1475 Каталог KENNAMETAL 2013 Инструментальная оснастка для металлорежущих станков Стр.M75

Каталог KENNAMETAL 2013 Инструментальная оснастка Стр. M75 1475 Lab2u

Technical Information K XKENNAMEUL Balancing Balancing (continued) The balance quality is usually specified by the balance grade G, according to ISO 1940-1 and ANSI S2.19 standards. The balance quality grade (G) was derived from practical experience, which is expressed in millimeters per second (mm/s) and ranges from 0,16-4000. For rotating tooling and general machinery parts, it is usually specified to be G 2.5 or G 6.3. A lower number designates better balance quality. The permissible residual unbalance can be calculated by the following equation: .. 9549 x G x M U per = n Where: Example: U per = permissible unbalance, expressed in gram millimeters (gmm) Rotor mass = 2 kg G = desired balance grade n = 10,000 RPM M = rotor mass in kilograms (kg) Desired balancing grade = G 6.3 n = operating speed in rotations per minute (RPM) ii = 9549 x 6.3 x 2 12 gmm U 10,000 = 12 gmm The same value can be obtained from the chart on the following page. It gives the permissible specific unbalance in gram millimeters (gmm) as a function of the rotational speed and the balance quality (G). For the example above, at 10,000 RPM and for grade G 6.3, the maximum residual unbalance would be 6 gmm/kg. The toolholder assembly (including the tool) has a mass equal to 2 kg, the permissible unbalance is (6 gmm/kg) x 2 kg , which equals 12 gmm. (continued) Wh KENNAMETAL M75 Technical Information