Setting is a process controlling cutting properties of the grinding circles, consisting in removing the blunted grains and products of processing from a working surface of a circle. Setting is carried out during grinding or in breaks between processing.

There are two possible reasons, which cause setting of a grinding circle. The first consists in the fact than the geometrical sizes and a microstructure of a working surface change at a grinding circle. It occurs owing to non-uniform removal from a sheaf of the abrasive grains, caused by their non-uniform arrangement, a unequal acuteness and various durability of connection with a sheaf.

The second reason is the grinding circle loses cutting ability owing to blunting cutting edges of abrasive grains and filling of holes of a circle with the smallest particles of a ground material and an abrasive dust therefore the grinding circle ceases to cut effectively. The further work of such a circle demands increase in pressure of a grinding circle on a ground detail that is dangerous not only to a detail, but also for a circle as the latter owing to the increasing sliding friction causing the big heat dissipation, overheats and can collapse even at insignificant cooling. So, for example, such phenomenon is observed at transition from dry grinding to grinding with cooling, whent a jet of cold air influences on a grinding circle during its stop.

Among various ways of abrasive tools editing it is possible to emphasise setting of a grinding circle by a free abrasive. This method consists of the following:

Figure 2 – The scheme of setting of grinding circles by a free abrasive

Detail 2 is brought up to a contact to a grinding circle, which rotates on working speed. The longitudinal axis of a detail is inclined under a corner within the limits of from 20 up to 60° to a vector of speed of a grinding circle in a point of its contact with a detail. The detail makes back and forth motion along generating line of the tool.

Free abrasive is submitted to a zone of contact of the tool and detail. The free abrasive cuts off a material of a detail and a binding material by moving to details and on a surface of contact. Intensity of grinding of a binding material of the tool and a material of detail is defined by the size, particles of free abrasive and size of a clearance space between the tool and detail. In turn the clearance space during setting is formed automatically by a correct purpose of modes and conditions of capture of a free abrasive.

Thus, moving of a detail to the tool with the set speed and a direction is necessary for a compensation of a detail deterioration during setting and for provide demanded clearance space in a zone of contact of the tool and detail.

The problem of my master’s work consists in definition of operating conditions of individual grain of a grinding circle after setting in various modes, an establishment of dependences between modes of setting and stability of grain while grinding various materials.