Process Flow of a Stamping and Forging Machine

Process Flow of Open-Type Punching Machine (Open-Type Press)

The core process includes equipment & mold preparation → feeding & positioning → stamping cycle → quality control → shutdown & finishing, focusing on safety, precision and efficiency throughout the operation.

1. Pre-Production Preparation (Basis for Safety & Precision)

Equipment Inspection and Lubrication

Clean foreign matter from the worktable, guide rails, and mold mounting surfaces.Check the integrity of the frame, slide, clutch, brake, and safety devices (two-hand buttons, photoelectric protection).Lubricate friction parts such as guide rails, connecting rods, and clutches.Check air pressure (pneumatic press ≥ 0.55 MPa), electrical circuits, and emergency stop button.Run idle for 1–2 minutes and jog the slide to confirm reliable operation of top/bottom dead centers, stroke, and braking.

Mold Installation and Adjustment

Stop the slide at the top dead center. After power-off, install the upper mold (fastened to the slide) and lower mold (clamped to the worktable), then correct concentricity and shut height.Adjust the connecting rod length, lock it, then power on and jog to check mold clearance, stripping/ejecting mechanism, and smooth scrap discharge.

Material and Tool Preparation

Verify sheet/coil specifications, material, and surface quality.Prepare feeders, positioning fixtures, safety tools, and measuring tools (calipers, micrometers).Uncoil, level, and straighten coil stock, and set feed pitch (deviation ≤ 0.2 mm).

2. Test Stamping & First Article Confirmation (Prerequisite for Mass Production)

Jog Test Stamping

Place one workpiece in single mode, step on the pedal or press the two-hand button to stamp one piece.Check dimensions, burrs, cracks, and indentations.

First Article Inspection

Measure key dimensions (aperture, profile, hole positions) to ensure compliance with drawing tolerances (e.g., φ5 mm hole ≤ ±0.03 mm).Fill out the First Article 

Inspection Record. Mass production can only start after confirmation by quality control or team leader.

3. Mass Production (Stamping Cycle)

Feeding and Positioning

· Manual: Use a safety hand tool to place sheets into the mold positioning groove; never reach into the die area.

· Coil: Automatic feeding by feeder with accurate pitch.Stamp only one piece at a time; no overlapping material.Remove scrap promptly with a hook or brush; do not touch by hand.

Stamping Cycle (Mechanical / Pneumatic Principle)

Motor → Flywheel energy storage → Clutch engagement → Crankshaft rotation → Connecting rod drives slide down → Die blanking / forming → Slide up → Brake actuation → Slide stops at top dead center → Stripping / ejecting → 1 stroke completed.

Modes:

· Inching: Restart required for each stroke.

· Continuous: Automatic cycle, requiring two-hand / photoelectric protection.

Process Monitoring

Inspect 1 piece for every 10 produced.Check mold temperature (≤ 60 °C; stop and cool for 10 minutes if overheated), edge wear, and feeding accuracy hourly.Monitor abnormal noise and vibration. Stop immediately and cut power in case of material jamming or edge chipping.

4. Post-Stamping Treatment & Shutdown

Workpiece & Scrap Handling

Place stamped parts in special trays and store by category.Collect scrap centrally and clean regularly.

Normal Shutdown

After production, stop the slide at top dead center. Cut off power and air supply.Clean oil and debris from the worktable, mold, and equipment surfaces.

Mold Removal & Maintenance

After power-off, loosen upper mold bolts, raise the slide and remove the upper mold.Loosen lower mold clamps and take out the lower mold.Clean the mold, apply anti-rust oil to cutting edges, and store by specification.

5. Key Safety & Quality Requirements

· Safety Rules: Keep hands outside the die area at all times; no illegal continuous stamping; stop and cut power for jammed molds; keep foot away from pedal when not in use.

· Quality Control: Mandatory first article inspection, in-process sampling, and last article comparison. Control blanking clearance, mold temperature, and feeding accuracy to reduce burrs and dimensional deviations.