渗碳齿轮材料磨削残余应力研究

RESIDUAL STRESSES OF GROUND CARBURIZED GEAR

通过齿轮磨削模拟试验,并采用应力测定方法,探讨了砂轮、工艺及材料对磨削残余应力的影响。研究表明:与钢玉砂轮相比,用立方氮化硼砂轮磨削,表面多呈现压应力,表下呈现拉应力,但其峰值低且范围窄;工艺参数的影响:通常展成速度和磨削深度的显著程度比轴向速度的大;在相同磨削条件下,20CrMnMo和20Cr2Ni4A两种钢较17CrNiM06钢具有较宽的拉应力范围和较高的拉应力峰值.

The effects of grinding wheel, processing parameters and types of carburized steel on residual stresses were studied by X-ray differaction method. Specimen shape of gear was designed to meet the needs of the grinding process of gear but its residual stress was easy to measure by the use of X-ray. Studies show that in comparison with corundom(GB) wheel, which forms the tensile residual stresses distributing in a wide range from the surface with fairly high magnitude, cubic borazon(CBN) wheel generally forms compressive residual stresses at the surface with a low level of tensile residual stresses beneath the surface distributing in a narrow region. The effects of grinding parameters on the forms of residual stresses were discussed. The tensile residual stresses of 20CrMnMo and 20Cr2Ni4A steels exhibit higher peek values and wider distributions than those of 17CrNiMo6 steel under the same grinding condition.