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Machining process of arc spring

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

Inactive Publication Date: 2018-11-06
JIANGSU XIANGYING HARDWARE SPRING CO LTD
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  • Abstract
  • Description
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  • 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 ensures 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 machining process for an arc spring. The machining process for the arc spring is characterized by comprising the following working procedures of spring coiling, first-time stress relieving, spring grinding, bending for the arc spring, second-time stress relieving, shot blasting, hot stressing, sorting, angle rigidity and torque testing, fatigue life testing and surface rust-proof treatment. The forming process of the arc spring is provided, and by means of the forming process, the arc spring with the free angle larger than 45 degrees can be effectively formed, it isguaranteed that the hot relaxation rate of the spring is smaller than 2 %, the instantaneous torque is large, and the fatigue life is one million times or above; and the technical problems that in theprior art, the yield of the large-angle arc spring is low, and the large-angle arc spring cannot be normally used 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 Applications(China)
IPC IPC(8): B23P15/00B21F35/00
CPCB23P15/00B21F35/00
Inventor 姚惠彬
Owner JIANGSU XIANGYING HARDWARE SPRING CO LTD
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