Spoke deep drawing part processing technology and drawing die

Abstract

The application relates to a processing technology of a spoke deep drawing part, which comprises the following steps: S1, blanking, punching a predetermined shape of a sheet material on a rectangular sheet-shaped raw material; S2, deep drawing, deep drawing the sheet material by adopting a deep drawing die with an anti-drawing defect structure to form a deep drawing part; wherein the predetermined shape is a square structure with a rounded corner at the vertex, and the middle part of the opposite sides of the predetermined shape is a straight side; compared with a circular material in the prior art, the sheet material of the blanking and the deep drawing is reduced in the blanking area, the single sheet material cost is saved, the width of the lap joint is reduced, the raw material utilization rate is effectively improved, the appearance defects in the deep drawing process are eliminated by the deep drawing die with the anti-drawing defect structure, and the purpose of saving the production cost is achieved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts manufacturing technology, specifically to a processing technology and drawing die for a deep-drawn wheel spoke part. Background Technology

[0002] A steel wheel consists of two parts: the spokes and the rim, which are welded together. The spokes are connected to the vehicle body, and the rim is connected to the tire.

[0003] In passenger car systems, steel wheels are both safety and aesthetic components. Manufacturers and OEMs prioritize cost-effectiveness, aiming to minimize material usage. Because steel wheels are exposed on the chassis and easily visible during driving, obvious aesthetic defects are unacceptable. Due to vehicle design requirements (minimizing unsprung mass), wheel spoke design must strictly control weight while maintaining strength. Wheel manufacturers utilize existing processes to use high-strength, relatively thin materials. When wheel spoke shapes are complex, and the deep drawing and reverse drawing processes (currently the core processes in steel wheel spoke production) result in significant deformation, especially when large-format products use high-strength, thin materials, a series of stamping defects will emerge: such as wrinkling of the flange edges during deep drawing, bulging or wrinkling in shaped areas during deep or reverse drawing, etc. However, these aesthetic defects are unacceptable on the finished vehicle.

[0004] Because the stress state is consistent across all points on the edge of a round blank during deep drawing, the aforementioned defects do not occur when using traditional deep drawing dies. Therefore, in the existing technology, all manufacturers use round blanks to produce deep-drawn steel wheel parts. However, round blanking presents the following technical problems: Figure 1 As shown, the blanking of round materials requires a punching machine to continuously punch multiple round holes B on the incoming rectangular plate. In order to ensure the positioning of the incoming material, the incoming rectangular plate needs to be positioned with the relevant positioning parts (such as positioning block C) on the punching machine before punching. In order to ensure the integrity of the round material after punching, a large amount of excess material needs to be reserved on the outer periphery of each round material, that is, a wide overlap A is formed. This results in the waste of raw materials. For wheel manufacturers, the waste of material on each piece of incoming material may be small, but when it accumulates to the annual production specifications (hundreds of thousands or even millions of pieces), it becomes a huge cost waste. Therefore, it is necessary to provide a new processing technology for deep-drawn parts to save raw materials and ensure the elimination of defects during the deep-drawing process. Summary of the Invention

[0005] Based on the above description, the present invention provides a solution to the technical problem of large waste of raw materials in the prior art when using round blanks to process wheel spokes.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A machining process for a deep-drawn wheel spoke part includes the following steps:

[0008] S1. Blanking: Cutting out a sheet of the predetermined shape from a rectangular sheet of incoming material;

[0009] S2. Deep drawing: The sheet material is drawn into a deep-drawn part using a deep drawing die with a structure to prevent deep drawing defects.

[0010] The predetermined shape is a square structure with rounded corners at the vertices, and the middle part of the opposite sides of the predetermined shape is a straight edge.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0012] The processing technology for deep-drawn wheel spokes provided in this application changes the blanking material from the original round material to a square material with rounded corners, and at least part of the side of the square is a straight edge. During blanking, the width of the rectangular sheet material can be designed in advance to be consistent with the side length of the square blank material. During the blanking process, no overlap is required on both sides of the rectangular sheet material, and no overlap is required between two adjacent sheets on the same rectangular sheet material. With the diameter corresponding to the relative rounded corners remaining unchanged, the overall size of the deep-drawn part can be kept constant. Compared with the round material in the prior art, the blanking sheet material of this application reduces the blanking area, saves the cost per sheet material, reduces the overlap width, and effectively improves the material utilization rate. By eliminating appearance defects in the deep-drawing process through a deep-drawing die with an anti-deep-drawing defect structure, the purpose of saving production costs is achieved.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the deep drawing die includes an upper die and a lower die. The lower die includes a lower die ring and a deep drawing punch. The upper die includes a stripping die and a deep drawing die ring. The deep drawing punch is disposed inside the lower die ring and forms a lower die cavity with the lower die ring. The stripping die and the deep drawing punch are correspondingly disposed. The deep drawing die ring is located outside the stripping die and is disposed corresponding to the lower die cavity. The process of using a deep drawing die to deep draw the sheet material to form a deep-drawn part includes:

[0015] S21. Place the sheet material on the upper end of the drawing punch;

[0016] S22. Drive the ejection die to press down;

[0017] The anti-drawing defect structure includes an edge forming surface located at the lower end of the drawing die ring. The edge forming surface includes, from the outside to the inside, a first straight section, an inclined section, a second straight section, and a drawing rounded corner section connected in sequence. The height of the first straight section is lower than the height of the second straight section, and the drawing rounded corner section consists of two continuous rounded corners.

[0018] Furthermore, the anti-deep drawing defect structure also includes an elastic clamping member, which is disposed at the upper end of the ejection die and is used to clamp the portion of the sheet material located at the upper end of the deep drawing punch during the deep drawing process.

[0019] Furthermore, it also includes the following steps:

[0020] S3. Punch process holes: Punch process holes at the center of the drawn part.

[0021] This application also provides a drawing die, which includes an upper die, a lower die, and a structure to prevent drawing defects; the lower die includes a lower die ring, a drawing punch, and a drawing support plate, the drawing punch is disposed inside the lower die ring and forms a lower die cavity with the lower die ring, and the drawing support plate is annular and disposed in the lower die cavity;

[0022] The upper die includes a stripping die and a drawing die ring. The stripping die and the drawing punch are correspondingly arranged. The drawing die ring is located outside the stripping die and is arranged corresponding to the lower die cavity.

[0023] The anti-drawing defect structure includes an edge forming surface located at the lower end of the drawing die ring. The edge forming surface includes a first straight section, an inclined section, a second straight section, and a drawing rounded corner section connected sequentially from the outside to the inside. The height of the first straight section is lower than the height of the second straight section, and the drawing rounded corner section consists of two continuous rounded corners.

[0024] Furthermore, the anti-deep drawing defect structure also includes an elastic clamping member, which is disposed at the upper end of the ejection die and is used to clamp the portion of the sheet material located at the upper end of the deep drawing punch during the deep drawing process.

[0025] Furthermore, the elastic clamping element is a plurality of polyurethane rubbers, which are distributed circumferentially on the upper end of the ejection die, and the polyurethane rubbers are disposed near the outer side of the ejection die.

[0026] Furthermore, the upper die also includes an upper base plate and a die ring fixing plate. The upper base plate is connected above the ejection die. The elastic clamping member is disposed between the upper base plate and the ejection punch. The die ring fixing plate is connected to the lower end of the upper base plate and located outside the ejection punch. The drawing die ring is connected to the lower end of the die ring fixing plate.

[0027] Furthermore, it also includes a punch and a punching pad. A through hole is formed in the middle of the drawing die ring. The punch is connected to the lower end of the upper base plate and is set corresponding to the through hole. The punching pad is set in the middle of the upper end of the drawing punch. The punching pad has a clearance hole in the middle.

[0028] Furthermore, the lower die also includes a lower base plate, an ejector pin, and a guide post. The guide post is disposed on the lower base plate and located outside the lower die ring. The upper base plate is provided with a guide hole corresponding to the guide post. An ejector pin hole is formed at the bottom of the lower die cavity. The ejector pin can pass through the ejector pin hole to lift the drawing support plate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the blanking and punching area for wheel spokes in the prior art;

[0030] Figure 2 A schematic diagram of the blanking and punching area in the processing technology of a deep-drawn wheel spoke part provided in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the deep drawing die structure in the embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the segmented structure of the edge forming surface in an embodiment of this application; Detailed Implementation

[0033] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0034] This application provides a machining process for a deep-drawn wheel spoke part, which includes the following steps:

[0035] S1. Blanking: Cutting out a sheet of the predetermined shape from a rectangular sheet of incoming material;

[0036] The predetermined shape is a square structure with rounded corners at the vertices, and the middle part of the opposite sides of the predetermined shape is a straight edge.

[0037] S2. Deep drawing: Using a deep drawing die with a structure to prevent deep drawing defects, the sheet material is drawn to form a deep-drawn part.

[0038] In traditional die-cutting processes, round blanks are typically used for blanking, such as... Figure 1As shown, the round material needs to be cut into multiple round holes B by a punching machine on the incoming rectangular plate. In order to ensure the positioning of the incoming material, the incoming rectangular plate needs to be positioned with the relevant positioning parts (such as positioning block C) on the punching machine before punching. In order to ensure the integrity of the round material after punching, a large amount of excess material needs to be reserved on the outer periphery of each round material, that is, to form a wider overlap A.

[0039] In this application, such as Figure 2 The diagram shows the blanking area of ​​this embodiment. The width of the rectangular sheet material is designed to be the same as the side length of the square. During the blanking process, no overlap is required on both sides of the rectangular sheet material, and no overlap is required between two adjacent sheets E on the same rectangular sheet material. With the diameter corresponding to the relative rounded corners remaining unchanged, the overall size of the drawn part can be kept constant. Compared with the circular material in the prior art, the blanking sheet E of this application reduces the blanking area, saves the cost per sheet material, reduces the overlap width, and effectively improves the material utilization rate.

[0040] In the manufacturing of a specific wheel spoke, the incoming material is a high-strength rectangular steel plate for wheels with a thickness of 3.3mm. The length of the rectangular incoming material is set as l and the width as D. Under the condition of the same thickness, the amount of material used is determined by the area.

[0041] In the prior art, a wheel spoke manufacturing process uses a circular sheet with a diameter of 525mm as blank. In order to ensure the integrity and periphery stability of the circular sheet, since the middle part of the opposite side of the square is straight, the outer periphery of the circular sheet needs to be reserved with an overlap of at least 5mm. Two circular sheets are punched from a rectangular sheet.

[0042] At this point, the minimum dimension l = 525 × 2 + 5 × 3 = 1065 mm.

[0043] The smallest size is d = 525 + 5 × 2 = 535.

[0044] At this time, the rectangular sheet material area S 10 =569775mm 2 ,

[0045] Total blanking area S1 = 2 × 525 2 π≈432731mm 2 ,

[0046] Material utilization rate W1 = Blanking area / Total rectangular incoming material area = 75.95%.

[0047] In this application, the blanking material is a square structure with rounded corners at the vertices, wherein the diameter of the rounded corners is 525mm. In order to ensure that the overall product size is basically the same, the distance between opposite sides of the rounded corners is equal to the radius. Since the middle part of the opposite side of the sheet material is a straight edge, the side length of the square is less than the diameter of the rounded corner (525mm) and greater than the side length of the inscribed square of the circle containing the rounded corner (371mm). In a specific embodiment, the side length of the square is 515mm. According to the mathematical formula, the side length of the straight edge l0≈116mm. Since no overlap is required on both sides of the rectangular sheet material, and no overlap is required between two adjacent sheets on the same rectangular sheet material, a 5mm overlap is reserved at the tail end of the final blanking material to ensure the safety of loading and unloading.

[0048] At this point, the minimum dimension l = 512 × 2 + 5 = 1029 mm.

[0049] The smallest size is d = 512.

[0050] At this time, the rectangular sheet material area S 20 =526848mm 2 ,

[0051] The area of ​​a single sheet of material is the overlapping area of ​​a circle with a diameter of 525mm and a square with a side length of 512mm, which are centered at the same point. The total area of ​​the blanking, S2, is approximately 428915mm². 2 ,

[0052] Material utilization rate W2 = blanking area / total rectangular incoming material area = 81.41%.

[0053] Based on the data above, it can be seen that S 20 10 S2<S1,W2> W1.

[0054] In other words, with the overall product size being basically the same, the embodiments of this application, compared with the prior art, reduce the material used for single rectangular sheet incoming materials, reduce the material used for single sheet unloading, and increase the material utilization rate, thereby achieving the goal of saving production costs.

[0055] Based on the material cost calculation of the above structure, each wheel saves about 3 yuan in sheet material. A large wheel manufacturer can produce about 2,800 wheels per day, with an annual output of more than 1 million wheels, resulting in cost savings of 3 million yuan.

[0056] ​Due to the irregular sheet material structure, continuing to use the existing deep-drawing die for deep drawing will result in defects such as bulges and wrinkles during the deep-drawing process because the stress states of the straight edges and rounded corners of the sheet material are completely different. These defects are more pronounced and severe in deep-drawn parts, thus requiring a redesign of the existing deep-drawing die. Therefore, this application also provides a deep-drawing die, such as... Figure 3 As shown, it includes a lower die 10, an upper die 20, and a structure to prevent deep drawing defects.

[0057] The lower die 10 includes a lower die ring 11, a drawing punch 12, and a drawing support plate 13. The drawing punch 12 is disposed inside the lower die ring 11 and forms a lower die cavity 10a with the lower die ring 11. The drawing support plate 13 is annular and disposed in the lower die cavity 10a.

[0058] The upper die 20 includes a stripping die 21 and a drawing die ring 22. The stripping die 21 and the drawing punch 12 are correspondingly arranged. The drawing die ring 22 is located outside the stripping die 21 and is arranged corresponding to the lower die cavity 11.

[0059] like Figure 4 As shown, the anti-drawing defect structure includes an edge forming surface 221, which is located at the lower end of the drawing die ring 221. The edge forming surface 221 includes a first straight section a, an inclined section b, a second straight section c, and a drawing rounded corner section d connected sequentially from the outside to the inside. The height of the first straight section a is lower than the height of the second straight section c, and the drawing rounded corner section d consists of two continuous rounded corners.

[0060] The first straight section a mainly controls the wrinkling of the flange edge of the deep-drawn part. Its width is greater than the width of the blanking notch. The notch width is half the difference between the diameter of the rounded corner section and the side length of the square of the sheet. For example, in the sheet in the above embodiment, the notch width is (525-512) / 2=6.5mm. Therefore, in this embodiment, the width of the first straight section a is not less than 6.5mm.

[0061] The inclined segment b is a straight segment with a small slope angle. The angle between it and the extension surface of the first straight segment a ranges from 1.4° to 2°. Its purpose is to adjust the large pressing force by actively creating a space with a small slope, reducing the pressing area, and preventing the flange edge from wrinkling. In the above embodiment, the angle between the inclined segment b and the extension surface of the first straight segment a is 2°.

[0062] The purpose of the second straight section c is to ensure that the notch is in a compressed state when the drawing process reaches a certain stage.

[0063] The drawing fillet section d is the fillet section at the drawing nozzle, consisting of two continuous fillets. The lower end of the lower circle is tangent to the second straight section c, and the upper end of the upper circle is tangent to the inner wall of the drawing die ring 221. The purpose is to fully press down the flange edge at the notch, adjusting part of the fillet edge to a straight edge, so that the flange part of the notch section remains in a tightly pressed state until the end of the drawing process. This avoids problems such as bulging in this process and wrinkles in subsequent processes when it is in a relaxed state.

[0064] By using the four different drawing die rings 221 to draw the sheet material in this embodiment, the appearance problems such as flange edge wrinkling, bulging and wrinkling of the shaped parts caused by changing the blanking shape can be overcome.

[0065] In one specific embodiment of this application, the first straight segment a is distributed in an annular region with a diameter of 500-524mm, the inclined segment b is distributed in an annular region with a diameter of 450-500mm, the second straight segment c is distributed in an annular region with a diameter of 415-450mm, and the lower radius of the drawn rounded corner segment d is 10mm and the upper radius is 14mm.

[0066] Preferably, the anti-deep drawing defect structure further includes an elastic clamping member 23. The elastic clamping member 23 is disposed at the upper end of the ejector die 21 and is used to clamp the portion of the sheet material located at the upper end of the deep drawing punch 12 during the deep drawing process. In this embodiment, the elastic clamping member 23 is a plurality of polyurethane rubbers. The plurality of polyurethane rubbers are distributed circumferentially at the upper end of the ejector die 21. The polyurethane rubbers are disposed close to the outer side of the ejector die 21. The placement of the polyurethane rubbers close to the outer side of the ejector die 21 causes the rubber distribution circle to shift outward, increasing the space. The diameter and number of rubbers can be increased according to the actual situation, and the length of the rubbers can be increased, thereby increasing the force of the polyurethane rubbers, so that the ejector die 21 can play a clamping role on the already drawn portion during the deep drawing process.

[0067] The deep drawing die provided in this application embodiment is an improvement on the existing deep drawing die, and therefore it also has the conventional structure of a traditional deep drawing die.

[0068] Specifically, the upper die 20 also includes an upper base plate 24 and a die ring fixing plate 25. The upper base plate 24 is connected above the ejection die 21. The elastic clamping member 23 is disposed between the upper base plate 24 and the ejection punch 21. The die ring fixing plate 25 is connected to the lower end of the upper base plate 24 and located outside the ejection punch 21. The drawing die ring 22 is connected to the lower end of the die ring fixing plate 25.

[0069] The lower mold 10 also includes a lower base plate 14, an ejector pin 15, and a guide pin 16. The guide pin 16 is disposed on the lower base plate 14 and located on the outside of the lower mold ring 11. The upper base plate is provided with a guide hole corresponding to the guide pin. An ejector pin hole is formed at the bottom of the lower mold cavity. The ejector pin 15 can pass through the ejector pin hole to lift the drawing support plate 13.

[0070] Therefore, the use of deep drawing dies to draw sheet metal into deep-drawn parts includes:

[0071] S21. Place the sheet material on the upper end of the drawing punch 12;

[0072] S22, Drive the ejection die 21 to press down;

[0073] Specifically, the press head of the stamping machine is connected to the base plate 24, which drives the upper die 20 to press down and the ejection die 21 to descend, pressing the part of the sheet material near the edge into the lower die cavity to form a deep-drawn part. With the cooperation of the deep-drawing die ring 22 and the deep-drawing support plate 13, the defects on the edge of the deep-drawn part are eliminated.

[0074] Preferably, the deep drawing die further includes a punching punch 31 and a punching pad 32. A through hole is formed in the middle of the deep drawing die ring 22. The punching punch 31 is connected to the lower end of the upper base plate 24 and is set corresponding to the through hole. The punching pad 32 is set in the middle of the upper end of the deep drawing punch 12. The middle of the punching pad 32 has a clearance hole.

[0075] Therefore, this processing technology also includes:

[0076] S3. Punch process holes: Punch process holes at the center of the drawn part. Punching process holes at the center of the drawn part facilitates the handling and transfer of the drawn part after it has been drawn.

[0077] The processing technology for deep-drawn wheel spokes provided in this application changes the blanking material from the original round material to a square material with rounded corners, and at least part of the side of the square is a straight edge. During blanking, the width of the rectangular sheet material can be designed in advance to be consistent with the side length of the square blank material. During the blanking process, no overlap is required on both sides of the rectangular sheet material, and no overlap is required between two adjacent sheets on the same rectangular sheet material. With the diameter corresponding to the relative rounded corners remaining unchanged, the overall size of the deep-drawn part can be kept constant. Compared with the round material in the prior art, the blanking sheet material of this application reduces the blanking area, saves the cost per sheet material, reduces the overlap width, and effectively improves the material utilization rate. By eliminating appearance defects in the deep-drawing process through a deep-drawing die with an anti-deep-drawing defect structure, the purpose of saving production costs is achieved.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A machining process for a deep-drawn wheel spoke part, comprising the following steps: S1. Blanking: Cutting out a sheet of the predetermined shape from a rectangular sheet of incoming material; S2. Deep drawing: The sheet material is deep-drawn to form a deep-drawn part using a deep-drawing die with a structure designed to prevent deep-drawing defects; wherein... The predetermined shape is a square structure with rounded corners at the vertices, and the middle part of the opposite sides of the predetermined shape is a straight edge; The deep drawing die includes an upper die and a lower die. The lower die includes a lower die ring and a deep drawing punch. The upper die includes a stripping die and a deep drawing die ring. The deep drawing punch is disposed inside the lower die ring and forms a lower die cavity with the lower die ring. The stripping die and the deep drawing punch are correspondingly disposed. The deep drawing die ring is located outside the stripping die and is disposed corresponding to the lower die cavity. Deep drawing the sheet material using the deep drawing die to form a deep-drawn part includes: S21. Place the sheet material on the upper end of the drawing punch; S22. Drive the ejection die to press down; The anti-drawing defect structure includes an edge forming surface located at the lower end of the drawing die ring. The edge forming surface includes, from the outside to the inside, a first straight section, an inclined section, a second straight section, and a drawing rounded corner section connected in sequence. The height of the first straight section is lower than the height of the second straight section, and the drawing rounded corner section consists of two continuous rounded corners.

2. The processing technology of the deep-drawn spoke part according to claim 1, characterized in that, The anti-deep drawing defect structure also includes an elastic clamping member, which is disposed at the upper end of the ejection die and is used to clamp the portion of the sheet material located at the upper end of the deep drawing punch during the deep drawing process.

3. The processing technology for deep-drawn spoke parts according to any one of claims 1-2, characterized in that, It also includes the following steps: S3, punching process holes, punching process holes at the center of the drawn part.

4. A deep drawing die, characterized in that, The system includes an upper die, a lower die, and a structure to prevent deep drawing defects. The lower die includes a lower die ring, a deep drawing punch, and a deep drawing support plate. The deep drawing punch is disposed inside the lower die ring and forms a lower die cavity with the lower die ring. The deep drawing support plate is annular and disposed in the lower die cavity. The upper die includes a stripping die and a deep drawing die ring. The stripping die and the deep drawing punch are correspondingly disposed. The deep drawing die ring is located outside the stripping die and is disposed corresponding to the lower die cavity. The structure to prevent deep drawing defects includes an edge forming surface. The edge forming surface is located at the lower end of the deep drawing die ring. The edge forming surface includes, from the outside to the inside, a first straight section, an inclined section, a second straight section, and a deep drawing rounded corner section connected in sequence. The height of the first straight section is lower than the height of the second straight section. The deep drawing rounded corner section consists of two continuous rounded corners.

5. The deep drawing die according to claim 4, characterized in that, The anti-deep drawing defect structure also includes an elastic clamping member, which is disposed at the upper end of the ejection die and is used to clamp the portion of the sheet material located at the upper end of the deep drawing punch during the deep drawing process.

6. The deep drawing die according to claim 5, characterized in that, The elastic clamping element is a plurality of polyurethane rubbers, which are distributed circumferentially on the upper end of the ejection die, and the polyurethane rubbers are disposed near the outer side of the ejection die.

7. The deep drawing die according to any one of claims 5 to 6, characterized in that, The upper die also includes an upper base plate and a die ring fixing plate. The upper base plate is connected above the ejection die. The elastic clamping member is disposed between the upper base plate and the ejection die. The die ring fixing plate is connected to the lower end of the upper base plate and located outside the ejection die. The drawing die ring is connected to the lower end of the die ring fixing plate.

8. The deep drawing die according to claim 7, characterized in that, It also includes a punch and a punching pad. A through hole is formed in the middle of the drawing die ring. The punch is connected to the lower end of the upper base plate and is set corresponding to the through hole. The punching pad is set in the middle of the upper end of the drawing punch. The punching pad has a clearance hole in the middle.

9. The drawing die according to claim 7, characterized in that, The lower die also includes a lower base plate, an ejector pin, and a guide pin. The guide pin is disposed on the lower base plate and located outside the lower die ring. The upper base plate is provided with a guide hole corresponding to the guide pin. An ejector pin hole is formed at the bottom of the lower die cavity. The ejector pin can pass through the ejector pin hole to lift the drawing support plate.

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