Economical manufacturing of high accuracy gears and their performance

1.对精密齿轮的经济型制造进行了总结，研制了能精确加工出高精度、高硬度齿轮的精滚刀，并用飞刀和滚刀两种检测方法对滚齿的精度、齿面粗糙度和滚刀寿命进行了研究。结果表明：(L)研制的新型金属陶瓷材料适用于改善齿轮的表面粗糙度和耐磨性。(2)研究了齿面宽度、滚刀磨损和齿面粗糙度之间的关系。这块地是刀刃上残留的滚刀螺纹的一部分。由于土地的存在，滚刀可以精确地制造出来。(3)关于…的调查结果金属陶瓷刀具更多地应用于高硬度齿轮材料，可在40m/min左右的低切削速度下实现精加工。用金属陶瓷精滚刀对中等硬度齿轮进行滚切试验表明：(1)齿形精度提高，齿面划痕少，表面粗糙度最高可达1-3微米左右。(2)对于平台宽度为0.1-0.2 mm的金属陶瓷精滚刀，模数6齿轮的精度保持在JIS 0级。(3)滚刀磨损对齿面粗糙度和齿轮精度几乎没有影响，仅限于地面允许的0.25 mm左右的齿面磨损宽度。2.齿轮齿面耐久性综述；利用动力循环式齿轮试验机对金属陶瓷精滚刀加工的齿轮表面耐久性进行了研究。(1)金属陶瓷精滚齿的表面粗糙度最高可达2-3微米，约为高速钢滚刀的1/5。(2)在传递载荷作用下，金属陶瓷精滚齿的承载能力比高速钢滚刀提高约4倍。较少

This research aims at economical manufacturing of gears with accurate tooth profile, which have medium and high hardness, and also describes the surface durability of those gears.1.Summary for the economical manufacturing of accurate gears; The development of the finishing hob made with new material which can finish the tooth profile accurately and smoothly is carried out; and the accuracy and tooth surface roughness of hobbed gears and the hob life are investigated by two kinds of examinations using the fly-tool and the hob.The fundamental tests using the fly-tool shows as follows;(l)The new cermet material is developed, that is suitable for improvement of the surface roughness and has good wear resistance. (2)The relationship among the land width, the hob wear and the tooth surface roughness is investigated. The land is a part of the cutting edge remained on the hob thread. Hobs can be manufactured accurately owing to existence of the land. (3)As a result of the investigation about a … More pplication of the cermet tool to high hardness gear materials, the finish cutting is possible in low cutting speed of about 40 m/min.Hobbing tests of the medium hardness gear with the cermet finishing hob shows as follows; (1)The accuracy of the tooth profile is improved and few scratches on tooth surfaces exist, resulting in good surface roughness of about 1-3 micro-meter in maximum. (2)In the case of the cermet finishing hob with 0.1-0.2 mm land width, the accuracy of the module 6 gear is kept in 0 class of JIS. (3)The hob wear hardly influences the tooth surface roughness and the gear accuracy to the limit of flank wear width of about 0.25 mm included with the land.2.Summary for the tooth surface durability of gears; The surface durability of the gears manufactured with the cermet finishing hob are investigated by using a power circulating-type gear testing machine. (1)The surface roughness of the cermet finish-hobbed gear is 2-3 micro-meter in maximum height, which is about one-fifth that of the gear made with the high speed steel hob. (2)The load carrying capacity of the cermet finish- hobbed gears increases by about four times in transmission load that of the gear hobbed with the high speed steel hob. Less