Knuckle Joint Press (NKJ)

GENERAL FEATURES

Knuckle joint press is ideal for forming operation where cloe tolerances are required. It is designed for operation which require slow but high force at lower zone of the stroke, therefore perfectly suited for coining, extruding, sizing and thick plate blanking. By virtue of the linkage system, the ram speed is very slow as it approaches the BDC. This low punch entry speed allows enough time to provide plastic flow of material during critical cold forming zone.

ADVANTAGE

In comparison to sheet metal forming, the cold forging technology can reduce the material waste form 40% up to 60%. One of the most >economical method for manufacturing high precision parts for metal. It also offers more accurate, stronger and longer life parts.

BETTER MECHANICAL CHARATERISTICS

Through the cold-forge procedure, the grain structure of steels is mini–eliminated to reinforce its resistance strength about two times. This advantage can improve the materials with better mechanical characteristics which are closer to tolerances, thus a lower cost material is allowed to be adapted for cold forging production.

HIGHER PRODUCTIVITY

Work pieces with the irregular thickness or the complex shapes as trapezoid, core or hollow cylinder etc, which is extremely difficult to produce by cutting forming, can be easily formed by cold forging technology.

SLIDE

The upper and lower slide are steel cast single pieces hinged to upper and lower link respectively through pins housed and profusely lubricated inside the slides. Unlike other presses, the slide adjustment mechanism is on the upper slide with taper–plate arrangement fixed at the top slide.

CLUTCH BRAKE

Combined Clutch & Brake are multi–disc type with non–asbestos liners profusely fins in the casting helps to dissipate heat. It is designed for instant engagement and disengagement and is easily accessible for maintenance.

LUBRICATION

Motorized forced feed lubrication is of re–circulating type which ensures adequate oil supply, depending upon the bearing area and guide–ways. It also ensures cooling of bearings, which results in long life of machine.

NKJ1

Knuckle joint linkage connects the upper and lower slides to creates and optimum motion curve. Sine curve is transformed and retarded to a flat curve as the slide approaches BDC. Such slide motion curve can ensure material to be formed/forged to a desire forming quality due to the slowdown of slide speed and longer period of forming.

Mechanical slide adjustment drive and hydraulic locking system ensures zero clearance of slide adjustment during operation, thus ensuring high quality of forged parts.

Technical Specifications


MODEL NKJ–160 NKJ–250 NKJ–400 NKJ–630 NKJ–1000
CAPACITY TONS 160 250 400 630 1000
TONNAGE RATING POINT MM 2.5 4 6 8 8
STROKE LENGTH MM 100 120 160 160 160
STROKE PER MINUTE(CONTINOUS) S.P.M 60 40 40 35 35
STROKE PER MINUTE(INTERMITENT) S.P.M 25 16 16 14 14
DIE HEIGHT(S.D.A.U) MM 250 365 400 400 500
BOLSTER AREA (LRXFBXHT) MM 400 X 400 430 X 570 550 X 650 600 X 700 700 X 800
SLIDE AREA (LR X FB) MM 360 X 400 430 X 400 430 X 500 450 X 550 450 X 550
SLIDE ADJUSTMENT MM 15 15 15 15 15
BOLSTER THICKNESS MM 90 100 120 150 150
MAIN DRIVE MOTOR HP 7.5 20 40 50 50

Bed Knockout

CAPACITY TONS 10 10 15 30 30
STROKE MM 50 50 60 70 70
  • Huge saving on material
  • Precision–size, precision–shaped parts
  • Tougher and stronger parts
  • Ready to assemble part, no finish machining
  • Cost efficient production