Cylinders 101
FOR SAFE OPERATION
- SWITCH OFF power before setting, inspecting, lubricating or changing the cylinder. Danger by catching operator in a machine.
- Use built-in lock/relief valve and route solenoid valve so as to clamp even if power is interrupted. (Model F0714N and F0833N aren’t equipped with lock/relief valve, be sure to use them together with the chuck which incorporates selflock.) Danger by discharge of clamping workpiece.
- Never turn off the power of hydraulic pump and operate selector valve and solenoid valve during spindle rotation. Danger by discharge of workpiece related with lowering gripping force caused by insufficient lubrication.
- Cover the periphery of cylinder. Danger by catching of operator in machine.
- Secure the clamp bolts! Danger by discharge of workpiece in case of damaging of cylinder.
- Secure the draw tube. Danger by discharge of clamping workpiece.
- Set the piston at stroke end on pushing side. (Set the piston at stroke end on pulling side only Model F08.)
- Never shock! Danger by discharge of clamping workpiece in case of damaging of cylinder.
- Set hydraulic pressure to chuck specification. The maximum hydraulic pressure of cylinder is 4MPa. (40.8kgf/cm) (Model F0714N and F0833N are 2.5MPa.) Danger by discharge of clamping workpiece in case of damaging of cylinder.
- Never attempt to operate a machine while taking medicine or alcohol. Danger by operational fault and lowering judgement.
- When mounting or unmounting the cylinder, use a lifting belt. Danger by dropping.
- Turn off power source and supply specified oil. Danger by discharge of workpiece incompletely gripped because of slow operation speed or insufficient thrust.
- Incorporate a filter in pressure supply line. Danger by discharge of workpiece because cylinder may seize if foreign matter is entered into cylinder.
- Coat the threaded part of draw tube with adhesive and screw it with the specified torque. Danger by discharge of workpiece. Because screw becomes loosened, the jaw stroke of the chuck becomes short.
- Vertical mounting is impossible. Danger because there is a possibility that fire occurs from oil leakage.
MOUNTING OF CYLINDER
Mount the cylinder with the drain port on the bottom. Otherwise, the hydraulic oil will overflow from both ends of the sleeve body because of the cylinder structure.
IMPORTANT In order to prevent the rotation of the cylinder sleeve body, provide a support utilizing the projections on the drain port base.
After the support is mounted to the lathe, retain the clearance between the projected part of the sleeve body and the support so that the sleeve body will not be subjected to loading. (Fig. 5.)
When mounting the cylinder, mount the support (anti-rotation bracket) for the sleeve body. The run-out of the periphery of the cylinder and of the upper and lower movement of sleeve body’s rear end must be less than the standard values as shown in table Fig. 6.
MOUNTING OF CYLINDER ADAPTER
When mounting the cylinder adaptor to the lathe after integrating it to the cylinder, vertically place the adaptor as shown in the following figure. Fix the tester onto the V-block made of JURACON and center the cylinder adaptor according to the periphery of the cylinder. (0.010 or less.)
MAINTENANCE AND INSPECTION OF CYLINDER
When the oil leakage observed, disassemble the cylinder for clearing and replacement of O-ring. At the time, handle the cylinder with care as it partly uses the light alloy.
HYDRAULIC UNIT
Clean the suction strainer in every 2 to 3 months.
Check the hydraulic oil in every half year and replace it if it is deteriorated.
WARNING
When operating the machine with maximum hydraulic pressure and maximum speed, disassemble it at every 250 thousands of use and replace the seal and check each component.
When surge pressure is greatly applied, thereby causing cylinder failure and damage. Therefore, adjust the throttle valve to reduce the surge pressure.
TROUBLESHOOTING OF CYLINDER
INOPERATIVE PISTON
Confirm from the motion of the flexible hose that the hydraulic pressure is working.
Confirm that the piping is correctly arranged.
Follow the procedures described under Test Run to correct the inoperative piston.
INSUFFICIENT CYLINDER PROPULSIVE FORCE
Apply the pressure gauge near the entrance of the cylinder and confirm that pressure in the cylinder pipe entrance confirms to the specified value.
If the pressure of piping at return side is high or drain flow is more than a normal condition, it is considered that the inside O-ring are worn.
TEMPERATURE RISE
Confirm that the hydraulic oil had the specified viscosity.
Replenish the hydraulic oil in the tank if it has decreased.
When heat dissipation of the tank is not so good as desired due to high room temperature, control the oil temperature by cooler or fans.
PUMP NOISE
Avoid suctioning of air.
Replenish the hydraulic oil if it has decreased.
When the considerable dirt is deposited inside of the hydraulic tank or when the hydraulic oil has deteriorated, it is probable that the pump has been abnormally worn out needing repair.
LEAKAGE OUT OF THE LABYRINTH
Set the drain hose with a flowing grade in order to eliminate air pockets.
Return drain to the oil face of the hydraulic unit.
Check to see that the air breather of cylinder or hydraulic unit is not clogged with dirt, etc.
