metal part 3. The synchronization is high, which effectively improves the processing accuracy. In addition, the sheet metal part 3 is fixed in multiple directions with good fixing effect. Automatic material unloading can be achieved after processing, which improves processing efficiency.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sheet metal forming device, comprising a worktable, characterized in that, The workbench is equipped with a shaping device for deburring sheet metal parts (3). The shaping device is a three-sided deburring structure with downward linkage. The shaping device includes a mold structure for placing sheet metal parts (3). Both sides of the mold structure are equipped with grinding structures. The mold structure includes a lower template (2) and a pressure plate (9). Both sides of the pressure plate (9) are equipped with driving blocks (8). The bottom of the driving block (8) and the top of the corresponding grinding structure are tangent inclined surfaces. The driving block (8) and the grinding structure contact each other to form a deburring structure that moves synchronously towards the mold structure to grind the sheet metal parts (3) on the mold structure. The mold structure also includes a lower mold base (1), the lower template (2) is installed in the upper middle part of the lower mold base (1), the sheet metal part (3) is placed in the upper middle part of the lower template (2), and the lower template (2) has symmetrical slots on the front and back, and the slots are provided with lower mold shaping inserts (4). The pressure plate (9) and the drive block (8) are both fixedly installed at the bottom of an upper mold base (15). The first pressure plate insert (16) is connected to the bottom of the pressure plate (9), and the top of the upper mold base (15) is connected to a lifting rod. The lower template (2) has two rectangular slots symmetrically opened at the top, and the lower mold outer positioning (14) is provided inside the rectangular slots. The sheet metal part (3) is located between the two lower mold outer positioning (14). Two second pressure plate inserts (18) are symmetrically arranged below the pressure plate (9); Three first springs (17) are evenly spaced in the middle of the pressure plate (9); The lower template (2) is provided with a through groove (25) that runs through both sides and the top of the lower template (2). A part ejection float (12) is movably provided in the through groove (25). The bottom ends of the part ejection float (12) are symmetrically provided with second springs (11). The grinding structure includes lower mold sliders (22) located on both sides of the lower template (2). The top of the lower mold slider (22) is an inclined surface that is tangentially fitted to the drive block (8). The lower mold bases (1) on both sides of the lower template (2) are provided with grooves (21). The lower mold sliders (22) are slidably connected to the grooves (21). The two lower mold sliders (22) are provided with side shaping punches (7) on the side of the lower template (2) closer to the lower mold. The side shaping punch (7) is equipped with a motor (19) at one end facing the lower template (2). The output shaft of the motor (19) is detachably equipped with a grinding block (20). The lower mold base (1) is equipped with a controller (26). The bottom of the through groove (25) is equipped with a switch (27). The switch (27) and the motor (19) are respectively connected to the controller (26). The two lower mold shaping inserts (4) have a round hole in the middle, and a plum blossom coupling one (51) is movably installed in the round hole. A grinding disc (13) is fixed on the outside of the plum blossom coupling one (51). The output shaft end of the motor (19) is provided with a plum blossom coupling two (52) that is mutually fitted and connected with the plum blossom coupling one (51). The lifting rod is activated to drive the upper mold base (15) to descend. At the same time, the bottom slope of the upper mold base (15) and the driving block (8) comes into contact with the top slope of the lower mold slider (22), thereby causing the lower mold slider (22) to move to the lower template (2) through the slide groove (21). At the same time, the lower mold outer positioning (14) contacts the pressure plate insert (18) to prevent the sheet metal part (3) from moving left and right, and to achieve the positioning of the sheet metal part (3). The first spring (17) contacts the top of the sheet metal part (3) as the pressure plate (9) descends to fix the sheet metal part (3). The first plum blossom coupling (51) at the output end of the motor (19) is engaged and connected with the second plum blossom coupling (52). As the first spring (17) descends, the ejector float (12) compresses the second spring (11) and descends accordingly. The bottom of the ejector float (12) contacts the switch (27). At the same time, the grinding block (20) of the side forming punch (7) contacts the sheet metal part (3). The controller (26) controls the motor (19) to work and grind the inner side of the hole on both sides of the sheet metal part (3) through the grinding block (20). At the same time, due to the connection between the first and second plum blossom couplings, the grinding disc grinds the inner side of the opposite side of the sheet metal part (3).

2. A sheet metal shaping device according to claim 1, characterized in that: The pressure plate (9) is located in the middle of the bottom surface of the upper mold base (15), and the two drive blocks (8) are located on the upper mold base (15) on both sides of the pressure plate (9).

3. A method for shaping a U-shaped part based on the shaping device as described in any one of claims 1-2, characterized in that, The steps include the following: S1. Place the sheet metal part (3) between the two lower mold outer positioning (14) on the top of the lower template (2); S2. Start the lifting rod to drive the upper mold base (15) to descend. At the same time, the drive block (8) follows the upper mold base (15). The bottom slope of the drive block (8) contacts the top slope of the lower mold slider (22), thereby causing the lower mold slider (22) to move to the lower template (2) through the slide groove (21) and the slider (22). S3. At the same time, the lower mold outer positioning (14) contacts the pressure plate insert (18) to prevent the sheet metal part (3) from moving left and right, and to achieve the positioning of the sheet metal part (3). The first spring (17) contacts the top of the sheet metal part (3) as the pressure plate (9) descends to fix the sheet metal part (3). The first plum blossom coupling (51) at the output end of the motor (19) is engaged and connected with the second plum blossom coupling (52). S4. As the first spring (17) descends, the ejector float (12) compresses the second spring (11) and descends accordingly. The bottom of the ejector float (12) contacts the switch (27). At the same time, the grinding block (20) of the side forming punch (7) contacts the sheet metal (3). The controller (26) controls the motor (19) to work and grind the inner side of the hole on both sides of the sheet metal (3) through the grinding block (20). At the same time, due to the connection between the first and second plum blossom couplings, the grinding disc grinds the inner side of the opposite side of the sheet metal (3), realizing the synchronous deburring and shaping of the inner side of the coaxial hole and the opposite side of the sheet metal (3). S5. After grinding, the upper mold base (15) and the lower mold slider (22) are reset. The second spring (11) releases its elastic force to remove the part float (12), thereby removing the sheet metal part (3).

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