Standard Operating Procedure for Dry Burnishing Machine

1. Pre-Operation Inspection

1. Environment & safety: Verify proper equipment grounding; inspect dust extraction pipelines for damage and blockage; remove debris, oil and obstacles around the barrel.
2. Equipment condition: Check barrel and partition baffles for looseness, deformation or cracks; confirm door locks and sealing gaskets are intact; test motors, inverters and emergency stop buttons.
3. Consumables: Confirm abrasive type and particle size match the workpiece; ensure burnishing compound is free of hardening and impurities; maintain adequate abrasive volume without clumping of fine powder.
4. Workpiece pre-check: Parts must be degreased, cleaned and fully dried. Do not load parts with cutting oil, rust inhibitor, release agent or hand perspiration. Heavy flash, deep tool marks and large sharp burrs shall be removed in upstream processes; dry burnishing is only for micro-finishing.

2. Loading Specifications

1. Follow specified loading ratio and reserve tumbling space; avoid overfilling or insufficient loading.
2. Load separately in effective compartments. Separate large and small parts to prevent small components from being crushed, which causes collision marks and uneven color.
3. Add dry burnishing compound in specified proportion and distribute evenly among abrasives and workpieces; avoid pouring excessive compound at one time.
4. Ensure no foreign objects such as tools or screws are inside the barrel; close the door and fasten safety latches.

3. Startup, Operation & Process Control

1. Start the dust extraction system first; start the main machine only after dust extraction operates normally.
2. Call up the established program and set rotating speed, processing duration and forward/reverse cycle. For new product trials, conduct gradient tests starting from low parameters; do not use extreme speed directly.
3. Do not stand close to the rotating barrel during operation. Never open the door or reach into the barrel. Press emergency stop immediately in case of abnormal noise, severe vibration or unusual odor.
4. Monitor temperature rise. Dry friction accumulates heat. For titanium alloy, aluminum alloy and coated parts, adopt segmented processing with intermittent cooling to prevent discoloration and coating damage.
5. Observe dust condition. Excessive dust indicates broken abrasives or insufficient compound; adjust accordingly.

4. Shutdown, Unloading & Sorting

1. When processing finishes, stop the main machine first. Wait until the barrel completely stops before turning off dust extraction.
2. Unlock the door and unload gently to avoid secondary scratches from impact.
3. Separate workpieces from abrasives; sift out metallic dust and fine broken abrasives. Transfer qualified parts to cleaning or next processes; classify and record defective parts.
4. Clean dust and oil residues on barrel walls and baffles; remove caked deposits to avoid scratching subsequent batches.

5. Daily Maintenance & Shift Handover

1. Clean dust filter elements and pipeline deposits every shift to avoid dust hazards.
2. Inspect barrel bearings, drive chains and seals regularly; apply lubricant as required.
3. Implement scheduled abrasive top-up and full-bucket replacement. Replace abrasives when they become overly fine and lose cutting power.
4. Keep production records including part model, abrasive formulation, speed, duration, compound dosage and defects for process traceability.

6. Safety Prohibitions

1. Do not open the barrel door or reach inside while the machine is running.
2. Do not process flammable/explosive materials or oily uncleaned workpieces.
3. Do not operate continuously at excessive speed or overload.
4. Do not start the machine if the dust extraction system malfunctions.
5. Operators shall wear dust-protection PPE and maintain workshop ventilation.

Conclusion

Dry burnishing is more than simply loading and tumbling. Every step is interconnected. Strict compliance with this standard procedure stabilizes surface quality, reduces mass defects such as collision marks, uneven color and oxidation, lowers equipment failure rates and ensures long-term safe production.