Investment casting pins
First Claim
1. An apparatus comprising:
- an investment casting pin including;
an elongated core formed of a metal which is susceptible to oxidation at a temperature associated with firing of a ceramic investment casting mold;
an outer coating which completely encases the elongated core and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature; and
an intermediate coating which is disposed between the core and the outer coating and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature.
3 Assignments
0 Petitions
Accused Products
Abstract
A pin used in investment casting, or the lost wax process, to support the ceramic core of a mold includes a core formed of a metal which provides suitable strength to maintain the position of the ceramic core during pouring of molten metal into the mold but which is susceptible to oxidation during firing of the mold. The pin core is encased with an outer coating formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. An intermediate coating is preferably disposed between the core and outer coating and is likewise formed of a metal which resists oxidation during firing of the mold and resists chemical interaction during processing of the cast part. The invention also includes an investment casting mold using a plurality of these pins and methods of making the pin and the mold.
50 Citations
24 Claims
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1. An apparatus comprising:
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an investment casting pin including; an elongated core formed of a metal which is susceptible to oxidation at a temperature associated with firing of a ceramic investment casting mold; an outer coating which completely encases the elongated core and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature; and an intermediate coating which is disposed between the core and the outer coating and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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an investment casting pin including; an elongated core formed of a metal which is susceptible to oxidation at a temperature associated with firing of a ceramic investment casting mold; an outer coating which completely encases the elongated core and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature; and a ceramic shell and a ceramic core; and
wherein a plurality of the pins extend from the ceramic shell to the ceramic core whereby the pins support the ceramic core within the ceramic shell. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus comprising:
an investment casting pin including; an elongated core formed of a metal which is susceptible to oxidation at a temperature associated with firing of a ceramic investment casting mold; an outer coating which is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature; an intermediate coating which is disposed between the core and the outer coating and is formed of a metal capable of resisting chemical interaction with ceramic materials and oxidation at said temperature; and wherein one of the outer coating, the intermediate coating and a combination of the outer and intermediate coatings completely encases the elongated core. - View Dependent Claims (24)
Specification