Coal winning machine cutting tooth's body wear-resisting performance study

Coal winning machine cutting tooth the Carbide Buttons Carbide Tips tooth body wear-resisting performance study
Pick because of its bad working environment, each with 10000 tons of coal mining pick 400 ~ 1300, China's current annual output of about 1.2 billion tons of coal, so as the coal mining machine parts, the demand is very big. The tooth body parts of the cutter tooth system abrasion failure accounted for its overall 45 ~ 50%. Because of its large consumption, so if can improve wear resistance of cutting tooth, will generate huge economic benefits.

Aiming at the failure problem of coal winning machine cutting tooth wear, use a variety of chemical heat treatment to strengthen treatment of 40 crnimo tooth material, carbonitriding layer analysis (XRD), scanning electron microscopy, and wear resistance test, and strengthen the specimen, ultimately determine the best treatment, and discusses the tooth body wear mechanisms.

(1) the permeability resulting from the gas carburizing layer thickness is about 1.3 mm, carbide dispersion distribution, dispersion strengthening effect on substrates.

(2) in boronizing agent formula is 52% old boronizing agent + 35% KBF FeB + 5% + 5% rare earth oxides (CeO), boronizing process for 930 ℃ x 8 h, mainly for Fe2B boronizing layer, the final boronizing layer thickness is about 123 microns, the average microhardness is about HV1518.6.

(3) in seepage niobium agent formula is 50% niobium iron + 32% NH_4Cl AL_2O_3 + 10% + 10% rare earth lanthanum oxide (La_2O_3), seepage niobium process for 990 ℃ x 7 h, niobium layer phase mainly for NbC, the thickness of the final niobium layer is about 10 microns, the average microhardness is about HV2770.

(4) under simulated conditions of cutting tooth wear, wear-resisting performance from big to small in turn for carbon and niobium composite permeability, carbon - boron compound permeability, carburizing, chemical heat treatment improved sample. Pick sample of abrasive wear is the main failure forms, the ways we wear for cutting and furrows.

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