Engine key component processes the application of cutting tool

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  • source:MOMEYER CNC Machining
Limited company of Dalian engine car only then built 1899, be subordinate to belongs to Inc. of Chinese north car. It is design of engine of domestic diesel locomotive, electric power, research and development and production bibcock company, the product has important place in Chinese railroad market, it is one of manufacturer of 6 transfer of technology that railway ministry key gives aid to, also be our country only can develop the national stress of car of orbit of engine of diesel locomotive, electric power, diesel engine, city at the same time large company. As Dalian machine the abidance of the company develops, with international big company undertakes the technology cooperates ceaselessly, the production precision of component has the key of the new-style engine of research and development to promote considerably, use new-style material to make machine difficulty to increase in great quantities, the efficient treatment problem of crucial component is the subject that the enterprise studies all the time. High-powered cutting tool is used extensively in the enterprise, make machining technology swift and violent development, but cutting tool of try to win sb's favor is easy, it is very difficult to use good cutting tool, how to use cutting tool to be achieved effectively fall the purpose of this synergism is the focal point that makes a company study currently more. The treatment craft of crucial to engine component undertakes the characteristic of cutting tool of application of engine key component the discovery after the analysis, the spare parts with treatment tall difficulty basically has component of key of engine diesel engine to be like airframe, baseplate, crankshaft, connecting rod to wait, the crucial component that engine takes a part holds axle box, hollow axis in the arms to assemble like scroll, bear the weight of type gear case, these spare partses not only the structure is complex, production precision is tall, demand of exterior surface roughness is high, requirement spare parts has good interchangeability not only, want to have intensity and tigidity again, these elements make crucial component machine a large number of medium use high-powered standard cutting tool and special cutting tool undertake machining. Current, china and foreign countries of treatment of component of key of mechanism of engine diesel oil buys high-powered standard cutting tool and scale of the cutting tool that be not mark to be 1 ∶ about 1; The treatment China and foreign countries such as the crucial component that engine takes a part buys high-powered standard cutting tool and scale of the cutting tool that be not mark to be 6 ∶ about 4. The choice of the in choosing to machining actually cutting tool that uses cutting tool basically considers the following factors: Precision of appearance of workpiece material, workpiece, treatment, surface roughness of tigidity of treatment machine tool, system, surface. With diesel engine baseplate advocate oil duct ø79.

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The treatment of 074 aperture is exemple, baseplate semifinished product uses QT500(of nodular cast iron graph 1) . Graph baseplate of 1 diesel engine because this aperture is advocate the place with sealed oil duct, the exterior surface roughness of aperture is Ra0.

8, every baseplate shares 10 advocate oil duct ø79.

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074 aperture, the length of aperture is 100mm, the span between them most greatly 300mm, and because this aperture is located in,close the extreme of antrum, use dragon door the existing accessory head of machining center obtains treatment position hard, cannot realize treatment. Baseplate total length is 3000mm, antrum closes to see less than adjustment when because adjust cutting tool and boring model,be being machined with common boring lever the position, treatment quality assures hard. Dragon door handkerchief of Ma of Germany of machining center application (the treatment program of the reamer of accurate and special boring that Mapal) company produces, cutting craft pursues (graph 2) , join among them boring lever and cutting boring lever each one, lever of the boring that prop up 3 (set alloy is propped up guide) , the buy before cutting boring lever an essence boring cutter, postposition reamer of essence of an odd blade, installation machine places razor blade of adjustable hard alloy boring and cutting blade, use first the treatment means of the bore with a reamer after boring, boring cutter treatment machines the first paragraph with locating Kong Wei directs advocate oil duct aperture, boring cutter machines dimension to be less than reamer to machine dimension, ra0 of exterior surface roughness can be obtained after reamer finish machining.

The high accuracy aperture of 8, the 2nd paragraph of etc advocate oil duct aperture begins from cutting in order to guide prop up direct for fixed position, offsetted cutting tool and main shaft arise because of cutting force shake, apply the result: 10 paragraphs of ø79.

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The classics after 074 aperture are machined detects measure is all and acceptable, exterior surface roughness achieves Ra0 entirely.

8, the operation is simple efficiency is tall, satisfied effectively advocate the sealed requirement of oil duct. Graph figure of 2 cutting craft is crucial to engine the working procedure with the treatment taller precision of component (the headstock aperture that is like airframe, scroll holds axle box size in the arms to carry aperture to wait) chosen cutting tool (the boring cutter that be like essence of life) integral function and quality demand are very high, chosen cutting tool basically counts an import, it is international basically well-known trademark cutting tool, the integral function of homebred cutting tool and look of entrance cutting tool are fairer than having difference, basically use at machining precision slightly low working procedure. The treatment application of homebred milling cutting tool in engine key component is more, sexual value is better, use domestic cutting tool to be able to reduce cost effectively like the complex cutting tool such as milling cutter of hollow axis flute profile, assure quality. Cutting tool of the hard alloy in cutting tool material takes dominant place in material of numerical control cutting tool, hard alloy cutting tool basically is used at the semifinishing machining of engine key component and finish machining, other the rough machining that basically is used at the spare parts like the cutting tool such as high-speed steel, the hard alloy cutting tool that uses in treatment includes all sorts of machine to place but dislocation cutting tool, integral type establishs milling cutter, reamer, tap and broach to wait, applied range is quite wide. Cutting tool of coating hard alloy has the characteristic that has taller hardness, wearability, hear resistance than matrix, hold sum total of hard alloy cutting tool about 60% . To milling cutter of integral hard alloy, broach, reamer, reamer and complex cutting tool, the company undertook the craft that grind is developed can be weighinged, after cutting tool classics is ground again, these still can continue to use, saved many cutting tool cost. The application of cutting tool of pottery and porcelain still is in start level, the material as a result of workpiece (basically be cast-iron with alloy structure steel) the interrupted cutting in treatment is more, cutting tool of pottery and porcelain is impulse withstand poor characteristic restricted his to apply. The green cutting cutting tool of energy-saving environmental protection already applied at the company to buy equipment newly in matching a knife, means of high speed cutting is preliminary already obtain result, will fall as company cutting tool the further development that this synergism studies gets popularizing. The high rate that the company will draw lessons from a developed country to use place of advanced cutting tool to have next, big feed, small cut deep concept, with international advanced cutting concept conforms, the cutting engineering technology with advanced research and development. CNC Milling