High-strength, high-size-precision and good-coaxiality accurate grinding bar cold drawing production technology

Abstract

The invention relates to a high-strength and high-precision cold drawing accurate grinding bar production technology. After a bar produced through a continuous casting and rolling technology is subjected to cold drawing, roundness is greatly improved, meanwhile, the strength of the bar is improved, and the needed mechanical performance is obtained. In addition, a machining hardening layer is formed on the surface, wear resistance of the surface of the bar can be improved, and the accurate grinding bar is obtained after rough grinding and accurate grinding machining, wherein the size precision is h7, the three-point out-of-roundness is smaller than a half of the tolerance, and the surface roughness is smaller than or equal to Ra 0.2 microns.

Description

technical field [0001] The invention relates to a production method of cold-drawn and fine-ground rods. After the material is cold-drawn and ground, a fine-ground rod with certain mechanical properties, high dimensional accuracy, good coaxiality and excellent surface quality is produced . Background technique [0002] Finely ground rods are generally used in the production of piston rods, cylinder rods, shaft pins, etc., as key components for reciprocating motion or sliding, which require high dimensional accuracy, coaxiality, and surface quality. It affects the service life of cylinders, hydraulic cylinders, connecting parts, etc. For example, the basic feature of the cylinder rod is a slender shaft, which cooperates with the cylinder for relative movement during work. The out-of-roundness of the cylinder rod determines the degree of sealing with the cylinder, surface hardness and The roughness determines the wear resistance of the cylinder rod, and the processing technolo...

AI Technical Summary

Problems solved by technology

[0003] Fine grinding of finely ground rods is the key process of manufacturing finely ground rods, but fine grinding has high requirements on the rods, especially the out-of-roundness, and the rods with poor out-of-roundness cannot be finely ground, even Not even kibble

[0004] Fine grinding rod parts are generally produced by turning. Both ends of the rod need to be clamped or bored in the center hole. After the processing is completed, the head and tail are cut off. The production efficiency is low. If the processing method is not appropriate for longer rods, it is easy to It is difficult to meet the coaxiality requirements caused by the deformation of the bar, and the strength of the bar is also difficult to be guaranteed, and even waste products are generated.

[0005] At present, there is also a cold drawing process to produce bars, but it needs to be combined with annealing treatment, and the straightness of the product still cannot meet the requirements

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