End face drive ejector pin

Abstract

The invention discloses an end face drive ejector pin. The ejector pin comprises a drive ejector pin seat, an ejector pin body, a drive floating device and an ejector pin positioning seat, an ejector pin body containing cavity is formed in the drive ejector pin seat, the ejector pin positioning seat is arranged at the front end of the drive ejector pin seat, and a knife handle connecting disc is arranged at the rear end of the drive ejector pin seat. The ejector pin body, the drive floating device, a spring and a first jackscrew are sequentially arranged in the ejector pin body containing cavity from front to back, the center of the ejector pin body is arranged outside the ejector pin positioning seat, and a gasket is arranged between the ejector pin body and the spring. The center of the ejector pin can stretch out and draw back, and a drive blade can float, so that the problem that the end face of a workpiece is machined unevenly is solved, end drive stress of all points is uniform, the center does not have lateral force, and the centering precision is improved.

Description

technical field [0001] The invention belongs to the technical field of precision indexing processing applied to gear grinding and the like, and in particular relates to an end face driven thimble. Background technique [0002] Face drive is a kind of workpiece fixture installed on the spindle of the machine tool. It uses the end face drive top and tailstock to clamp and use. The top is driven by the end face installed on the main shaft of the machine tool, responsible for transmitting the torque generated by the rotation of the main shaft to the processed workpiece placed between the two tops, and driving the shaft parts to rotate. The end drive is used for one-time processing or to avoid processing interference. [0003] Ordinary end drives are divided into two categories: one is that the tip is axially telescopic and the driving blade is fixed, and the other is that the top is fixed and the driving blade is retractable. When the driving end surface of the workpiece is no...

AI Technical Summary

Problems solved by technology

When the driving end surface of the workpiece is not perpendicular to the center of the workpiece, only one or two driving points of the two types of end drives contact the workpiece, so there is a lateral force, which makes the positioning worse and causes machining errors

There is a runout of 0.03-0.1 between the end face and the center line. It is impossible to ensure that the four points of the fixed end drive completely contact the end face of the workpiece. If the force is increased to allow the end drive to contact the end face, the two tops will be deformed and the accuracy will be affected.

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