Talking about the solutions for the cutting of titanium coils and titanium tubes
The main factors that affect the processing of titanium coils and weak rigid structures of titanium tubes are: machine rigidity, tool selection, process parameters, cooling and so on. In the process of processing, various factors act and interact with each other.
The accumulation of deformation errors makes the processed weak rigid structural parts very poor, and the processing deformation is difficult to control.
1. Selection of machine tools
The rigidity of the machine tool-fixture-tool system should be good, the gap between the various parts of the machine tool should be adjusted well, and the radial runout of the spindle should be small. Try to use this machine tool.
2. Selection of tools
The increase in cutting productivity is mainly the result of the development and application of new tool materials. In the past few decades, cutting tools have been greatly developed, including cemented carbide coatings, ceramics, cubic nitrogen
Boron, polycrystalline diamond. These are effective for processing cast iron, steel and superalloys. However, no tool can improve the machinability of titanium coils and titanium tubes. This is because the cutting tool materials require very important properties. These include: 1) Good thermal hardness to resist high stress; 2) Good Thermal conductivity to reduce thermal gradient and thermal shock; 3) Good chemical inertness
To reduce the tendency of chemical reactions with titanium; 4) Good toughness and fatigue resistance to adapt to the chip segmentation process.
The main problem in the milling process of the titanium coil and the weak rigid structure of the titanium tube is the milling deformation of the thin wall. Because the modulus of elasticity of titanium alloy is low, and the cutting force is relatively large, the thin wall is
During the milling process, it is easy to produce a knife shape under the action of the milling force. As a result, the actual thickness of the thin wall after processing is greater than the theoretical thickness. The solution to this problem should be to reduce as much as possible the force that the thin wall receives from the direction perpendicular to the machined surface during the milling process, which causes the thin wall to deform the tool.
3. Cutting fluid
Titanium coils and titanium tubes have high strength, oxidation resistance, and high temperature resistance. While meeting the high performance requirements, they also bring many problems to the cutting process. Products in cutting
At this time, in order to reduce the cutting temperature, a large cooling-based cutting fluid should be poured into the cutting area to take away the heat of the cutting edge and flush away the chips to reduce the cutting force. Therefore, the requirements for the cutting fluid are large thermal conductivity, large heat capacity, fast flow rate, and large flow rate. The method of good cooling is the high-pressure cooling method, and the cutting fluid flow rate is not less than 15 ~ 20L/min. -There are three types of cutting fluids generally used, namely water or alkaline solutions, water-based soluble oily solutions and non-water soluble oily solutions.
