Forming mold for U-shaped spring

Abstract

The invention discloses a forming mold for a U-shaped spring. The forming mold comprises an upper die and a lower die, wherein the lower die comprises a lower die body, forming pin rollers, a lower die protruding block and a limiting spring; a forming cavity with an opening in the upper part is formed in the lower die body; the upper die is arranged in the forming cavity; two square holes are formed in the left side and the right side, close to the top edge, of the lower die body respectively; the forming pin rollers are arranged in the square holes in the left side and the right side respectively; and the sides, away from the middle of the lower die body, of the forming pin rollers are connected with limiting springs, and the other ends of the corresponding limiting springs are fixed to the side ends of the lower die body on the corresponding sides. According to the U-shaped spring manufactured through the method, the thickness of the formed U-shaped spring cannot be reduced, and the product force value performance of the U-shaped spring is prevented from being affected; and the U-shaped spring is prevented from being trumpet-shaped after being formed, the risk that a product is separated from a test tool when a force value is tested is prevented, and safety accidents are prevented.

Description

technical field [0001] The invention relates to a spring molding device, in particular to a U-shaped spring molding die. Background technique [0002] The existing U-shaped spring forming mold roller is fixed as a whole, and only rubs against the raw material during forming to generate rotation. The role of the roller is actually to guide and adjust the opening distance of the U-shaped spring when the U-shaped spring is formed, and to reduce the static friction between the spring steel strip and the lower mold. Since the roller is fixed as a whole, it can only rotate itself. The disadvantages are: 1. The distance between the rollers on both sides directly affects the distance between the U-shaped springs after forming, and the distance after forming directly affects the key factors whether the spring meets the requirements of the process force value. If the distance between the rollers is too small, it will cause The thickness of the U-shaped spring is squeezed, and the thi...

AI Technical Summary

Problems solved by technology

The role of the roller is actually to guide and adjust the opening distance of the U-shaped spring when the U-shaped spring is formed, and to reduce the static friction between the spring steel strip and the lower mold. Since the roller is fixed as a whole, it can only rotate itself. The disadvantages are: 1. The distance between the rollers on both sides directly affects the distance between the U-shaped springs after forming, and the distance after forming directly affects the key factors whether the spring meets the requirements of the process force value. If the distance between the rollers is too small, it will cause The thickness of the U-shaped spring is squeezed, and the thickness becomes thinner, which affects the force performance of the product. If the distance is too large, the two sides of the U-shaped spring are not perpendicular to the bottom after forming, and become a "horn" shape. 2. When forming a horn shape after forming, test the force. When the value is high, it will increase the risk of the product detaching from the test tool, resulting in a safety accident

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