A method for surface laser alloying treatment of shield tunnel boring machine hob cutter ring

A technology of laser alloying and shield tunneling, applied in metal material coating process, coating and other directions, can solve problems such as difficulty in suppressing floating or subsidence movement, and achieve the effects of low cost, high efficiency and improved service life

Inactive Publication Date: 2019-04-23
DALIAN UNIV OF TECH
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Problems solved by technology

However, this method still has certain limitations. It is difficult to suppress the floating or settling movement of nano-ceramic particles due to the difference in specific gravity with the alloy melt, so that the particles collide and aggregate with each other.

Method used

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Embodiment Construction

[0021] The technical solution of the present invention will be further described below in combination with specific embodiments.

[0022] According to 89.0% WC / Co (particle size 60-100nm), 10.0% SiC / Co (particle size 80-120nm) and 1.0% Y 2 o 3 (particle size 45-180 μ m) mass percent ratio, and then placed in a vacuum ball mill, ball milled at 200r / min speed for 10h, so that its components are homogenized. Put the mixed alloyed powder in a glass vessel, and prepare it into a paste with a mixture of absolute ethanol and shellac with a volume ratio of 100:6;

[0023] Clamp the hob cutter ring of the shield machine in a 5kW cross-flow CO 2 On the laser workbench, use 300# and 800# metallographic sandpaper to polish the knife ring in order to remove the surface oxide skin and dirt, and carefully clean it with acetone solution. Then evenly paint the alloy powder prepared into a paste on the surface of the knife ring, and the layer thickness is about 0.4mm; after the coating is na...

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PUM

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Abstract

The invention provides a method for conducting surface laser alloying treatment on a hobbing cutter ring of a shield tunneling machine, and belongs to the technical field of material surface modification. The method comprises the steps that (1) WC/Co-SiC/Co-Y2O3 alloying powder is prepared; (2) after the alloying powder is subjected to vacuum ball milling, the alloying powder is prepared into paste with absolute ethyl alcohol and lac; (3) surface laser alloying treatment is conducted on the hobbing cutter ring of the shield tunneling machine; and (4) the hobbing cutter ring subjected to alloying treatment is arranged in a batch-type furnace, subjected to heat preservation for 3-5 h at the temperature of 200-300 DEG C, and then subjected to furnace cooling. The hobbing cutter ring with an alloying layer can meet the comprehensive performance requirements of hobbing cutter rings for service under the complex conditions including strong extrusion, high torque, strong impact and high abrasion; and the technique is simple, cost is low, and efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of material surface modification, and relates to a new method for performing surface strengthening treatment on hob cutter rings of shield tunnel boring machines by adopting laser alloying technology. Background technique [0002] In recent years, in order to effectively solve urban traffic contradictions and environmental protection problems and give full play to urban functions, advanced shield construction technology has been widely used in the construction of underground projects such as subways and tunnels. Introduced shield boring machine and special cutting tool spare parts. However, due to the high strength and hardness of mountain rocks and the complexity of geological conditions, and the harsh working conditions of strong extrusion, high torque, strong impact, and high wear, the roadheader tools are the easiest tools in the tunneling process. Damaged parts are also the bottleneck that restricts th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 王存山韩立影韩程旭林国强
Owner DALIAN UNIV OF TECH
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