Oscillatory processing technology produces medium application in turbine

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Summary: Vibration eliminates leftover stress is a kind of craft that adjusts leftover stress with mechanical method, the main characteristic of this craft is cost low, efficiency is tall, feebleminded bad news, manufacturing cycle is short, clean production, low noise, suitable scope is wide and be used extensively. The article introduced this technology to wait for the applied circumstance in the component in turbine. Keyword: Technology of oscillatory effectiveness for a given period of time; Turbine component; Since applying 1 introductive vibration to handle a technology to be introduced by our country from 70 time, it is accepted for more and more people place not only, and delectable result was obtained in the branch such as machine tool, heavy machinery, project machine, aviation, metallurgy, chemical industry, the development that is mechanical industry had bigger and bigger effect. Oscillatory processing technology not only the cost as a result of it low, specific power consumption low, efficiency is tall, and more the simple, cleanness that produces cycle weak point, free from contamination manufactures the technology as a result of it, overcame the problem such as the exterior oxidation that craft of certain heat treatment can not cast off, decarbonization, thereby Mi filled natural effectiveness for a given period of time and the inadequacy that heat up effectiveness for a given period of time, accordingly, processing technology was in vibration to receive wide application domestic and internationally. Vibration handles a technology to prove through a large number of experiments, can make solder leftover stress, distributing especially extremely inhomogenous solder structural dimension, the maintenance that raised component part precision thereby quality, especially relatively apparent to the processing effect of cast. Vibration handles technical principle, it is with machinery oscillatory means moves his stress to bring to bear on to go up at component part, when the overlay of leftover stress photograph when this kind of additional stress and component part interior, its after total stress is achieved or more than one destiny is worth, at this moment, be in the place that component part stress centers, succumb as a result of what stress exceeded material intensity and happened microcosmic be out of shape with macroscopical plasticity, make the peak value of leftover stress is reduced, adjusted stress of component part remains distributing, achieved the goal of leftover stress leveling thereby. Vibration handles technical mechanism, domestic and international scholar from macroscopical, microcosmic, mechanical, of material wait for different point of view, use a wrong theory, flexibility to be out of shape academic, plasticity is out of shape academic, inside bad news theory waited theory a moment to undertake much research and experiment make clear, the essence of oscillatory processing technology is a stretch meet an emergency in keeping existence data can be passed local or microcosmic plasticity is out of shape the process that tries to release gradually; If will look from micromechanism, criterion with the change of wrong substructure and its configuration is concerned, through increasing energy of vibration of crystal lattice atomic, and the crystal lattice atom that makes produce a fault is returned low a poor condition, this and heat treatment are through increasing crystal lattice atomic heats up kinetic energy, and the crystal lattice atom that makes produce a fault returns potential energy inferior little the mechanism of a poor condition is very similar; Of stress of the remains in the component part that causes by technology of oscillatory effectiveness for a given period of time flabby, it is model of small area of component part interior changes the result that whole adjusts; Because the existence of leftover stress behaves the characteristic that balances for whole, when local leftover stress peak value produces change, those who be sure to cause the leftover stress of component part interior is new distributing (leveling) ; Of leftover stress reduce add stress amplitude to concern with place, using the effectiveness for a given period of time below stress suitably, can achieve second hold the end that take exercise, and won't cause fatigue loss. Anyhow, to oscillatory processing technology the it is certain to although have,be known confine of this one objective fact is mixed difference, but it is since 50 time in industry of the spaceflight of foreign industry developed country, aviation, war industry, car, machinist job had won wide application. Home since since introducing vibration to handle a technology, received wide application in each domains not only, a lot of scholars and Scientists and Technologists, equivalent of the stability of the ability that eliminates leftover stress in the offset on actual component part, dimension, fatigue life undertook many experiment works if really, proved the feasibility of this craft. Oscillatory effectiveness for a given period of time also is known as revolution of craft of effectiveness for a given period of time. Room of vacuum of machine of experiment of dynamic balancing of ⑴ of example of application of technology of 2 oscillatory processing end introduced machine of the Asia's oldest at that time dynamic balancing experiment from abroad seventies, vacuum room is machined in home, vacuum room is 13 meters long, diameter 7 meters of section coil those who make solder structural cylindrical shell, asked to oscillatory processing undertakes after soldering by craft, use up to now, still maintain dimension precision. Room of vacuum of welder of ⑵ electron beam introduced welder of large electron beam from abroad 2001, vacuum room is machined in home, this vacuum room is solder structure, 7 meters long, tall 6.

3 rice, 5 meters wide, heft many tons 110, cent is 3 parts namely before, hind room and gate undertake oscillatory processing, be in advocate near welding line, use Xi'an to hand in the magnetism stress that develops jointly with haing steam greatly to distributing the leftover stress that instrument checked vibration to handle from beginning to end, among them the test of two welding line sees next tables as a result: The elimination of leftover stress is led amount to 50 ％ above. This vacuum room already put into production moves 3 years. Clapboard of type of annulus of clapboard of type of Nextpage ⑶ annulus is turbine noumenal an important part, it is the part that uses stationary guide vane, the steam that heat energy comprises in guide vane is changed into kinetic energy in the path, make turbine works. What annulus type clapboard uses is to solder structure, welding line overall length amounts to a few meters, to eliminate the leftover stress of the generation when soldering, the means that should use temper heat treatment commonly eliminates stress, the oxidation skin that undertakes cleared temper brings gush arenaceous working procedure even meanwhile. Next, the noumenon of clapboard and outer shroud solder with its among them lamina is different material, accordingly, differ as a result of two kinds of material in process of hot effectiveness for a given period of time, hot coefficient of expansion is different also, can produce new thermal stress. If use vibration to handle a technology to replace hot effectiveness for a given period of time, shortened not only production is periodic, reduced gush arenaceous process, reduced manufacturing cost, still overcame the undesirable effect that hot effectiveness for a given period of time brings to component part. Check a level according to what heat up effectiveness for a given period of time to annulus type clapboard, checked clapboard of 30 type paying annulus to be in around of craft of executive vibration effectiveness for a given period of time, the amount of the biggest change that end panel of annulus of inside and outside spurs is ＋ 3.

1mm ～ - 2.

Between 5mm, average change quantity is 0.

35mm. Quantity of the biggest change is the type clapboard of outer shroud diameter ± 3mm, average change quantity is 0.

7mm, all did not exceed a level and excel heats up effectiveness for a given period of time. In addition, used appearance of X ray stress to detect the stress of the around of oscillatory effectiveness for a given period of time near welding line of annulus type clapboard changes, used magnetism stress distributinging instrument to detect annulus type clapboard is oscillatory near welding line of inside and outside the stress of around of effectiveness for a given period of time distributings change, the test makes clear as a result, clear stress leveling result produced after oscillatory effectiveness for a given period of time. Current, the craft of oscillatory effectiveness for a given period of time of annulus type clapboard already replaced working procedure of craft of hot effectiveness for a given period of time to handle clapboard of hundreds type paying annulus, millions of managing production cost yuan. The action of ⑷ cylinder cylinder is include steam expand in cylinder acting, contain inside the crock nozzle, clapboard, packing, their a general designation is Jing Zi. Cylinder should bear of afore-mentioned spare partses self-prossessed the installation with conduit is tensile, the crock inside and outside when the job controls the other active force such as difference. As a result of working requirement different, cylinder is divided again for high pressure, middling pressure, low-pressure cylinder. Cylinder uses technology of oscillatory effectiveness for a given period of time, be confined to low-pressure crock and filling solder crock at present, because, low-pressure crock is more solder structure, and filling solder crock, just often apply filling solder when flaw discovered when finish machining, use hot effectiveness for a given period of time to eliminate filling solder stress, if arose to be out of shape cannot repair, using technology of oscillatory effectiveness for a given period of time is first-rate choice. The low pressure of empty cold aircrew that uses processing of craft of oscillatory effectiveness for a given period of time is below the following in the crock of half dimension stability detect result: Through above the test is seen as a result, 26 tons cylinder hefts after oscillatory effectiveness for a given period of time, through the shift of nearly 10 working procedure, its are main size variation is controlled in ± 12mm, and control standard is not more than 30mm. Its excel heats up effectiveness for a given period of time, hot effectiveness for a given period of time needs to use large heat treatment heat, heat source is used commonly gas, because temperature of the chamber of a stove or furnace is inhomogenous,often can make cylinder generation is out of shape newly; As a result of intensity reduce, generation of the meeting when cylinder is mobile is larger be out of shape; Specific power consumption is big, also go against clean production; Cost is high, production is periodic and longer. The water room of ⑸ condenser is in the heating power system of turbine group, condenser is to satisfy turbine to heat up the auxiliary equipment that labour circulates. Its action is to improve circular thermal efficiency, make the change that discharge steam is condensate, so that be used in the loop. By cooling pipe of classics of the room that drink water group hind pours out of cooling water via giving water room again, for this, requirement condenser should have better close sex and dimension stability. The Duan Gaijun of water room and water room is solder structure, weight goes to a few tons by a few tons, because the structure is relatively complex, means of reason effectiveness for a given period of time used spectrum effectiveness for a given period of time to impose the kind of double effectiveness for a given period of time of standard effectiveness for a given period of time. Through the water room of oscillatory ageing treatment, some has worked more than 3 years in the power plant. The volume of ordinary water room is larger, hot effectiveness for a given period of time needs bigger heat treatment furnace, processing cost is in every 10 thousand yuan of above, plus carry, the manufacturing cost such as processing cycle is higher. And next line working procedure turn after oscillatory effectiveness for a given period of time is machining a Shi Zhen of ground on the spot formerly, produce cycle not only very short, and processing cost is extremely low. The bearing box after ⑹ other rough machining, underline platform, oar carriage box of noise room of box of bracket of sexual board, bedspring, mat, disappear, missile is waited a moment. Its weight goes to a few tons by hundreds of kilograms, according to the requirement of component part and structure, use respectively inferior resonance effectiveness for a given period of time, standard effectiveness for a given period of time, spectrum effectiveness for a given period of time. 3 conclusion anyhow, move load to adjust its remains stress through bringing to bear on to component part, having a lot of advantages is unassailable. Its technology benefit and economic benefits are very considerable, especially a few beneficial result that cannot assess. Because oscillatory effectiveness for a given period of time is right the leveling action of the leftover stress of component part, make the airframe of component part produced certain sclerotic effect, accordingly, already leveling stress added component part again fight be out of shape ability and opposite dimension stability. Especially turbine group work is in 3000 turn below, and the frequency of effectiveness for a given period of time of spectrum effectiveness for a given period of time is controlled in this limits mostly, can consider as a kind of second load the purpose of forging, passable discovery a few potential defect, it is the thing of kill two birds with one stone. CNC Milling CNC Machining