Friction stir welding spindle force control considering heat transfer conditions
In order to solve the problem of spindle force fluctuation and welding quality instability caused by the change of specimen structure and weld position in friction stir welding process,we studied the heat-force relationship under the change of weld position and specimen structure and proposed the spindle force control scheme considering the change of heat transfer condition.Deform-3D software was used to simulate the temperature field of friction stir welding.We compared and analyzed the actual welding temperature and spindle force measured by the test,and obtained the variation trend of spindle force near the edge of the specimen.Based on the Hammerstein structure,we established a friction stir welding spindle force model considering heat transfer conditions and a generalized predictive control spindle force controller.The controller is implemented in Siemens 840Dsl numerical control system.We carried out the engineering test on the welding equipment and the test results show that the proposed control scheme has good control effect.Under different heat transfer conditions,the actual spindle force can be controlled within 5%of the expected main shaft force.
friction stir weldingmain shaft force controlgeneralized predictive controlprincipal shaft force modelheat transfer condition
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