Rearward pull clamping type lathe fixture for processing of inner hole and end faces of thin-walled part

Abstract

The invention discloses a rearward pull clamping type lathe fixture for processing of an inner hole and end faces of a thin-walled part. The rearward pull clamping type lathe fixture comprises a tubular base; one end face, which is tapered, of the tubular base is as tapered as the outside of one end of an elastic collet; the tubular base which is a disc base is fixed while the elastic collet is slidable; the inside of the elastic collet clamps the outside of a workpiece, and a gap remains between the inside of the elastic collet and the outside of the workpiece so as to favor clamping of the workpiece. When a cylinder drives a pull rod to pull the elastic collet to slide rearward, the elastic collet contracts to clamp the workpiece; while the elastic collet moves rearward and gradually clamps the workpiece, the workpiece is driven to move rearward to tightly attach to a positioning seat. A positioning sleeve is arranged among the positioning seat of the fixture, the elastic collet and the pull rod so that coaxiality of the positioning seat, the elastic collet and the pull rod is guaranteed. The rearward pull clamping type lathe fixture has the advantages that deformation of the thin-walled part can be effectively reduced, clamping is facilitated, positioning is reliable, and batch production of parts is facilitated.

Description

technical field [0001] The invention belongs to the field of lathe fixtures, in particular to a back-tightening type lathe fixture for processing the inner hole and end face of a thin-walled part. [0002] Background technique [0003] In the gear sleeve processing process, for the special structure of some parts, the process needs to process the inner spline hole of the gear sleeve. The end face angle requirements are high, and the end face of the gear sleeve is required. In the above situation, the usual clamping method is to use a three-jaw chuck to clamp the outer circle of the part, and one end of the workpiece is close to the positioning surface. Using a three-jaw chuck is simple and efficient, but there are several problems. First of all, gear sleeves are usually thin-walled parts, and the three jaws can only clamp the workpiece at three places in one circle. When the three claws are loosened, the inner hole is easy to become a triangle, and the clamping force dri...

AI Technical Summary

Problems solved by technology

First of all, gear sleeves are usually thin-walled parts, and the three jaws can only clamp the workpiece at three places in one circle. When the three claws are loosened, the inner hole is easy to become a triangle, and the clamping force driven by the hydraulic pressure is too large, which makes the parts deform more seriously, affects the subsequent process processing, and is not conducive to product quality control; second, the three claws Clamping and unclamping are slow, which is not conducive to mass production; third, when the clamping part is against the positioning surface, it is necessary to hold the workpiece close to the positioning surface and wait for the three-jaw clamping before it can be removed. During this process, the workpiece is easy to It is moved outward by the clamping force of the three jaws, so it cannot be close to the positioning surface, and it is easily affected by human factors. It cannot ensure that the positioning of the parts is close to the three-jaw chuck, and the reliability is not good; fourth, it is inconvenient to adjust the machine tool. Re-turn the claws, after several times of claws, the claws become thinner and scrapped prematurely

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