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Method to Solve Hot Cracks in Outer Layer of High Speed ​​Steel Roll for Rod and Wire Rod

A high-speed steel, rod and wire technology, applied in the field of centrifugal casting of rolls, can solve problems such as thermal cracks, and achieve the effect of improving service life

Active Publication Date: 2016-05-11
邢台轧辊线棒辊有限责任公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a rolling casting method, which can solve the problem of hot cracks that may occur when the outer layer of the high-speed steel roll is poured.

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  • Method to Solve Hot Cracks in Outer Layer of High Speed ​​Steel Roll for Rod and Wire Rod

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Embodiment 1

[0028] There is a high-speed steel centrifugal roll for rolling rods and wires. The size specification is Φ430×650×1535mm, the thickness of the working layer is 55mm, and the total amount of molten steel in the outer layer is about 320Kg. The outer layer pouring steps of the high-speed steel roll are as follows:

[0029] (1) Before pouring, the centrifuge idles for 10 minutes with the casting mold, and starts pouring after the centrifugal pouring system runs smoothly, and the speed is controlled at 740r / min (centrifugal gravity multiple is about G=100);

[0030] (2) The temperature measured before the pouring of the outer layer of molten steel is 1500°C;

[0031] (3) At the beginning of pouring, quickly pour 130Kg of molten steel within 16s, then reduce the speed of the centrifuge to 700r / min, at this time reduce the pouring flow rate, and pour the remaining 190Kg of molten steel into the rotary casting in 40s in type.

[0032] (4) After all the outer layer of molten steel is...

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Abstract

The invention discloses a method for avoiding a hot crack on the outer layer of a high speed steel roll for rods and wires. The method includes the following steps: a centrifugal pattern is adopted to forge the outer layer of the high speed steel roll; during centrifugal casting of the outer layer, the rotating speed of a centrifuge is changed by phase, and the molten steel casting speed and the rotating speed of the centrifuge are changed accordingly; at the starting phase of the centrifugal casting, a high rotating speed and high-speed casting are adopted; at the medium phase of the centrifugal casting, a medium rotating speed and low-speed casting are adopted; after casting is finished, a low rotating speed is adopted. Through the variable-speed centrifugal casting of molten steel for the outer layer of the high speed steel roll, the molten steel mold filling is facilitated at the starting phase of casting; molten steel is guaranteed to quickly and evenly cover the entire inner chamber of a casting mold; cold-lap, cold shut and other defects are avoided; the stress on the centrifugal outer layer is also improved; element segregation on the outer layer is reduced; stress cracking tendency is reduced; finally, the purpose of preventing the outer layer from the hot crack is achieved.

Description

technical field [0001] The invention relates to a method for solving thermal cracks in the outer layer of a centrifugal roll, in particular to a method for solving the thermal crack in the outer layer of a high-speed steel roll for rods and wires, and belongs to the field of centrifugal casting of rolls. Background technique [0002] With the development of high-speed and modernized bar and wire rolling mills, the mismatch between the wear resistance of the rolls of the finishing stand and the production efficiency of the rolling mill has become prominent. The rolling mill hopes to improve the wear resistance and accident resistance of the rolls to minimize the Reduce roll consumption and prolong the online cycle of rolls. Due to its excellent comprehensive performance, the high-speed steel material has become an ideal material for the finishing stand rolls of bar and wire rod mills. Due to the constraints of rolling conditions and the secondary processing capacity of rollin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/02
CPCB22D13/02
Inventor 杨昱东陈风林韩建宁朱志磊
Owner 邢台轧辊线棒辊有限责任公司
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