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The "Leveling Up" Journey of Injection Molding Ejector Pins
In injection molding factories, tiny ejector pins fight a daily battle against high-temperature plastic. When plastic is mixed with glass fibers or talc, it becomes as hard as tiny blades, scraping the pin's surface. Pins made from ordinary materials wear out and crack quickly, needing frequent replacement.
New Materials Make Pins "Stronger"
High-speed steel (e.g., SKH51): Harder and 3 times more wear-resistant than ordinary materials, lasting up to 200,000 uses.
Powder metallurgy steel (e.g., ASP23): With a denser structure, it's even more wear-resistant, enduring 500,000 uses.
Cemented carbide (WC-Co): As hard as diamond, it helped an auto factory reduce replacement from once a month to once every six months, cutting maintenance costs by 80%.
"Magic Coatings" Add Extra Power
Coating the pins with films like TiN makes them smoother, reducing friction by 30% and preventing sticking. TiAlN coatings automatically form a protective layer at 300°C, resisting high temperatures.
As plastic types keep growing, each material upgrade boosts the ejector pins' "combat power," helping factories produce more durable plastic products.
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