CN1453387A - Surface electrospark discharge method with graphite electrode to reinforce titanium alloy material - Google Patents
Surface electrospark discharge method with graphite electrode to reinforce titanium alloy material Download PDFInfo
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- CN1453387A CN1453387A CN 03133313 CN03133313A CN1453387A CN 1453387 A CN1453387 A CN 1453387A CN 03133313 CN03133313 CN 03133313 CN 03133313 A CN03133313 A CN 03133313A CN 1453387 A CN1453387 A CN 1453387A
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Abstract
The present invention is surface electrospark discharge method with graphite electrode to reinforce titanium alloy material, and the graphite electrode is superior to available hard alloy material electrode, which is likely to damage the surface of processed part surface. Graphite material electrode is used in electrospark variable-frequency discharge and electrode vibration treatment to re-combine C ion and Ti ion. The graphite electrode has graphite content higher than 50 %, hardness less HS30, resistivity 10-25 microohm. m, no metal impurity content and proper sizes. The electromechanical processing parameters includes voltage 50-150 V, current 1-5 A, time 50-200 s/sq cm, discharge frequency greater than 2000 Hz and electrode vibration frequency 50-100 Hz.
Description
Affiliated technical field
The present invention relates to method,, carry out the method for surface Hardening Treatment particularly about part to titanium alloy material to metal surface enhanced processing.
Background technology
Present part to the titanium alloy material carries out surface Hardening Treatment and adopts RC impulse electricity, tension and relaxation formula electrical spark coating unit more, is electrode with the Hardmetal materials, and workpiece surface is carried out the molten molten processing of oozing that is coated with, though this device is simple in structure, reliable operation, cost is low, but current utilization rate and production efficiency are low, the working process parameter instability, form arc-over easily, the piece surface of often burning influences result of use, the situation that also has scrapped parts when serious, real is not ideal.
Summary of the invention
The objective of the invention is to provide a kind of at the part made from titanium alloy material, because matrix is soft, easily oxidation of surface, and adopt Graphite Electrodes discharge, generation electrical spark to make titanium alloy surface generate the processing method that the TiC strengthening phase reaches the surface modification purpose with Graphite Electrodes generation original position combination reaction, this method is the utilization rate of electrical height not only, and the piece surface strengthening point is intensive, even, and it is adjustable to strengthen controllable parameters, easy to operate, quality product height, wear-resisting durable.
The technical solution adopted for the present invention to solve the technical problems is: adopt discharge energy little, the discharging efficiency height, the electrospark impregnation machine that has controllable pulse formula discharging function and control automatically by programable device PLC, workpiece is connected on the negative pole of pulsed current, Graphite Electrodes is connected on the positive pole of pulsed current, carry out spark discharge, produce alloying again, wherein the degree of graphitization of Graphite Electrodes is greater than 50%, hardness is less than HS30, resistivity 10-25 μ Ω m, do not contain other metallic impurity, it is convenient that electrode size and shape guarantee to apply, reliably, machining voltage 50-150V, electric current 1-5A, time 50-200S/cm
2, discharge frequency is greater than 2000HZ, electrode vibration frequency 50-100HZ.
Graphite Electrodes is that Graphite Electrodes at titanium alloy surface the spark discharge reaction in has taken place, and has generated the new TiC phase with extreme hardness, has changed the surface property of titanium alloy to the mechanism of titanium alloy material electrospark impregnation.Detect (see figure 1) by the surperficial x-ray diffraction pattern that the sample strengthening layer is carried out.Show that strengthening surface exists three kinds of microtextures, i.e. TiC, C and Ti.Think that TiC is the strengthening phase that produces in strengthening process, Ti is the part of leaving over of mother metal, C does not participate in the deposition of electrode materials on mother metal of strengthening reaction, because Ti and C have stronger avidity under hot conditions, in the molten bath of point of discharge, chemical reaction has taken place and has generated TiC in graphite molecule and molten Ti in strengthening process.TiC has high hardness and is melted in the structure that produces densification on the mother metal.Be exactly on softer mother metal infiltration many grits, this material structure form and harder material are made into mill paid has good wear resistance.TiC is exactly the strengthening phase that the present invention realizes surface modification mutually.
The invention has the beneficial effects as follows: the piece surface strengthening point is intensive, even, surface strengthen layer can be up to more than the 20 μ m, the abrasion-resistant surface raising, antiwear property can be enhanced about more than once, frictional coefficient descends, long service life, and the surface Hardening Treatment expense is few, and easy to operate, the surface Hardening Treatment parameter is easy to control and reaches.
Description of drawings
Fig. 1 is the used TC1-0 sample coatings of an embodiment of the invention surface x-ray diffraction pattern,
Fig. 2 is embodiment of the invention TC1-0 sample surfaces stereoscan photograph X100,
Fig. 3 is the stereoscan photograph X1000 of embodiment of the invention TC1-0 sample in cross section,
Fig. 4 is the energy spectrum composition analysis of black area, embodiment of the invention TC1-0 sample coatings surface,
Fig. 5 is the energy spectrum composition analysis of embodiment of the invention TC1-0 sample coatings surface gray area,
Fig. 6 is the energy spectrum composition analysis in white clear zone, embodiment of the invention TC1-0 sample coatings surface,
Fig. 7 is the energy spectrum composition analysis of embodiment of the invention TC1-0 sample coatings cross section bright layer,
Fig. 8 is the energy spectrum composition analysis of embodiment of the invention TC1-0 sample coatings cross section matrix.
Embodiment
The inventive method is to adopt a kind of discharge energy little, the discharging efficiency height, has the controllable pulse discharging function, the electrospark impregnation machine of complete machine being controlled automatically by programable device PLC, surfaceness is not more than Ra3.2, any surface finish, dry, the work piece of no dirt is connected on the negative pole of pulsed current, Graphite Electrodes is connected on the positive pole of pulsed current, constitute discharge loop, carry out spark discharge, make graphite and Ti that combination reaction take place, produced the TiC strengthening phase, Graphite Electrodes in the method: degree of graphitization is greater than 50%, hardness is less than HS30, resistivity 10-25 μ Ω m does not contain other metallic impurity, and it is convenient that electrode size and shape can guarantee to apply, reliably; Dynamo-electric parameter is: machining voltage 50-150V, processing electric current 1-5A, process period 50-200S/cm
2, process discharge frequency greater than 2000HZ, electrode vibration frequency 50-100HZ.
It is electrode that the embodiment electrode materials is selected production domesticization graphite by above-mentioned requirements, and the titanium alloy material material samples is selected TC1,
Its chemical ingredients is:
Element al Mn Fe C Si Ti
Content % 1.0-2.5 0.7-2.0 0.3 0.1 0.15 surpluses
Testing installation adopts LM-1A type electrospark impregnation machine.
Form electrode and workpiece discharge loop by the pulse power man-hour when adding, electrode connects positive pole, and workpiece connects negative pole.The discharge energy size is controlled by pulsewidth, connect power supply after, PLC brings into operation, prolong 3 seconds after PLC delivery port rly. PYO connect, vibration head begins vibration, prolonged for 1 second again after rly. RY1 connect, the pulse power is connected.When reached the time of parameter setting process period, processing finished automatically, and at first the turn-off pulse power supply disconnects the vibration head power supply again after 1 second, reports to the police simultaneously.Such control process has been avoided the burn of part.
Test parameter:
Voltage: 85V
Power tube number: 1,2
Accurate (shelves) 4,5,6 of processing rule
Molten time: 100S, 120S, the 140S of being coated with
Claims (1)
1, with the method for Graphite Electrodes to titanium alloy material electric spark on surface discharge intensive treatment, it is characterized in that adopting the electrospark impregnation machine of controlling automatically by programmable logic controller PLC that workpiece surface is carried out intensive treatment, processed part is connected on the negative pole of pulsed current, Graphite Electrodes is connected on the pulsed current positive pole, carry out spark discharge, produce electrical spark original position combination reaction, wherein the degree of graphitization of Graphite Electrodes is greater than 50%, hardness is less than HS30, resistivity 10-25 μ Ω m, do not contain other metallic impurity, electrode size and shape guarantee easy to operate, reliably, its processing parameter: voltage 50-150V, electric current 1-5A, time 50-200S/cm
2, discharge frequency is greater than 2000HZ, electrode vibration frequency 50-100HZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133313 CN1219908C (en) | 2003-05-19 | 2003-05-19 | Surface electrospark discharge method with graphite electrode to reinforce titanium alloy material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133313 CN1219908C (en) | 2003-05-19 | 2003-05-19 | Surface electrospark discharge method with graphite electrode to reinforce titanium alloy material |
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| Publication Number | Publication Date |
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| CN1453387A true CN1453387A (en) | 2003-11-05 |
| CN1219908C CN1219908C (en) | 2005-09-21 |
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| CN 03133313 Expired - Lifetime CN1219908C (en) | 2003-05-19 | 2003-05-19 | Surface electrospark discharge method with graphite electrode to reinforce titanium alloy material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031509A (en) * | 2011-10-08 | 2013-04-10 | 中国农业机械化科学研究院 | Method for strengthening surface of titanium alloy |
| CN105177479A (en) * | 2015-07-31 | 2015-12-23 | 辽宁工业大学 | Photoelectric pulse composite processing method of novel composite microstructure of Ti-6Al-4V alloy |
| CN105543842A (en) * | 2016-01-07 | 2016-05-04 | 浙江申吉钛业股份有限公司 | Wear-resistant and high-temperature-resistant coating formed on surface of titanium alloy and implementation method of coating |
| CN108193166A (en) * | 2016-12-08 | 2018-06-22 | 沈阳金研激光再制造技术开发有限公司 | Titanium alloy surface micro-arc carburization method |
-
2003
- 2003-05-19 CN CN 03133313 patent/CN1219908C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031509A (en) * | 2011-10-08 | 2013-04-10 | 中国农业机械化科学研究院 | Method for strengthening surface of titanium alloy |
| CN105177479A (en) * | 2015-07-31 | 2015-12-23 | 辽宁工业大学 | Photoelectric pulse composite processing method of novel composite microstructure of Ti-6Al-4V alloy |
| CN105543842A (en) * | 2016-01-07 | 2016-05-04 | 浙江申吉钛业股份有限公司 | Wear-resistant and high-temperature-resistant coating formed on surface of titanium alloy and implementation method of coating |
| CN105543842B (en) * | 2016-01-07 | 2019-01-08 | 浙江申吉钛业股份有限公司 | Wear-resisting-the high-temperaure coating and its implementation that titanium alloy surface is formed |
| CN108193166A (en) * | 2016-12-08 | 2018-06-22 | 沈阳金研激光再制造技术开发有限公司 | Titanium alloy surface micro-arc carburization method |
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| Publication number | Publication date |
|---|---|
| CN1219908C (en) | 2005-09-21 |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: AECC SHENYANG LIMING AERO-ENGINE Co.,Ltd. Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Aecc Shenyang Liming Aero Engine Co., Ltd. |
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Granted publication date: 20050921 |