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Base manufacture technology of four-high mill

A four-high rolling mill and manufacturing process technology, applied in the direction of manufacturing tools, metal rolling mill stands, metal rolling, etc., can solve problems such as the influence of rolling mill devices, lack of good technological means, and breakage of stands, so as to avoid friction and wear, Avoid local brittle fracture and improve strength

Active Publication Date: 2016-03-23
NANTONG HONGFENG ELECTRO MECHANIC
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the working process of the rolling mill, the stand will be subjected to vertical impact force, and after a certain period of time, the stand will be partially fractured, such as the original rolling mill stand of Wuhan Iron and Steel Hanyang Steel Plant described in Document 1, and then the entire rolling mill device will be affected
How to improve the hardness and toughness of the machine base so that the machine base does not directly break, there is no good technical means at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] A base manufacturing process for four-high rolling mill equipment, comprising the following process steps:

[0025] Selecting Cr steel to prepare the base; annealing the selected Cr steel, the temperature range of the annealing treatment is: 750-800°C, heat preservation for 2-4h, cooling rate is 60-70°C / h, and dragging back to make The existing stress of Cr steel in the production and processing process is eliminated, and the coarse grains recombine into small grains, which not only eliminates the stress existing in Cr steel but also improves the overall toughness of Cr steel, which is convenient for subsequent milling machine processing and is also conducive to Improve the toughness of the processed base; mill the Cr steel to complete the holes and grooves required for the installation of the four-roll mill; there are purely physical methods to obtain the holes and grooves during the milling process, so that the processing position of the Cr steel will have more Stress...

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Abstract

The invention belongs to the field of base manufacture, in particular to a base manufacture technology of a four-high mill. The base manufacture technology comprises the following technical steps: using Cr steel as a material; carrying out annealing treatment on the Cr steel used; machining the Cr steel; carrying out stress relieving annealing thermal treatment on the Cr steel subjected to machining; adopting friction stir welding to carry out welding molding on the Cr steel so as to obtain a base; carrying out homogenizing annealing treatment on the base obtained through welding, and after the base is cooled with the furnace, carrying out full annealing treatment again; carrying out surface strengthening treatment, that is sequentially carrying out shot blasting treatment and surface carburizing treatment on the base obtained; and coating the surface, subjected to surface strengthening treatment, of the base with anti-rust oil and a finish paint. The whole base produced has tenacity, but the surface has high hardness, so that in the application process of the base, even if the surface of the base cracks, the base is still full, and the influence of the brittle failure of the base on the mill is avoided.

Description

technical field [0001] The invention belongs to the field of base manufacturing, in particular to a base manufacturing process of a four-high rolling mill. Background technique [0002] A rolling mill is the equipment that realizes the metal rolling process. Generally refers to the equipment that completes the whole process of rolling production, including main equipment, auxiliary equipment, lifting and transportation equipment and auxiliary equipment. During the installation process of the rolling mill, the base is mainly installed on the frame, and the frame is fixed on the foundation. Bear the gravity and overturning moment of the working machine base, and at the same time ensure the accuracy of the installation size of the working machine base. During the working process of the rolling mill, the stand will be subjected to vertical impact force, and after a certain period of time, the stand will be partially fractured, such as the original rolling mill stand of Wuhan I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21B31/02
CPCB21B31/02B23P15/00
Inventor 王艳峰
Owner NANTONG HONGFENG ELECTRO MECHANIC
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