3D laser forming device and 3D laser forming method

Abstract

A 3D laser forming device comprises a machining platform, a first laser source, a powder supplying and spreading device, a scanning galvanometer system, a second laser source, a light path switching device and a machining device. According to the device, the powder supplying and spreading device conveys metal powder and spreads the metal powder on the upper surface of the machining platform, the first laser source emits continuous laser beams, the second laser source emits pulse laser beams, the light path switching device is connected with the first laser source and the second laser source and controls the first laser source and the second laser source to emit laser beams alternatively, the scanning galvanometer system focuses the laser beams onto the machining platform, so that the continuous laser beams emitted by the first laser source melt the metal powder on the machining platform, a machining layer of a to-be-formed product is formed after cooling, the pulse laser beams emittedby the second laser source cut the edge of the machining layer, and the machining device performs finish machining on the upper surface of the machining layer when the upper surface of the machining layer belongs to the upper surface of the to-be-formed product. The invention further provides a 3D laser forming method.

Description

technical field [0001] The invention relates to a 3D laser forming device and a 3D laser forming method. Background technique [0002] SLM (Selective laser melting) technology is a technology that uses metal powder to be completely melted under the heat of a laser beam, and then cooled and solidified to form a shape. Although products with high complexity can be molded by SLM technology, during the molding process, due to the spherical nature and spheroidization of metal powder, unevenness often occurs on the edge of the product, so that the contour accuracy of the edge of the product is often not enough. achieve the required accuracy. It is necessary to leave a machining allowance for the workpiece in the design stage. The printed workpiece often needs to be processed by subsequent machining to meet the accuracy requirements, and even some complex inner cavities, deep holes, special-shaped holes and other structures cannot be processed by subsequent machining. In addition...

AI Technical Summary

Problems solved by technology

Although products with high complexity can be molded by SLM technology, during the molding process, due to the spherical nature and spheroidization of metal powder, unevenness often occurs on the edge of the product, so that the contour accuracy of the edge of the product is often not enough. Accuracy required

It is necessary to leave a machining allowance for the workpiece in the design stage. The printed workpiece often needs to be processed by subsequent machining to meet the accuracy requirements, and even some complex inner cavities, deep holes, special-shaped holes and other structures cannot be processed by subsequent machining. In addition, there is an inevitable positioning error problem in the transfer from the SLM printing equipment to the machine tool. These make it difficult for the current SLM technology to meet most application requirements in terms of processing accuracy, surface quality and processing efficiency, which seriously restricts the application of SLM technology in various fields.

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