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Selective laser melting forming method for TC4 titanium alloy workpiece

A technology of selective laser melting and forming method, which is applied in the direction of additive manufacturing and additive processing, and can solve problems such as poor density and poor surface roughness

Pending Publication Date: 2022-04-22
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problems of poor surface roughness and poor density of the workpiece in the existing selective laser melting 3D printing method, and provides a selective laser melting forming method for TC4 titanium alloy parts

Method used

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  • Selective laser melting forming method for TC4 titanium alloy workpiece
  • Selective laser melting forming method for TC4 titanium alloy workpiece
  • Selective laser melting forming method for TC4 titanium alloy workpiece

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: The selective area laser melting forming method of the TC4 titanium alloy parts of the present embodiment is carried out according to the following steps:

[0024] 1. Use 3D modeling software to model parts and process data, and convert it into a data format (STL file) that can be sliced;

[0025] 2. Create a support at the bottom of the established model, slice the 3D model and the support together to obtain the contour data of the interface of each layer, and import this data into the AFS-M260 metal powder (SLM) 3D printer;

[0026] 3. According to the program, the AFS-M260 metal powder (SLM) 3D printer controls the powder spreading device to spread the powder on the substrate of the forming cylinder according to the powder thickness of 60 μm;

[0027] 4. The laser scanning system scans the molten alloy powder under the conditions of laser power of 300W, scanning speed of 1.5m / s, and scanning distance of 100μm. The molten metal is cooled and solidified t...

Embodiment 2

[0037] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the scanning speed in step 4 is 0.9 m / s, and the others are the same as Embodiment 1.

Embodiment 3

[0038] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the scanning speed in step 4 is 2.4m / s, and the others are the same as Embodiment 1.

[0039] The compactness of the TC4 titanium alloy parts prepared in Examples 1, 2 and 3 is tested, and the results show that the densities of the TC4 titanium alloy parts prepared in Examples 1, 2 and 3 are respectively 98.98%, 93.7% and 94.5% %. The microstructure figure of the TC4 titanium alloy parts prepared by embodiment 2 is as follows Figure 5 shown, from Figure 5 It can be seen that the holes are seen, and the distribution of these holes is uneven and the size is different. This is because when the scanning speed is low, the laser spot stays on the powder per unit volume for a long time, and the energy absorbed by the powder per unit time is relatively small. High, the melt will appear agglomeration or even overburning, and the metal evaporation caused by high-energy input will generate recoil for...

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Abstract

The invention discloses a selective laser melting forming method of a TC4 titanium alloy workpiece, and relates to a forming method of an alloy workpiece. The method aims at solving the technical problems that a workpiece obtained through an existing selective laser melting 3D printing method is poor in surface roughness and density. The method comprises the following steps of: 1, performing modeling and data processing on a part by utilizing three-dimensional modeling software, and converting into a data format of a cutting layer; 2, establishing a support body at the bottom of the established model, cutting the support body into sheets, and importing data into 3D printing equipment; 3, spreading powder; fourthly, laser melting is conducted, and the single-layer outline of the part is obtained; 5, printing layer by layer to obtain a primary formed part; and sixthly, heat treatment is conducted, and the titanium alloy workpiece is obtained. The appearance of the fracture of the TC4 titanium alloy workpiece is the mixed fracture of ductile fracture and brittle fracture, the microscopic structure of the TC4 titanium alloy is an alpha + beta mixed structure, the tensile strength is 1250-1285 MPa, the ductility is 11%-12%, and the hardness is 380-385 HV. The method can be used in the field of additive manufacturing.

Description

technical field [0001] The invention relates to a forming method of an alloy product. Background technique [0002] Titanium alloy has low density, high strength, excellent high temperature resistance and good corrosion resistance, and is widely used in aerospace, automobile, medical equipment and sports equipment and other fields. Traditional titanium alloy manufacturing methods include stripping, casting, forging, etc. These three methods generally have the disadvantages of long manufacturing cycle, low yield and high cost. In recent years, rapid developments in additive manufacturing technologies are addressing these issues. Additive manufacturing technology, also known as 3D printing technology, is a process that directly manufactures physical parts from digital models by layer-by-layer accumulation. Selective Laser Melting (SLM) is currently the most commonly used metal additive manufacturing technology. It has the following disadvantages. First, the dimensional accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/366B22F10/85B22F10/64B33Y10/00B33Y50/02
CPCB22F10/28B22F10/366B22F10/85B22F10/64B33Y10/00B33Y50/02
Inventor 李艳春李岩张煜宋美慧谢洋王琦崔向红王艳丽张玉婷赵晓庆徐志远
Owner HEILONGJIANG HEIKE TECH CO LTD
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