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Analysis of Bearings in High Speed ​​Wire Mills
Source: China Bearing Network Time: 2013-09-14
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1 . Functional requirements 1.1 The most obvious feature of the high-reliability high-speed wire production line is the high reliability of the rolling mill's continuous operation. Because the high-speed wire production line has a high unit output value; the demand is in the regular inspection cycle; the bearing ratio as the critical component of the rolling mill Usually the rolling mill bearings have higher reliability. If the bearing is faulty, the whole production line will be discontinued; this is not tolerated by the manufacturer. Therefore, when drawing and manufacturing high-speed rolling mill bearings, it should be ensured that it can be operated in high-speed operation. The reliability of the.
1.2 Wear-resistant high-speed rolling mill bearing wear resistance is strong; can be used to high-speed rotating work. For example: a high-speed wire production line; export line speed 63m / s; export rolling mill roll diameter of 330mm; The operating speed is 3650r/min; working at high speed and heavy load for a long time; the wear resistance of the bearing will be a serious test. This requires the bearing to be worn with the need for wear resistance.
1.3 Long fatigue life High-speed rolling mill bearing fatigue life is long. Under normal conditions; foreign high-speed rolling mill bearings are used for three years (because half of the roll assembly is unloading machine protection, renovation; practice time For one and a half years); therefore, users need domestic bearings for at least two years.
1.4 Impact toughness is better. The impact toughness of high-speed rolling mill bearings is better; especially for the bearings used in roughing mills; the process of rolling continuous casting billets into bars; the impact load is large. Therefore, the high-speed rolling mill bearings are high. Under the condition of high speed and high shock, the operation should not break the appearance.
In summary, the operating characteristics of the high-speed rolling mill bearings are that they can be operated in a stable and reliable manner under high-speed and high-impact conditions; and have a long fatigue life.
2 . The bearing drawing method is based on the operation status, service life, failure condition and user's demand of each line bearing; the main parameters are adjusted properly; the depiction arrives at a satisfactory effect.
Secondly; reasonably determine the skill conditions; based on the measured results of similar products; and consider the specific operation of the bearing; propose reasonable skill needs.
3. The production of high-speed rolling mill bearings in view of the particularity of the high-speed rolling mill operation; in the production process, the first two operations are done. The first is the selection of data and heat treatment processes; the second is the roughness control of the rolling appearance. The inner ring wall is thicker; the outer ring wall is more than the miscellaneous equipment, the mischief, the smashing, the smashing, the smashing, the smashing, the smashing, the singularity, the singularity, the sputum, the sputum, the sputum, the sputum The outer ring adopts the isothermal quenching and tempering process as much as possible; the obtained metallographic phase is arranged as the lower bainite; after this treatment, the bearing, strength, wear resistance, impact toughness and fatigue life number are all coordinated; The above-mentioned work requirements. Others; the heat treatment hardness is also different according to the different conditions of the coarse, medium and finishing mills; that is, for the roughing mill; the speed is relatively low; and the impact load is relatively large; therefore, the hardness of the bearing parts is low. For the finishing mill; the speed is relatively high; and the impact load is relatively high. The handcuffs are smashing and catching the scorpion.
After investigation and analysis, the outer surface roughness of the inner and outer rings of the high-speed rolling mill bearing, the outer surface of the rib, and the flank surface of the roller are smaller than those of the general rolling mill bearings. For this reason, the process is adopted. The level of roughness above or near the level of foreign products.
4. The trial condition of the bearings began in May 1997; nine types of high-speed rolling mill bearings have been trial-produced or batch-produced for three high-speed wire production lines in China; most of them are used in an excellent condition; the whole line is stopped without any work problems. In the meantime; in May 1997, the first batch of prototyped equipment on a high-speed line in the southwest was on the lead mill (the plumb mill was worse than the horizontal mill). The mill bearing (four-row tapered roller bearing); One set of bearings was in operation for a period of time; the normal unloading machine found that the outer ring had a cracked appearance; the other three sets did not find any wear and tear, fatigue, breakage and other failure conditions in June 2000.
5 . It is advocated to further develop and apply high-speed rolling mill bearings; to make its function stable at a high level; it should be carried out from the following aspects.
(1). According to the literature analysis; on the basis of experiments, research and development of the new excellent rolling mill bearing steel; including carburized bearing steel and high carbon chromium bearing steel.
(2). On the basis of analysis, discussion, comparison of similar products; determine the main parameters according to the bearing operation; do product description. In addition; change the layout of the parts; such as the placement of the slots, the shape of the spacers, etc. are not ignored.
(3). Develop process research; compensate for the relatively poor function of data and the relative backwardness of equipment. Focus on heat treatment and grinding; ensure the depth and hardness uniformity of useful carburized layers; impact toughness and parts of high carbon chromium steel parts Shape and public service and appearance roughness within a certain accuracy range.
(4). Formulate specific equipment, commissioning, protection and inspection instructions, send skilled personnel to the user; explain the precautions for bearing application for on-site technicians and workers; answer the questions raised by the on-site personnel; do a good job in after-sales service. Work well with bearing manufacturers.
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