A precision deep drawing die for anti-trapped air stamping

Abstract

This utility model discloses a precision deep drawing die for anti-trapped air stamping, including an upper die and a lower die, which can be opened and closed relative to each other. The upper die includes an upper die core, and the lower die includes a lower die core. One of the upper die core and the lower die core is a concave die, and the other is a convex die. At least one of the upper die core and the lower die core has a concave rounded corner on its outer surface. An exhaust hole extending in the vertical direction is provided at the concave rounded corner. The exhaust hole communicates with an exhaust groove, and the exhaust groove communicates with the outside of the precision deep drawing die for anti-trapped air stamping.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically to a precision deep drawing die for anti-trapped stamping. Background Technology

[0002] Deep drawing is a stamping process that uses dies to form open, hollow parts from flat blanks. It is widely used in the manufacture of precision metal parts in fields such as electronics, communications, medical devices, automobiles, and new energy components. As products become lighter, thinner, smaller, and more precise, extremely high requirements are placed on the dimensional accuracy, surface quality, and forming consistency of deep-drawn parts.

[0003] In precision deep drawing, especially in high-speed progressive die stamping, "air trapping" is a common technical problem. When the deep drawing punch contacts the sheet metal, the air and deep drawing oil between the working surface of the punch and the sheet metal are squeezed out. At the same time, air and deep drawing oil are also squeezed out between the die and the sheet metal and the inner die. The air and deep drawing oil between the punch and the die cannot be discharged in time.

[0004] To address the problem of trapped air, existing technologies involve creating vents between the punch and die or in a planar area to expel excess gas. However, this approach has significant limitations in certain situations: First, vents can easily leave mold marks on the part surface. Reducing the number of vents may improve this, but it can also lead to poor venting, especially with aluminum or thinner materials, or parts without a flat top, where the part must be free of mold marks and oil residue. Second, precision drawing typically uses drawing oil, and the amount of drawing oil on each part cannot be precisely controlled. Furthermore, when the top of the drawn part is uneven or has geometric shapes, excess drawing oil mixes with compressed air and cannot be expelled promptly from the vents in the middle or on the planar surface, forming a high-pressure air cushion or oil layer. Moreover, if the drawing oil is not expelled, it will accumulate, leading to problems such as part deformation, dimensional instability, and surface defects. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a precision deep drawing die that is resistant to trapped air during stamping.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A precision deep drawing die for anti-trapped air stamping includes an upper die and a lower die, which can be opened and closed relative to each other. The upper die includes an upper die core, and the lower die includes a lower die core. One of the upper die core and the lower die core is a die cavity, and the other is a punch. At least one of the upper die core and the lower die core has a concave rounded corner on its outer surface. An exhaust hole extending in the vertical direction is provided at the concave rounded corner. The exhaust hole communicates with an exhaust groove, and the exhaust groove communicates with the outside of the precision deep drawing die for anti-trapped air stamping.

[0007] In one embodiment, the venting holes include one or more upper venting holes disposed in the upper mold core and one or more lower venting holes disposed in the lower mold core.

[0008] In one embodiment, the venting groove includes an upper venting groove disposed on the upper mold. The upper venting groove has a transverse venting portion extending in the horizontal direction and a longitudinal venting portion extending in the vertical direction. The longitudinal venting portion is disposed on the left and right sides and the front and rear sides of the upper mold core. The upper part of the longitudinal venting portion and the upper part of the upper venting hole are respectively connected to the transverse venting portion.

[0009] In one embodiment, the upper mold includes an upper mold base arranged sequentially from top to bottom, an upper pad fixedly arranged relative to the upper mold base, an upper stop plate slidably arranged relative to the upper mold base, and an upper template fixedly arranged relative to the upper stop plate, wherein the upper mold core is slidably arranged relative to the upper template.

[0010] In one embodiment, the lateral exhaust portion of the upper exhaust groove is at least partially disposed between the upper pad and the upper stop plate.

[0011] In one embodiment, the upper mold core is provided above the upper pad, the upper stop plate and the upper template are arranged around the side of the upper mold core, and the transverse venting groove of the upper venting groove is at least partially disposed between the upper mold core and the upper pad.

[0012] In one embodiment, the venting groove includes a lower venting groove disposed on the lower mold. The lower venting groove has a transverse venting portion extending in the horizontal direction and a longitudinal venting portion extending in the vertical direction. The longitudinal venting portion is disposed on the left and right sides and the front and rear sides of the lower mold core. The lower part of the longitudinal venting portion and the lower part of the lower venting hole are respectively connected to the transverse venting portion.

[0013] In one embodiment, the lower mold includes a lower mold base arranged sequentially from bottom to top, a lower pad plate fixedly arranged relative to the lower mold base, a lower clamping plate fixedly arranged relative to the lower pad plate, and a lower ring mold slidably arranged vertically relative to the lower mold base, wherein the lower mold core is fixedly arranged relative to the lower mold base.

[0014] In one embodiment, the lateral venting portion of the lower venting groove is at least partially disposed between the lower clamping plate and the lower ring mold.

[0015] In one embodiment, the lower pad is disposed below the lower mold core, the lower clamping plate and the lower ring mold are disposed around the side of the lower mold core, and the transverse venting groove of the lower venting groove is at least partially disposed inside the lower mold core.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model relates to a precision deep drawing die for anti-trapped air stamping. By opening vent holes at the concave rounded corners of the die and punch, during deep drawing, the material thickness will decrease due to the stretching and flow of the material at the rounded corners. The material will stick to the convex rounded corners, while a gap will be generated at the concave rounded corners. Therefore, the vent holes are designed on the concave rounded corners so that they will not come into contact with the parts, thereby avoiding the generation of mold marks. In addition to setting vent holes only at the center of the die or punch, this invention can design more vent holes for venting and draining oil. By setting up venting channels, when the top of the part is uneven, the compressed air and excess drawing oil squeezed down by the punch and die can be quickly discharged to the outside through these venting channels, thus avoiding affecting the quality of the part. Attached Figure Description

[0017] Appendix Figure 1 This is a cross-sectional view of the precision deep drawing die for anti-trapped air stamping of this utility model in the mold-closed state; Appendix Figure 2 for Figure 1 Enlarged view of section A; Appendix Figure 3 This is a top view of the upper die core of the precision deep drawing die for anti-trapped air stamping according to this utility model; Appendix Figure 4 This is a top view of the upper stop plate of the precision deep drawing die for anti-trapped air stamping according to this utility model; Appendix Figure 5 This is a top view of the lower ring die of the precision deep drawing die for anti-trapped air stamping according to this utility model; Appendix Figure 6 This is a top view of the lower clamping plate of the precision deep drawing die for anti-trapped air stamping according to this utility model; The numbers on the map are: 1-Upper mold core; 2-Upper mold base; 3-Upper backing plate; 4-Upper stop plate; 5-Upper template; 6-Upper screw; 7-Upper guide post; 8-Upper nitrogen spring; 9-Upper vent hole; 10-Upper vent groove; 101-Transverse venting part; 102-Vertical venting part; 11-Lower mold core; 12-Lower mold base; 13-Lower backing plate; 14-Lower clamping plate; 15-Lower ring mold; 16-Lower screw; 17-Lower guide post; 18-Lower nitrogen spring; 19-Lower vent hole; 20-Lower vent groove; 21-Concave rounded corner. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, the directions such as "front," "rear," "left," "right," "up," and "down" are defined with reference to the directions observed during use, i.e., as shown below. Figure 1 As shown in the figure, the left side is "left", the right side is "right", the top side is "up", the bottom side is "down", and the direction perpendicular to the viewpoint is "forward" and "backward". The above definitions of directions are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] See Figure 1-6 As shown, the precision deep drawing die for anti-trapped air stamping of this utility model is used for stamping and forming parts. It has an open die state and a closed die state. The precision deep drawing die for anti-trapped air stamping includes an upper die and a lower die, which can be opened and closed relative to each other.

[0021] The upper mold includes an upper mold core 1, and also includes an upper mold base 2, an upper pad 3 fixedly disposed relative to the upper mold base 2, an upper stop plate 4 slidably disposed relative to the upper mold base 2, and an upper template 5 fixedly disposed relative to the upper stop plate 4, arranged sequentially from top to bottom. The upper mold core 1 is slidably disposed relative to the upper template 5. Specifically, an upper screw 6 is fixedly disposed inside the upper stop plate 4, and the upper end of the upper screw 6 is slidably disposed inside the upper mold base 2. The upper screw 6 is used to limit the vertical sliding distance of the upper stop plate 4 relative to the upper mold base 2. An upper guide post 7 is also provided, which is fixedly disposed to the upper stop plate 4. The upper end of the upper guide post 7 is slidably disposed inside the upper pad 3. The upper guide post 7 is used to guide the sliding of the upper stop plate 4 relative to the upper pad 3. The upper mold also includes an upper nitrogen spring 8, which is used to provide the elastic force required for the upper mold core 1 to slide downward relative to the upper template 5.

[0022] An upper backing plate 3 is provided above the upper mold core 1, and an upper stop plate 4 and an upper template 5 are arranged around the side of the upper mold core 1. The upper mold core 1 is specifically a die, and its outer surface has four concave rounded corners 21. An upper vent hole 9 extending in the vertical direction is opened at the concave rounded corners 21. The upper vent hole 9 communicates with the upper vent groove 10. The upper vent groove 10 communicates with the outside of the precision deep drawing die for anti-trapped air stamping. Specifically, the upper vent groove 10 has a transverse venting part 101 extending in the horizontal direction and a longitudinal venting part 102 extending in the vertical direction. The longitudinal venting part 102 is provided on the left and right sides and the front and rear sides of the upper mold core 1. The upper part of the longitudinal venting part 102 and the upper part of the upper vent hole 9 are respectively connected to the transverse venting part 101. A part of the transverse venting part 101 of the upper vent groove 10 is provided between the upper backing plate 3 and the upper stop plate 4, and another part of the transverse venting part 101 of the upper vent groove 10 is provided between the upper mold core 1 and the upper backing plate 3.

[0023] The lower mold includes a lower mold core 11, and further includes a lower mold base 12 arranged sequentially from bottom to top, a lower pad 13 fixedly arranged relative to the lower mold base 12, a lower clamping plate 14 fixedly arranged relative to the lower pad 13, and a lower ring mold 15 slidably arranged relative to the lower mold base 12. The lower mold core 11 is fixedly arranged relative to the lower mold base 12. Specifically, the lower ring mold 15 is fixedly provided with a lower screw 16, the lower end of which is slidably arranged within the lower mold base 12. The lower screw 16 is used to limit the vertical sliding distance of the lower ring mold 15 relative to the lower pad 13. A lower guide post 17 is also provided, which is fixedly arranged with the lower clamping plate 14. The upper end of the lower guide post 17 is slidably arranged within the lower ring mold 15. The lower guide post 17 is used to guide the sliding of the lower ring mold 15 relative to the lower clamping plate 14. The lower mold also includes a lower nitrogen spring 18, which is used to provide the elastic force required for the lower ring mold 15 to slide upward relative to the lower pad 13.

[0024] A lower backing plate 13 is provided below the lower die core 11, and a lower clamping plate 14 and a lower ring die 15 are arranged around the side of the lower die core 11. The lower die core 11 is specifically a punch, and its outer surface has four concave rounded corners 21. A lower vent hole 19 extending in the vertical direction is opened at the concave rounded corners 21. The lower vent hole 19 communicates with the lower vent groove 20. The lower vent groove 20 communicates with the outside of the precision deep drawing die for anti-trapped air stamping. Specifically, the lower vent groove 20 has a transverse venting part 101 extending in the horizontal direction and a longitudinal venting part 102 extending in the vertical direction. The longitudinal venting part 102 is provided on the left and right sides and the front and rear sides of the lower die core 11. The lower part of the longitudinal venting part 102 and the lower part of the lower vent hole 19 are respectively connected to the transverse venting part 101. A part of the transverse venting part 101 of the lower vent groove 20 is provided between the lower clamping plate 14 and the lower ring die 15, and another part of the transverse venting part 101 is provided inside the lower die core 11.

[0025] The following describes the working principle of the precision deep drawing die for anti-trapped gas stamping of the present invention. When transitioning from the open state to the closed state, the part to be drawn is placed between the upper die core 1 and the lower die core 11. The lower die core 11 applies a force to the upper die core 1 through the part, causing the upper nitrogen spring 8 to compress. The upper die core 1 slides upward relative to the upper template 5. Due to the stretching flow, the material thickness of the part at the rounded corner position between the upper die core 1 and the lower die core 11 decreases. The part material at this position will adhere to the convex rounded corner, while a gap is generated at the concave rounded corner 21. At this time, the part material at the concave rounded corner 21... The upper vent 9 and lower vent 19 at point 1 will not contact the part, thus avoiding the generation of mold marks on the part. The compressed air and excess drawing oil squeezed down by the upper mold core 1 and lower mold core 11 are discharged from the upper vent 9 and / or upper vent groove 10, and the lower vent 19 and / or lower vent groove 20, thus avoiding affecting the drawing quality of the part. When the mold is switched from the closed state to the open state, the upper mold core 1 gradually moves away from the lower mold core 11 until the upper mold core 1 slides downward due to the elastic force of the upper nitrogen spring 8, pushing the part out and completing the demolding.

[0026] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A precision drawing die for trapped air punch, characterized by, The device includes an upper die and a lower die, which can be opened and closed relative to each other. The upper die includes an upper die core, and the lower die includes a lower die core. One of the upper die core and the lower die core is a concave die, and the other is a convex die. At least one of the upper die core and the lower die core has a concave rounded corner on its outer surface. An exhaust hole extending in the vertical direction is provided at the concave rounded corner. The exhaust hole communicates with an exhaust groove, and the exhaust groove communicates with the outside of the precision deep drawing die for anti-trapped air stamping.

2. The trap-free air punch press precision draw die of claim 1, wherein: The vent holes include one or more upper vent holes disposed in the upper mold core and one or more lower vent holes disposed in the lower mold core.

3. The trap-free air punch press precision draw die of claim 2, wherein: The venting groove includes an upper venting groove disposed on the upper mold. The upper venting groove has a transverse venting portion extending in the horizontal direction and a longitudinal venting portion extending in the vertical direction. The longitudinal venting portion is disposed on the left and right sides and the front and rear sides of the upper mold core. The upper part of the longitudinal venting portion and the upper part of the upper venting hole are respectively connected to the transverse venting portion.

4. The precision deep drawing die for anti-trapped air stamping according to claim 3, characterized in that: The upper mold includes an upper mold base arranged sequentially from top to bottom, an upper pad fixedly arranged relative to the upper mold base, an upper stop plate slidably arranged relative to the upper mold base, and an upper template fixedly arranged relative to the upper stop plate. The upper mold core is slidably arranged relative to the upper template.

5. The precision deep drawing die for anti-trapped air stamping according to claim 4, characterized in that: The transverse exhaust portion of the upper exhaust groove is at least partially disposed between the upper pad and the upper stop plate.

6. The precision deep drawing die for anti-trapped air stamping according to claim 5, characterized in that: The upper mold core is provided with an upper pad plate above it, and the upper stop plate and the upper template plate are arranged around the side of the upper mold core. The transverse venting groove of the upper venting groove is at least partially provided between the upper mold core and the upper pad plate.

7. The precision deep drawing die for anti-trapped air stamping according to claim 2, characterized in that: The venting groove includes a lower venting groove disposed on the lower mold. The lower venting groove has a transverse venting portion extending in the horizontal direction and a longitudinal venting portion extending in the vertical direction. The longitudinal venting portion is disposed on the left and right sides and the front and rear sides of the lower mold core. The lower part of the longitudinal venting portion and the lower part of the lower venting hole are respectively connected to the transverse venting portion.

8. The precision deep drawing die for anti-trapped air stamping according to claim 7, characterized in that: The lower mold includes a lower mold base arranged sequentially from bottom to top, a lower pad plate fixedly arranged relative to the lower mold base, a lower clamping plate fixedly arranged relative to the lower pad plate, and a lower ring mold slidably arranged vertically relative to the lower mold base. The lower mold core is fixedly arranged relative to the lower mold base.

9. The precision deep drawing die for anti-trapped air stamping according to claim 8, characterized in that: The transverse exhaust portion of the lower exhaust groove is at least partially disposed between the lower clamping plate and the lower ring mold.

10. The precision deep drawing die for anti-trapped air stamping according to claim 9, characterized in that: The lower die core is provided below the lower pad plate, the lower clamping plate and the lower ring die are arranged around the side of the lower die core, and the transverse venting groove of the lower venting groove is at least partially provided inside the lower die core.

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