PVD coating and not the comparative research of force of cutting of cutting tool of coating hard alloy

The chemical component that 8mm expresses 2 workpiece material (%)CMnSiSPCrMo0.

450.

660.

250.

0120.

0171.

060.

The 18 mechanical function that express 3 workpiece material succumb percentage elongation of N/mm2 of intensity N/mm2 tensile strength % shrinkage % hardness HRC105092016.

06230 graphs 1 cutting join forces and 3 to sketch map of cutting force direction 2 cutting experiment (place of experiment of 1) experiment condition uses model of 3 kinds of cutting tool to all be DNMG150608225: One kind is the hard alloy cutting tool that the brand that from tribute hard alloy factory produces is ZP25, additional two kinds are it is the matrix, hard alloy cutting tool that uses TiN of PVD method Tu Fu and TiCN coating respectively with ZP25; Parameter of cutting tool geometry sees a table 1. Workpiece material is 42CrMo steel, move qualitative processing, hardness HRC34, the chemical composition of material and mechanical sex visibility are expressed 2, watch 3. The experiment connects lathe in CA6140 general aspirant travel. (Test of 2) experiment means uses only factor method, deepness of cutting speed, feed, cutting is changed respectively when cutting experiments every time, collect to the appearance that measure power with KISTLER3, measure when experimenting every time 3 be like graph 1) to cutting force Fx, Fy, Fz(; Expand with PC386 personal computer the PCL-818L in groove board collect the imitate voltage signal of the generation in cutting change into digital signal to input the computer, repass computer shows, save, processing, the document of cutting force data that gets cutting condition falls differring reachs each 3 average to cutting force. Experiment of avery kind of all is done 3 times, in order to assure the dependability of data. In cutting process, use JCL820074 tool microscope to cutting tool wear away to have observation and analyse what different cutting tool differs to wear away form appearance. 3 tests result and analysis experiment by cutting knowable, it is Ap=0 when cutting condition.

8mm, F=0.

When 3mm/r, V=135m/min, coating of ZP25, TiCN and TiN coating of 3 kinds of cutting tool advocate cutting force is respectively 742.

4N, 654N, 644.

7N, unit cutting force is respectively 3093.

36N/mm2, 2726.

51N/mm2, 2686.

Force of 41N/mm2(unit cutting is point to unit area to go up advocate cutting force) , the cutting strength of cutting tool of visible coating hard alloy is apparent under not coating cutting tool. The test result of foreign researcher also reachs cutting tool of coating hard alloy and not the cutting force with lesserer than having photograph of cutting tool of coating hard alloy. The cutting force of cutting tool of coating hard alloy is smaller than the cutting force of hard alloy, the coefficient of friction that the coefficient of friction of the coating material that main reason is coating cutting tool and workpiece material compares hard alloy and workpiece data wants small, this can get a proof from inside following derivation. According to the cutting with wheat special fund mechanical model, the action on face of the knife before cutting tool is worn attrition force Ff and Fn of law Xiang Li, its join forces is Fr; The action on the face is cut to wear in cutting shearing force Fs and Fns of law Xiang Li; Fs and Fns2 force and Fr balance (if pursue,show) 2 times. By the graph 2 can get FX=tan(β - γ 0)FZ(1) pursues 2 wheat fund is special mechanical model is in cutting in this experiment γ of the horn before foregone cutting tool 0, repass 3 measure to the appearance that measure power FX and FZ, can use formula (1) compares angle of friction of 3 kinds of cutting tool the size of β . Is the average: of FX and FZ ratio gotten in the experiment? Storehouse? of poisonous Nao of excrement administer Lu.

48, TiCN coating cutting tool is 0.

40, cutting tool of TiN coating hard alloy is 0.

34, according to type (1) , the angle of friction of 3 kinds of cutting tool and workpiece by arrive greatly small ordinal it is cutting tool of coating of hard alloy cutting tool, TiCN coating cutting tool, TiN. The material coefficient of friction that determines in this and experiment is identical. By Li He Xie Fu (Lee And Shaffer) is formulary, have Ø+ β - 4(2) of γ 0= π because type (γ of the horn before the cutting tool in 2) 0 it is fair value, by type (2) knows, when cutting tool angle of friction β changes Xiaoshi, cut corner Ø greatens. According to above discussion, can reach 3 kinds of cutting tool are in when cutting cut corner by arrive greatly small ordinal be: TIN coating cutting tool, TiCN coating cutting tool, hard alloy cutting tool. To same kind for material, τ of its shear strength is fair value, because this cuts corner big, cut an area small instead, what need cutting power small. The cutting force data that uses only factor to the law undertakes cutting experiments and be gotten to be being measured in the experiment does further processing, the metabolic curve of force of cutting of the cutting tool when getting adoption different cutting parameter (see a picture 3, graph 4, graph 5) . Do from the graph 3 ～ pursue 5 in can you see: ? The metabolic rule that poison of Lu of administer of excrement of storehouse of Wen of bank of  of school of ぶ of commonplace of Sui Xing Ku knocks at Ap of deepness of Jun of  of  of prostitute of λ of that Xing condyle, cutting and cutting speed V and not the metabolic trend of force of cutting of cutting tool of coating hard alloy is basic and same, namely the addition as Ap of deepness of feed F, cutting, cutting force increases: As the addition of cutting speed, cutting force is reduced. Analyse its reason, because increase when feed F and cutting deepness Ap,be when, cutting area increases accordingly, accordingly total cutting force adds: And the addition as cutting speed V, cutting temperature heighten, coefficient of friction is reduced, cut horn to increase, by Zhongshan theory of power of one male cutting can be pushed derive 3 reduce to cutting force. Graph the contrast that the cutting force of 3 kinds of 3 cutting tool changes along with cutting deepness pursues the contrast that the cutting force of 3 kinds of 4 cutting tool changes along with feed pursues the contrast that the cutting force of 3 kinds of 5 cutting tool changes along with speed by the graph 3 ～ are pursued 5 still can see, no matter why be being planted,cutting condition falls, the cutting force of cutting tool of coating hard alloy under not the cutting force of cutting tool of coating hard alloy, what cutting tool of proof coating hard alloy needs cutting force to compare in cutting not what cutting tool of coating hard alloy needs cutting power in cutting small. Does experiment of 4 conclusion cutting prove: ? The metabolic law that  of す of commonplace of Sui Xing Ku condemns whetstoning  of imprison of dream of school  τ to silent bank of fine grain  wearies the cutting force of the hard alloy cutting tool of border?PVD) follows V of speed of Ap of deepness of feed F, cutting, cutting and not the metabolic rule of force of cutting of cutting tool of coating hard alloy is identical, but the cutting force of cutting tool of coating hard alloy is less than apparently not the cutting force of cutting tool of coating hard alloy: According to the result that cutting experiments, the hard alloy cutting tool that the brand is ZP25 and be the matrix, hard alloy cutting tool that uses TiN of PVD method Tu Fu and TiCN coating respectively with ZP25 3 press size sort to cutting force ordinal for: FZp25> : FTiCN> : FTiN, its are main the reason depends on the coefficient of friction between material of these 3 kinds of cutting tool and workpiece material differring. CNC Milling