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  • news >> Industry news >> What is Investment Casting
  • What is Investment Casting
  • An investment casting is a near net shape part made by the "lost wax" process that features cast-in detail, tight tolerances, and excellent surface finish. The term "investment" refers to the ceramic materials that are used to build a hollow shell into which molten metal is poured to make the castings. Originally, a plaster type material was poured or "invested" into a container that held a clustered tree of small wax patterns, which were identical to the desired casting. After the plaster was set, the disposable patterns were melted out, leaving a hollow cavity into which the metal was poured. While some non-ferrous castings are still made this way, most investment castings are now made by the shell method

     

    Every casting requires a pattern that is made by injecting wax or plastic material into a steel or aluminum die. If the finished part is to have complex internal configurations, a soluble or ceramic core is inserted in the die at this stage. Once the wax has hardened, the machine operator opens the die and removes the pattern. The completed patterns are then wax welded on a cylindrical shape for further processing.

     

    Assembled patterns are dipped in a prime coat of agitated ceramic slurry and then coated with a stucco of fine sand to build a good surface finish. The process is repeated until a thickness of approximately 3/8" surrounds each part. Once the shell has dried, the wax is melted out in a pressurized steam autoclave or by flash firing at high temperatures1400 . The hollow shells are preheated to 800-2000, depending on the alloy to be cast and then immediately filled with molten metal.

    When the metal has cooled, operators remove the shell or investment material from the cast "tree," cut off the castings, and grind off any of the gate, which remains. Depending on your requirements, the parts may be shipped "as cast" or may be heat-treated, plated, or otherwise processed before shipment.

    When the metal has cooled, operators remove the shell or investment material from the cast "tree," cut off the castings, and grind off any of the gate, which remains. Depending on your requirements, the parts may be shipped "as cast" or may be heat-treated, plated, or otherwise processed before shipment.

     

    When the metal has cooled, operators remove the shell or investment material from the cast "tree," cut off the castings, and grind off any of the gate, which remains. Depending on your requirements, the parts may be shipped "as cast" or may be heat-treated, plated, or otherwise processed before shipment.

     

    When the metal has cooled, operators remove the shell or investment material from the cast "tree," cut off the castings, and grind off any of the gate, which remains. Depending on your requirements, the parts may be shipped "as cast" or may be heat-treated, plated, or otherwise processed before shipment.

     

    When the metal has cooled, operators remove the shell or investment material from the cast "tree," cut off the castings, and grind off any of the gate, which remains. Depending on your requirements, the parts may be shipped "as cast" or may be heat-treated, plated, or otherwise processed before shipment.

    oriens has been and continues to be a pioneer in investment casting technology. We strive to maintain our early technical leadership in the industry with a continuing investment in both research and development and state-of-the-art equipment.

     

     

     

     

     

     

     

     

     

     

     

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