Cutting technology for thin-wall titanium alloy part

Abstract

The invention relates to a cutting technology for a thin-wall titanium alloy part. According to the cutting technology for the thin-wall titanium alloy part, tool materials, angles and cutting factors suitable for machining of titanium alloy materials are selected, the machining durability of tools is improved, the deformation effect of workpieces is reduced remarkably, and the machining quality of the workpieces is improved. A machining result of 1000 workpieces in multiple batches shows that the qualified rate of the workpieces is only 70 percent before the technology is improved, and the qualified rate of the workpieces is increased to about 97 percent after the technology is improved.

Description

technical field [0001] The invention relates to a cutting process for thin-walled titanium alloy parts. Background technique [0002] The specific gravity of titanium is 4.54g / cm3, which is only 58% of steel (7.8g / cm3). The specific strength, specific stiffness, corrosion resistance and bonding performance of titanium alloy are good, the high temperature deformation is small, and the fatigue and creep resistance are also good. . According to statistics, among the components of national defense products, structural parts made of titanium alloy materials account for 90% of the total number of components, and the application of titanium alloys in national defense products is increasing. However, when titanium alloy materials are cut, the tool wears quickly, sticking to the tool is easy to occur, and built-up edge is formed on the tip of the tool. The cutting elements affect the processing quality of the workpiece. [0003] The biggest bottleneck in the processing of titanium ...

AI Technical Summary

Problems solved by technology

[0006] (3) The cutting temperature of titanium alloy material is high

The thermal conductivity of titanium alloy materials is lower than that of stainless steel and high-temperature alloys, and the heat dissipation conditions are poor, so that the temperature of the cutting zone rises rapidly. The temperature of the cutting zone is much higher than that of other materials, and the accumulation near the cutting edge is not easy to dissipate, resulting in stress concentration near the tool tip. , tool wear chipping

[0007] (4) The cutting force per unit area of ​​titanium alloy material processing is large

The cutting force per unit area of ​​titanium alloy material processing is large, and the main cutting force is about 20% smaller than that of general structural steel. Due to the short contact length between the tool and the chip, the cutting pressure is concentrated on the small contact area near the cutting edge, so the unit contact The cutting force borne by the area is greatly increased, resulting in an increase in the friction coefficient at the contact point between the knife and chips, and accelerating the wear of the rake face of the tool

[0008] (5) Titanium alloy material processing is easy to produce surface pollution layer

Due to the high chemical activity of titanium, it is easy to produce chemical reactions with various gas impurities, such as: O, N, H, C and other elements are immersed in titanium alloys to form interstitial solid solutions, which seriously bend the surface lattice and reduce plasticity. , C, forming hard layers such as TiN and TiC with high hardness, resulting in chipping, chipping, peeling, etc.

[0009] (6) Vibration and deformation caused by cutting titanium alloy thin-walled workpieces

These principles help to solve the problem, but there is still no literature to check the specific tool material, angle, cutting amount, and chip discharge method during processing.