CN105525243A - Surface hardening method for high-strength titanium alloy tube - Google Patents
Surface hardening method for high-strength titanium alloy tube Download PDFInfo
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- CN105525243A CN105525243A CN201510994326.5A CN201510994326A CN105525243A CN 105525243 A CN105525243 A CN 105525243A CN 201510994326 A CN201510994326 A CN 201510994326A CN 105525243 A CN105525243 A CN 105525243A
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- ultrasonic
- titanium alloy
- lathe
- processing
- strength titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
Abstract
The invention discloses an outer surface hardening method for a high-strength titanium alloy tube, and belongs to the technical field of material processing. The surface hardening method specifically comprises the following steps: mounting a special tool for ultrasonic processing to a tool rest of a lathe; using an ultrasonic generator with frequency of 30KHz to carry out ultrasonic-impact hardening processing on the outer surface of the titanium alloy tube; regulating the rotation speed of the lathe, controlling linear speed of the rotation of the outer surface of the titanium alloy tube to be 10-20m/min, and controlling longitudinal feeding speed of the ultrasonic special tool to be 0.15-0.3mm; and after completing processing, regulating a current value of ultrasonic equipment to be lower than 0.5A, and switching off the ultrasonic equipment. According to the outer surface hardening method provided by the invention, process parameters for carrying out surface hardening and processing on the high-strength titanium alloy tube are controlled by adopting an ultrasonic processing mode on the lathe, and operation is carried out according to the process, so that the outer surface of the high-strength titanium alloy tube obtains optimal ultrasonic hardening effect. The process can effectively improve the hardness and the wear resistance of the outer surface of the titanium alloy tube, so that the surface roughness is reduced.
Description
Technical field
The invention belongs to materials processing technology field, particularly a kind of outside surface method for curing of high-strength titanium alloy pipes.Be specifically related to a kind of outside surface ultrasonic impact sclerosis complete processing of titanium alloy pipe, this technique effectively can improve outside surface hardness and the wear resistance of titanium alloy pipe, reduces surfaceness.
Background technology
High-strength titanium alloy pipes has that intensity is high, density is low, the feature such as solidity to corrosion and good heat resistance, is the ideal material of the field key positions such as Aeronautics and Astronautics, oil, chemical industry, boats and ships.But because the hardness of titanium alloy is lower, frictional coefficient is large, the shortcoming such as wear no resistance, and have impact on its work-ing life and range of application to a certain extent.Adopt suitable Case hardening techniques, under the prerequisite not reducing matrix mechanical property, improve the surface hardness of titanium alloy pipe, be improve its surface abrasion resistance and the effective way in work-ing life, the range of application of high-strength titanium alloy pipes can be expanded.Therefore, correlation engineering technician has carried out extensive research to titanium alloy surface hardening technique.
At present metallic surface method for curing is almost all applied in the surface treatment of titanium alloy, has openly reported that visible comprises thermo-chemical treatment (gas nitriding, ion nitriding), shot blasting on surface process, ion implantation, surface anodization process, surface-coating technology, vapor deposition film technology, electrospark machining, laser processing etc. for the surface-hardening treatment method of titanium alloy.
The method of gas nitriding or ion nitriding, although titanium alloy surface hardness can be improved, but due in order to improve nitriding efficiency, nitriding medium need contain ammonia or nitrogen-hydrogen mixed gas, and nitridation process must carry out under higher high temperature, the hydrogen in these penetration enhancers of nitriding very easily causes titanium alloy to produce hydrogen embrittlement because inhaling hydrogen.Therefore, in nitriding process, do not allow the atmosphere of hydrogen to exist, cause efficiency of nitridation extremely low, nitride layer depth and hardness are difficult to reach service requirements.
Shot peening reaches the object of surface strengthening by making titanium alloy surface produce plastic deformation, but the surfaceness that shot-peening can make the titanium alloy pipe of rolling bright and clean increases, although improve the wear resistance of self like this, easily cause other parts matched with this titanium alloy member to produce and wear and tear.
The major advantage of ion implantation is that rete and matrix are combined, and antistripping ability is strong, and injection process does not require to raise substrate temperature, thus can holding workpiece geometric accuracy.But ion implantation efficiency is low, and existing ion implantation device is not suitable for carrying out surface treatment to the tubing of length more than 3 meters.
Surface anodization process is the conventional approach improving titanium alloy solidity to corrosion and wear resistance, but because titanium alloy pipe is in processing and heat treatment process, surface easily forms dense oxidation film, must effectively remove in anodic oxidation, otherwise have a strong impact on anodic oxidation film quality, but its cleaning difficulty is larger.In addition, no matter be remove original oxide layer, or anode oxidation process, all need to employ a large amount of acid, alkali and number of chemical reagent, considerably increase subsequent wastewater treatment cost, but also be difficult to reach more and more harsher environmental protection standard.
Surface-coating technology is the effective ways improving titanium alloy oxidation-resistance, but if for improving titanium alloy surface hardness and wear resistance, the easy generation of this hard coat and titanium alloy substrate is ftractureed and peeled off.
Vapour deposition process prepares diamond like carbon film at titanium alloy surface, can improve surface hardness and the rub resistance of titanium alloy.But when in film, titanium content is more than 9%, the hardness of film will decline, and film and basal body binding force limited.
Laser melting coating processing is that the powdered alloys such as CoCrW are formed cladding layer at titanium alloy surface, thus improve titanium alloy surface hardness and wear resistance, but the homogeneity of rete, compactness and crack problem not yet solve, and this method is difficult to realize all standing on large length titanium alloy pipe surface.
Differential arc oxidation (MAO) technology directly matrix metal is become oxide ceramics by micro-arc discharge district instantaneous high-temperature high-pressure sinter, and obtain thicker oxide film, the hardness of film is high and be combined well with metallic matrix, improve the performances such as the resistance to wearing of titanium alloy surface, anticorrosive, heat shock resistance, there is good application prospect.
Ultrasonic impact processing utilizes powerful ultrasonic wave to promote percussion tool to impact metal object surface with the frequency of more than 10,000 times per second, metal surface is made to produce larger compactibility distortion, ultrasonic impact position is strengthened, thus the intensity of matallic surface layer and hardness are all increased significantly, reduce workpiece surface roughness simultaneously.Chinese patent CN101503755, CN101502881 etc. provide only ultrasonic metallic surface processing device, do not provide concrete complete processing.Chinese patent CN1013111972A, CN103072049A, CN103084648A, CN103084634A, CN103084608A each provide and adopt Ultrasonic Machining to 5 kinds of material metallic surface complete processings such as carbon steel, stainless steel, cast iron, copper, aluminium at lathe, cylindrical grinder, planer, milling machine, boring machine.
So far, the relevant complete processing report adopting ultrasonic impact working method to improve titanium alloy surface hardness is had no.
Summary of the invention
The object of this invention is to provide a kind of high-strength titanium alloy pipes case hardening process, concrete use lathe, frequency are 30KHz ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool, ultrasonic impact complete processing is adopted to harden to high-strength titanium alloy pipes surface, it is characterized in that, comprise the steps:
1) ultrasonic machining dedicated tool is arranged on the knife rest of lathe;
2) cable connecting ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool is connected;
3) high-strength titanium alloy pipes is clamped in lathe spindle, high-strength titanium alloy pipes needed to meet following requirement before carrying out ultrasonic surface sclerosis processing:
A) linearity :≤1mm/m
B) external diameter circularity :≤0.05mm
C) outer diameter tolerance :≤0.1mm
D) surfaceness: Ra0.8 ~ 3.2 μm
E) ultrasonic machining surplus: 0.005 ~ 0.06mm;
4) adjust tool position, make center and the tubing centre-height deviation≤± 0.5mm of cutter, and center cutter contacts with tube surfaces and tubing applied to the pressure of 30 ~ 300kg;
5) open ultrasonic equipment, adjustment ultrasonic device current value is to 0.8A ~ 1.2A;
6) start lathe, adjustment lathe rotating speed, make wire velocity control that titanium alloy pipe outside surface rotates at 10 ~ 20m/min, the long feed speed control of ultrasonic wave dedicated tool is at 0.15 ~ 0.3mm;
7) completion of processing, is transferred to below 0.5A by ultrasonic equipment current value, closes ultrasonic equipment switch.
8) test high-strength titanium alloy pipes surface, the surface roughness value of tubing reaches below Ra0.4, and hardness improves more than 25%, and wear resistance significantly improves; Or on lathe, automatic testing equipment is installed, show hardness or roughness test result then and there.
The invention has the beneficial effects as follows to provide adopts ultrasonic machining mode to carry out the processing parameter of surface hardening processing to high-strength titanium alloy pipes on lathe, by this technological operation, high-strength titanium alloy pipes outside surface can be made to obtain surface roughness value and reach below Ra0.4, hardness improves the ultrasonic wave hardening effect of more than 25%.
Embodiment
The invention provides a kind of high-strength titanium alloy pipes case hardening process, concrete use lathe, frequency are 30KHz ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool, ultrasonic impact complete processing is adopted to harden to high-strength titanium alloy pipes surface, ~ for TC10 titanium alloy pipe, it is specific as follows that its ultrasonic surface impacts complete processing:
(1) this ultrasonic impact complete processing is used the ultrasonic generator that equipment comprises lathe, output frequency is 30KHz, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool;
(2) ultrasonic machining dedicated tool is arranged on the knife rest of lathe;
(3) cable connecting ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool is connected;
(4) the TC10 titanium alloy pipe of Φ 52 × Φ 40 × 3000mm is clamped in lathe spindle, consistent when the mode that is installed and turnery processing.In order to prevent tubing flexural deformation under tool pressure, movable support should be installed and used.TC10 titanium alloy pipe needed to meet following requirement before carrying out ultrasonic surface sclerosis processing:
F) linearity :≤1mm/m
G) external diameter circularity :≤0.05mm
H) outer diameter tolerance :≤0.1mm
I) surfaceness: Ra0.8 ~ 1.6 μm
J) ultrasonic machining surplus: 0.01 ~ 0.03mm
(5) adjust tool position, make center and the tubing centre-height deviation≤± 0.5mm of cutter, and center cutter contacts with tube surfaces and tubing applied to the pressure of 30 ~ 300kg;
(6) open ultrasonic equipment, adjustment ultrasonic device current value is to 1.2A;
(7) start lathe, adjustment lathe rotating speed, make wire velocity control that titanium alloy pipe outside surface rotates at 15m/min, the long feed speed control of ultrasonic wave dedicated tool is at 0.2mm;
(8) after completion of processing, ultrasonic equipment current value is transferred to below 0.5A, closes ultrasonic equipment switch.
Claims (1)
1. a high-strength titanium alloy pipes case hardening process, concrete use lathe, frequency are 30KHz ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool, ultrasonic impact complete processing is adopted to harden to high-strength titanium alloy pipes surface, it is characterized in that, comprise the steps:
1) ultrasonic machining dedicated tool is arranged on the knife rest of lathe;
2) cable connecting ultrasonic generator, ultrasonic surface processing unit (plant) and ultrasonic machining dedicated tool is connected;
3) high-strength titanium alloy pipes is clamped in lathe spindle, high-strength titanium alloy pipes needed to meet following requirement before carrying out ultrasonic surface sclerosis processing:
A) linearity :≤1mm/m
B) external diameter circularity :≤0.05mm
C) outer diameter tolerance :≤0.1mm
D) surfaceness: Ra0.8 ~ 3.2 μm
E) ultrasonic machining surplus: 0.005 ~ 0.06mm;
4) adjust tool position, make center and the tubing centre-height deviation≤± 0.5mm of cutter, and center cutter contacts with tube surfaces and tubing applied to the pressure of 30 ~ 300kg;
5) open ultrasonic equipment, adjustment ultrasonic device current value is to 0.8A ~ 1.2A;
6) start lathe, adjustment lathe rotating speed, make wire velocity control that titanium alloy pipe outside surface rotates at 10 ~ 20m/min, the long feed speed control of ultrasonic wave dedicated tool is at 0.15 ~ 0.3mm;
7) completion of processing, is transferred to below 0.5A by ultrasonic equipment current value, closes ultrasonic equipment switch;
8) test high-strength titanium alloy pipes surface, the surface roughness value of tubing reaches below Ra0.4, and hardness improves more than 25%, and wear resistance significantly improves; Or on lathe, automatic testing equipment is installed, show hardness or roughness test result then and there.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510994326.5A CN105525243B (en) | 2015-12-25 | 2015-12-25 | A kind of high-strength titanium alloy pipes case hardening process |
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| CN201510994326.5A CN105525243B (en) | 2015-12-25 | 2015-12-25 | A kind of high-strength titanium alloy pipes case hardening process |
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| CN105525243A true CN105525243A (en) | 2016-04-27 |
| CN105525243B CN105525243B (en) | 2017-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109454241A (en) * | 2018-11-02 | 2019-03-12 | 厦门虹鹭钨钼工业有限公司 | A kind of tungsten/molybdenum product ultrasonic surface processing method |
Citations (5)
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|---|---|---|---|---|
| US5145530A (en) * | 1989-05-18 | 1992-09-08 | Cassady William E | Method of surface hardening titanium and other metals |
| JPH0726356A (en) * | 1993-07-07 | 1995-01-27 | Kobe Steel Ltd | Treatment of heat exchanger tube for making its surface hydrophilic |
| CN101624691A (en) * | 2008-07-10 | 2010-01-13 | 北京有色金属研究总院 | Surface nanocrystallization method for titanium alloy material |
| CN102626852A (en) * | 2012-04-28 | 2012-08-08 | 山东华云机电科技有限公司 | Supersonic machining method for conical surface of engine valve retainer |
| CN103084634A (en) * | 2013-01-28 | 2013-05-08 | 赵显华 | Ultrasonic metal surface machining process for milling machine |
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2015
- 2015-12-25 CN CN201510994326.5A patent/CN105525243B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5145530A (en) * | 1989-05-18 | 1992-09-08 | Cassady William E | Method of surface hardening titanium and other metals |
| JPH0726356A (en) * | 1993-07-07 | 1995-01-27 | Kobe Steel Ltd | Treatment of heat exchanger tube for making its surface hydrophilic |
| CN101624691A (en) * | 2008-07-10 | 2010-01-13 | 北京有色金属研究总院 | Surface nanocrystallization method for titanium alloy material |
| CN102626852A (en) * | 2012-04-28 | 2012-08-08 | 山东华云机电科技有限公司 | Supersonic machining method for conical surface of engine valve retainer |
| CN103084634A (en) * | 2013-01-28 | 2013-05-08 | 赵显华 | Ultrasonic metal surface machining process for milling machine |
Non-Patent Citations (1)
| Title |
|---|
| 苏伟: "《模具概论》", 30 April 2006, 人民邮电出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109454241A (en) * | 2018-11-02 | 2019-03-12 | 厦门虹鹭钨钼工业有限公司 | A kind of tungsten/molybdenum product ultrasonic surface processing method |
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Effective date of registration: 20190829 Address after: 101407 Beijing city Huairou District Yanqi Economic Development Zone Branch Hing Street No. 11 Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088 Beijing city Xicheng District Xinjiekou Avenue No. 2 Patentee before: General Research Institute for Nonferrous Metals |
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