锻压技术

近净成形在滑履零件上的应用

英文标题：Application of near net shape process on the sliding parts

作者：周艳郜愿愿

关键词：滑履零件近净成形加工冷挤压

分类号：

出版年,卷(期):页码：2014,39(7):5-9

摘要：

运用正挤压一次成形的“近净成形加工”技术，对航空液压泵中球面滑履零件实现了冷挤压的批量生产，通过对冷挤压件的尺寸精度及粗糙度的检验表明，该冷挤压件能实现球面尺寸IT7级精度和表面粗糙度Ra0.4 μm的技术要求。对采用冷挤压与车削加工后的滑履零件进行硬度、金相组织、耐磨性等实验，结果显示，相对于车削加工而言，冷挤压后零件的表面硬度（拉伸强度）提高约35％，耐磨性能提高60％以上，节约材料50%以上，材料利用率达到90％，成形时间由车削加工时的每件3.5 min降低到15 s，加工效率显著提高。

Using“near net shape processing” technology of direct extrusion once forming，batch production for cold extrusion of spherical slipper parts of aviation hydraulic pump was realized.By examining the size precision and roughness of the cold extrusion, the technical requirements of IT7 level precision of sphere size and surface roughness Ra0.4 μm were met. The tests of hardness，metallographic structure，and abrasion resistance etc. for spherical slipper parts produced by cold extrusion and turning were conducted.The results show that compared to turning parts，by using cold extrusion，the surface hardness (tensile strength) is improved by about 35%，the wear resistance is improved by above 60%；the material utilization rate reaches 90% which saves materials by above 50%；and the forming time is reduced from 3.5 min for each part when turning to 15 s which improves the machining efficiency significantly.

基金项目：

贵州省科技计划课题（黔科合GY字（2006）3001 ）

周艳（1967-），女，学士，高级工程师

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