High precision cotton spinning ring using low hardness steel material as base body and its manufacture method

Abstract

The invention relates to a high precision cotton spinning ring which uses low hardness steels as a base and process for preparation, wherein the steels whose rockwell hardness is equal or lesser than 65 is minutely processed into the ring base according to a needed shape of a ring, a high hardness wear resistant layer is coated on the ring base, the thickness D of the high hardness wear resistant layer is equal or greater than 1micron and is equal or lesser than 30 micron. The process for preparation is that the steels are orderly processed into ring blank through blanking, then the ring blank is processed into the ring base whose spherical degree is lower than 40 micron and smoothness is lower than 10 micron through rough turning and finish turning, and then a product is obtained through the surface hardening wear-resistant treatment of the ring base. The invention overcomes technology bias, both is capable of observably improving the precision of the cotton spinning ring, and meets the requirements of high hardness wear resistance lubrication of the surface of the cotton spinning ring. The process for preparation not only has simple process and very easiest operation, but also observably reduces the manufacturing cost, and prolongs the service life of the cotton spinning ring.

Description

(1) Technical field [0001] The invention relates to a steel ring and a manufacturing method thereof, in particular to a cotton spinning steel ring used on a spinning machine in the cotton spinning industry and a manufacturing method thereof. (two), background technology [0002] The existing cotton spinning steel ring generally uses steel with a Rockwell hardness HRA greater than 81.5 as the steel ring base, and the surface treatment is carried out on the steel ring base so that it is coated with a hardened wear-resistant layer. The biggest shortcoming of this kind of cotton spinning steel ring is the poor precision. The roundness of most products is about 100 microns, and the flatness is about 60 microns. Some products even have a roundness of up to 250 microns and a flatness of up to 120 microns, such a poor precision product will inevitably lead to very poor consistency and stability of work, and the traveler and steel ring will often be damaged, the yarn breakage rate is...

AI Technical Summary

Problems solved by technology

The purpose of carburizing heat treatment, spherical annealing, quenching and tempering is to increase the hardness of the steel ring matrix. Regardless of whether the above steps 4 and 5 are done in full or in part, although the hardness of the steel ring matrix can be improved, but , because they are all carried out at high temperature, therefore, the steel ring matrix with high precision and low hardness processed in steps 1, 2 and 3 inevitably undergoes geometric thermal deformation, which significantly reduces the precision of the steel ring. This is the root cause of poor precision of cotton spinning steel rings

[0014] The traditional production method of cotton spinning steel ring not only seriously affects the precision of the product, but also has the disadvantages of complicated process, high labor intensity and high processing cost. For now, the cost of processing a cotton spinning steel ring is higher than 1.1 yuan RMB

[0015] Those skilled in the art have always been eager but have not been able to solve the above technical problems successfully. The reason for this is that the production methods in the past have generally caused technical prejudice to the technicians.

In the initial stage of steel ring production, the metal surface treatment technology is limited to surface lubrication treatment. If the low hardness steel is processed into a cotton ring, the friction coefficient between the steel ring and the traveler is very low due to the rough surface of the low hardness steel. When the ingot speed is high, the frictional heat between the steel ring and the traveler is very serious, which not only burns the traveler, but also produces thermal wear, which seriously damages the surface of the steel ring with low hardness and seriously affects Spinning performance

Therefore, the technicians clearly understand that the steel ring base must be made of high-hardness steel. However, the problem has arisen again. The high-hardness steel is very difficult to process, and the machining accuracy is very poor. It cannot meet the technical requirements of spinning production. For this problem, technicians first use low-hardness steel to process a high-precision steel ring matrix, and then undergo carburizing, quenching, tempering and other processes to increase the hardness of the steel ring matrix. The Rockwell hardness must meet HRA higher than 81.5

With the continuous development of metal surface treatment technology, at present, metal surface treatment technology can not only wear and lubricate the surface, but also fully improve the hardness of the metal surface. Its Rockwell hardness can far meet the requirements of HRA≥81.5. However, technicians generally have a technical prejudice that "the hardness of the steel ring base must be high", which makes technicians eager to solve the problem of poor precision caused by high-temperature heat-treated steel rings, but has never been successful.