Laser manufacturing method for hearth roll of hot-rolled annealing furnace

A manufacturing method and hearth roll technology, applied in the direction of manufacturing tools, heat treatment furnaces, furnaces, etc., can solve problems such as uneven roll surface, product quality problems, and affecting the surface state of strip steel, so as to achieve dense interface structure and stable and reliable quality , good wear resistance effect

Active Publication Date: 2021-11-16
上海大陆天瑞激光表面工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a laser manufacturing method for the hearth roll of a hot-rolled annealing furnace, which has the advantages of high service life, and solves the problem that once the surface of the furnace roll peels off, the roll surface will become uneven Uneven, while the hot-rolled stainless steel sheet is extremely soft at a high temperature of 1200-1300 degrees Celsius. Once the surface of the roller table is raised or pitted, it will be printed on the surface of the strip, thereby affecting the surface state of the strip. During the manufacturing process, such surface defects will be magnified, resulting in serious product quality problems. On the other hand, due to the frequent replacement of furnace rolls, frequent shutdowns are required for maintenance, which also brings greater impact on improving the production efficiency of continuous rolling and continuous annealing. big problem

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: TISCO hot annealing line hearth roll

[0030] The total length of the stainless steel hearth roll of Taiyuan Iron and Steel Co., Ltd. is 5 meters, the roll diameter is 330mm, and the length of the effective use part in the middle is 3 meters. When spraying the roller table, the average service life is 3-6 months, and the phenomenon of block falling basically begins to occur in 3 months. After the longest use of 6 months, it will be offline due to seriously affecting the quality of the strip steel. When using lasers to manufacture annealing furnace rollers Finally, it has been used online for up to 12 months. After observation, the surface is in good condition, without nodules or peeling, and has no adverse effects on the strip steel.

Embodiment 2

[0031] Example 2: Furnace bottom roll of Dongfang Special Steel hot annealing line

[0032]The length of the bottom roll of Dongfang Special Steel’s thermal annealing line is 2500mm, and the roll diameter is 304mm. The traditional high-alloy material is used as the roll sleeve. It takes 10 days to go off-line for grinding, and then use the laser to manufacture furnace rollers. After 3 months of online use, the surface is in good condition without nodules or peeling, which greatly improves the product quality.

[0033] The beneficial effect of the present invention is: the laser manufacturing method of the hearth roll of the hot-rolled annealing furnace, the surface functional layer of the hearth roll of the hot-rolled annealing furnace and the base material of the furnace roll sleeve are metallurgically bonded, and the bonding strength is not lower than the original 90% of the base material, generally up to 650Mpa or more, through the furnace roller sleeve during the laser pro...

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Abstract

The invention relates to the technical field of hearth rolls of annealing furnaces, and discloses a laser manufacturing method for hearth rolls of hot-rolled annealing furnaces, comprising the following steps: 1) prefabricating hearth rolls; 2) machining the surface; 3) cleaning the surface; 4 ) to obtain cladding powder; 5) laser cladding; 6) to make hearth rolls. In the laser manufacturing method of the hearth roll of the hot-rolled annealing furnace, the surface functional layer of the hearth roll of the hot-rolled annealing furnace and the base material of the furnace roll sleeve are metallurgically bonded, and the bonding strength is not less than 90% of the original base material. It can reach more than 650Mpa. The surface of the roller sleeve is slightly melted during the laser processing process through the furnace roller sleeve. The micro-fused layer is 0.05~0.1mm. No deformation, uniform coating thickness of the prepared functional layer, good dynamic balance after the roller sleeve is assembled, no coarse casting structure in the Co-based functional layer after laser cladding, dense casting layer and its interface structure, fine grains, and Excellent abrasion resistance.

Description

technical field [0001] The invention relates to the technical field of hearth rolls of an annealing furnace, in particular to a laser manufacturing method of a hearth roll of a hot rolling annealing furnace. Background technique [0002] Annealing furnace rollers are used for conveying and supporting the continuous operation of stainless steel plates in the heat treatment furnace. The temperature of the atmosphere in the heating furnace is as high as 1200 ℃, and the heat treatment strips also reach 1100 ℃. In order to ensure the safety of operation and product quality, the furnace rollers It should have good high-temperature stability, and it should not produce large bending deformation under high temperature conditions. At the same time, the hardness of the roller surface should be lower than that of the plate surface under high temperature conditions, so as not to scratch the plate surface, and the material of the roller surface will not be damaged under high temperature co...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C23C24/10C22C19/07C21D9/56C21D1/26
CPCC21D1/26C21D9/563C22C19/07C23C24/103Y02P10/20
Inventor蔡乐钱余昕吴年硕陈江李雷
Owner上海大陆天瑞激光表面工程有限公司