Modeling the Process of Disintegration of Solid Materials by Asymmetric Loading in Crushing Machines in Order to Find Ways to Reduce Energy Costs

Abstract

Subject of study. the processes of cracking and destruction of rocks under the action of the working bodies of machines for disintegration. Methodology. A complex method of generalizing the laws of the theory of elasticity and plasticity was used; theoretical and experimental confirmation of the regularities of the distribution of contact normal and tangential stresses, equations of the limiting state of materials based on the Coulomb strength criterion; slip line theory; comparison of theoretical results with experimental diagrams "normal stresslongitudinal deformation" of samples; facts and phenomena of destruction of rocks; generalization of the theoretical regularities arising from the power contact of the tool with the rock in crushers. Purpose. Reducing energy consumption and increasing the efficiency of rock disintegration by controlling its stress-strain state in crushers on the basis of mathematical modeling and using the established regularities of stresses and deformations in rocks when interacting with a working tool. Output. In the contact area, with an increase in the tangential load, the zone of uniform compression of the material decreases, the depth of the most stressed point approaches the contact surface. There is a significant zone of shear deformations, which are the decisive factor in crack initiation. The development of the crack in depth and complete destruction occurs along the shear lines. Such conditions of rock loading are observed in jaw crushers with complex jaw movement, in cone crushers, in roller crushers with different roll rotation speeds and correspond to the model of the most effective sliding compression. The creation of asymmetric loading conditions using the forces of contact friction, frictional and strength characteristics of the destroyed material can reduce the energy consumption of disintegration.

Research of processes of producing materials by technical power loading systems

“…When compiling the equations of motion of the vibration system of a jaw crusher, let's use Hamilton's variational principle. It establishes that the variation in kinetic and potential energy plus variation in the work of non-conservative forces during any time interval should be equal to zero [9][10][11].…”

Determiantion of energy characteristics of material destruction in the crushing chamber of the vibration crusher

“…In the source [3], the author argues that the growth of the crack and the destruction of the material occur along the shear lines, that is, the forces of contact friction play a key role in the destruction. However, using these dependencies to optimize the crushing process is difficult because they include the geometric characteristics of the fracture.…”

Determination of Cutting Transition Parameters in the APQP Pre-production Process of the Engine Camshaft Bearing Housing

“…Следует отметить, что современными требованиями в области качества ведущих автомобильных предприятий является принятие решений на основе фактов [13]. Появляются новые информационные требования к корпоративным системам и информативности документации для управления качеством [14,15]. Основная доступная информация о динамике изменения показателей точности может быть получена из контрольных карт, однако они не содержат ин-формации о зависимости управляемых значений показателей точности и параметров основного процесса.…”