Research of mechanism of GH4169 of turning of round razor blade of pottery and porcelain and craft are optimized

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As the rapid development of industry of our country national defence, aerospace, the difficult treatment material such as high temperature alloy, titanium alloy is in the application of these domains is wider and wider. High temperature alloy is the material that still can work for long below the 600~1200 ℃ high temperature, condition that holds admirable and mechanical property, and can bear complex stress. This material has good mechanical exhaustion and hot fatigue property, also have good plasticity and concussion tenacity. But high temperature alloy belongs to difficult treatment material, if conditional choice is undeserved,be in in cutting treatment process, easy occurrence cutting tool has worn away quality of fast, treatment is poorer wait for a problem [1] . Because have good cutting stability, brilliant must add razor blade of pottery and porcelain of pliable but strong to receive wider and wider application in the cutting of high temperature alloy. But a kind of when regard cutting high temperature as alloy new-style cutting tool, its cutting mechanism has not gotten be elaboratinged adequately. For this, the article carries the research of cutting mechanism, reached the optimal craft condition of alloy of high temperature of cutting of cutting tool of pottery and porcelain. The alloy of material attribute high temperature of high temperature alloy and cutting tool of pottery and porcelain basically divides the Jigaowen that it is iron alloy of alloy, cobalt radical high temperature and alloy of nickel radical high temperature, among them the application with alloy of nickel radical high temperature is most wide. The bases of material of alloy of nickel radical high temperature is nickel, it is with GH4169 exemple, the content of its nickel is 50%~55% , main element has the rest Fe, Cr, Nb [2] . The cutting tool material of alloy of cutting high temperature is coating and blame coating hard alloy more now, but put in more question, for instance cutting tool wears away serious [speed of 3] , general cutting under 100mm/min[4] . Cutting tool of pottery and porcelain wears away capability is stronger, thermal stability is good, be in especially 1200~1400 ℃ , hardness still can achieve 80HRA[5] , its fight tatty ability to comparative, bending strength is stronger, and the value is relatively inferior, the sexual price of cutting tool of pottery and porcelain is compared some taller. High temperature alloy is right of cutting tool wear away main show wears away depression for crescent moon [6] , of cutting tool of pottery and porcelain fight crescent moon depression tatty capability is stronger. System of test of alloy of high temperature of turning of razor blade of pottery and porcelain studies if the graph is shown 1 times,turning test site is decorated originally. Lathe model is CA6140, the measurement of cutting force uses Kistler 9275B 3 measure power instrument to the type that suppress report, the measurement of exterior surface roughness uses MITUTOYO SV-3000 measuring instrument. Graph brand of alloy of high temperature of material of workpiece of spot of 1 testing stand is GH4169, cutting tool is the round razor blade of pottery and porcelain of RNGN120700S-WG-300 for model of American greenery firm, if pursue,2 are shown. Graph round razor blade of 2 pottery and porcelain to drop cutting temperature, lengthen cutting tool life, improvement lubricant condition [7] , this experiment uses drop lubricant cutting (MQL) support system, equipment is shown 3 times like the graph. Graph method of experiment of Nextpage of system of refrigeration of 3 steam mist and test data analyse the article to carry sheet of turning of high temperature alloy element experiment and orthogonal experiment, to surface roughness of cutting force, surface and cutting tool wear away undertook study. The only factor that experiment of only factor of 1 turning GH4169 studies to undertake parameter of turning GH4169 cutting above all experiments, to its cutting mechanism undertakes study, the cutting speed of the experiment is 162m/min, 170m/min, 215m/min, 272m/min, cutting deepness is 0.

15mm, 0.

25 M /mm, 0.

30m M, 0.

35mm, feed is 0.

05mm/r, 0.

08mm/r, 0.

14 Mm/r, 0.

18mm/r. (1) the cutting speed influence to cutting force and exterior surface roughness. Graph 4 be opposite for cutting speed the influence of cutting force, when cutting rate increases, cutting force is reduced above all; Increase of speed further as cutting, after cutting force reachs fair value, begin to increase. Because become when cutting rate is minor, cutting area is out of shape adequately, cutting power is right now so greater; When cutting rate increases, when cutting area did not produce metabolic before cutting blade can be passed, so cutting force is reduced; When cutting rate increases further, inevitable meeting causes cutting tool - the oscillatory addition of workpiece system, the stability of cutting is reduced, so cutting force adds. Exterior surface roughness increases as the addition of cutting speed, if the graph is shown 5 times, when because become,cutting rate increases, the vibration influence to exterior surface roughness. In the meantime, cut slippage to become as the addition of cutting speed cut tear off, these two elements make exterior surface roughness is worth urgent leap to add. (2) the cutting deepness influence to cutting force and exterior surface roughness. Graph 6 with the graph 7 be opposite for cutting deepness cutting force and curve of influence of exterior surface roughness, cutting tool of this kind of pottery and porcelain is the horn before losing, and cutting blade form is lose edge, cutting treatment is to cut slippage course personally originally, be in so cutting when, the metal that is about to machine has a dispenses to lose arris plane to connect touch, because high temperature alloy belongs to plasticity material, this part metal produced billabong, one part metal as cut bits to pour out of, another part stays in the workpiece surface that is machined, produce the effect fighting force to cutting tool, and exterior quality is bad, exterior surface roughness is taller. When cutting deepness is lesser, be compared by the metallic layer of billabong and the quality that cut bits big, the metal that cuts bits to take away is less, cutting power is so greater, exterior surface roughness is poorer; When cutting deepness is increased, the metal that cuts bits to take away is opposite grow in quantity, cutting force can have descendent tendency, exterior quality rises. But when cutting deepness reachs fair value, cutting force was reduced no longer, when the purify amount because of the metal is too large, axial cutting force can add apparently, bring about exterior quality to become poor. (3) feed pursues to the influence of cutting force and exterior surface roughness 8 with the graph 9 it is feed the influence to cutting force and exterior surface roughness. The change of feed is not big to the influence of cutting force, as a result of,this is when the addition of feed, change of area of width of cutting ply, cutting, cutting and metallic purify rate is not big. But when feed increases, added the space of the exterior cutting grain of work look adjacent, make the surface of cutting treatment roughs, solid surface surface roughness is worth greaten. The optimal cutting parameter that experiment of orthogonality of Nextpage2 turning GH4169 studies to use orthogonal experiment design to decide turning GH4169. If test data expresses 1 to show. According to the experiment eventuate that orthogonal experiment gets: To cutting force, cutting speed and cutting deepness impact are bigger, and the influence of feed is minor; To exterior surface roughness character, with cutting 3 element have more obvious concern. Consider cutting force and exterior surface roughness integratedly, and the test result of experiment of geometrical only factor, can get the best cutting parameter of GH4169 of vehicle of fine of round razor blade of WG300 pottery and porcelain. Namely cutting speed span is 250 ～ 290mm/min, cutting deepness span is 0.

25 ～ 0.

30mm, feed span is 0.

08 ～ 0.

11mm/r. 3 cutting tool wear away reach damaged form analysis to use KEYENCE to exceed depth of field three-dimensional and microscopical systematic VHX-600, watch the pattern of round razor blade of WG-300 pottery and porcelain, study the invalidation form of razor blade of pottery and porcelain. The radial cutting power when alloy of high temperature of cutting of cutting tool of pottery and porcelain is very great, high temperature alloy sticks a knife easily, bring about cutting tool hind knife face sticks knife phenomenon very apparent, because the thermal conductivity of high temperature alloy is poor, the heat in metal cutting of the generation when cutting cannot better come loose from inside cutting tool piece, of face of the knife after be being brought about not only wear away very serious, and make make the material of face of the knife after cutting tool falls off easily. Graph 10 in what A and B place show is the bit of pottery and porcelain that had not used, of face of the knife after C is wear away configuration, material of cutting tool of face of the knife after E is is agglomerate fall off configuration. Hind the attrition of knife face and workpiece is too big, and cannot from hind knife face comes loose an a large number of quantity of heat, make the temperature of cutting blade elevatory. And lose arris to go up to ceaselessly the metal has delimited, knife face was in blade of easy generation cutting once upon a time collapse blade, if pursue 10 in D place is shown; Attrition temperature lifts and perhaps make cutting blade temperature exorbitant, and the trace that calcination appears on advanced knife face, if pursue 10 in F place is shown. Last word (1) the experiment research that carries GH4169 of alloy of high temperature of turning of round to WG-300 pottery and porcelain razor blade, got cutting parameter reachs the influence of exterior surface roughness to cutting force. Along with the addition of cutting speed cutting force is reduced first again elevatory, exterior surface roughness shows elevatory trend; Increase cutting force to reduce as cutting deepness, and after exterior surface roughness is reduced, increase; Feed increases, not apparent to the change of cutting force, and exterior surface roughness increases quickly. (2) the result that experiments through analysing orthogonal experiment and only factor, reached limits of parameter of cutting of first-rate of GH4169 of vehicle of fine of round razor blade of WG-300 pottery and porcelain, namely cutting speed span is 250~290mm/min, cutting deepness span is 0.

25~0.

30mm, feed span is 0.

08~0.

11mm/r. (3) of GH4169 of turning of high speed of round razor blade of WG-300 pottery and porcelain wear away reaching damaged form is hind knife face wears away reach cutting tool material to fall off, blade of cutting blade collapse, before knife face burn. CNC Milling CNC Machining