The Fixture Design And CNC Path Planning Of Big Thin-Wall Aluminum Profile

Thin-wall aluminum profile which has the advantages of light weight and low machining allowance has been widely used in modern industry.Some critical profile parts is easy to be deformed influenced by the cutting force during machining due to the low rigidity and bow/twist of thin-wall profile and their dimensions and tolerances are hard to meet.The paper researches in the machining process of a big thin-wall aluminum profile by the way of the theoretical analysis,finite element analysis and actual machining based on a company project.It also researches in hydraulic fixture design and CAM.At first,the paper analyzes the structural characteristics and machining difficulties of the part,confirm the machining process including the machining center and fixture form.Expound the basic principle of fixture design.Then design the location and clamping mechanism of the hydraulic fixture.Choose the specification of the oil cylinder by calculating the maximum cutting force.Verify the fixture design by computer simulation on ANSYS.After these,look into the process of a critical feature:a special cavity of the part.Choose the cutting tool,machining allowance,cutting parameters.Compare with several tool path of a critical machining feature on Mastercam.Verify the machining deformation on ANSYS according to the machining and cutting parameters.At last,do the actual machining on the machining center to verify the hydraulic fixture design and NC program outputted by Mastercam and the result is OK.The research supports the trail-produce and mass-produce of the project,and also has reference value for similar machining.