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

A kind of wear-resistant coating and coating technology, which is applied in the direction of coating, metal material coating technology, mining equipment, etc., can solve the problems of difficult to effectively improve the wear resistance of the knife ring, local stress concentration, large thermal stress, etc., to achieve Inhibit the initiation and propagation of cracks, improve the degree of uniform distribution, and the effect of uniform distribution of hard phases

Active Publication Date: 2019-11-19
CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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preparation example Construction

[0050] The preparation method of wear-resistant coating 1 provided by the present invention comprises the following steps:

[0051] (a) Coating the solder mixture of diamond micropowder, alcohol solvent, sodium fluoride and nickel-based solder on the surface of the substrate, drying the solder mixture to lose moisture, and using a laser to Scanning the dried solder mixture, after the solder is melted and spread, realizes metallurgical bonding with the substrate to obtain the solder coating 2;

[0052] (b) optionally repeating step (a), such as figure 1 Shown, until the desired thickness of wear-resistant coating 1 is obtained.

[0053] The preparation method of a wear-resistant coating 1 provided by the present invention adopts the laser spot as the heat source, has the advantages of fast heating rate, small heat-affected zone of base material and diamond, etc., and will not cause excessive thermal damage, and the coating No heat treatment is required after preparation, and ...

Embodiment 1

[0066] The preparation method of the wear-resistant coating 1 provided in this embodiment specifically includes the following steps:

[0067] A. Calculated in parts by mass, weigh 3 parts of diamond micropowder (200-325 mesh), 3 parts of terpineol, 1 part of sodium fluoride and 93 parts of BNi-2 solder powder (200-300 mesh), mix well , stir, and prepare the paste solder mixture for subsequent use;

[0068] B. Coat the paste solder mixture evenly on the working surface of shield hob cutter ring 3, control the thickness to 0.7mm, cool and dry, put it in a drying oven, and dry it at 100°C for 1.5h, dry the coating Moisture inside the layer;

[0069] C. Fix the dried shield hob cutter ring 3 on the high-temperature-resistant bracket, supplemented by argon as the protective gas, and use CO with a diameter of 15mm 2 The laser spot is the heat source, and the scanning speed is 380mm / min to quickly scan the dried solder mixture, the coating solder melts and spreads, and realizes met...

Embodiment 2

[0072] The preparation method of the wear-resistant coating 1 provided in this embodiment specifically includes the following steps:

[0073] A. Calculated in parts by mass, weigh 4 parts of diamond micropowder (200-325 mesh), 4 parts of terpineol, 2 parts of sodium fluoride and 90 parts of BNi-2 solder powder (200-300 mesh), and mix thoroughly , stir, and prepare the paste solder mixture for subsequent use;

[0074] B. Coat the paste solder mixture evenly on the working surface of the shield hob cutter ring 3, control the thickness to 0.6mm, cool and dry, put it in a drying oven, and dry it at 90°C for 1.5h, dry the coating Moisture inside the layer;

[0075] C. Fix the dried shield hob cutter ring 3 on the high-temperature-resistant support, supplemented by argon as the protective gas, and use CO with a diameter of 13mm 2 The laser spot is the heat source, and the scanning speed is 230mm / min to quickly scan the dried solder mixture, the coating solder melts and spreads, an...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10E21D9/08
CPCC23C24/103E21D9/08
Inventor 龙伟民钟素娟黄俊兰张雷秦建路全彬丁天然薛行雁
Owner CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
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