Grinding Process for Irregular Forming Blocks in a Hot Forming Die

Abstract

The present invention discloses a grinding process for irregular forming blocks in hot forming dies, which relates to the technical field of hot forming processes. S11. Before grinding the forming block, it is transformed into a non-standard forming block; S12. Grind each surface of the non-standard forming block; The steps for transforming the forming block before grinding in step S11 include: constructing a flat adjustment surface on the parting surface of the forming block, and constructing a plurality of process support feet on the forming surface of the forming block; wherein, the adjustment surface, the bottom surface and the assembly surface on the forming block form three-sided reference planes for the forming block during CNC finish milling operation. The present invention pre-constructs an adjustment surface before the parting surface of the forming block is formed, providing three mutually perpendicular reference planes for the forming block during the CNC finish milling process; pre-constructs process support feet on the forming surface of the forming block. During the grinding process, the process support feet ensure the stability of the positioning of the forming block and also improve the accuracy of the flatness of the bottom surface grinding process.

Description

Technical Field

[0001] The present invention relates to the technical field of hot forming processes, and particularly relates to a grinding process for irregular forming blocks in a hot forming die. Background Art

[0002] Generally, the shapes of hot formed products are irregular and the lengths vary from 500 mm to 2200 mm. For the convenience of hot forming die processing and later maintenance, the weight of a single hot forming die should not be too large. Therefore, the hot forming die must be split into several forming blocks with similar lengths as much as possible according to the characteristics of the hot formed product.

[0003] The manufacturing of the forming block needs to go through the following steps: ① cutting the blank - ② CNC rough milling - ③ heat treatment - ④ grinding - ⑤ CNC finish milling; considering the later maintenance cost and the convenience of disassembly and assembly of the forming block, the split length and width dimensions of a single forming block workpiece are usually controlled within 250 mm * 250 mm, and the volume should not be too large.

[0004] Figures 1 - 2 Shown is a forming block 101, which includes an irregular forming surface 101b at the top, a bottom surface 204 located at the bottom of the forming surface 101b, an assembly surface 205 located between the forming surface 101b and the bottom surface 204, and a parting surface 101a located on the adjacent side of the assembly surface 205; wherein, the parting surface 101a has an uneven surface with a concavo-convex structure.

[0005] Currently, in the ④ grinding process, the forming block 101 encounters the following technical problems during the ④ grinding process:

[0006] 1. When the forming block 101 undergoes ⑤ CNC finish milling, it is necessary to ensure that the forming block 101 has three mutually perpendicular reference planes, and the flatness and perpendicularity of the three reference planes are required to be very small (within 0 - 0.03 mm); however, the forming block 101 currently does not have three mutually perpendicular reference planes;

[0007] 2. When the forming block 101 undergoes grinding, precise positioning is required. Especially when grinding the bottom surface 204, it is necessary to clamp and fix the forming surface 101b of the forming block 101 in advance. Due to the irregularity of the forming surface 101b, it is impossible to accurately fix the forming surface 101b of the forming block 101, which not only affects the positioning stability of the forming block 101, but also affects the flatness accuracy of the bottom surface 204 after grinding.

[0008] Therefore, how to solve the above problems is an urgent technical problem that needs to be solved by those skilled in the art currently.

[0009] The information disclosed in this background section is only intended to enhance the overall understanding of the background of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0010] In view of the above technical problems, an embodiment of the present invention provides a grinding process for irregular forming blocks in a hot forming die to solve the problems presented in the above background section.

[0011] The present invention provides the following technical solutions:

[0012] A grinding process for irregular forming blocks in a hot forming die, comprising:

[0013] S11. Before grinding the forming block, transform it into a non-standard forming block;

[0014] S12. Grind each surface of the non-standard forming block;

[0015] The steps for transforming the forming block before grinding in step S11 include: constructing a flat adjustment surface on the parting surface of the forming block and constructing a plurality of process support feet on the forming surface of the forming block;

[0016] Among them, the adjustment surface, the bottom surface, and the assembly surface on the forming block form a three-sided reference for the forming block during CNC precision milling operation; the process support feet are used as the support surface for the bottom surface of the forming block during grinding operation.

[0017] Preferably, there are four process support feet, and the four process support feet are respectively fixed at the four corner positions of the forming surface.

[0018] Preferably, the steps for grinding each surface of the non-standard forming block in S12 include:

[0019] S31. Grind the process support feet;

[0020] Place the non-standard forming block on the electromagnetic workbench of the grinding machine, with the bottom surface of the non-standard forming block attached to the electromagnetic workbench of the grinding machine; place the permanent magnetic tooling close to the non-standard forming block on the electromagnetic workbench of the grinding machine, with the permanent magnetic chuck of the permanent magnetic tooling attached to the assembly surface of the non-standard forming block;

[0021] Turn on the permanent magnetic tooling and the electromagnetic workbench of the grinding machine respectively, so that both the non-standard forming block and the permanent magnetic tooling are adsorbed on the electromagnetic workbench of the grinding machine; the grinding wheel works to perform equal-height grinding on the end faces of the plurality of process support feet;

[0022] S32. Grind the bottom surface;

[0023] Flip the non-standard forming block in step S by 180°, and place the process support feet downward on the electromagnetic workbench of the grinding machine; place the permanent magnetic tooling on the electromagnetic workbench of the grinding machine, and the permanent magnetic chuck of the permanent magnetic tooling is attached to the assembly surface of the non-standard forming block;

[0024] Turn on the permanent magnetic tooling and the electromagnetic workbench of the grinding machine respectively, so that the non-standard forming block and the permanent magnetic tooling are both adsorbed on the electromagnetic workbench of the grinding machine; the grinding wheel works to grind the bottom surface;

[0025] S33. Grind the assembly surface;

[0026] Flip the non-standard forming block in step S32 by 90°, so that an assembly surface of the non-standard forming block is attached to the electromagnetic workbench of the grinding machine; place the permanent magnetic tooling on the electromagnetic workbench of the grinding machine, and the permanent magnetic chuck of the permanent magnetic tooling is attached to the bottom surface of the non-standard forming block;

[0027] Turn on the permanent magnetic tooling and the electromagnetic workbench of the grinding machine respectively, so that the non-standard forming block and the permanent magnetic tooling are both adsorbed on the electromagnetic workbench of the grinding machine; the grinding wheel works to grind the assembly surface;

[0028] Among them, after the grinding of the first assembly surface is completed, flip the non-standard forming block by 180°, so that the other assembly surface of the non-standard forming block is attached to the electromagnetic workbench of the grinding machine, and then repeat the operation in step S33 to grind the other assembly surface;

[0029] S34. Grind the adjustment surface;

[0030] Rotate the non-standard forming block in step S33 by 90°, so that an adjustment surface of the non-standard forming block is attached to the electromagnetic workbench of the grinding machine, place the permanent magnetic tooling on the electromagnetic workbench of the grinding machine, and the permanent magnetic chuck of the permanent magnetic tooling is attached to the bottom surface of the non-standard forming block;

[0031] Turn on the permanent magnetic tooling and the electromagnetic workbench of the grinding machine respectively, so that the non-standard forming block and the permanent magnetic tooling are both adsorbed on the electromagnetic workbench of the grinding machine; the grinding wheel works to grind the adjustment surface;

[0032] Among them, after the grinding of the first adjustment surface is completed, flip the non-standard forming block by 180°, so that the other adjustment surface of the non-standard forming block is attached to the electromagnetic workbench of the grinding machine, and then repeat the operation in step S34 to grind the other adjustment surface to complete the grinding operation.

[0033] Preferably, in step S31, after heat treatment of the non-standard forming block, there is a deformation error within 0.2 mm. The bottom surface and the assembly surface of the non-standard forming block cannot be well attracted to the permanent magnetic chuck on the permanent magnetic tooling and the tooling bottom surface on the permanent magnetic tooling at the same time. It is necessary to pad thin paper at the gap between the bottom surface of the non-standard forming block and the tabletop of the electromagnetic workbench of the grinding machine to make the assembly surface well attracted to the surface of the permanent magnetic chuck.

[0034] Preferably, in step S32, since the process support feet are relatively small, there may be a gap between the contact surface of the process support feet and the surface of the electromagnetic workbench of the grinding machine. A hammer needs to be used to gently strike the bottom surface to ensure that the gap between the contact surface of the process support feet and the surface of the electromagnetic workbench of the grinding machine is eliminated.

[0035] Preferably, in step S33, equal-height blocks are padded between the assembly surface and the surface of the electromagnetic workbench of the grinding machine, so that the top surface of the assembly surface is higher than the top surface of the permanent magnetic tooling, which is convenient for the grinding wheel to work.

[0036] Preferably, in step S34, to ensure that the adjustment surface, the bottom surface, and the assembly surface are perpendicular respectively, a lever dial indicator needs to be used to check and adjust the perpendicularity between the assembly surface and the surface of the electromagnetic workbench of the grinding machine.

[0037] Preferably, the permanent magnetic tooling is in a right-angled shape, including a tooling bottom surface and a permanent magnetic adsorption surface, and a permanent magnetic chuck is fixedly arranged on the permanent magnetic adsorption surface.

[0038] The grinding process for the irregular forming block in the hot forming die provided by the embodiment of the present invention has the following beneficial effects: The present invention pre-constructs an adjustment surface before the parting surface of the forming block is formed, providing three mutually perpendicular reference planes for the forming block in the CNC precision milling process; a process support foot is pre-constructed on the forming surface of the forming block. In the grinding process, the process support foot ensures the stability of the positioning of the forming block and also improves the accuracy of the flatness of the bottom surface grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the forming block at angle one in the present invention;

[0040] Figure 2 It is a schematic structural diagram of the forming block at angle two in the present invention;

[0041] Figure 3 It is a schematic structural diagram of the non-standard forming block at angle one in the present invention;

[0042] Figure 4 It is a schematic structural diagram of the non-standard forming block at angle two in the present invention;

[0043] Figure 5 It is a schematic structural diagram of the permanent magnetic tooling in the present invention;

[0044] Figure 6 It is a demonstration diagram of the grinding process support feet in the present invention;

[0045] Figure 7 It is a demonstration diagram of the grinding bottom surface in the present invention;

[0046] Figure 8 It is a demonstration diagram of the grinding assembly surface in the present invention;

[0047] Figure 9 It is a demonstration diagram of the grinding adjustment surface in the present invention;

[0048] Figure 10 It is a schematic structural diagram of the equal-height block in the present invention;

[0049] Figure 11 It is a three-dimensional structural schematic diagram of the grinding process support foot in the present invention. Specific Embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0051] Refer to Figures 1 - 11 。

[0052] In view of the problems mentioned in the above background technology, the embodiments of the present invention provide a grinding process for irregular forming blocks in a hot forming die to solve the above technical problems, and the technical solutions are as follows:

[0053] A grinding process for an irregular forming block 101 in a hot forming die, including:

[0054] S11. Before grinding the forming block 101, it is transformed into a non-standard forming block 201;

[0055] S12. Grind each surface of the non-standard forming block 201;

[0056] The steps for transforming the forming block 101 before grinding in step S11 include: constructing a flat adjustment surface 203 on the parting surface 101a of the forming block 101, and constructing a plurality of process support feet 206 on the forming surface 101b of the forming block 101;

[0057] Among them, the adjustment surface 203, the bottom surface 204, and the assembly surface 205 on the forming block 101 form a three-sided reference for the forming block 101 during CNC finish milling operation; the three-sided reference can be understood as: the bottom surface 204, the assembly surface 205, and the adjustment surface 203 are perpendicular to each other;

[0058] The process support foot 206 serves as the support surface for the bottom surface 204 of the forming block 101 during grinding operation; the process support foot 206 is parallel and at the same height as the end surface of the bottom surface 204.

[0059] It should be noted that the adjustment surface 203 and the process support feet 206 are both completed in the ② CNC rough milling process. The addition of the adjustment surface 203 not only enables the forming block 101 to have three mutually perpendicular reference planes, but also makes the forming block 101 more stable when placed on the grinding machine workbench. The adjustment surface 203 will be cut off by wire cutting after the ⑤ CNC finish milling process. The process support feet 206 are only used in the ④ grinding process to ensure the positioning stability of the forming block 101 and also improve the flatness accuracy of the bottom surface 204 after grinding. In the ⑤ CNC finish milling process, the process support feet 206 will be cut off.

[0060] In this embodiment, the steps of grinding each surface of the non-standard forming block in S12 include:

[0061] S31. Grind the process support feet 206;

[0062] Figure 6 As shown, place the non-standard forming block 201 on the electromagnetic workbench 402 of the grinding machine, with the bottom surface 204 of the non-standard forming block 201 attached to the electromagnetic workbench 402 of the grinding machine; place the permanent magnet tooling 301 close to the non-standard forming block 201 on the electromagnetic workbench 402 of the grinding machine, and the permanent magnet chuck 302 of the permanent magnet tooling 301 is attached to the assembly surface 205 of the non-standard forming block 201;

[0063] Turn on the permanent magnet tooling 301 and the electromagnetic workbench 402 of the grinding machine respectively, so that both the non-standard forming block 201 and the permanent magnet tooling 301 are adsorbed on the electromagnetic workbench 402 of the grinding machine; the grinding wheel 501 works to perform equal-height grinding on the end face of the process support feet 206;

[0064] S32. Grind the bottom surface 204;

[0065] As Figure 7 shown, turn the non-standard forming block 201 in step S31 by 180°, and place the process support feet 206 downward on the electromagnetic workbench 402 of the grinding machine; place the permanent magnet tooling 301 on the electromagnetic workbench 402 of the grinding machine, and the permanent magnet chuck 302 of the permanent magnet tooling 301 is attached to the assembly surface 205 of the non-standard forming block 201;

[0066] Turn on the permanent magnet tooling 301 and the electromagnetic workbench 402 of the grinding machine respectively, so that both the non-standard forming block 201 and the permanent magnet tooling 301 are adsorbed on the electromagnetic workbench 402 of the grinding machine; the grinding wheel 501 works to grind the bottom surface 204;

[0067] S33. Grind the assembly surface 205;

[0068] As Figure 8As shown in the figure, turn the non-standard forming block 201 in step S32 by 90°, so that an assembling surface 205 of the non-standard forming block 201 is attached to the electromagnetic workbench 402 of the grinding machine; place the permanent magnetic tooling 301 on the electromagnetic workbench 402 of the grinding machine, and the permanent magnetic chuck 302 of the permanent magnetic tooling 301 is attached to the bottom surface 204 of the non-standard forming block 201;

[0069] Turn on the permanent magnetic tooling 301 and the electromagnetic workbench 402 of the grinding machine respectively, so that both the non-standard forming block 201 and the permanent magnetic tooling 301 are adsorbed on the electromagnetic workbench 402 of the grinding machine; the grinding wheel 501 works to grind the assembling surface 205;

[0070] Among them, after the grinding of the first assembling surface 205 is completed, turn the non-standard forming block 201 by 180°, so that the other assembling surface 205 of the non-standard forming block 201 is attached to the electromagnetic workbench 402 of the grinding machine, and then repeat the operation in step S33 to grind the other assembling surface 205;

[0071] S34. Grind the adjusting surface 203;

[0072] As Figure 9 shown in the figure, rotate the non-standard forming block 201 in step S33 by 90°, so that an adjusting surface 203 of the non-standard forming block 201 is attached to the electromagnetic workbench 402 of the grinding machine, place the permanent magnetic tooling 301 on the electromagnetic workbench 402 of the grinding machine, and the permanent magnetic chuck 302 of the permanent magnetic tooling 301 is attached to the bottom surface 204 of the non-standard forming block 201;

[0073] Turn on the permanent magnetic tooling 301 and the electromagnetic workbench 402 of the grinding machine respectively, so that both the non-standard forming block 201 and the permanent magnetic tooling 301 are adsorbed on the electromagnetic workbench 402 of the grinding machine; the grinding wheel 501 works to grind the adjusting surface 203;

[0074] Among them, after the grinding of the first adjusting surface 203 is completed, turn the non-standard forming block 201 by 180°, so that the other adjusting surface 203 of the non-standard forming block 201 is attached to the electromagnetic workbench 402 of the grinding machine, and then repeat the operation in step S34 to grind the other adjusting surface 203 to complete the grinding operation.

[0075] In this embodiment, in step S31, after heat treatment of the non-standard forming block 201, there is a deformation error within 0.2 mm. The bottom surface 204 and the assembling surface 205 of the non-standard forming block 201 cannot be well attracted to the permanent magnetic chuck 302 on the permanent magnetic tooling 301 and the tooling bottom surface 307 on the permanent magnetic tooling 301 at the same time. It is necessary to pad thin paper sheets (generally, the paper sheet thickness is 0.06 - 0.08 mm) at the gap between the bottom surface 204 of the non-standard forming block 201 and the table surface of the electromagnetic workbench 402 of the grinding machine, so that the assembling surface 205 is well attracted to the surface of the permanent magnetic chuck 302.

[0076] In this embodiment, in step S32, since the process support leg 206 is relatively small, there may be a gap between the contact surface of the process support leg 206 and the surface of the electromagnetic workbench 402 of the grinding machine. A hammer needs to be used to gently strike the bottom surface 204 to ensure that the gap between the contact surface of the process support leg 206 and the surface of the electromagnetic workbench 402 of the grinding machine is eliminated.

[0077] In this embodiment, in step S33, an equal-height block 601 is padded between the assembly surface 205 and the surface of the electromagnetic workbench 402 of the grinding machine, so that the top surface of the assembly surface 205 is higher than the top surface of the permanent magnetic tooling 301, which is convenient for the grinding wheel 501 to work.

[0078] In this embodiment, in step S34, to ensure that the adjustment surface 203, the bottom surface 204, and the assembly surface 205 are perpendicular to each other respectively, it is necessary to check and adjust the perpendicularity between the assembly surface 205 and the surface of the electromagnetic workbench 402 of the grinding machine with a lever dial indicator (minimum scale 0.01 mm).

[0079] In this embodiment, the permanent magnetic tooling 301 is in a right-angled shape, including a tooling bottom surface 307 and a permanent magnetic adsorption surface, and a permanent magnetic chuck 302 is fixedly arranged on the permanent magnetic adsorption surface; the permanent magnetic chuck 302 and the tooling bottom surface 307 must be perpendicularly installed, and the perpendicularity error is within 0.01 mm.

[0080] A rear longitudinal beam laser cutting fixture provided by an embodiment of the present invention has the following beneficial effects: The present invention pre-constructs an adjustment surface before the parting surface of the forming block is formed, providing three mutually perpendicular reference planes for the forming block in the CNC precision milling process; a process support leg is pre-constructed on the forming surface of the forming block. In the grinding process, the process support leg ensures the stability of the forming block positioning and also improves the accuracy of the flatness of the bottom surface grinding process.

[0081] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units. They may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "set", "connected", "fixed", "swiveling connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solution of the present invention and the concept of the present invention, and all such changes or replacements shall fall within the protection scope of the claims appended to the present invention.

Claims

1. A grinding process for irregularly shaped blocks in a thermoforming mold, characterized in that: include: S11, transforming the forming block before grinding, transforming the forming block into a non-standard forming block; S12, grinding each surface of the non-standard forming block; The step of modifying the forming block before grinding in step S11 includes: constructing a flat adjustment surface on the parting surface of the forming block, and constructing a plurality of process support feet on the forming surface of the forming block; Among them, the adjustment surface, the bottom surface and the assembly surface on the forming block constitute the three-surface reference of the forming block during CNC fine milling operation; the process support foot is used as the support surface of the bottom surface of the forming block during grinding operation; The process support feet include four, and the four process support feet are respectively fixed at the four corners of the forming surface; The steps of grinding each surface of the non-standard forming block in S12 include: S31, grinding process support foot; The non-standard forming block is placed on the electromagnetic workbench of the grinder, and the bottom surface of the non-standard forming block is attached to the electromagnetic workbench of the grinder; the permanent magnetic fixture is placed close to the non-standard forming block on the electromagnetic workbench of the grinder, and the permanent magnetic chuck of the permanent magnetic fixture is attached to the assembly surface of the non-standard forming block; The permanent magnetic fixture and the electromagnetic worktable of the grinder are turned on respectively, so that the non-standard forming block and the permanent magnetic fixture are adsorbed on the electromagnetic worktable of the grinder; the grinding wheel performs equal-height grinding on the end faces of multiple process support legs; S32, grinding bottom surface; The non-standard formed block in step S31 is turned over 180 degrees, and the process support feet are placed on the electromagnetic workbench of the grinder with the workpiece facing downward; the permanent magnetic fixture is placed on the electromagnetic workbench of the grinder, and the permanent magnetic chuck of the permanent magnetic fixture is attached to the assembly surface of the non-standard formed block; The permanent magnetic fixture and the electromagnetic workbench of the grinder are turned on respectively, so that the non-standard forming block and the permanent magnetic fixture are adsorbed on the electromagnetic workbench of the grinder; the grinding wheel is used to grind the bottom surface; S33, grinding assembly surface; The non-standard formed block in step S32 is turned over 90 degrees, so that one assembly surface of the non-standard formed block is attached to the electromagnetic workbench of the grinder; the permanent magnetic fixture is placed on the electromagnetic workbench of the grinder, and the permanent magnetic chuck of the permanent magnetic fixture is attached to the bottom surface of the non-standard formed block; The permanent magnetic fixture and the electromagnetic workbench of the grinder are turned on respectively, so that the non-standard forming block and the permanent magnetic fixture are adsorbed on the electromagnetic workbench of the grinder; the grinding wheel is used to grind the assembly surface; After the grinding of the first assembly surface is completed, the non-standard formed block is turned 180 degrees, so that the other assembly surface of the non-standard formed block is attached to the electromagnetic workbench of the grinder, and then the operation in step S33 is repeated to grind the other assembly surface; S34, grinding adjustment surface; The non-standard forming block in step S33 is rotated 90° so that one adjustment surface of the non-standard forming block is attached to the electromagnetic workbench of the grinder, and the permanent magnetic fixture is placed on the electromagnetic workbench of the grinder, and the permanent magnetic chuck of the permanent magnetic fixture is attached to the bottom surface of the non-standard forming block; The permanent magnetic fixture and the electromagnetic workbench of the grinder are turned on respectively, so that the non-standard forming block and the permanent magnetic fixture are adsorbed on the electromagnetic workbench of the grinder; the grinding wheel is used to grind the adjustment surface; When the grinding of the first adjustment surface is completed, the non-standard forming block is flipped 180° so that the other adjustment surface of the non-standard forming block is attached to the electromagnetic workbench of the grinder, and then the operation in step S34 is repeated to grind the other adjustment surface to complete the grinding operation.

2. The grinding process of irregularly shaped blocks in a thermoforming mold according to claim 1, characterized in that: In step S31, the non-standard forming block has a deformation error of less than 0.2mm after heat treatment, and the bottom surface and assembly surface of the non-standard forming block cannot be well attracted with the permanent magnetic suction cup on the permanent magnetic tooling and the bottom surface of the tooling on the permanent magnetic tooling at the same time. It is necessary to pad a thin paper sheet in the gap between the bottom surface of the non-standard forming block and the surface of the electromagnetic worktable of the grinder to make the assembly surface and the surface of the permanent magnetic suction cup attract well.

3. The grinding process of irregularly shaped blocks in a thermoforming mold according to claim 1, characterized in that: In step S32, since the process support foot is small, there is a gap between the contact surface of the process support foot and the electromagnetic worktable surface of the grinder, and a hammer is used to tap the bottom surface to ensure that the gap between the contact surface of the process support foot and the electromagnetic worktable surface of the grinder is eliminated.

4. The grinding process of irregularly shaped blocks in a thermoforming mold according to claim 1, characterized in that: In step S33, equal height blocks are placed between the assembly surface and the electromagnetic worktable of the grinder, so that the top surface of the assembly surface is higher than the top surface of the permanent magnetic fixture, which is convenient for the grinding wheel to work.

5. The grinding process of irregularly shaped blocks in a thermoforming mold according to claim 1, characterized in that: In step S34, in order to ensure that the adjustment surface, the bottom surface and the assembly surface are respectively vertical, it is necessary to check and adjust the verticality of the assembly surface and the electromagnetic worktable surface of the grinder by using a lever dial indicator.

6. The grinding process of irregularly shaped blocks in a thermoforming mold according to claim 1, characterized in that: The permanent magnetic fixture is in a right-angle shape, and comprises a fixture bottom surface and a permanent magnetic adsorption surface, on which a permanent magnetic suction cup is fixedly arranged.

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