A high-power laser selective melting method for 3D printing high-speed rail brake discs

A laser selective melting and 3D printing technology, applied in the field of additive manufacturing, can solve problems such as deformation and cracking, achieve the effects of eliminating residual stress, good forming quality, and improving forming efficiency

Active Publication Date: 2021-04-23
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the "shape control" problem of laser selective melting 3D printing technology to manufacture complex components of large-scale high-speed rail brake discs, this invention provides a method for high-power laser selective melting 3D printing high-speed rail brake discs, specifically including the innovation of the brake disc model Design, and laser selective melting 3D printing 24CrNiMoRE alloy steel process and post-processing; by rotating and tilting the brake disc model at a certain angle, the problem of adding support is solved; by optimizing the design of the added support type and structure, the suspension structure of the brake disc is solved The problem of forming and controlling the deformation and cracking of the entire part; through the research of high-power laser selective melting process parameters, the manufacturing efficiency is greatly improved under the premise of ensuring good forming quality; through the post-processing process, the residual brake disc parts after forming are eliminated Stress, to solve the problem of deformation and cracking of high-speed rail brake disc parts in the subsequent processing

Method used

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  • A high-power laser selective melting method for 3D printing high-speed rail brake discs
  • A high-power laser selective melting method for 3D printing high-speed rail brake discs
  • A high-power laser selective melting method for 3D printing high-speed rail brake discs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Import the designed brake disc model into the 3D printing software. The structure of the brake disc model is as follows: figure 1 As shown; set the diameter D of the brake disc model to 210mm, and then set the brake disc model to tilt, so that the angle between the upper and lower working surfaces of the brake disc model and the substrate is θ=45°, the structure is as follows figure 2 As shown; the brake disc model projection area is provided with a horizontal substrate model; the brake disc model is an axisymmetric structure, consisting of an annular upper part, an annular lower part, a reinforcing rib 5 and a plurality of assembly nuts connected to the reinforcing rib An integral structure composed of parts 6; the ring-shaped upper part is composed of the upper working panel 1 and the upper connecting plate 2 at the lower part; the top surface of the upper working panel 1 is called the upper working surface, and the side is called the side of the upper working surface...

Embodiment 2

[0057] Method is with embodiment 1, and difference is:

[0058] (1) The structure of the brake disc model is as follows: Figure 8 As shown; when the brake disc model is tilted, the angle between the upper and lower working surfaces and the base plate is θ=55°;

[0059] (2) When the top edge of the upper thin wall is connected to the side edge of the upper working surface, the outer edge of the top edge of the upper thin wall is connected to the upper edge of the side edge of the upper working surface, and the part where the upper thin wall is connected to the side edge of the upper working surface, It occupies 1 / 2 of the perimeter of the side of the upper working surface; when the top edge of the lower thin wall is connected with the side of the lower working surface, the outer edge of the top edge of the lower thin wall is connected with the lower edge of the side of the lower working surface, and the lower thin wall The part connected with the side of the lower working sur...

Embodiment 3

[0065] Method is with embodiment 1, and difference is:

[0066] (1) The structure of the brake disc model is as follows: Figure 10 As shown; when the brake disc model is tilted, the angle between the upper and lower working surfaces and the base plate is θ=50°;

[0067] (2) When the top edge of the upper thin wall is connected to the side edge of the upper working surface, the outer edge of the top edge of the upper thin wall is connected to the upper edge of the side edge of the upper working surface, and the part where the upper thin wall is connected to the side edge of the upper working surface, It occupies 1 / 2 of the perimeter of the side of the upper working surface; when the top edge of the lower thin wall is connected with the side of the lower working surface, the outer edge of the top edge of the lower thin wall is connected with the lower edge of the side of the lower working surface, and the lower thin wall The part connected with the side of the lower working su...

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Abstract

A method for high-power laser selective melting of 3D printed high-speed rail brake discs, comprising the following steps: (1) import the brake disc model into 3D printing software, and set the tilt of the brake disc model; (2) use the software on the brake disc model Add a support model between the substrate model and the support model. The support model is divided into cylindrical support model, square support model and thin-wall support model; (3) set the cylindrical support, upper thin wall, lower thin wall, outer thin wall, The size of the inner thin wall, the first middle thin wall and the second middle thin wall; (4) slice the brake disc model and all support models; (5) guide the model to the rapid prototyping manufacturing system for laser selective melting forming, (6) After the entity is taken out, it is annealed, cut and polished. The method of the invention solves the problem of forming the suspension structure of the brake disc and the deformation and cracking of the parts during the forming process, significantly improves the forming efficiency of the parts, and solves the problem of deformation and cracking that is easy to occur in the subsequent processing of the high-speed rail brake disc parts.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for selectively melting high-power lasers to 3D print high-speed rail brake discs. Background technique [0002] High-speed rail brake discs are key components to ensure the reliable operation of high-speed trains. There are complex ribs and heat dissipation ribs inside; traditional manufacturing methods include casting, heat treatment, precision machining, etc., and there are problems such as long production cycles and complicated processes. At the same time, the core technology is monopolized by foreign countries and has formed related technical protection; laser selective melting 3D printing, as one of the laser additive manufacturing technologies, has unique advantages in the manufacture of parts with complex cavity structures due to the powder coating method. It is a new type of industrialization technology focused on development at home a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F3/24B22F5/10B33Y10/00
CPCY02P10/25
Inventor 陈岁元魏明炜孙苗贾无名周林崔彤梁京刘常升
Owner NORTHEASTERN UNIV LIAONING
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