Gear shaving is a gear finishing operation of high efficiency and high precision. After shaved by shaving cutter of true involute profile, there are the "mid-concave" phenomena around the pitch points of the...Gear shaving is a gear finishing operation of high efficiency and high precision. After shaved by shaving cutter of true involute profile, there are the "mid-concave" phenomena around the pitch points of the work gear tooth flanks inevitably. This problem severely affects the shaving accuracy and gear transmission quality, which hasn’t been resolved thoroughly for a long time. Aiming at the problem, based on shaving mechanism and the analysis on gear tooth profile mid-concave, a new-style shaving cutter with unequal depth gashes is designed and manufactured. As compared with common shaving cutter, its depth of gashes is zero on the pitch points of tooth profiles and gradually gets deeper to max. from pitch points to the tops of teeth or the roots. Because of no depth on the pitch points, there are no cutting edges, that is, no cutting action, so the work gear isn’t cutted around its pitch points and is only pressed during shaving operation. Therefore, the gear tooth errors are decreased greatly. And the experimentations have proved the shaved gear has better surface finish that achieves the expectant effect. In addition, this paper analyses the forming of gash on the basis of slotting principle, and proposes a design method of gash: gash bottom is formed by two involutes which intersect on the pitch point and are concentric with the base circle of involute profile of cutter. Furthermore, the equations of the two involutes are deduced and the solution is introduced. This paper analyses the forming of gash on the basis of slotting principle, and proposes a gash-designing method. And the experiment has proved that the shaved gear has better surface finish that achieves the anticipated effect.展开更多
为更好地发挥梳棉机的锡林针布在不同工艺条件下对纤维的梳理作用,提高梳理效果和生条质量,采用两种齿深的锡林针布,在两种梳棉机产量条件下进行对比试验,将盖板花进行收集,采用Primier a Qura测试仪进行检测。试验结果显示,锡林齿深对...为更好地发挥梳棉机的锡林针布在不同工艺条件下对纤维的梳理作用,提高梳理效果和生条质量,采用两种齿深的锡林针布,在两种梳棉机产量条件下进行对比试验,将盖板花进行收集,采用Primier a Qura测试仪进行检测。试验结果显示,锡林齿深对盖板花质量是有影响的。浅齿比深齿更加有利于棉结的去除,尤其是纤维棉结的去除,对带籽屑棉结的去除浅齿和深齿相差不大;对于盖板花中棉结的平均尺寸而言,纤维棉结、带籽屑棉结和棉结总数的平均尺寸表现出相同的规律,均以0.3 mm齿深的锡林针布条件下的盖板花质量为好,排除的棉结尺寸较大。展开更多
文摘Gear shaving is a gear finishing operation of high efficiency and high precision. After shaved by shaving cutter of true involute profile, there are the "mid-concave" phenomena around the pitch points of the work gear tooth flanks inevitably. This problem severely affects the shaving accuracy and gear transmission quality, which hasn’t been resolved thoroughly for a long time. Aiming at the problem, based on shaving mechanism and the analysis on gear tooth profile mid-concave, a new-style shaving cutter with unequal depth gashes is designed and manufactured. As compared with common shaving cutter, its depth of gashes is zero on the pitch points of tooth profiles and gradually gets deeper to max. from pitch points to the tops of teeth or the roots. Because of no depth on the pitch points, there are no cutting edges, that is, no cutting action, so the work gear isn’t cutted around its pitch points and is only pressed during shaving operation. Therefore, the gear tooth errors are decreased greatly. And the experimentations have proved the shaved gear has better surface finish that achieves the expectant effect. In addition, this paper analyses the forming of gash on the basis of slotting principle, and proposes a design method of gash: gash bottom is formed by two involutes which intersect on the pitch point and are concentric with the base circle of involute profile of cutter. Furthermore, the equations of the two involutes are deduced and the solution is introduced. This paper analyses the forming of gash on the basis of slotting principle, and proposes a gash-designing method. And the experiment has proved that the shaved gear has better surface finish that achieves the anticipated effect.
文摘为更好地发挥梳棉机的锡林针布在不同工艺条件下对纤维的梳理作用,提高梳理效果和生条质量,采用两种齿深的锡林针布,在两种梳棉机产量条件下进行对比试验,将盖板花进行收集,采用Primier a Qura测试仪进行检测。试验结果显示,锡林齿深对盖板花质量是有影响的。浅齿比深齿更加有利于棉结的去除,尤其是纤维棉结的去除,对带籽屑棉结的去除浅齿和深齿相差不大;对于盖板花中棉结的平均尺寸而言,纤维棉结、带籽屑棉结和棉结总数的平均尺寸表现出相同的规律,均以0.3 mm齿深的锡林针布条件下的盖板花质量为好,排除的棉结尺寸较大。
