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Method for high-power laser selective melting 3D printing of high-speed rail brake discs

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

Active Publication Date: 2019-05-28
NORTHEASTERN UNIV
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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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  • Method for high-power laser selective melting 3D printing of high-speed rail brake discs
  • Method for high-power laser selective melting 3D printing of high-speed rail brake discs
  • Method for high-power laser selective melting 3D printing of 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 θ between the upper and lower working surfaces of the brake disc model and the base plate = 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

The invention discloses a method for high-power laser selective melting 3D printing of high-speed rail brake discs. The method comprises the following steps: (1) brake disc models are introduced into3D printing software, and are inclined; (2) support models are added between the brake disc models and substrate models through software, and are divided into cylindrical support models, square support models and thin-wall support models; (3) the sizes of cylindrical supports, upper thin walls, lower thin walls, outer thin walls, inner thin walls, first middle thin walls and second middle thin walls are set; (4) the brake disc models and all the support models are sliced; (5) the models are introduced to a quick molding production system for laser selective melting molding; and (6) entities are taken out for annealing, cutting and polishing. The method solves the problems of formation of suspension structures of brake discs and deformation cracking of parts in the forming process, prominently improves the part forming efficiency, and solves the problem of easy deformation cracking of the high-speed rail brake disc parts in subsequent machining process.

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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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
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