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Heat treatment process for high-performance disc cutter of TBM

A disc-shaped hob, high-performance technology, applied in the field of heat treatment, can solve the problems of unreasonable carbide morphology, size and distribution, reducing the service life of disc-shaped hob, coarse grain size, etc., to shorten the construction period, Improve the service life and the effect of uniform and fine grain size

Active Publication Date: 2017-11-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a high-performance TBM disc-shaped hob heat treatment process to solve the unreasonable morphology, size and distribution of carbides in the prior art, coarse grain size, Unevenness and other problems that seriously reduce the service life of the disc hob

Method used

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  • Heat treatment process for high-performance disc cutter of TBM
  • Heat treatment process for high-performance disc cutter of TBM
  • Heat treatment process for high-performance disc cutter of TBM

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, the composition and mass percentage of the disc hob for TBM are: carbon 0.50%; silicon 1.00%; manganese 0.40%; chromium 5.20%; nickel 0.25%; molybdenum 1.35%; vanadium 1.27%; Sulfur 0.006%; the balance is iron.

[0036] In this embodiment, the heat treatment process includes the following steps: 1) Heating the disc-shaped hob to 860°C at 150°C / h, keeping it warm for 2.5 hours, slowly cooling to 590°C at 20°C / h, and cooling to room temperature with the furnace ; 2) First, heat the disc-shaped hob to 1050 °C at 150 °C / h, keep it warm for 2.5 hours, and quickly cool it to 310 °C at 120 °C / h; secondly, heat the disc-shaped hob at 150 °C / h to 1050°C, keep warm for 2.5 hours, quickly cool at 120°C / h to 310°C; then, heat the disc hob at 150°C / h to 860°C, keep warm for 2.5 hours, cool down at 80°C to 735°C, hold for 4.5 h, cool to room temperature with the furnace; 3) Quenching process: heat the disc-shaped hob to 1050 °C at 150 °C / h, keep warm for 2.5 hour...

Embodiment 2

[0039] In this embodiment, the composition and mass percentage of the disc hob for TBM are: carbon 0.48%; silicon 1.15%; manganese 0.26%; chromium 5.70%; nickel 0.18%; molybdenum 1.43%; vanadium 0.88%; Sulfur 0.005%; the balance is iron.

[0040]In this embodiment, the heat treatment process includes the following steps: 1) heating the disc-shaped hob to 850°C at 120°C / h, keeping it warm for 2 hours, slowly cooling at 10°C / h to a temperature of 580°C, and cooling to room temperature with the furnace; 2) First, heat the disc-shaped hob to 1040 °C at 120 °C / h, keep it warm for 2 hours, and quickly cool it to 300 °C at 100 °C / h; secondly, heat the disc-shaped hob to 1040 °C at 120 °C / h , keep warm for 2 hours, and quickly cool at 100°C / h to 300°C; then, heat the disc hob at 120°C / h to 850°C, hold for 2 hours, cool down at 60°C to 730°C, hold for 4 hours, and cool with the furnace to room temperature; 3) Quenching process: heat the disc-shaped hob to 1040 °C at 120 °C / h, keep war...

Embodiment 3

[0043] In this embodiment, the composition and mass percentage of the disc hob for TBM are: carbon 0.55%; silicon 0.82%; manganese 0.57%; chromium 4.51%; nickel 0.38%; molybdenum 1.19%; vanadium 1.36%; Sulfur 0.007%; the balance is iron.

[0044] In this embodiment, the heat treatment process includes the following steps: 1) heating the disc-shaped hob to 870°C at 180°C / h, keeping it warm for 3 hours, slowly cooling to 600°C at 30°C / h, and cooling to room temperature with the furnace; 2) First, heat the disc-shaped hob to 1060 °C at 180 °C / h, keep it warm for 3 hours, and quickly cool it to 320 °C at 130 °C / h; secondly, heat the disc-shaped hob to 1060 °C at 180 °C / h , keep it warm for 3 hours, and quickly cool it at 130°C / h to 320°C; then, heat the disc hob at 180°C / h to 870°C, keep it at 3h, cool it at 100°C to 740°C, keep it at 5h, and cool it with the furnace to room temperature; 3) Quenching process: heat the disc-shaped hob to 1060 °C at 180 °C / h, keep warm for 3 hours,...

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Abstract

The invention belongs to the field of heat treatment, and particularly relates to a heat treatment process for a high-performance disc cutter of a TBM. The heat treatment process comprises the following steps: 1, carrying out annealing treatment after steel forging; 2, carrying out double-refining heat treatment process before tempering, specifically, heating a forge piece to 1030 deg C-1060 deg C, keeping the temperature for 2 hours-3 hours, repeating the process, heating to 850 deg C-870 deg C and keeping the temperature for 2 hours-3 hours, cooling to 730 deg C-740 deg C and keeping the temperature for 4 hours-5 hours, and carrying out furnace cooling; and 3, carrying out quenching treatment, specifically, heating the workpiece to 1030 deg C-1060 deg C, keeping the temperature for 2 hours-3 hours, and carrying out oil quenching, then carrying out tempering treatment, specifically, heating the workpiece to 540 deg C-560 deg C, keeping the temperature for 1.5 hours-2.5 hours, carrying out air cooling to the room temperature, and repeating the tempering treatment for one time. According to the disc cutter of the TBM obtained through the process, carbide is fine and is distributed on a substrate in a dispersed mode, a grain size is uniform and fine, and the carbide and the grain size are subjected to the double-refining; and the disc cutter has high hardness, and good wear resistance and impact resistance, and the service life of the disc cutter is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of heat treatment, in particular to a high-performance TBM disc hob heat treatment process, which is suitable for the manufacturing process of high-performance TBM disc hobs. Background technique [0002] TBM (Tunnel boring machine) is a full-face tunnel boring machine, which is generally used for tunneling in hard rock formations. The disc-shaped hob is the key component of TBM, fixed on the TBM cutter head, directly in contact with the rock formation during the working process, and performs rock-breaking action through the extrusion of the rock formation, and drives the cutter head on the cutter head through the rotation of the cutter head. The knives scrape against the rock to dislodge the broken rock. The TBM bears a load of up to 260-330KN during the working process, and the TBM often fails in the form of wear and fracture. At the same time, there are other failure forms such as crushing and chipping caused by h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/22C21D1/18C22C38/18C22C38/08C22C38/02C22C38/04C22C38/12
CPCC21D1/18C21D9/22C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
Inventor 孙明月赵正阳徐斌高金柱夏立军李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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