Визначення геометричних параметрів різців головки при нарізанні точних арочних зубчастих коліс

Abstract

Розроблена методика визначення геометричних параметрів різцевої головки при нарізанні точних циліндричних арочних зубчастих коліс на верстатах з числовим програмним керуванням. Отримані залежності для розрахунку та аналізу передніх та задніх кутів інструменту в процесі нарізання та вздовж його різальних кромок. Запропоновано конструктивне забезпечення доцільних кутів на різальних кромках.

The use of precise cylindrical arched gears in machine mechanisms will increase their performance due to increased load capacity, wear resistance, noise reduction, vibration, increased durability. Cutting of such arched wheels can be carried out by with face cutters heads on machines with numeri-cal control. With additional shaping movements, for cutting precise involute gear wheels, the geometry of the cutting element in the cutting process will differ from the original tool set in the drawing. Depending on the parameters of the gear and the cutter head value kinematic angles may acquire unsatisfactory value and adversely affect the gear cutting process. Therefore, the study and determination of the geometry of the tool blade during the cutting process is a topical problem that needs to be solved. To solve this problem, a technique was developed to analytically determine the front and rear angles of a tool shaped blade. Depending obtained can determine kinematic angles along the cutting blades and at different positions of the tool and the workpiece. Studies have shown that when cutting arched wheels with bilateral cutters that simultaneously cut the convex and concave sides of the tooth cavity, it is quite difficult and sometimes impossible to obtain satisfactory kinematic rear corners at the tip of the tool. Therefore, a scheme was proposed for separate cutting of the convex and concave sides of the tooth cavity, which makes it possible to apply angular occlusion, in which it is possible to obtain the necessary kinematic rear corners on the lateral and apical cutting edges of the tool.