Manufacturing process of metal parts capable of performing shape follow-up annealing heat treatment

Abstract

The invention discloses a manufacturing process of metal parts which can carry out conformal annealing heat treatment. The process includes the steps: firstly, according to the concrete structure of the part to be formed, the preliminary design of a supporting and temperature control area is carried out, a CAD model for manufacturing parts rapidly is established, layering and scan path planning are carried out to the CAD model, and protective atmosphere or vacuum preparation is carried out to a forming box to enter a forming process; in the forming process, a substrate, each layer of metal powder and the part are all heated and kept at the preset conformal heat treatment temperature, annealing and distressing are carried out while the part is formed, and the part is naturally cooled after forming. The manufacturing process can reduce the energy and time needed by sintering a forming area selected by the scanning of high-energy beams, achieve the aims of reducing deformation and reducing stress, and improve the precision and quality of part forming.

Description

technical field [0001] The invention relates to the technical field of rapid manufacturing of metal parts, in particular to a metal part manufacturing process capable of conformal annealing heat treatment. Background technique [0002] In recent years, the rapid manufacturing (RM) technology of parts has been developed rapidly by using high-energy-density heat sources such as lasers, electron beams, and plasma beams to melt or sinter metal and ceramic powders, and to realize parts by layer-by-layer accumulation. This technology provides a fast, flexible and personalized solution for the manufacture of high-performance complex components such as aerospace and automotive, mold manufacturing, and medical implants. [0003] According to different methods of powder feeding and cladding accumulation, rapid manufacturing (RM) technology can be divided into two categories: coaxial powder feeding plus numerical control positioning cladding accumulation and automatic powder spreading ...

AI Technical Summary

Problems solved by technology

These RM technologies are applied in the rapid prototyping process of parts. Due to the rapid movement of the heat source, the heating, melting, solidification and cooling speed are fast, the parts are heated unbalanced, the temperature gradient is high, the structure and thermal stress are large, and it is easy to cause large deformation and cracking of the parts.

Compared with the coaxial powder feeding plus numerical control positioning cladding and accumulation process, the automatic powder spreading plus area selection cladding powder bed process, the melting, solidification and cooling speed of the forming process are eased, and the temperature gradient of the part, the structure and the thermal stress are improved to a certain extent, but Problems of deformation and cracking of parts are still serious, limiting the widespread application of rapid manufacturing (RM) technology

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