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Spacer ring for hob and assembly process of spacer ring on disc hob

A disc-shaped hob and assembly process technology, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of small yield strength of spacer ring materials, poor assembly process quality, hob failure, etc.

Active Publication Date: 2019-07-19
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a spacer for a hob and an assembly process of the spacer on a disc-shaped hob, which solves the problem of the low yield strength and low plastic deformation capacity of the existing spacer material, and the poor quality of the existing assembly process, which leads to The Problem With Premature Knife Failure

Method used

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  • Spacer ring for hob and assembly process of spacer ring on disc hob
  • Spacer ring for hob and assembly process of spacer ring on disc hob
  • Spacer ring for hob and assembly process of spacer ring on disc hob

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, the spacer material for the hob is made of the following raw materials in weight percentage: C 0.18%, Si0.17%, Mo 0.3%, Cr 0.4%, Fe balance; impurity P ≤ 0.03%, S ≤ 0.03%.

[0035] The preparation steps of the spacer ring for the hob are as follows:

[0036] (1) Electric arc furnace smelting: Add the raw materials into the electric arc furnace to melt, blow oxygen to help the melting during the melting period, the oxidation temperature is 1580°C, and obtain the molten material after melting;

[0037] (2) Refining in LF furnace: Refining the molten material obtained in step (1), controlling the argon blowing pressure of the ladle at 0.2MPa, and controlling the total slag amount at 22kg per ton of steel during refining;

[0038] (3) VD degassing treatment: vacuum degree ≤ 67 Pa, keep for 15 minutes; after breaking the vacuum, soft argon blowing treatment for 18 minutes to obtain molten steel;

[0039] (4) Forging: The molten steel obtained in step (3) i...

Embodiment 2

[0053] In this example, the spacer material for the hob is made of the following raw materials in weight percentage: C 0.20%, Si0.25%, Mo 0.5%, Cr 0.8%, Fe balance; impurity P ≤ 0.03%, S ≤ 0.03%.

[0054] The preparation steps of the spacer ring for the hob are as follows:

[0055] (1) Electric arc furnace smelting: Add the raw materials into the electric arc furnace to melt, blow oxygen to help the melting during the melting period, the oxidation temperature is 1600°C, and obtain the molten material after melting;

[0056] (2) Refining in LF furnace: Refining the molten material obtained in step (1), controlling the argon blowing pressure of the ladle at 0.3MPa, and controlling the total slag amount at 24kg per ton of steel during refining;

[0057] (3) VD degassing treatment: vacuum degree ≤ 67 Pa, keep for 18 minutes; after breaking the vacuum, soft argon blowing treatment for 20 minutes to obtain molten steel;

[0058] (4) Forging: The molten steel obtained in step (3) i...

Embodiment 3

[0061] In this example, the spacer material for the hob is made of the following raw materials by weight percentage: C 0.24%, Si0.37%, Mo 0.8%, Cr 1.0%, Fe balance; impurity P ≤ 0.03%, S ≤ 0.03%.

[0062] The preparation steps of the spacer ring for the hob are as follows:

[0063] (1) Electric arc furnace smelting: Add the raw materials into the electric arc furnace to melt, blow oxygen to help the melting during the melting period, the oxidation temperature is 1650°C, and obtain the molten material after melting;

[0064] (2) Refining in LF furnace: Refining the molten material obtained in step (1), controlling the argon blowing pressure of the ladle at 0.4MPa, and controlling the total slag amount at 25 kg per ton of steel during refining;

[0065] (3) VD degassing treatment: vacuum degree ≤ 67 Pa, keep for 20 minutes; after breaking the vacuum, soft argon blowing treatment for 25 minutes to obtain molten steel;

[0066] (4) Forging: The molten steel obtained in step (3) ...

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Abstract

The invention discloses a distance ring for a hob and an assembly technology of the distance ring on the disc-shaped hob. The distance ring is prepared from 0.18-0.24% of C, 0.17-0.37% of Si, 0.3-0.8%of Mo, 0.4-1.0% of Cr, the balance Fe and impurities comprising P smaller than or equal to 0.03% and S smaller than or equal to 0.03%. The invention further provides the hob assembly technology. Whenhobs with different start torques are needed under different geological conditions, the hob does not need to be disassembled, the deformation degree of the distance ring of the hob can be changed byadjusting the amplitude of locking force of the hob, and the starting torque of the hob can be rapidly adjusted to adapt to different geological conditions.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a spacer for a hob and an assembly process for the spacer on a disc-shaped hob. Background technique [0002] In the field of underground engineering, the application of shield method construction is more and more extensive. The hob is the main rock-breaking tool on the shield cutter head. The friction, shearing force and impact force of the hob are quite large during work. The main damage methods of the hob are eccentric grinding and rotational grinding. Due to the unreasonable hob assembly process and poor hob assembly quality. Especially when excavating complex strata, the phenomenon of premature failure of the hob due to poor assembly quality of the hob is more prominent. The adjustment and preloading of the rolling bearing clearance in the hob is an important part of the hob assembly work. The adjustment of the rolling bearing clearance can improve the rotation accuracy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/22C22C33/06C21C7/10C21D9/22E21D9/08
CPCC21C7/10C21D9/22C22C33/06C22C38/02C22C38/22E21D9/08
Inventor 于庆增张家年喻中孝尚勇郑康泰
Owner CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD