Cutting tool of the cermet when mill of car of dry type high speed wears away mechanism research

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Summary: Of cutting tool of the cermet when considering to do steel of D60 of mill of car of type high speed wear away mechanism and wear away characteristic. Pouring and as cooling as water-solubility cooling fluid wet photograph of interconnected system of high speed car is compared, when steel of D60 of mill of car of dry type high speed, cermet cutting tool has taller wearability. Horniness photograph the desquamation that pull is tatty of cutting tool of the cermet when steel of D60 of mill of car of dry type high speed main reason. Cutting of 1 foreword high speed machines the treatment efficiency that improved a spare parts significantly not only, and can make the treatment precision of workpiece and exterior quality reach higher level, it is the significant progress way that machinery makes a field. Processing technique of high speed Che Xi is replace lathe tool with milling cutter, rotate to rotate to realize a kind of of cutting of high speed of swing tower spare parts advanced processing technique with cutting tool high speed through workpiece. When cutting, workpiece does not want high speed roll. Because this is large to coming true,the high speed with workpiece of thin wall swing tower, accurate treatment has distinctive sense more. In addition, treatment of mill of high speed car is discontinuous cutting, each razor blade in cutting tool every turn medium actual cutting time won't exceed 1/Z(Z to count) for mill tooth. Be not cutting phase, bit is attainable effective refrigeration, be expected to realize the high speed cutting of swing tower spare parts below dry cutting condition, be helpful for realizing green to make. But steel of mill of car of the high speed below dry cutting condition kind work style has a lot of problems to remain to study at giving from theory and experiment. To turning treatment, construction of system of main shaft chuck complex, bulk bigger, dynamic balancing relatively milling main shaft wants difficulty much, of cutting speed rise be restricted certainly. And in steel of high speed turning kind when the spare parts, face of the knife before high temperature cuts bits edge gives even follow on current, cutting area temperature is high, cutting tool wears away extremely easily. For this, we choose to machine the cermet cutting tool with can admirable neutral in rolled steel cutting, had test of mill of high speed car, to its when cutting D60 steel wear away character and wear away mechanism undertook study. Graph machine tool of mill of car of orthogonality of 1 high speed is local experiment of 2 tests equipment and Che Xi of experimental condition high speed is in the photograph the high speed that change one's costume or dress undertakes on Che Xi machine tool, use means of orthogonal car mill, if pursue,1 is shown. Machine tool of mill of high speed car lathe of the S3-1200-1 that 3 factories produce numerical control changes his costume or dress and become by Shenyang machine tool, milling cutter by main shaft of high speed report direct drive, use frequency control, timing scope is 0 ～ 18000r/min. Appearance of form of cutting tool surface observes an analysis by scanning report lens, appearance measures the TR100 that workpiece surface surface roughness produces with Beijing times company surface roughness. Razor blade of the PL530 that experiment of mill of high speed car produces for Sandvik company with bit cermet (it is with TiC and TiN base) , ° of Kr=90 of tool cutting edge angle, deputy slant horny Kr=0 ° . The experiment is D60 steel with workpiece material, the content of the element such as its carbon, manganese, silicon and steel of structure of element of 60 high grade carbon are basic and identical, but content of sulfur, phosphor is more than steel slightly. Is the experiment: with cutting dosage? Zuo of ぜ   is versed in =15r/min, ap=0.

5mm, f=0.

=5000r/min of knife of N of rotate speed of cutting tool of Ø150mm; of 5mm/r; workpiece diameter, (Corresponding cutting speed is 392.

5m/min); cutting is milling of the car that go against type, in pouring without cooling fluid cutting test has below cooling dry type condition. 3 tests result and analytic test result make clear, cutting tool of the cermet when steel of D60 of mill of car of dry type high speed wears away face of the knife after configuration basically is wears away, wear away area exterior configuration submits hump form. Before there is what agree with direction of the flow that cut bits to grind mark on knife face, but arise without small collapse on edge. Cutting tool wears away configuration is shown 2 times like the graph. (Face of the knife after A) (face of the knife before B) pursues cutting tool of the cermet when steel of D60 of mill of car of high speed of 2 dry type wears away configuration pursues the wear curve of cutting tool of the cermet when steel of D60 of Che Xi of high speed of 3 dry type looks from experimental result, pouring and cooling condition issues water-solubility cooling fluid, when steel of D60 of mill of high speed car, through the cutting of 18min, wear extent of face of the knife after cermet cutting tool, VBmax is amounted to 0.

55mm. And when steel of D60 of mill of car of dry type high speed, through the cutting of 160min, VRmax of knife face wear extent is amounted to after 0.

5mm, wearability relatively water-solubility cooling fluid is pouring and cooling wet high speed Che Xi should be gotten high much. Wear curve is like face of the knife after the cutting tool when steel of D60 of mill of car of dry type high speed the graph is shown 3 times. Wear away with the cutting tool below groovy cutting speed the pattern is similar, cutting tool wear process wears away by initial stage, wear away normally reach acuteness wear away 3 phase composition. Microscope observation makes clear, wear away in initial stage level, face of the knife after cutting tool wears away evener, wear extent, the Old Testament is 0.

03mm. In wear away normally and acuteness wear away level, knife face wears away after area exterior presents hump look gradually, and direction of edge cutting speed is formed more wear away channel mark. Scanning report lens wears away to face of the knife after cutting tool the observation of the area makes clear as a result, after knife face wears away the area has micro-crack to exist, if pursue,4 are shown. But with wet high speed Che Xi is compared, when mill of car of dry type high speed hind knife face wears away area micro-crack distributinging density wants low much. Because work type high speed,this is when Che Xi, although wear away in cutting tool,area surface layer is mixed as a result of process of cutting tool cutting the temperature change existence after be being cut is high frequency hand in heated stress, but cutting tool wears away change of temperature of area surface layer is far under wet the temperature when cutting changes. So when 10 type cutting, what action provides surface layer at the knife is high frequency hand in heated stress lesser. Accordingly, wear away in cutting tool the crackle extent that the area forms and distributinging density is lesser. Graph face of the knife after 4 cermet cutting tool wears away after 5 horniness photograph falls off, the micro-crack graph of the area wears away in cutting tool the tiny indentation that the surface forms from the graph 4 can see, photograph of the horniness in the width grinding mark of direction of speed of cutting of edge of face of the knife after cutting tool and cutting tool (comparative like TiC) particle size. Farther, we fall in condition of tall enlarge multiple to wearing away with scanning report lens area surface has observation, discovery is in wear away the tiny indentation that area surface has a large number of horniness to grain falls off and stay, if pursue,5 are shown. When steel of D60 of mill of car of dry type high speed, although cutting phase temperature is not to have in bit,drop certainly, but because cutting tool rotate speed is high, blame cutting time is very short, because this razor blade is in the average temperature in whole cutting process is higher. Below high temperature condition, the felt photograph Ni in cermet razor blade, Co produces bate, its drop to the bonding strength of horniness photograph, in cutting process, as a result of the action of mechanical attrition force, horniness photograph falls off and cause cutting tool to wear away. In addition, of university of industry of Japanese gold feet the tests of 1000 high speed turning that De Ying ever used cermet cutting tool to had undertaken steel with the cutting speed of 300m/min, think tatty of face of the knife before cermet cutting tool is main the reason is thermal diffusion wears away. Can think, do cutting of mill of car of type high speed, in cutting tool as a result of each razor blade every turn in do not exceed 1/Z to workpiece cutting time, because the Fe Xiang Dao in this workpiece material provides surface layer to diffuse, or element of cutting tool surface layer to the workpiece, possibility that in cutting bits, diffuses not quite. But because depend on the razor blade in the cutting process of steel of D60 of mill of car of the high speed below type condition average temperature is higher, long when cutting, photograph of felt of the layer in bit can diffuse to the surface, be taken away in follow-up cutting process, this also is to create appearance of horniness of cutting tool surface layer bonding strength drops and one of reasons that horniness photograph grain falls off. When 4 conclusion do steel of D60 of mill of car of type high speed, of cermet cutting tool basically wear away configuration is hind knife face wears away. When steel of D60 of mill of car of dry type high speed, the wearability of cermet cutting tool relatively water-solubility cooling fluid is pouring and cooling wet high speed Che Xi should be gotten high much. In cutting process, as a result of felt photograph bate, create horniness appearance bonding strength drops to fall off then is cutting tool tatty main reason. CNC Milling