附件24.3 Problem 8-2 Chapter 9 9-1 In some rotation transmission devices with larger quality such as centrifugal machines and roller machines,the load of motor is virtally afly wheel.The on casting fly wheel is Im in outer diameter,200mm in width.100mm in joural radius and under a heavy burden of 12.5kN.The transmission ratio of gea supercharge mechanism i=m/n2=0.2(see Problem 9-2).the steady speed of the fly wheel is 200r/min. Accelerating or decelerating time is set as 2s.The mechanical efficiencies of the hydraulic motor and the gear supercharge mechanism are 0.95 and 0.90 respectively.and the static and dynamic friction factors of the oumal a e2 respectively.Draw the load cirele chart of the hydraulic motor and calculate the largest 9-2 For a horizontal drilling modular machine tool with single-surface and multiple shafts,the working circle of the dynamic slipway is:quick feed-working feed-quick return-end.Requirements for the main performance of this hydraulic system are:axial cutting force F=24000N;total weight of the slipway moving parts is accelerateor decelerate time is2s,the static and dynamic friction factors are2 and 0.1 when flat guide rail is mploye the quick feed stroke and orking feed soke and 100mm respectively,the quick feed speed and quick retract speed are equal and is 3.5m/min,the working feed speed ranges from 30mm/min to 50mm/min.Try to design such a dynamic slipway hydraulic system with the 附件 24.3 Problem 8-2 Chapter 9 9-1 In some rotation transmission devices with larger quality such as centrifugal machines and roller machines, the load of motor is virtually a fly wheel. The iron casting fly wheel is 1m in outer diameter, 200mm in width, 100mm in journal radius and under a heavy burden of 12.5kN. The transmission ratio of gear supercharge mechanism i＝n1／n2＝0.2(see Problem 9-2),the steady speed of the fly wheel is 200r/min. Accelerating or decelerating time is set as 2s. The mechanical efficiencies of the hydraulic motor and the gear supercharge mechanism are 0.95 and 0.90 respectively, and the static and dynamic friction factors of the journal are 0.2 and 0.08 respectively. Draw the load circle chart of the hydraulic motor and calculate the largest output torque. Problem 9-1 9-2 For a horizontal drilling modular machine tool with single-surface and multiple shafts, the working circle of the dynamic slipway is: quick feed→working feed→quick return→end. Requirements for the main performance of this hydraulic system are: axial cutting force Ft＝24000N; total weight of the slipway moving parts is 5000N;the accelerate or decelerate time is 0.2s; the static and dynamic friction factors are 0.2 and 0.1 when flat guide rail is employed; the quick feed stroke and working feed stroke are 200mm and 100mm respectively; the quick feed speed and quick retract speed are equal and is 3.5m/min,the working feed speed ranges from 30mm/min to 50mm/min. Try to design such a dynamic slipway hydraulic system with the