An integrated system of electromagnetic induction heating powder supply and powder bed additive manufacturing

Abstract

An integrated system of electromagnetic induction heating powder supply and spreading manufactured by powder bed additive manufacturing, including the first and second powder storage cylinders on both sides of the optical path system, and the powder outlet of the powder storage cylinder is equipped with a solenoid valve to control powder leakage And connected with the central controller, the middle part of the powder spreading frame connected to the lifting forming cylinder is connected with a metal powder spreading plate, the first and second powder storage tanks are opened on both sides of the powder spreading frame, and the inner wall of the powder storage tank is embedded with a temperature sensor It is also connected with the central controller. A solenoid valve for controlling powder leakage is installed under the powder outlet of the powder storage tank and connected to the central controller. A metal coil is wound on the outer wall of the powder storage tank, and the metal coil is connected to the electromagnetic induction heating controller. The magnetic induction heating controller is connected with the central controller. The present invention heats the powder required for laying a single layer by electromagnetic induction. The amount of powder heated each time is small and the heating is rapid. A forming layer is heated to reduce residual stress and reduce warpage and cracking of the formed part.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to an integrated system for electromagnetic induction heating and powder supply and powder bed additive manufacturing. Background technique [0002] Selective Laser Melting (SLM) is one of the most promising technologies in the field of laser rapid prototyping. Based on the principle of layered additive manufacturing, it uses laser beams to melt metal powder layer by layer to form metal parts with complex structures. Compared with other conventional manufacturing technologies, it has irreplaceable advantages and has become a research hotspot. [0003] However, in the process of forming metal parts by SLM equipment, residual stress is generated due to the uneven temperature field caused by the local heat input of laser rapid forming, which in turn leads to warping and cracking of the formed part. generation is of great significance. In recent years, studies have found that pre...

AI Technical Summary

Problems solved by technology

Since the substrate is mostly fixed on the forming platform through connection, most of the SLM equipment currently on the market uses resistance heating or electromagnetic heating to the entire forming platform to achieve the purpose of heating the substrate. Due to the high heating temperature, the resistance type Heating requires high energy consumption to maintain, and the heat is easily lost through the forming cylinder wall. At the same time, complex equipment structures are required to ensure uniform temperature. In the actual processing process, as the number of forming layers increases, the preheating effect becomes more and more effective. Not significant; while using electromagnetic heating will cause temperature inconsistency due to the skin effect, it is difficult to control the preheating temperature in the processing area, which may further aggravate warping and cracking

Therefore, this method still has great limitations in actual forming.

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