Abercrombie Outlet Point- stress analysis of the impact of cutting tool

Point-stress analysis of the impact of cutting tool Road is a Sino-Russian border river channel, require the use of mechanical rock breaking, can not destroy the surrounding vegetation, and can not be polluted river water; the project must be completed shortly. To this end, research group developed a highly efficient, reliable and dredging equipment. The device uses the milling rock breaking way that the impact of the tool used to install some type of milling drum for rock cutting, milling device shown in Figure 4. By comparison, companies choose Germany KENNAMETAL Construction Mechanization 2007 (09) 29 Special hair open study the impact point in Figure 4 and the milling cutter device C7/U47 impact point of a l010742 head type, alloy head diameter 19ram, blade angle of 75 . . The tool used for digging medium more rigid rocks,Abercrombie and, head diameter d embedded in small, embedded length of the large, small knife, with strong invasive capacity, long life. Knife design for easy installation and replacement, to facilitate construction. First, the mechanical properties of the rock bed to test, get the elastic modulus,Abercrombie, hardness and other parameters invasive, point-impact and determine the mechanical properties of the tool head. Then, in the ANSYS model of the cutter, and the division of finite element mesh,goedkope Abercrombie New features of the socialist, alloy head with mapping grid, the first processing module using ANSYS geometry modeling. Because the tool is rotating body, so by using scanning method at the grid alloy head, get an accurate hexahedral mesh. In order to improve accuracy,Abercrombie Outlet, the use of ANSYS in the second unit of the tool solid95 discrete unit, constraints the tool and tool holder of the contact surface nodes of the mobile freedom, then the external load function with ANSYS APDL language secondary development will be calculated the nodal forces applied one by one pick, the calculated results shown in Figure 5. Figure 5 shows VonMises equivalent stress, can be seen that the tool surface contact stress distribution of contact stress is less than the maximum allowable stress, consistent with strength requirements. According to the tool table in Figure 5 the results of the finite element model and analysis of 302007 (09) CONSTRUCTIONMECHANIZATION contact stress and rock mechanical properties of look-up table calculated by the tool wear rate of 0.5 / h, the tool wear rate is an important design parameter because it directly affects the effectiveness of rock breaking device,Abercrombie Outlet, so the correct calculation of the tool surface contact stress is of great significance. Milling-type channel dredging equipment in the winter of 2003, construction machinery plant in Harbin successful trial, conducted experiments and terrestrial channel field experiment. The results show that the impact of the tool point can be achieved 8m / h rock breaking speed, tool wear is 0.6 / m, to meet the design requirements. Milling plant in the summer of 2006 officially put into use, complete rock milling capacity l5000m. 4 Conclusion-point impact of the tool is an efficient tool for breaking rocks, knives blade surface stress distribution of tool wear is the main factor, so its precise stress analysis is of great significance. In this paper, the complexity of the blade surface pressure stress calculation method can get more accurate results of stress analysis, and the method is simple, convenient and can be widely applied in rock cutting equipment design calculations. Through practical projects to illustrate the application of stress analysis, but also proves the correctness and feasibility of the method. Po [ ,],[