Metal laser selective melting forming double-piston controllable preheating powder cylinder

Abstract

The invention discloses a metal laser selective melting forming double-piston controllable preheating powder cylinder capable of respectively working in two states of single piston and double pistons. When the powder cylinder works in the state of single piston, firstly, a large piston basal plate in a forming cylinder is leveled; and then, the periphery of a cylinder body is heated by using a cylinder body heating ring, and a piston heating plate is used for heating a piston cover plate to realize indirect heating of a forming cylinder and metal powder in a powder feeding cylinder. When the powder cylinder works in the state of double pistons, firstly, a small piston basal plate is leveled; and then, powder in a small piston forming cylinder and a small piston powder feeding cylinder is uniformly heated by using the cylinder body heating ring and the piston heating plate. The powder cylinder adopts an integrated double-piston design; a small piston can be replaced and disassembled to realize the laser forming of metal components with different sizes; powder is saved; and meanwhile, the powder cylinder can be heated in all directions, so that the controllable powder preheating is realized, the powder heating is uniform, the temperature gradient is improved, and the deformation and the split of the components are reduced.

Description

Technical field: [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a dual-piston controllable preheating powder cylinder for metal laser selective melting and forming. Background technique: [0002] Additive manufacturing technology (also known as "3D printing") is a high-end digital rapid manufacturing technology that has developed rapidly in recent years. It is suitable for the near-net shape of complex components. The formed parts manufactured by additive manufacturing technology have excellent mechanical properties. , suitable for rapid prototyping of various materials, and the material utilization rate is high. Selective Laser Melting (SLM) technology is a typical representative of additive manufacturing. It transforms the traditional three-dimensional manufacturing process into a planar manufacturing-cumulative superposition process, and realizes the manufacture of three-dimensional complex precision parts throu...

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Problems solved by technology

[0005] Invention patent "Preheating Device and Preheating Method for Powder Feeding Cylinder of Selective Laser Melting SLM Equipment", application number "201310024599.8", proposes a direction to preheat powder cylinder by using metal induction coil, but the induced current generated by this method The distribution on the formed part is uneven, strong on the surface, but weak inside, affecting the forming quality

[0006] In addition, the size of the powder cylinder of the existing laser selective melting forming equipment is fixed, and the waste is serious when manufacturing small-sized components. Therefore, designing a size-replaceable powder cylinder plays an important role in improving the powder utilization rate when forming components of different sizes.

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