The wear of gear hob is a very complex proposition, and there may be different answers. It not only depends on the feed and speed, raw materials and gear hob parameters, coolant, etc., but also on the direction of tool channeling and the equipment conditions of the machine. The purpose is to briefly introduce the common types of wear.
Generally speaking, wear is caused by cutting edge machining operations with continuous use of tools. There are different types and severity of wear. We will introduce five types below (only applicable to involute high-speed steel hobs)
1) Tooth side edge wear – during the use of the tool, the tooth side edge is continuously darkened and gradually connected into a certain width area by the edge;
2) Tooth side chipping – gear hobbing hobs usually form chipping edges near sharp corners on the tooth side;
3) Wear of gear hobbing hob tip – the tooth tip of gear hobbing hob is the place where wear often occurs;
4) Tooth tip wear – wear or edge collapse at the tooth tip of gear hobbing hob;
5) Sharp corner of the tooth tip is broken – the sharp corner of the tooth tip is worn, rapidly worn and even broken. Most involute hobs have chamfering or circular arc at the sharp corner of the tooth tip for modification;