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Method for improving surface evenness of laser rapid forming metal part

A technology of laser rapid prototyping and surface smoothness, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems of difficult control of the size and shape accuracy of laser rapid prototyping parts

Inactive Publication Date: 2013-12-11
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0005] In order to solve the problem that the size and shape accuracy of laser rapid forming parts is difficult to control, the present invention provides a method for improving the surface smoothness of laser rapid forming metal parts, which effectively reduces manufacturing costs and improves processing efficiency

Method used

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  • Method for improving surface evenness of laser rapid forming metal part
  • Method for improving surface evenness of laser rapid forming metal part
  • Method for improving surface evenness of laser rapid forming metal part

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Embodiment

[0051] According to the range of the main process parameters of the rapid prototyping technology in the present invention (see Table 1), different commonly used value combinations are selected for single-pass cladding experiments (that is, the laser power P is selected from 500 / 600 / 700 / 800 / 900W, and the spot diameter D is selected from 2 / 3 / 4mm, the powder feeding rate M is selected as 2 / 4 / 6 / 8 / 10g / min, and the scanning speed V is selected as 2 / 4 / 6 / 8 / 10mm / s), and all experiments under the combination of the above process parameters are comprehensively compared It is found that the line width and line height of the cladding line formed under the parameters of laser power P=700W, spot diameter D=3mm, powder feeding rate M=4g / min, and scanning speed V=6mm / s are the highest. Stable, the most regular geometric shape, the most uniform size, relatively high surface finish, and the best wettability with the substrate; using the combination of the above process parameters, the measured si...

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Abstract

The invention relates to a method for improving the surface evenness of a laser rapid forming metal part. According to the method, a formula related to cladding line width and cladding line height can be deduced according to a critical ideal overlapping model of adjacent cladding tracks, the ideal overlapping rate (the optimal scanning interval) of the adjacent cladding tracks can be figured out through the formula, so that the plane scanning process for overlapping the cladding lines into a plane can be carried out with the ideal overlapping rate as the technological parameter. Through the model, the optimal scanning interval can be determined scientifically and efficiently, the forming evenness of an overlapping plane is accordingly improved, repeated, tedious, time-consuming and labor-consuming experiment exploring processes are avoided, meanwhile, the manufacturing cost such as raw material loss and equipment loss are saved, and the method is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of rapid prototyping and rapid manufacturing, in particular to a method for improving the surface smoothness of laser rapid prototyping metal parts. Background technique [0002] Laser direct rapid prototyping technology is an advanced manufacturing technology developed on the basis of rapid prototyping technology that appeared in the late 1980s combined with synchronous feeding laser cladding technology. It uses high-energy laser beams to locally melt the metal surface to form a molten pool. Metal raw materials are sent into the molten pool synchronously to form a new metal layer that is metallurgically combined with the base metal and has a very low dilution rate. The functional three-dimensional metal solid parts of any shape or the near-shaped parts that only need a small amount of finishing are piled up by cladding layer by layer, which is essentially three-dimensional laser cladding under computer cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 张凯尚晓峰李妙妍刘伟军张新敏
Owner SHENYANG POLYTECHNIC UNIV
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