The secret of titanium alloy processing
Titanium is an important structural metal which developed in the 1950s, titanium-based nitrogen, hydrogen, oxygen and other elements formed to the titanium alloy due to a small density, high strength, low coefficient of deformation, resistance Heat and corrosion resistance and a series of excellent physical and chemical properties, in the aerospace, aviation, shipbuilding, petroleum, chemical, automotive, medical equipment and other industrial fields have been widely used. At present, many countries of the world have recognized the importance of titanium alloy materials, have begun to carry out the research and development of titanium materials, and promote the application of titanium. But also because of these advantages of titanium, so that titanium alloy is not easy to process, many processing plants are keeping the titanium at a long distance. How we could efficiently improve the processing of titanium alloy has become a very stick subject.
Cutting tool materials selection on titanium processing
Due to the Titanium alloy material strength, deformation coefficient is small, cutting temperature is high, the tip stress, work hardening phenomenon is serious, which resulted in cutting, the tool is very easy to wear and chipping, cutting quality is difficult to be guaranteed.
For the processing difficulty of titanium alloy material, we design the processing program, we should first select the appropriate cutting tool. Because of this material strength, deformation coefficient is small, so the tool should first have sufficient hardness, strength and wear resistance; and because the material cutting temperature is high, so the thermal conductivity of the tool made a very high demand, and can not exsit the chemical compatibility with titanium. On the whole, the strength, large grain size of tungsten cobalt carbide cutting tools, such as YG8, YG3, etc. is the ideal choice.
Turning attention of titanium alloy
In the case of turning the titanium alloy processing part, it is a must to consider the shape of the turning tool, because the shape is related to whether the cutting tool is easy to discharge cutting chips. Please do not underestimate the cutting crumbs, which is a major problem in the processing of titanium alloy, especially for pure titanium processing. In order to achieve the purpose of efficient chip breakage, the cutting edge of the cutting tool can be ground into a full arc of the chip flute, the groove before the shallow after the deep, narrow width, so that the chip can be easily discharged, so that the chip wrapped around the surface of the processing, causing the processing surface scratches.
Titanium alloy due to small deformation coefficient of cutting, knife and chip contact area is small, will produce a high cutting temperature. In order to reduce the heat, should be appropriate to reduce the front angle of the knife, generally take 5 to 8 degrees. As the hardness of titanium alloy, in order to increase the impact of the impact of the knife, the rear corner of the tool should not be too large, generally take about 5 degrees. In order to strengthen the tip part of the strength, improve the cooling conditions, improve the impact resistance of the tool, the absolute value should be greater negative blade angle.
Besides the cutting speed would be controlled in a reasonable range, not too fast, and select the suitable rate. During the processing, need to use titanium alloy dedicated cutting fluid cooling, which can effectively improve the tool durability.
Titanium alloy Drilling precautions
Drilling is also a common processing technology which used in the processing of titanium alloys. During titanium alloy processing part in the drilling process, it often occurs burning knife and broken drill phenomenon, which is mainly due to drill bit grinding bad, chip is not timely, poor cooling and poor system and other reasons caused by poor. Appropriate sharpening bits can solve these problems to a certain extent.
In order to reduce the axial force, inhibit the vibration caused by drilling resistance, depending on the size of the drill bit diameter narrow blade, the width of the general retention of about 0.5 mm. Also at a distance of 5 to 8 mm from the tip of the drill, the drill edge is sharpened and retained about 0.5 mm, which facilitates chip bit removal. The geometry of the drill bit must be sharpened, the two cutting edges should maintain absolute symmetry, which can prevent drilling, the drill only one side of the blade contact the titanium processing part, so that all the cutting force on the side, leading to drill premature wear, And chipping the phenomenon.
Drill edge to always keep sharp, once the blunt, should immediately stop drilling, and re-sharpening. If you continue to use the blunt drill bit to force the titanium processing part, the drill will soon be due to the high temperature of the friction and burn, annealing caused by the drill scrap. High temperature not only adversely titanium processing , to re-drill after the increase in the difficulty and more grinding drill inconvenience. According to the drilling depth requirements, should try to shorten the length of the drill, increase the thickness of the drill to increase the rigidity, to prevent drilling due to jitter caused by chipping. Practice has proved that to meet the processing needs of the premise, the shorter the length of the drill, the longer the service life.
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