A Numerical Simulation Method of Temperature Field in SLM Forming Process

Abstract

The invention discloses a numerical simulation method for the temperature field in the SLM forming process. The method is based on the principle of finite difference, and adopts the cell nesting method to simulate the temperature field, which breaks through the finite element method and other finite difference methods with small simulation size and long calculation time. limit. Compared with the finite volume method, this method only uses small-sized discrete units around the molten pool with a large temperature gradient, and uses large-sized discrete units in areas far away from the molten pool and with small temperature gradients. The method of unit nesting reduces the number of involved The number of discrete elements to compute. Furthermore, by nesting the calculation time steps, the number of calculations between units can be reduced, thereby reducing the calculation amount of the SLM temperature field simulation calculation and maintaining high calculation accuracy. A new solution is provided for the numerical simulation of the temperature field of large-scale samples.

Description

technical field [0001] The invention belongs to the technical field of computer numerical simulation for additive manufacturing, and in particular relates to a numerical simulation method for a temperature field in an SLM forming process. Background technique [0002] The SLM forming process is affected by process parameters, and the formed parts are prone to defects such as curling, spheroidization, thermal deformation, and thermal cracks. The product structure and material requirements of SLM forming are changeable. The existing research mainly determines the process parameters through a large number of repeated experiments, which is not universal. The current high requirements for technical personnel, long preparation time and high manufacturing failure rate make it difficult for SLM technology to be widely used. [0003] Obtaining the temperature field of the SLM forming process through computer numerical simulation, especially the molten pool temperature, has become an...

AI Technical Summary

Problems solved by technology

This defect limits the development and application of numerical simulation of SLM forming process

There is a way to reduce the calculation amount by increasing the size of the discrete unit as a whole, but it also brings the problem of insufficient calculation accuracy. Therefore, it is very necessary to reduce the calculation amount while ensuring the calculation accuracy.

Images