The installation of high speed bearing deserves to close and be adjusted

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  • source:BERO CNC Machining
1. Of high speed bearing cooperate to want to ask by high accuracy bearing already as a result of high speed bearing with windage, want to ask by high temperature bearing again, in the consideration so its cooperate and when windage, want take into account below at 2 o'clock: (1) rises to change to the size variation when high temperature and hardness by normal temperature; (The strength that causes from mental efforts place below 2) high speed fastens change and appearance change. Anyhow, below the condition of high speed, high temperature, from the precision that cooperate and do one's best wants to maintain bearing on the choice of windage and character of service, this has difficulty. The raceway after be being installed to assure bearing is out of shape small, be filled with assorted interference to cannot be obtained too too big, and the heat below the centrifugal force below high speed and high temperature expands, or it is the standard that countervail coordinates the surface to pressure. Or it is to make coordinate a side flabby, because this interference must be below the premise that considers two kinds of afore-mentioned factors,try carefully to calculate, in normal temperature constant fast next effective interference are likely to high speed bearing it is invalid. If calculate this contradiction is too big as a result (be in only normally exceed the ability below high speed to have) of this kind of circumstance, take ring only next lubricant laws and static the double and lubricant measure that control lubricant standard and uses, and this kind of plan makes the Dmn of bearing is worth a breakthrough likely of 3 million close greatly. When considering windage of high speed bearing not only should consider each afore-mentioned factors, and the heat that should consider an axis is stretchy the influence to windage, demand bearing falls in working status, there is first-rate windage below working temperature namely, and this kind of windage is inside, center of channel of outer lane ball forms below the condition of accurate counterpoint. Because do one's best of high speed bearing is reduced,slide relatively and internal friction, had better not use will inside, the windage that axial of outer lane edge adjusts ball bearing relative to the method of amlposition. Interference and windage cooperate in what consider bearing when, want to notice the characteristic that material becomes loose below high temperature and allows changeful entity, and cause possibility of certain and permanent metabolic to the temperature change of high temperature by normal temperature for many times. 2. To lead plane the bearing of requirement high speed of relevant spare parts asks bearing is in circumgyrate system to pass accurate dynamic balancing, axis and the dimension precision that Kong An installs the place of bearing to should have prep above to ask commonly and form precision, coaxial is spent and block a shoulder to be opposite especially the verticality of an aperture or journal, and when considering these issues, must observe the high speed element when bearing runs and high temperature element likewise. Axial bearing system asks tigidity is tall already, ask again quality as far as possible light, to overcome this contradiction, can adopt such as to reduce the surface surface roughness and raise the arrange inflict such as exterior aggrandizement to raise bearing stiffness, use hollow axis to wait in order to reduce systematic quality. 3. The development example at present that exceeds high speed bearing is with exceeding the development of bearing of high speed HA tapered roller exemple. (Of 1) problem in putting forward to reach certain machine tool and project machine in gas turbine, high speed and axial negative charge is big, use ball bearing criterion service life is too brief, use short columnar roller capacity of bear of bearing criterion axial is insufficient, axial windage is hard to adjust, the hope uses tapered roller bearing to break through this difficult problem. (The technical key that the technical key that 2) must solve raises high speed of tapered roller bearing to restrict depends on improving the lubricant position between inner ring big rib and face of roller main aspects, this place happens the most easily when high speed acuteness wear away and burn, it is the main reason that restricts its high speed to change. (3) settles way in the tapered roller bearing of common structure, the current line of lube mains aspects in inner ring big rib and roller surface contact place is very god-given to lube, and this place is relatively slip big, just needs lube most again. Accordingly, the country such as Japan developed bearing of HA tapered roller, rib of this kind of bearing is outer circle, so current lube mains aspects with respect to rib of can lubricant outer lane and roller the osculatory place of the face, at the same time although here is in dormant when also can store some of oil, prevented the accident of burn of the lean oil when starting, but a few hole that discharge oil are opened by need on outer lane rib, do not have eduction passageway in order to prevent oil, the dynamical loss that retention causes oily agitate at some place and temperature rise are exorbitant. Because inner ring does not have rib, temperature is reduced somewhat, decreased consequently the possibility that peristalsis produces between the face cooperates between inner ring and axis. The bearing of this kind of structure uses means of outer lane guiding to cage, make cage guides roller smoothly not to send askew ground normal movement, avoid to happen vibration and excessive wear away, this also is helpful for high speed. (The Dmn value of this kind of HA bearing can amount to the result that 4) can achieve 2 million, compare common structure rise double, this kind of bearing that is used at main shaft of gas turbine reducer for example (model is I-IA30205) , below the condition of axial bear 1000N, the quantity giving oil that assures Min of ／ having 2L executes a loop to furnish to bearing 4 turbine are oily, its job rotate speed can be amounted to 60 thousand turn and do not send occurrence burn. (End) CNC Milling CNC Machining