The use of deforming broaching for ­enhancing the efficiency of cutter chisels

Abstract

ThE uSE of DEforMInG BroAChInG for EnhAnCInG ThE EffICIEnCy of CuTTEr ChISElS Purpose. To determine the potential of deforming broaching for the improvement of efficiency of cutter chisels in the mining industry. Methodology. The study of the application of the technological process of deforming broaching was carried out based on the experimental research into conditions of assembly of press couplings corresponding to cutting rockdestroying tools, the working surface of which is reinforced with solidalloy inserts. findings. Based on the conducted research, a new process of assembling the crowns of cutter chisels with the use of deforming broaching was developed. originality. It was determined that the range of angles of inclination of generatrix of the working cone of the deforming element and the rolltreading lip of the insert, which are necessary for efficient machining and pressing in crowns of cutters, is 4-16°. It was proven that the "solid alloysteel" press couplings for cutter chisels will have the maximum bearing capacity at total tension a/d 0 ≤ 3 %. It was found that it is necessary to foresee the following distribution of tensions: to perform 2 % of deformation by preliminary deform ing broaching, and 1 %-by pressing in an insert Practical value. The use of deforming broaching makes it possible to increase the strength of fastening the inserts of cutter chisels by 2 times, to reduce specific consumption of the tool by 4.4 times, and to increase the average drilling rate by 4 times.