Bronze Bushings (Tin Bronze/Aluminum Bronze):
Excellent impact toughness, absorbing sudden shocks and vibrations during press operation, preventing brittle fractures.
Ideal for low-speed, high-load applications (e.g., stamping, forging), whereas rolling bearings under impact loads are prone to pitting and cracking.
Steel Bushings:
High hardness but lack shock absorption, leading to micro-cracks under impact and premature failure.
Rolling Bearings (Ball Bearings/Needle Bearings):
Suitable for high-speed rotation but may deform or spall under heavy shock loads.
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Bronze Bushings:
Bronze alloys (e.g., tin bronze, aluminum bronze) contain graphite or lead, providing self-lubrication even under low or no oil conditions.
Excellent wear resistance, ideal for frequent start-stop or oscillating motion (e.g., punch press slide guides).
Steel Bushings:
Require external lubrication; failure to lubricate leads to rapid wear or seizure (galling).
Rolling Bearings:
Need regular grease replenishment and are vulnerable to contamination in dusty environments.
Bronze Bushings:
Copper’s thermal conductivity is 5–8 times higher than steel, efficiently dissipating friction heat to prevent localized overheating.
Can operate stably even at temperatures exceeding 200°C (392°F) under continuous use.
Steel Bushings/Bearings:
Lubricants degrade at high temperatures, leading to adhesive wear in steel-on-steel contact.
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Bronze Bushings:
Cheaper than high-precision rolling bearings and easier to replace (typically press-fit).
Longer service life with proper lubrication.
Rolling Bearings:
Expensive and require precise alignment during installation; misalignment causes early failure.
