Stamping press noise generally originates from normal operational forces, mechanical wear, or equipment overloading. The main causes of press machine noise include:
1. Stamping Process & Breakthrough (Snap-Through)
- Punch Impact: A primary source of noise is the direct mechanical shock created when the punch strikes the sheet metal.
- Breakthrough / Snap-Through (ブレークスルー): During blanking or piercing, when the material fractures, the heavy compressive load stored elastically in the press frame, slide, and crankshaft is instantaneously released. This sudden energy release creates severe shock, frame vibration, and a loud bang (often exceeding 105 dB(A)).
2. Machine Overloading
- Exceeding Press Capacity: A sharp, abnormally loud noise accompanied by heavy vibration near Bottom Dead Center (BDC) indicates that the press is being overloaded beyond its allowable pressure or torque capacity.
3. Mechanical Wear and Lubrication Issues
- Insufficient Lubrication: A lack of proper lubricating oil on sliding parts (such as slide guideways) or bearings leads to severe friction, heat, and squealing/grinding noises.
- Worn Parts & Mechanical Play: Wear in gears, bushings, crank pins, or connecting rods introduces excess clearance, resulting in knocking or clattering sounds during stroke cycles.
- Loose Fasteners: Loose bolts, nuts, or mounting screws across the frame, bolster, or die assembly produce rattling noises under vibration.
4. Drive, Clutch, Brake & Auxiliary Equipment
- Clutch & Brake Operation: Abnormal clicking, clacking, or grinding sounds occur when clutch linings or brakes are worn, slipping, or out of adjustment.
- Rotational Imbalance: Imbalances in heavy rotating or reciprocating masses (such as the flywheel or crankshaft) cause continuous structural vibration that radiates as noise.
- Auxiliary Devices: Peripheral systems like scrap cutters, pneumatic exhaust valves, die cushions, and air-ejection nozzles directly contribute to total machine noise.
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