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Method for laser composite chemical polishing of titanium alloy based on galvanometer

A chemical polishing and titanium alloy technology, which is applied in the field of precision surface treatment, can solve the problems of inability to achieve precise polishing of selected areas, inability to use for a long time, corrosion of electrolytic devices, etc., to achieve the elimination of airtight devices, easy configuration, and recycling high rate effect

Active Publication Date: 2020-04-17
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nitric acid it contains will corrode the electrolysis device and cannot be used for a long time
Moreover, it cannot achieve precise polishing of the selected area. At the same time, electrolytic polishing requires special fixtures, which increases the cumbersomeness of the whole process.

Method used

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  • Method for laser composite chemical polishing of titanium alloy based on galvanometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Sample pretreatment: The titanium alloy is processed into a sample of 40mm×20mm×4mm by wire cutting, and the surface is cleaned with a milling cutter.

[0028] (2) Test the surface roughness S of the sample with a three-dimensional profiler a = 1.32um.

[0029] (3) Preparation of chemical solution: Add 12.5g of sodium nitrate, 4.95g of potassium chloride and 4.97g of calcium chloride into 1000ml of deionized water, stir until fully dissolved to obtain a chemical solution. Heat to 37°C and keep warm.

[0030] (4) Laser polishing treatment and process parameter setting: place the sample whose roughness has been measured in the chemical solution in step (3), immerse the sample, and keep the sample 2mm away from the surface of the solution. Set the water inflow and outflow to 100ml / min, place it on a 500w galvanometer laser workbench, set the laser power to 300w; scan speed to 400mm / s, line spacing to 0.02mm, spot size to 10mm, defocus amount is +2mm. The number of ...

Embodiment 2

[0033] (1) Sample pretreatment, measure the initial roughness S a =1.31um, the solution preparation steps refer to Example 1, laser polishing treatment and process parameter setting: place the sample whose roughness has been measured in the chemical solution of step (3), immerse the sample, and the sample is 2mm away from the solution surface. Set the water inflow and outflow to 100ml / min, place it on a 500w galvanometer laser workbench, set the laser power to 400w; scan speed to 600mm / s, line spacing to 0.04mm, spot size to 12mm, defocus is +4mm. The number of scans is one time, and the scanning area is 10mm×10mm.

[0034] (2) Take out the polished sample, wash it with absolute ethanol, and dry it. The roughness S measured under the three-dimensional profile a = 0.45um.

Embodiment 3

[0036] (1) Sample pretreatment, measure the initial roughness S a =1.32um, the solution preparation steps refer to Example 1, laser polishing treatment and process parameter setting: place the sample whose roughness has been measured in the chemical solution of step (3), immerse the sample, and the sample is 2mm away from the solution surface. Set the water inflow and outflow to 100ml / min, place it on a 500w galvanometer laser workbench, set the laser power to 500w; scan speed to 800mm / s, line spacing to 0.06mm, spot size to 15mm, defocus is +6mm. The number of scans is one time, and the scanning area is 10mm×10mm.

[0037] (2) Take out the polished sample, wash it with absolute ethanol, and dry it. The roughness S measured under the three-dimensional profile a = 0.48um.

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Abstract

The invention provides a method for laser composite chemical polishing of a titanium alloy based on a galvanometer. By means of the method, a sample is soaked in a prepared chemical solution while laser polishing is conducted, air is isolated, and in addition, micro pits cannot be generated. By means of the titanium alloy surface polishing treatment method, the surface roughness of a titanium alloy can be effectively reduced, glossiness is improved, the surface quality is improved, and a complex airtight device can also be omitted.

Description

technical field [0001] The invention relates to a titanium alloy polishing method based on vibrating mirror laser composite chemistry, which belongs to the technical field of precision surface treatment. Background technique [0002] Titanium and titanium alloys have a series of excellent characteristics such as low density, good corrosion resistance, and high specific strength, so they are widely used in various fields such as aviation, aerospace, and medical treatment. However, with the continuous improvement of the requirements for the smooth surface of titanium and titanium alloys in various industries, it is particularly important to prepare titanium and titanium alloys with bright and smooth surfaces. [0003] Laser polishing is a new thermal processing method to obtain high surface finish of materials. The inherent essence of this process is the remelting of the material surface caused by laser heating. No matter the laser polishing process is carried out on the mac...

Claims

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Application Information

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IPC IPC(8): C23F3/04C23F4/00
CPCC23F3/04C23F4/00
Inventor 吴国龙王淼姚建华
Owner ZHEJIANG UNIV OF TECH
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