Laser frit apply (solder) the technology produces medium application in aviation engine

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One, apply of overview laser frit (solder) technical characteristic is: Can realize the accurate control of hot input, solder rate is high, cooling rate is rapid, hot distortion is small, it is good that ply, composition and attenuant rate can charge a sex, can acquire an organization the layer of fusion welding piling apply with compact, superior performance, can save high-powered data. Additional, can enclothe on solid common now material high-powered (wear-resisting, high temperature resistant, be able to bear or endure corrode) v layer, and laser beam machining is machined to do not have a contact, without treatment inertial, and solder once parameter is affirmatory, solder quality assures easily, solder reliability is high, reason implements automation easily, accord with the development trend of modern production, in economically go up with apply layer quality also the v of excel tradition and thermal spraying craft. Laser frit apply (solder) the face that the technology can use at high temperature alloy, titanium alloy, magnesium alloy and alloy steel spare parts is local aggrandizement, repair spare parts wears away the surface, remove a part cast blemish, heal spare parts enlists in army the inchoate hot crack of generation. At present world developed country uses technology of laser beam machining extensively at aviation engine make and repair process. Be in China, since 1990 technology of laser frit apply begins to apply at aviation engine to produce, basically solve apex of lamina of rotor of turbine of some aviation engine to grind at that time short receive chief problem, through development of more than 10 years, technology of laser frit apply has been used on the aggrandizement of all sorts of aviation engine lamina and component and rehabilitate. 2, the laser frit apply of alloy of nickel radical high temperature (solder) alloy of nickel radical high temperature is a kind of uses extensively data on aviation engine, increase as content of Al, Ti, 2 aggrandizement photograph Ni3(Al, number of Ti) concentration percentage by volume increases, the high temperature intensity of alloy increases. Contemporary the component heating up end such as lamina of high-powered aviation engine turbine, guider is by tall Al + Ti alloy of nickel radical high temperature is made, if У of 6 of С of Rene125, DZ22, DZ125, Ж , K24 reachs K418. When components of these high temperature alloy are made, chose admirable high temperature resistant alloy material and advanced casting are caused model craft, manufacturing cost tall, cost is high. However, when these components enlist in army, suffer high temperature, high pressure and corrosive effect burning gas, often appear all sorts of inchoate injury, affect the safety of engine and performance badly. The component face-lifting reoccupy that discards as useless those because of inchoate injury for this is the thing that has appeal extremely. However, because alloy of high temperature of nickel radical of tall Al + Ti contains many Ni 3 (Al, ti) photograph, hot crack sensitivity is very tall, soldering and easy generation is caky in the process after solder crackle of crackle, crystal boundary liquefaction and strain ageing crackle, this brought huge difficulty to fusion welding. Come more than 10 years lab of modified of surface of laser of institute of metal of the Chinese Academy of Sciences is below support of project of national emphasis war industry, undertook in the respect of laser frit apply of high temperature alloy research and project apply comparative much fundamental experimentation. The experiment makes clear, nickel of tall Al + Ti base the laser fusion welding that exceeds alloy and frit apply, it is the repair system project with craft very strong sex, involve the heat treatment of laser irradiation around and finishing, stimulate beam of light can control irradiation and radiation means, the surface besmears beforehand material and fill material, of antirust protection and control of base material temperature and repair quality detect performance assessment. A few not weldable component, through local solder to change technology and get repair. The multinomial country of laser fusion welding and frit apply technology invents patent, for our country new-style aviation engine and abroad imported aviation engine development, production and repair respect to solve a lot of great and crucial problems. The article serves as the purpose of cast a brick to attract jade-offer a few commonplace remarks by way of introduction so that others may come up with valuable opinions, list main laser frit apply uses the job as follows: 1.

The founding of laser profile modeling of blade apex receives lamina of class of I of turbine of high pressure of engine of long rehabilitate aviation, in high temperature high speed working requirement falls, heat expands stretchy shake with onflow and outside the reason such as the deposit burning ash that seals Yan Huan to go up all can cause blade and the contact that seal Yan Huan to wear away, bring about blade apex to grind thereby short. According to computation, every grind blade apex short 0.

1 Mm, light air temperature to spend ℃ of elevatory 10. Some is new-style push the blade apex that compares machine of engine test and verify high to be ground short 0.

7 ～ 1.

2 Mm left and right sides, temperature rise amounts to left and right sides of 100 ℃ , cause blade to reach its to heat up upright component fire damage from this, the dynamical performance of engine drops, change new lamina not only the price is obtained in time costly and very hard. It is OK to use technology of founding of laser profile modeling will grind short Xie Jian to receive long. Graph 1 receive long sketch map for founding of blade laser profile modeling. Used technology of founding of laser profile modeling to solve a lot of technology difficult problem successfully. For example, will grind short high pressure one class lamina receives 3mm of ～ of long 2, ensured the nation is major in time successful trial run amounts to the project mark; makes opportunity for combat of T700 Hei Ying area of ablation of apex of lamina of one class rotor is out of shape get repair; be in navy one class goes to the WPX of battle 2 class and leaf of WPX2 class turbine.

6mm, already flew now 200h above. Arrive at present, already realized batch to receive long rehabilitate. 2.

The aggrandizement of laser apply layer of face of damp of blade coronal ministry and repair aviation engine take coronal rotor blade below the operating mode that interlocking face lights gas and high speed roll to move in high temperature, can happen serious high temperature is corroded and small brace up wear away make assemble close together lamina to happen to become loose badly originally, cause those who light the leakage that enrage oil and lamina to swing from this, make blade root ministry is reached by very great contortion stress rupture, for this lamina interlocking face must bring to bear on corrosion protection is fought grind coating to come aggrandizement. The cobalt that uses sex of rare land reform of laser frit apply base alloyed powder end can realize damp extent aggrandizement and restore configuration of tatty damp face. Graph 2 for apply of frit of laser of face of damp of low-pressure turbine lamina the typical form appearance of cobalt radical coating is reached microscopical hardness profile. The face of foliaceous coronal damp that uses this technology to be engine of 8000 homebred and new-style aviation did processing of layer of stiff dough apply. In addition, the damp face page that a variety of type engine such as WSXX, WPXXB, WPXXF, WPXX and WPX take coronal blade also used this technology to undertake exterior aggrandizement is handled, obtained well-content effect; navy to use WPX series motor the abrasion of face of damp of coronal of flat look of lamina of one class turbine decreases feet out of tolerance, all obtain successful rehabilitate through using this technology. 3.

The laser of blemish of blade three dimensional space shows calculus to rebuild the hot crack on turbine lamina and oriented lamina, cast blemish to wait be in irregular stereo space, receive with founding of apex laser profile modeling grow and plane of this kind of 2 dimension machines aggrandizement of layer of apply of damp face laser to be compared, taller to the requirement of craft of laser beam machining. Laser shows calculus solder is to use laser powder multilayer the principle of frit apply, use the Nd of small-power: YAG stimulates beam of light to press optimize method for many times irradiation makes pulverous body fused and caky, metallurgy is accumulated between path and path, layer and layer, till cram is whole area of three dimensional space. A large founding space that has three-dimensional border is formed by a lot of little frit apply places, be like an integral process. With 2 dimension planar laser frit apply differs, the laser of three dimensional space shows calculus solder undertake below tie circumstance, can be being regarded is laser frit apply and the complex process that laser solders. The main characteristic of this craft is: Quantity of heat of input base material is little, can obtain internal stress the founding with interface of union of metallurgy of the smallest, space, least blemish rebuilds layer. It is the tall Al + Ti with hot crack very tall sensitivity when base material when material of alloy of nickel radical high temperature, laser shows the generation that calculus solder can decrease effectively and avoids flaw. Graph 6 У of the 3 С that it is Ж laser of three dimensional space of lamina of turbine of alloy high pressure is microscopical founding nickel base alloy organizes form appearance. Use laser to show rehabilitate of ground of success of calculus solder technology crackle of apex of lamina of turbine of high pressure of engine of some entrance aviation, the lamina of repair passed engine ground stage to wear long-term test-drive assessment, already entered batch rehabilitate phase at present. Additional, integral guider casts blemish is a special a Gordian knot, use rehabilitate of ground of this technology success some is new-style rise guider of whole of engine K6C alloy continuously cast of essence of life more than 10. 3, titanium alloy solder of laser frit apply is high-powered the titanium alloy of aviation engine use increasing, but titanium alloy is mixed as a result of its wearability fight mechanical exhaustion the gender is poorer, and easy generation wears away with fatigue crackle. The BT20 alloy of some plane is anti-icing housing wall cooperates with its between happen small brace up wear away, bring about its to cooperate type of step of sealing surface happening to wear away groove and invalidation, if pursue,4a place is shown. Employ titanium alloy solder of apply of frit of tall pure laser technique of one a complete set of, can make a wall large only 2.

The housing of 0mm gets notting have is out of shape repair, its fill solder area is united in wedlock for metallurgy, the organization is even and compact, if pursue,4b place is shown. Technology of solder of apply of frit of tall pure laser applies titanium alloy already successfully on the reproducing of aviation motor component, at present already casing of intermediary of some entrance engine counts repair, anti-icing housing and cup form hundreds. 4, magnesium alloy laser frit apply is well-known, of magnesium alloy solder crucial question is easy oxidation, aerification, hot crack is mixed be out of shape big (coefficient of expansion is big) etc, it is OK to use the technology such as argon arc solder undertake to preform of magnesium alloy wool solder fills, but the finished product that reachs the designated position to already was being machined with repair solder filling rehabilitate is very difficult, often cannot come true. Research uses pulse laser beforehand fast solder filling method can realize buy and electric spark workpiece is not had be out of shape repair. Aviation engine magnesium alloy the main injury invalidation in enlist in army is electrochemistry is corroded, if housing is propped up before WPX, material is ZM2 magnesium alloy, in all with spacer of close solid bolt osculatory area all produced couple to corrode hole. The blemish that magnesium alloy is casting production to happen constantly is loose, be mingled with and hot crack. The finished product of casing of accessory of magnesium alloy of ZM5 of Kunlun date engine that our country develops existence is cast loose cause dozen of oil that press leakage. The organization after using rehabilitate of law of laser frit apply is compact, do not have a He Xianwei blemish, as good as matrix metallurgy union, if pursue,5 are shown. 5, epilogue as laser frit apply (solder) further progress of the technology, and what aviation manufacturing industry spends to its acknowledge is ceaseless rise, technology of solder of laser frit apply is sure to be in aviation engine is made and wider application receives in reproducing. CNC Milling