The company of MTU aviation engine that is located in Munich was installing INDEX G400 muti_function Che Xi is compound after the center, reduced the time that repairs place of aircraft engine stator to need substantially. In the meantime, because comprehensive automation treatment came true on this machine tool, accordingly its economic benefits also rises greatly. This solution is very good, special agree with this application domain, and to itself of machine tool manufacturer character, also be a real challenge. Company of MTU aviation engine is Germany a banner engine creates a company, very tall place is had on the international market. In July 2000, this company already had Daimler Chrysler AG (acting Mu is strapped - Kelaisile) all share of subsidiary. The turnover 2001 is this company 1.5 billion euro, increased 2.2 billion euro 2002. Although tourism appeared the crisis, but MTU company still carried good development state. "In the past, undertake turning and grinding are machined on the machine tool that we often need to differ in two. In the meantime, machine tool operator still must use straightedge adjustment to set point of view, control grinding craft with manual means. " Mr Walter Schoefbeck is right its from company of German Esslingen INDEX-Werke new purchased RatioLine series G400 is muti_function Che Xi is compound center (graph 1) a section chief that well-content Mr Schoefbeck is company of engine of Munich MTU aviation, be in charge of the maintenance of this company and department of CM client market, responsible " RB 199 " model aircraft engine (graph 2) treatment operation attempers. The component of engine (rotor and stator) supervise in his namely under of job of the repair that finish. The service group have the aid of of MTU company makes at machining center of this G400 Che Xi the comprehensive treatment of engine strode important one step. This kind of new-style machine tool basically applies at the treatment of engine stator: Turning of will adiabatic covering layer machines formulary dimension, undertake to oriented Xie Sao accurate grinding is machined. Reduce explanation of manufacturing handling time Mr Schoefbeck to say: "Former, our workshop is one assembles a ministry purely, use a machine tool without manufacturing treatment at all. " in those days, treatment has in repair shop, will adiabatic covering layer is cleared over there the stator head preexistence that waits to repair. Anyhow, the treatment on the machine tool that differs in two is very time-consuming: Undertake on lathe of a CNC turning is machined namely, connect lathe to go up to be machined into travel grinding in another general, replace its lathe tool by emery wheel among them, installation serves as a grinder to machine production on lathe. In addition, workpiece still needs to be in repair shop and assemble undertake carriage between the workshop. Today, be in " true assembly workshop " in, had installed machining center of a new-style Che Xi, use at the treatment of stator, still have a high speed grinding machine that makes technically for client design, deserve to laser surveys a system, use at the grinding treatment of rotor, in addition still provided 3 balancing machine. This not only mean more machine program to be able to be centered on a machine tool to finish, and these jobs can be in same finish inside the workshop, make produce handling time to reduce 50% above thereby. Now, every weekday is achievable the treatment of two rotor. Treatment precision must engine of absolutely and accurate aircraft and its component need to satisfy extremely high safe demand. The computer of plug-in unit type that goes up when the plane issues signal, when showing engine already obtained formulary term of service, it is met by tear open from the plane come down or be become by fractionation package, send repair shop, undertake the overhaul to each component or wash out processing. Course maintenance is the following each spare partses, again by assemble a workshop to assemble its a complete engine. Besides a few otherer besides the spare parts, the maintenance of engine stator needs the lamina that discharge is divided and changes to had damaged above all, use thick turning to machine covering layer of methodological purify heat insolation at the same time, be in eletroplate groovy lieutenant general its keep clear of clean entirely. After this, reexamination whether do these component appear interstitial, undertake metrical next. Adiabatic covering layer needs to use thermal spraying method new spray. Above all, below the circumstance of oriented without installation lamina, assemble stator together with bolt, machine the turning of adiabatic covering layer after spray internal diameter dimension of the regulation next. This is machined according to the turning of set dimension, and the finish machining grinding of oriented later Xie Sao, should achieve absolutely treatment precision. Above all, machine each rotor grinding the external diameter dimension of a requirement, machine turning of covering layer of stator heat insolation internal diameter dimension of the regulation next, make its match with the external diameter photograph of this kind of means and rotor. Use this kind of type " compensatory grinding machines a method " , can make the blade tip clearance between rotor lamina and stator gush coating achieves very tall precision. Next, through the oriented lamina that same method machines, in stator crust (graph 3) install perch. Crust should agree with the installation level of each oriented lamina, undertake to Xie Sao accurate grinding is machined next. Here, the precision requirement that its grinding machines also is very tall, because the treatment of this phase decided the blade tip clearance between rotor attrition coating and oriented lamina. Nextpage is finished on same table machine tool accordingly, stem from the consideration of time and quality, these two accurate treatment that with treatment craft concerns (the grinding of the turning treatment of spray layer and oriented lamina is machined) pressing requirement finish in same machine tool. Previously, when be machined respectively on two different machine tools, operator must use desired result tool, undertake for many times metrical to every lamina, so that make,the level of every lamina reachs formulary measured value. Use dispute of this kind of method to often expend time, and not easy also control. Because assembling a workshop, engine is cannot assemble in the round reach the designated position, unless what its use component (stator and rotor) had reached the designated position entirely. If comprehensive treatment can come true on same table machine tool, use treatment measure integratedly assemble a workshop, so achieve likely " one Shisan bird " purpose: Produce plan cost to reduce namely, handling time decreases, treatment precision rises. However, the company spent two years of much time, just find appropriate treatment machine tool. Can believe firmly, the machine tool that has a lot of can finish turning and the job that grinding machines at the same time, but " the investment expenses that considers a machine tool is very be necessary. " Mr Walter Schoefbeck says: "Long-term since, we did not find manufacturer of a machine tool all the time, our requirement can be satisfied inside reasonable economic range. A lot of machine tool manufacturer can offer the lathe that has grinding function, but always cannot solve oriented Xie Sao is machining a process to measure an issue mediumly (graph 4) . Our apt uses conveyer belt of a kind of disc the vertical lathe solution of type, however the configuration of this kind of machine tool needs to satisfy the requirement that machines heavy-duty spare parts normally, because this value is relative taller. We once were contacted with much home company, but the solution that proves they suggest finally is not very economy. Like the case that provides a machine tool, its quality is changeful. Even if the manufacturer of those quite famous gas, also there is no lack of ' acceptance is much, cash little ' company. " the first time meet believe thoroughly finally, be in on fair of machine tool trade, mr Schoefbeck came to Esslingen INDEX-Werke company eventually before exhibiting a stage. "The manufacturing deepness of this company and product quality attracted me immediately. " " the good cooperation with manufacturer of this machine tool " particularly principal to be being had for Mr Schoefbeck port, "Because assemble a section as, we do not have more experience to machining a machine tool. " the RatioLine series of this company is new-style G400 is muti_function Che Xi is compound center, left deep impression to this section chief, he thinks this machine tool special agree with their treatment production. In addition, the controller of INDEX company made a response enthusiasticly also, they care the treatment question that Mr Schoefbeck place raises very much. Above all bewitching is configuration of this machine tool has agile muti_function treatment is unit, can cut into drive a vehicle, auger cut and milling treatment, but of automata cutting tool change, the clamping apparatus orgnaization that safeguards in great quantities without need (graph 5) . Nextpage " we needed technically to transform a car afresh for the application of MTU company - auger - milling machines a head, make its can apply to grinding treatment. " the controller of INDEX company expresses. "The good sex price that has as a result of the machine tool place of INDEX company is compared, and the overall performance of be convinced making a person, final the machine tool that we decide to choose INDEX company. " Mr Schoefbeck expresses, "To our machine tool, grinding treatment is not the thing with strange what, although the domain is machined in vertical,also be such. However, in the application that this kind of circumstance issues now, still belong to newly emerging things to us. Because we use treatment of dry type grinding, because this must use empty cold means,will cool grinding main shaft. " be being measured among them is a very main factor, what can believe firmly is the standard way in regarding INDEX machine tool as process offers measure. According to the view of Mr Walter Schoefbeck, itself of this kind of solution also had gotten confirming. "Above all, the element that its are about to assemble won't be polluted; Next, operator can get very good protection, lest get the enroach on of harmful dust grain. " oriented blade is made by nickel alloy or titanium alloy, and its lie between thermal spraying covering layer is material of a kind of alumina. On the machine tool of MTU company, the dust grain that produces when treatment can pass a kind of special aspiration arm to get on its from treatment dot directly eliminate to go out. To directing the grinding of blade is machined, still additionally one kind of special situation needs to explain: Every stator has a few different blade levels, its diameter is alterable. In addition, the Xie Sao of oriented lamina tilts towards axes direction, the complex rate that raised its to machine thereby (graph 7) . Today, machine a stator, need to make an appointment with in all 4. 5 H, among them turning treatment is about 1.
5 H (graph 8) , grinding treatment makes an appointment with 3 H, include to change time among them. Last working procedure is the burr that from cleared grinding is machined on Xie Sao place bequeath issues. Right now, can insert a brush coming back automatically through trading knife unit, change its direction of rotation at the same time, the burr clear clean down on workpiece. Realized the treatment of highest desire Mr Walter Schoefbeck to this machine tool precision believes firmly undoubted: Even if 0.
The precision public errand of 05 Mm, also can satisfy its to be in the requirement of diametical respect, but the test in installing a process makes clear, its precision public errand already was achieved 0.
The level of 01 Mm. After using a few months, mr Schoefbeck is more satisfactory to investing a decision this. "The cooperative effect with INDEX company is very good, its all acceptance got cashing, in unit process of cargo bandling, INDEX company gave good support, still wove machine program reachs his all subprograms, groomed in the spot our operation personnel. In the machine tool installation checks and accept two weeks after qualification, they can have freelied the ground uses a machine tool to undertake was manufacturinged formally. " " those who be worth to be carried is, the machine tool has not produced great shutdown accident up to now. " Mr Schoefbeck says, "A few small issues can get settlement through phone connection. The hope that we express this machine tool and manufacturer place got the implementation of 100% . " the value that this new-style machine tool proved it inside so short time, also satisfied the treatment requirement of other part at the same time. Anyhow, the treatment target that place of G400 machine tool includes got distensible further, the spare parts that makes its can be machined reached the biggest range. CNC Milling
CNC Machining