A u-shaped part thinning deep drawing forming die and application thereof

Abstract

This invention relates to a U-shaped thinning and deep drawing die and its application. The die includes a punch assembly (1) and a die assembly (2) for thinning and deep drawing strip material into a U-shaped part. The punch assembly (1) includes a punch (11), and the die assembly (2) includes a die (21). The outer edge of the punch (11) is provided with a plurality of punch working strips (111), and the inner edge of the die (21) is provided with a plurality of die working strips corresponding to the punch working strips (111). (211); The punch working strip (111) is planar and is evenly distributed circumferentially along the outer edge of the punch (11), and the die working strip (211) is planar and is evenly distributed circumferentially along the inner edge of the die (21); During deep drawing, the U-shaped part simultaneously abuts against both the punch working strip (111) and the die working strip (211), with the inner sidewall of the U-shaped part abutting against the punch working strip (111) and the outer sidewall abutting against the die working strip (211). Compared with the prior art, the present invention can perform thinning deep drawing of high-precision U-shaped parts with different specifications and different thinning rates, improving the versatility and flexibility of the mold.

Description

Technical Field

[0001] This invention relates to the field of sheet metal stamping technology, specifically to a U-shaped thinning and deep drawing die and its application. Background Technology

[0002] U-shaped parts are common components. When producing single pieces or small batches with low precision requirements, they can be formed from strips on a bending machine. When large-scale production is required, U-shaped parts are generally bent using bending dies with punches and dies. However, the precision of U-shaped parts formed by bending is limited, and the forming dies are mostly only suitable for one specification of product, resulting in poor versatility and failing to meet the requirements of multi-specification, high precision, large-volume, and low-cost production. Summary of the Invention

[0003] The purpose of this invention is to provide a thinning deep drawing die for U-shaped parts and its application, thereby improving versatility.

[0004] The objective of this invention can be achieved through the following technical solution: A U-shaped part thinning and deep drawing forming die, comprising a punch assembly and a die assembly for thinning and deep drawing strip material into a U-shaped part, wherein the punch assembly includes a punch, the die assembly includes a die, the outer edge of the punch is provided with a plurality of punch working strips, and the inner edge of the die is provided with a plurality of die working strips corresponding to the punch working strips;

[0005] The working zone of the punch is planar and is evenly distributed circumferentially along the outer edge of the punch; the working zone of the die is planar and is evenly distributed circumferentially along the inner edge of the die.

[0006] During deep drawing, the U-shaped part simultaneously abuts against both the punch working zone and the die working zone. The inner side of the U-shaped part abuts against the punch working zone, and the outer side of the U-shaped part abuts against the die working zone.

[0007] Preferably, the punch working zone extends vertically from the top of the punch to the bottom of the punch.

[0008] Preferably, the planes of each pair of corresponding punch working strips and die working strips are parallel.

[0009] More preferably, the horizontal distance between the die working zone and the punch working zone, i.e., the die-punch clearance, varies with the circumferential position of the die working zone within the die. That is, the die-punch clearances are different for two adjacent pairs of punch working zones and die working zones.

[0010] This invention utilizes different punch-die gaps arranged along the circumference of the punch and die to achieve the forming of precision U-shaped parts with different thinning rates and specifications using a set of thinning and drawing dies.

[0011] Preferably, the clearance between the punch and die is symmetrically arranged. That is, the clearance between the punch and die in symmetrical positions is the same, so that the sidewall thickness on both sides of the bottom of the same U-shaped part remains the same.

[0012] Preferably, the punch assembly further includes an upper template, on which a punch pad for loading the punch is provided; the die assembly further includes a lower template, on which a die pad for loading the die is provided.

[0013] More preferably, the upper template is fixed to the forming equipment by bolts and a guide assembly is provided between the upper template and the lower template for guiding.

[0014] More preferably, the guide assembly includes a guide post and a guide sleeve. The guide post is fixed to the edge of the lower template and passes through the upper template; the guide sleeve is fixed to the edge of the upper template and slides against the guide post.

[0015] More preferably, the punch assembly further includes a punch fixing plate, a punch connecting plate, and a punch fixing nut for fixing the punch;

[0016] The punch is fixed to the punch connecting plate by bolts, the punch connecting plate abuts against the punch pad, and is fixed to the punch fixing plate by punch fixing nuts. The punch fixing plate is fixed to the upper template by bolts.

[0017] More preferably, the die assembly further includes a die sleeve and a die pressure ring for fixing the die;

[0018] The die cavity abuts against the die cavity pad block and is interference-fitted with the die cavity outer sleeve. The die cavity pressure ring abuts against the die cavity outer sleeve and is fixed to the lower template by bolts.

[0019] Preferably, the U-shaped thinning and deep drawing die further includes an unloading assembly for unloading the U-shaped part.

[0020] More preferably, the unloading assembly includes an ejector rod and an unloading plate, wherein the ejector rod drives the unloading plate to eject the U-shaped part from the die cavity.

[0021] More preferably, the unloading plate is circular, located inside the die cavity, abutting against the die cavity pad, and fixed to the ejector rod, which passes through the lower template. During unloading, the unloading plate abuts against the bottom of the U-shaped part.

[0022] An application of the above-mentioned U-shaped thinning and deep drawing die, wherein the die is used to draw strip material into a U-shaped part, the U-shaped part including integrally formed sidewalls and bottom.

[0023] This invention provides a thinning deep drawing die for forming high-precision U-shaped parts of various specifications and its application. Compared with traditional U-shaped part bending forming dies, this die has higher versatility and flexibility, and produces higher product precision.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. By setting up multiple matching punch working zones and die working zones on the punch and die, this invention enables the thinning and deep drawing of high-precision U-shaped parts with different specifications and thinning rates, improving the versatility and flexibility of the mold, and helping to meet the requirements of mass production and low cost.

[0026] 2. The present invention, through the coordinated arrangement of the die pad, die sleeve and die pressure ring, can significantly improve the assembly accuracy of the mold, ensure the forming accuracy of the U-shaped part, and significantly improve the assembly efficiency of the mold.

[0027] 3. The present invention, through the coordinated arrangement of punch pad, punch fixing plate, punch connecting plate and punch fixing nut, can significantly improve the assembly accuracy of the mold, ensure the forming accuracy of the U-shaped part, and significantly improve the assembly efficiency of the mold.

[0028] 4. By setting a guide component between the upper and lower templates, the present invention can assist in matching the relative positions of the lower and upper templates, prevent the punch and die from shifting laterally, ensure the assembly accuracy of the mold, and ensure the forming accuracy of the U-shaped part;

[0029] 5. This invention provides a thinning and deep drawing die capable of forming high-precision U-shaped parts of various specifications. By utilizing the thinning and deep drawing process to form U-shaped parts, the dimensional accuracy of the formed parts is significantly improved, promoting the large-scale application of thinning and deep drawing technology and driving the technological progress and rapid development of precision plastic forming technology and related industries. Attached Figure Description

[0030] Figure 1 This is a perspective view of the mold of the present invention;

[0031] Figure 2 This is a cross-sectional view of the mold before deep drawing in this invention;

[0032] Figure 3 This is a cross-sectional view of the die during deep drawing according to the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the U-shaped component of the present invention;

[0034] Figure 5 This is a cross-sectional view of the die of the present invention;

[0035] In the diagram: 1-Punch assembly, 11-Punch, 111-Punch working belt, 12-Upper template, 13-Punch pad, 14-Punch fixing plate, 15-Punch connecting plate, 16-Punch fixing nut, 2-Die assembly, 21-Die, 211-Die working belt, 22-Lower template, 23-Die pad, 24-Die outer sleeve, 25-Die pressure ring, 3-Guide assembly, 31-Guide post, 32-Guide sleeve, 4-Ejector assembly, 41-Ejector rod, 42-Ejector plate, 5-Strip, 6-U-shaped part, 61-Side wall, 62-Bottom. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0037] Example 1

[0038] A U-shaped thinning and deep drawing die includes a punch assembly 1 and a die assembly 2. The punch assembly 1 includes a punch 11 and the die assembly 2 includes a die 21. In use, the strip to be deep drawn is placed between the punch 11 and the die 21, and the relative movement between the punch 11 and the die 21 processes it into a U-shaped part.

[0039] Specifically, the outer edge of the punch 11 is provided with a plurality of punch working strips 111, which are planar and are evenly distributed along the outer edge of the punch 11. Correspondingly, the inner edge of the die 21 is provided with a plurality of die working strips 211 corresponding to the punch working strips 111, which are planar and are evenly distributed along the inner edge of the die 21.

[0040] During deep drawing, the U-shaped part simultaneously abuts against the punch working zone 111 and the die working zone 211. The inner side of the side wall of the U-shaped part abuts against the punch working zone 111, and the outer side of the side wall abuts against the die working zone 211.

[0041] Example 2

[0042] A U-shaped thinning and deep drawing die is used to thin and deep draw strip 5 into a U-shaped part 6, such as... Figure 4 As shown, the U-shaped component 6 includes an integrally formed sidewall 61 and a bottom 62.

[0043] like Figures 1-3As shown, the mold includes a lower template 22 and an upper template 12 with corresponding positions; a matching die 21 and a punch 11 for forming a U-shaped part 6; a die pad 23 for loading the die 21; a punch pad 13 for loading the punch 11; a die sleeve 24 and a die pressure ring 25 for fixing the die 21; a punch fixing plate 14, a punch connecting plate 15, and a punch fixing nut 16 for fixing the punch 11; and an ejector pin 41 and a stripper plate 42 for ejecting the formed U-shaped part 6.

[0044] Furthermore, the punch 11 is fixed to the punch connecting plate 15 by bolts, the punch connecting plate 15 abuts against the punch pad 13, and is fixed to the punch fixing plate 14 by the punch fixing nut 16, and the punch fixing plate 14 is fixed to the upper template 12 by bolts.

[0045] Furthermore, the die 21 abuts against the die pad 23 and is interference-fitted with the die outer sleeve 24. The die pressure ring 25 abuts against the die outer sleeve 24 and is fixed to the lower template 22 by bolts.

[0046] Furthermore, the outer edge of the punch 11 is provided with a plurality of punch working strips 111, which are planar and are evenly distributed along the outer edge of the punch.

[0047] Furthermore, the inner edge of the die 21 is provided with a plurality of die working strips 211, which are planar and evenly distributed along the inner edge of the die.

[0048] Furthermore, the horizontal distance between the die working zone 211 and the punch working zone 111, i.e. the punch-die clearance, changes with the circumferential position of the die working zone 211.

[0049] Furthermore, by utilizing the different punch and die clearances of the aforementioned U-shaped part thinning and deep drawing die, the die can form precision U-shaped parts 6 with different thinning rates and specifications.

[0050] During deep drawing, the U-shaped part 6 simultaneously abuts against the punch working zone 111 and the die working zone 211; the inner side of the side wall of the U-shaped part 6 abuts against the punch 11, and the outer side of the side wall abuts against the die 21.

[0051] Furthermore, an unloading plate 42 is provided above the lower template 22. The unloading plate is circular, located inside the cavity mold 21, abutting against the cavity mold pad 23, and fixed to the ejector rod 41, which passes through the lower template 22.

[0052] During unloading, the unloading plate 42 abuts against the bottom of the formed U-shaped part 6.

[0053] Furthermore, the lower template 22 is fixedly provided with a guide post 31 on its edge to assist in matching the relative positions of the lower template 22 and the upper template 12. The guide post 31 passes through the upper template 12 and slides against the upper template 12.

[0054] Furthermore, the upper template 12 is fixedly provided with an auxiliary lower template 22 and an upper template 12 with a relative position matching, and the guide sleeve 32 slides against the guide post 31.

[0055] like Figures 2-3 As shown, the high-precision U-shaped part thinning and deep drawing process is as follows:

[0056] (1) Place strip 5 on die 21;

[0057] (2) The upper template 12 drives the punch 11 to move downward, and the punch 11 contacts the strip 5 to perform U-shaped part thinning and deep drawing forming;

[0058] (3) After the deep drawing stroke meets the requirements, the punch 11 moves upward and disengages from the U-shaped part 6. Then, under the action of the equipment unloading force, the ejector 41 drives the unloading plate 42 to push the U-shaped part 6 upward, completing the product ejection. The material used for the product is SAPH440 with a thickness of 4mm.

[0059] Example 3

[0060] A U-shaped part thinning and deep drawing die, such as Figure 5 As shown, the top of the die working zone 211 of the die 21 is provided with multiple flat surfaces with different inclination angles, and the flat surfaces are smoothly transitioned with rounded corners. The die 21 has protrusions on the left and right sides of the die working zone 211, which can limit the strip 5 and prevent the strip 5 from shifting during the thinning and deep drawing process.

[0061] The U-shaped thinning deep drawing die provided by this invention, by utilizing thinning deep drawing and simultaneously employing high-precision assembly of the punch and die components, along with guiding components to ensure assembly accuracy, can significantly improve the forming accuracy of U-shaped parts, achieving near-net-shape or net-shape forming of high-precision formed parts with minimal or no cutting; improving the surface quality and service performance of formed parts, increasing material utilization, reducing energy consumption, shortening the manufacturing process, and ensuring and stabilizing the quality of formed parts; promoting low-cost, large-volume, and efficient production of high-precision formed parts, facilitating the large-scale application of precision forming technology, and driving technological progress and rapid development in precision plastic forming technology and related industries.

[0062] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A U-shaped part thinning and deep drawing forming die, characterized in that, It includes a punch assembly (1) and a die assembly (2) for thinning and drawing strips into U-shaped parts. The punch assembly (1) includes a punch (11) and the die assembly (2) includes a die (21). The outer edge of the punch (11) is provided with a plurality of punch working strips (111) and the inner edge of the die (21) is provided with a plurality of die working strips (211) corresponding to the punch working strips (111). The punch working zone (111) is a plane and is evenly distributed circumferentially along the outer edge of the punch (11), and the die working zone (211) is a plane and is evenly distributed circumferentially along the inner edge of the die (21). The planes of each pair of corresponding punch working strips (111) and die working strips (211) are parallel; The die (21) has protrusions on the left and right sides of the die working zone (211); During deep drawing, the U-shaped part abuts against both the punch working strip (111) and the die working strip (211). The inner side of the side wall of the U-shaped part abuts against the punch working strip (111), and the outer side of the side wall abuts against the die working strip (211). The distance between the die working zone (211) and the punch working zone (111) in the horizontal direction, i.e. the punch-die clearance, changes with the change of the circumferential position of the die working zone (211) in the die. The clearance between the punch and die is symmetrically set; The mold is used to draw the strip (5) into a U-shaped part (6), which includes an integrally formed sidewall (61) and bottom (62).

2. The U-shaped thinning and deep drawing die according to claim 1, characterized in that, The punch assembly (1) further includes an upper template (12), on which a punch pad (13) for loading the punch (11) is provided; the die assembly (2) further includes a lower template (22), on which a die pad (23) for loading the die (21) is provided.

3. The U-shaped thinning and deep drawing die according to claim 2, characterized in that, The upper template (12) is fixed to the forming equipment by bolt pressure plate, and a guide component (3) for guiding is provided between the upper template (12) and the lower template (22).

4. The U-shaped thinning and deep drawing die according to claim 3, characterized in that, The guide assembly (3) includes a guide post (31) and a guide sleeve (32). The guide post (31) is fixed to the edge of the lower template (22) and passes through the upper template (12). The guide sleeve (32) is fixed to the edge of the upper template (12) and slides against the guide post (31).

5. The U-shaped thinning and deep drawing die according to claim 2, characterized in that, The punch assembly (1) further includes a punch fixing plate (14), a punch connecting plate (15), and a punch fixing nut (16) for fixing the punch (11); The punch (11) is fixed to the punch connecting plate (15) by bolts. The punch connecting plate (15) abuts against the punch pad (13) and is fixed to the punch fixing plate (14) by the punch fixing nut (16). The punch fixing plate (14) is fixed to the upper template (12) by bolts.

6. The U-shaped thinning and deep drawing die according to claim 2, characterized in that, The die assembly (2) further includes a die sleeve (24) and a die pressure ring (25) for fixing the die (21); The die cavity (21) abuts against the die cavity pad (23) and is interference-fitted with the die cavity outer sleeve (24). The die cavity pressing ring (25) abuts against the die cavity outer sleeve (24) and is fixed to the lower template (22) by bolts.

7. The U-shaped thinning and deep drawing die according to claim 1, characterized in that, It also includes a discharge assembly (4) for unloading U-shaped parts.

8. The U-shaped thinning and deep drawing die according to claim 7, characterized in that, The unloading assembly (4) includes a push rod (41) and an unloading plate (42). The push rod (41) drives the unloading plate (42) to eject the U-shaped part from the die (21).

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