Processing and manufacturing method of cylinder body prepared from alloyed tool steel 5CrNiMn material

Abstract

The invention discloses a processing and manufacturing method of a cylinder body prepared from an alloyed tool steel 5CrNiMn material and belongs to the technical field of integrated machining. The cylinder body is characterized in that a billet is obtained by forging forming; the billet is subjected to annealing to remove internal stress and subsequently undergoes machining, carbonitriding, deposition treatment and shot peening strengthening; multiple times of upsetting are performed in the forging process of a cylinder body blank, so that the tearing of a forge piece is avoided, structures become uniform and crystal grains are refined; upset billets are formed on an upset place, so that metal is reasonably distributed and is well fully fills a die cavity; the cylinder body is machined by turning, boring and honing; in the processing process, trace atomized tiny water droplet cutting fluid is fed to a cutting zone through low-temperature cold air for cooling and lubricating, so that the outflow direction of a rotary tool is identical with that of cutting chips, the circumferential speed of a cutting edge is greater than the outflow speed of the cutting chips, and further the formation of mechanical tumors is avoided; and then surface treatment and deposition treatment are performed on an engine cylinder body. The cylinder body processed by the manufacturing method is high in wear resistance and long in service life; in addition, the precision accords with standards; and meanwhile, the hardness and bending strength of cylinder body surface are also improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive mechanical processing, and the invention relates to an alloy tool steel 5CrNiMn and a cylinder body thereof. In particular, a method for processing and manufacturing a cylinder block made of alloy tool steel 5CrNiMn. Background technique [0002] As far as processing materials are concerned, there have always been many differences in the processing performance of alloy tool steels at home and abroad. Developed countries have carried out research on the machinability of alloy tool steel materials as early as forty years in the last century. After decades of research and development, the machinability of high-strength alloy tool steel has been significantly improved. Compared with foreign forgings, there is no obvious difference in the dimensional deviation, machining allowance, surface quality, white corners, hard spots, etc. of the processed forgings, and there is no abnormality in the stre...

AI Technical Summary

Problems solved by technology

Developed countries have carried out research on the machinability of alloy tool steel materials as early as forty years in the last century. After decades of research and development, the machinability of high-strength alloy tool steel has been significantly improved. Compared with foreign forgings, there is no obvious difference in the dimensional deviation, machining allowance, surface quality, white corners, hard spots, etc. of the processed forgings, and there is no abnormality in the strength, hardness, and metallographic structure of the forging materials, and The processing tool wears a lot, the processing time is long, and the surface roughness of the forging is poor. Taking the engine cylinder casting as an example, the service life of the tool when processing the domestic cylinder block is much lower than that of the imported cylinder block, which not only seriously reduces the The production efficiency is improved, and at the same time, the loss of the tool is significantly increased, which greatly increases the cutting processing cost

As far as the processing technology is concerned, the previous cutting lubricants are chemical substances, many of which are toxic, seriously affecting the health of workers, and the waste cutting fluid also pollutes the environment. Generally, during the processing process, due to the reciprocating motion of cutting tools Or eccentric movement, so it is necessary to prepare special cutting tools, resulting in increased costs, or the processing time is prolonged or the processing accuracy is reduced due to redundant movements of cutting tools