Wear-resistant coating and preparation method thereof, cutter ring of shield hobbing cutter, shield hobbing cutter and shield tunneling machine

Abstract

The invention provides a wear-resistant coating and a preparation method thereof, a cutter ring of a shield hobbing cutter, the shield hobbing cutter and a shield tunneling machine. The wear-resistantcoating comprises at least two brazing filler metal coatings basically identical in structure. Each brazing filler metal coating comprises, by mass part, 3-10 parts of diamond micro-powder, 2-6 partsof an alcohol solvent, 1-5 parts of sodium fluoride and 81-93 pars of nickel-based brazing filler metal. According to the wear-resistant coating, a gradient transition coating is formed by the multi-pass basically identical thin coatings, the thermal stress problem generated when a thick coating is prepared through a surfacing welding method is relieved, and initiation and extension of cracks areinhibited to a certain degree; and meanwhile, the uniform distribution degree of the hard phase diamond micro-powder can be improved, and the advantages of being small in thermal injury, uniform in hard phase distribution and not likely to fall off are achieved. According to the shield hobbing cutter, the surface of the cutter ring is coated with the wear-resistant coating, the wear resisting performance of the cutter ring is effectively improved, and the service life of the cutter ring is prolonged.

Description

technical field [0001] The invention relates to the field of engineering equipment surface treatment, in particular to a wear-resistant coating and a preparation method thereof, a cutter ring of a shield hob, a shield hob and a shield machine. Background technique [0002] The shield hob is a kind of shield machine tool, which plays the role of advancing "forward" during construction. The shield hob consists of a cutter ring and cutter teeth. The knife ring generally uses alloy steel as the base material, and the knife teeth are brazed or inlaid cemented carbide. The tungsten carbide cutter teeth play the role of rolling and cutting rock and soil, and the cutter ring supports and protects the tungsten carbide cutter teeth. Affected by random changes in soil conditions and groundwater pressure, with the continuous advancement of construction and the continuous rotation of the cutter head, the shield hob is subjected to continuous and changing forces such as extrusion, jacki...

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Problems solved by technology

[0004] However, the existing shield hob cutter ring coating has the following problems: the wear-resistant coating of the cutter ring is prepared by the surfacing welding method. Although a thicker coating can be prepared, the heat output of the surfacing welding is large, and the thermal stress after the surfacing welding is large , it is easy to produce cracks, and it is easy to expand into the base material and cause the cutter ring to break; at present, the commonly used coating hard phase is mostly large-grained carbide or cemented carbide, and the coating is uneven, which is easy to produce local stress concentration and micro Cracks cause the hard phase of large particles to break or fall off during the working process; the wear-resistant coating is prepared by the conventional brazing method. Although the thermal stress is small, the prepared coating is very thin and the hard phase in the coating is uniform. The degree of cloth is low, and the wear resistance of the knife ring is difficult to effectively improve

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