A Laser Cladding Forming Method of Variable Width Thin-walled Parts Based on Optical External Coaxial Powder Feeding

Abstract

The invention relates to the technical field of laser cladding forming, and provides a laser cladding forming method for variable-width thin-walled parts based on optical external coaxial powder feeding. Step 1: Establish a three-dimensional model of the variable-width thin-walled part to be formed, layer the model, and obtain contour level information; Step 2: Calculate the number of melting channels overlapped by the current layer and the overlap rate at different widths; Step 3: Calculate the scanning speed at different widths of the current layer; Step 4: According to the number of melt channels calculated on the current layer, the overlap rate at different widths and the scanning speed, use the optical external coaxial powder feeding cladding head to perform laser cladding on the current layer ;Step 5: Raise the height of the single layer of the cladding head, enter the next layer, repeat steps 2 to 4, and carry out the cladding of the next layer; Step 6: Repeat step 5 until the thin-walled part to be formed with variable width is manufactured . The invention can realize the variation of the width of the thin-walled part and the flattening of the top, and improves the forming efficiency and quality of the variable-width thin-walled part.

Description

technical field [0001] The invention relates to the technical field of laser cladding forming, in particular to a laser cladding forming method for variable-width thin-walled parts based on optical external coaxial powder feeding. Background technique [0002] Laser cladding forming technology is a technology formed by combining laser cladding and rapid prototyping. It uses laser to melt preset or synchronously supplied metal powder to achieve material addition and finally realize the forming of three-dimensional solid parts. The laser cladding forming process is affected by multiple parameters, the main process parameters are laser power, scanning speed, powder feeding rate, spot diameter, shielding gas flow, etc. Different combinations of these parameters may have different effects on the cladding geometry and mechanical properties. [0003] Large parts with variable width and thin walls have been widely used in high-tech fields such as aerospace. This kind of parts has ...

AI Technical Summary

Problems solved by technology

One is based on the optical coaxial powder feeding method and adopts the method of multi-pass overlapping. This method only realizes variable width by changing the overlapping ratio, which is very easy to cause uneven cladding layer height, and due to the cumulative effect, the height difference of each place getting bigger and bigger, eventually leading to forming failure

The other is a method proposed by Soochow University based on internal light powder feeding to complete the forming by changing the laser spot diameter for one scan. Although this method improves the forming efficiency and quality of the existing process, it is only applicable to the laser spot diameter that can be changed. There is no better method for the currently widely used optical powder delivery

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