Hobbing die with automatic locking

Abstract

The invention relates to a hobbing die capable of locking automatically. The hobbing die comprises a die holder and a die body arranged on the die holder. A central spindle is perpendicularly arranged on the die holder. The die body is provided with a hole, and a steel ball is arranged in the hole. The upper end of the central spindle is provided with an ejector head. The central spindle and the ejector head are sleeved with the die body. The central spindle is fixedly connected with the die holder. The upper end of the central spindle is provided with a conical surface matched with the steel ball. A return spring is arranged between the die body and the die holder, and the die body only can move vertically in the axial direction of the central spindle. According to the technical scheme, after a workpiece is placed in the hobbing die, the die body moves downward along with the workpiece, the return spring is compressed at the time till the steel ball a on the die body makes contact with the conical surface at the upper end of the central spindle, and the conical surface of the central spindle extrudes the steel ball to force the workpiece to stop moving downward; after a machine tool tailstock ejector pin applies supporting force downward, the acting force in the direction of the conical surface of the central spindle is applied to the steel ball so that the workpiece and the hobbing die can be completely fixed to realize automatic locking, and therefore labor intensity is lowered for workers.

Description

technical field [0001] The invention relates to a gear hobbing die, in particular to an automatic locking gear hobbing die. Background technique [0002] The hobbing die is a tool used to realize the connection between the workpiece and the worktable. The workpiece is placed vertically, the lower end is positioned and fixed by the hobbing die, and the upper end is positioned by the thimble of the tailstock of the machine tool. Processing of splines. The hobbing die is mainly composed of die base, die body, screw handle, mandrel, end cover, anti-rotation screw, plug and steel ball. When the hobbing die is fastened to the workpiece, it is necessary to manually rotate the screw handle through the handle. The screw handle pulls the mandrel to move downward, and the mandrel drives the plug to move downward. The steel ball squeezes the inner wall of the workpiece until the workpiece is locked with the hobbing die; the loosening process is opposite to the locking method, and the ...

AI Technical Summary

Problems solved by technology

When the hobbing die is fastened to the workpiece, it is necessary to manually rotate the screw handle through the handle. The screw handle pulls the mandrel to move downward, and the mandrel drives the plug to move downward. The steel ball squeezes the inner wall of the workpiece until the workpiece is locked with the hobbing die; the loosening process is opposite to the locking method, and the manual rotation of the screw handle is labor-intensive during use, and once the screw handle cannot be completely locked, the workpiece and the workbench will not be able to Synchronous rotation, affecting product quality

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