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Hydraulic Forging Knuckle Press J84 GK Series

Knuckle Joint Press GK Series

As a type of forging press, the GK series knuckle joint press provides capacity ranging from 6300KN to 25000KN, with bolster size (mm) from 700*700 to 1200*1200.

Knuckle joint presses from 4000KN to 16000KN adopt integral structure, while 12000KN is split structure design.

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Features of knuckle joint press

The GK-630 series knuckle joint presses adopt pneumatic wet integrated friction clutch brake. The GK-800 to GK-2500 adopt pneumatic dry split friction clutch brake.
The mechanism of the machines is a crank toggle one, which allows the slide to dwell at the bottom dead centre for around 1/18 cycle.
The die height indicator’s accuracy display value is 0.01mm.
Mechanical lower ejector device is part of the standard configurations of the machines.
Controlled by PLC, the machine shows good precision and beautiful appearance. And it is widely applied in various find stamping and extrusion processes

GK SERIES MAJOR PARAMETERS

		Unit	J84-250	J84-400	J84-630	J84-800	J84-1200	GK-400	GK-630	GK-800	GK-1000	GK-1200	GK-1600	GK-2500
Nominal capacity		kN	2500	4000	6300	8000	12000	4000	6300	8000	10000	12000	16000	25000
Rating Point A.B.D.C. (Above bottom dead center)		mm	4	6	8	10	10	7	8	10	10	10	10	10
Stroke length		mm	120	160	160	180	200	200	220	180	250	250	200	200
Strokes per minute		SPM	50	40	35	35	25	25～40	20～35	35	20～30	20～30	25	30
Max. die height		mm	400	500	550	600	600	500	600	600	600	600	600	600
Slide adjustment		mm	15	15	15	15	15	15	15	15	15	15	15	20
Bolster Area	FB	mm	600	650	700	900	1150	680	700	800	1000	1000	1150	1500
Bolster Area	LR	Mm	640	630	680	1000	800	700	800	700	1200	1200	1000	1200
Slider Area	FB	mm	380	550	500	800	870	500	600	700	1000	900	900	1000
Slider Area	LR	mm	510	450	540	850	800	700	800	600	1020	1020	850	1000
Main motor		kW	11	30	45	55	75	37	45	55	75	90	110	160
Motor for adjustment		kW	0.5	1.5	2.2	3	3	3	3	3	3	3	3	5
Air pressure used		MPa	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6
The capacity of lower ejector		kN	Hydraulic 100	Hydraulic 200	Mechanical 200	Mechanical 400	Mechanical 500	Mechanical 300	Mechanical 300	Mechanical 400	Mechanical 300	Mechanical 400	Mechanical 500	Mechanical 600
Stroke length of the lower ejector		mm	50	50	60	80	75	100	100	105	120	120	80	80
Overall dimension	LR	mm	1930	2185	2200	4037	4570	4260	4540	4525	5200	5250	5300	6100
	FB	mm	1730	2125	2500	3160	3534	2740	3000	2645	3540	3600	3600	4000
	H	mm	3485	4310	4465	6250	7130	5950	6300	5630	7100	7500	7940	9200
Weight (net)		kg	12000	22000	32000	58000	95000	43000	57000	75000	97000	110000	130000	200000

Remarks: Specifications are subject to change without notice.

DIMENSION OF THE WORKTABLE PLATE AND SLIDE BLOCK

Model	A	B	C	D	E	F	G	H	I	J	K	L	M	N
J84-250	640	600	460	40	150	510	380	380	120	40	22	38	16	24
J84-400	630	650	260	50	300	450	550	200	300	—	28	48	20	28
J84-630	680	700	450	55	150	540	500	360	—	50	28	48	20	28
J84-800	1000	950	500	70	250	850	800	500	240	50	36	58	26	39
J84-1200	800	1150	500	80	250	800	870	500	240	50	36	58	26	39
GK-400	680	700	400	55	300	500	550	400	—	50	28	48	20	28
GK-630	680	700	400	65	300	500	550	320	—	50	36	58	26	39
GK-800	700	800	400	82	300	600	700	320	—	50	36	58	26	39
GK-1000	1200	1000	600	65	400	1020	1000	600	400	50	36	58	26	39
GK-1600	1000	1150	250	85	550	850	900	200	500	50	36	58	26	39
GK-2500	1200	1500	250	85	600	1000	1000	200	500	50	36	58	26	39

Bolster area

Slide Bolster Area

Remarks: Specifications are subject to change without notice.

Standard Configuration

● Pneumatic wet integrated clutch brake (6300Kn)

● Pneumatic dry split friction clutch brake (8000-25000Kn)

● Slide and die balancing device

● Motor-driven die height adjustment device (with the hydraulic locking device)

● Circulating centralized thin oil lubrication system

● Lower ejector device

● Mechanical rotary cam switch

● Digital die height indicator (0.01mm)

● Centralized operation panel (with indicator light)

● Frequency converter (10000-25000KN)

● Load monitor (10000-25000KN)

● Flywheel brake (12000-25000KN)

● Programmable controller

● Movable T-shape operation board

● Coupling for air source

● Coupling for air blowing

● Electromagnetic counter

● Operating instruction and precision inspection table

● Main motor reverse device

● Foundation bolt

Optional Configuration

● Photo-electric safety device

● Slide knock-out device

● Frequency converter (4000-8000KN)

● Load monitor (4000-8000KN)

● Flywheel brake (4000-10000KN)

●Automatic feeding system

● Quick die change system

● Mechanical rotary cam switch

● Shockproof sizing block

● Die lighting

● Convenience receptacle

Stroke-crank Angle Curve (as Exemplified by J84-400 Model)

Products Examples

Sketch Map for The Crank-toggle Rod Mechanism

Guangdong Metal Forming Machine Works Co., Ltd.

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