Full-hardening withdrawal and straightening roller of withdrawal and straightening machine and heat treatment process
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A technology of tension leveling machine and tension leveling roller, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of surface damage, workpiece use effect, etc., to increase thermal shock resistance and wear resistance, The effect of improving efficiency and reducing deformation
Pending Publication Date: 2020-05-12
WUXI YIBAO MACHINERY EQUIP CO LTD
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Problems solved by technology
[0006] Aiming at the deficiencies of the prior art, the present invention provides a fully hardened tension leveling machine tension leveler and heat treatment process, which solves the problem that the existing tension leveler surface is susceptible to loss during use, reduces the use effect of the workpiece and affects the processing quality of the equipment
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Embodiment 1
[0033] by An example of the heat treatment process of tensioning and straightening rollers:
[0034] A fully hardened tension leveler tension leveler roll and heat treatment process is characterized in that it comprises the following heat treatment steps:
[0035] S1. The finished forged parts are pre-processed by rough turning. The machining reserve is 8mm. The rough machining is only the hoisting at both ends and the center hole, and then the heat treatment process;
[0036] S2. The workpiece is heat-treated by the segmental preheating method, and preheated in the heating equipment, successively carry out 400°C preheating → 600°C preheating → 800°C preheating, 400°C preheating time is 2.5 hours, 600°C preheating The time is 1.5 hours, and the preheating time at 800°C is 0.75 hours;
[0037] S3, after workpiece preheating finishes, the heating temperature in the heating equipment is raised to 1020 ℃ of temperature and carries out quenching treatment, and quenching treatmen...
Embodiment 2
[0045] by An example of the heat treatment process of tensioning and straightening rollers:
[0046] A fully hardened tension leveler tension leveler roll and heat treatment process is characterized in that it comprises the following heat treatment steps:
[0047] S1. The finished forged parts are pre-processed by rough turning. The machining reserve is 10mm. The rough machining is only the lifting of the two ends and the center hole, and then the heat treatment process;
[0048] S2. The workpiece is heat-treated by segmental preheating method, and preheated in the heating equipment, and the preheating is carried out successively at 400°C→600°C→800°C. The preheating time is 3.5 hours at 400°C and 600°C. The time is 2 hours, and the preheating time at 800°C is 1.5 hours;
[0049] S3, after workpiece preheating finishes, the heating temperature in the heating equipment is raised to 1020 ℃ of temperature and carries out quenching treatment, and the quenching treatment time is 45...
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Abstract
The invention relates to the technical field of withdrawal and straightening roller heat treatment, and discloses a full-hardening withdrawal and straightening roller of a withdrawal and straighteningmachine and a heat treatment process. The full-hardening withdrawal and straightening roller comprises a roller body, the two ends of the roller body are both connecting ends, and the end surfaces ofthe two connecting ends are both provided with positioning counter bores. According to the full-hardening withdrawal and straightening roller of the withdrawal and straightening machine and the heattreatment process, the purpose of preheating is to reduce the temperature difference of a workpiece in all stages, the purpose of heat preservation in each temperature stage is to enable the temperature inside and outside the workpiece to reach the set temperature and then move upwards, bending and deformation of the workpiece during rapid heating and quenching are effectively reduced, the quenching heat treatment time of the inner and outer metal structures of the workpiece at the quenching temperature is shortened, the heat treatment efficiency is effectively improved, and residual austenitic iron is converted into bast-field loose iron, so that on one hand, the hardness of the workpiece can be improved, and on the other hand, deformation of the workpiece caused by temperature rise during use can be reduced; and local tempering connecting ends are adopted, breakage during use is avoided, and the stability of the workpiece during use is guaranteed.
Description
technical field [0001] The invention relates to the technical field of heat treatment of tensioning and leveling rollers, in particular to a fully hardened tensioning and leveling machine tensioning and leveling roller and a heat treatment process. Background technique [0002] Common stretch levelers for cold-rolled strip steel include two bends and two straightenings, two bends and one straightening, and one bend and one straightening, among which the two bends and one straightening type are most widely used. Two-bending-one-straightening tension leveling machine (tension leveling machine) is mainly composed of two sets of bending rolls, one set of straightening rolls, several turning rolls, one set of roll changing device, and a roll lifting system. [0003] The pulling and leveling roll is an important part of the pulling and leveling machine. When the pulling and leveling roll is in use, the temperature of the pulling and leveling roll itself changes with a large temper...
Claims
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Application Information
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