Grinding device and grinding process for sheet-type stamped parts

Abstract

This application relates to a grinding apparatus and grinding process for sheet-type stamped parts. The grinding apparatus for sheet-type stamped parts comprises a machine tool body, which is equipped with a worktable and a grinding wheel. The worktable has a placement platform for placing workpieces. The placement platform includes a mounting plate connected to the worktable and a receiving seat connected to the upper surface of the mounting plate. The upper surface of the receiving seat is used to receive the workpiece. The lower surface of the receiving seat has an upward-facing mounting groove, and the inner wall of the mounting groove is equipped with an adsorption component for adsorbing the workpiece. The upper surface of the receiving seat has a downward-facing guide hole, and the inner wall of the guide hole is slidably connected to a lifting rod for abutting against the lower surface of the workpiece. The mounting plate is equipped with an elastic abutment member for pushing the lifting rod upward. The elastic abutment member cooperates with the lifting rod to automatically separate the workpiece from the upper surface of the receiving seat, facilitating the removal of the processed workpiece.

Description

Technical Field

[0001] This application relates to the field of grinding technology, and in particular to a grinding apparatus and grinding process for sheet-shaped stamped parts. Background Technology

[0002] Sheet stamping refers to thin, flat parts formed from metal sheets through stamping. After stamping, the surface of the workpiece needs to be ground using a grinding machine to make the surface flat.

[0003] A surface grinder, also known as a grinding device, is disclosed in related technologies. It includes a machine body with a worktable and a grinding head. A grinding wheel is rotatably connected to the grinding head and is driven to rotate by a motor. The worktable has a placement platform for placing workpieces and a fixing structure for securing the workpieces. The height of the grinding head can be adjusted up and down via a handwheel to adjust the height of the grinding wheel, thereby facilitating contact between the grinding wheel and the workpiece surface for grinding. The worktable can be moved along the length or width of the machine tool via the handwheel, allowing the workpiece to move relative to the grinding wheel along the length or width of the machine tool, enabling the grinding wheel to perform grinding on various parts of the workpiece surface. Because sheet-shaped stamped parts are relatively thin, coolant is generally sprayed onto the grinding wheel during grinding to cool both the grinding wheel and the sheet-shaped stamped part, reducing the possibility of deformation.

[0004] Regarding the aforementioned technologies, the inventors believe that during the grinding process, coolant can flow to the position between the sheet-shaped stamping and the placement table, improving the sealing between the sheet-shaped stamping and the placement table, making it difficult to separate the sheet-shaped stamping from the placement table. At this time, it is necessary to use a thin metal sheet to pry up the processed sheet-shaped stamping on the worktable, which is a rather cumbersome operation and therefore needs to be improved. Summary of the Invention

[0005] The purpose of this application is to provide a grinding apparatus and grinding process for sheet-shaped stamping parts, so as to facilitate the removal of the sheet-shaped stamping parts after grinding.

[0006] Firstly, the grinding apparatus for sheet-shaped stamped parts provided in this application adopts the following technical solution:

[0007] A grinding device for sheet-shaped stamped parts includes a machine tool body, the machine tool body being provided with a worktable and a grinding wheel; the worktable being provided with a placement platform for placing workpieces; the placement platform includes a mounting plate connected to the worktable and a receiving seat connected to the upper surface of the mounting plate; the upper surface of the receiving seat is used to receive the workpiece; the lower surface of the receiving seat is provided with an upwardly extending mounting groove, and the inner sidewall of the mounting groove is provided with an adsorption component for adsorbing the workpiece; the upper surface of the receiving seat is provided with a downwardly extending guide hole, and the inner sidewall of the guide hole is slidably connected to a lifting rod for abutting against the lower surface of the workpiece; the mounting plate is provided with an elastic abutment member for pushing the lifting rod upward.

[0008] By adopting the above technical solution, when installing the workpiece, the workpiece is placed on the upper wall of the lifting rod; then the workpiece is pressed down so that the adsorption component can adsorb the workpiece, making the lower surface of the workpiece fit against the upper surface of the receiving seat, and causing the lifting rod to retract into the guide hole, and the elastic abutment component to undergo elastic deformation. After the workpiece grinding is completed, the adsorption component releases the workpiece, and the elastic abutment component pushes the lifting rod upward, so that the lifting rod lifts the workpiece upward, thereby automatically separating the workpiece from the upper surface of the receiving seat. This reduces the need to use tools to pry the workpiece up, making the operation more convenient and labor-saving.

[0009] Optionally, the adsorption assembly includes a magnetic core, an upper magnetic plate connected to one end of the magnetic core, and an electromagnetic coil wound around the peripheral wall of the magnetic core; the upper surface of the upper magnetic plate is in contact with the inner top wall of the mounting groove.

[0010] By adopting the above technical solution, when the electromagnetic coil is energized, the magnetic core and the upper magnetic plate are magnetized, thereby attracting the workpiece to the upper surface of the receiving base. After the workpiece is processed, the electromagnetic coil is de-energized, the upper magnetic plate is demagnetized, and the lifting rod can then lift the workpiece. The use of the electromagnetic coil to magnetize and demagnetize the upper magnetic plate facilitates automatic control.

[0011] Optionally, the mounting plate is provided with a lower magnetic guide plate, which is connected to the end of the magnetic core away from the upper magnetic guide plate; the lifting rod is made of ferromagnetic material; and the lower magnetic guide plate is provided with an adsorption column for adsorbing the lifting rod.

[0012] By adopting the above technical solution, when the workpiece pushes downward against the lifting rod, the adsorption column can adsorb the lifting rod to fix it, reducing the upward force exerted by the lifting rod on the workpiece. This reduces the possibility of the workpiece detaching from the upper surface of the receiving seat, thereby improving the stability of the connection between the workpiece and the receiving seat. After the workpiece is processed, the electromagnetic coil is de-energized, and the adsorption column automatically demagnetizes, allowing the lifting rod to separate from the adsorption column.

[0013] Optionally, the lifting rod is provided with a downwardly extending docking post, the docking post being made of ferromagnetic material; the adsorption post is provided with a docking groove for interlocking with the docking post.

[0014] By adopting the above technical solution, the docking column and the docking groove are inserted and matched, which helps to increase the contact area between the lifting rod and the adsorption column, thereby improving the stability of the connection between the lifting rod and the adsorption column.

[0015] Optionally, a guide ring is provided at the lower end of the lifting rod, and a guide cylinder is provided along the circumference of the lower magnetic plate and the docking column, with the guide ring slidingly connected to the inner wall of the guide cylinder.

[0016] By adopting the above technical solution, the guide ring and the guide cylinder slide together. This helps reduce the possibility of the lifting rod tilting due to magnetic attraction, thereby improving the stability of the lifting rod's up-and-down sliding and reducing the risk of the lifting rod jamming.

[0017] Optionally, the upper surface of the receiving seat is provided with a ventilation groove along the length or width of the receiving seat itself; the workpiece is covered on the ventilation groove.

[0018] By adopting the above technical solution, the venting groove can reduce the contact area between the workpiece and the upper surface of the receiving seat, thereby reducing the magnitude of the adsorption force between the workpiece and the receiving seat, thus facilitating the separation of the workpiece from the receiving seat.

[0019] Optionally, the bottom wall of the venting groove is provided with a vent hole facing downward; the receiving seat is provided with an air inlet hole that communicates with all the vent holes, and the inner side wall of the air inlet hole is connected to an air inlet pipe for venting air into the air inlet hole, and the air inlet pipe is connected to a control valve for controlling its own on and off; the control valve and the adsorption assembly are electrically connected to a controller.

[0020] By adopting the above technical solution, when the controller controls the adsorption component to release the workpiece, the controller simultaneously controls the control valve to open so that the air inlet pipe can blow air into the air inlet hole; the gas blows the air inlet hole upward and pushes the workpiece upward, thereby further facilitating the separation of the workpiece from the receiving seat.

[0021] Optionally, all of the lifting rods are connected to a connecting frame, and all of the lifting rods can move upward or downward synchronously.

[0022] By adopting the above technical solution, when the workpiece moves downward along the lifting rod that it is in contact with, the other lifting rods can move downward synchronously, so that all the lifting rods are retracted into the guide hole, thereby reducing the possibility of the grinding wheel contacting the lifting rods during the movement of the worktable.

[0023] Optionally, the inner wall of the guide hole is provided with a sealing ring groove along its circumference, and a sealing ring is embedded in the sealing ring groove; the inner circumferential wall of the sealing ring fits against the circumferential wall of the lifting rod.

[0024] By adopting the above technical solution, the sealing ring can improve the sealing performance between the lifting rod and the inner wall of the guide hole, reduce the possibility of grinding debris or coolant entering the guide hole, and help ensure the stability of the sliding of the lifting rod relative to the inner wall of the guide hole and ensure the dryness of the installation groove.

[0025] Secondly, the grinding process for a sheet-type stamped part provided in this application adopts the following technical solution:

[0026] A grinding process for a sheet-shaped stamped part, using the aforementioned grinding apparatus for sheet-shaped stamped parts, includes the following steps:

[0027] Rough grinding of the front side: Grinding the front side of the workpiece while leaving machining allowance;

[0028] Reverse fine grinding: After rough grinding on the front side, the reverse side of the workpiece is finely ground to make it smooth and leave machining allowance.

[0029] Front surface fine grinding: After the back surface fine grinding, the front surface of the workpiece is ground to make it flat and the thickness of the workpiece is processed to the specified size.

[0030] By adopting the above technical solution, the lifting rod and the elastic abutment work together to facilitate the automatic separation of the plate-shaped stamped part after grinding from the receiving seat, thereby making it easier to remove the finished workpiece.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. After the workpiece is ground, the adsorption component releases the workpiece, and the elastic abutment component drives the push lifting rod to automatically separate the workpiece from the upper surface of the receiving seat, reducing the need to use tools to pry the workpiece up, thus making it easier to remove the finished workpiece.

[0033] 2. When the upper magnetic plate is magnetized to attract the workpiece, the adsorption column is simultaneously magnetized to attract the lifting rod, thereby reducing the upward force exerted by the lifting rod on the workpiece and improving the stability of the connection between the workpiece and the receiving seat.

[0034] 3. After the workpiece is processed, the controller can control the control valve to automatically blow air into the air inlet through the air inlet pipe, thereby increasing the upward force on the workpiece and further facilitating the separation of the workpiece from the worktable. Attached Figure Description

[0035] Figure 1This is a schematic diagram of the overall structure of a grinding device for a sheet-type stamped part according to an embodiment of this application.

[0036] Figure 2 This is a schematic diagram used to demonstrate the structure of the display stand.

[0037] Figure 3 It is along Figure 2 A cross-sectional view of line AA in the diagram.

[0038] Figure 4 yes Figure 3 Enlarged view of part B in the image.

[0039] Figure 5 It is along Figure 2 Cross-sectional view of the CC line.

[0040] Figure 6 yes Figure 5 Enlarged view of part D in the image.

[0041] In the diagram, 1. Machine tool body; 11. Worktable; 111. Clamping block; 12. Machine head; 121. Grinding wheel; 122. Drive motor; 13. Horizontal adjustment handwheel; 14. Vertical adjustment handwheel; 15. Vertical adjustment handwheel; 2. Placement table; 21. Mounting plate; 211. Embedding groove; 22. Receiving seat; 221. Receiving groove; 2211. Limiting groove; 222. Fixing rod; 2221. Limiting block; 2222. Connecting block; 223. Mounting groove; 224. Guide hole; 2241. Sealing ring groove 2242, Sealing ring; 225, Vent groove; 2251, Vent hole; 226, Air inlet; 227, Air inlet pipe; 2271, Connecting pipe; 2272, Control valve; 3, Adsorption assembly; 31, Magnetic core; 32, Upper magnetic plate; 321, Clearance hole; 33, Electromagnetic coil; 4, Lower magnetic plate; 41, Insertion groove; 42, Guide cylinder; 421, Elastic abutment; 43, Adsorption column; 431, Docking groove; 5, Lifting rod; 51, Guide ring; 52, Docking column; 53, Connecting frame. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0043] A grinding device for sheet-shaped stamped parts, with reference to Figure 1The system includes a machine tool body 1, which is equipped with a worktable 11 and a machine head 12, with the machine head 12 located above the worktable 11. The worktable 11 can slide along the length direction of the machine tool body 1 and also slide along the width direction of the machine tool body 1. The machine head 12 can slide up and down. The machine head 12 is equipped with a grinding wheel 121 and a drive motor 122. The axial direction of the grinding wheel 121 is set along the width direction of the machine tool body 1. The grinding wheel 121 is rotatably connected to the machine head 12, and the drive motor 122 is fixedly connected to the machine head 12. The output shaft of the drive motor 122 is connected to the rotating shaft of the grinding wheel 121 to drive the grinding wheel 121 to rotate.

[0044] Reference Figure 1 The machine tool body 1 is equipped with a horizontal adjustment handwheel 13, a vertical adjustment handwheel 14, and a vertical adjustment handwheel 15. Rotating the horizontal adjustment handwheel 13 allows the worktable 11 to slide along the length of the machine tool body 1; rotating the vertical adjustment handwheel 14 allows the worktable 11 to slide along the width of the machine tool body 1; rotating the vertical adjustment handwheel 15 allows the machine head 12 to slide upwards or downwards. The transmission structures between the horizontal adjustment handwheel 13 and the worktable 11, the vertical adjustment handwheel 14 and the worktable 11, and the vertical adjustment handwheel 15 and the machine head 12 are all disclosed in related technologies and will not be described in detail in this embodiment.

[0045] Reference Figure 1 The upper surface of the workbench 11 is provided with a placement platform 2, which includes a mounting plate 21 and a receiving seat 22. The lower surface of the mounting plate 21 is in contact with the upper surface of the workbench 11. Multiple clamping blocks 111 are arranged sequentially along the circumference of the mounting plate 21 on the workbench 11. The clamping blocks 111 abut against the upper surface of the mounting plate 21 and are fixed to the workbench 11 by screws, so that the mounting plate 21 is fixed to the workbench 11.

[0046] Reference Figure 2 and Figure 3 The upper surface of the mounting plate 21 has a downward-facing embedding groove 211, into which the lower end of the receiving seat 22 is embedded. The outer wall of the lower side of the receiving seat 22 has a receiving groove 221, the inner wall of which is in contact with the lower surface of the receiving seat 22. A fixing rod 222 is embedded in the receiving groove 221, and the side walls of the fixing rod 222 along the width direction of the receiving groove 221 are integrally formed with limiting blocks 2221; the inner wall of the receiving groove 221 has a limiting groove 2211 that engages with the limiting blocks 2221. A connecting block 2222 is welded to the lower end of the fixing rod 222, and the connecting block 2222 is fixed to the mounting plate 21 by screws, so that the lower surface of the receiving seat 22 abuts against the bottom wall of the embedding groove 211.

[0047] Reference Figure 3The lower surface of the receiving seat 22 has an upward-facing mounting groove 223, and the inner wall of the mounting groove 223 is provided with an adsorption assembly 3. The adsorption assembly 3 includes a magnetic core 31, an upper magnetic plate 32, and an electromagnetic coil 33. The upper magnetic plate 32 is fixed to the inner top wall of the mounting groove 223 by screws, and the upper surface of the upper magnetic plate 32 is in contact with the inner top wall of the mounting groove 223. There are multiple magnetic cores 31, one end of each magnetic core 31 is welded and fixed to the lower surface of the upper magnetic plate 32, and the other end extends downward. There are multiple electromagnetic coils 33, and each electromagnetic coil 33 corresponds one-to-one with a magnetic core 31, with each electromagnetic coil 33 sleeved on the peripheral wall of the corresponding magnetic core 31.

[0048] Reference Figure 2 and Figure 3 The mounting plate 21 is provided with a lower magnetic guide plate 4, which is located within the embedding groove 211 and is fixedly connected to the bottom wall of the embedding groove 211 by screws. The upper surface of the lower magnetic guide plate 4 at the position of each magnetic core 31 has a downward-facing insertion groove 41, and the lower end of each magnetic core 31 is inserted into the corresponding insertion groove 41. The upper surface of the receiving seat 22 has a downward-facing guide hole 224, which is arranged in a matrix. The upper magnetic guide plate 32 has a clearance hole 321 at the position of each guide hole 224. A lifting rod 5 is inserted through the guide hole 224 and is slidably connected to the inner wall of the guide hole 224. A guide cylinder 42 is welded and fixed to the upper surface of the lower magnetic guide plate 4 at the position of each lifting rod 5.

[0049] Reference Figure 3 and Figure 4 A guide ring 51 is welded and fixed to the peripheral wall of the lower end of the lifting rod 5. The guide ring 51 is aligned with the corresponding guide cylinder 42, and each guide ring 51 is located inside the corresponding guide cylinder 42 and is slidably connected to the inner side wall of the corresponding guide cylinder 42 to improve the stability of the sliding fit between the lifting rod 5 and the guide hole 224. An elastic abutment 421 is provided inside the guide cylinder 42, and the elastic abutment 421 includes a spring. One end of the elastic abutment 421 abuts against the lower magnetic plate 4, and the other end is sleeved on the lower end of the lifting rod 5 and abuts against the corresponding guide ring 51. During processing, the workpiece is placed on the upper surface of the receiving seat 22 so that the lower surface of the workpiece contacts the upper end wall of the lifting rod 5; then the workpiece is pressed, and the workpiece can push the lifting rod 5 downward to cause the elastic abutment 421 to undergo elastic deformation. In another embodiment, the lower end of the elastic abutment 421 can also directly abut against the mounting plate 21.

[0050] Reference Figure 4The magnetic core 31, upper magnetic plate 32, and lower magnetic plate 4 are all made of silicon steel. The electromagnetic coil 33 is connected to a controller (not shown in the figure) via wires. The controller includes a PLC. The controller supplies power to the electromagnetic coil 33 to magnetize the magnetic core 31, upper magnetic plate 32, and lower magnetic plate 4. This allows the upper magnetic plate 32 to attract the workpiece, so that the lower surface of the workpiece is pressed tightly against the upper surface of the receiving seat 22, thereby fixing the workpiece for grinding. In another embodiment, the magnetic core 31, upper magnetic plate 32, and lower magnetic plate 4 can also be made of other magnetizable materials.

[0051] Reference Figure 4 Each guide cylinder 42 has an adsorption column 43 welded and fixed to its upper surface inside the lower magnetic plate 4. The upper end wall of the adsorption column 43 has a downward-facing docking groove 431. The material of the adsorption column 43 is the same as that of the lower magnetic plate 4, so that the adsorption column 43 and the lower magnetic plate 4 can be magnetized synchronously. The lower end wall of the lifting rod 5 is integrally formed with a docking column 52. The material of the docking column 52 and the lifting rod 5 is both ferromagnetic. The docking column 52 can be inserted into the docking groove 431 so that the adsorption column 43 can adsorb and fix the lifting rod 5, thereby allowing the upper end of the lifting rod 5 to be separated from the workpiece, so as to improve the stability of the workpiece fixation.

[0052] Reference Figure 4 A connecting frame 53 is provided in the mounting slot 223. The connecting frame 53 is welded and fixed to the upper end of all the lifting rods 5 so that the upper ends of all the lifting rods 5 can move down synchronously into the guide hole 224, thereby reducing the possibility of the lifting rods 5 interfering with the grinding process.

[0053] Reference Figure 4 A sealing ring groove 2241 is formed on the inner wall of the guide hole 224, and the sealing ring groove 2241 is formed along the axial direction of the guide hole 224. A sealing ring 2242 is embedded in the sealing ring groove 2241; the inner peripheral wall of the sealing ring 2242 fits against the peripheral wall of the lifting rod 5 to improve the sealing performance between the lifting rod 5 and the inner wall of the guide hole 224, and reduce the possibility of grinding debris or coolant entering the guide hole 224. The sealing ring 2242 includes a rubber ring.

[0054] Reference Figure 5 and Figure 6The upper surface of the receiving seat 22, located between two adjacent sets of guide holes 224, is provided with venting grooves 225 for the workpiece to be placed on the venting grooves 225. The venting grooves 225 are opened along the length of the receiving seat 22, and each end of the venting groove 225 is through-hole. The bottom wall of each venting groove 225 has downward-facing venting holes 2251, and multiple venting holes 2251 are spaced apart along the length of the venting groove 225. The end wall of one end of the receiving seat 22 has multiple air inlets 226, which are opened along the length of the venting groove 225, and each air inlet 226 corresponds to a venting groove 225; each air inlet 226 communicates with all the venting holes 2251 of the corresponding venting groove 225. In another embodiment, the ventilation groove 225 may be opened along the width direction of the receiving seat 22, or the receiving seat 22 may be opened along both its width and length directions.

[0055] Reference Figure 5 and Figure 6 Each vent hole has an inlet pipe 227 threaded onto its inner wall. All inlet pipes 227 are connected to a connecting pipe 2271 via a common conduit. A control valve 2272, including a solenoid valve, is connected to the end of the connecting pipe 2271 furthest from the inlet pipe 227. The inlet end of the control valve 2272 is connected to an air compressor (not shown in the figure), and the control valve 2272 is connected to a controller via a wire. After the workpiece is processed, the controller opens the control valve 2272, allowing gas to be introduced into the vent hole through the connecting pipe 2271 via the inlet pipe 227. The gas can be blown upwards through the vent hole 2251 towards the lower surface of the workpiece, thereby pushing the workpiece upwards and further facilitating separation of the workpiece from the upper surface of the receiving seat 22.

[0056] This embodiment discloses a grinding process for sheet-shaped stamped parts, which uses the grinding apparatus for sheet-shaped stamped parts disclosed in this embodiment, and includes the following steps:

[0057] S1, Rough grinding on the front:

[0058] S11. Install the workpiece: The controller controls the electromagnetic coil 33 to be energized; place the workpiece on the upper surface of the receiving seat 22 and make the reverse side of the workpiece contact the upper end wall of the lifting rod 5; then press the workpiece so that the reverse side of the workpiece is pressed tightly against the upper surface of the receiving seat 22.

[0059] S12. Grind the front side of the workpiece so that any position on the front side of the workpiece is ground by grinding wheel 121, leaving a machining allowance of 1.5~2.5mm.

[0060] S13. Disassembling the workpiece: The controller controls the electromagnetic coil 33 to be de-energized, and the connecting pipe 2271 blows air into the air inlet pipe 227; the lifting rod 5 automatically lifts the workpiece.

[0061] S2, Reverse side fine grinding:

[0062] S21. Install the workpiece: Referring to step S11, clamp the workpiece that has completed the rough grinding of the front side onto the upper surface of the receiving seat 22, and make the front side of the workpiece fit tightly against the upper surface of the receiving seat 22.

[0063] S22. Grind the reverse side of the workpiece so that any position on the reverse side of the workpiece is ground by grinding wheel 121, leaving a machining allowance of 0.3~0.5mm.

[0064] S23. Disassemble the workpiece: Same as step S13;

[0065] S3, Front surface finely polished:

[0066] S31. Install the workpiece: Referring to step S11, clamp the workpiece that has been finely ground on the reverse side onto the upper surface of the receiving seat 22, and make the reverse side of the workpiece fit tightly against the upper surface of the receiving seat 22.

[0067] S32. Grind the front side of the workpiece to make the thickness of the workpiece reach the required value.

[0068] S33. Disassemble the workpiece: Same as step S13.

[0069] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grinding apparatus for sheet-shaped stamped parts, comprising a machine tool body (1), wherein the machine tool body (1) is provided with a worktable (11) and a grinding wheel (121); the worktable (11) is provided with a placement table (2) for placing workpieces; characterized in that: The placement platform (2) includes a mounting plate (21) connected to the worktable (11) and a receiving seat (22) connected to the upper surface of the mounting plate (21); the upper surface of the receiving seat (22) is used to receive the workpiece; the lower surface of the receiving seat (22) is provided with an upward mounting groove (223), and the inner wall of the mounting groove (223) is provided with an adsorption assembly (3) for adsorbing the workpiece; the upper surface of the receiving seat (22) is provided with a downward penetrating guide hole (224), and the inner wall of the guide hole (224) is slidably connected with a lifting rod (5) for abutting against the lower surface of the workpiece; the mounting plate (21) is provided with an elastic abutment (421) for pushing the lifting rod (5) upward; the adsorption assembly (3) includes a magnetic core (31), an upper magnetic plate (32) connected to one end of the magnetic core (31), and a magnetic core (31) wound around the magnetic core (31). The electromagnetic coil (33) on the periphery of the upper magnetic plate (32) is attached to the inner top wall of the mounting groove (223). The mounting plate (21) is provided with a lower magnetic plate (4). The lower magnetic plate (4) is connected to the end of the magnetic core (31) away from the upper magnetic plate (32). The lifting rod (5) is made of ferromagnetic material. The lower magnetic plate (4) is provided with an adsorption column (43) for adsorbing the lifting rod (5). The lifting rod (5) is provided with a downwardly extending docking column (52). The adsorption column (43) is provided with a docking groove (431) for interlocking with the docking column (52). The lower end of the lifting rod (5) is provided with a guide ring (51). The lower magnetic plate (4) is provided with a guide cylinder (42) along the circumference of the docking column (52). The guide ring (51) is slidably connected to the inner side wall of the guide cylinder (42).

2. The apparatus for grinding a sheet-shaped stamping according to claim 1, characterized in that: The upper surface of the receiving seat (22) is provided with a ventilation groove (225) along the length or width of the receiving seat (22); the workpiece is covered on the ventilation groove (225).

3. The apparatus for grinding a sheet-shaped stamping according to claim 2, characterized in that: The bottom wall of the ventilation groove (225) is provided with a ventilation hole (2251) facing downward; the receiving seat (22) is provided with an air inlet (226) that communicates with all the ventilation holes (2251); the inner side wall of the air inlet (226) is connected to an air inlet pipe (227) for breathing into the air inlet (226); the air inlet pipe (227) is connected to a control valve (2272) for controlling its own opening and closing; the control valve (2272) and the adsorption assembly (3) are electrically connected to a controller.

4. The apparatus for grinding a sheet punch according to claim 1, wherein: All of the lifting rods (5) are connected to a connecting frame (53), and all of the lifting rods (5) can move up or down synchronously.

5. The apparatus for grinding a sheet punch according to claim 1, wherein: The inner sidewall of the guide hole (224) is provided with a sealing ring groove (2241) along its circumference, and a sealing ring (2242) is embedded in the sealing ring groove (2241); the inner circumferential wall of the sealing ring (2242) is in contact with the circumferential wall of the lifting rod (5).

6. A grinding process for a sheet-type stamping, characterized by: The grinding apparatus for sheet-shaped stamped parts as described in any one of claims 1 to 5 includes the following steps: Rough grinding of the front side: Grinding the front side of the workpiece while leaving machining allowance; Reverse fine grinding: After rough grinding on the front side, fine grinding is performed on the reverse side of the workpiece to make the reverse side of the workpiece flat and leave machining allowance; Front surface fine grinding: After the back surface fine grinding, the front surface of the workpiece is ground to make it flat and the thickness of the workpiece is processed to the specified size.

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