Study On Optimization Of Die’s Uniform Wear Based On Preform/Shape Design

Die life is one of the important factors influencing production quality, efficiency and cost. Die contact with the workpiece in the die failure of die wear, die failure caused by wear is difficult to control. In the metal plastic forming process, the shape of the die directly limit the flow of metal, which directly affect the wear of the die surface. So the optimal preform/die shape design becomes the crucial aspect of controlling the quality of the product.Based on the above analysis, this paper in constructing the Archard wear model,and on the basis of using the finite element simulation software on forming process of the die wear study. Die’s uniform wear mathematical optimization model was built aimed at the case that wear depth on die profile surface is too big and service life is too short. In this paper, forging and drawing as an example,senior engineer font forging’s preform and Aluminium rod drawing die compression zone shape design for a linear shape, the arc-type and four curved. Uniform wear as the objective function, respectively, to the design of linear perspective, arc radius and four curve inflection point position for the design variables. The sample test data obtained by the finite element numerical simulation1stopt software curve fitting, design variables and objective function of a function of, and gives the mathematical expressions. Optimized to the optimal value, the best shape of the die to achieve objectives such as uniformr wear. The results show that three kinds of optimal preform/die surface of the shape design of maximum wear depth compared to optimize die before the maximum wear depth has a greater degree of reduction. Curve comparison of the wear of the mold cavity through the optimization of the shape of the three designs, we can see that the four curved preform/mold surface of the die shape design to wear the smallest wear evenly distributed. This paper constructs the single objective function of the drawing force and uniform wear and the multi-objective function based on the drawing force and uniform wear. A method of Nurbs curve was used to describe die profile, and design variables were Nurbs curve data points coordinates. On the basis of the compression zone of the drawing die shape design, a large number of simulated samples to optimize the design for the drawing die shape based on the drawing force and uniform wear objective function. Research has realized to the rational design of the drawing process, to achieve the purpose of reducing energy consumption and improve the service life of die.