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Analysis of machining difficulties of titanium alloy parts

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Update time : 2022-12-05 17:46:39

When titanium alloy meets thin-walled parts, the recognized difficult material to process 2mm thin-wall, it seems that the difficulty is doubled, but after specific analysis, there are still corresponding solutions:

Analysis of titanium alloy thin-walled parts

Part size analysis

The overall appearance is a large circular curved surface thin-wall cavity structure, the wall thickness of the circular surface cavity is 2mm, and the thickness of the connecting shoulder at both ends is 6mm. In order to ensure the sealing of the cover plate and the box body after installation, the flatness of the mounting surface of the cover plate parts is required to be 0.1mm.

Analysis of processing technology

The key machining part of the cover plate is the cavity. The difficulty is to solve the flutter problem of the cover plate in the machining process due to the structural characteristics of the thin wall. Its overall structure is simple, the installation surface of the cover plate and the box body has higher flatness and surface quality requirements, the rest of the dimensional accuracy and surface quality requirements are not high, all processing procedures can be choose to complete on the CNC machining center.

Here, blank sheet material is choose. The processing of titanium alloy thin-wall cavity cover plate parts requires three processing steps: (1) convex cavity rough milling and finishing milling, that is, the installation hole processing; (2) rough finishing milling of concave cavity; Finish the installation surface.

Design of processing technology and tooling scheme

Rough milling and finishing milling of convex cavity and machining of mounting holes

Make sure that the surface castaneling degree of all machined surfaces is Ra3.2Um, leave a machining allowance of 0.5mm in the thickness direction, and machined four M16 deep 40 threaded holes on the large flat surface as the fixed holes for the convex cavity machining process. The positioning size of the four threaded holes is corresponding to the fixed holes of Al-Mg alloy tooling fixed on the work table based on the symmetric center point of the large flat surface. Positioning and clamping are realized by screw clamping method.

Secondly, the convex cavity of the cover plate parts and the step surface installed on both sides are processed. Four-edge end milling cutter with higher cobalt content was choose for the rough machining of convex cavity and the rough finishing of the mounted step surface on both sides. The rough machining method of parallel milling surface was choose as shown in Figure 2. In the process of cutting, high speed tool steel tool must keep enough cutting fluid to extend the service life of the tool.

Then, polycrystalline cubic boron nitride ball end milling cutter was choose for convex cavity finishing, and streamline surface finishing method was choose, as shown in Figure 3. The overall error was controlled within 0.012mm. Finally, the 16 mounting holes on the mounting surface are processed (all belong to threaded connection holes). Direct drilling with 0.5mm carbide drill bit can meet the processing requirements. After the end of this process, the burr should be removed, the sharp edge blunted, the surface of the convex cavity polished, can not have obvious knife marks, so as not to affect the positioning and clamping of the next process.

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