Production method for reducing heat treatment deformation of roller
A heat treatment deformation and production method technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of stress relief tempering, inability to cold proof, serious heat treatment deformation, etc., to improve deformation and reduce quenching stress deformation Effect
Pending Publication Date: 2022-03-11
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology
[0002] In the heat treatment production process of the roll, due to the large difference in the roll diameter and the size of the roll body, after the trolley furnace heat treatment production, the heat treatment deformation is serious, and the runout is generally between 15 and 25mm, and it needs to be straightened, and due to the material It has high resistance and cannot be cold-calibrated. It must be thermally calibrated at about 600°C. It is difficult to straighten and has safety risks. After straightening, it needs to be stress-relieved and tempered, and the production cost is high. Therefore, it is necessary to improve the design of the process and operation. To greatly reduce the amount of deformation jump after heat treatment of the roll, so as to meet the subsequent finishing requirements
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Embodiment 1
[0024] Embodiment 1: A kind of production method that reduces heat treatment deformation of MC3 roll, take roll body diameter φ 530mm, length 2.1m, roll diameter φ 210mm at both ends of the roll, length each 1.3m, and workpiece total length 4.7m as example, specifically Proceed as follows:
[0025] Step 1) Set up 4 material piers on the trolley of the quenching heating furnace as support points, and arrange them according to the length of the roll. The distance from both ends of the roll diameter is 0.65m; that is, on the trolley, in addition to the original supporting parts of the roll body (the roll body is a large step in the middle), the roll diameter at both ends (the roll diameter is a small step at both ends) The support of the position reduces the sagging phenomenon of the roller diameter at both ends due to its own weight during the heating process;
[0026] Step 2), hang the roll on the material pier and place it well, after fixing the position, mark the upper and l...
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The invention relates to a production method for reducing heat treatment deformation of a roller. The method comprises the following steps: marking upper and lower parts on a roller diameter end face of the roller before quenching heating; during quenching heating, supports are arranged on two sides of a roller body of a middle large-step roller on a trolley, and supports are also arranged at small-step roller diameters at two ends of the roller; after heat preservation is finished at the quenching heating temperature of 900 + / -10 DEG C, the roller is cooled to 860 + / -10 DEG C along with the furnace, heat preservation is conducted for 0.5 h, and the roller is taken out of the furnace and put into a special quenching cooling tool; in the whole quenching process, the roller is placed in a special quenching tool to be quenched; after quenching cooling is finished, the roller is lifted out of the special quenching cooling tool and put into a tempering furnace; turning over the upper part and the lower part of the roller according to the steel seal marks in the process of putting the roller into the tempering furnace; after tempering and discharging, the roller is air-cooled to the room temperature for jerk value detection, the deformation jerk value of the roller after heat treatment can be greatly reduced, and the subsequent finish machining requirement can be met without straightening.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of large forgings, and in particular relates to a production method for reducing heat treatment deformation of rolls which can greatly reduce the amount of deformation runout after heat treatment of rolls and meet the requirements of subsequent finishing without straightening. Background technique [0002] In the heat treatment production process of the roll, due to the large difference in the roll diameter and the size of the roll body, after the trolley furnace heat treatment production, the heat treatment deformation is serious, and the runout is generally between 15 and 25mm, and it needs to be straightened, and due to the material It has high resistance and cannot be cold-calibrated. It must be thermally calibrated at about 600°C. It is difficult to straighten and has safety risks. After straightening, it needs to be stress-relieved and tempered, and the production cost is high. Therefo...
Claims
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IPC IPC(8): C21D9/38C21D1/18C21D1/63
CPCC21D9/38C21D1/18C21D1/63C21D9/0025C21D9/0018
Inventor 赵颖王怡群田建宁薛正国孙家乐
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD