Lathe pneumatic clamping device

Abstract

The invention discloses a lathe pneumatic ejecting device. The lathe pneumatic ejecting device comprises a tail base and a tip; a cylinder capable of displaying the pressure is arranged at the left end of the tail base; the cylinder is connected with a pneumatic valve; a sleeve is embedded in the tail base; a sealing ring is arranged on the right end surface of the inner wall of the sleeve; the tip is arranged at the tail end of an output shaft of the cylinder; the tip is integrally molded with the output shaft; the output shaft can extend and move in the sleeve; a spiral groove for removing chips and exhausting is formed in the inner wall of the sleeve; the spiral groove gradually extends and expands from the right end of the sleeve to the left end, and finally, penetrates out of the left end side walls of the sleeve and the tail base; multiple laps of grooves are formed in the surface of the output shaft; the notch edge of each lap of groove and the outer circular surface of the output shaft, and the groove wall and the groove bottom are both smoothly transited; and the groove bottom is an arc bottom surface inwards recessed. The device can adjust the ejecting force of the top to workpieces, improves the coaxiality of the tip and a lathe main shaft, and enables the workpiece stress to become more uniform and stable.

Description

technical field [0001] The invention belongs to the technical field of lathes, in particular to a jacking mechanism on the back seat of a lathe. Background technique [0002] Lathe is a kind of processing equipment commonly used in the field of mechanical processing. Usually, the head of the lathe is provided with a chuck, the end of the bed is provided with a tailstock, and the tailstock is provided with a top. The threaded connection between the seats or the direct use of the screw as the top, the end of the screw is provided with a hand wheel, the workpiece is generally placed between the chuck and the top during processing, and one end of the workpiece is clamped by a chuck coaxial with the lathe spindle Tighten it, then manually shake the handwheel to feed the screw, and push the top to the other end of the workpiece for turning. Due to the different shapes, sizes and materials of the workpieces, the required jacking force is also different. Manually turning the handwh...

AI Technical Summary

Problems solved by technology

Due to the different shapes, sizes and materials of the workpieces, the required jacking force is also different. Manually turning the handwheel to adjust the feed rate of the tip cannot grasp the jacking force, and the parts are easily deformed, or the jacking force is not enough. As a result, the top end of the workpiece shakes during the cutting process, resulting in unstable clamping, which increases the machining error of the workpiece, especially in rotary parts, such as common shaft parts.

On the other hand, because the tip is exposed under the processing process, it is easy to be contaminated with iron dust and impurities. When the existing tip is fed by a screw drive, it is easy to bring iron dust into the threaded hole in the base, causing sticking or thread The bar is offset, so that the tip and the chuck axis are not on the same straight line, the workpiece is unstable, and the machining error is out of tolerance

The error control of the current machined parts mostly seeks reasons from the quality of the tool, the clamping of the chuck or the cutting process to improve the machining accuracy. In addition to the impact on the top, it is easy to be ignored, and the lack of a suitable top is also the reason. one

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