Moving mold repairing method of complex cavity injection mold

Abstract

The invention discloses a method for repairing a movable mold of a complex cavity injection mold, the movable mold comprises a movable mold arranged on the complex cavity injection mold, the movable mold comprises a movable mold main body and a plurality of movable mold splicing pieces arranged on the movable mold main body, the movable mold main body is provided with a movable mold main body cavity surface, and the movable mold main body is provided with a plurality of movable mold splicing pieces; movable mold splicing piece cavity surfaces are arranged on the movable mold splicing pieces, and the movable mold main body cavity surface on the movable mold main body and the splicing block cavity surfaces on the movable mold splicing pieces are spliced together to form a whole movable mold cavity surface; the movable mold repairing method comprises the following steps of (1) manufacturing of an injection mold, (2) assembling of the injection mold, (3) setting of a unified standard of mold repairing, (4) mold testing, (5) three-coordinate detection, (6) setting of error compensation, (7) partition planning of mold repairing processing, (8) overall mold repairing and (9) disassembly and mold repairing. The mold repairing frequency can be reduced, and the manufacturing efficiency and quality of the injection mold are improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection mold manufacturing, and in particular to a dynamic mold repairing method for a complex cavity injection mold. Background Art

[0002] An injection mold is a mold used for plastic injection molding, mainly used to manufacture plastic products of various shapes and sizes. It injects molten plastic into the cavity of the mold, and then solidifies and molds it through cooling to finally obtain the desired product. Injection molds play a vital role in the manufacturing industry and are widely used in automobiles, medical devices, electronics, home appliances, aerospace and other fields. The structure of the injection mold mainly includes a movable mold, a fixed mold and a pouring system. The movable mold and the fixed mold are respectively provided with a cavity surface. After the movable mold and the fixed mold are combined, an injection cavity for pouring is formed. The molten plastic is injected into the injection cavity through the pouring system. After cooling, mold opening and removal, the required plastic product is obtained.

[0003] For some plastic products with special structural shapes, the cavity surface on the movable mold may have a curved surface, which is a complex cavity surface. The cavity surface of this type of movable mold is difficult to process. In order to facilitate the processing of the complex cavity surface of the movable mold, the movable mold is usually set as a movable mold main body and a movable mold assembly (movable mold assembly) assembled on the movable mold main body during mold design, so as to facilitate the separate processing of the cavity surface on the movable mold main body and the cavity surface on the movable mold assembly, thereby reducing the difficulty of processing. In addition, based on the special shape of the plastic product, some movable molds are also separately provided with a movable mold top block or a movable mold inclined top.

[0004] However, due to machining errors, deformation errors, assembly errors and other reasons during the manufacturing process of the injection mold, the cavity surface after the injection mold is assembled will have certain errors, resulting in the size and shape of the parts after injection molding out of tolerance, and misalignment at the parting surface. For this reason, when manufacturing the injection mold, it is usually necessary to leave a machining allowance on the movable mold for trimming after errors occur in the mold assembly (this is called mold repair). Mold repair usually uses manual grinding and trimming, and it is necessary to repeatedly test the mold (trial casting) and repair the mold many times, which is time-consuming and labor-intensive, thereby extending the production cycle of the injection mold. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a dynamic mold repair method for complex cavity injection molds, aiming to reduce the number of mold repairs and improve the production efficiency and quality of injection molds. The specific technical solution is as follows: A method for repairing a dynamic mold of a complex cavity injection mold, comprising a dynamic mold arranged on the complex cavity injection mold, the dynamic mold comprising a dynamic mold main body and a number of dynamic mold assembly parts arranged on the dynamic mold main body, the dynamic mold main body is provided with a dynamic mold main body cavity surface for forming a part of the dynamic mold entire cavity surface, the dynamic mold assembly is provided with a dynamic mold assembly part cavity surface for forming another part of the dynamic mold entire cavity surface, the dynamic mold main body cavity surface on the dynamic mold main body and the assembly block cavity surfaces on each of the dynamic mold assembly parts are assembled together to form the entire cavity surface of the dynamic mold; the dynamic mold repairing method comprises the following steps: (1) Injection mold manufacturing: According to the design drawings of the complex cavity injection mold, the parts of the injection mold are manufactured; when manufacturing the movable mold assembly, it is important to leave sufficient mold repair processing allowances on the cavity surface of the movable mold main body and the cavity surface of the movable mold assembly; (2) Assembly of injection mold: After the parts of the injection mold are completed, the mold is assembled; the mold assembly includes the movable mold assembly and the fixed mold assembly respectively; (3) Establishment of a unified reference for mold repair: Place the assembled movable mold on a multi-axis CNC machining machine, and machine a cross groove reference on the movable mold body and each movable mold assembly; the cross groove includes a horizontal shallow groove machined along the X direction and a longitudinal shallow groove machined along the Y direction; (4) Mold testing: Install the injection mold on the injection molding machine for mold testing to obtain the injection molded specimen; (5) Three-coordinate testing: Place the injection molded specimen on the three-coordinate measuring machine to test the wall thickness error and the misalignment error of the parting surface; (6) Setting error compensation: setting wall thickness compensation data at a position where the wall thickness error of the injection molded specimen exceeds the tolerance; setting misalignment compensation data at a position where the misalignment error of the injection molded specimen exceeds the tolerance; trimming the three-dimensional model data for dynamic model cavity surface processing according to the wall thickness compensation data and the misalignment compensation data, and obtaining the trimmed three-dimensional model data for dynamic model cavity surface processing; (7) Mold repair processing zoning planning: the repair processing area of ​​the entire cavity surface of the movable mold is planned into an integral repair processing area and a plurality of disassembled repair processing areas; wherein the integral repair processing area is the cavity surface area that can be processed when the movable mold is not disassembled as a whole, including the cavity surface area on the movable mold body; the disassembled repair processing area is the cavity surface area that can only be processed after the movable mold is disassembled as a whole, including the cavity surface area on the movable mold assembly; (8) Overall mold repair: Place the entire movable mold on a multi-axis CNC machining machine, align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum, and then fix it; compile a machining program based on the 3D model data of the cavity surface of the modified movable mold, and perform cavity surface repair on the planned overall repair processing area; (9) Disassembly and mold repair: Disassemble the movable mold, and place the movable mold assembly that needs to be disassembled before processing its cavity surface area on a multi-axis CNC machining machine. Align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum and fix them; compile a machining program based on the three-dimensional model data of the dynamic mold cavity surface processing after repair, and perform cavity surface repair processing on the planned disassembly and repair processing area.

[0006] As one of the preferred solutions of the movable mold assembly in the present invention, the movable mold assembly includes a movable mold insert fixedly arranged on the movable mold body.

[0007] As a second preferred solution of the movable mold assembly in the present invention, the movable mold assembly includes a movable mold inclined top movably arranged on the movable mold body.

[0008] As a third preferred solution of the movable mold assembly in the present invention, the movable mold assembly includes a movable mold top block movably arranged on the movable mold body.

[0009] Preferably, the movable mold assembly includes a movable mold assembly with a parting surface and a movable mold assembly without a parting surface.

[0010] As one of the preferred solutions for setting the cross groove reference position in the present invention, for the movable mold assembly having a parting surface, the cross groove reference is located on the parting surface of the movable mold assembly.

[0011] As the second preferred solution for setting the cross groove reference position in the present invention, for the movable mold assembly having a parting surface, a reference block is provided on the outer side surface of the movable mold assembly close to the parting surface, and the cross groove reference is located on the reference block on the outer side surface of the movable mold assembly.

[0012] As a third preferred solution for setting the cross groove reference position in the present invention, for the movable mold assembly without a parting surface, the cross groove reference is located on the cavity surface of the movable mold assembly with a processing allowance.

[0013] Preferably, the cross groove datum located on the cavity surface of the movable mold assembly has the following structure: the transverse shallow groove of the cross groove datum is arranged at an equal depth along the cavity surface of the movable mold assembly in the X direction, and the longitudinal shallow groove of the cross groove datum is arranged at an equal depth along the cavity surface of the movable mold assembly in the Y direction.

[0014] Preferably, the movable mold is provided with a movable mold ejector pin, and a processing allowance is left on the top of the movable mold ejector pin when a single part is manufactured. The movable mold repairing method further includes a mold repairing method of the movable mold ejector pin, and the mold repairing method of the movable mold ejector pin includes the following contents: The following operation steps are added between step (2) assembling the injection mold and step (3) repairing the mold to unify the reference: S1. Moving mold ejector pin step difference detection: Place the assembled moving mold on the coordinate measuring instrument to detect the step difference between each moving mold ejector pin and the moving mold cavity surface; S2. Modeling of the step difference of the moving mold ejector blank: Based on the step difference data between each moving mold ejector and the cavity surface of the moving mold, a step difference model of each moving mold ejector on the moving mold is established using 3D software; S3. Moving mold ejector pin step difference trimming area planning: only the top step difference part of the moving mold ejector pin is delineated as the subsequent moving mold ejector pin step difference trimming area, and the moving mold ejector pin step difference trimming processing program is compiled according to the moving mold ejector pin step difference data; At the same time, in step (3) of setting up the unified datum for mold repair, before placing the assembled movable mold on the multi-axis CNC machining machine and before the cross groove datum machining, the following operation steps for trimming the step difference of the movable mold ejector pin are added: placing the entire movable mold on the multi-axis CNC machining machine, trimming the top step difference of the movable mold ejector pin to eliminate the step difference; At the same time, in the mold repair processing zone planning of step (7), the top end surface of the movable mold ejector is considered as a part of the movable mold cavity surface and is planned into the overall repair processing area, that is, the top end surface of the movable mold ejector is considered as the cavity surface area that can be processed when the movable mold is not disassembled as a whole; At the same time, in the overall mold repair step (8), when the cavity surface is repaired in the planned overall repair processing area, the top end surface of the movable mold ejector is also repaired.

[0015] The beneficial effects of the present invention are: First, a method for repairing a dynamic mold of a complex cavity injection mold of the present invention forms a unified reference for CNC machining and trimming by processing cross groove datums on the dynamic mold main body and each dynamic mold assembly, and combining CNC machining and trimming, thereby greatly reducing the number of mold repairs and improving the production efficiency and quality of the injection mold.

[0016] Second, the present invention provides a dynamic mold repair method for a complex cavity injection mold, which measures the injection molded specimen obtained during the mold trial through a three-coordinate measuring instrument, and compensates the measured injection molded specimen error into the subsequent dynamic mold repair processing procedure, thereby further improving the repair quality of the dynamic mold on the injection mold.

[0017] Third, the present invention provides a dynamic mold repair method for a complex cavity injection mold, and the mold repair processing is zoned to minimize the number of dynamic mold components that are processed separately, thereby further improving the overall dynamic mold repair quality.

[0018] Fourth, in a dynamic mold repair method of a complex cavity injection mold of the present invention, the cross groove datum is a three-dimensional cross groove datum having a shape adapted to the curved surface of the cavity, ensuring that the depth of the groove body used for alignment is shallow, thereby reducing the mold repair processing allowance and improving the mold repair efficiency. In addition, the reduction of the mold repair processing allowance is also conducive to improving the processing accuracy and surface quality of the mold repair.

[0019] Fifth, the present invention provides a dynamic mold repair method for a complex cavity injection mold, and the finishing process of the dynamic mold ejector is based on the pre-measured actual step difference data between the top end face of each dynamic mold ejector and the dynamic mold cavity surface for CNC programming (the conventional method is not to measure each dynamic mold ejector, and to leave more idle tool margin when compiling the processing program to avoid tool collision and ensure the safety of processing). Compared with the conventional dynamic mold ejector finishing process, the idle tool time caused by the top step difference processing of each dynamic mold ejector can be greatly reduced, thereby further improving the efficiency of the dynamic mold ejector finishing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic flow chart of a method for repairing a dynamic mold of a complex cavity injection mold of the present invention; Figure 2 It is a schematic diagram of setting a cross groove reference on the cavity surface of the movable mold assembly.

[0021] Figure 3 yes Figure 2 Z-direction view of the center cross slot datum.

[0022] In the figure: 1. The movable mold body or the movable mold assembly, 2. A horizontal shallow groove is processed along the X direction, and 3. A longitudinal shallow groove is processed along the Y direction. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0024] like Figures 1 to 3 The present invention shows an embodiment of a dynamic mold repair method for a complex cavity injection mold, comprising a dynamic mold arranged on a complex cavity injection mold, the dynamic mold comprising a dynamic mold main body and a plurality of dynamic mold assembly parts arranged on the dynamic mold main body, the dynamic mold main body is provided with a dynamic mold main body cavity surface for forming a part of the dynamic mold entire cavity surface, the dynamic mold assembly is provided with a dynamic mold assembly part cavity surface for forming another part of the dynamic mold entire cavity surface, the dynamic mold main body cavity surface on the dynamic mold main body and the assembly block cavity surfaces on each of the dynamic mold assembly parts are assembled together to form the entire cavity surface of the dynamic mold; the dynamic mold repair method comprises the following steps: (1) Injection mold manufacturing: According to the design drawings of the complex cavity injection mold, the parts of the injection mold are manufactured; when manufacturing the movable mold assembly, it is important to leave sufficient mold repair processing allowances on the cavity surface of the movable mold main body and the cavity surface of the movable mold assembly; (2) Assembly of injection mold: After the parts of the injection mold are completed, the mold is assembled; the mold assembly includes the movable mold assembly and the fixed mold assembly respectively; (3) Establishment of a unified reference for mold repair: Place the assembled movable mold on a multi-axis CNC machining machine, and machine a cross groove reference on the movable mold body and each movable mold assembly; the cross groove includes a horizontal shallow groove 2 machined along the X direction and a longitudinal shallow groove 3 machined along the Y direction; (4) Mold testing: Install the injection mold on the injection molding machine for mold testing to obtain the injection molded specimen; (5) Three-coordinate testing: Place the injection molded specimen on the three-coordinate measuring machine to test the wall thickness error and the misalignment error of the parting surface; (6) Setting error compensation: setting wall thickness compensation data at a position where the wall thickness error of the injection molded specimen exceeds the tolerance; setting misalignment compensation data at a position where the misalignment error of the injection molded specimen exceeds the tolerance; trimming the three-dimensional model data for dynamic model cavity surface processing according to the wall thickness compensation data and the misalignment compensation data, and obtaining the trimmed three-dimensional model data for dynamic model cavity surface processing; (7) Mold repair processing zoning planning: the repair processing area of ​​the entire cavity surface of the movable mold is planned into an integral repair processing area and a plurality of disassembled repair processing areas; wherein the integral repair processing area is the cavity surface area that can be processed when the movable mold is not disassembled as a whole, including the cavity surface area on the movable mold body; the disassembled repair processing area is the cavity surface area that can only be processed after the movable mold is disassembled as a whole, including the cavity surface area on the movable mold assembly; (8) Overall mold repair: Place the entire movable mold on a multi-axis CNC machining machine, align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum, and then fix it; compile a machining program based on the 3D model data of the cavity surface of the modified movable mold, and perform cavity surface repair on the planned overall repair processing area; (9) Disassembly and mold repair: Disassemble the movable mold, and place the movable mold assembly that needs to be disassembled before processing its cavity surface area on a multi-axis CNC machining machine. Align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum and fix them; compile a machining program based on the three-dimensional model data of the dynamic mold cavity surface processing after repair, and perform cavity surface repair processing on the planned disassembly and repair processing area.

[0025] As one of the preferred solutions of the movable mold assembly in this embodiment, the movable mold assembly includes a movable mold insert fixedly arranged on the movable mold body.

[0026] As a second preferred solution of the movable mold assembly in this embodiment, the movable mold assembly includes a movable mold inclined top movably arranged on the movable mold body.

[0027] As a third preferred solution of the movable mold assembly in this embodiment, the movable mold assembly includes a movable mold top block movably arranged on the movable mold body.

[0028] Preferably, the movable mold assembly includes a movable mold assembly with a parting surface and a movable mold assembly without a parting surface.

[0029] As one of the preferred solutions for setting the cross groove reference position in this embodiment, for the movable mold assembly having a parting surface, the cross groove reference is located on the parting surface of the movable mold assembly.

[0030] As the second preferred solution for setting the cross groove reference position in the present embodiment, for the movable mold assembly having a parting surface, a reference block is provided on the outer side surface of the movable mold assembly close to the parting surface, and the cross groove reference is located on the reference block on the outer side surface of the movable mold assembly.

[0031] As the third preferred solution for setting the cross groove reference position in this embodiment, for the movable mold assembly without a parting surface, the cross groove reference is located on the cavity surface of the movable mold assembly with a processing allowance.

[0032] Preferably, the cross groove datum located on the cavity surface of the movable mold assembly has the following structure: the transverse shallow groove of the cross groove datum is arranged at an equal depth along the cavity surface of the movable mold assembly in the X direction, and the longitudinal shallow groove of the cross groove datum is arranged at an equal depth along the cavity surface of the movable mold assembly in the Y direction.

[0033] Preferably, the movable mold is provided with a movable mold ejector pin, and a processing allowance is left on the top of the movable mold ejector pin when a single part is manufactured. The movable mold repairing method further includes a mold repairing method of the movable mold ejector pin, and the mold repairing method of the movable mold ejector pin includes the following contents: The following operation steps are added between step (2) assembling the injection mold and step (3) repairing the mold to unify the reference: S1. Moving mold ejector pin step difference detection: Place the assembled moving mold on the coordinate measuring instrument to detect the step difference between each moving mold ejector pin and the moving mold cavity surface; S2. Modeling of the step difference of the moving mold ejector blank: Based on the step difference data between each moving mold ejector and the cavity surface of the moving mold, a step difference model of each moving mold ejector on the moving mold is established using 3D software; S3. Moving mold ejector pin step difference trimming area planning: only the top step difference part of the moving mold ejector pin is delineated as the subsequent moving mold ejector pin step difference trimming area, and the moving mold ejector pin step difference trimming processing program is compiled according to the moving mold ejector pin step difference data; At the same time, in step (3) of setting up the unified datum for mold repair, before placing the assembled movable mold on the multi-axis CNC machining machine and before the cross groove datum is processed, the following operation steps for trimming the step difference of the movable mold ejector pin are added: placing the entire movable mold on the multi-axis CNC machining machine, trimming the top step difference of the movable mold ejector pin to eliminate the step difference; At the same time, in the mold repair processing zone planning of step (7), the top end surface of the movable mold ejector is considered as a part of the movable mold cavity surface and is planned into the overall repair processing area, that is, the top end surface of the movable mold ejector is considered as the cavity surface area that can be processed when the movable mold is not disassembled as a whole; At the same time, in the overall mold repair step (8), when the cavity surface is repaired in the planned overall repair processing area, the top end surface of the movable mold ejector is also repaired.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for repairing a dynamic mold of a complex cavity injection mold, characterized in that: The invention comprises a movable mold arranged on a complex cavity injection mold, the movable mold comprising a movable mold body and a plurality of movable mold assembly parts arranged on the movable mold body, the movable mold body is provided with a movable mold body cavity surface for forming a part of the cavity surface of the entire cavity surface of the movable mold, the movable mold assembly parts are provided with a movable mold assembly part cavity surface for forming another part of the cavity surface of the entire cavity surface of the movable mold, and the movable mold body cavity surface on the movable mold body and the assembly part cavity surfaces on each of the movable mold assembly parts are assembled together to form the entire cavity surface of the movable mold; the movable mold repairing method comprises the following steps: (1) Injection mold manufacturing: According to the design drawings of the complex cavity injection mold, the parts of the injection mold are manufactured; when manufacturing the movable mold assembly, it is important to leave sufficient mold repair processing allowances on the cavity surface of the movable mold main body and the cavity surface of the movable mold assembly; (2) Assembly of injection mold: After the parts of the injection mold are completed, the mold is assembled; the mold assembly includes the movable mold assembly and the fixed mold assembly respectively; (3) Establishment of a unified reference for mold repair: Place the assembled movable mold on a multi-axis CNC machining machine, and machine a cross groove reference on the movable mold body and each movable mold assembly; the cross groove includes a horizontal shallow groove machined along the X direction and a longitudinal shallow groove machined along the Y direction; (4) Mold testing: Install the injection mold on the injection molding machine for mold testing to obtain the injection molded specimen; (5) Three-coordinate testing: Place the injection molded specimen on the three-coordinate measuring machine to test the wall thickness error and the misalignment error of the parting surface; (6) Setting error compensation: setting wall thickness compensation data at a position where the wall thickness error of the injection molded specimen exceeds the tolerance; setting misalignment compensation data at a position where the misalignment error of the injection molded specimen exceeds the tolerance; trimming the three-dimensional model data for dynamic model cavity surface processing according to the wall thickness compensation data and the misalignment compensation data, and obtaining the trimmed three-dimensional model data for dynamic model cavity surface processing; (7) Mold repair processing zoning planning: the repair processing area of ​​the entire cavity surface of the movable mold is planned into an integral repair processing area and a plurality of disassembled repair processing areas; wherein the integral repair processing area is the cavity surface area that can be processed when the movable mold is not disassembled as a whole, including the cavity surface area on the movable mold body; the disassembled repair processing area is the cavity surface area that can only be processed after the movable mold is disassembled as a whole, including the cavity surface area on the movable mold assembly; (8) Overall mold repair: Place the entire movable mold on a multi-axis CNC machining machine, align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum, and then fix it; compile a machining program based on the 3D model data of the cavity surface of the modified movable mold, and perform cavity surface repair on the planned overall repair processing area; (9) Disassembly and mold repair: Disassemble the movable mold, and place the movable mold assembly that needs to be disassembled before processing its cavity surface area on a multi-axis CNC machining machine. Align the X and Y directions of the cross groove datum and the XY coordinate center point of the cross groove datum and fix them; compile a machining program based on the three-dimensional model data of the dynamic mold cavity surface processing after repair, and perform cavity surface repair processing on the planned disassembly and repair processing area.

2. The method for repairing a dynamic mold of a complex cavity injection mold according to claim 1, characterized in that: The movable mold assembly comprises a movable mold insert fixedly arranged on the movable mold body.

3. The method for repairing a dynamic mold of a complex cavity injection mold according to claim 1, characterized in that: The movable mold assembly comprises a movable mold inclined top movably arranged on the movable mold body.

4. The method for repairing a movable mold of a complex cavity injection mold according to claim 1, characterized in that: The movable mold assembly comprises a movable mold top block movably arranged on the movable mold body.

5. The method for repairing a movable mold of a complex cavity injection mold according to claim 1, characterized in that: The movable mold assembly includes a movable mold assembly with a parting surface and a movable mold assembly without a parting surface.

6. The method for repairing a dynamic mold of a complex cavity injection mold according to claim 5, characterized in that: For the movable mold assembly having a parting surface, the cross groove reference is located on the parting surface of the movable mold assembly.

7. The method for repairing a dynamic mold of a complex cavity injection mold according to claim 5, characterized in that: For the movable mold assembly having a parting surface, a reference block is arranged on the outer side surface of the movable mold assembly close to the parting surface, and the cross groove reference is located on the reference block on the outer side surface of the movable mold assembly.

8. The method for repairing a movable mold of a complex cavity injection mold according to claim 5, characterized in that: For the movable mold assembly without a parting surface, the cross groove reference is located on the cavity surface of the movable mold assembly with a processing allowance.

9. The method for repairing a movable mold of a complex cavity injection mold according to claim 8, characterized in that: The cross groove datum located on the cavity surface of the movable mold assembly has the following structure: the transverse shallow groove of the cross groove datum is arranged at the same depth along the cavity surface of the movable mold assembly in the X direction, and the longitudinal shallow groove of the cross groove datum is arranged at the same depth along the cavity surface of the movable mold assembly in the Y direction.

10. The method for repairing a movable mold of a complex cavity injection mold according to claim 1, characterized in that: The movable mold is provided with a movable mold ejector pin, and a processing allowance is left on the top of the movable mold ejector pin when a single part is manufactured. The movable mold repairing method also includes a mold repairing method of the movable mold ejector pin, and the mold repairing method of the movable mold ejector pin includes the following contents: The following operation steps are added between step (2) assembling the injection mold and step (3) repairing the mold to unify the reference: S1. Moving mold ejector pin step difference detection: Place the assembled moving mold on the coordinate measuring instrument to detect the step difference between each moving mold ejector pin and the moving mold cavity surface; S2. Modeling of the step difference of the moving mold ejector blank: Based on the step difference data between each moving mold ejector and the cavity surface of the moving mold, a step difference model of each moving mold ejector on the moving mold is established using 3D software; S3. Moving mold ejector pin step difference trimming area planning: only the top step difference part of the moving mold ejector pin is delineated as the subsequent moving mold ejector pin step difference trimming area, and the moving mold ejector pin step difference trimming processing program is compiled according to the moving mold ejector pin step difference data; At the same time, in step (3) of setting up the unified datum for mold repair, before placing the assembled movable mold on the multi-axis CNC machining machine and before the cross groove datum machining, the following operation steps for trimming the step difference of the movable mold ejector pin are added: placing the entire movable mold on the multi-axis CNC machining machine, trimming the top step difference of the movable mold ejector pin to eliminate the step difference; At the same time, in the mold repair processing zone planning of step (7), the top end surface of the movable mold ejector is considered as a part of the movable mold cavity surface and is planned into the overall repair processing area, that is, the top end surface of the movable mold ejector is considered as the cavity surface area that can be processed when the movable mold is not disassembled as a whole; At the same time, in the overall mold repair step (8), when the cavity surface is repaired in the planned overall repair processing area, the top end surface of the movable mold ejector is also repaired.

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