B4-KH-28-A meterGMDXX GMDXXGMDXX Flender GmbH Flender MD Bevel-helical speed reduction gearboxes B4

Flender/Flender Gear Units/Bevel-helical speed reduction gearboxes B4

utting edges. The thermal load is increased as result of the rise in grinding speed, and more of the cooling lubricant fed to the wheel is spun off due to increased centrifugalforces. Guide values for the grinding speed are 1 / in generation grinding and 1 / in plunge grinding. Eccentric Motion According to Waguri In 1, the development of an addi- tional oscillating motion was published in Japan. The grinding spindle bearing ismounted in separately driven eccentric bushing. The degree of eccentricity cannotbe varied. If the eccentric drive is activated, the grinding wheel performs anoscillating motion in addition to its main rotation (grinding motion), interruptingthe wheel-to-work piece contact. This allows an improved cooling lubricant feed;this is particular advantage in plunge grinding. In generation grinding, it ispossible to inuence the surface structure with the aid of the eccentric motion. The ratio between the grinding wheel and eccentric bushing speeds, termed the eccentric factor, is variable and is chosen as function of the grinding wheeldiameter (see Table 6.. It is necessary to take into account that the oscillation of the grinding wheel must not excite the grinding machine at an unfavourablefrequency as the resulting grinding quality will deteriorate. Direction of Rotation of the Grinding Wheel The direction of rotation of the grinding wheel should in general be opposed to the generating direction to avoidmaterial jam. If the gear geometry makes this impossible, or in plunge grindingoperation, the direction of rotation which allows better grinding oil supply to thecontact point should be chosen. Distribution and Reduction of the Grinding Stock In order to minimize grind- ing time and the risk of grinding burn, it is important to distribute grinding stockTable 6.5 Guide values for the eccentric factorGrinding wheel diameter [mm] Eccentric factor 5 0.2.3 7 0.3.8 1 0.5.3 0.5.8 0.7.5 Above 3 1.1.0.5 Grinding Spiral Bevel Gears 2 removal evenly bet