Flanging and punching integrated ball punch
By designing a ball-head punch for integrated flanging and punching, and using a hemispherical ball head as the cutting edge guide, the problem of concentricity between flanging and punching is solved, burrs are avoided, and the quality and efficiency of automotive mold production are improved.
Patent Information
- Application Number
- CN202520549851.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-27
AI Technical Summary
In automotive mold production, the centers of flanging and punching cannot be perfectly concentric, resulting in a high scrap rate and increased difficulty in subsequent processes. At the same time, burrs generated during the stamping process affect product quality.
Design a ball head punch for one-piece flanging and punching. Use a hemispherical ball head as the cutting edge guide to ensure concentricity. Retain a cutting edge plane around the ball head to avoid the cutting edge directly participating in the forming. Punching is achieved by the deformation of the ball head position. During punching, the cutting edge plane contacts the material for punching.
This ensures the concentricity of the punching holes, avoids burr formation, improves product quality and production efficiency, reduces economic investment, and simplifies the manufacturing process.
Smart Images
Figure CN223932403U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive cold stamping die technology, specifically relating to a ball head punch that is integrally formed by flanging and punching. Background Technology
[0002] The most important component of automotive molds is the body panel mold. These molds are mainly cold stamping dies. In a broad sense, "automotive molds" is a general term for molds used to manufacture all parts of a car. In the production process of automotive body panels, stamping dies are an indispensable production tool. In traditional manufacturing, the process of forming the riveting hole position of the stamped part is first pre-formed by a set of molds, and then a set of molds punches holes on the formed part.
[0003] However, in the actual mold production and debugging process, the requirements for the positioning accuracy and processing error of the stamping die are extremely high. The center of the flanging and the center of the punching cannot be completely concentric, resulting in a large number of scraps or increasing the difficulty of subsequent work and affecting product quality. A further process is to realize flanging and punching with a single punch. However, during the stamping process, the cutting edge participates in the forming deformation of the sheet metal, resulting in obvious burrs on the final product that cannot be eliminated. This also has an adverse effect on subsequent processes, such as uneven riveting and poor air tightness. Therefore, a ball head punch that can form flanging and punching in one piece is needed to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to provide a ball head punch that is integrally formed by flanging and punching, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a ball head punch integrally formed by flanging and punching, comprising a ball head, a cutting edge, a punch body, a top pin, and a spring. The bottom end of the punch body is connected to the ball head and the cutting edge. The cutting edge is located on the outside of the ball head. The top pin and the spring are connected within the punch body. The top pin is connected to the spring and is located inside the ball head.
[0006] By setting the above structure, the punch can ensure the concentricity of the punched holes, and the punched edge will not produce burrs. It has a simple structure, is easy to manufacture, and has good stability. It can greatly reduce the economic investment in the production of automotive body panels, and significantly improve product quality and production efficiency.
[0007] As a preferred embodiment, the ball head overlaps with the sheet metal, the bottom of the ball head overlaps with the sheet metal (hide), and the lower surface of the sheet metal overlaps with the die sleeve.
[0008] As a preferred embodiment, the ball head is set to be semi-circular, and the radius of the ball head is 1mm smaller than the cross-sectional radius of the cutting edge. The radius of the ball head can be adjusted appropriately according to requirements.
[0009] As a preferred option, the height of the ball head can be designed to be 2mm-6mm, depending on the specific requirements of the sheet material to be formed.
[0010] As a preferred embodiment, the edge of the punching cutting edge is provided with a flat surface of 0.5mm-2mm for punching holes.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] This invention, by setting a hemispherical ball head, ensures that during the stamping process, the ball head is the first to contact the sheet metal being stamped, causing the sheet metal to deform until it fully meets the forming requirements. This completely avoids the sharp edges of the punch's cutting edge from participating in the forming process. Furthermore, because a cutting edge plane is retained around the ball head, after the ball head has completed its forming work, when the die moves further down, this cutting edge plane reaches the critical working point. At this point, the punch begins to contact the material, instantly cutting the sheet metal without generating burrs. This ensures that the cut sheet metal will not adversely affect subsequent processes. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the punch of this utility model;
[0014] Figure 2 This is a structural schematic diagram of the punch forming process of this utility model;
[0015] Figure 3 This is a schematic diagram of the structure of the punch stamping product of this utility model.
[0016] In the diagram: 1. Ball head; 2. Cutting edge; 3. Punch body; 4. Ejector pin; 5. Spring; 6. Sheet metal; 7. Die sleeve. Detailed Implementation
[0017] The present invention will be further described below with reference to the embodiments.
[0018] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.
[0019] Please see Figure 1-3This utility model provides a ball head punch with one-piece flanging and punching, including a ball head 1, a cutting edge 2, a punch body 3, a ejector pin 4 and a spring 5. The bottom end of the punch body 3 is connected to the ball head 1 and the cutting edge 2. The cutting edge 2 is located on the outside of the ball head 1. The ejector pin 4 and the spring 5 are connected inside the punch body 3. The ejector pin 4 is connected to the spring 5 and is located inside the ball head 1.
[0020] By setting the above structure, the punch can ensure the concentricity of the punched holes, and the punched edge will not produce burrs. It has a simple structure, is easy to manufacture, and has good stability. It can greatly reduce the economic investment in the production of automotive body panels, and significantly improve product quality and production efficiency.
[0021] Ball head 1 overlaps with sheet metal 6, the bottom of ball head 1 overlaps with sheet metal 6, and the lower surface of sheet metal 6 overlaps with die sleeve 7. Ball head 1 is set as semi-circular, and the radius of ball head 1 is 1mm smaller than the cross-sectional radius of the punching edge 2. The radius of ball head 1 can be adjusted appropriately according to requirements. The height of ball head 1 can be designed as 2mm-6mm according to the specific requirements of sheet metal 6 to be formed. The edge of punching edge 2 is provided with a flat surface of 0.5mm-2mm for punching holes.
[0022] The working principle and usage process of this utility model are as follows: The sheet metal 6 is placed above the die sleeve 7, and then the punch is pressed down. The downward-moving punch drives the ejector pin 4 to contact the sheet metal 6. When the punch continues to move downward, the ejector pin 4 will compress the spring 5. When the ball head 1 at the bottom of the punch contacts the sheet metal 6, the sheet metal 6 will deform until it fully meets the forming requirements. This completely avoids the sharp edge of the punch cutting edge from participating in the forming. Since the cutting edge plane is retained around the ball head 1, after the ball head 1 is responsible for forming, when the punch moves further downward, this part of the cutting edge plane just reaches the working critical point. At this time, the punching cutting edge 2 of the punch begins to contact the material, and the punching cutting edge 2 punches the sheet metal 6 instantly.
[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A ball-head punch integrally formed by flanging and punching, comprising a ball head (1), a cutting edge (2), a punch body (3), an ejector pin (4), and a spring (5), characterized in that: The bottom end of the punch body (3) is connected to the ball head (1) and the cutting edge (2). The cutting edge (2) is located on the outside of the ball head (1). The ejector pin (4) and the spring (5) are connected inside the punch body (3). The ejector pin (4) is connected to the spring (5). The ejector pin (4) is located inside the ball head (1).
2. The ball head punch with integrated flanging and punching according to claim 1, characterized in that: The ball head (1) overlaps with the plate (6), the bottom of the ball head (1) overlaps with the plate (6), and the lower surface of the plate (6) overlaps with the die sleeve (7).
3. The ball head punch with integrated flanging and punching according to claim 1, characterized in that: The ball head (1) is set as a semi-circle, and the radius of the ball head (1) is 1 mm smaller than the cross-sectional radius of the cutting edge (2). The radius of the ball head (1) can be adjusted appropriately according to the requirements.
4. A ball-head punch integrally formed by flanging and punching according to claim 1, characterized in that: The height of the ball head (1) can be designed to be 2mm-6mm according to the specific requirements of the sheet material (6) to be formed.
5. A ball-head punch integrally formed by flanging and punching according to claim 1, characterized in that: The edge of the punching cutting edge (2) is provided with a flat surface of 0.5mm-2mm for punching holes.