The emulation of force of cutting of stainless steel of 3Cr13 of high speed turning is analysed

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The index such as function of shrinkage of the intensity of introductive 3Crl3 steel, outspread rate, section, concussion compares 45 40 steel, steel tall, it is a kind of plasticity good in carbolic martensite stainless steel, commonly used at making the part with mechanical performance higher demand, wait like lamina of bearing, turbine, water press a powerful person, valve base. Consequently, the cutting function of 3Crl3 material aroused the research interest of industry. A lot of scholars had made different research in the light of 3Crl3 material. If the person such as Fan Lin puts forward 3crl3 to be in what arise to cutting tool in cutting process to fight muscularity, treatment is sclerotic and serious, cause cutting tool wear away serious, cause increase of the number that grind a knife, productivity is reduced; Point out want the treatment technology with sound formulate only, choose angle of geometry of cutting tool material, cutting tool and cutting dosage correctly, its cutting function can get ameliorative, can obtain good exterior quality and taller productivity. The characteristic that Du Guochen machines to 3Crl3 material CNC Turning undertook an analysis, point out when CNC Turning undertakes below average rate, wait for technology measure through cutting tool of logical choice cutting and cutting dosage, can improve the turning efficiency of stainless steel spare parts significantly. H. BIL. Apply AdvantEdgeFEM etc finite yuan software built orthogonal cutting finite yuan of model, emulate treatment and experiment to rigid material, as a result the watch looks askance emulate with be identical of experimental result photograph, still point out at the same time, the formation that cuts bits is the result that plasticity flows. Wang Huaifeng through software of AdvantEdge FEM simulation the milling to Ti6A14V of aviation titanium alloy machined a process to undertake 2 dimension imitate emulate, used only factor experiment to obtain deepness of feed of rate of axial milling deepness, milling, every tine, radial milling to be opposite the influence rule of milling force. In light of integrated research current situation, to the cutting of 3Crl3 material research is centered at the qualitative analysis below common cutting speed mostly, rarely seen also study about what to its at using AdvantEdge FEM software cutting process undertakes emulation an analysis, consider the research that cutting tool angle and cutting dosage affect to cutting force at the same time especially. Article author is a target with radial cutting force, with feed, back the horn before speed of quantity of penetration of a cutting tool, turning, lathe tool, hind 5 cutting such as horn are independent variable, software of simulation of applied AdvantEdge FEM undertakes turning of 2 dimension high speed is emulated, experiment through orthogonality, analyse each cutting parameter to be opposite the influence rule of radial cutting force, use extreme difference to analysed a law to reach in the best combination that gives parameter of the cutting below cutting condition, for the experiment of high speed turning of 3Crl3 stainless steel research provides beneficial reference. 1 finite yuan the model is built at present, the numeric imitate method in cutting process basically has way of Oulafa, Lagrange. Ou Lafang law is to use finite territory of yuan of reseau description airspace, commonly used will describe fluid campaign, but this method cannot the formation that imitate cuts bits; Lagrange law is commonly used at describing solid be out of shape, its are finite yuan of reseau as workpiece be out of shape and be out of shape, because be in cutting process, the appearance that cut bits is not fixed, lagrange law can adjust dimensional reseau to describe attrib border condition ceaselessly. In AdvantEdge FEM getting used to reseau technology oneself is the initiative reseau that passes definition geometry character and acceptable error level, namely reseau differentiates grade parameter, thick change coefficient, refine the parameter such as coefficient, the error that gets according to computation estimates a result, the adjustment that larger to the error area undertakes local reseau and optimize. The feed that considers the workpiece in machining a process and cutting tool moves, reseau will be out of shape as what process the work in the process and generation is out of shape, accordingly, use Lagrange law to build finite yuan of model, make full use of in AdvantEdge FEM get used to reseau technology oneself, in order to raise simulative operation precision. 1. 1 cutting tool the because there is 3Crl3 in this software database,builds material of one workpiece model, and emulate aim to machine establish for the experiment an appropriate parameter takes value scope. Consider to the main index of cutting function is affected in machining a process, wait for parameter like hardness, tensile strength, to make simulative result adjacent and actual, in imitate the material of 420 stainless steel that is close to most with 3Crl3 hardness and tensile strength is chosen to replace in emulating, because the hardness of 420 stainless steel is HB223, the hardness of 3crl3 is HB235, both comparatives almost. Of the cutting tool in considering treatment and workpiece material match a characteristic, cutting tool chooses the horniness in library of software cutting tool to add up to meeting cutting tool. Build 2 dimension model to if the graph is shown 1 times,be plowed. 1. 2 finite yuan reseau differentiates and setting of workpiece imitate parameter is in AdvantEdgeFEM software, the speed speed that reseau delimits the big little toe of scalar parameter G is standing by cutting blade part to change to fine reseau by thick reseau change, among them, 0. 1<G<1, when G=0. 1 when slow change brings about global fine reseau, when G=l rapid change brings about thick reseau, this software delimits to reseau scalar parameter has been secured, take G=0. 4; Reseau is thick change coefficient to show reseau is fast thick change its the speed of the largest size, after deciding unit to be out of shape thick the rate that change; Reseau refines coefficient to show reseau refines degree namely reseau is refined quickly to its the speed of the smallest size, in Advantedge Advantedge=" ">Imitate of turning of 2 high speed is emulated reach a result to analyse 2. The simulative of affirmatory turning process of parameter of imitate of turning of 1 high speed emulates mode to be standard mode, use dry type turning. The horn before certain experiment factor is speed of quantity of penetration of a cutting tool of feed, back, turning, lathe tool respectively, horn after lathe tool. The dosage of treatment 3crl3 cutting that offers according to document place limits: Feed (0. 1 ～ 0. 2mm/r) ; Back penetration of a cutting tool is measured (0-3 Mm) ; The horn before lathe tool (20 ° of 10 ° ～ ) ; The horn after lathe tool (5 ° ) of one 10 ° , by bibliographical reference knowable to stainless steel material character, when turning speed is more than 500 M/min, it is high speed turning namely. Accordingly, when design orthogonality experiments, if the element level of every element expresses 3 to show. 2. Analysis of 2 imitate result and computation express earmark Ln(tq) according to orthogonality, among them L expresses code name for orthogonality, n expresses linage for orthogonality namely experimental set number, q expresses a number to look because of prime number namely for orthogonality, t counts yardage for orthogonal watch namely the horizontal number of the element. The analysis in article is a target with radial cutting force as a result, the horn before influencing factor is speed of quantity of back penetration of a cutting tool, feed, turning, lathe tool reachs the horn after lathe tool to wait for 5, number of definition element level is 4, experiment design chooses watch of L16(45) commonly used orthogonality, if the watch is shown 4 times,each experiment and its cutting force emulate a result. To analyse the remarkable extent of the each element influence to cutting force, and the best combination that seeks each element, use extreme difference law to undertake analysis and optimize. Extreme difference analyses law computation to understand easily handily, intuitionisticly, simply, can mirror the remarkable extent ㈨ that each element affects to cutting force. Applied extreme difference analyses a law to undertake visual analysis to experimental result, the average influence of the horn after the horn before computation gives speed of quantity of back penetration of a cutting tool, feed, turning, lathe tool is mixed to F of radial cutting force the effect. The analysis sees the watch is listed 5 times as a result. In form, m1, M2, M3, M4 is the average that force of radial below same standard cutting mixes each ingredients; Extreme difference R is an element the difference of the maximum in the average of radial cutting force of correspondence of the photograph below different level and the least value, its size mirrors each elements to be opposite the influence degree of radial cutting force; And by the size that all is worth in form, can reach the best combination of each element. By the extreme difference in the watch the value can be seen, in software AdvantEdgeFEM imitate stainless steel of 3crl3 of 2 dimension turning emulates a process in, the influence degree to radial cutting force from arrive greatly before quantity of the small ordinal penetration of a cutting tool that it is a back, lathe tool after speed of horn, turning, feed, lathe tool horn. At the same time by the watch knowable, be in when feed the 4th level, quantity of back penetration of a cutting tool is in the 1st level, turning speed is in L level, the horn before lathe tool is in the 4th level, the horn after lathe tool is when the 2nd level, radial cutting force all is worth the smallest, because this reachs best combination is: A4B4c4D4E2. According to this assorted level numerical value takes the place of to undertake turning emulate test and verify into software AdvantEdge FEM, get volume of radial cutting power is 30. 9 N. The influence rule analysis of 3 treatment parameter to cutting force is expressed by the extreme difference of radial cutting force can see, feed is to the incidence of cutting force 146. 9 ～ 179. 2 N; Carrying penetration of a cutting tool on the back to measure is to the change of cutting force from 65. 4 ～ 270. 1 N; Turning speed is to the incidence of cutting force 130. 7 ～ 185. 5 N; The horn before lathe tool is to the incidence of cutting force 134. 3 N ～ 216. 8 N; The horn after lathe tool is to the incidence of cutting force 158. 7 ～ 180. Between 7 N. Graph the 2 horn before be speed of quantity of penetration of a cutting tool of feed, back, turning, lathe tool, horn after lathe tool is right the influence rule of radial cutting force. When undertaking to 3crl3 stainless steel experiment of high speed turning is machined, should reasonable the extraction that chooses each parameter is worth limits. Generally speaking, the experiment of each parameter takes Lv of value scope take an examination to machine the requirement of the respect such as experiment of carrying capacity of machining complex of efficiency of exterior quality, treatment, equipment, facilitating arrangement. By graph 2(a) knowable, as the accretion of feed, after radial cutting force increases first, reduce, when because this is in,the experiment decides feed, drafting chosen limits is: 0. 1 ～ 0. 18mm/r; From the graph 2(b) can see, as the accretion that bears amount of penetration of a cutting tool, radial cutting force shows approximate and linear growth, when the back quantity of penetration of a cutting tool is achieved 2. When 4 Mm, amplitude of radial cutting force is very big, consider the cutting depth range when 3crl3 material finish machining, so control of capacity of back penetration of a cutting tool is in O. 3 ～ 0. 7 Mm limits; Graph 2(c) reflected radial cutting strength the along with the accretion of turning speed current that after rising first, reduces, from the back 3 amplitude that the dot reduces are lesser, the curve is approximate and smooth, to make cutting power level of test of lesser, facilitating choice, real in the speed limits that manipulator bed place allows, because this chooses turning speed limits to be in 500 ～ 900 M/min; By graph 2(d) knowable, as the accretion of the horn before lathe tool, cutting force is in radial to be reduced ceaselessly, when the experiment, can choose the actor before big lathe tool, but when current part is too large, can bring about cutting tool to wear away accelerate, reduce the service life of cutting tool, the size of the horn before lathe tool is unfavorable decide too greatly, because the horn before this lathe tool takes 15 ° ～ between 19 ° ; By graph 2(e) knowable, as the accretion of the horn after lathe tool, after radial cutting force is reduced first, increase to be reduced again, overall for when the horn after lathe tool increases, radial cutting force is fluctuant inside very little scope, as a result of hind part is smaller, the attrition of knife face contacts length after bigger, and it is tatty of face of the knife after bringing about cutting blade to reach one of immediate causes, because this is below the premise that makes sure cutting tool has enough strength, the horn after lathe tool is being taken surely in the experiment when scale, can increase its to be worth appropriately, by hind the horny wave motion to radial cutting force of characteristic, cutting tool wear away influence, of the cutting tool in the experiment hind horn chooses 6 ° ～ 10 ° . Summary is a target with radial cutting force, with feed, back the cutting parameter such as the horn after the horn before speed of quantity of penetration of a cutting tool, turning, lathe tool, lathe tool is independent variable, devised orthogonal test, use AdvantEdge FEM software to emulate computation radial cutting force; Analysed each cutting parameter to be opposite the influence rule of cutting force; The extraction of each parameter when discussing an experiment to consider is worth limits. Use extreme difference to analysed a law to reach in the best combination that gives parameter of the cutting below cutting condition: Feed is 0. Quantity of penetration of a cutting tool of 1 Mm/r, back is 0. The horn after the horn before speed of 3 Mm, turning is 500 Mm/min, lathe tool is 19 ° , lathe tool is 7 ° . CNC Milling