南京航空航天大学学报2012，Vol.44Issue(2)：228-232,5.
工件底孔直径对Q460高强度钢冷挤压内螺纹的影响
Effect of Hole Diameter of Work on Q460 High-Strength-Steel Internal Thread Formed by Cold Extrusion
摘要
Abstract
The effect of hole-diameter of the work on Q460 high-strength-steel internal thread formed by cold extrusion is studied. And the changes of thread form, surf ace residual stress, hardness and surface topography of head face caused by different hole-diameter are investigated. The results show that the accumulation body of the head face of the internal thread formed by cold extrusion is higher on both sides, in the middle of the depressed shape form low. With the decreased hole-diameter of the work, the stack height of the head face is increasing, and the accumulated level is also becoming serious. The hardness and the residual pressure stress at crest, flank and root of the thread are increased. For ensuring the quality of the thread and the tap life, the hole-diameter of the work should select maximum value as far as possible. But it is unnecessary to pursue the highest thread high rate, otherwise extrusion forming of internal thread is attended with much difficulty. The best range of hole-diameter of Q460 high-strength-steel work is between 021. 20 mm and 021- 30 mm, the thread high rate exceeds 80%, and it completely meets the requrement of the quality of the thread.关键词
内螺纹/底孔直径/残余应力/硬度Key words
internal thread/ hole-diameter/ residual stress/ hardness分类
矿业与冶金引用本文复制引用
缪宏,左敦稳,张瑞宏,王珉,汪洪峰..工件底孔直径对Q460高强度钢冷挤压内螺纹的影响[J].南京航空航天大学学报,2012,44(2):228-232,5.基金项目
国家高技术研究发展计划(“八六三”计划)(SQ2008AA10XK1468859)资助项目. （“八六三”计划）
