Structural Design and Welding Test of Friction Stir Welding Spindle Head
A spindle head of friction stir welding machine is studied in order to solve the problem of engineering application.The friction stir welding head has three rotating axes:B-axis,C-axis and S-axis.The B-axis was a manually controlled shaft for adjusting the tilt angle of friction stir welding process.The C-axis was driven by gear.It rotates around the machine Z-axis to follow the tangent of stir tool.The function of S-axis was to drive the tool to stir welding by mechanical spindle.The driving method of the mechanical spindle is direct-connection.The support method is two column bearings and two ball bearings.The interface of the mechanical spindle can constraint the conical surface and end surface.The static and modal simulation of the mechanical spindle are simulated.The stiffness of the spindle met the requirements,and the maximum working speed is much lower than the first-order natural frequency.It can effectively avoid resonance.The process test is completed by using the designed friction stir welding head.When the welding speed is 300 mm/min and the tool speed is 1000 r/min,the welded joint is well.The tensile strength of the joint is 259 MPa that is about the 82.5%performance of the base metal.The results show that the design of spindle head for friction stir welding is reasonable,and it provides reference for the design of the similar machine.
friction stir weldingspindle headmechanical spindlewelding test
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