Gear cutting and finish machining technology are analysed
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source:MOMEYER CNC Machining
As in last few years the development of gear cutting technology, cutting tool of gear material, gear is made and machine tool of the improvement of the craft of roll flute emery wheel, gear reached treatment efficiency respect to have in the precision of finish machining gear very big rise, of speed fast imagine beyond. And the develops direction to involve maturity not only Euramerican market that gear makes, still include to be rapid development market of the representing with China. Hob of traditional high-speed steel and wet cut a technology to you still can go much further? Hard alloy hob and do those who cut treatment to drive action be obvious to all. Big to gear automation line batch is produced, high-speed steel hob whether be taken to replace by hard alloy hob? Dry cut the only way that whether already made gear hobbing treatment, be still the route that can you still go wet cut? Although hard alloy hob is special apply to boil cut a car to use gear. But, the applied rate that hard alloy hob is in Europe is not high still, because reach the development of technology of coating of high-powered cutting tool as new-style high-speed steel material,this is, hard alloy hob and high-speed steel hob are in the difference on gear hobbing time but controlled in 15% the left and right sides; Price of hard alloy hob is higher, if gear work measure is insufficient quite much, the cost of hob of use hard alloy will be very high; Moreover, special caution wants when hob of use hard alloy, and rolling cut parameter and program of corresponding gear hobbing should weave very meticulously, hob of use hard alloy of ability of contemporary gear-hobbing machine is only correct gear hobbing, and if want to replace gear hobbing facility, need huge investment. With respect to Samputensili character, produce 25000 hob every year about, among them hard alloy kind occupy only 3% the left and right sides. This that is to say, the yield with hard alloy annual hob is 750 at most. Gear doing cuts treatment is additional one and the same. The cost that because environmental protection asks to reach,handles cooling waste liquid is very high, when the user of Europe, United States and Japan is choosing, general meeting takes an examination of Lv doing to cut gear hobbing; And the developing country waits in China, India, although control pollution also is a pressing requirement, but need time. After once the society is right the control that pollutes a problem is increasingly strict, gear doing cuts treatment to also will develop quickly. Which kind of gear finish machining are more popular to gear finish machining, between shave tine and roll flute, are which kind of gear finish machining more popular? This wants to distinguish a kind of industry and another kind of industry above all come. Say for example, the gear great majority that auto industry uses still relies on shave tine to undertake machining. Some enterprises also can undertake to gear of back end gearing grinding is machined, this is to eliminate what happen on annular and columnar gear merely any is out of shape. The gear cutting time that afore-mentioned mentioning decreases, of quality of the gear before the development that basically is attributed to machine tool of new-style gear cutting tool, contemporary gear and the finish machining surplus that bring from this decrease considerably and be being ground rise. Additional, compare with photograph of roll flute machine, gear shaving machine of contemporary numerical control often is valence half result times, the grade of high accuracy gear before can winning heat treatment (be as high as DIN5-6 grade) ; And compare with photograph of grinding of gear whorl grinder, treatment cycle is shorter also. To the gear of auto industry, especially the pinion that those in automatic transmission using, we can machine shave tine what postheat processing causes to be out of shape control is in a few micron; Additional, the correction that passes tooth form and teeth directional conduces to compensation be out of shape. Because contemporary razor blade is ground of machine appear, be like the S400GS that Samputensili company place produces, two parameter can repair tooth form, teeth directional simply quickly form; When batch is produced, the benefit that shave ages treatment compares grinding is much a lot of, be compared and character, shave tine can assure character already, the price reasonable. Samputensili is one of companies of be among the best of candidates of industry of tine turbine tool, the razor that in recent years its make has not shown the sign of slow increase production. Meanwhile, amount of production of gear grinding machine tool also is rising ceaselessly. The flying development of gear cutting craft, the operation of place of gear machine tool is efficient and fast, gear is ground annulus also had rapid development. This basically is behaved grind in pottery and porcelain, CBN emery wheel, eletroplate grind annulus wait for a respect. Use afore-mentioned grinding to provide will undertake gear grinding is machined, make treatment cycle shortens. Narrowing stage by stage as a result of treatment cycle, the cost that gear grinding machines also is reduced considerably subsequently. What need points out is, some estates are very expensive to the requirement of gear quality, some industries need to implement special tooth form, must be finished so through grinding. For example, project of heavy truck industry, aviation and use at generating electricity, change reducer industry of report, rely on grinding to do gear precision work. In these high-power industries, gear grinding already was in very preponderance. The character demand of the new technology gear wheel that gear batch produces is higher and higher, gearshift noise demand is lower and lower. Want to achieve the double goal of character, noise, this undertakes the gear cutting with taller precision with respect to the requirement, implement very complex gear teeth directional and tooth form, the error that the purpose is a gearshift drive falls the smallest. This is meant, henceforth inside a period, grinding remains the main means that gear produces group by group, gear grinding machines craft this to may apply more extensively. But want special attention the unit cost of gear cutting. Up to now, the profit that the shave tine with low, big yield results brings cost is apparent. Grinding achieves complete success in gear finish machining when, shave ages ability is replaced may large-scaly by it. Anyhow, no matter choose which kind of gear cutting methods, want to notice to use a case actually more. In view of gear hobbing treatment obtained quite great progress at present, the high accuracy that obtains after very possible gear hobbing also needs to undertake shave ages no longer. The further progress of gear agglomeration technology is made to gear also make larger contribution, but this method is in budding condition at present, very difficult accurate forecast future to develop a tendency. Place says above no less than, although change of development of gear cutting technology is very big, but the unit finished cost of gear won't be changed for certain. On product line of big batch water, gear cutting structural adjustment should is with this parameter oriented. The development of new technology to quality, precision rise to have profit greatly. Refine as the essence of gear product technology, the requirement of crucial to these two essential factor is stricter and stricter. Although satisfy so high demand very difficult, we also must want to seek high level. But, high index of smooth with a view to is insufficient still, what we should pay close attention to more is to reach good in quality and cheap in price level, otherwise again good gear new technology, new function also won't get the welcome of the market, gear state of technology also won't be improved then. On the industry with technical high content, should coexist at the same time the trend with craft nicety and reasonable price. CNC Milling