Laser additive manufacturing method and device of metal parts

A metal parts, laser additive technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of heavy load, overweight machine tool, increased manufacturing cost and difficulty coefficient, etc., to reduce the complexity of the device, spare metal powder The effect of reducing the amount and improving the forming accuracy

Active Publication Date: 2014-04-16
TECH LASER TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is really necessary to use SLM technology to manufacture large-size parts, a large-size forming cylinder must be used. The large amount of powder carried by the large-size forming cylinder will bring a heavy load to the machine tool, making the mechanical components such as pistons and screw rods in the SLM forming equipment loaded. The load of the equipment is large, and the manufacturing cost and difficulty factor of the equipment are greatly increased.
[0012] To sum up, LMD technology is generally used to manufacture large-scale metal parts with relatively simple shapes and low dimensional accuracy requirements; while SLM technol

Method used

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  • Laser additive manufacturing method and device of metal parts
  • Laser additive manufacturing method and device of metal parts
  • Laser additive manufacturing method and device of metal parts

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0085] Examples 1 to 4 adopt Figure 4 The structure shown is realized.

[0086] (1) Modify the CAD model of metal part 1 to obtain the layered contour information of metal part 1 and thin wall 8: add a 4mm wide thin wall 8 and thin wall 8 at a distance of 1mm from the periphery of the metal part outline. Close to form a "conformal cylinder" 9; use a computer to slice the reconstructed 3D CAD model according to the required accuracy, and obtain the scanning contour information of each layer of the thin wall 8 and the metal part 1 respectively;

[0087] (2) Use LMD technology to manufacture a thin wall 8: The laser is converted to the light guide system 23 through the beam converter 27, reaches the optical focusing system 22, and then focuses on the working surface into a suitable spot, and the control system controls the machine tool to drive the laser And the optical focusing system scans along the contour and path planning of the thin-walled wall 8. The metal powder 5 is sent fro...

example 2-4

[0095] The process is shown in Example 1, and the process parameters are shown in Table 1 below.

example 5

[0097] In this example, the thin-walled wall 8 is prepared by welding, and the steps are as follows:

[0098] (1) Transform the three-dimensional CAD model of the metal part to obtain the layered contour information of the metal part 1 and the thin wall 8. Modify the 3D CAD model of metal part 1 in the computer control system software: add a closed outer edge with a width of 1mm (ie thin wall 8) at a distance of 25mm from the edge contour of metal part 1, and thin wall 8 can The conformal cylinder 9 is formed. According to the shape of the part, the conformal cylinder 9 can be a cavity enclosing the entire part, or it can be a plurality of cavities that can form a closed area partitioned according to the features of the part; according to the required dimensional accuracy of the manufactured part, Use a computer to slice the modified CAD model with thin-walled walls to obtain the laser plane scanning contour information of the metal part 1 and the plane contour information of ea...

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PUM

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Abstract

The invention discloses a laser additive manufacturing method and a laser additive manufacturing device of metal parts. In the laser additive manufacturing method, a layered-manufactured profile-followed cylinder is used as a forming cylinder, namely before each metal part layer is manufactured, a layer of closed thin wall is manufactured, the formed cavity is used as the profile-followed cavity, the height of the profile-followed cavity is the same as that of the metal part layer to be manufactured, and the shape of the profile-followed cavity is adapted to that of the metal part layer to be manufactured, so as to provide a plane reference and a cavity for laying powder; the layered-manufactured profile-followed cylinder is used, a scanning galvanometer is used for performing selective laser melting and forming, the metal part layers are manufactured layer by layer, layers of the profile-followed cavities are finally stacked to form the profile-followed cylinder, and the layers of metal parts are stacked to form metal parts. The laser additive manufacturing device comprises a laser galvanometer melting and forming device and a thin wall preparation device which alternatively work, so as to accomplish the selective laser melting and forming process. The method and the device keep the advantages of the selective laser melting (SLM) metal additive manufacturing technology, uses the profile-followed cylinder to break the limit of the conventional SLM device fixed-size forming cylinder, and thus achieving the high-precision manufacture of the large-size even over-sized parts.

Description

Technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and specifically relates to a method and equipment for additive manufacturing of high-precision metal parts, and is particularly suitable for the manufacture of large-sized or even super-sized complex metal parts. Background technique [0002] In recent years, laser additive manufacturing technology based on "discrete-stack" and "additive forming" has been able to directly manufacture metal parts with a density of nearly 100% from CAD models and metal powders. Common metal materials such as tool steel, stainless steel, nickel alloy, copper alloy, titanium alloy and tungsten alloy have all been successfully trial-produced, and the manufactured metal parts are gradually moving towards practical industrial applications. [0003] At present, there are two methods for directly manufacturing 100% density metal parts using laser additive manufacturing technology: one is laser melting depos...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 曾晓雁朱海红王福德王泽敏陈立新李重洋张红波
Owner TECH LASER TECH SHANGHAI CO LTD
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