CN109778091A - A kind of high-strength titanium alloy pipes case hardening process - Google Patents
A kind of high-strength titanium alloy pipes case hardening process Download PDFInfo
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- CN109778091A CN109778091A CN201711112604.5A CN201711112604A CN109778091A CN 109778091 A CN109778091 A CN 109778091A CN 201711112604 A CN201711112604 A CN 201711112604A CN 109778091 A CN109778091 A CN 109778091A
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- titanium alloy
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- lathe
- ultrasonic wave
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Abstract
The invention discloses a kind of outer surface method for curing for the high-strength titanium alloy pipes for belonging to materials processing technology field.Specifically ultrasonic wave processing dedicated tool is mounted on the knife rest of lathe；Frequency of use is that 30KHz supersonic generator carries out ultrasonic impact hardening processing to the outer surface of titanium alloy pipe, adjust lathe revolving speed, the wire velocity control for rotating titanium alloy pipe outer surface is in 10~20m/min, and the long feed speed control of ultrasonic wave dedicated tool is in 0.15~0.3mm；After completion of processing, ultrasonic equipment current value is transferred to 0.5A hereinafter, closing ultrasonic equipment.The present invention provides the technological parameters for using ultrasonic wave processing mode that high-strength titanium alloy pipes are carried out with Surface hardened layer processing on lathe high-strength titanium alloy pipes outer surface can be made to obtain optimal ultrasonic wave hardening effect by this technological operation.The technique can effectively improve the appearance surface hardness and wearability of titanium alloy pipe, reduce surface roughness.
Description
Technical field
The invention belongs to materials processing technology field, in particular to the outer surface hardening side of a kind of high-strength titanium alloy pipes
Method.Processing technology is hardened more particularly to a kind of outer surface ultrasonic impact of titanium alloy pipe, which can effectively improve titanium conjunction
The appearance surface hardness and wearability of golden tubing reduce surface roughness.
Background technique
High-strength titanium alloy pipes have the characteristics that intensity is high, density is low, corrosion resistance and heat-resist, are Aeronautics and Astronautics, stone
The ideal material of the fields such as oil, chemical industry, ship key position.But since the hardness of titanium alloy is lower, coefficient of friction is big, wear-resisting
The disadvantages of property is poor, affects its service life and application range to a certain extent.Using suitable Case hardening techniques, do not dropping
Under the premise of low matrix mechanical property, the surface hardness of titanium alloy pipe is improved, is to improve its surface abrasion resistance and service life
Effective way, the application range of high-strength titanium alloy pipes can be expanded.Therefore, correlation engineering technical staff is to titanium alloy surface
Hardening technique has carried out extensive research.
Metallic surface method for curing almost all is applied in the surface treatment of titanium alloy at present, open report can
The surface-hardening treatment method for titanium alloy seen includes thermo-chemical treatment (gas nitriding, ionic nitriding), at shot blasting on surface
Reason, ion implanting, surface anodization processing, surface-coating technology, vapor deposition film technology, electrical discharge machining, laser add
Work etc..
The method of gas nitriding or ionic nitriding, although can be improved titanium alloy surface hardness, due to being seeped to improve
Nitrogen efficiency, nitriding medium need to contain ammonia or nitrogen-hydrogen mixed gas, and nitridation process must carry out under higher high temperature, nitriding
Hydrogen in these penetration enhancers easily causes titanium alloy to generate hydrogen embrittlement because inhaling hydrogen.Therefore, in nitriding process, it is not allow for the atmosphere of hydrogen
In the presence of causing efficiency of nitridation extremely low, nitride layer depth and hardness are difficult to reach requirement.
Bead achievees the purpose that surface peening and making titanium alloy surface generate plastic deformation, but shot-peening can make
The bright and clean surface roughness of the titanium alloy pipe of rolling increases, although improving the wearability of itself in this way, is easy to cause
The other parts matched with the titanium alloy member generate abrasion.
The major advantage of ion implantation is that film layer is combined with matrix, and anti-strip ability is strong, and injection process does not require
Substrate temperature is increased, so as to keep workpiece geometric accuracy.But ion implantation low efficiency, and existing ion implantation device
Be not suitable for being surface-treated 3 meters of length or more of tubing.
Surface anodization processing is the common approach of raising titanium alloy corrosion resistance and wearability, but due to titanium alloy tube
For material in processing and heat treatment process, surface easily forms dense oxidation film, must effectively remove in anodic oxidation, otherwise serious shadow
Anodic oxidation film quality is rung, however its cleaning difficulty is larger.In addition, either removing original oxide layer or anodic oxidation
Process requires to employ a large amount of acid, alkali and a variety of chemical reagent, considerably increases subsequent wastewater treatment cost, but also difficult
To reach increasingly harsher environmental protection standard.
Surface-coating technology is to improve the antioxidative effective ways of titanium alloy, if but hard for improving titanium alloy surface
Degree and wearability, this hard coat and being easy to happen for titanium alloy substrate crack and flake off.
Vapour deposition process prepares DLC film in titanium alloy surface, and the surface hardness and rub resistance of titanium alloy can be improved
Property.But when Ti content is more than 9% in film, the hardness of film will decline, and film and basal body binding force are limited.
Laser melting coating processing is that the alloy powders such as CoCrW are formed cladding figure layer in titanium alloy surface, to improve titanium conjunction
Golden watch surface hardness and wearability, but the uniformity of film layer, compactness and crack problem not yet solve, and this method is difficult to
Realize all standing in long length titanium alloy pipe surface.
Differential arc oxidation (MAO) technology is that parent metal is directly become oxygen by micro-arc discharge area instantaneous high-temperature high-pressure sinter
Compound ceramics, and thicker oxidation film is obtained, the hardness Gao Bingyu metallic matrix of film is well combined, and improves titanium alloy surface
The performances such as wear-resistant, anticorrosive, heat shock resistance, with good application prospect.
Ultrasonic impact processing is to push percussion tool to rush with 10,000 times per second or more frequencies using powerful ultrasonic wave
Metal object surface is hit, so that metal surface is generated biggish compactibility deformation, ultrasonic impact position is strengthened, to make metal
The intensity and hardness of superficial layer all increase significantly, while reducing workpiece surface roughness.Chinese patent CN101503755,
CN101502881 etc. provides only ultrasonic metallic surface processing device, does not provide specific processing technology.Chinese patent
CN1013111972A, CN103072049A, CN103084648A, CN103084634A, CN103084608A are each provided
Lathe, cylindrical grinder, planer, milling machine, boring machine are using Ultrasonic Machining to 5 kinds of materials such as carbon steel, stainless steel, cast iron, copper, aluminium
Matter metallic surface processing technology.
So far, the related processing technology report that titanium alloy surface hardness is improved using ultrasonic impact processing method is had no
Road.
Summary of the invention
The object of the present invention is to provide a kind of high-strength titanium alloy pipes case hardening process, specifically used lathe, frequency are
30KHz supersonic generator, ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool, adopt high-strength titanium alloy pipes surface
It is hardened with ultrasonic impact processing technology, which comprises the steps of:
1) ultrasonic wave processing dedicated tool is mounted on the knife rest of lathe；
2) cable for connecting supersonic generator, ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool is connected；
3) high-strength titanium alloy pipes are clamped in lathe spindle, high-strength titanium alloy pipes are carrying out ultrasonic surface hardening processing
Before need to meet following requirement:
A) straightness :≤1mm/m
B) external diameter circularity :≤0.05mm
C) outer diameter tolerance :≤0.1mm
D) surface roughness: Ra0.8~3.2 μm
E) ultrasonic wave processing surplus: 0.005~0.06mm；
4) tool position is adjusted, center and the tubing centre-height deviation≤± 0.5mm of cutter, and center cutter and tubing table are made
Face contact and the pressure for applying 30~300kg to tubing；
5) ultrasonic equipment, adjustment ultrasonic device current value to 0.8A~1.2A are opened；
6) start lathe, adjust lathe revolving speed, the wire velocity control for rotating titanium alloy pipe outer surface in 10~20m/min,
The long feed speed control of ultrasonic wave dedicated tool is in 0.15~0.3mm；
7) ultrasonic equipment current value is transferred to 0.5A hereinafter, closing ultrasonic equipment switch by completion of processing.
8) high-strength titanium alloy pipes surface is tested, the surface roughness value of tubing reaches Ra0.4 hereinafter, hardness mentions
High by 25% or more, wearability significantly improves；Or automatic testing equipment is installed on lathe, hardness or roughness test are shown on the spot
As a result.
The beneficial effects of the invention are as follows provide on lathe using ultrasonic wave processing mode to high-strength titanium alloy pipes into
The technological parameter of row Surface hardened layer processing can make high-strength titanium alloy pipes outer surface obtain rough surface by this technological operation
Angle value reaches Ra0.4 hereinafter, hardness improves 25% or more ultrasonic wave hardening effect.
Specific embodiment
The present invention provides a kind of high-strength titanium alloy pipes case hardening process, and specifically used lathe, frequency are 30KHz ultrasound
Wave producer, ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool use ultrasonic wave to high-strength titanium alloy pipes surface
Impact processing technology is hardened ,~by taking TC10 titanium alloy pipe as an example, it is specific as follows that ultrasonic surface impacts processing technology:
(1) equipment that the ultrasonic impact processing technology is used include lathe, output frequency be 30KHz supersonic generator,
Ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool；
(2) ultrasonic wave processing dedicated tool is mounted on the knife rest of lathe；
(3) cable for connecting supersonic generator, ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool is connected；
(4) the TC10 titanium alloy pipe of 52 × Φ of Φ, 40 × 3000mm is clamped in lathe spindle, the mode that is loaded and turnery processing
When it is consistent.Tubing bending deformation under tool pressure in order to prevent should install and use follow-rest.TC10 titanium alloy pipe is carrying out
It needs to meet following requirement before ultrasonic surface hardening processing:
F) straightness :≤1mm/m
G) external diameter circularity :≤0.05mm
H) outer diameter tolerance :≤0.1mm
I) surface roughness: Ra0.8~1.6 μm
J) ultrasonic wave processing surplus: 0.01~0.03mm
(5) tool position is adjusted, center and the tubing centre-height deviation≤± 0.5mm of cutter, and center cutter and tubing are made
Surface contact and the pressure for applying 30~300kg to tubing；
(6) ultrasonic equipment, adjustment ultrasonic device current value to 1.2A are opened；
(7) start lathe, adjust lathe revolving speed, the wire velocity control for rotating titanium alloy pipe outer surface is in 15m/min, ultrasound
The long feed speed control of wave dedicated tool is in 0.2mm；
(8) after completion of processing, ultrasonic equipment current value is transferred to 0.5A hereinafter, closing ultrasonic equipment switch.
Claims (1)
1. a kind of high-strength titanium alloy pipes case hardening process, specifically used lathe, frequency are 30KHz supersonic generator, surpass
Sound surface processing device and ultrasonic wave processing dedicated tool use ultrasonic impact processing technology to high-strength titanium alloy pipes surface
It is hardened, which comprises the steps of:
1) ultrasonic wave processing dedicated tool is mounted on the knife rest of lathe；
2) cable for connecting supersonic generator, ultrasonic surface processing unit (plant) and ultrasonic wave processing dedicated tool is connected；
3) high-strength titanium alloy pipes are clamped in lathe spindle, high-strength titanium alloy pipes are carrying out ultrasonic surface hardening processing
Before need to meet following requirement:
A) straightness :≤1mm/m
B) external diameter circularity :≤0.05mm
C) outer diameter tolerance :≤0.1mm
D) surface roughness: Ra0.8~3.2 μm
E) ultrasonic wave processing surplus: 0.005~0.06mm；
4) tool position is adjusted, center and the tubing centre-height deviation≤0.5mm of cutter, and center cutter and tube surfaces are made
Contact and apply to tubing the pressure of 30~300kg；
5) ultrasonic equipment, adjustment ultrasonic device current value to 0.8A~1.2A are opened；
6) start lathe, adjust lathe revolving speed, the wire velocity control for rotating titanium alloy pipe outer surface in 10~20m/min,
The long feed speed control of ultrasonic wave dedicated tool is in 0.15~0.3mm；
7) ultrasonic equipment current value is transferred to 0.5A hereinafter, closing ultrasonic equipment switch by completion of processing；
8) high-strength titanium alloy pipes surface is tested, the surface roughness value of tubing reaches Ra0.4 hereinafter, hardness improves
25% or more, wearability significantly improves；Or automatic testing equipment is installed on lathe, hardness or roughness test knot are shown on the spot
Fruit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711112604.5A CN109778091A (en) | 2017-11-13 | 2017-11-13 | A kind of high-strength titanium alloy pipes case hardening process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711112604.5A CN109778091A (en) | 2017-11-13 | 2017-11-13 | A kind of high-strength titanium alloy pipes case hardening process |
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| Publication Number | Publication Date |
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| CN109778091A true CN109778091A (en) | 2019-05-21 |
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| CN201711112604.5A Pending CN109778091A (en) | 2017-11-13 | 2017-11-13 | A kind of high-strength titanium alloy pipes case hardening process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110666454A (en) * | 2019-09-29 | 2020-01-10 | 江苏纽麦托钛业有限公司 | High-strength small-diameter titanium alloy pipe for orthopedics department |
-
2017
- 2017-11-13 CN CN201711112604.5A patent/CN109778091A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110666454A (en) * | 2019-09-29 | 2020-01-10 | 江苏纽麦托钛业有限公司 | High-strength small-diameter titanium alloy pipe for orthopedics department |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190521 |