Additive manufacturing method and additive manufacturing equipment

Abstract

The invention discloses an additive manufacturing method and additive manufacturing equipment. The method comprises the steps that a powder laying device is used for laying metal powder on a bottom plate or a selectively solidified layer to form a metal powder layer, wherein the thickness of the metal powder layer is 80-150 microns; a laser device generates laser, and the laser selectively sinter the current layer section according to the slicing information of the to-be-printed piece under the control of a scanning system; after metal powder of the current layer section is sintered and solidified, an ultrasonic peening device conducts linear ultrasonic peening on the solidified section in the direction opposite to the laying and conveying direction of the metal powder of the current layer; and a forming cylinder descends by one layer thickness, and the step 1 is executed again. Compared with the prior art, the layer thickness is increased by 2-3 times, and the printing efficiency is greatly improved; and by conducting linear ultrasonic peening on the solidified section, local compression deformation is introduced into the workpiece, so that holes and micro cracks in the workpiece can be closed, micro buckling deformation of the workpiece is eliminated, and the quality of the printed workpiece is improved.

Description

technical field [0001] The present application relates to the technical field of additive manufacturing, in particular to an additive manufacturing method and additive manufacturing equipment. Background technique [0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. tooling mold, so the application range is very wide. Selective Laser Melting (SLM) is one of the rapidly developing additive manufacturing technologies in recent years. It uses metal powder materials as raw materials, and uses laser to scan the cross-section of a three-dimensional entity layer by layer to complete prototype manufacturing. The complexity of the shape is limited, no tooling and molds are required, and the application range is wide. The basic process of the selective laser melting process is: the powder fe...

AI Technical Summary

Problems solved by technology

[0003] In order to ensure the molding quality, the layer thickness of each layer needs to be strictly controlled. At present, the layer thickness of the general metal powder is 30-60μm, because the layer thickness is too thick, it is easy to crack, and the internal stress is too large, resulting in poor molding quality. If it is serious, the part to be printed will be scrapped; if the layer thickness is too thin, more layers are required to complete the molding of a part to be printed, and each layer requires the operation of the powder spreading mechanism and the sintering of the scanning system , not only greatly increases the cost, but also greatly reduces the molding efficiency

Images