STUDY OF ALUMINUM TUBE COLD NOSING PROCESS INTO CONICAL AND HEMISPHERICAL DIES

Theoretical analysis and finite element method were used to simulate the cold nosing process of commercial purity Aluminum tubes into conical hemispherical dies. The influences parameters, namely initial tube wall thickness, semi-die angle coefficient friction investigated. results obtained in terms load-displacement curves, thickness distribution deformed parts, ratios strain distributions. According these finding, final shape defects product can also be predicted. Experimental work was carried out verify simulation results. A new developed setup design proposed improve quality. Two adjacent punches used: one with a front plunger other an outer sleeve constrain tube. It could observed that load increase increasing semi die friction. ratio increases as increases. Comparison between analytical FE predictions experimental showed good agreement.