Company Summary

Hitachi Powdered Metals (USA), Inc. has been supplying the highest quality, technologically advanced powdered metal products in North America since 1989. Our customers know they can rely on us to deliver the most innovative designs while maintaining stringent tolerance requirements.



Hitachi Powdered Metals (USA), while the dominant Valve Guide supplier in North America, also manufactures Structural parts (timing pulleys, sprockets/VCT, and sensor plates) primarily for the automotive industry. The remainder of our product line supports motorcycle and lawn & garden applications.



Hitachi Powdered Metals (USA) is owned by Hitachi Powdered Metals Co., LTD of Japan, the largest powdered-metal company in Asia. As our parent company, Hitachi supports all North American operations with materials development, intricate tool design, and functional engine testing. This ensures Hitachi Powdered Metals (USA)'s  abilities to meet rigorous demands of the market.



Powdered Metallurgy

Powdered metallurgy was practiced long before ancient artisans learned to melt and cast iron.  The Egyptians made iron tools using P/M techniques from at least 3000 B.C.  The ancient Inca Indians also made jewelry and artifacts from precious metal powders.  The first modern P/M products was the tungsten filament for electric light bulbs developed in the early 1900's.  This was followed by tungsten carbide cutting tool material in the 1930's, automobile parts in the '60s and '70s, aircraft turbine engine parts in the '80s, and parts made by powder forging (P/F), metal injection molding (MIM) and warm compacting in the '90s.




Powder Metallurgy, or P/M, is a highly developed method of manufacturing reliable ferrous and nonferrous products.  Made by mixing elemental or alloy powders and compacting the mixture in a die, the resultant shapes are then sintered or heated in a controlled atmosphere furnace to bond the particles metallurgically.  Basically, a "chipless" metalworking process, P/M typically uses more than 97% of the starting raw material in the finished part.  Because of this, P/M is energy and materials conserving process.




The P/M process is cost effective in producing simple or complex parts at, or, very close to, final dimensions in production rates which can range from a few hundred to several thousand parts per hour.  As a result, only minor machining is required.  P/M parts also may be sized for closer dimensional control and / or coined for both higher density and strength.



Most P/M parts weigh less than 5 pounds (2.27kg), although parts weighing as much as 35 pounds (15.89kg) can be fabricated in conventional P/M equipment.  Many of the early P/M parts, such as bushings and bearings, were very simple shapes, as constrasted with the complex contours and multiple levels, which are often produced economically today.



Advantages of the P/M process;

  • Eliminates or minimizes machining

  • Eliminates or minimizes scrap loses

  • Maintains close dimensional tolerances

  • Permits a wide variety of alloy systems

  • Produces good surface finishes

  • Provides material which may be heat-treated for increased strength or increased wear resistance

  • Provides controlled porosity for self-lubrication or filtration

  • Facilitates the manufacturing of complex or unique shapes with other processes

  • Offers long-term performance reliability in critical applications

  • Cost effective


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