To the choice of accurate bearing, need considers integratedly the following all sorts of elements: Precision, stiffness, rotate speed and load. According to specific applied requirement, decide which kinds of factor is more main, reentry has the type selecting of specific aim all right. Machine tool main shaft is the heart of whole machine tool, it is precision of implementation workpiece treatment, affect the crucial position of machine tool function directly. Current high speed, efficient producer type is the speed to main shaft, precision, laden ability raised taller requirement with moving noise, because the design maker of this main shaft faces enormous challenge, and analysis of proper bearing type selecting can help main shaft manufacturer answer afore-mentioned challenges. To the choice of accurate bearing, need considers integratedly the following all sorts of elements: Precision, stiffness, rotate speed and load. According to specific applied requirement, decide which kinds of factor is more main, reentry has the type selecting of specific aim all right. Later development will introduce Tiemuken respectively of company different type exceed precise role to contact ball bearing and them the applied environment with applicable place. One, this series cent is the main shaft bearing of series of standard P4 and P4S class, outer lane and scroll body use 52100 complete temper by dipping in water to appear steel commonly inside. Below certain condition, the rotate speed with lubricant fat can be achieved 650, 000 DN, oil-lubricated can achieve 1, 000, 000 DN. Compare with photograph of high speed series, the scroll body diameter of series of standard is bigger, tighten force beforehand taller, apply to cutting load big and the circumstance with high demand of systematic trends tigidity. In addition, the accretion of grease measures the fundamental condition that is consideration of the need in type selecting. Grease is added overmuch, bearing of can serious effect comes loose hot, moving temperature will rise quickly, bring about grease life to drop quickly thereby, also shorten bearing service life; Grease has been added little, the lube film with cannot be formed certain will detached axis is encircled and roll body, the attrition between each other can cause faster temperature rise, affect bearing life likewise. To different rotate speed, the commendatory quantity that add fat also differs accordingly. When rotate speed under 500, when 000 DN, the quantity that add fat should be the 25% - 40% of space of bearing interior freedom; When rotate speed prep above 500, when 000 DN, the quantity that add fat should be the 15% ~ 20% of space of bearing interior freedom. The cage that those who need an attention is series of standard has two sort model: The bakelite cage that rolls the nylon cage of body guiding and outer lane guide. The in-house and free space of two kinds of bearing is different, when computation adds fat to measure, should give divisional. 2, this series is the main shaft bearing of series of ball of pottery and porcelain P4S class, circle of inside and outside appears steel for 52100 complete temper by dipping in water commonly, scroll body is material of pottery and porcelain. Below certain condition, the rotate speed with lubricant fat can be achieved 750, 000 DN, oil-lubricated can achieve 1, 500, 000 DN. Dynamic radial and axial carrying capacity and series of standard comparative, dan Gang sex rises 50% ; The weight of pottery and porcelain is lighter than rolled steel 60% , reduced scroll body to leave the action of mental efforts, decreased to skid thereby with spin phenomenon, also decrease accordingly with the calorific quantity between raceway, bearing life is lengthened; At the same time ball of pottery and porcelain heats up coefficient of expansion low, when high speed runs temperature to rise, the steel ball that compares series of standard tightens force beforehand small, calorific amount is small. The course is compared, 1 what the rotate speed of series of ball of pottery and porcelain is series of standard about. 5 times, academic moving life can be as high as 3 5 times; When high rotate speed and high carrying capacity, tall tigidity needs to be satisfied at the same time, should consider to choose series of ball of pottery and porcelain, control the amount that add fat the 15% ~ 20% in space of bearing interior freedom. 3, this series is the main shaft bearing of high speed series P4S class, circle of inside and outside appears steel for 52100 complete temper by dipping in water commonly, scroll body can choose 52100 complete temper by dipping in water to appear steel or material of pottery and porcelain, and have open mode and bilateral blame contact is sealed type two sort. Below certain condition, the rotate speed with lubricant fat can be achieved 850, 000 DN ~ 1, 000, 000 DN, oil-lubricated can achieve 1, 700, 000 DN ~ 2, 000, 000 DN. High speed series applies at high rotate speed to machine equipment normally, for example milling machine of high speed machining center, high speed, because its can satisfy the use requirement of low calorific, low moving temperature and tall tigidity. This a series of main good point is: The first, scroll body diameter is reduced and number increase, the raceway appearance of accurate design, make roll the osculatory area of body and raceway is reduced, attrition is calorific decrease; The 2nd, when high speed runs, small size rolls body place suffers centrifugal force to reduce, skid as abate as spin phenomenon, the calorific quantity that contacts area decreases; The 3rd, outer lane all has on any account to block a shoulder inside, offerred more open channel for lubricant, can in time take away the quantity of heat of the generation in moving; The 4th, lubricant is right of scroll body cut influence decrescent, calorific quantity decreases. When rotate speed when the demand is higher, can you still choose the Timken with limited speed and dynamic taller tigidity? Series of high speed of ball of pottery and porcelain, reduce the calorific amount in moving further, realize lower moving temperature thereby. Does the contrast of in-house and calorific quantity of product of bearing of high speed series pursue right is the graph Timken©right: ? ?MMV9114HXVVSUL of hut Ke of Li Guo Qian (steel ball) with 2MMVC9114HXVVSUL (ball of pottery and porcelain) the calorific quantity contrast with product of internal diameter of 70mm of series of other brand high speed pursues. Test rotate speed is 11500 Rpm, small step tightens force to be 445 N beforehand, radial load 89 N, axial load 178 N. 4, Wear Ever exceeds nicety to fight wear away the circle of inside and outside of high-powered bearing of Wear Ever of main shaft bearing is used compress succumb the tall nitrogen steel with intensity and taller hardness, use material of pottery and porcelain to regard scroll as body, because this can resist hard contaminant, it is 100 times of wearability of 52100 bearing steel more traditional; Next, the group of inside and outside of Wear Ever material can support the scroll of 30% contacts bearing of prep above tradition stress, assured longer moving life thereby. In the meantime, this kind of bearing has prep above other body of scroll of the material tigidity of all range of products, pottery and porcelain, the special geometry of series of recombine high speed is designed, make this kind of bearing can achieve the acceleration that the rotate speed of 40% and traditional bearing cannot realize product of prep above tradition. CNC Milling
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