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Precision Machining In The Aerospace Industry For The Material Requirements Are Very High
Mar 18, 2017

Titanium alloy, its small proportion, determines the quality of small, high strength and heat intensity, determines the hardness and high temperature, and resistant to seawater and acid corrosion and a series of excellent physical and mechanical properties, determine its no matter what kind of environment Can be used, in addition to a little, the deformation coefficient is very small, so in the aerospace, aviation, shipbuilding, petroleum, chemical and other industries have been widely used. It is because the titanium alloy with the above is not the same as ordinary materials, but also decided that it is very difficult in precision machining, many mechanical processing plants are reluctant to process such materials, do not know how to process this material.

Titanium alloy cutting, the cutting force is not, the work hardening is not serious, easy to get better surface finish, but the titanium thermal conductivity is small, high cutting temperature, tool wear, tool durability is low, the tool should be used with titanium Chemical affinity of small, high thermal conductivity, strength, grain size of small tungsten cobalt carbide cutting tools, such as YG8, YG3 and other tools. In the process of turning, the chip is a difficult problem in processing, especially the processing of pure titanium. In order to achieve the purpose of chip breaking, the cutting part of the blade can be ground into a full-shaped crater, After the wide, so that the chip is easy to discharge out, so that will not let the chip wrapped around the surface of the workpiece, causing the workpiece surface scratches.

Precision machining in the aerospace industry for the material requirements are very high, of course, one side is to meet the specificity of aviation equipment, there is more important because of the impact of space scene. Because of the special environmental impact, so the general material on the market of course can not meet the needs of the environment, is bound to need some special materials to replace. Drilling is also more commonly used, titanium drilling more difficult, often in the process of burning knife and broken drill phenomenon. The main reason is the drill bit grinding bad, chip is not timely, poor cooling and poor system and other reasons caused by poor. Depending on the diameter of the drill bit, grinding narrow blade, the width is generally 0.5 mm, in order to reduce the axial force, reduce the vibration caused by the vibration. At the same time in the distance from the drill tip 5-8 mm, the drill edge with a narrow, leaving about 0.5 mm, is conducive to the drill bit in the chip. The geometry must be sharpened, the two cutting edges must be kept symmetrical, which can prevent the drill only one side of the blade cutting, cutting force all concentrated on one side, so that the drill bit too early wear, or even slip caused by chipping phenomenon. Always keep the blade sharp, when the blade blunt, you should immediately stop drilling, re-sharpening the drill bit. If you continue to use the blunt drill bit forcibly cutting, the drill bit will soon be burned due to high temperature friction, the drill causes the drill to be scrapped. But also the hardening layer of the workpiece thicker, to re-drill after the increase in the number of times and the number of grinding drill bit. According to the drilling depth requirements, should try to shorten the length of the drill bit, increase the thickness of the drill to increase the rigidity, to prevent drilling due to jitter caused by chipping. It has been proved that the length of the drill of φ15 is 150 years longer than that of long 195. So the length of the selection is also very important.

As the titanium alloy deformation coefficient is small, the cutting temperature is high, the tip stress is large, the work hardening serious, resulting in cutting, the tool is easy to wear, chipping, cutting quality is difficult to guarantee. How to do cutting Titanium alloy cutting deformation coefficient is small, the knife and the chip contact area is small, the cutting temperature is high, in order to reduce the cutting heat generation, ① the front angle of the turning tool should not be too large, the carbide angle of the alloy car generally take 5-8 degrees , Due to the high hardness of titanium alloy, in order to increase the impact resistance of the turning tool, the rear corner of the tool should not be too large, generally take 5 °, in order to strengthen the tip part of the strength, improve heat dissipation, improve the impact of the tool Ability to use the absolute value of the larger negative edge angle. Control a reasonable cutting speed, not too fast, and in the processing process using titanium alloy cutting fluid for cooling, can effectively improve the tool durability, and select the feed rate.