Stamping progressive die for three-dimensional circular part with holes

Abstract

The utility model relates to a continuous stamping die for a three-dimensional circular perforated part, which is used for processing the three-dimensional circular perforated part and comprises a guide chute, a plane punching section, a raising section, a hole repairing section and a blanking section which are arranged along the conveying direction of a material belt, the plane punching section comprises a pair of side positioning hole punches, a pair of center positioning hole punches, a pair of pillow-shaped waste punches, a pair of strip-shaped waste punches and a pair of Z-shaped waste punches, the side positioning hole punches cut side positioning holes in the positions, close to the first straight strip part, of the traction area, the center positioning hole punches cut center preformed holes in the center of the round blank, and the Z-shaped waste punches cut center preformed holes in the center of the round blank; the inner diameter of the center preformed hole is smaller than that of the center hole, and the pillow-shaped waste punch cuts off pillow-shaped waste. According to the utility model, the circular blanks are arranged in two rows on the material belt, and a one-to-two processing mode is adopted, so that the production efficiency is high; round blanks in adjacent rows are crossed front and back, and the area utilization rate of the material belt is improved. And during raising, the first curved strip part and the two second curved strip parts can deform, so that the connection relation is ensured.

Description

Technical Field

[0001] This utility model relates to the field of metal stamping technology, and in particular to a three-dimensional circular stamping continuous die with holes. Background Technology

[0002] Metal stamping is a common process in the processing of many metal products. With the diversification of customer needs, mold design must also meet the requirements of various products.

[0003] Figure 1 The outer edge of the three-dimensional circular perforated part 1 is basically circular, with the middle part arching upwards to form a protrusion 11. The center of the protrusion 11 has a central hole 12, the axis of which is collinear with the axis of the outer edge. The inner wall of the central hole 12 has multiple notches 121 evenly distributed around the axis, and the upper edge of the central hole 12 has a chamfered surface 122. To save material, although a multi-row staggered material arrangement can be used for circular parts (see "Multi-row Continuous Die Stamping Process and Mold", Zhang Zhengxiu et al., Forging and Pressing Machinery, No. 5, pp. 9-13, 19991030) to save strip width, i.e., the material is distributed in multiple rows in the forming area, but the forming areas of adjacent rows are staggered, this material arrangement method is generally suitable for planar products. For products with embossing, a single-row staggered material arrangement is often used, i.e., the forming part is in the middle, and the two sides are traction parts. A curved connection part is also left between the traction part and the forming part, so that the curved connection part can adapt to the edge changes caused by embossing. Multi-row staggered material arrangement is not commonly used for round parts with raised embossing.

[0004] Therefore, it is necessary to develop a new mold to optimize the material utilization and efficiency of stamping. Utility Model Content

[0005] The main purpose of this utility model is to provide a three-dimensional circular punching continuous die that can make the layout of the three-dimensional circular punched part on the strip more economical in terms of strip width.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a three-dimensional circular punching continuous die for processing three-dimensional circular punched parts, wherein the three-dimensional circular punched parts have a circular edge, a protrusion that arches upward from the middle, and a central hole located at the center of the protrusion, and the axis of the central hole is collinear with the axis of the edge;

[0007] It includes a guide trough, a planar punching section, a embossing section, a hole-refining section, and a blanking section arranged along the conveying direction of the material belt. The embossing section is used to form the embossed part, the hole-refining section is used to refine the center hole, and the blanking section cuts the three-dimensional circular perforated part from the material belt.

[0008] The processing range of the strip includes two traction zones, two circular blanks located between the two traction zones and arranged in a double-row staggered pattern, two first T-shaped deformation sections connecting the circular blanks to the traction zones closest to them, two second T-shaped deformation sections connecting adjacent circular blanks, and a number of scrap materials. The first T-shaped deformation section includes a first straight section directly connected to the traction zone and two first curved sections connected from the ends of the first straight sections to the outer arc edges of the two circular blanks respectively. The second T-shaped deformation section includes a second straight section directly connected to the inner side of one circular blank and two second curved sections connected from the ends of the second straight sections to the inner arc edges of the other row of two circular blanks respectively.

[0009] The planar punching section includes a pair of side positioning hole punches, a pair of center positioning hole punches, a pair of pillow-shaped scrap punches, a pair of strip-shaped scrap punches, and a pair of Z-shaped scrap punches. The side positioning hole punches cut side positioning holes in the traction zone near the first straight section. The center positioning hole punches cut a center pre-forming hole in the center of the circular blank. The inner diameter of the center pre-forming hole is smaller than the inner diameter of the center hole. The pillow-shaped scrap punches remove pillow-shaped scrap, which is formed by two circular blanks in the same row, two first curved sections, and two second curved sections. The strip-shaped scrap punches remove strip-shaped scrap, which is formed by the outer arc edge of the circular blank, the inner side of the traction zone, and two first T-shaped deformation sections on the same side. The Z-shaped scrap punches remove Z-shaped scrap, which is formed by the inner arc surface of the circular blank and two adjacent second T-shaped deformation sections.

[0010] Specifically, the planar punching section includes two steps: a pair of side positioning hole punches, a pair of center positioning hole punches, and a pair of pillow-shaped scrap punches are located in the first step, and a pair of strip-shaped scrap punches and a pair of Z-shaped scrap punches are located in the second step.

[0011] Specifically, the embossing section includes an embossing die and an embossing shaping die arranged sequentially along the conveying direction of the material belt. Both the embossing die and the embossing shaping die include a central positioning post that uses the central pre-forming hole to position the circular blank.

[0012] Furthermore, the inner wall of the central hole has multiple notches evenly distributed around the axis, and the upper edge of the central hole has a chamfered surface; the hole-repairing section includes a hole-expanding mold, a chamfering mold, a hole-cutting mold, and a hole-shaping mold arranged sequentially along the conveying direction of the material belt.

[0013] Specifically, the material unloading section includes a material unloading mold and a material unloading ramp located behind the material unloading mold.

[0014] The beneficial effects of this utility model's technical solution are:

[0015] This invention features a two-row layout of circular blanks on the strip, employing a one-out-two-processing method for high production efficiency. To improve the area utilization of the strip, adjacent rows of circular blanks are arranged in a staggered pattern. Each row of circular blanks has two points on one side connected to the traction zone via a first T-shaped deformation section, and two points on the other side connected to the two nearest circular blanks in the adjacent row via a second T-shaped deformation section. The embossing process causes greater shrinkage deformation on the outer side of the circular blank. After embossing, the outer diameter of the circular blank decreases, causing deformation of the two first curved sections and the two second curved sections. This ensures both the connection between the circular blank and its surrounding structure and accommodates the increased distance between the circular blank and its surrounding structure. Attached Figure Description

[0016] Figure 1 A three-dimensional view of a circular part with holes;

[0017] Figure 2 This is a top view of the strip and the progressive die components in the working state.

[0018] Figure 3 This is a three-dimensional view of the strip and the parts of the progressive die in the working state.

[0019] Figure 4 for Figure 3 A magnified view of a portion of position A in the middle;

[0020] Figure 5 This is a layout diagram of each punch in the upper die of the planar punching section;

[0021] Figure 6 This is a cross-sectional view of the process from the hole-repairing section to the blanking section in the mold-closed state.

[0022] The numbers in the image represent:

[0023] 1-Three-dimensional circular part with a hole, 11-Protrusion, 12-Center hole, 121-Notch, 122-Chamfered surface;

[0024] 2-Continuous stamping die,

[0025] 21- Feed chute,

[0026] 22-Flat punching section, 221-Side positioning hole punch, 222-Center positioning hole punch, 223-Pillow-shaped scrap punch, 223-Strip-shaped scrap punch, 224-Z-shaped scrap punch;

[0027] 23-Punching section, 231-Punching die, 232-Punching and shaping die, 233-Center positioning post.

[0028] 24-Drilling section, 241-Enlarging die, 242-Chamfering die, 243-Drilling die, 244-Drill shaping die.

[0029] 25- Blanking section, 251- Blanking die, 252- Blanking ramp;

[0030] 3-Material strip, 31-Traction zone, 311-Side positioning hole, 32-Circular blank, 321-Central pre-forming hole, 33-First T-shaped deformation section, 331-First straight section, 332-First curved section, 34-Second T-shaped deformation section, 341-Second straight section, 342-Second curved section, 35a-Pillow-shaped waste, 35b-Strip-shaped waste, 35c-Z-shaped waste. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments.

[0032] Example:

[0033] like Figure 1 and Figure 2 As shown, the present invention provides a three-dimensional circular punching continuous die 2 for processing a three-dimensional circular punch 1. The three-dimensional circular punch 1 has a circular edge, a protrusion 11 that arches upward from the center, and a central hole 12 located at the center of the protrusion 11. The axis of the central hole 12 is collinear with the axis of the edge. The inner wall of the central hole 12 has multiple notches 121 evenly distributed around the axis. The upper part of the edge of the central hole has a chamfered surface 122.

[0034] like Figures 2 to 4As shown, the three-dimensional circular punching progressive die 2 includes a guide trough 21 arranged along the conveying direction of the strip 3, a planar punching section 22, a embossing section 23, a hole-repairing section 24, and a blanking section 25. The processing range of the strip 3 includes two traction zones 31, two circular blanks 32 located between the two traction zones 31 and arranged in a double-row staggered pattern, two first T-shaped deformation sections 33 connecting the circular blanks 32 to their closest traction zones 31, two second T-shaped deformation sections 34 connecting adjacent circular blanks 32, and a number of scrap materials (pillows). The first T-shaped deformation section 33 includes a first straight section 331 directly connected to the traction area 31 and two first curved sections 332 connected from the end of the first straight section 331 to the outer arc edge of the two circular blanks 32 respectively. The second T-shaped deformation section 34 includes a second straight section 341 directly connected to the inner side of one circular blank 32 and two second curved sections 342 connected from the end of the second straight section 341 to the inner arc edge of the other row of two circular blanks 32 respectively. The planar punching section 21 includes a pair of side positioning hole punches 221, a pair of center positioning hole punches 222, a pair of pillow-shaped scrap punches 223, a pair of strip-shaped scrap punches 224, and a pair of Z-shaped scrap punches 225. The side positioning hole punches 221 cut side positioning holes 311 in the traction zone 31 near the first straight section 331. The center positioning hole punches 222 cut a center pre-forming hole 321 in the center of the circular blank 32. The inner diameter of the center pre-forming hole 321 is smaller than the inner diameter of the center hole 12. The pillow-shaped scrap punches 223... Pillow-shaped waste 35a is cut off. Pillow-shaped waste 35a is formed by two circular blanks 32, two first curved sections 332 and two second curved sections 342 in the same row. Strip-shaped waste punch 223 cuts off strip-shaped waste 35b. Strip-shaped waste 35b is formed by the outer arc edge of the circular blank 32, the inner side of the traction area 31 and two first T-shaped deformation sections 33 on the same side. Z-shaped waste punch 224 cuts off Z-shaped waste 35c. Z-shaped waste 35c is formed by the inner arc surface of the circular blank 32 and two adjacent second T-shaped deformation sections 34.

[0035] The planar punching section 22 is mainly for forming the traction zone 31 and the circular blank 32. The traction zone 31 uses the side positioning hole 311 as the positioning reference, which helps the circular blank 32 to be roughly positioned throughout the stamping process. The circular blank 32 is then precisely positioned using the center pre-forming hole 321, thereby achieving position-controllable convex deformation. This three-dimensional circular part with holes 1 itself has a center hole 12. Because the center hole 12 also has a more complex notch 121 and chamfered surface 122 structure, the center hole 12 cannot be obtained in one step at the beginning of forming, but needs to be transitioned using the center pre-forming hole 321. The circular blanks 32 are arranged in two rows on the strip 3, using a one-out-two-processing method, which has high production efficiency. In order to improve the area utilization of the strip 3, the adjacent rows of circular blanks 32 are staggered. Each row of circular blanks 32 has two points on one side connected to the traction area 31 via the first T-shaped deformation part 33, and two points on the other side connected to the two nearest circular blanks 32 in the adjacent row via the second T-shaped deformation part 34. The embossing process causes greater shrinkage deformation on the outer side of the circular blanks 32. After embossing, the outer diameter of the circular blanks 32 decreases, causing the two first curved sections 332 and the two second curved sections 342 to deform. This ensures both the connection between the circular blanks 32 and the surrounding structures and accommodates the increased distance between the circular blanks 32 and the surrounding structures.

[0036] like Figure 4 and Figure 5 As shown, the planar punching section 22 includes two steps. A pair of side positioning hole punches 221, a pair of center positioning hole punches 222 and a pair of pillow-shaped scrap punches 223 are located in the first step, and a pair of strip-shaped scrap punches 224 and a pair of Z-shaped scrap punches 225 are located in the second step.

[0037] The edges of the first curved section 332 and the second curved section 342 are curved, which can easily cause the tool to jam and break. To avoid this, the two curved edges of the first curved section 332 and the second curved section 342 need to be cut out in different steps. Therefore, the pillow-shaped scrap punch 223, the strip-shaped scrap punch 224, and the Z-shaped scrap punch 225 should be in different steps. Thus, the above layout can minimize the number of steps and avoid the problem of tool jamming.

[0038] like Figure 4 As shown, the embossing section 23 includes an embossing die 231 and an embossing shaping die 232 arranged sequentially along the conveying direction of the material belt 3. Both the embossing die 231 and the embossing shaping die 232 include a central positioning post 233 that uses a central pre-forming hole 321 to position the circular blank 32.

[0039] The round blank 32 will transform from a planar structure to a three-dimensional shell structure in the punching section 23. The material stress after punching by the punching die 231 will cause it to spring back, so it is necessary to use the punching and shaping die 232 to further modify its structure in order to obtain higher structural accuracy.

[0040] like Figure 3 and Figure 6 As shown, the hole-repairing section 24 includes a hole-expanding mold 241, a chamfering mold 242, a hole-cutting mold 243, and a hole-shaping mold 244 arranged sequentially along the conveying direction of the material belt 3.

[0041] To improve the positioning accuracy of the center pre-formed hole 321, its size may be set to only about 50% of that of the center hole 12. When the center hole 12 is actually machined, the material in the middle of the circular blank 32 is first punched off in the expanding die 241 to enlarge the hole diameter to an intermediate value, resulting in a semi-formed hole. The chamfering die 242 uses a punch with a truncated cone to press the inner edge of the semi-formed hole, crushing the upper part of the semi-formed hole into a chamfered surface 122. At this time, the excess material in the middle of the semi-formed hole will be squeezed to form a small-radius annular platform portion, which is still considered excess. The cutting die 243 is then used to cut off the annular platform portion, producing the center hole 12 with a notch 121.

[0042] like Figure 3 and Figure 6 As shown, the unloading section 25 includes an unloading mold 251 and an unloading ramp 252 located behind the unloading mold 251.

[0043] The blanking die 251 can first press the excess part of the outer periphery of the circular blank 32 tightly from top to bottom, and then cut the three-dimensional circular perforated part 1 from the material belt 3 from bottom to top. As the material belt 3 is conveyed forward, the three-dimensional circular perforated part 1 that has been separated from the material belt 3 will continue to move forward and then slide down from the blanking ramp 252 into the product collection box.

[0044] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A progressive die for stamping a three-dimensional circular part with a hole, used to process a three-dimensional circular part with a hole, the three-dimensional circular part with a hole having a circular edge, a protrusion arching upward from the center, and a central hole located at the center of the protrusion, the axis of the central hole being collinear with the axis of the edge; characterized in that: It includes a guide trough, a planar punching section, a embossing section, a hole-refining section, and a blanking section arranged along the conveying direction of the material belt. The embossing section is used to form the embossed part, the hole-refining section is used to refine the center hole, and the blanking section cuts the three-dimensional circular perforated part from the material belt. The processing range of the strip includes two traction zones, two circular blanks located between the two traction zones and arranged in a double-row staggered pattern, two first T-shaped deformation sections connecting the circular blanks to the traction zones closest to them, two second T-shaped deformation sections connecting adjacent circular blanks, and a number of scrap materials. The first T-shaped deformation section includes a first straight section directly connected to the traction zone and two first curved sections connected from the ends of the first straight sections to the outer arc edges of the two circular blanks respectively. The second T-shaped deformation section includes a second straight section directly connected to the inner side of one circular blank and two second curved sections connected from the ends of the second straight sections to the inner arc edges of the other row of two circular blanks respectively. The planar punching section includes a pair of side positioning hole punches, a pair of center positioning hole punches, a pair of pillow-shaped scrap punches, a pair of strip-shaped scrap punches, and a pair of Z-shaped scrap punches. The side positioning hole punches cut side positioning holes in the traction zone near the first straight section. The center positioning hole punches cut a center pre-forming hole in the center of the circular blank. The inner diameter of the center pre-forming hole is smaller than the inner diameter of the center hole. The pillow-shaped scrap punches remove pillow-shaped scrap, which is formed by two circular blanks in the same row, two first curved sections, and two second curved sections. The strip-shaped scrap punches remove strip-shaped scrap, which is formed by the outer arc edge of the circular blank, the inner side of the traction zone, and two first T-shaped deformation sections on the same side. The Z-shaped scrap punches remove Z-shaped scrap, which is formed by the inner arc surface of the circular blank and two adjacent second T-shaped deformation sections.

2. The three-dimensional circular punching continuous die according to claim 1, characterized in that: The planar punching section includes two steps: a pair of side positioning hole punches, a pair of center positioning hole punches, and a pair of pillow-shaped scrap punches are located in the first step, and a pair of strip-shaped scrap punches and a pair of Z-shaped scrap punches are located in the second step.

3. The three-dimensional circular punching continuous die for perforated parts according to claim 1, characterized in that: The embossing section includes an embossing die and an embossing shaping die arranged sequentially along the conveying direction of the material strip. Both the embossing die and the embossing shaping die include a central positioning post that uses the central pre-forming hole to position the circular blank.

4. The three-dimensional circular punching die with holes according to claim 3, characterized in that: The inner wall of the central hole has multiple notches evenly distributed around the axis, and the upper edge of the central hole has a chamfered surface; the hole repair section includes a hole expansion mold, a chamfering mold, a hole cutting mold and a hole shaping mold arranged sequentially along the conveying direction of the material belt.

5. The three-dimensional circular punching die with holes according to claim 1, characterized in that: The material unloading section includes a material unloading mold and a material unloading ramp located behind the material unloading mold.

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