| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 95 === In this study, the aims were to analyze the cold forging process of Impact Extrusion - Ironing Method and to investigate the design of the mechanism applied in the AISI steel thin-walled hollow shell forging die set. First of all, the DEFORM software was used to simulate the Impact Extrusion and Ironing process to investigate the feasibility for that process. To concern the proper way of cold forging forming and avoid work hardening, the heat treatment, such as Process Annealing were used. The actual forging experiment was performed to test and verity the feasibility for that process.
The results show that after Spheroidizing, centering process was used first. AISI 1017 the maximum load was 54 tons and AISI 1035 the maximum load was 64 tons. When performing the Impact Extrusion by crank press forging machine with shrinkage rate72.3%, AISI 1017 the maximum load was 65 tons and AISI 1035 the maximum load was 71 tons.
Process Annealing was used to avoid work hardening proble in this experiment before the next step of forming. AISI 1017 when performing the first step of Ironing forming was performed by oil press machine with ironing rate 55%, the length of target vehicles was 88mm . When performing the second step of Ironing forming with ironing rate 72%, the length of target vehicles was 123mm. .And when performing the third step of ironing forming with ironing rate 75%, the length of target vehicles was 156mm.
AISI 1035 when performing the first step of Ironing forming was performed by oil press machine with ironing rate 65%, the length of target vehicles was 78mm . When performing the second step of Ironing forming with ironing rate 69%, the length of target vehicles was 110mm. .And when performing the third step of ironing forming with ironing rate 66%, the length of target vehicles was 153mm.
After forming, both of the target vehicles aspect ratio were 9：1. The target vehicles were forged successfully by the developed die set and the flow lines of the forgings were reasonable.
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