Alloy of magnalium of cutting of cutting tool of diamond single crystal wears away analysis

Time:2023-06-29 13:39:54
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source:LAMOND CNC Machining

Diamond has hardness tall, wearability good, intensity tall, thermal conductivity it is as good, low as nonferrous metal coefficient of friction, good to fight cohere sex and admirable corrosion resistance and chemical stability, diamond tool combines strength because of its tall, shape good, service life grows the gender, can satisfy the good character such as high speed grinding and the requirement that exceed accurate grinding technology, so, wide application received in cutting tool of machining domain diamond. In the process that processes data in diamond, the around knife face of cutting tool is contacted with workpiece ceaselessly, both between intense extruding and attrition happen in osculatory area, accordingly, there are very high temperature and pressure in osculatory area. As cutting undertake, the around knife range of cutting tool can occur gradually wear away phenomenon, make cutting ability is weakened, brought about the invalidation of cutting tool thereby. Usually, the wear process of cutting tool can differentiate by 3 phase: ① initial stage wears away level. ② wears away normally level. ③ wears away quickly level. As the accretion of dosage of cutting tool of diamond single crystal, increasing also to the analytic research of the wear out condition of cutting tool of diamond single crystal, cutting tool of single crystal of firm stone of research hair cash basically wears away mechanism has the following kinds: ① mechanical wear. ② felt wears away. ③ diffuses wear away. ④ oxidation wears away. ⑤ graphitization wears away. Magnalium alloy has taller than intensity, density small, anti-corrosive, can reclaim, thermal conductivity is good reach but Bao Bicheng wait for a lot of advantage, reach in appearance of the computer, communication, instrument, home appliance, medical treatment light industrial waited for an industry to get applied extensively. At the same time magnalium alloy belongs to soft metal, when high speed cutting, easy felt cutting tool, make its surface forms the tumour that accumulate bits, when the quality demand that should machine the surface so is higher, the requirement chooses diamond cutting tool to come cutting magnalium alloy. The research that concerns alloy of magnalium of cutting of knife of diamond single crystal domestic and internationally however is less, be opposite especially wear away the research of mechanism respect is less, and cutting tool of single crystal of this pair of diamond is very important for the soft metal such as treatment magnalium. Alloy of this anthology choose magnalium is by treatment material, it is cutting tool of single crystal of material preparation diamond with artificial complex diamond, will machine magnalium alloy, analyse the wear out condition of cutting tool, will study what diamond single crystal machines magnalium alloy to wear away mechanism. 1.

The chooses this experiment diamond of the preparation of cutting tool of diamond single crystal and magnesian aluminium alloy is bench drill science and technology (Zhengzhou) the grain of octahedral diamond single crystal that limited company grows below high temperature high pressure, its brilliant body is whole, color is buff, transparent, material is qualitative pure, can observe below 20 times microscope interior is flawless, come with Laser Cutting machine cut gets diamond odd chip, choose diamond next (100) brilliant face and (110) brilliant face, regard diamond as cutting tool respectively before the preparation material of face of the knife after mixing, the method of the solder that use drill rod assembles diamond odd chip firmly clip to be on arbor, again right the diamond cutting tool of acute of point sharp edge undertakes machining, include kibble treatment and essence to grind treatment commonly, get requires cutting tool finally. What this experiment place uses is 6061 - T6 magnalium alloy, belong to heat treatment but aggrandizement alloy, have good but weldability, but figuration sex, eletroplate gender, machining sex and corrosion resistance, have tenacity at the same time the characteristic of changeless form, moderate strength after tall, treatment, still can maintain better operation sex after anneal. 2.

Experiment (1) the cutting tool before cutting experiments is initiative form appearance. Before alloy of magnalium of cutting of cutting tool of diamond single crystal, had observation to the initiative form appearance of face of the knife before cutting tool above all. The form appearance of face of the knife before the graph shows be cutting tool of single crystal of the diamond before cutting experiments 1 times pursues. By the graph 1 knowable, the cutting blade integrality of cutting tool is good, knife face does not have tatty evidence completely before. Graph the microcosmic form appearance of cutting tool of 1 diamond single crystal (2) of alloy of magnalium of cutting of cutting tool of diamond single crystal wear away mechanism analysis. In cutting process, while cutting tool cuts redundant metal from workpiece surface, itself also is bearing to come from the intense friction that cuts bits and work, the around knife cover that causes cutting tool arises gradually wear away. When cutting tool wear extent reachs certain level, OK and apparent ground discovers cutting force is increased, cutting temperature rises, produce vibration even, bring about workpiece to machine precision to drop, exterior quality is exasperate, be about to grind a knife right now or change a knife. Visible, cutting tool wears away to have immediate effect to machining efficiency of quality, production and finished cost, it is one of very serious problems in cutting process. The graph is shown 2 times 3 900r/min, feed is in rotate speed for lathe tool of diamond single crystal for 0.

Deepness of 1mm/r, cutting falls for the craft parameter of 2mm, after alloy of magnalium of the cutting inside proper handling time, knife face wears away before the form appearance after the cutting of cutting tool of diamond single crystal of the horn before differring. 2b of graph 2a, graph and graph 2c place are shown is respectively before horn is 5 ° , 7.

5 ° and the lathe tool of diamond single crystal of 10 ° the form appearance of face of the knife before cutting hind. From the graph 2 in can observe of these 3 lathe tool before the wear awaying that knife face Dou Youming shows is taken, want to evaluate the wear extent of face of the knife before the wear out condition of cutting tool measures cutting tool with respect to need. Below same cutting condition, horn is 5 ° before, 7.

5 ° and the lathe tool of diamond single crystal of 10 ° wear away the area is respectively 0.

866 × 10-3mm2, 0.

962 × 10-3mm2 and 0.

601 × 10-3 Mm2, when so current part is 10 ° , wear extent of the cutting tool when alloy of magnalium of turning of cutting tool of diamond single crystal is lesser. (A) a knife (B) 2 knives (C) 3 knives pursue the graph of microcosmic form appearance of face of the knife before cutting hind shows cutting tool of 2 diamond single crystal 3 times the lathe tool of diamond single crystal that the horn before be is 10 ° is for 3 900r/min, feed in rotate speed 0.

Deepness of 1mm/r, cutting falls for the craft parameter of 2mm, after alloy of magnalium of the cutting inside proper handling time, knife face wears away before the scanning electron metallograph of form appearance. Can see cutting tool by graph 3a before knife face appeared to wear away nick, formed small groove; Can see by graph 3b point happened slight wear away, accompany blade having shoot and rupture evidence; Can see cutting tool by graph 3c before knife range occurred breach damaged, also have shoot blade and flake evidence. Well-known, diamond cutting tool has very strong cleavage sex, in cleavage the destruction of face happening has anisotropy, when perpendicular when drags stress to achieve diamond place solid to have some value at certain cleavage face, cutting tool will happen destroy. When composite material of cutting magnalium alloy, the aluminium alloy matrix with cutting tool soft cutting, bear hand in the stress that change, cutting vibration phenomenon is more serious, plus cut the bits puissant concussion to cutting blade, make cutting tool bears greater concussion stress. When cutting tool point local district stress achieves his when brittleness cleavage intensity, produce tiny brittleness to flake. Once cutting tool happening flakes, cutting blade will no longer level off, flake be in concentration of easy generation stress, cause the collapse blade of chunk material thereby. By the graph 3 can see, magnesium of cutting of cutting tool of diamond single crystal did not produce graphitization when aluminium alloy, because,this is 6061 - the content of copper coin element in T6 magnalium alloy is only 0.

3% , can't cause apparent dip corrode to cutting tool thereby. By the graph 3 knowable, this kind of circumstance explains cutting tool produced apparent mechanical attrition to wear away. Because the mechanical attrition between diamond cutting tool and workpiece is caused,it is. In the initiative phase of diamond cutting, the microcosmic interface of diamond cutting tool and workpiece is rough, form crisscross, in opposite campaign process, bilateral height is ground to make the same score gradually. When cutting is machined, the hard particle that contains in workpiece material and fragment of the tumour that accumulate bits in cutting tool apparently grain of lay off channel and cause wear away. 3.

Knot radical occupies what the horn before differring to cutting tool of diamond single crystal falls to wear away the observation of form appearance, when cutting tool of diamond single crystal machines magnalium alloy, the point of cutting tool happened slight wear away, accompany blade having shoot and rupture evidence, of cutting tool before knife face appeared to wear away nick, formed small groove, produced breach damaged, those who show cutting tool is main wear away the form is mechanical attrition wears away. Bibliographical reference: [Shellfish of 1] Zhang Bei.

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