Nitrogen changes carbolic coating cutting tool to do the research of cutting function

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Nitrogen changes carbon (C3N4) it is to go up the century just appears at the beginning of 90 time exceed hard data. The person such as Cohen of 80 time later period passes theoretical calculation prophecy, similar β - the compound of Si3N4 structure -- β - C3N4 may have the hardness that exceeds diamond, this says to cause the wide attention of domestic and international researcher instantly. Niu announced to obtain β with laser ablation law above all 1993 - C3N4 is filmy, subsequently researcher uses an electron whirly resonance, deposit of chemical gas phase (ECR, CVD) , magnetism of heater CVD, reaction accuses to splash shoot waited for a method to synthesize nitrogen successfully to convert carbolic film.  Wuhan university studies since 1994 nitrogen changes synthetic method of carbon. Accuse to splash with radio frequency CVD, magnetism early or late shoot waited for a method to synthesize nitrogen successfully to convert carbolic film, researched the plated film technology that nitrogen changes carbolic film to go up in high-speed steel. The experiment proves, the bit that plating has nitrogen to change carbon is compared not coating broach life raises 25 times, the broach life that spends titanium than plating nitrogen raises 3 times. Because nitrogen changes the thermal stability of carbon with exceed rigid, better and the low endophilicity with Fe element, make nitrogen changes carbolic coating cutting tool to have hardness tall, fight wear away ability and thermal stability are good wait for an advantage, make cutting tool of idealer dry type cutting. The article changes carbolic coating lathe tool to undertake doing the research of cutting function with respect to the nitrogen of the YT15 matrix of Wuhan university preparation.  1. Two of the cutting tool of coating of face of characteristic  horniness that nitrogen turns carbolic coating cutting tool main index are the adherent force of the hardness of coating and coating, and the coating hardness that nitrogen turns carbolic coating cutting tool is the key that improves cutting tool life. Next watches are the comparison of hardness of a few kinds of material, can see from inside the watch, nitrogen changes carbolic hardness to be next to diamond, have larger dominant position. The nitrogen of the YT15 matrix of Wuhan university preparation changes carbolic coating lathe tool to pass the nick of key laboratory of state of modified of material of college of place of physics of Lanzhou of the Chinese Academy of Sciences and Dalian grain industry to experiment, of coating microscopical hardness is as high as HV=72.

04GPa, the adherent force LC=30 of coating.

87 ～ 52.

14N, achieve JB/T8365, the regulation of 96. The hardness that expresses all sorts of material compares high-speed steel - ～ of hard alloy HRC62 66 - 81 high-speed steel of HRC74 ～ - hard alloy - TiN - cubic nitrogen changes boron - diamond - nitrogen changes carbolic HV8 ～ 9 - HV13 ～ 18 - HV21 - HV47 - HV800 - HV502. The nitrogen of  of cutting treatment function that nitrogen turns carbolic coating cutting tool turns the cutting performance that performance of the chemistry with carbolic special coating, physics decided its are admirable. Reach with silicon aluminium alloy below quench the cutting treatment of 45 steel is voice exemple, study what its machine function and cutting tool to wear away the rule.  2. 1 nitrogen changes carbolic coating cutting tool to do cutting silicon aluminium alloy  experiment condition is dry type cutting, be by treatment workpiece car piston, material is in all brilliant aluminum-silicon alloy (code name ZL108, brand ZALSi12Cu2Mg1) , comparative cutting tool is diamond coating cutting tool and cutting tool of YG6 hard alloy. Cutting parameter is Vc=400m/min, ap=0.

4mm, f=0.

1mm/r, experiment index is exterior surface roughness Ra value and cutting tool life. Test result: (1) surface surface roughness: Diamond coating is Ra=0.

64, nitrogen changes carbolic coating to be Ra=0.

78, YG6 hard alloy is Ra=0.

90; (2) nitrogen changes the life of carbolic coating cutting tool and diamond coating to comparative, it is the 10 times above of YG6 hard alloy.  discovers in the experiment, nitrogen turns carbolic coating cutting tool to aluminium alloy fight stick receive cutting tool of coating of function excel diamond. The contrast of photograph of the tumour that accumulate bits that turns carbolic coating cutting tool from diamond coating cutting tool and nitrogen can see, what nitrogen turns carbolic coating and aluminium alloy is close add up to a gender bad. 2.

2 nitrogen change carbolic coating cutting tool to do cutting to quench condition of steel  experiment is dry type cutting, material of the workpiece that be added is quench voice 45 carbon steel, hardness is 54HRC. Comparative cutting tool is not cutting tool of coating YT15 hard alloy. In the experiment, when cutting speed achieves 90m/min, YT15 cutting tool misfires, accordingly, comparative experiment chooses two groups: Vc=60m/min, f=0.

1mm/r, ap=0.

4mm; Vc=40m/min, f=0.

1mm/r, ap=0.

4mm. Test result: Should wear away the standard is VB=0.

3mm, when Vc=60m/min, the VB=0 after YT15 works 9 minutes.

33mm, nitrogen changes the VB=0 after carbon works 15 minutes.

32mm; When Vc=40m/min, the VB=0 after YT15 works 10 minutes.

35mm, nitrogen changes the VB=0 after carbon works 30 minutes.

32mm. 2.

3 nitrogen change cutting of carbolic coating cutting tool to quench of steel wear away mechanism  nitrogen changes carbolic coating cutting tool and not the distinction of coating cutting tool depends on: Because cutting tool surface has nitrogen to change carbolic coating, have special physics, chemistry and mechanical property, and matrix is YT15 hard alloy, because this cutting tool has tall hardness, tall hear resistance and tall wearability already, have the tenacity of hard alloy again, the hard alloy with general excel of its cutting function, suit to process data of tall hardness difficult treatment, the thermal conductivity with the thermal stability of coating and good at the same time hard alloy makes its suit to do type cutting and treatment hardness to be the material of 50HRC ～ 60HRC. In  cutting experiment, nitrogen changes in advance of carbolic coating cutting tool to wear away very small, after period of time, collapse of face of the knife before cutting tool is broken. In whole cutting process the attaint of cutting tool is given priority to with damaged. If make conclusions,from above the analysis can reach:  (1) cutting tool matrix should contain the WC of 79% , the TiC of 15% and the Co of 6% , according to afore-mentioned analysises knowable, the content of WC, TiC and Co is apparent on the low side, especially the content of Co receives the content that is bordering on YT30 almost, because the cutting tool when this cutting becomes fragile, wear away to basically be given priority to with damaged. The content of Co is reduced concern as high as the temperature when cutting, high temperature makes of Co diffuse aggravate, diffuse to be taken away by scrap to the Co of cutting tool surface, make matrix loses Co, make cutting tool brittleness increases thereby;  (2) bits is cut when cutting temperature is higher oxidation is serious, from wear away exterior composition analysis also can prove this. Cutting tool surface contains oxygen 31.

62% , contain iron 6.

58% , advocate if fused iron and ferric oxide conglutinate are in,wear away exterior be caused by. From the point of cutting process, below such cutting speed, temperature is extremely high, cutting tool of common YT15 hard alloy is impossible to use, and nitrogen changes carbolic coating cutting tool to be able to be machined all the same, as a result of coating special physics and chemical function decide this, as coating wear away, matrix is bare cutting tool wears away very quickly;  (3) fall in high temperature, once coating wears away, the Co in cutting tool to workpiece, those who cut bits diffuse aggravate, because cutting tool is stuck receive decrease, brittleness increases, on the other hand workpiece and the Fe Xiang Dao in cutting bits provide diffuse also aggravate, diffuse to will form look of new low hardness brittleness to the Fe in cutting tool, bring about function of cutting tool whole to drop, make cutting tool wears away aggravate.  3.

The tall hardness sex that nitrogen turns foreground of carbolic cutting tool to because nitrogen changes place of carbolic coating cutting tool to have,look into  and cutting tool create the flexibility that go up, it can replace partial grinding, improve work efficiency, still can replace partial other cutting tool and treatment method, cost of managing cutting tool, managing specific power consumption; A few large work need to change a knife in treatment process middling, the influence machines precision, and because have good wearability and hardness,nitrogen turns carbolic coating cutting tool, the time that change a knife is less, can assure to machine precision; What reach craft as coating technology is ceaseless and perfect, nitrogen changes the production lot of carbolic coating cutting tool, cutting tool of this kind of new-style coating will bring new lease of life to machining, have wide applied perspective. CNC Milling