Deep aperture studies a processing technique that attack a tooth

5 times above. When the whorl that if should use a diameter to machine deepness for the tap of 1/4 ″ ,is 3/8 ″ , this kind of circumstance calls deep aperture tap normally. Machine whorl of a deep aperture, mean long contact requires between cutting tool and workpiece. In the meantime, the meeting in machining a process produces more heat in metal cutting and greater cutting power. Because this is in special material (the metal that be like titanium kind spare parts) the abhorrent sex that small deep Kongzhong has tap produces cutting tool damaged and whorl easily. To solve this problem, can adopt two kinds of plan: (The diametical;(2) of the aperture before 1) increases tap uses the tap that designs for deep aperture tap only. 1.

The whorl bottom outlet with the appropriate diameter of the aperture before increasing tap to thread machining it is very important. The whorl bottom outlet with a largish dimension can reduce the heat in metal cutting of the generation in tap process and cutting force effectively. But the osculatory rate that it also can reduce whorl. National level and technical committee set: In deep Kong Zhong, allow to attack a whorl only on hole wall 50% completely tall. This are when the alveolus tap of pair of special material and difficult treatment material especially important. Because although go up as a result of hole wall of whorl height decrease bring about whorl contact rate to drop, but the addition as a result of whorl length, because this still can maintain the link with reliable whorl. The diametical increment of whorl bottom outlet basically depends on the whorl contact of a requirement is led and every inches whorl head is counted. According to afore-mentioned two values, use experience formula calculable a diameter of correct whorl bottom outlet. 2.

Cutting parameter is hard to machine as a result of titanium metal spare parts, because this needs pair of cutting parameter and measure of cutting tool geometry,do mature. Cutting speed is had as a result of titanium alloy big flexibility and be out of shape rate, because this need is collected,have relatively minor cutting rate. When the alveolus that machines titanium alloy spare parts, recommend adoption circumferential cutting rate to be 10 ～ 14 inches / cent. We are not recommended use minorrer rate, what because be met in that way,cause work is cold make sclerosis. Additional, also need to notice cutting tool damaged and bring about heat in metal cutting. Allow bits chamfer? When deep aperture tap, need to reduce tap chamfer number, make the space holding bit of every chamfer increases. Such, when tap retreats a knife, can take away more scrap, because scrap jams,be reduced and create the opportunity of cutting tool damaged. But on the other hand, of chamfer of tap look bits add an ambassador to get core ministry diameter to reduce, accordingly, tap intensity is affected. So this also can affect cutting rate. Additional, helix chamfer tap discharges bits more easily than straight chamfer tap. The horn before the part after horn is mixed before is small can increase cutting blade strength, increase; of cutting tool life thereby and big before horn is helpful for cutting growing the metal that cuts bits. When be being machined to titanium alloy accordingly, need to consider the factor of these two respects integratedly, choose appropriate before horn. Big hind horn can be decreased the penknife is provided and cut the attrition between bits. Because this asks sometimes,the horn after tap is 40 ° . When machining titanium metal, grind on tap piece big hind horn, be helpful for discharging bits. Additional, grind the tap that makes tap and blade back shovel grind to also be helpful for tap completely. When cooling fluid should process special data, must make sure cutting fluid arrives at cutting blade. To improve the flow of cooling fluid, recommend the blade in tap to carry cooling chamfer on the back. If the diameter is enough old saying, can consider to use inside cooling tap. 3.

Manufacturer of some aircraft spare parts needs applied example to undertake deep aperture tap on a spare parts. This hardware data is alloy of 7 class titanium. In treatment, circumferential cutting speed is 13 inches / cent, use cooling fluid at the same time. To assure spare parts precision, handlers should change in time before filar taper thread grinding is blunt. When tap wears away, the sound of the generation in cutting process can produce change. Through hearing these voice, before treatment, handlers can decide the whorl aperture that can machine before tap wears away is counted. This factory is on each tap equipment, distribute stock 2 tap collet, of identical tap. When among them when a tap wears away, can change in time. CNC Milling