Preformed blank optimization design method during forging of double-performance disc

Abstract

The invention belongs to a shape optimization design method of a forging forming preformed blank in the field of hot working. According to the technical scheme, based on ideal gradual change strain distribution of the double-performance disc final forging, gradient strain distribution of the forging serves as an objective function, and the forging filling rate and the material utilization rate serve as constraint conditions; and a method of combining Latin hypercube test design with a finite element numerical simulation technology is adopted to calculate and obtain sample data for establishinga target function and constraint condition approximate model and establishes a Kriging approximate substitution model, and is combined with a genetic algorithm to perform global optimal search to optimize the shape of a double-performance disc prefabricated blank. The shape optimization design method has the outstanding advantages that the gradient strain distribution of the final forging is usedas a target function; and the limitation that an existing preformed blank shape optimization design method is only suitable for homogeneous component preformed blank shape design is broken through, so that the filling rate and the material utilization rate can be increased, and forge piece dependent variable distribution and active regulation and control of internal microstructures can be achieved.

Description

technical field [0001] The invention belongs to a method for optimizing the shape of a forging preform in the field of thermal processing, and in particular relates to an integrated control method for forging and forming properties of a dual-performance disc. Background technique [0002] The shape of the preform not only affects the size of the forging load and the smoothness of the forming process, but also affects the fluidity, filling, forming shape, dimensional accuracy, and evolution of the microstructure and properties of the metal during forging of the dual-performance disc. This means that the optimal design of the preform is directly related to the forming accuracy and graded microstructure formation of the dual-performance disk. Therefore, in order to realize the active control of shape-property integration in the forging process of dual-performance discs, the shape and size of the preform must be scientifically and rationally designed. [0003] The document "Zha...

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Problems solved by technology

[0004] In order to overcome the deficiency that the existing shape optimization design method cannot realize the shape design of the dual-performance disk preform, the present invention provides a dual-performance disk preform optimization design method based on the target gradient strain distribution during forging. The invention ends with the dual-performance disk The gradient strain distribution of forgings is used as the objective function, and the filling rate and material utilization rate of forgings are constrained, and the method of combining Latin hypercube test design with finite element numerical simulation technology is used to calculate and establish the approximate model of objective function and the approximate model of constraint conditions. Based on the sample data, the Kriging approximate surrogate model is established, and combined with the genetic algorithm, the global optimal search is carried out to optimize the design of the shape of the dual-performance disc preform

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