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US 12,220,742 B2Granted
Apparatus method for locating, controlling geometry, and managing stress of hot tops for metal casting
AssigneePyrotek, Inc.
InventorJonathan Klesch
Life of this patent
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Abstract
A method and apparatus used to achieve alignment during mold assembly and accommodate thermal expansion comprising employing a compressible region and a modified interface dimension.
Claims18
A hot top mold assembly system, comprising:
- a hot top and a mold, said hot top including a dimension creating a locational clearance fit between the hot top and the mold, the hot top including a collar configured to mate with an end of the mold and a depending edge configured to interface with an internal wall of the mold, wherein the edge includes a deformable feature to improve alignment during assembly of the hot top with the mold and accommodate thermal expansion, wherein the locational clearance fit of the hot top dimension at ambient temperature (SO) is expressed as:
- M
- O
- ≤
- S
- O
- ≤
- I
- O
- 1
- +
- 0.833
- αΔ
-
- T
- wherein MO is a mold dimension at ambient temperature;
- IO is a mold interface dimension at ambient temperature;
- α is a coefficient of thermal expansion of bulk hot top material;
- and ΔT is temperature change between ambient temperature and casting temperature.
16 more elements
A hot top for use in a hot top mold assembly system, the hot top comprising:
- a hot top configured to create a locational clearance fit between the hot top and a mold, the hot top including a annular wall configured to penetrate an opening of the mold assembly, a collar extending radially from an intersection with the annular wall, the collar configured to engage an end surface of the opening of the mold, wherein the annular wall further comprises a feature to restrain or locate a compressible component of the hot top, wherein the locational clearance fit of the hot top dimension at ambient temperature (SO) is expressed as:
- M
- O
- ≤
- S
- O
- ≤
- I
- O
- 1
- +
- 0
- .
- 8
-
- 3
-
- 3
-
- α
-
- Δ
-
- T
- wherein MO is a mold dimension at ambient temperature;
- IO is a mold interface dimension at ambient temperature;
- α is a coefficient of thermal expansion of bulk hot top material;
- and ΔT is temperature change between ambient temperature and casting temperature.
25 more elements
A method to reduce thermal stress of a hot top comprising providing a locational clearance fit between the hot top and a mold, wherein the locational clearance fit of the hot top dimension at ambient temperature (So) is expressed as:
- M
- O
- ≤
- S
- O
- ≤
- I
- O
- 1
- +
- 0
- .
- 8
-
- 33
-
- αΔ
-
- T
- wherein MO is a mold dimension at ambient temperature;
- IO is a mold interface dimension at ambient temperature;
- α is a coefficient of thermal expansion of bulk hot top material;
- and
- ΔT is temperature change between ambient temperature and casting temperature.
21 more elements
Dependencies are inferred from the claim text.