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Laser additive repair method for titanium alloy valve rod

A laser additive and repair method technology, applied in the direction of additive processing, process efficiency improvement, additive manufacturing, etc., can solve the problems of strong tissue stress and mechanical constraint, complex thermal stress, large generation, etc., and the method is reliable. , easy to achieve, low cost effect

Inactive Publication Date: 2020-07-28
航发优材(镇江)增材制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the long-term periodic and severe heating of high-energy laser beams during the laser additive repair process of titanium alloy powder and matrix parts. The heat accumulation effect produces large and extremely complex thermal stress, tissue stress and mechanical constraints inside the parts. Force and its strong unsteady interaction and stress concentration lead to collapse, deformation and even cracking of parts. At the same time, titanium alloy has high activity in molten state and high oxidation and nitriding tendency at high temperature, providing suitable The laser additive process parameters and scanning path become the key link to ensure the alloy performance in the process of additive manufacturing and repair

Method used

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  • Laser additive repair method for titanium alloy valve rod
  • Laser additive repair method for titanium alloy valve rod
  • Laser additive repair method for titanium alloy valve rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A TC4 valve stem laser additive repair method, comprising the following steps:

[0031] Step 1: Through the previous TC4 powder laser additive single-channel process experiment, optimize 3 sets of suitable parameters for multi-channel multi-layer laser material additive experiments, conduct metallographic observation on the cladding layer, and obtain the best process parameters (such as image 3 ).

[0032] Step 2: Before repairing the titanium alloy valve stem, perform laser additive manufacturing of the titanium alloy performance test sample on the titanium alloy substrate (such as figure 2 ), and complete the tensile, impact and fatigue performance tests, evaluate the test results, and determine the final laser cladding repair process;

[0033] Step 3: Take photos and record the area to be repaired of the TC4 valve stem. The diameter of the valve stem is 60mm, the length of the area to be repaired is 200mm, and the depth of one side is 0.8mm, and the mechanical cle...

Embodiment 2

[0044] A TA2 valve stem laser additive repair method, comprising the following steps:

[0045] 1. Confirmation of valve stem wear

[0046] A certain type of valve stem, the material is TA2, the wear form: intensive scratches, the wear depth is about 0.5mm on one side, the length is 250mm, and the diameter is 65mm.

[0047] 2. Repair process and inspection

[0048] Step 1: Through the previous TA2 powder laser additive single-channel process experiment, 4 sets of suitable parameters were optimized for multi-channel multi-layer laser material additive experiments, and metallographic observation was carried out on the cladding layer to obtain the best process parameters (such as Figure 4 ). The optimal process experimental parameters of laser cladding are: laser power 800W, scanning speed 10mm / s, light spot 3mm, powder feeding volume 4g / min, powder feeding helium flow rate 5L / min, protective argon gas flow rate 20L / min, overlap rate 50%. The scanning path form of the multi-l...

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Abstract

The invention discloses a laser additive repair method for a titanium alloy valve rod. The laser additive repair method for the titanium alloy valve rod comprises the following steps: optimizing parameters and carrying out a multi-pass multi-layer laser additive experiment through an earlier-stage single-pass laser additive process experiment for a titanium alloy powder, and carrying out metallographic observation on a cladding layer to obtain the optimal process parameters; carrying out laser additive manufacturing printing for a performance test sample piece of the titanium alloy on a titanium alloy substrate, completing a performance test, evaluating a test result, and determining a repair process; carrying out photographing recording on an area to be repaired, and completing surface cleaning; carrying out accurate clamping on the titanium alloy valve rod, and locking the end part by a center; reserving machining allowance in an additive repair damage area carrying out coaxial powder feeding through laser, setting a scanning path to be spiral forward, enabling the left end and the right end of a starting point position to be alternating and rotate clockwise with time difference,and controlling temperature rise of the workpiece; and adopting fluorescence detection, machining according to the requirement of a drawing to restore a size, and delivering and using. According to the laser additive repair method for the titanium alloy valve rod, the requirement of safe use for the titanium alloy valve rod in a life cycle is guaranteed by optimizing the laser additive process parameters and a scanning path strategy.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing, in particular to a laser additive repair method for a titanium alloy valve stem. Background technique [0002] The American Society for Testing and Materials (ASTM) defines additive manufacturing (AM) as “the process of joining materials to fabricate objects from three-dimensional model data, usually layer by layer, as opposed to subtractive manufacturing methodologies.” Rapid prototyping (RP) and rapid Manufacturing (RM) are two widely accepted synonyms for AM technology. Over the past 20 years, AM has evolved from three-dimensional (3D) printers for RP to complex RMs that can directly create parts without the use of tools. In fact, it has recently entered a mature growth phase. AM is comparable to, and sometimes superior to, traditional manufacturing techniques in terms of cost, speed, reliability, and accuracy. [0003] Laser additive repair is an AM technology that use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/66B22F10/322B22F10/34B22F10/25B22F10/36B22F10/366Y02P10/25
Inventor 张峰孙兵兵张强赵海生张帆
Owner 航发优材(镇江)增材制造有限公司
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