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
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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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