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Abstract 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 1035 thin-walled shell part forging die set. First of all, the DEFORM software was used to simulate the Impact Extrusion, Reduced Gauge, as well as Ironing process and 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 Process Annealing, when performing the Impact Extrusion by crank press forging machine with shrinkage rate77.4%, the maximum load was252 tons. Process Annealing was used to avoid work hardening proble in this experiment before the first step of forming. When performing the first step of Ironing forming was performed by oil press machine with ironing rate 60%, the maximum load was 17tons. When performing the second step of Ironing forming with ironing rate 66.7%, the iii maximum load was 13tons. .And when performing the third step of ironing forming with ironing rate 75%, the maximum load was12tons. To avoiding work hardening, the last step of the experiment the Process Annealing was used. For effective heat treatment, the Ironing forming was performed by oil press machine with ironing rate 60%. The maximum load was 20tons. The target vehicles were forged successfully by the developed die set and the flow lines of the forgings were reasonable.
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