New camshaft grinding analyses a technology

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  • source:DELENO CNC Machining
It is ceaseless nowadays that the process is optimized develop and ceaseless comfortable what the aircraft processing factory that change should finish is basic " train " . Enhance international competition ability, shorten part handling time and " it is good with respect to production yesterday that hate cannot order goods today " delivery time asks they must be done so. Regretful is, optimize camshaft salient grinding to the process never acts well and be achieved expect an end. Its rely on the experience of operator and intuition greatly into power. Tie of trends of mature foregone machine tool and salient outline in order to suggest " probably " the computer program that machines speed occurs really. However, still need to repeat undertake a lot of experimental grinding, through be being considered as skill experienced operator completes grinding process. When producing salient burn phenomenon, certain production manufacturer chooses to reduce increment of emery wheel feed, a few otherer manufacturer lowers treatment rate. This kind " Chan Ping feels " sensory change can eliminate grinder burn appearance normally, but the course that can not produce a course to optimize certainly however. Digital type model is made is a kind of products plan person depend on the actor chemical industry that design and assembles newly with finishing to provide for years. The favour of the production manufacturer that this kind of technology is thought to coordinate its metal accurately to machine a process increasingly by those. Such one kind can forecast tool of sexual computer software, let them go up from some spare parts true purify before any material, in eliminate the case that certain course guesses and tries collect job to fall, organic meeting is adjusting the result sees instantly after the process is variable (undertake adequately " if so " a kind setting imitate) . A kind of digital type model that is used at camshaft salient grinding makes a tool had come out now. The quantity of heat that passes the generation in forecasting grinding process actually, salient is circumferential the position that go up and the deepness that achieve below salient surface, the software of this kind of new-style hot model that make makes generating program of career of treatment of computer of existing camshaft grinding further upward. Can identify the area that gives possible presence issue instantly from simple chromatic scheme, and can experiment give variable of process of won't hot to salient generation losing in order to decide as far as possible the rapiddest treatment rate. Landis grinding system (city of Waynesboro of Ni Yazhou of guest evening standard) had analysed in grinding of its Tetra4000 camshaft a kind of such hot models were added to make module in the program. The salient of 3L CNC camshaft that this program can contain drive of feed of emery wheel of linear electric machinery in the company is used on grinder. This kind of model makes a tool " timely rain " coming is moment, because more and more specialized worker had arrived,retire the age. Hot model is made optimized camshaft grinding process not only, at the same time it still acted as between camshaft architect and manufactory home groom tool and bridge. The grinding of outline camshaft salient of existence problem posed the nonexistent difficult problem in homocentric grinding operation. The osculatory area between emery wheel and salient (also say to contact arc) pass salient as emery wheel circumferential and different position and constant change. Osculatory area is in relatively compressed profile is the biggest, and the basic circle that compares a circle in camshaft and upright department is smaller. Accordingly, burn happens the most possibly in flank, each production manufacturer also are here just about speed of rein in treatment produces burn with preventing. But, guess already typical ground pointed out well-trainedly should lower treatment rate much higher rate. Salient geometry structure also becomes more and more complex. A lot of gyro wheel camshaft contain a sunken outline that enter type in flank nowadays. This kind of feature, also be called to lose curvature radius (NROC) , the design uses at optimizing a powerful person open and shut, with raising engine power is mixed reduce discharge capacity. But, it brought the osculatory district of additional constant change however, the grinding process that makes a kind of job difficult already becomes even more complicated and confusing. In addition, new gyro wheel camshaft should experience taller osculatory stress than the design previously, this is meant must pay close attention to fire damage closely. Salient grinding is divided into rough machining and finish machining phase commonly, although they are,happen in loop of a treatment. The purpose of rough machining is purify as far as possible much material. Right now, fire damage problem is not very great, transverse feed deepness has the emery wheel that because successive rough machining uses enough,any material injure a layer before purify. But, in final rough machining, fire damage scarcely can be such deep and make the finish machining process that uses horizontal feed of lesser emery wheel cannot eliminate it. Parameter input is in apparently, so complex to be like camshaft grinding production process undertakes the model makes training appear it seems that not intuitionistic. But, it is a kind of simpler input foregone and the machine tool that already announced, emery wheel and the process that cooling fluid is worth. The hot model module that make is built in existing treatment speed is optimized and repair foundation of divide evenly program to go up quickly, this kind of program rises Cheng to distributing besides material purify rate and salient outside the graph, still consider variable of traditional machine tool function. Camshaft architect in order to circle salient circumferential every degrees of means of how many litres of Cheng offers litre of Cheng distributinging plan. Grinder manufactory offers machine tool trends to be restricted to be worth feed of such as emery wheel acceleration and speed of box of jumpy, main shaft and jumpy wait for data. 3 when produce need of place of hot model module main parameter are: Cr is worth -- the material purify capacity that this kind of numerical value that reachs through experience represented emery wheel, reach emery wheel material and bond with camshaft material (cubic nitrogen changes boron namely CBN material is qualitative, the emery wheel that uses bond of pottery and porcelain is to be used at grinding camshaft currently the most commonly used emery wheel) the type is concerned. These Cr values come out from the derivation in machine tool force and power measured value. "C " heft expresses to grind a density (of abrasive and bond than) , "R " state develop of emery wheel surface attacks structure (scratch width is right scratch deepness) . Heat allocation is invariable -- this is the per cent between the quantity of heat that the heat energy that enters a spare parts and cooling fluid take away. Heat allocation constant is mixed to oil water radical cooling fluid is different respectively. Feed increment -- this is emery wheel the deepness that every knife cuts salient (be in normally emery wheel / the place carrying a department with salient contact the least area is the least) , and part to rough machining and finish machining differ. Emery wheel is not with helix means chases advance gradually to give increment depth, however direct feed arrives this increment size and in this deepness will maintain all round whole salient. This feed increment wants to be more than finish machining loop circularly to rough machining commonly, and it is led with material purify directly relevant. Temperature information heats up the color graph that the model produces to have two kinds. One kind shows actual salient figure, contain show turn in camshaft the lubricious temperate zone that the heat below surface of the salient when circuit distributings (1) seeing a picture. The temperature peak value of face salient center expresses to produce the section of the problem. Graph 1: This graph uses the hot model that is used at camshaft grinding to make software generate. Showed salient is circumferential in the graph the position that produces fire damage likely in grinding process. Another graph rotates with camshaft (unit: Degree) state with the relation between exterior deepness temperature distributings. This kind of graph states all sorts of temperature are in salient is circumferential some is bit more specific achieve what kind of deepness (graph 2 denotive it is camshaft turn an example) of this kind of graph when circuit. Graph 2: When this graph showed emery wheel cuts one knife on salient, the quantity of heat of generation, achieved deepness, in salient circumferential go up bit more specific salient surface situation. Popularly, want scale whole grinding circulates in order to be used at the analysis, include rough machining and precision work (the model) that software can make camshaft turn 20 rounds at most. Show by fiducial data treatment process should maintain in what kind of temperature level and penetration, particular case is decided according to camshaft material. After evaluating quantity of heat and penetration, can grind a loop to parameter undertakes modulatory and deciding essence of life in order to ensure any fire damage layers before take out. Sunken to taking the camshaft that enters outline, will make a model circularly to two grinding. A model will is aimed at use big diameter emery wheel to be opposite the rough machining of whole salient appearance, another is aimed at with small diameter (it is commonly sunken the 80%) arenaceous wheel pair that enters a diameter is sunken undertake finish machining and grinding into outline. Complete finish machining process again to finish rough machining already on a grinder, need a machine tool that contains the deputy main shaft that uses little emery wheel. Newest camshaft design is had in the flank of salient sunken into outline. These outline are machined on a machine tool that uses deputy main shaft normally, deputy main shaft is used than advocate main shaft wants little emery wheel with the emery wheel at outline of rough machining salient. To rough machining and 2 finish machining / sunken build hot model into outline grinding operation. It is OK that the hot model of the bridge camshaft grinding between different project major is made help design is formed together with production engineer optimized camshaft is designed and make a process. The main attention dot of production engineer is productivity, output and quality -- the spare parts that how machines a qualification as soon as possible namely. Camshaft designs an engineer to must decide stuff kind and salient outline according to camshaft load circumstance. Metallurgy major personage participates in this process possibly also, he basically cares remaining stress and the quantity of heat that produce in grinding process. Have the aid of heats up a model to make, production engineer can design the model that make to new camshaft, the produces in grinding process lieutenant general phenomenon that reports to architect and metallurgy major personage this model place is forecasted, and whether can be this accepted according to material and design etc. Hot model is made still can use as of camshaft grinding process groom tool. For example, before developing this kind of model to make software, people thinks consistently to machine speed to have the biggest effect to salient burn and crackle, this is why normally it is the first variable that wants a change. Already affirmatory, compare with emery wheel feature and photograph of deepness of increment of emery wheel feed, machining speed is one of sensitive least of all parameter actually. The technology of this kind of hot model that make still can be used at variable of help identifying process to begin the problem of occurrence grinding burn or crackle however without the change. An example is to a production manufacturer receives value of a batch of hardness accidentally to exceed predicted camshaft. When producing a problem indescribably it seems that, in claim already temper by dipping in water comes forcedly undertake the model is made heating up on the camshaft salient of 60 Rc. The model that makes makes clear should not produce processing problem, because this undertook material hardness then,experiment. These experiments announce give a batch of new camshaft actual hardness is 65 Rc. Once determine this, built the 2nd hot model again, reached in the light of a batch of hardness taller camshaft machines speed newly. Grinding of crankshaft music abduct is another process that uses hot model to make a technology. Hot model is made still accept a test in the inadvertently grinding respect of homocentric diameter. Like camshaft grinding, this kind of model makes ability won't eliminate test grinding process completely, but the opportunity that it offerred the salient grinding course that reduce experiment grinding number greatly and optimizes with more scientific means development really. Sabir: ? Gu is planted cave commonplace さ flinchs? of discharge Xin ㄒ rises Cheng (Lift) , follower and cam salient are conterminous touch the gross that has linear campaign. Upright ministry (Nose) , of camshaft most advanced, follower rises Cheng the largest part. Basic circle (Base Circle) , 0 litres of Cheng deliver salient admiral the area of follower. Flank (Flank) , what come and leave camshaft to carry a department guide on camshaft roughly compressed part. Be in just about this area, the osculatory area of emery wheel and salient is achieved the biggest, produce grinder burn the most possibly. NROC, the abbreviate of negative curvature radius, it is some crankshaft flank in sunken the outline that enter. The center of this circular arc is located in outside salient side. Sunken into outline (Re-entrant Profile) , make a way another times of NROC. Treatment speed (Work Speed) , camshaft is in the spin speed in grinding. Transverse feed (Infeed) , every knife enters emery wheel the linear quantity of camshaft salient (increment) . CBN, cubic nitrogen changes boracic abbreviate, it is the emery wheel abrasive with camshaft the most commonly used grinding. Turn pull (Turn Broaching) , a kind of working procedure of outline of rough machining salient, use circumferential tape the big diameter of a lot of razor blade cutting annulus is thick before essence of life is ground cut salient outline. Green grinding (Green Grinding) , the process from outline of salient of the grinding on round good stuff. New emery wheel technology is making this technology is become turn the competitor that helps technology. Contact arc (Arc Of Contact) , the osculatory area between emery wheel and camshaft salient. This contact area reachs upright ministry to basic circle, flank, NROC each are not identical. Equivalent diameter (Equivalent Diameter) , a value that expresses to contact arc, the treatment from emery wheel diameter and constant change (salient) the derivation in the diameter and come. CNC Milling