WO2022041464A1

WO2022041464A1 - Preparation method for rectifier module frame cover

Info

Publication number: WO2022041464A1
Application number: PCT/CN2020/124797
Authority: WO
Inventors: 陈银波; 邵如根; 蔡宏泉
Original assignee: 扬州四菱电子有限公司
Priority date: 2020-08-27
Filing date: 2020-10-29
Publication date: 2022-03-03
Also published as: CN111823496B; CN111823496A

Abstract

A preparation method for a rectifier module frame cover (1), the method comprising: (1) adjusting and testing different rectifier module frame cover (1) test specimens by using a shaping tool, so as to determine a reverse deformation stroke S_final; and (2) when a relevant rectifier module frame cover (1) is injected by means of an injection molding machine, firstly removing sprue-opening burrs by using the shaping tool, then placing the rectifier module frame cover (1) on a shaping device, with the back face of the rectifier module frame cover (1) facing upwards, and applying pressure to the rectifier module frame cover (1) by means of a manual press (3), such that the rectifier module frame cover is reversely deformed, with the reverse deformation stroke being S_final, thereby completely offsetting the deformation amount of the rectifier module frame cover (1) that has cooled and contracted. This solution solves the problem of the rectifier module frame cover (1) distorting and deforming after cooling.

Description

A kind of preparation method of rectifier module frame cover

technical field

The invention belongs to the technical field of rectifier modules, and in particular relates to a preparation method of a frame cover of a rectifier module.

Background technique

At present, the raw material of the rectifier module shell is PBT, which is prepared by the injection molding process. After production, a part of the shell will be deformed and twisted during the cooling process due to structural problems. Therefore, it is necessary to improve the existing preparation method, so that the casing frame cover is flat, and there is no gap when matching with the corresponding matching parts.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for preparing a frame cover of a rectification module, so as to solve the technical problem of deformation and distortion caused by the existing method for preparing a frame cover of a finishing module.

In order to solve the above technical problems, the present invention adopts the following technical solutions, a method for preparing a rectifier module frame cover, the rectifier module frame cover includes a cover plate, and two grooves are evenly distributed on the top surface of the cover plate, and the grooves are along the width direction of the cover plate. set; it is characterized in that, described preparation method is:

(1) Use the shaping tool to debug the frame cover test samples of different rectifier modules, and determine the _end of the reverse deformation stroke S

(1-1) Fill the hopper of the injection molding machine with the raw materials of the rectifier module frame cover, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, 225°C for the third stage, injection pressure: 45MPa, Holding pressure 40MPa; start injection molding;

(1-2) Select the rectifier module frame cover injected by the injection molding machine as the test sample. The rectifier module frame cover test sample removes the glue and burrs. At this time, the surface temperature of the rectifier module frame cover test sample is 180-220°C; Shape the test sample of the frame cover of the rectifier module;

The shaping tool includes a manual press and a shaping positioning plate. The manual press includes a base, a support rod is arranged on the base, a machine head is set on the support rod, a punch rod and a pressure handle are arranged on the machine head, and the rotation of the pressure handle drives the punch rod to move up and down. ;The lower end of the punching rod is provided with a punching head, the upper part of the punching rod is provided with a stroke plate, a limit bolt is set on the stroke plate, and the limit bolt is located under the stroke plate; a punching rod reset device is set on the machine head;

A shaping positioning plate is fixed on the base of the manual press, and a punching groove is machined on the shaping positioning plate, and the punching slot is located directly under the punching head; at this time, the stroke of the shaping tool is the distance between the bottom of the limit bolt and the top plate of the machine head, Recorded as the _beginning of S;

Place the test sample of the rectifier module frame cover face down on the shaping positioning plate, and press the test sample of the rectifier module frame cover down by a manual press to reverse the deformation of the rectifier module frame cover test sample, which is used to offset the cooling of the rectifier module frame cover shrinkage deformation;

(1-3) After the rectifier module frame cover test sample to be deformed in reverse is cooled, match the cooled rectifier module frame cover test sample with the matching rectifier module frame, and check whether there is a gap at the joint to judge the direction of the rectifier module. Whether the magnitude of the downward pressure is appropriate, specifically: If the middle of the test sample of the rectifier module frame cover bulges upwards and there is a gap in the middle, it proves that the reverse deformation stroke of the experiment is greater than the S _end , and the limit bolt is moved down to reduce the stroke of the shaping tool;

If the middle of the test sample of the rectifier module frame cover is concave downward, and the two ends are raised upward, there are gaps at both ends, which proves that the reverse deformation stroke of the experiment is smaller than the S _end , and the limit adjustment bolt is moved upward to increase the stroke of the shaping tool;

(1-4) By adjusting the position of the limit bolt of the manual press to control the pressing stroke of the manual press, repeat steps (1-2) and (1-3) on the test samples of the frame cover of different rectifier modules until the shaping After cooling, the test sample of the frame cover of the rectifier module is completely straight. At this time, the limit bolt is fastened, and the stroke of the manual press is the distance between the bottom of the limit bolt and the top plate of the machine head, which is recorded as S _end ;

(2) Continuous preparation of non-deformation rectifier module frame cover

(2-1) Fill the hopper of the injection molding machine with the raw materials of the rectifier module frame cover, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, 225°C for the third stage, injection pressure: 45MPa, The holding pressure is 40MPa, and the injection molding work is started;

(2-2) The rectifier module frame cover produced by the injection molding machine is placed face down on the shaping positioning plate, and the stroke of the shaping tool is the stroke S of the _shaping tool determined in step (3); Press down the frame cover of the rectifier module to deform the frame cover of the rectifier module in the reverse direction to offset the deformation of the frame cover of the rectifier module due to cooling and shrinkage;

(2-3) The frame cover of the reversely deformed rectifier module is cooled, and is completely flat after cooling.

The present invention first obtains the reverse deformation stroke of different rectifier module frame covers through debugging, and then in the subsequent injection molding production, for the same type of product, as long as the stroke of the manual press is fixed in the reverse phase deformation stroke, the same type of product can be realized. The anti-phase deformation ensures the flatness of the cover plate of the same type of product, and there is no gap when it is matched with the corresponding rectifier module.

In order to solve the technical problem of material residue at the nozzle during the injection molding process, the present invention is further improved. The raw materials of the rectifier module frame cover include: 95wt% PBT and 5wt% PBT recycled material. The material remaining in the nozzle is recycled and mixed into the raw material according to the proportion, which realizes the material recovery without affecting the product quality.

In order to solve the technical problem of the smooth implementation of reverse deformation, the present invention is further improved. Before the shaping tool works, it is checked whether the pressing handle mechanism slides normally.

In order to solve the technical problem of fixing the shaping positioning plate and the base of the manual press, the present invention is further improved, and the shaping positioning plate is bolted to the base of the manual press.

In order to solve the technical problem of how the rectifier module cover plate is positioned on the shaping positioning plate, the present invention is further improved. The shaping positioning block is machined with a frame cover positioning groove, and the frame cover positioning groove is located above the punching groove.

In order to solve the technical problem of the smooth implementation of the reverse deformation stroke, the present invention is further improved, and the height of the punching groove is greater than the reverse deformation stroke S _end .

In order to solve the technical problem of indentation on the back of the cover plate caused by reverse deformation, the present invention is further improved. The material of the shaping positioning plate and the punching head is aluminum alloy, and the aluminum alloy material is soft, which can reduce the reverse direction of the back of the cover plate. indentations caused during the process.

In order to solve the technical problem that the punching force of the rectifier module cover plate with the same back structure is not uniform, the present invention is further improved, and the punching head is cylindrical.

In order to solve the technical problem that the structure of the back of the cover plate is uneven and the use of a flat punching surface causes uneven punching, the present invention is further improved. The head of the punching head is an inverted U-shaped structure, and the punching part is the reinforcement of the back of the cover plate tendons.

In order to solve the technical problem of deformation and distortion of the rectifier module frame cover, the present invention is further improved. The pressure holding time in the injection molding stage is 5-10s. By increasing the pressure holding time, the deformation amount of the rectifier module frame cover is reduced.

In order to solve the technical problem of uneven structure on the back of the cover plate, the present invention is further improved. The size of the punching head is smaller than that of the cover plate, so that the punching head can enter the punching groove and meet the stroke requirement of reverse deformation.

Description of drawings

1 is a schematic view of the front structure of the frame cover of the rectifier module MDC110 in Embodiment 1;

2 is a schematic view of the reverse structure of the frame cover of the rectifier module MDC110 in Embodiment 1;

3 is a cross-sectional view of the frame cover of the rectifier module MDC110 in Embodiment 1;

4 is a schematic structural diagram of a frame cover shaping tool for the rectifier module MDC110 in Embodiment 1;

5 is a schematic structural diagram of a positioning plate of a rectifier module MDC110 frame cover shaping tool in Embodiment 1;

6 is a schematic view of the front structure of the rectifier module MDS75 frame cover of Embodiment 2;

7 is a schematic view of the reverse structure of the rectifier module MDS75 frame cover of Embodiment 2;

8 is a cross-sectional view of the rectifier module MDS75 frame cover of Embodiment 2;

9 is a schematic structural diagram of a rectifier module MDS75 frame cover shaping tool in Embodiment 2;

FIG. 10 is a schematic structural diagram of the positioning plate of the rectifying module MDS75 frame cover shaping tool in Embodiment 2. FIG.

detailed description

Example 1

As shown in Figure 1-3, the MDC110 rectifier module frame cover 1 has two slots 10 evenly distributed on the front of the frame cover, and the slots are arranged along the width direction of the cover plate. The setting of the groove reduces the stress, thereby reducing the amount of deformation. Reinforcing ribs 11 are provided on the back of the slot. The back of the frame cover includes 3 protrusions 12 .

A preparation method of an MDC110 rectifier module frame cover, comprising the following steps:

(1) Use the shaping tool to debug the MDC110 frame cover test sample of the rectifier module, and determine the stroke S _end of the reverse deformation.

(1-1) Fill the hopper of the injection molding machine with the raw materials for the frame cover of the rectifier module MDC110. The raw materials for the frame cover of the rectifier module MDC110 include: 95wt% PBT, 5wt% PBT recycled material; The first stage is 255°C, the second stage is 240°C, and the third stage is 225°C.

(1-2) Select the MDC110 frame cover of the rectifier module injected by the injection molding machine as the test sample 1. The test sample of the rectifier module MDC110 frame cover removes the glue and burrs. At this time, the surface temperature of the rectifier module MDC110 frame cover test sample is 180 ~ 220 ℃; Then use the shaping tool to shape the test sample of the frame cover of the rectifier module MDC110;

As shown in Figures 4-5, the shaping tool includes a manual press 3 and a first shaping positioning plate 4, the manual press 3 includes a base 38, the base 38 is provided with a support rod 30, and the support rod 30 is provided with a handpiece 31, A punching rod 32 and a pressing handle 33 are arranged on the machine head, and the pressing handle 33 rotates to drive the punching rod 32 to move up and down; , the limit bolt 34 is located under the travel plate 35; the support rod is provided with a punch rod reset device, including a mounting rod 37 and a reset spring 36, the mounting rod 37 is set on the machine head 31, and one end of the reset spring 36 is set on the mounting rod 37, The other end of the return spring 36 is provided on the punch rod 32 . The punching surface of the punching head is an inverted U shape; the length of the punching head is less than the width of the cover plate;

The base 38 of the manual press is bolted to fix the first shaping positioning plate 4, and the shaping positioning plate is machined with a punching groove 42, which is located directly below the punching head; the shaping positioning block is processed with a frame cover positioning groove 41, the frame cover The positioning slot is located above the punching slot; the length of the frame cover positioning slot 41 is greater than the length of the punching slot. A stepped structure is formed between the top surface of the first shaping positioning plate 4, the positioning groove 41 of the frame cover and the punching groove;

At this time, the stroke of the shaping tool is the distance between the bottom of the limit bolt and the top plate of the machine head, which is recorded as the _beginning of S;

Before plastic tooling work, check whether the pressing handle mechanism slides normally;

Put the MDC110 frame cover test sample of the rectifier module face down on the frame cover positioning groove 41 of the first shaping positioning plate 4, and the stamping parts of the MDC110 frame cover are the two reinforcing ribs 11 on the back;

Press down the test sample of the frame cover of the rectifier module MDC110 by a manual press, and the stamping part is the middle protrusion on the back of the cover plate, so that the test sample of the frame cover of the rectifier module MDC110 is reversely deformed, which is used to offset the cooling shrinkage of the frame cover of the rectifier module MDC110. deformation;

(1-3) After the rectifier module MDC110 frame cover test sample that has been deformed in reverse is cooled, match the cooled rectifier module MDC110 frame cover test sample with the matching rectifier module MDC110 frame, and check whether there is any gap at the joint. To judge whether the magnitude of the downward pressure is appropriate, specifically:

If the middle of the MDC110 frame cover test sample of the rectifier module bulges upwards and there is a gap in the middle, it proves that the reverse deformation stroke of the experiment is greater than the S _end , and the limit bolt is moved down to reduce the stroke of the shaping tool;

If the middle of the MDC110 frame cover test sample of the rectifier module is concave downward, and the two ends are lifted up, there are gaps at both ends, which proves that the reverse deformation stroke of the experiment is less than the S _end , and the limit adjustment bolt is moved up to increase the stroke of the shaping tool;

(1-4) By adjusting the position of the limit bolt of the manual press, the stroke of the manual press is controlled, and steps (1-2) and (1-3) are repeated on different test samples until the shape and cooling Until the test sample of the frame cover of the rectifier module MDC110 is completely straight, the limit bolt is fastened at this time, and the stroke of the manual press is the distance between the bottom of the limit bolt and the top plate of the machine head, which is recorded as S _end ;

(2) Continuously prepare the frame cover of the non-deformation rectifier module MDC110

(2-1) Fill the hopper of the injection molding machine with the raw materials for the frame cover of the rectifier module MDC110, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, and 225°C for the third stage, injection pressure: 45MPa , the holding pressure is 40MPa, and the injection molding work is started;

(2-2) The frame cover of the rectifier module _MDC110 produced by the injection molding machine is placed face down on the first shaping positioning plate 4, and the stroke of the shaping tool is the stroke S of the shaping tool determined in step (3); The press presses down the frame cover of the rectifier module MDC110, so that the frame cover of the rectifier module MDC110 is deformed in the reverse direction, which completely offsets the deformation amount of the cooling shrinkage of the frame cover of the rectifier module MDC110;

(2-3) The frame cover of the reversely deformed rectifier module MDC110 is cooled, and is completely flat after cooling.

The height of the punching groove should be greater than the stroke S of the reverse _deformation to ensure the reverse deformation stroke.

Example 2

As shown in Figure 6-8, the front of the frame cover of the MDS75 rectifier module is arranged in two rows, with three pole piece mounting holes 50 arranged in one row and two pole piece mounting holes arranged in one row. A vertical groove 51 is machined between the pole piece installation holes, and a transverse groove 52 is machined between the two rows of pole piece installation holes. The setting of the groove reduces the stress, thereby reducing the amount of deformation. The back of the slot is provided with five protrusions 53, which correspond one-to-one with the pole piece mounting holes. The non-protruding portion is the shaping region 54 .

A preparation method of a frame cover of an MDS75 rectifier module, comprising the following steps:

(1) Use the shaping tool to debug the frame cover test sample of the MDS75 rectifier module, and determine the stroke S _end of the reverse deformation.

(1-1) Fill the hopper of the injection molding machine with the raw materials for the frame cover of the MDS75 rectifier module. The raw materials for the frame cover of the MDS75 rectifier module include: 95wt% PBT, 5wt% PBT recycled material; The first stage is 255°C, the second stage is 240°C, and the third stage is 225°C, injection pressure: 45MPa, holding pressure 40MPa, holding pressure time 10s; start injection molding;

(1-2) Select the MDS75 rectifier module frame cover injected by the injection molding machine as the test sample. The MDS75 rectifier module frame cover test sample removes the glue and burrs. At this time, the surface temperature of the MDS75 rectifier module frame cover test sample is 180 ~ 220 ℃; Use the shaping tool to shape the test sample of the frame cover of the MDS75 rectifier module;

As shown in Figures 9-10, the shaping tool includes a manual press 3 and a first shaping positioning plate 4. The manual press 3 includes a base 38, a support rod 30 is provided on the base 38, and a machine head 31 is set on the support rod 30. The machine head A punching rod 32 and a pressing handle 33 are arranged on the upper end, and the pressing handle 33 rotates to drive the punching rod 32 to move up and down; The bit bolt 34 is located between the machine head 31 and the travel plate 35 . The punch rod reset device includes an installation rod 37 and a return spring 36. The installation rod 37 is set on the machine head, one end of the return spring 36 is set on the installation rod 37, and the return spring 36 is fixedly connected to the upper end of the punch rod 32. The punching head 39 is cylindrical, and is matched with the shaping area 54 on the back of the frame cover of the MDS75 rectifier module.

The second shaping positioning plate 6 is fixed on the base 38 of the manual press by bolts, the second shaping positioning plate 6 is machined with a cross groove 60, and the intersection of the cross groove forms a punching groove 64; the cross groove divides the second shaping positioning block 6 Four positioning blocks 61 are formed, and the four positioning blocks 61 are located at the four corners of the second shaping positioning block 6; U-shaped limiting blocks 62 are arranged on the two positioning blocks arranged laterally. Place the four corners of the frame cover of the MDS75 rectifier module on the four positioning blocks, which are supported by the four positioning blocks 6 and limited by the limit blocks 62 to prevent the frame cover of the MDS75 rectifier module from moving forward, back, left and right.

Before the shaping tooling work, check whether the pressing handle mechanism slides normally; the material of the second shaping positioning plate 6 and the punch head is aluminum alloy; The press presses down the test sample of the frame cover of the MDS75 rectifier module, and the stamping part is the shaping area 54 on the back of the frame cover of the MDS75 rectifier module, so that the test sample of the frame cover of the MDS75 rectifier module is reversely deformed, which is used to offset the cooling shrinkage of the frame cover of the MDS75 rectifier module. deformation;

(1-3) After the reversely deformed MDS75 rectifier module frame cover test sample is cooled, match the cooled MDS75 rectifier module frame cover test sample with the matching MDS75 rectifier module frame, and check whether there is a gap at the joint. To judge whether the magnitude of the downward pressure is appropriate, specifically:

If the middle of the MDS75 rectifier module frame cover test sample bulges upwards and there is a gap in the middle, it proves that the reverse deformation stroke of the experiment is greater than the S _end , and the limit bolt is moved down to reduce the stroke of the shaping tool;

If the middle of the MDS75 rectifier module frame cover test sample is concave downward, and the two ends are lifted up, there are gaps at both ends, which proves that the reverse deformation stroke of the experiment is smaller than the S _end , and the limit adjustment bolt is moved up to increase the stroke of the shaping tool;

(1-4) By adjusting the position of the limit bolt of the manual press, the stroke of the manual press is controlled, and steps (1-2) and (1-3) are repeated on different test samples until the shape and cooling MDS75 rectifier module frame cover test sample is completely straight, at this time, the limit bolt is fastened, and the stroke of manual press is the distance between the bottom of the limit bolt and the top plate of the machine head, which is recorded as S _end ;

(2) Continuous preparation of deformation-free MDS75 rectifier module frame cover

(2-1) Fill the injection molding machine hopper with the raw materials of the MDS75 rectifier module frame cover, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, and 225°C for the third stage, and the injection pressure of the nozzle: 45MPa, holding pressure 40MPa, start injection molding;

(2-2) The _MDS75 rectifier module frame cover produced by the injection molding machine is placed face down on the second shaping positioning plate 6, and the stroke of the shaping tool is the stroke S of the shaping tool determined in step (3); The press presses down the frame cover of the MDS75 rectifier module, so that the frame cover of the MDS75 rectifier module is deformed in the reverse direction, which completely offsets the deformation amount of the cooling and shrinkage of the frame cover of the rectifier module;

(2-3) The frame cover of the reversely deformed MDS75 rectifier module is cooled and completely flat after cooling.

Claims

A preparation method of a rectifier module frame cover, characterized in that the preparation method is:

(1) Use the shaping tool to debug the frame cover test samples of different rectifier modules, and determine the end of the reverse deformation stroke S

(1-1) Fill the hopper of the injection molding machine with the raw materials of the rectifier module frame cover, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, 225°C for the third stage, injection pressure: 45MPa, Holding pressure 40MPa; start injection molding;

(1-2) Select the rectifier module frame cover injected by the injection molding machine as the test sample. The rectifier module frame cover test sample removes the glue and burrs. At this time, the surface temperature of the rectifier module frame cover test sample is 180-220°C; Shape the test sample of the frame cover of the rectifier module;

The shaping tool includes a manual press and a shaping positioning plate. The manual press includes a base, a support rod is set on the base, a machine head is set on the support rod, a punch rod and a pressure handle are set on the machine head, and the pressure handle rotates to drive the punch rod up and down. Movement; the lower end of the punching rod is provided with a punching head, the upper part of the punching rod is provided with a stroke plate, a limit bolt is set on the stroke plate, and the limit bolt is located under the stroke plate; a punching rod reset device is arranged on the machine head;

A shaping positioning plate is fixed on the base of the manual press, and a punching slot is machined on the shaping positioning plate, and the punching slot is located directly below the punching head; at this time, the stroke of the shaping tool is the distance between the bottom of the limit bolt and the top plate of the machine head, Recorded as the beginning of S;

Place the test sample of the rectifier module frame cover face down on the shaping positioning plate, and press the test sample of the rectifier module frame cover down by a manual press to reverse the deformation of the rectifier module frame cover test sample, which is used to offset the cooling of the rectifier module frame cover (1-3) After the rectifier module frame cover test sample to be deformed in reverse is cooled, match the cooled rectifier module frame cover test sample with the matching rectifier module frame, and check whether there are any joints If the middle of the test sample of the rectifier module frame cover bulges upwards and there is a gap in the middle, it proves that the reverse deformation stroke of the experiment is greater than the end of S, and the limit bolt is moved down to reduce The itinerary of plastic tooling;

If the middle of the test sample of the rectifier module frame cover is concave downward, and the two ends are raised upward, there are gaps at both ends, which proves that the reverse deformation stroke of the experiment is smaller than the S end , and the limit adjustment bolt is moved upward to increase the stroke of the shaping tool;

(1-4) By adjusting the position of the limit bolt of the manual press to control the pressing stroke of the manual press, repeat steps (1-2) and (1-3) on the test samples of the frame cover of different rectifier modules until the shaping After cooling, the test sample of the frame cover of the rectifier module is completely straight. At this time, the limit bolt is fastened, and the stroke of the manual press is the distance between the bottom of the limit bolt and the top plate of the machine head, which is recorded as S end ;

(2) Continuous preparation of non-deformation rectifier module frame cover

(2-1) Fill the hopper of the injection molding machine with the raw materials of the rectifier module frame cover, adjust the process parameters of the injection molding machine, and set the temperature to: 270°C for the nozzle, 255°C for the first stage, 240°C for the second stage, 225°C for the third stage, injection pressure: 45MPa, The holding pressure is 40MPa, and the injection molding work is started;

(2-2) The rectifier module frame cover produced by the injection molding machine is placed face down on the shaping positioning plate, and the stroke of the shaping tool is the stroke S of the shaping tool determined in step (3); Press down the rectifier module frame cover to reversely deform the rectifier module frame cover, which is used to offset the deformation of the rectifier module frame cover due to cooling and shrinkage;

(2-3) The frame cover of the reversely deformed rectifier module is cooled, and is completely flat after cooling.
The method for preparing a rectifier module frame cover according to claim 1, wherein the raw materials of the rectifier module frame cover include: 95wt% PBT and 5wt% PBT recycled material.
The method for preparing a frame cover of a rectifier module according to claim 1, wherein, before the shaping tool works, it is checked whether the pressing handle mechanism slides normally.
The method for preparing a rectifier module frame cover according to claim 1, wherein the shaping positioning plate is bolted to the base of the manual press.
The method for preparing a frame cover of a rectifier module according to claim 1, wherein a frame cover positioning groove is processed on the shaping positioning block, and the frame cover positioning groove is located above the punching groove.
The method for manufacturing a rectifier module frame cover according to claim 1, wherein the height of the punching groove is greater than the stroke end S of the reverse deformation.
The method for preparing a frame cover of a rectifier module according to claim 1, wherein the shaping positioning plate and the punching head are made of aluminum alloy.
The method for preparing a frame cover of a rectifier module according to claim 1, wherein the punching head is cylindrical.
The method for preparing a frame cover of a rectifier module according to claim 1, wherein the punching head has an inverted U-shaped structure.
The method for preparing a rectifier module frame cover according to claim 1, wherein the pressure holding time in the injection molding stage is 5-10s.