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

A technology of dimensional accuracy and production process, which is applied in the field of cold drawing production process of finely ground rods with high strength, high dimensional accuracy and good coaxiality, can solve the problems of bar deformation, low production efficiency, and waste products, and achieve enhanced surface Hardness and wear resistance, improvement of three-point out-of-roundness, effect of preventing bending after quenching

Active Publication Date: 2017-11-17
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 productio

Method used

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

Examples

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[0024] Example

[0025] The material is 1018 steel in ASTM A29 standard:

[0026] 1) Material selection: Select Φ36mm black-skin rolled material for flaw detection one by one, the surface shall be subjected to magnetic flux leakage detection of ≤0.3mm defect depth, and the interior shall be subjected to ASTM A388 standard FBH=1.6mm ultrasonic flaw detection. End sharpening, surface shot blasting and other treatments are performed on the rolled material to prepare for cold drawing.

[0027] 2) Drawing: According to the requirements of the mechanical properties of the finished product, the surface reduction rate of cold drawing is set to 16%, and the drawing eye mask corresponding to the aperture of Φ33mm is selected for drawing, and the drawing speed is 8m / min. After drawing, the mechanical properties are tested. Satisfy Rp 0.2 ≥483Mpa, Rm≥552Mpa, A≥14% requirement.

[0028] 3) Wagon and straightening: pre-straighten the drawn material, control the straightness ≤1mm / m, the t...

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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...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 胡绍鑫邵淑艳许晓红冀鸰黄镇聂爱诚孔祥伟刘学文
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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