Ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers

A surface oxidation and ultrasonic technology, which is applied in the field of ultrasonic-assisted cavitation abrasive flow finishing of the oxide layer on the surface of titanium alloy, can solve the problems of difficult control of the processing process, easy over-corrosion, poisonous gas and waste liquid pollution, etc., to avoid re-sticking Attachment, good uniformity, enhanced strength and randomness effects

Active Publication Date: 2020-04-03
SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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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 provide an ultrasonic-assisted cavitation abrasive flow finishing method for the oxide layer on the surface of titanium alloy to overcome the defects in the treatment of oxide layer on the surface of titanium alloy in the prior art, and to solve the problem of toxic gas waste in the process of removing the oxide layer on the surface of titanium alloy. Problems of liquid pollution, difficulty in processing process control, and easy over-corrosion

Method used

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  • Ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers
  • Ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers
  • Ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers

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Experimental program
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Effect test

Embodiment 1

[0059] The processed workpiece is a TC4 titanium alloy rod with a length of 80mm and a diameter of 50mm, and the surface is covered with a 60-70μm thick low-temperature oxide layer.

[0060] Step 1: forming a high-speed turbulent vortex, including: disposing a soft abrasive flow composed of pure water and 60# silicon carbide abrasive grains with a volume content of 20% in the working tank (2), and the liquid level is immersed in the workpiece. Start the turbulence generator (5) at the bottom center of the working tank (2) to make the solid-liquid two-phase fluid mix evenly and form a high-speed turbulent vortex;

[0061] Step 2: Forming a high-speed, high-pressure gas-liquid-solid three-phase fluid, including: starting the microbubble pump (7), and using the microbubble pump to extract a uniformly mixed solid-liquid two-phase flow to realize the generation of micronano bubbles and their fusion with the solid-liquid fluid , pressurization to form a high-speed high-pressure gas-...

Embodiment 2

[0068] The processed workpiece is a TC4 titanium alloy rod with a length of 80 mm and a diameter of 50 mm, and the surface is covered with a high-temperature oxide layer with a thickness of 600-700 μm.

[0069] Step 1: Forming a high-speed turbulent vortex, including: disposing soft water, 24# silicon carbide abrasive grains with a volume content of 15%, and 150# silicon carbide abrasive grains with a volume content of 15% in the working tank (2). Abrasive particle flow, the liquid level immerses the workpiece. The turbulence generator (5) at the bottom center of the working tank body (2) is activated to make the solid-liquid two-phase fluid mix uniformly and form a high-speed turbulent vortex.

[0070] Step 2: Forming a high-speed, high-pressure gas-liquid-solid three-phase fluid, including: starting the microbubble pump (7), and using the microbubble pump to extract a uniformly mixed solid-liquid two-phase flow to realize the generation of micronano bubbles and their fusion ...

Embodiment 3

[0076] The processed workpiece is a TC21 titanium alloy plate with length*width*thickness=120*120*3mm, covering a dense oxide layer with a thickness of 100μm to 150μm.

[0077]Step 1: forming a high-speed turbulent vortex, including: disposing soft water, 8% volume content of 150# silicon carbide abrasive grains, and 8 volume% volume content of 240# silicon carbide abrasive grains in the working tank (2). Abrasive particle flow, the liquid level immerses the workpiece. The turbulence generator (5) at the bottom center of the working tank body (2) is activated to make the solid-liquid two-phase fluid mix uniformly and form a high-speed turbulent vortex.

[0078] Step 2: Forming a high-speed, high-pressure gas-liquid-solid three-phase fluid, including: starting the microbubble pump (7), and using the microbubble pump to extract a uniformly mixed solid-liquid two-phase flow to realize the generation of micronano bubbles and their fusion with the solid-liquid fluid , pressurizati...

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Abstract

The invention provides an ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers. The method comprises the following steps: stirring a solid-liquidtwo-phase mixed fluid to form high-speed turbulence vortex; extracting the solid-liquid two-phase mixed fluid, mixing the solid-liquid two-phase mixed fluid with micro-nano bubbles to form a high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow; spraying the high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow to a workpiece in a tank body for staged surface treatment; meanwhile, emitting ultrasonic waves by an ultrasonic device configured below the workpiece to form an ultrasonic cavitation effect, and forming a negative fluctuation environment with positive and negative pressure alternating rapidly in the high-speed fluid in the tank body to cause expansion and compression of micro-nano bubbles in the high-speed fluid. Under the comprehensive action of turbulence, jet, cavitaiton and ultrasonic waves, a manner of combining cavitation abrasive grain jet and turbulence integrated surrounding type processing and ultrasonic enhancement isadopted, synchronous stripping of different in-situ defects of oxide scale and derivative and chain stripping of new defect points can be realized, the removal efficiency is high, and the processinguniformity is good.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to abrasive flow finishing technology, in particular to an ultrasonic-assisted cavitation abrasive flow finishing method for an oxide layer on the surface of a titanium alloy. Background technique [0002] Titanium alloy has extremely high specific strength, corrosion resistance and high temperature resistance, and is an important structural material in the aerospace field. However, titanium alloys have low thermal conductivity and poor cutting performance, and multiple annealing heat treatments are often required to eliminate the processing stress during processing. Due to the special performance requirements of the structural parts, it is also necessary to strengthen the heat treatment to obtain the comprehensive performance of high strength and good plasticity. Most of these heat treatments are carried out under the condition of no protective gas. The treatment tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C1/08B24C7/00B24C9/00
CPCB24C1/086B24C7/0084B24C9/00
Inventor 李洪涛张晓静屠学波常辉孙中刚
Owner SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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