Fabrication of miniature helical gears by powder extrusion using gas atomized Zn-22%Al powder  

采用气雾化Zn-22%Al粉末挤压制造微型螺旋齿轮(英文)

作　　者：LEE Kyung-Hun LEE Jung-Min PARK Joon-Hong KIM Byung-Min 

机构地区：[1]Precision Manufacturing Systems Division,Pusan National University,30 Jangjeon-Dong,Kumjeong-Gu,Busan 609-735,Korea [2]Dongnam Regional Division,Korea Institute of Industrial Technology,1274 Jisa-dong,Gangseo-gu,Busan 618-230,Korea [3]Department of Mechanical Engineering,DONG-A University,840 Hadan 2-dong,Saha-gu,Busan 604-714,Korea [4]Engineering Research Center for Net Shape and Die Manufacturing,Pusan National University,30 Jangjeon-Dong,Kumjeong-Gu,Busan 609-735,Korea

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第6期1313-1321,共9页中国有色金属学报（英文版）

基　　金：Project (2010-0008-277) supported by the NCRC (National Core Research Center) Program through the National Research Foundation of Korea,funded by the Ministry of Education,Science,and Technology;Project (NRF-2009-K20601000004-09E0100-00410) supported by PNU-IFAM JRC

摘　　要：Powder extrusion, which is based on the superplastic behavior of Zn-22%A1 eutectoid alloy, was proposed to reduce the forming load and promises to provide fine microstructures in the manufacture of miniature helical gears. The specifications of the helical gears were as follows： module, 0.3; number of teeth, 12; and helix angle, 15°. Compacted powders were consolidated by sintering and solution heat treatment. The consolidated billets consisted of lamellar and fine-grained microstructures. Extrusion experiments were carried out under the following conditions： temperature, 250 ℃; strain rates, 2.36× 10-3 s^-1 and 1.18× 10^-1 s-1. The mechanical properties of the extruded helical gears were investigated by measurement of the Vickers hardness and extrusion load, and by scanning electron microscopy.基于Zn-22%Al共析合金的超塑性,采用粉末挤压工艺制造微型螺旋齿轮,以减小成形压力和获得细小的显微组织。该螺旋齿轮的规格为:模数0.3,齿数1.2,螺旋角15°。将粉末压制坯通过烧结和固溶热处理进行致密化。致密化的坯料由层状和细晶状组织组成。在温度250°C,应变速率2.36×10-3和1.18×10-1s-1的条件下对坯料进行挤压,并对挤压成形的螺旋齿轮的力学性能进行测试。

关 键 词：helical gear powder extrusion gas atomized Zn-22%A1 powder SUPERPLASTICITY 

分 类 号：TF124.34[冶金工程—粉末冶金]