Session Details

Session 11: Corrosion & Wear Deposit Coatings

Abstract Number:

12

Plastic molding requires high equipment operation efficiency and ‎low defect rates to reduce production unit costs. When the ‎chromium oxide film we developed is applied to mold dies in ‎conjunction with another enhancement, remarkable improvements ‎can be achieved to prevent wear, corrosion, contaminant adhesion ‎and mold release failures. As a result, this can improve the mold die ‎life and production cycle time, and reduce product defects and ‎maintenance time.‎

Topics:

Corrosion or Wear Deposits/Coatings
Technologies for Improved ‎Performance or Increased Efficiency

Plastic molding is an indispensable method for the mass production ‎of industrial products. Plastic-molded products are extensively used ‎in daily life, such as for plastic water bottles and a variety of cases ‎and containers. They are also widely utilized in automobiles, ‎airplanes, machining tools, and electronics. ‎
In recent years, in light of climate change, many countries have been ‎promoting the weight reduction of automobiles, and some ‎automobile parts materials have been replaced by lighter metals and ‎plastics. For parts requiring strength and heat resistance, including ‎engine parts such as water pumps and intake manifolds, engineering ‎plastics such as POM, PA and PBT and super-engineering plastics like ‎PPS and PEEK are used instead of standard plastics.‎
In addition to cutting to make parts, there are other mass production ‎methods such as stamping and plastic molding using dies. Dies and ‎molds are generally made of high-strength steel called die/mold ‎steel. When processing metal materials like iron and aluminum, the ‎surface of the die/mold is coated with a very hard film to prevent ‎wear.‎

On the other hand, the surface of molds/dies for plastic molding ‎rarely wears, except when a hard filler such as glass is added to the ‎plastic material. Still, there are other problems that can occur ‎besides wear, such as corrosion, gas (deposit) adhesion, and mold ‎release failures. Such problems can result in a decrease in ‎productivity and degradation of product quality.‎
We will report on the characteristics of chromium oxide films ‎deposited by physical vapor deposition (PVD) in a vacuum chamber, ‎where the raw material metal is ionized and deposited on an object ‎such as a die. We will also present some case studies where such ‎chromium oxide films resolved the issues described above.‎

PROPERTIES OF PVD-DEPOSITED CHROMIUM OXIDE FILMS TO SOLVE MOLD DIE PROBLEMS IN PLASTIC MOLDING

Chikara Matsuda

TL (Thin Layer) Engineering Manager

Yuken Industry Co., LTD