A Method for Isothermal Die Forging Process Trajectory Planning Oriented to the Target Grain Structure of Forgings

Abstract

The invention provides an isothermal die forging technology track planning method for forge piece target grain structures. The method comprises the following steps that 1, forging stock initial information, preset target grain structures, preplanned technological track information and isothermal die forging equipment parameters are input, and isothermal die forging is started; 2, work condition information of the current sub-process is sensed online, the current grain structure and the grain structure obtained from execution of the current isothermal die forging technology track to the end of isothermal die forging are predicted; 3, the deviation between the preset target grain structure and the predicted grain structure obtained when isothermal die forging is ended is calculated, and an isothermal die forging technological track of the follow-up sub-process is planned and executed; 4, the steps 2 and 3 are executed repeatedly till isothermal die forging is ended. The method can effectively ensure consistency and stability of forge piece quality, and the novel technology is provided for isothermal die forging of high-quality parts.

Description

Technical field: [0001] The invention relates to a method for planning an isothermal die forging process trajectory facing the target grain structure of forgings, and belongs to the technical field of isothermal die forging. Background technique: [0002] The isothermal die forging forming technology has many advantages such as reducing the deformation resistance and frictional resistance of the forging billet, improving the fluidity and formability of the forging billet, and is widely used in the manufacturing and forming of large and complex parts. However, during isothermal die forging, the grain structure and comprehensive properties of forgings are significantly affected by the forming process trajectory of isothermal die forging. Inhomogeneous structures such as coarse grains and mixed grains in actual production can easily reduce the overall performance of forgings. How to ensure the stability and consistency of the forging grain structure in the isothermal die forgi...

AI Technical Summary

Problems solved by technology

However, the pre-planned isothermal die forging process trajectory is often unable to achieve precise control of the forming process and microstructure of high-performance forgings

This is because: on the one hand, the isothermal die forging equipment has the characteristics of large inertia, hysteresis, strong nonlinearity, and uncertainty, which lead to a certain deviation between the actual isothermal die forging process trajectory and the pre-planned isothermal die forging process trajectory. As a result, the actual grain structure of the forging inevitably deviates from the preset target grain structure, so the quality of the forging cannot be guaranteed; on the other hand, in the isothermal die forging process, the nonlinear rheological properties and internal Microstructure, resulting in the inability to precisely control the grain structure of forgings

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