Abstract
As H13 steel is a common material for cutters of Tunnel Boring Machine (TBM), the research on surfacing remanufacturing performance is of great value. In this paper, the phase composition of the surfacing layer of H13 steel after gas metal arc welding (GMAW) was analyzed by exploring the precipitation of hard phase in the molten pool, and the microstructure evolution of the surfacing layer was revealed. Then, we carried out simulation modeling analysis on H13 steel surfacing remanufacturing. Results show that: (1) the surfacing layer is combined with the base metal by physical metallurgy without obvious defects such as pores, inclusions and cracks in the surfacing layer; (2) the hardness of the surfacing layer is 60 HRC, which is about 1.5 times of that of the base metal; (3) the stress is mainly concentrated in the arc starting and ending points, followed by the external constraints on both sides of the surfacing layer; (4) the deformation of surfacing layer is slight, which does not affect the forming quality of base metal, while the deformation of base metal is relatively severe. This paper verifies the feasibility of H13 steel remanufacturing from experimental and simulation, providing theoretical basis for future engineering practice.
Highlights
During the tunneling process of the tunnel boring machine, the blade ring of the disc-shaped hob directly cuts the rock, resulting in severe wear failure behavior of its edge
The construction cost caused by cutter ring failure accounts for more than 1/3 of the total construction cost [1]
In order to improve the comprehensive cutting performance of the hob and reduce the maintenance cost of the cutter ring, the industry has carried out a lot of research work from the aspects of material smelting of cutter ring, preparation and processing technology, wear-resistant coating protection, efficient auxiliary rock breaking technology, and cutting parameter optimization [2,3], etc
Summary
During the tunneling process of the tunnel boring machine (hereinafter referred to as TBM), the blade ring of the disc-shaped hob (hereinafter referred to as the hob) directly cuts the rock, resulting in severe wear failure behavior of its edge. In order to improve the comprehensive cutting performance of the hob and reduce the maintenance cost of the cutter ring, the industry has carried out a lot of research work from the aspects of material smelting of cutter ring, preparation and processing technology, wear-resistant coating protection, efficient auxiliary rock breaking technology, and cutting parameter optimization [2,3], etc. In view of the advantages of the abovementioned surfacing welding and the actual radial wear volume of the cutter ring, complex working conditions and other factors; theoretically, GMAW surfacing welding is the most suitable remanufacturing method for hob cutter ring repair. Because TBM hob cutters have extremely high and strict requirements for remanufacturing performance and the remanufacturing technology itself is quite difficult, current research on remanufacturing and repairing of hob cutter rings is still limited. Because TBM hob cutters have extremely high and strict requirements for remanufacturing performance, the remanufacturing technology itself is quite difficult. According to the simulation results, it is recommended to consider some technological problems in the actual surfacing repair process
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