IPC分类号：
B23K26/342 | B33Y10/00 | B33Y30/00
当前申请(专利权)人：
BEIJING UNIVERSITY OF TECHNOLOGY
原始申请(专利权)人：
BEIJING UNIVERSITY OF TECHNOLOGY
当前申请(专利权)人地址：
No.100 Pingleyuan Chaoyang District, Beijing, CN
工商统一社会信用代码：
12110000400687411U
发明人：
XIAO, RONGSHI | HUANG, TING | WU, QIANG | ZOU, JIANGLIN | XU, JIEJIE
摘要：
Provided is a method for laser additive manufacturing based on keyhole effects. The method includes the following steps. A welding wire and a laser beam are arranged, at certain angles, on two sides of a normal line of a substrate respectively. The laser beam is applied on the welding wire to generate a deep penetration melting keyhole. The welding wire absorbs energy of the laser beam and is heated and melted in a deep penetration melting mode. The welding wire transmits energy to a surface of the substrate to form a cladding layer. The laser beam irradiates the surface of the substrate after passing through the welding wire, and preheats the surface of the substrate in a heat conduction mode. The method can improve the formation efficiency of the wire-feeding laser additive manufacturing. By heating and melting the wire in the deep penetration melting mode, the melting rate of the wire is greatly improved. By heating and melting a part in the thermal conduction mode, the occurrence of defects such as keyhole-induced porosity can be effectively avoided. A system for the additive manufacturing based on the keyhole effects is also discussed.
技术问题语段：
The technical problem addressed in this patent text is how to improve the efficiency and energy utilization of laser additive manufacturing, which involves the formation of metal parts using laser technology. The current methods, selective laser melting and wire feeding, have limitations such as high processing time and cost, as well as low deposition efficiency. The new method aims to use the deep laser welding principle and improve the forming efficiency of laser additive manufacturing.
技术功效语段：
The present patent provides a method to improve the efficiency of wire feeding laser additive manufacturing by heating and melting the welding wire and workpiece in a deep penetration melting mode to increase the formation efficiency and avoid defects such as air hole. The technical effect of the method is to improve the manufacturing efficiency.
权利要求：
1. A method for laser additive manufacturing based on keyhole effects, being characterised by the following steps: arranging a welding wire (7) and a laser beam (5) at two sides of a normal line of a substrate (1) at certain angles with respect to the normal line respectively; applying a light spot of the laser beam (5) on a position of the welding wire (7) having a certain distance from the substrate (1) to produce a deep penetration melting keyhole (4), the welding wire (7) absorbing energy of the laser beam (5), being heated and melted in a deep penetration welding mode, and the welding wire (7) transiting energy to the substrate (1) to form a melting pool (3) and a cladding layer (2) at a first area; and after passing through the welding wire (7), the laser beam (5) irradiating a second area of the substrate (1) to preheat the second area of the substrate (1) in a thermal conduction mode.
2. The method for laser additive manufacturing based on keyhole effects according to claim 1, wherein the method adopts a front wire feeding mode, and the welding wire (7), the laser beam (5) and the normal line of the substrate (1) are in one plane, an angle between the welding wire (7) and the normal line is a first angle, and an angle between the laser beam (5) and the normal line is a second angel.
3. The method for laser additive manufacturing based on keyhole effects according to claim 2, wherein the first angle between the welding wire (7) and the normal line is 5° ~30°.
4. The method for laser additive manufacturing based on keyhole effects according to claim 2, wherein the second angle between the laser beam (5) and the normal line is 15° ∼45°.
5. The method for laser additive manufacturing based on keyhole effects according to claim 1, wherein the position of the welding wire (7) where the light spot is applied is 1 ~5mm away from a surface of a workpiece.