Evaluation of the deformity of the blanket in the process of combined extrusion of a knife for a branch cutter
Abstract
Sivak R., Naliazhnyi V., Chuchin O., Kosarev V.
Evaluation of the deformity of the blanket in the process of combined extrusion of a knife for a branch cutter
It is suggested to use a two-stage combined extrusion process to obtain a blank for the branch chopper knife. Knives are one of the main working elements of the branch shredder, which work under the conditions of impact and repeatedly changing loads, intensive wear, etc. Therefore, at present, the knife production process includes a number of technological machining operations. These include a number of metal cutting operations and heat treatment. In addition, the production of knives requires alloy steel of high value. The article proposes a radical change in the approach to obtaining blanks for chopper knives. For this, it is proposed to use an innovative method of combined extrusion, which includes the process of equal-channel extrusion and precipitation. This will reduce the number of operations related to cutting and replace expensive alloy steel with cheaper grades of structural steel without deteriorating the performance characteristics of the product. To assess the deformability of the workpiece, a tensor model of damage accumulation was used, in which the dependence of plasticity on the stress state scheme was determined by the surface of limit deformations, and the load history by trajectories in the space of three dimensionless indicators. The deformed state was determined using a fixed spatial and particle-related material system of a deformable body. The stress state was determined using the anisotropically strengthened body model.
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