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Method for aligning cold roller
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A cold roll and straightening technology is applied in the field of straightening after heat treatment and deformation of high-alloy rolls, and achieves the effects of obvious effect, convenient operation and simple equipment structure.
Inactive Publication Date: 2010-01-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0003] In order to solve the straightening problem of heat treatment deformation of high-alloy rolls with a diameter below 100mm, the invention provides a method for straightening cold rolls
Method used
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Embodiment 1
[0014] Embodiment 1: The straightening device of the present invention includes a base 1, which is a rectangular metal piece, and three parallel grooves 7 are arranged on the base 1. The upper mouth of the groove 7 is small, the lower bottom is large, and the cross section of the groove 7 is "⊥" The roll stand 5 is set in the groove 7 in the middle. The roll stand 5 is a metal plate with raised ends and an arc in the middle. The grooves on both sides of the roll stand 5 are provided with support frames 2, and the support frames 2 are provided with support plates 3. A hole with an internal thread is provided on the support plate 3, a bolt 4 is provided on the hole, and the cross section of the bottom end 6 of the support frame is in the shape of "⊥".
[0015] After quenching, the temperature of the 1# roll is 230℃, and the deformation is 1.1mm (that is, the roll is arched, and the middle is arched 1.1mm). Set the arch surface of the 1# roll upward and fix it on the roll stand of th...
Embodiment 2
[0016] Example 2: After quenching, the temperature of 2# roll is 300°C and the deformation is 1.6 mm. Set the arched surface of the 2# roll upward and fix it on the roll base of the above-mentioned straightening device, and then rotate the bolt to apply pressure to the 2# roll , Until the 2# roll is reversely bent by 3.5 mm, then stop applying pressure to the 2# roll. When the temperature of the 2# roll is 45 degrees Celsius, loosen the bolts and remove the 2# roll. At this time, the 2# roll still has 0.3 mm Then, the 2# roll was hoisted vertically into an oil furnace with a temperature of 160℃, kept for 1000 minutes, and then air-cooled to room temperature. After the tempered 2# roll is taken out, the deformation is eliminated.
Embodiment 3
[0017] Example 3: After quenching, the temperature of the 3# roll is 500°C and the deformation is 2.1 mm. The arch surface of the 3# roll is set up and fixed on the roll seat of the above-mentioned straightening device, and then the bolt is rotated to apply pressure to the 3# roll , Until the 3# roll reversely bends 4.5 mm, then stop applying pressure to the 3# roll, and when the temperature of the 3# roll reaches 50 degrees Celsius, loosen the bolts and remove the 3# roll. At this time, the 3# roll still has 0.8 mm Then, the 3# roll is vertically hoisted into an oil furnace with a temperature of 160℃, kept for 1440 minutes, and then air-cooled to room temperature. After the tempered 3# roll is taken out, the deformation is eliminated.
[0018] Note: Rolls whose deformation after quenching and tempering do not exceed 1 mm are not straightened.
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Abstract
The invention discloses a device for straightening chilled rollers and a method thereof, which are mainly used for the straightening of high alloy rollers with the diameter below 100mm and deformed after thermal treatment. The straightening device comprises a base which is a rectangle metal piece; a support frame and a roller base are arranged on the base; the support frame is provided with a pressing plate on which bolts are arranged. The straightening method of the invention is that the arch face of a 80 DEG C to 600 DEG C roller is faced up and the concave face is faced down and then the roller is fixed on the roller base of the straightening device; spiral bolts apply force on the roller to press the arch till the arch recesses 2 to 3 times the original upwards arch; when the roller temperature drops to 30 DEG C to 50 DEG C, the bolts are loosened and the roller is released and put into an oil furnace of 150 DEG C to 160 DEG C; the roller is kept in the oil furnace for 200mins to 1,440mins and then cooled by air to the ambient temperature after out of the furnace. The device of the invention has simple structure, convenient operation and comparatively low cost and the straightening method is easy to acquire.
Description
Technical field: [0001] The invention is mainly used for the straightening of high alloy rolls with a diameter of less than 100 mm after heat treatment and deformation. Background technique: [0002] The high-alloy forged steel cold roll deforms greatly during the heat treatment process. If straightening is not carried out in time, the deformation of the roll will often exceed the machining allowance and be scrapped. Straightening of rolls deformed by heat treatment generally adopts press straightening. The press is generally hydraulic. The roll is placed on the press platform during straightening. The two ends of the roll are supported by V-shaped pads. The arched surface of the roll is upward and the concave surface is downward. The pressure head of the press is opposite to the middle part of the roll. Apply downward pressure to achieve the purpose of straightening. High-alloy forged steel cold rolls have higher strength after heat treatment. When a press is used to straighte...
Claims
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Application Information
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