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JH21
WORLD
-application: sheet metal cold forming or hot forging
-transmission: crankshaft with flywheel (wet type pneumatic clutch and brake)
-control system: PLC with HMI
HIGH RIGIDITY PRESS BODY
The press body is steel welded with high quality steel plates 
by carbon dioxide arc welding.
All the weld seams must pass the examination of ultrasonic inspection.
The transmission gear house is tested by oil bath to avoid any oil leak.
Then, the press body will be heat treatment and sand blasting.
The welded stress will be released after all above treatment to ensure
the high rigidity. The full structure is optimized by computer and all the
key power points are strengthened by thicker steel plate or adding
reinforcement ribs. Multi-pass welding is used on the stiffened plate on
the throat.
HIGH PRECISION FOR PUNCHING AND STAMPING
The press body is milling and boring by PAMA machine center and all 
the surfaces and holes will be finished machining in one time.
JH21 C frame press uses rectangular type lengthened slide guides
with bronze plates for higher guide precision.
Table surface is grinded by high performance grinding machine for
better flatness.
Slide adjustment precision is only 0.1mm
(for 60ton press and bigger models).
Crankshaft is under roller pressing treatment for better roughness.
Gears are grinding, high precision and lower noise.
WET TYPE COMBINED PNEUMATIC CLUTCH AND BRAKE
Press with pneumatic clutch can work as continuous, inches or single
stroke, more choices for operators.
All the friction discs and pressure plates are oil bath in the flywheel house.
Better lubrication and heat radiation ensure longer service life.
Lower noise than dry clutch and lower maintenance cost. Just need to
change the oil every half year, no need often to change the friction discs.
Brake system can stop the press at any point especially for emergency stop.
The clutch uses high quality friction discs and seals. Special Y type seals
ensure no oil leak.
All clutches are under balance testing and temperature testing before
assembling to the press.
EASY AND SAFE OPERAITON AND MAINTENANCE
The press is standard equipped with hydraulic overload system. Normally 
the system is set as 110% of the nominal capacity. The press will stop
immediately once it is overload than 110% to protect both the press and
the die. It is easy to reset the overload as there is a reset switch on the
control panel. The system can be reset within 3 minutes.
Anti-repeat system is equipped to protect the operator when the press
works as single stroke mode. Emergency stop button is on the control
panel to stop the press ram immediately if any dangerous happens.
Auto grease pump is also standard equipped and the operator can set
the lubrication frequency by the HMI according to the working time or
working stroke times.
HMI with setting function, I/O monitor, counter and preset counter.
The press has both mechanical and electrical cam controllers.
It is easy to set the cam angles to match the press with automatic
feeding system or transfer system.
Motorized slide adjustment with digital shut height indicator, precision is 0.1mm.
-application: sheet metal cold forming or hot forging
-transmission: crankshaft with flywheel (wet type pneumatic clutch and brake)
-control system: PLC with HMI
HIGH RIGIDITY PRESS BODY
The press body is steel welded with high quality steel plates
by carbon dioxide arc welding.
All the weld seams must pass the examination of ultrasonic inspection.
The transmission gear house is tested by oil bath to avoid any oil leak.
Then, the press body will be heat treatment and sand blasting.
The welded stress will be released after all above treatment to ensure
the high rigidity. The full structure is optimized by computer and all the
key power points are strengthened by thicker steel plate or adding
reinforcement ribs. Multi-pass welding is used on the stiffened plate on
the throat.
HIGH PRECISION FOR PUNCHING AND STAMPING
The press body is milling and boring by PAMA machine center and all
the surfaces and holes will be finished machining in one time.
JH21 C frame press uses rectangular type lengthened slide guides
with bronze plates for higher guide precision.
Table surface is grinded by high performance grinding machine for
better flatness.
Slide adjustment precision is only 0.1mm
(for 60ton press and bigger models).
Crankshaft is under roller pressing treatment for better roughness.
Gears are grinding, high precision and lower noise.
WET TYPE COMBINED PNEUMATIC CLUTCH AND BRAKE
Press with pneumatic clutch can work as continuous, inches or single
stroke, more choices for operators.
All the friction discs and pressure plates are oil bath in the flywheel house.
Better lubrication and heat radiation ensure longer service life.
Lower noise than dry clutch and lower maintenance cost. Just need to
change the oil every half year, no need often to change the friction discs.
Brake system can stop the press at any point especially for emergency stop.
The clutch uses high quality friction discs and seals. Special Y type seals
ensure no oil leak.
All clutches are under balance testing and temperature testing before
assembling to the press.
EASY AND SAFE OPERAITON AND MAINTENANCE
The press is standard equipped with hydraulic overload system. Normally
the system is set as 110% of the nominal capacity. The press will stop
immediately once it is overload than 110% to protect both the press and
the die. It is easy to reset the overload as there is a reset switch on the
control panel. The system can be reset within 3 minutes.
Anti-repeat system is equipped to protect the operator when the press
works as single stroke mode. Emergency stop button is on the control
panel to stop the press ram immediately if any dangerous happens.
Auto grease pump is also standard equipped and the operator can set
the lubrication frequency by the HMI according to the working time or
working stroke times.
HMI with setting function, I/O monitor, counter and preset counter.
The press has both mechanical and electrical cam controllers.
It is easy to set the cam angles to match the press with automatic
feeding system or transfer system.
Motorized slide adjustment with digital shut height indicator, precision is 0.1mm.
