Technological conditions of abrasive tool operation

Abstract

. An abrasive instrument with every day finds all greater application at implementation of operations from finish abrasive treatment of details of machines, cleaning of metallic and non-metal surfaces from paints and varnishes coverages, blight and contaminations. Polymeric-abrasive brushes in most cases apply in combination with the hand angular grinding machines of small power.The basic task of work are determinations of power charges and their distribution with the aim of minimization of heating of polymeric matrix and increase of part of energy, that is spent on the output of material that is subject to moving away.At determination of power charges the next indexes of power were taken into account, namely: power, that is passed from abrasive grain that gap-filling fiber, at a contact with the processed surface; power of destruction of surface that is processed; power of thermal losses of energy is at the friction of fiber at the surface of material that is processed. Taking into account the enumerated indexes of power the condition of balance of energy is made. It allowed to define an output-input of abrasive instrument ratio and set, what factors result in his increase. And also, to get dependence, that describes the general overfall of temperatures on that the fiber of brush is heated for all the time of her work.For determination of probability of faultless work of machines with polymeric-abrasive brushes a flow diagram that includes two criteria was made: probability of destruction of fiber from a tiredness and probability of destruction of fiber from the pin loading. The made chart was examined with authenticity of faultless work of instrument on each of these criteria. The decision of the system of probability of faultless work of brush is dependence, that allows to define tenure of employment of brush. Thus, possibility to expect the number of polymeric-abrasive brushes for providing of trouble-free implementation of works appears on a site or assembling area.An increase to the output-input ratio is provided by next indexes, namely, diminishing of specific heat capacity, mass of fiber and overfall of temperatures of fiber for one turn of brush. And also increase of amount of abrasive, border of durability and crossing of fiber and length of arc of contact.Determination of probability of faultless work of hand and portable machines with polymeric-abrasive brushes the resource of their work allows to determine.