Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 15    No. 2    April 2005

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Computer aided design of free-machinability prehardened mold steel for plastic
HE Yan-lin(何燕霖)1, LI Lin(李 麟)1, GAO Wen(高 雯)2
WANG Qing-liang(王庆亮)2, WU Xiao-chun(吴晓春)1

1.School of Materials Science and Engineering , Shanghai University, 
Shanghai 200072, China; 
2. Shanghai No.5 Steel Co Ltd, Shanghai Baoshan Steel Group Co, 
Shanghai 200940, China

Abstract: In order to improve the machinability but not to impair other properties of the prehardened mold steel for plastic, the composition was designed by application of Thermo-Calc software package to regulate the type of non-metallic inclusion formed in the steel. The regulated non-metallic inclusion type was also observed by SEM and EDX. Then the machinability assessment of the steel with designed composition under different conditions was studied by the measurement of tool wear amount and cutting force. The results show that the composition of free cutting elements adding to mold steel for plastic can be optimized to obtain proper type of non-metallic inclusion in the aid of Thermo-Calc, compared with the large volume fraction of soft inclusion which is needed for promoting ductile fracture at low cutting speeds, the proper type of inclusion at high cutting speeds is glassy oxide inclusion. All those can be obtained in the present work.

 

Key words: prehardened mold steel for plastic; machinability; Thermo-Calc software package; non-metallic inclusion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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