A positioning fixture and clamping method for titanium alloy ring castings

Abstract

The invention provides a positioning clamp used for a titanium alloy ring-shaped casting and a clamping method. The positioning clamp mainly comprises a rotating worktable, two floating V-shaped blockassemblies, three pin assemblies and one three-claw chuck. The titanium alloy ring-shaped casting is positioned through a clamp and is clamped to the surface of the rotating worktable. Three positioning pins are matched with the end face of the titanium alloy ring-shaped casting so as to limit the linear freedom degree of the titanium alloy ring-shaped casting in the height direction and two rotation freedom degrees. V-shaped blocks are matched with an elliptical structure on the titanium alloy ring-shaped casting to limit the circumferential rotation freedom degree of the titanium alloy ring-shaped casting. The three-claw chuck is matched with a circular inner hole of the titanium alloy ring-shaped casting to limit the linear freedom degree of the titanium alloy ring-shaped casting on the plane, and clamping is achieved. By means of the clamp, complete positioning of the titanium alloy ring-shaped casting is achieved, the clamp is suitable for front-face and back-face clamping of thetitanium alloy ring-shaped casting, and a servo motor arranged in a rotating worktable can be controlled to make the rotating worktable drive the clamp and the titanium alloy ring-shaped casting to rotate to the designated angle after clamping is completed.

Description

technical field [0001] The invention relates to a positioning fixture, in particular to a positioning fixture and a clamping method for titanium alloy annular castings. Background technique [0002] With the arrival of Made in China 2025, the application of industrial robots is becoming more and more extensive. In the aircraft manufacturing industry, many parts are made of titanium alloy, and their blanks are mostly produced by casting. After the titanium alloy is cast, an oxide layer will form on its surface, and there will be small cracks on the surface of its rounded corners, which is not conducive to subsequent processing and the use of finished products. Therefore, after the casting is completed, the surface of the titanium alloy needs to be processed. In the past, the workers manually polished the titanium alloy ring castings and put them on the workbench to grind them with hand tools. However, titanium alloys are difficult-to-machine materials, and manual grinding i...

AI Technical Summary

Problems solved by technology

1. The surface positions of titanium alloy ring castings that need to be polished are widely distributed, and the use of fixtures for one-time clamping will inevitably make some parts unable to be polished.

2. The radial size of titanium alloy ring castings is large, about 920mm, and the processing tools require a large processing range, so the size of the processing equipment will also be too large

3. Titanium alloy is hard, long-term contact is easy to damage the fixture

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