Dynamic laser emission control method of powder spreading type 3D printing equipment and device thereof

Abstract

The invention is applied to the technical field of 3D printing and provides a dynamic laser emission control method of powder spreading type 3D printing equipment and a device thereof. The method comprises the following steps: calculating a laser emission safety point of each powder spreading layer, and allowing a laser device to carry out laser emission operation before a powder spreading shaft moves to a final position. According to the method, through a mode of enabling the powder spreading time of the laser emission safety point to be coincided with printing time, the waiting time is shortened on the promise of ensuring that the powder spreading shaft and laser emitting and printing actions are not interfered with each other and ensuring the production safety; the printing efficiency of the equipment is improved; meanwhile, the triggering condition of laser emission is accurately determined by using a time mode and a position mode.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a method and device for dynamically controlling light emission of a powder-spreading 3D printing device. Background technique [0002] The basic principle of powder-spreading 3D printing equipment is metal powder laser sintering. The metal powder generally has a particle size of 20-40um. The metal is heated by a laser to melt the powdered metal and combine it after cooling. The computer controls the deflection angle of the laser to scan. After processing a layer, the platform will move down a little distance, which is the height of the layer, and then spread a layer of metal powder, and so on. [0003] At present, there are two main ways to control the light output of powder-spreading 3D printing equipment: [0004] In the traditional way, for any layer of powder spreading operation, the powder spreading axis executes the powder spreading movement. When it detect...

AI Technical Summary

Problems solved by technology

This motion mode is a standard light control method, which can fully guarantee the safety of the equipment, but because each layer of printing is not exactly the same, the device will waste waiting time, resulting in lower printing processing efficiency and ultimately higher production costs

[0005] Touch threshold mode, for the printing device, set a uniform threshold in place of the powder spreading axis in advance, and control the laser when it detects that the powder spreading axis moves to the in-position threshold during each powder spreading movement of the powder spreading axis Light output, the 3D printing device controls the laser to emit light, and then starts printing the current layer; although the touch threshold method saves some waiting time, when the touch threshold is small, the efficiency of the device is not improved enough, and the touch threshold is set to be large , it may cause a dangerous situation of interference between the powder coating axis and the laser

[0006] Therefore, it is necessary to provide a technical solution to solve the problems of time waste, low processing efficiency and low safety factor of the powder-spreading 3D printing equipment in the prior art

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