Automobile electric horn contact steel discs and processing method for same

Abstract

The invention discloses automobile electric horn contact steel discs and a processing method for same. Specifically, the two side surfaces of each contact steel disc are arc surfaces, and the arc surfaces are tangent to the two crossed surfaces. The contact steel discs are made of stainless steel whose hardness is HV370-540. The roughness of each arc surface is less than Ra3.2. The thickness of each contact steel disc is 0.4mm-0.7mm. The invention also discloses the processing method for the automobile electric horn contact steel discs. The method comprises following steps: A. cutting the stainless steel into long strips according to the width of the automobile electric horn contact steel discs; B. edging the two surfaces of each long strip steel disc to form the arc surfaces, wherein the arc surfaces are tangent to the crossed two surfaces; C. enabling the roughness of each arc surface to be less than Ra3.2 through processing; and D. punching the long strip stainless steel, enabling the long strip stainless steel to have shapes of the automobile electric horn contact steel discs, and not cutting the two side surfaces of the long strip stainless steel. The automobile electric horn contact steel discs are reasonable in structure, moderate in cost and long in service lifetime, and save materials.

Description

technical field [0001] The invention relates to an automobile electric horn contact steel sheet and a processing method thereof. Background technique [0002] Automobile electric horn is a necessary signal device for safe driving of automobiles. With the implementation of the 2013 version of the three-package law for automobiles, automobile OEMs have higher and higher requirements for the quality and reliability of electric horns. Automobile manufacturers require 3 years or 50,000 kilometers. During the three-guarantee period, the fracture of the contact steel sheet of the electric horn is one of the main failure modes of the electric horn. Once broken, the electric horn cannot make a sound, which has hidden dangers to driving safety; [0003] When the automobile electric horn contact steel sheet is made according to the existing technology, the roughness of the cross-section on both sides is not ideal, generally only reaching Ra 12.5, and the burrs are large. If it is inc...

AI Technical Summary

Problems solved by technology

[0002] Automobile electric horn is a necessary signal device for safe driving of automobiles. With the implementation of the 2013 version of the three-package law for automobiles, automobile OEMs have higher and higher requirements for the quality and reliability of electric horns. Automobile manufacturers require 3 years or 50,000 kilometers. During the three-guarantee period, the fracture of the contact steel sheet of the electric horn is one of the main failure modes of the electric horn. Once broken, the electric horn cannot make a sound, which has hidden dangers to driving safety;

[0003] When the automobile electric horn contact steel sheet is made according to the existing technology, the roughness of the cross-section on both sides is not ideal, generally only reaching Ra 12.5, and the burrs are large. If it is increased to 50 times, obvious jagged gaps can be seen; During the working process of the electric horn, the contact steel plate vibrates at high frequency, which is easy to generate stress at the jagged gap, and eventually breaks due to excessive stress concentration;

[0004] The material of the contact steel sheet is generally made of spring steel strip or stainless steel. When the spring steel strip is selected, in order to prevent the material from oxidizing and rusting, surface treatment is required. During the pickling and electroplating process, it is easy to cause incomplete dehydrogenation and hydrogen embrittlement. Fracture, or corrosion pits on the surface of the material, and fatigue fractures along the corrosion pits;

[0005] In recent years, some electric horn manufacturers have introduced non-contact electronic electric horns, which solve the problems of contact ablation and contact steel sheet breakage, but the electronic module will fail, causing the electric horn to fail. The cost is too high and the production cycle is long, so it has not been widely used at present

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