チタン合金のCNC加工はなぜ難しいのか?

チタン合金部品の比強度は金属構造材料の中でも非常に高いです。. 強度は鋼と同等, しかしその重さはただ 57% 鋼鉄の. 加えて, チタン合金は比重が小さいという特徴があります。, 高い熱強度, 優れた熱安定性と耐食性, しかしチタン合金素材は切断が難しい, 振り向く, そしてミル, 処理効率が低い. したがって, チタン合金CNC加工の難しさと効率の低さをどのように克服するかは、常に緊急に解決されるべき問題でした。.

チタン部品の加工特性

チタン合金の加工が難しい理由
チタン合金は熱伝導率が小さい, そのため、チタン合金を加工する際の切削温度は非常に高くなります。. 同じ条件で, TC4加工の切削温度は2倍以上 45# 鋼鉄, 加工時に発生する熱をワークに逃がしにくい;
The specific heat of titanium alloy is small, and the local temperature rises quickly during processing. したがって, the temperature of the tool is very high, the tip of the tool wears sharply, and the service life is reduced.

The low modulus of elasticity of titanium alloy makes the processed surface prone to springback, especially the processing springback of thin-walled parts. It is easy to cause strong friction between the tool surface and the surface of the machined parts, thereby wearing the tool and chipping.

Titanium alloys have strong chemical activity and are easy to interact with oxygen, hydrogen and nitrogen at high temperatures, increasing their strength and decreasing plasticity. The oxygen-rich layer formed during heating and forging makes machining difficult.

チタン製医療部品の加工

Principles of cutting titanium alloy materials
During the machining process, the selected tool material, cutting conditions and cutting time will all affect the efficiency and economy of titanium alloy cutting.
1. Choose reasonable tool materials
In view of the properties, processing methods, and processing technical conditions of titanium alloy materials, reasonable selection of tool materials. The tool material should be more commonly used, lower price, good wear resistance, high thermal hardness, and sufficient toughness.

2. Improve cutting conditions
The rigidity of the machine tool-fixture-tool system is better. The clearance of each part of the machine tool should be adjusted well, and the radial runout of the spindle should be small. The clamping work of the fixture must be firm and rigid enough. Keep the cutting part of the tool as short as possible. In the case of sufficient chip capacity, try to increase the thickness of the cutting edge to increase the strength and rigidity of the tool.

3. Appropriate heat treatment of the processed material
The performance and metallographic structure of titanium alloy materials are changed by heat treatment to achieve the purpose of improving the machinability of materials.

4. Choose a reasonable cutting amount
The cutting speed should be low. Because the cutting speed has a great influence on the temperature of the cutting edge, the higher the cutting speed, the sharp increase in the temperature of the cutting edge. The temperature of the cutting edge directly affects the life of the tool, so choose an appropriate cutting speed.