Machining Distortion Analysis of Aerospace Components Usingthe Contour Method

• During machining the accumulated residual bulk stresses induced by previous shape forming process steps, such as forging, casting or additive manufacturing and subsequent heat treatment will be released. This may cause undesirable geometric distortions of the final component and thereby high rejection rates and costs. This problem can be reduced by adjusting process– and design parameters. This paper presents a methodology for minimizing machining distortions. The methodology is based on a combination of procedures for prediction of machining distortions, using the Contour method and procedures for adjustment of machining distortions. Practical experiences are discussed and demonstrated using an aerospace component. The methodology should be executed in close cooperation between several actors in the value chain and best results may be achieved by combining several concepts for adjustment of machining distortions. Further research in conjunction with the Contour method, adaptive fixturing and toolpath adjustment is recommended.

Nyckelord

Machining distortions

Contour method

Adaptive Fixtures

NC-Code optimization

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