US2011084430A1PendingUtilityA1

Contoured Molten Metal Filter Cups

33
Individually held — no corporate assignee on recordPriority: Mar 27, 2009Filed: Mar 29, 2010Published: Apr 14, 2011
Est. expiryMar 27, 2029(~2.7 yrs left)· nominal 20-yr term from priority
Inventors:Jay R. HitchingsJason Hitchings
B22C 9/086
33
PatentIndex Score
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Cited by
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References
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Claims

Abstract

Contoured molten metal filter cups having an interstitial flow space that is maintained between the inner-wall of a molten metal pouring cone, riser sleeve or mold and the outer wall of the filter cup are disclosed. The interstitial space provided by the contoured filter cups results in significantly increased molten metal throughput during casting operations, while simultaneously providing an increased level of filtering efficiency.

Claims

exact text as granted — not AI-modified
1 . A molten metal filter cup comprising:
 an upper wall section having an outer surface structured and arranged to contact an inner surface of a molten metal casting structure;   a generally conical lower wall section below the upper wall section structured and arranged to be spaced an offset distance from the inner surface of the molten metal casting structure when the outer surface of the upper wall section contacts the inner surface of the molten metal casting structure; and   a bottom below the lower wall section.   
     
     
         2 . The molten metal filter cup of  claim 1 , wherein the upper wall section is generally conical. 
     
     
         3 . The molten metal filter cup of  claim 2 , wherein the upper wall section and lower wall section are sloped at substantially the same angle measured from a vertical axial flow direction of the filter cup. 
     
     
         4 . The molten metal filter cup of  claim 3 , wherein the molten metal casting structure comprises a pouring cone, and the slope angle of the upper and lower wall sections is substantially the same as a slope angle of the pouring cone. 
     
     
         5 . The molten metal filter cup of  claim 1 , wherein the lower wall section is sloped at an angle of from about 1 to about 30 degrees measured from a vertical axial flow direction of the filter cup. 
     
     
         6 . The molten metal filter cup of  claim 1 , wherein the offset distance is from about 0.1 to about 0.4 inch. 
     
     
         7 . The molten metal filter cup of  claim 1 , wherein the offset distance is from about 0.12 to about 0.2 inch. 
     
     
         8 . The molten metal filter cup of  claim 1 , wherein the offset distance is substantially constant along a length of the lower wall section. 
     
     
         9 . The molten metal filter cup of  claim 1 , wherein the upper and lower wall sections are connected by a transition that extends radially inwardly at a lowermost portion of the upper wall. 
     
     
         10 . The molten metal filter cup of  claim 9 , wherein the transition connecting the upper and lower wall sections extend radially outwardly at an uppermost portion of the lower wall section. 
     
     
         11 . The molten metal filter cup of  claim 10 , wherein the transition connecting the upper and lower wall sections has an outer surface comprising a convex portion where the transition connects to the upper wall section, and a concave portion where the transition connects to the lower wall section. 
     
     
         12 . The molten metal filter cup of  claim 1 , further comprising a generally annular upper rim connected to the upper wall section. 
     
     
         13 . The molten metal filter cup of  claim 1 , wherein the lower wall section has a height measured in a vertical axial flow direction of the filter cup that is at least about 50 percent of an overall height of the filter cup. 
     
     
         14 . The molten metal filter cup of  claim 13 , wherein the height of the lower wall section is at least about 75 percent of the overall height of the filter cup. 
     
     
         15 . The molten metal filter cup of  claim 13 , wherein the upper wall section has a height that is less than about 25 percent of the overall height of the filter cup. 
     
     
         16 . The molten metal filter cup of  claim 1 , wherein the lower wall section has an uppermost portion having a cross-sectional outer diameter, and the upper wall section has a lowermost portion having a cross-sectional outer diameter that is at least about 5 percent larger than the cross-sectional outer diameter of the lower wall section. 
     
     
         17 . The molten metal filter cup of  claim 1 , wherein the lower wall section and the bottom are connected by a transition having a convex outer surface. 
     
     
         18 . The molten metal filter cup of  claim 1 , wherein the bottom is generally hemispherical. 
     
     
         19 . The molten metal filter cup of  claim 1 , wherein the bottom is substantially flat. 
     
     
         20 . A molten metal filter cup comprising:
 a generally conical upper wall section;   a lower wall section;   a transition between the upper and lower wall sections that extends radially inwardly from a lowermost portion of the upper wall section toward an uppermost portion of the lower wall section; and   a bottom below the lower wall section.   
     
     
         21 . The molten metal filter cup of  claim 20 , wherein the transition has an outer surface comprising a convex portion where it connects to the upper wall section and a concave portion where it connects to the lower wall section. 
     
     
         22 . The molten metal filter cup of  claim 20 , wherein the transition extends radially inwardly a distance of at least about 5 percent of a cross-sectional outer diameter of the lowermost portion of the upper wall section. 
     
     
         23 . The molten metal filter cup of  claim 22 , wherein the radial extension distance is at least about 0.1 inch. 
     
     
         24 . The molten metal filter cup of  claim 22 , wherein the radial extension distance is from about 0.12 to about 0.2 inch. 
     
     
         25 . The molten metal filter cup of  claim 20 , wherein the lower wall section is generally conical. 
     
     
         26 . A molten metal filter cup comprising:
 a generally conical upper wall section;   a generally conical lower wall section; and   a transition between the upper and lower wall sections that extends radially inwardly from a lowermost portion of the upper wall section toward an uppermost portion of the lower wall section.

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