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目前常用的蜗轮滚刀设计方法,是以工作蜗杆作为设计基础的,它加工出来的蜗轮副理论上是作线接触的。实践表明,由于线接触齿面对加工、装配误差及受载后的变形等十分敏感,实际得到的接触区往往很不理想。为此,常常要用修磨蜗杆或修刮蜗轮等办法来配接触区,以形成局部接触。这种工艺报费时间,对工人的技术要求又高,还无法确实保证蜗轮副传动质量。我们知道,把蜗轮滚刀直径做得比工作蜗杆大,有可能使蜗轮副得到局部接触,这一点在不少资料上都曾谈及,但这些资料主要限于总结实践经验,很少进行深入的理论分析,因而也没有形成一套完整、实用的蜗轮滚刀设计方法。在国外,E.Wildhaber早在1954年就提出过一套设计方法,西德在加工K型蜗轮副时也应用加大直径的滚刀,但是他们或者推导不详细,或者根本没有任何说明。本文在对蜗轮副啮合原理进行分析的基础上,详细论述了加大直径的蜗轮滚刀的设计理论,可以使滚削加工的蜗轮副直接达到局部接触,从根本上改变上述的落后工艺。
The commonly used worm hob design method is based on the work of the worm as a design basis, it is theoretically out of the worm gear line contact. Practice shows that due to the line contact tooth surface processing, assembly error and deformation after loading is very sensitive, the actual contact area is often not ideal. To this end, often use the grinding worm or repair the worm and other ways to match the contact area to form a partial contact. This process fee time, the technical requirements of workers and high, but also can not really ensure the worm gear transmission quality. We know that making worm gear hobs larger than worm gears makes it possible to get partial contact with the worm gear pairs, which have been talked about on a number of sources, but these are mainly limited to summarizing practical experience and rarely Theoretical analysis, and therefore did not form a complete set of practical worm hob design. Abroad, E.Wildhaber put forward a design method as far back as 1954. West Germany also used larger diameter hobs when machining K-type worm gears, but they were either not specified in detail or were not described at all. Based on the analysis of meshing principle of worm gear pair, the design theory of worm gear with larger diameter is discussed in detail. The worm gear pair can reach the local contact directly and fundamentally change the above-mentioned backward technology.