Castings (precision casting, die casting, gravity casting)


Precision casting: a technology that includes uses of die-injected-molded wax patterns as the base to create the casting mold. Also known as a lost-wax casting.
Compared with conventional sand mold casting, precision casting can manufacture casts with excellent dimensional accuracy and very smooth external and internal surfaces.

Die casting: this method generally uses a molten aluminum alloy, which is cast under pressure into a die.

Gravity casting: this method generally uses a molten aluminum alloy, which is cast into a die under its own weight.


Our Kanagawa Branch can handle a wide variety of customer needs. It deals primarily with precision castings but also has a large range of die-cast aluminum products, gravity-cast aluminum products, and even some forgings.
Also, in keeping with our customer needs, we maintain an array of procurement sources from overseas manufacturers (in China and Southeast Asia) and Japanese manufacturers. Once procured, our system can finish products with machining and heat treatments to meet your cost and quality specifications.


  • Precision castings (lost-wax castings)

    - Carbon steels, stainless steels, vacuum alloys
    - Automotive parts (EGR parts, turbo parts, diesel engine parts, etc.)
    - Agricultural machinery and equipment, general industrial parts, etc.

  • Diecast products

    - All aluminum alloys used for die casting
    - Automotive parts, etc.

  • Gravity products

    - All aluminum alloys used for casting
    - Automotive intercooler parts, exhaust system parts, etc.


What materials are best suited for precision castings?
Generally, precision casting can handle nearly all metal materials. However, we cannot handle copper materials in some circumstances because they require extremely stringent controls.
Please briefly outline the advantages and disadvantages of each casting process.

1. Precision casting (lost-wax casting)
While the costs for dies are comparatively low, the process is relatively long.

2. Aluminum die casting
Because the aluminum is directly formed in the die, the dimensional accuracy is high and the process is short. Therefore, this is the best process for mass production. However, the initial costs tend to be relatively high to prepare a die which withstands the applied pressure in the process.

3. Gravity casting
This process casts the aluminum directly in the die under its own weight. Therefore the process is short and well suited for mass production. The initial costs for the dies and other setups are also lower compared to die casting. However, the casted surface is not as smooth and dimensional accuracy is not as high.

Casting (lost-wax process)

Casting (lost-wax process)

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