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Processing technology of arc-shaped spring

A processing technology, arc-shaped technology, applied in the field of arc-shaped spring processing technology, can solve the problems of low yield, high instantaneous torque, and abnormal use, etc., and achieve high molding rate, long fatigue life, and easy control of parameters.

Active Publication Date: 2014-12-24
HANGZHOU FUCHUN SPRING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The invention provides a forming process of an arc-shaped spring that can effectively form an arc-shaped spring with a free angle greater than 45 degrees, and ensure that the thermal relaxation rate of the spring is less than 2%, the instantaneous torque is large, and the fatigue life of the arc-shaped spring is more than 1 million times; it solves the problem The high-angle arc springs in the prior art have a low yield and cannot be used normally

Method used

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Embodiment

[0042]A processing technology for arc springs, which uses OTEVA 75SC material as the raw material for processing, checks the raw materials and eliminates unqualified products, and rolls the spring. The spring coiling is carried out on a computer numerical control spring coiling machine with more than four axes. The steel wire blank is wound into a cylindrical coil spring by tightening the two ends of the spring according to the prefabricated height, outer diameter and number of turns. After coiling the spring, keep the annealing temperature at 410°C in the tempering furnace for stress relief annealing, the holding time is 60 minutes, and the residual stress on the surface of the spring is less than 150Mpa. After annealing, grind the two ends of the spring, the grinding angle is 270~330 degrees, and the remaining thickness of the end is greater than 0.15d (d is the diameter of the steel wire). The effective coils of the spring are separated one by one, so that the pitch on one ...

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Abstract

The invention relates to a processing technology of a large-radian arc-shaped spring. The processing technology is characterized by comprising the following procedures of: spring coiling: primary stress relief annealing; spring grinding; spring bending into an arc-shaped spring; secondary stress relief annealing; shot blasting; hot-strong pressing; sorting; angular rigidity and torque test; fatigue life test; and surface antirust treatment. According to the forming technology of the arc-shaped spring provided by the invention, the arc-shaped spring with the free angle of being more than 45 degrees can be effectively formed, the thermal relaxation rate of the spring is less than 2%, the instantaneous torque is large, the fatigue life is 1 million times, and the technical problems of low finished product rate and incapability for normal use of the large-radian arc-shaped spring in the prior art are solved.

Description

technical field [0001] The invention relates to a manufacturing process of a spring, in particular to a processing technology of a large arc arc spring. Background technique [0002] As a widely used elastic element, springs are mostly cylindrical in shape. The production and processing can be divided into cold coil forming and hot coil forming. The main processing steps of cold coil forming are coil spring→stress relief annealing→end surface grinding→ (Chamfering)→Shot blasting→Standing treatment→Surface treatment→Packaging, etc. [0003] In order to better match its assembly space, the spring is also designed to be non-cylindrical, such as the spring used for the dual-mass flywheel of an automobile. The processing technology of this spring is not exactly the same as that of the cylindrical spring. [0004] For example, the Chinese patent No. CN101092014A was announced on December 26, 2007, and the name is a manufacturing process and special equipment for an arc spring us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C21D1/30C21D7/06C21D9/02
Inventor 邵文武
Owner HANGZHOU FUCHUN SPRING
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