Supporting roller preheat treatment method
A technology for preparing heat treatment and supporting rolls, which is applied to heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as high cost, unsatisfactory, and harmful to the physical and mental health of workers, and achieve the effect of saving costs and material resources
Inactive Publication Date: 2014-02-12
BAOSTEEL ROLL SCI & TECH
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Problems solved by technology
At present, the heat treatment of large forged steel backup rolls includes two stages: preparatory heat treatment and final heat treatment. The main purpose of preparatory heat treatment is to meet the technical requirements of roll neck hardness and ensure that the roll neck has sufficient comprehensive mechanical properties. For example: the technical requirement hardness is 35- 55HSD; mechanical properties Rm≧800MPa; the main purpose of final heat treatment: to improve the fracture resistance and impact resistance of the back-up roll, and to improve the wear resistance and peeling resistance of the surface area of the roll body; the current preparatory heat treatment methods are oil-based Medium conditioning, while oil conditioning has high cost and great environmental pollution, which not only damages the physical and mental health of workers, but also oil conditioning cannot control the hardness of each grade of backup roll, and can only obtain the overall uniform hardness, which cannot satisfy The development requirements of modern rolling mill automation, high precision, high rolling speed and other directions for the comprehensive mechanical properties of backup rolls
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[0027] In order to deepen the understanding of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, which are only used to explain the present invention and do not limit the protection scope of the present invention.
[0028] In the present invention, a high-precision numerical control lathe is used to round the supporting rollers of Cr3, Cr4, and Cr5 materials, and the feed rate is controlled at 0.5-5mm, which can achieve better results and avoid ring cracks and fractures; see the attached figure 1 Shown: Then heat the whole support roller, heat it at 30℃~50℃ per hour to 350℃~400℃, keep it warm for 5~11 hours, then heat it at 30℃~80℃ per hour to 600℃~650℃, Keep warm for 11 to 16 hours, then heat at 30°C to 80°C per hour to 860°C to 970°C and hold for 15 to 24 hours, then take out the furnace, use water as the tempering medium, and use a spray cooling system for segmental cooling; a...
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Abstract
The invention relates to a preheating treatment method for a supporting roller. The method comprises the following steps of: chamfering the supporting roller of Cr3, Cr4 and Cr5 materials, quenching, holding the temperature for a period of time, cooling to 200 DEG C, and then, cooling to the room temperature. In the quenching treatment process, a spraying cooling system is employed to perform sectional spraying cooling, so that not only is the technical demand for the rigid of a roller neck met, but also the enough comprehensive mechanical property of the roller neck is ensured. The preheating treatment method for the supporting roller is applicable for mechanical equipment with a high rigidity demand and high wearing property. The method has the following advantages of low cost, environment friendliness, high efficiency, wide application range, reasonable process, and the like.
Description
technical field [0001] The invention belongs to a material heat treatment method, in particular to a backup heat treatment method for Cr3, Cr4 and Cr5 materials, and is also suitable for mechanical equipment requiring high hardness and strong wear resistance. Background technique [0002] Large forged steel backup rolls are the core functional components of modern steel rolling equipment, mainly bearing the rolling load of work rolls or intermediate rolls, and the preparatory heat treatment of large forged steel backup rolls is a key process in the entire production process of backup rolls. It is necessary to meet the technical requirements of the neck hardness and ensure that the roll neck has sufficient comprehensive mechanical properties to meet the requirements of the working conditions of the backup roll. At present, the heat treatment of large forged steel backup rolls includes two stages: preparatory heat treatment and final heat treatment. The main purpose of prepara...
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IPC IPC(8): C21D9/38C21D1/667C21D1/25
Inventor 陈伟章大健王文明王惕胡现龙孙文忠
Owner BAOSTEEL ROLL SCI & TECH