高速冷滚打成形花键表面加工硬化试验

发布时间：2019-04-09 10:12

【摘要】：以渐开线花键为研究对象,进行了高速冷滚打成形工件的显微硬度和扫描电镜试验,分析了同一工艺参数下花键不同位置表层硬度随深度的变化趋势,花键的表面硬化程度和微观组织随不同工艺参数的变化规律。试验结果表明:同一工艺参数下,齿顶、分度圆和齿根的表层硬度均随着与齿面距离的增大总体趋于减小,基体硬度为238.5 HV,花键表面形成明显的加工硬化层,齿顶处表面硬度值最小,且硬化层最浅;齿根部分表面硬度略低于分度圆处的表面硬度,硬化层达到1.5 mm;成形花键的表面加工硬化程度,在同一转速下,随着进给量的增大而上升,在同一进给量下,随着转速的增大而下降。
[Abstract]:By using the involute spline as the research object, the micro-hardness and the scanning electron microscope test of the workpiece with high-speed cold rolling are carried out, and the variation trend of the surface hardness with the depth of the spline at different positions of the spline under the same process parameters is analyzed. The surface hardening degree and microstructure of the spline function with different process parameters. The experimental results show that, under the same process parameters, the surface hardness of the tooth top, the index circle and the tooth root tends to decrease with the increase of the distance from the tooth surface, the hardness of the matrix is 238.5HV, the surface of the spline forms an obvious work-hardening layer, the surface hardness value at the top of the tooth is the smallest, and the hardening layer is the most shallow; The hardness of the surface of the root portion is slightly lower than the surface hardness at the index circle, the hardened layer is 1.5 mm, the surface work hardening degree of the forming spline is increased with the increase of the feeding amount at the same rotating speed, and the surface hardness of the tooth root portion decreases with the increase of the rotation speed under the same feeding amount.
【作者单位】：河南科技大学机电工程学院;中国船舶重工集团公司第七二五研究所;
【基金】：国家自然科学基金资助项目(51475146,51475366)
【分类号】：TG306

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