Negative angle punch for optimizing deformation of aluminum alloy flanging riveting hole

Abstract

The utility model provides a negative angle punch for optimizing deformation of an aluminum alloy flanging and riveting hole. The negative angle punch comprises a punch body. A punching part and a hole flanging part are arranged at the lower end of the punch body, the hole flanging part is located at the upper end of the punching part and connected with the punching part, the punching part comprises a straight-edge punch and a negative-angle part, and the negative-angle part is located above the straight-edge punch and connected with the straight-edge punch. The utility model relates to the field of stamping dies, in particular to a negative angle punch for optimizing deformation of an aluminum alloy flanging and riveting hole, which reduces friction between the punch and a material in the punching and flanging process by optimizing a flanging punch into a negative angle punch, thereby ensuring the influence of the punch on a flanged hole surface in the ascending process and improving the quality of parts.

Description

Technical Field

[0001] The utility model relates to the field of stamping dies, in particular to a negative angle punch for optimizing the deformation of aluminum alloy riveting holes. Background Art

[0002] With the urgent demand for lightweight car bodies, aluminum alloys have begun to attract widespread attention and are widely used due to their light weight, high strength, and excellent thermal conductivity. However, the automotive industry has particularly strict requirements for the size and appearance quality of aluminum parts. Based on the actual development of aluminum parts, it is found that aluminum alloys often suffer from poor quality due to deformation during the punching process. To address this problem, the requirements of riveting technology for the riveting holes of stamped parts are more stringent. In particular, when the riveting punching process is completed in the first sequence, the traditional method of using a punch to complete the punching often produces surface fluctuations at the punching location, affecting the riveting quality. Summary of the Invention

[0003] In view of this, the utility model aims to propose a negative angle punch for optimizing the deformation of aluminum alloy riveting holes, so as to solve the poor quality phenomenon of the riveting hole deformation when the aluminum alloy is subjected to the punching process.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] A negative angle punch for optimizing the deformation of aluminum alloy rivet holes comprises a punch body, wherein the lower end of the punch body is provided with a punching portion and a punching portion, wherein the punching portion is located at the upper end of the punching portion and connected to the punching portion, and the punching portion comprises a straight-side punch and a negative angle portion, wherein the negative angle portion is located above the straight-side punch and connected to the straight-side punch.

[0006] Furthermore, the shape of the negative corner portion in front view is trapezoidal, and the straight-edge punch is cylindrical;

[0007] The upper end face of the straight-edge punch is connected to the lower end face of the negative angle portion, and the diameter of the upper end face of the straight-edge punch is equal to the diameter of the lower end face of the negative angle portion. The diameter of the upper end face of the negative angle portion is smaller than the diameter of the lower end face of the negative angle formed. The upper end face of the negative angle portion is connected to the lower end face of the hole-turning portion and is equal to the diameter of the lower end face of the hole-turning portion.

[0008] Furthermore, the cylindrical upper surface of the hole-turning portion is connected to the punch body, and an arc-shaped transition exists between the upper end surface and the lower end surface of the hole-turning portion.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] The negative angle punch for optimizing the deformation of aluminum alloy riveting holes described in the utility model optimizes the punch for making the hole-turning punch into a negative angle punch, thereby reducing the friction between the punch and the material during the punching and hole-turning process, thereby ensuring the impact of the punch on the hole-turning surface during the upward process and improving the quality of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 Schematic diagram of a negative angle punch for optimizing the deformation of aluminum alloy rivet holes according to an embodiment of the present invention;

[0013] Description of reference numerals:

[0014] 1. Punch body; 2. Straight-edge punch; 3. Hole-turning part; 4. Negative angle part. DETAILED DESCRIPTION

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0018] This embodiment relates to a negative-angle punch for optimizing the deformation of aluminum alloy riveting holes. By optimizing the riveting punch to a negative-angle punch, the friction between the punch and the material can be reduced during the punching and riveting process, thereby ensuring the impact of the punch on the riveting surface during the upward process and improving the quality of parts.

[0019] Based on the above design concept, an exemplary structure of the negative angle punch for optimizing the deformation of the aluminum alloy rivet hole in this embodiment is as follows: Figure 1 As shown, it mainly includes a punch body 1. The lower end of the punch body 1 is provided with a punching part and a turning part 3. The turning part 3 is located at the upper end of the punching part and is connected to the punching part. The punching part includes a straight-edge punch 2 and a negative angle part 4. The negative angle part 4 is located above the straight-edge punch 2 and is connected to the straight-edge punch 2.

[0020] The shape of the negative angle portion 4 in the front view is trapezoidal, and the straight-edge punch 2 is cylindrical; the upper end face of the straight-edge punch 2 is connected to the lower end face of the negative angle portion 4, and the diameter of the upper end face of the straight-edge punch 2 is equal to the diameter of the lower end face of the negative angle portion 4, the diameter of the upper end face of the negative angle portion 4 is smaller than the diameter of the lower end face of the negative angle formed, and the upper end face of the negative angle portion 4 is connected to the lower end face of the hole-turning portion 3 and is equal to the diameter of the lower end face of the hole-turning portion 3.

[0021] The cylindrical upper surface of the hole-turning portion 3 is connected to the punch body 1 , and there is an arc-shaped transition between the upper end surface and the lower end surface of the hole-turning portion 3 .

[0022] When the negative-angle punch for optimizing the deformation of aluminum alloy rivet holes described in this embodiment is in use, the straight-edge punch 2 of the punch body 1 first contacts the sheet material. During the continued downward pressure of the punch body 1, the straight-edge punch 2 presses down to pre-form the sheet material, and the flanging portion 3 pre-presses and flangs the rivet hole. During the continued descent of the punch body 1, the blanking is completed. At the same time, the pre-pressed flanging of the rivet hole will follow the flanging portion 3, that is, the arc groove, for a back-pressure transition. The arc groove will cause the flanging to produce an R-rounded corner during the pressure process, making the product smoother after riveting.

[0023] The negative angle punch for optimizing the deformation of aluminum alloy riveting holes according to the above implementation scheme is well realized, which reduces the friction between the punch and the material during the punching and riveting process, thereby ensuring the impact of the punch on the riveting surface during the upward process and improving the quality of parts.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative angle punch for optimizing the deformation of aluminum alloy riveting holes, comprising a punch body (1), characterized in that: The lower end of the punch body (1) is provided with a punching portion and a hole-turning portion (3), the hole-turning portion (3) is located at the upper end of the punching portion and is connected to the punching portion, the punching portion comprises a straight-edge punch (2) and a negative angle portion (4), the negative angle portion (4) is located above the straight-edge punch (2) and is connected to the straight-edge punch (2); The negative angle portion (4) is in a trapezoidal shape in a front view, and the straight-edge punch (2) is in a cylindrical shape; The upper end face of the straight-edge punch (2) is connected to the lower end face of the negative angle portion (4), and the diameter of the upper end face of the straight-edge punch (2) is equal to the diameter of the lower end face of the negative angle portion (4). The diameter of the upper end face of the negative angle portion (4) is smaller than the diameter of the lower end face of the negative angle formed. The upper end face of the negative angle portion (4) is connected to the lower end face of the punching portion (3) and has the same diameter as the lower end face of the punching portion (3).

2. The negative angle punch for optimizing the deformation of aluminum alloy rivet holes according to claim 1 is characterized in that: The cylindrical upper surface of the hole-turning portion (3) is connected to the punch body (1), and an arc-shaped transition exists between the upper end surface and the lower end surface of the hole-turning portion (3).

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