Research And Manufacture Of High-speed Milling And Polishing System For Curve Thin-walled Component Weld Seam

Thin-walled component has the outstanding advantages of light weight, high strength,attractive appearance, with the increasingly wide range of engineering applications.However, considering the processing, thin-walled component has complex structural shape,relatively low stiffness, high shape coordination requirements, poor processingperformance, and it prone to deformation. Since then, it difficult to control the machiningaccuracy of thin-walled component and to achieve high processing efficiency.As welding has the advantages of strong adaptability, high connection strength, goodconnect sealing, it widely used in the forming of large thin-walled structure. It is necessaryof grinding and polishing processing for weld seal to eliminate stress and produce a smoothsurface. However, the workload of handling the weld seal grinding and polishing processingis very large. Domestic weld seal processing technology capabilities are in a very weak state,mainly completed by hand, with the disadvantages of low production efficiency,labor-intensive, serious environmental pollution on the surrounding, difficult to guaranteemachining accuracy, rubbing the surface of the substrate from time to time. Relative to thehigh level of welding forming automation, thin-walled component weld seal processing hasbecome a key factor in restricting the wide application of thin-walled component.This paper proposes a new solution and technology route: high-speed millingtechnology is introduced into the thin-walled weld seal processing, for high-speed millinghas the advantages of small milling force, low milling temperature, tool excitationfrequency far away from the processing system natural frequency, achieving high-speedand efficient processing, greatly improving the processing efficiency and surface quality.A high-speed processing platform is developed, and its mechanical system includesmulti-face fixture positioning system, high-speed spindle unit and feed motion platform.The hardware of the control system is developed based on the motion control card and theopen numerical control system. The spindle speed control system achieves spindle speedcontrol function by adjusting the power supply frequency of the electric spindle. Servo feedsystem receives the servo motor speed as feedback signal, achieving closed-loop control of the motion platform.The development of software system is completed using VC++programming language,achieving the functions of system initializations, condition monitoring of the motion axis,motion axis settings, curves interpolation motion control. Trajectory planning of toolcompensation strategy is finished, and the real-time online tool radius compensationfunction is achieved by programming using the VC++, adapted to the dynamic change oftool radius.Experimental study of thin-walled stainless steel weld seal high-speed millingprocessing is finished on the high-speed processing platform, achieving the purpose ofoptimizing the choose of high-speed milling cutter, the theoretical and experimentalanalysis on the causes of vibration in the high-speed milling processing of the thin-walledcomponent, putting forward specific improvement measures, investigating the impact of themilling process parameters on surface roughness experimentally.