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The design on high speed motorized spindle axis
  • Published:Update:2014-05-05 17:05:11
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   As the machine tool to develop in the direction of high speed, high precision, high power, the structure of the machine tool rigidity is getting better and better, and the combination of spindle and tool face is still using standardized 7/24 taper fit for many years.Analysis shows that, the tip deformation of 25% ~ 50% comes from 7/24 taper connection, only about 40% of the deformation is the result of the main shaft and bearing.Therefore, the spindle axis reasonable design have nots allow to ignore.
    Under the high speed processing requirements to ensure high speed spindle and tool connection status can't change.However, the effect of the front end of the high-speed spindle due to centrifugal force makes the spindle (as shown in figure 3), such as 30 taper spindle front at 30000 r/min, the expansion amount for 4 ~ 5 (including m, however, 7/24 of the standard solid the handle will not have such a large amount of expansion, so the connection stiffness is reduced, and the cutting tool of axial position will be changed.The expansion of the main shaft can also cause the handle and the clamping mechanism of center of mass, thus affect the dynamic balance of the spindle.To ensure that the connection is still reliable under high speed contact position, need a large amount of interference to offset the spindle axis of the expansion, such as standard size 40 cone to the initial interference amount for 15 ~ 20 (including m, and the additive interference was needed to eliminate cone with tolerance zone.Such large interference quantity to produce very big pre-tightening force to pull rod, and tensile strength of the tie rod to produce such big very hard commonly, exchange knife is very bad, still can make main shaft inflation, have adverse effects on main shaft bearing before.Design a kind of face location and has a great deal of friction surface to prevent the expansion of the main shaft knife shaft connection structure, can solve the above problem.
    Due to the high speed spindle component requirements for dynamic balancing is very high, so the cutting tool and the clamping mechanism also needs precise dynamic balance.However, transfer torque balance key and keyway is easy to damage.Combined with the tolerance zone can make the tool to produce radial runout, cause imbalance.Keys are used to transmit torque and angular orientation, and someone is trying to study a knife/shaft connection ways can produce very big friction to achieve in the joint torque transfer, marked on the handle method is used to implement installation angular positioning, achieve the goal of the cancel button.
    In a wide range of high speed cutter/shaft connection scheme, has been DIN standard HSK short taper shank with structure is suitable for high speed spindle.The handle using 1:10 taper, shorter than 7/24 of the standard taper, taper shank part adopts thin-walled structure, the handle with short cone and end at the same time the axial location (as shown in figure 4).The structure of the main shaft and the handle joint special strict tolerance zone, only for 2 ~ 6 (including m, because of the short cone strict tolerance and elastic thin wall, under the action of axial tension rod, short cone will produce certain shrinkage, so the handle of the short cone and flange end face is easier to contact with the corresponding surface closely the spindle, realizes the cone and end face positioning at the same time, thus has high precision and rigidity connection.When spindle at high speed, while the spindle shaft end will produce a certain degree of expansion and shrink short cone part stretching, but short cone and the spindle taper hole still keep good contact, spindle speed has little influence on the connection performance.

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  • Tel:0769-85396950/85331816  Technical Director:18925811046    MR Liu     Fax:0769-82288950
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