Needles and manufacturing method thereof

Abstract

A kind of needle is disclosed, and features high antiwear performance and durability and sufficiently high bending rigidity and is used for sewing machine. Said needle is composed of handle, conic part and tip part, and made up through hardening threament, that is, the particles whose heardness is higher than that if needle matrix material are used to be sprayed onto the surface of needle.

Description

technical field [0001] The present invention generally relates to needles such as sewing needles, knitting needles or felting needles and their manufacturing methods, and more particularly to needles such as sewing needles made by hardening a metal needle base material of carbon steel by surface treatment class and its method of manufacture. Background technique [0002] In the past, it was known that, in the case of manufacturing sewing needles, the sewing needles were formed by cutting metal wires or by stamping metal wire drawing operations such as stamping operations, but in any case, in the local or After all the quenching and tempering treatments are carried out, cold rolling is carried out in combination with several machining operations or finishing operations such as grinding and grinding operations. In addition, the implemented and known methods are also included in this existing In the operation, shot peening treatment is carried out. [0003] However, the above...

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Problems solved by technology

[0003] However, the above-mentioned various operations take time, and at the same time, since several operations must be performed on various operating parts, the needles must be processed sequentially, which inevitably leads to higher costs.

[0004] In the surface treatment work in the work of forming needles using the existing metal wire rod, finishing work such as polishing and grinding is necessary work, but this work has the following disadvantages, that is, it is complicated and takes a long time, Depending on the method of operation, the strength and quality of the needles are reduced, resulting in defective products, and the waste loss is also large, productivity cannot be improved, and the manufacturing cost is high.

[0005] In addition, when heat treatment of quenching and tempering is carried out in the processing operation of forming needles, and the surface structure is subjected to shot peening treatment, compressive residual stress is generated, and the fatigue strength is increased, there is the following problem, that is, with the control of temperature , the project management becomes complicated, the cost increases, and it is difficult to obtain a very satisfactory surface hardness and fatigue strength, and the operability is also poor

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