Hot rolling spray cooling method for large cylinder

A technology of spray cooling and large cylinder, which is applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., and can solve problems such as uneven cooling

Active Publication Date: 2013-01-02
YANSHAN UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a spray cooling method for hot rolling of large-scal

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  • Hot rolling spray cooling method for large cylinder
  • Hot rolling spray cooling method for large cylinder
  • Hot rolling spray cooling method for large cylinder

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Embodiment

[0057] Method 1: By adopting the spray cooling method proposed by the present invention, the spray cooling after rolling of the large-scale barrel section is simulated. After adopting this method, the uniformity of temperature distribution on the inner and outer surfaces of the cylinder section is analyzed.

[0058] Specifications of the barrel section used: outer diameter: d 1 =5830mm, inner diameter: d 2 =4796mm, width: 2680mm; the speed of the upper and lower rolls is 0.3rad / s. The basic properties of the material: yield limit: 58MPa; elastic modulus: 90000MPa; Poisson's ratio: 0.3; the rest of the density, specific heat, etc. are functions of temperature. Through the calculation, it can be known that the rotation speed of the barrel joint is 0.1rad / s, and its initial temperature is set at 900°C. Adjust the height of the cooling water pipe so that the arc at the end is concentric with the barrel section and the distance is 50mm. At the same time, the angle between the sp...

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Abstract

The invention relates to a hot rolling spray cooling method for a large cylinder, which is characterized in that an upper spray device and a lower spray device are manufactured; after a large cylinder is rolled, the cylinder is clamped by an upper roller and a lower roller, so that the cylinder is rotated by the driving of frictional force; additionally, the lower spray device extends into the cylinder, and the upper spray device is arranged outside the cylinder; the length of cooling water pipes on the upper spray device and the lower spray device is regulated, so that a connecting line of all of the cooling water pipes on each spray device near the wall end of the cylinder forms a semicircle shape which is concentric with the cylinder; and additionally, the quantity ratio of the cooling water pipes on an upper spray collecting plate and a lower spray collecting plate of the upper spray device and the lower spray device and the flow ratio of cooling water are regulated, so as to cool the inner and outer surfaces of the large cylinder at the same cooling speed after rolling. The hot rolling spray cooling method has the advantages that the problem of uneven cooling of the traditional cylinder heat treatment is solved, the cooling efficiency is increased, the coefficient of heat transfer of the surface of the cylinder is increased on the initial stage of cooling, and the surface quality of the cylinder is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of cooling, and relates to a spray cooling method used for large-scale tubular sections after hot rolling and forming. Background technique [0002] As a new technology, the continuous rolling of large barrel segments has the advantages of high precision, less machining allowance, high material utilization rate, and good internal quality of products. The selection of cooling method after hot rolling and the control of cooling process are the key process steps to ensure the performance of large-scale drum products. When the traditional heat treatment process is used to quench and cool the barrel section, due to the large size of the barrel section, different parts in the axial direction of the barrel section cannot be cooled at the same time, and there is a certain time difference in cooling, which will easily cause uneven temperature distribution, resulting in large Residual stress causes large deformation ...

Claims

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Application Information

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IPC IPC(8): B21B45/02
CPCY02P70/10
Inventor 孙建亮刘宏民彭艳刘建静
Owner YANSHAN UNIV
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