• Grewal Industries

Forging Screw Presses

Grewal Industries (Regd) manufactures a range of power presses. The quality of every part fitted in the machines is thoroughly checked by experienced and qualified technicians. The complete manufactured machine is individually checked and passed after a successful trial. Forging screw presses are specially designed to make bolt-heads of any kinds of bolts, nuts, rivets, spikes, motor parts, half shaft axle, engine valves, brass parts, cold bending jobs, etc. These presses are friction drive screw presses on which the forging blows are applied in an upward direction. The main frame of the machine is of cast iron with tested hardness and generous proportions and is supported by necessary ribs. The main spindle carrying the friction discs runs on roller bearings fixed in brackets and bolted on the frame. Between, the brackets friction discs are mounted, which drive the friction wheel. Thus imparting motion to an alloy steel screw fixed with keys and bronze nut to it. The screw nut is secured to the top crosshead of frame type ram. This ram moves axially upward when the screw, which has no linear movement, rotates. The bottom forging die is carried on the lower cross head of the ram while the top die is secured to a fixed bridge in the machine frame. This bridge simultaneously locates the lower bearing (the screw pressure bearing). Due to these design principle, the forging forces do not act on the machine frame but are entirely sustained by the ram. The machine frame resists the low torsional forces generated by screw nut and flywheel. An ejector to bring out the pieces is provided at lower part of the ram. The company can provide pneumatic control system and slip ring clutch at extra cost in which the flywheel is connected to the screw through spring loaded slipping clutch. In case of over loading the clutch slips, thus avoiding costly breakdown on the press.