Selective laser melting rapid forming device

Abstract

The invention discloses an efficient multi-station selective laser melting rapid forming device. The device comprises a control system, laser devices, a light guide system and stations, one or more laser devices are arranged, each laser device corresponds to at least two stations, the control system is used for controlling movement of components in the stations and laser output states of the laser devices, each station comprises a laser forming module, a scanning system and an auxiliary device, the scanning systems and the auxiliary devices correspond to the laser forming modules, the laser forming modules are forming cavities in an SLM device, each scanning system is composed of at least one galvanometric scanning system, and the auxiliary devices are used for achieving preheating or / and gas purifying circulation required by SLM forming. Lasers emitted by the laser devices pass through the light guide system and then reach the scanning systems of the corresponding stations respectively, then, laser melting is performed on powder through the corresponding laser forming modules, the stations alternatively perform powder feeding, powder laying, scanning and lifting, uninterrupted work of the laser devices is achieved, efficient utilization of the lasers is achieved, and the manufacturing cost of the formed part is reduced.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a multi-station high-efficiency selective area laser melting rapid prototyping equipment. Background technique [0002] The basic principle of Selective laser melting (SLM) technology is to make three-dimensional parts based on layer-by-layer manufacturing and layer-by-layer superposition. The process flow is as follows: (1) first slice the 3D CAD model of the part in layers to obtain the contour information of each layer of parts; (2) the control system plans the process and scanning path; (3) the powder feeding device feeds powder, The powder spreading device lays a layer of powder as thick as the slice thickness in the molding cylinder; (4) the laser selectively melts the powder according to the control system instructions; (5) the piston of the molding cylinder descends to a height of layer thickness; (6) repeats ( 3)~(5), until the manufacture of parts is c...

AI Technical Summary

Problems solved by technology

For a single station, the laser must be "idle" when the piston in the molding cylinder is lowered or during the powder feeding / spreading time, resulting in a waste of resources

Especially if a high-power laser is used, after multi-layer and multiple continuous scanning forming, due to the large heat accumulation of the powder bed, it is easy to cause the temperature of the molten pool to be too high, which will reduce the solidification speed of the part

For this reason, it must be cooled for a period of time, so that the molten pool cools down before the next scan, making the "idle" time of the laser longer

Images