Melting path design method for high energy beam selective melting forming

Abstract

The invention discloses a melting path design method for high energy beam selective melting forming. The method comprises the following steps: 1, acquisition of layered section images of a to-be-machined workpiece: layered section images of multiple layers of the to-be-machined workpiece are acquired and stored, wherein the section of each layer is a to-be-machined area; 2, contour extraction: the contour of each layer of section image is extracted; 3, melting path filling: melting path filling is performed on the multiple to-be-machined areas respectively, melting path filling for any to-be-machined area comprises the following steps: surface layer scanning path filling, inner core scanning area determining and inner core scanning path filling. The method has simple steps and is reasonable in design, convenient to implement and good in use effect; a melting path for high energy beam selective melting forming can be designed simply, conveniently and rapidly, the designed melting path is reasonable, the workpiece machining precision is high, all parts of the workpiece are uniformly heated, and the workpiece has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of high-energy beam processing, and in particular relates to a melting path design method for high-energy beam selective melting forming. Background technique [0002] High-energy beam selective melting technology is an advanced additive manufacturing technology. Firstly, the target part model is designed by computer, and then the model is layered by software to obtain the cross-section information of the part. After superposition layer by layer, the high-energy beam is controlled layer by layer according to the cross-section information The metal powder is melted and piled up in such a way that the target part is finally made. High-energy beam selective melting technology can quickly and directly obtain metal parts of any complex shape without making molds. It is an effective way to solve the manufacturing of complex technical parts, shorten the production cycle, increase productivity and reduce production ...

AI Technical Summary

Problems solved by technology

Nowadays, the high-energy beams used for additive manufacturing mainly include electron beams and laser beams. Due to the limitation of energy density and material characteristics, the layered manufacturing process of high-energy beam selective melting and forming is to complete the melting and forming of materials through one-time scanning. , can only be heated point by point or block, material powder or wire can only be melted point by point or partition

At present, the point-by-point or block-by-block scanning melting method adopted by the high-energy beam selective melting technology, the heating of different parts of the part is inconsistent, which is likely to cause uneven heating of the material, and thermal stress is likely to be generated during the melting and solidification process; and, after the processing is completed, if the part The large residual stress in the interior will inevitably have a negative impact on its accuracy and mechanical properties. When the forming thermal stress is severe, it will lead to internal defects and warping of the part

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