Fixture special for gearbox shell machining

Abstract

The invention relates to the field of workpiece clamping devices, and discloses a fixture special for gearbox shell machining. The fixture comprises a numerical control rotary table, an oil pressure tailstock and a bridge plate which is provided with positioning columns; the positioning columns are fixed to the bridge plate and are hollow; a screw is fixed to each positioning column and is in threaded connection with a lock nut; four slide grooves are distributed in the middles of the positioning columns correspondingly; a slide block is slidably connected into each slide groove; a deflector rod is arranged in each positioning column, and a first connection ball is fixed to the middle of the deflector rod; a compression spring is connected between each slide block and the corresponding deflector rod, an amplification rod is hinged to the end, away from the slide block, of the deflector rod and is longer than the deflector rod, a second connection ball is fixed to the amplification rod,and the corresponding first connection ball and the second connection ball are both in spherical hinge with the inner wall of the corresponding positioning column; and a U-shaped tunnel is formed inthe bridge plate, one end of the U-shaped tunnel communicates with the positioning columns, the other end of the U-shaped tunnel penetrates through the bridge plate, and reflecting mirrors are installed at corners of the U-shaped tunnel. The invention aims to provide the special fixture capable of ensuring the clamping precision of a gearbox shell.

Description

technical field [0001] The invention relates to the field of workpiece clamping devices. Background technique [0002] The gearbox casing is usually formed by die-casting, and the formed gearbox casing also needs to process planes, grooves, holes, etc. on the casing. Since the gearbox housing often needs to process inclined surfaces, inclined holes, etc., a four-axis turntable is often used to clamp the workpiece. In the process of clamping, the accuracy of clamping position directly affects the accuracy of machining. [0003] The Chinese invention patent with the application number CN201620925377.2 discloses a four-axis tooling for CNC machining of automobile steering gear housing. The tooling includes a base, and the two ends of the base are respectively equipped with a CNC turntable and a hydraulic tailstock. They are respectively fixed on the bottom plate by bolts. Both the CNC turntable and the hydraulic tailstock are equipped with turntables on the inside. The toolin...

AI Technical Summary

Problems solved by technology

In this patent, the locking bolt is inserted into the mounting hole on the shell to fix the workpiece, but the mounting hole is usually larger than the locking bolt, and it is difficult to ensure that the locking bolt is coaxial with the mounting hole when the locking bolt locks the workpiece. In turn, there is a position error after each clamping of the workpiece, which reduces the clamping accuracy, thereby reducing the machining accuracy

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