What are the steps for daily maintenance of stamping Dies?
Metal stamping and drawing dies are critical equipment for efficient mass production. Their condition directly impacts product precision, production efficiency, and costs. This article aims to standardize the daily maintenance procedures for dies. Through scientific cleaning, lubrication, inspection, and repair, you can extend die life, reduce failure rates, and ensure stable production.
1. Basic Preparation: Tool and Material List
A. Cleaning Tools: Copper brush (for scratch prevention), high-pressure air gun (for debris removal), special neutral detergent, dust-free cloth
B. Lubricating Tools: Manual grease gun (for grease injection), fine-nozzle oiler (for dripping oil), lubricating oil dispenser (for metered lubrication)
C. Measuring Tools: 0.01mm precision caliper, feeler gauge (for gap measurement), magnetic gauge base (for parallelism measurement)
Consumables: Extreme-pressure lithium-based grease (for heavy-duty components), precision lubricant (for guide pins and bushings), anti-rust oil (for short-term storage), spare wear parts (punches, springs, etc.)
2. Personnel Qualifications
A. Familiarity with die structure (e.g., blank holders and die radii in drawing dies, and convex-concave clearances in stamping dies) is required. B. Master safe operating procedures (e.g., wear cut-resistant gloves when working after powering off the machine).
3. Core Daily Maintenance Procedures
Pre-Work Inspection (before each machine startup)
A. Visual Inspection: Check the mold surface for oil stains, iron filings, and loose positioning pins and screws.
B. Key Component Functions:
C. Drawing Die: Test-operate the blank holder to ensure smooth lifting and lowering without jamming (to prevent workpiece wrinkling).
D. Stamping Die: Check the spring tension of the stripper plate to ensure it quickly returns to its original position after being pressed (to prevent material jamming).
E. Safety Devices: Verify that the protective plate and photoelectric sensor are unobstructed.
4. Inspections During Operation (recommended every 2 hours)
A. Observe Workpiece Quality: If cracks are observed in drawing parts or excessive burrs are observed in stamping parts, stop the machine immediately and inspect the cutting edge or clearance.
B. Monitor Die Sound: Abnormal noises may indicate a lack of oil in the guide pins or loose components and require prompt attention.
5. After-hours Maintenance (at the end of each production run)
A. Thorough Cleaning:
B. Use a high-pressure air gun to remove iron chips from the die grooves and scrap channels (to prevent accumulation and scratches on the workpiece).
C. Wipe the cutting edges and guide pin surfaces with detergent to remove residual stamping oil (to prevent corrosion).
D. Precision Lubrication: Guide pins and sleeves: Apply 3-5 drops of precision lubricant and manually slide to ensure even coverage. Sliders and blank holder tracks: Apply a thin layer of grease to avoid excessive contamination of the workpiece.
6. Status Record: Fill out the "Mold Maintenance Form," indicating statuses such as "Normal" and "Needs Edge Refining."
7. Regular Deep Maintenance (Weekly/Every 5,000 Strokes)
A. Clearance Check: Use a feeler gauge to check the clearance around the punch and die. If the deviation exceeds 0.02mm, adjustments are required (e.g., adding or removing shims).
B. Replacement of Consumable Parts:
C. Spring: If the free length decreases by more than 10% or cracks appear, replace immediately (to prevent breakage and die jamming). D. Punch: Regrind if cutting-edge wear exceeds 0.1mm. Regrind no more than three times (to avoid over-dimensioning).
E. Rust Prevention: During non-continuous production, spray the die surface with anti-rust oil and cover the cutting edge with anti-rust paper.
8. Troubleshooting Common Problems
A. Guide pin noise: Oil shortage or iron filings. Clean and relubricate. Check the guide sleeve for wear.
B. Wrinkling on the drawn part: Uneven pressure on the blank holder. Adjust the blank holder screws to ensure consistent clearance around the die.
C. Die edge cracking: Material hardness is too high or clearance is too small. Replace the die and recalibrate the clearance.
9. Recordkeeping and Archiving
A. Create a "Die History Sheet" to record the date, content, and part number of each maintenance.
B. Archiving Period: Retain for at least three years to analyze the die lifecycle and improve maintenance plans.
Note: This manual is applicable to cold stamping and drawing dies (material thickness 0.3-3mm). Special operating conditions (such as high-temperature alloy stamping) require a separate, dedicated plan.
Davinci Machine not only produces machines, but we also set up mold design and production departments to help customers develop and produce stamping Dies, injection molds, and die-casting molds for small home appliances and cookware. We are committed to providing one-stop service. If you have any mold needs or questions, please feel free to contact us.
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