Metal spinning machine

Abstract

A metal spinning machine includes a mandrel kept in rotation, a roller tool with which a plate blank workpiece is pressed against the mandrel to form the workpiece, linear motors that generate thrust force in proportion to driving electrical current and drive the roller tool, an operating lever that gives an operator command to the linear motor and a control unit that includes a memory. Manual operation of the roller tool with the operating lever by an operator receiving a teaching of the operator command forms the workpiece in a prescribed shape. The memory of the control unit stores the operator command that is then given to the linear motor to enable a same shape to be subsequently formed relative to plate blank workpieces repeatedly.

1 . A metal spinning machine comprising:
 a mandrel kept in rotation;   a roller tool with which a plate blank workpiece is pressed against the mandrel to form the workpiece;   linear motors that generate thrust force in proportion to driving electrical current and drive the roller tool;   an operating lever that gives an operator command to the linear motor; and   a control unit that includes a memory;   wherein manual operation of the roller tool with the operating lever by an operator receiving a teaching of the operator command forms the workpiece in a prescribed shape, and the memory of the control unit stores the operator command that is then given to the linear motor to enable a same shape to be subsequently formed relative to plate blank workpieces repeatedly.   
   
   
       2 . A metal spinning machine according to  claim 1 , wherein the operator command indicates a target position of the roller tool obtained by integrating a speed input to the linear motor in proportion to an angle of the operating lever, and the driving electrical current of the linear motor is decided based on feedback of a difference between a current position and the target position of the roller tool. 
   
   
       3 . A metal spinning machine according to  claim 2 , wherein for each movement of the target position of the roller tool over more than a fixed distance during the teaching of the operator command, the target position and a time of that instant are stored in the memory and a correspondence between the target position and a time of passage is variable at a time of playback.