Gear milling positioning fixture for spiral bevel gear

Abstract

The invention discloses a gear milling positioning fixture for a spiral bevel gear, which comprises a draw bar coaxially matched with an inner bore of a mandrel, and a chuck coaxially connected with the left end of the mandrel. The outer wall of the left end of the draw bar and the inner bore of the mandrel have a tapered expansion sleeve structure; the inner bore of the draw bar is in clearance fit with the shaft section of a workpiece; the inside of the chuck is provided with stepped holes; the inner bore at the left end is in clearance fit with the shaft neck of the workpiece; the chuck is provided with a through hole which pass through a large-diameter outer wall, because the through hole directly communicates the inside and outside of the chuck, the workpiece cannot form a closed cavity after being arranged, thus, the workpiece is easy to be disassembled and installed. The gear milling positioning fixture is particularly suitable to be matched with the fixture of the mandrel positioning structure.

Description

technical field [0001] The invention relates to a positioning fixture, in particular to a positioning fixture for positioning a milling spiral bevel gear with a hole. Background technique [0002] Due to the special structure of the tooth surface of the spiral bevel gear, the milling process is much more difficult than that of other tooth types, especially the positioning is difficult. For the positioning installation of the spiral bevel gear, the prior art adopts a hole positioning structure, which is simple in structure, accurate in positioning and reliable in connection. Once this kind of open hole is plugged into the shaft section of the spiral bevel gear, a closed cavity will be formed. When the workpiece is disassembled after machining, a negative pressure will be formed due to the axial displacement of the workpiece. It is difficult to remove the workpiece from the chuck positioning structure. The disassembly operation needs to be assisted by tapping to complete the ...

AI Technical Summary

Problems solved by technology

Once this kind of open hole is plugged into the shaft section of the spiral bevel gear, a closed cavity will be formed. When the workpiece is disassembled after machining, a negative pressure will be formed due to the axial displacement of the workpiece. It is difficult to remove the workpiece from the chuck positioning structure. The disassembly operation needs to be assisted by knocking. Although this operation is effective and feasible, it reduces the production efficiency and easily damages the positioning accuracy of the fixture.

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