US20110084430A1 - Contoured Molten Metal Filter Cups - Google Patents
Contoured Molten Metal Filter Cups Download PDFInfo
- Publication number
- US20110084430A1 US20110084430A1 US12/749,144 US74914410A US2011084430A1 US 20110084430 A1 US20110084430 A1 US 20110084430A1 US 74914410 A US74914410 A US 74914410A US 2011084430 A1 US2011084430 A1 US 2011084430A1
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- Prior art keywords
- wall section
- molten metal
- filter cup
- lower wall
- metal filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
Definitions
- the present invention relates to filters for molten metal, and more particularly to contoured molten metal filter cups.
- Investment casting foundries utilize pouring cones as a core components of an investment casting tree, while other metalcasting foundries employ a wide variety of mold designs that include green sand, no-bake, permanent mold, and other materials in both horizontal and vertically-parted configurations.
- metalcasting foundries currently use different kinds of molten metal filter media, including ceramic foam filters, ceramic cellular filters, extruded lattice filters, and both fiberglass and silica mesh filter cups.
- Molten metal filter cups produced from fiberglass, silica mesh or other materials have usually been designed to fit tightly against or conform as close as possible to the inner walls of the molten metal casting structures in which they are placed, such as investment casting ceramic pour cones, runner sections within a mold, and riser sleeves. The rationale behind this technique is to ensure that the cup remains stable during pouring of the molten metal. Examples of silica mesh filter cups are described in U.S. Application Publication No. 2008/0173591, which is incorporated herein by reference.
- the primary purpose of using filter cups within metal casting structures is to filter out the slag and dross
- another important performance characteristic of metalcasting operations is the molten metal flow rate through the filter cups, typically referred to as “throughput”.
- throughput the throughput of molten metal poured through filter cups or other filter media is increased or decreased by varying the size of the fabric mesh holes of the filter cups, with a larger mesh size (larger holes) providing higher throughput, and a smaller mesh size providing lower throughput.
- Users of ceramic filters would increase or decrease the pore size of their filter material to manipulate the throughput rate in the same manner.
- the tradeoff for increased throughput comes at the cost of a potential reduction in filtering efficiency. While larger meshes or pore sizes permit more metal to flow through at faster rates, they also allow additional slag and dross to pass as well.
- the present invention provides contoured molten metal filter cups having an interstitial flow space that is maintained between the inner-wall of a metalcasting structure such as a ceramic pouring cone, mold pattern, riser sleeve and the like, and the outer-wall of the filter cup.
- metal casting structures also include the contact area within or used as part of any variety of metalcasting mold patterns such as green sand, no-bake, permanent mold, horizontal and vertically parted molds, and automated pouring systems such as DISAMATIC, Hunter machines, and high and low pressure die-casting machines.
- 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.
- An aspect of the present invention is to provide 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.
- Another aspect of the present invention is to provide 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.
- a further aspect of the present invention is to provide 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.
- FIG. 1 is a side sectional view of a contoured molten metal filter cup installed in a pouring cone in accordance with an embodiment of the invention.
- FIG. 2 is a side sectional view showing dimensions of the filter cup of FIG. 1 .
- FIG. 3 is a side sectional view of a contoured molten metal filter cup in accordance with another embodiment of the invention.
- contoured molten metal filter cups with an interstitial flow space between the filter cups and pouring cones or other metalcasting structures in which they are installed mitigate the tradeoff of throughput for filter efficiency by providing a geometry that maintains a set level of filtration efficiency while at the same time increasing the molten metal throughput of the pouring cone/filter cup unit.
- the interstitial flow space significantly increases the filtration area of the filter cups and increases overall filtration efficiency.
- the filter cups may be installed in a pouring cone or placed elsewhere within a mold pattern, such as the downsprue of an automated casting machine, e.g., a DISAMATIC, or within riser sleeves.
- the filter cups may be made from any known material, including silica or fiberglass mesh fabrics as well as ceramic material as is common with ceramic foam, ceramic cellular, and extruded lattice filters.
- one type of filter cup material for use in accordance with an embodiment of the present invention comprises silica mesh fabric with a refractory coating as disclosed in U.S. Application Publication No. 2008/0173591.
- FIG. 1 illustrates a contoured molten metal filter cup 10 installed in a ceramic pouring cone 20 .
- the filter cup 10 includes an upper rim 11 , a conical upper wall section 12 , a conical, inwardly offset lower wall section 14 , and a bottom 16 .
- the filter cup 10 includes a transition 13 between the upper wall section 12 and the lower wall section 14 , and another transition 15 between the lower wall section 14 and the bottom 16 .
- the conical upper wall section 12 , conical lower wall section 14 and conical pouring cone 20 are sloped at substantially the same angle measured from a vertical axial flow direction of the filter cup 10 .
- the filter cup 10 has an interstitial flow space 18 representing the volume between the inner surface of the pouring cone 20 and the outer surface of the lower wall section 14 . While the upper wall section 12 of the filter cup 10 contacts the inner surface of the pouring cone 20 , the lower wall section 14 is located radially inwardly of the pouring cone 20 to provide the interstitial flow space 18 .
- FIG. 2 illustrates several dimensions of the filter cup 10 .
- the upper rim 11 has an outer diameter OD R and an inner diameter ID R .
- the upper wall section 12 has an outer diameter OD U measured at the lowermost portion of the upper wall section, and a height H U .
- the lower wall section 14 has an outer diameter OD L measured at its uppermost portion, and a height H L .
- the lower wall section 14 has an offset distance D representing the distance between the outer surface of the lower wall section 14 and the inner surface of the pouring cone 20 .
- the conical lower wall section 14 is sloped at an angle A measured from a vertical axial flow direction of the filter cup 10 .
- the bottom 16 has an outer diameter OD B measured at the transition 15 between the lower wall section 14 and the bottom 16 .
- the filter cup 10 has a thickness T.
- the dimensions of the filter cup 10 shown in FIG. 2 may be selected depending upon the particular geometry of the pouring cone or other metal casting structure.
- the outer diameter OD R of the upper rim 11 may typically be from about 4 to about 7 inches, e.g., about 5.5 inches.
- the inner diameter ID R of the upper rim 11 may typically be from about 2.5 to about 6 inches, e.g., about 3.25 inches.
- the outer diameter OD U of the upper wall section 12 may be typically from about 2 to about 5 inches, e.g., about 3 inches.
- the outer diameter OD L of the lower wall section 14 may typically be from about 2.2 to about 5.5 inches, e.g., about 3 inches.
- the height H U of the upper wall section 12 may typically be from about 0.2 to 1 inch, e.g., about 0.4 inch.
- the height H L of the lower wall section 14 may typically be from about 0.5 to about 4 inches, e.g., about 2 inches.
- the offset distance D of the lower wall section 14 may typically be from about 0.1 to about 0.5 inch, e.g., about 0.13 inch.
- the cone slope angle A of the lower wall section 14 may typically be from about 1 to about 30 degrees, more typically from about 5 to about 20 degrees, e.g., about 15 degrees.
- the slope angles of the upper wall section 12 and pouring cone 20 may be the same as, or different from, the slope angle A of the lower wall section 14 .
- the diameter OD B of the bottom 16 may typically be from about 1 to about 3 inches, e.g., about 1.5 or 1.6 inches.
- the thickness T of the filter cup 10 may be typically from about 0.01 to about 0.1 or 0.2 inch, e.g., about 0.04 inch.
- the rim 11 and the upper wall section 12 contact and remain flush against the contour and angle of the inner wall of the ceramic pouring cone 20 to provide a cup weight-bearing area. They continue down to the point where the two are separated from each other at the transition 13 .
- the cavity or space 18 created between the lower wall 14 of the filter cup 10 and the inner surface of the pouring cone 20 provides the interstitial flow space 18 , which starts at the end of the cup weight-bearing area (point of separation) and continues downward along the outer surface of the lower wall section 14 , following the sloping contour of the pouring cone 20 and ends at the transition 15 at the hemispherical or flat bottom 16 of the filter cup 10 .
- FIG. 3 illustrates a filter cup 110 in accordance with another embodiment of the present invention, with like reference numerals designating similar elements in both FIGS. 2 and 3 .
- the filter cup 110 shown in FIG. 3 may have an outer rim diameter OD R of about 5.5 inches, an inner rim diameter ID R of about 4 inches, an outer diameter OD U of the upper wall section 12 of about 3.5 to 3.7 inches, an outer diameter OD L of the lower wall section 14 of about 3.3 to 3.5 inches, an upper wall section height H U of about 0.4 inch, and a lower wall section height H L of about 1.4 inches.
- the diameter OD B of the bottom 16 may be about 2.7 or 2.8 inches.
- the filter cup thickness T and offset distance D of the interstitial flow space 18 in the embodiment shown in FIG. 3 may be similar to those of the embodiment of FIG. 2 .
- the casting test results confirm an average increase in measured molten metal throughput of at least 20 or 25 percent.
- the effective filtration area in the cup may be increased by over 50 percent, typically over 75 percent, as the molten metal is able to flow through the side walls and into the interstitial flow space, instead of being force-focused at the very bottom of the filter cup as in conventional designs.
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.
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/164,150 filed Mar. 27, 2009, which is incorporated herein by reference.
- The present invention relates to filters for molten metal, and more particularly to contoured molten metal filter cups.
- Investment casting foundries utilize pouring cones as a core components of an investment casting tree, while other metalcasting foundries employ a wide variety of mold designs that include green sand, no-bake, permanent mold, and other materials in both horizontal and vertically-parted configurations. In various metalcasting techniques, there are advantages to filtering out slag and dross that form in the molten metal during pouring. Metalcasting foundries currently use different kinds of molten metal filter media, including ceramic foam filters, ceramic cellular filters, extruded lattice filters, and both fiberglass and silica mesh filter cups.
- Molten metal filter cups produced from fiberglass, silica mesh or other materials have usually been designed to fit tightly against or conform as close as possible to the inner walls of the molten metal casting structures in which they are placed, such as investment casting ceramic pour cones, runner sections within a mold, and riser sleeves. The rationale behind this technique is to ensure that the cup remains stable during pouring of the molten metal. Examples of silica mesh filter cups are described in U.S. Application Publication No. 2008/0173591, which is incorporated herein by reference.
- While the primary purpose of using filter cups within metal casting structures is to filter out the slag and dross, another important performance characteristic of metalcasting operations is the molten metal flow rate through the filter cups, typically referred to as “throughput”. Conventionally, the throughput of molten metal poured through filter cups or other filter media is increased or decreased by varying the size of the fabric mesh holes of the filter cups, with a larger mesh size (larger holes) providing higher throughput, and a smaller mesh size providing lower throughput. Users of ceramic filters would increase or decrease the pore size of their filter material to manipulate the throughput rate in the same manner. Unfortunately, the tradeoff for increased throughput comes at the cost of a potential reduction in filtering efficiency. While larger meshes or pore sizes permit more metal to flow through at faster rates, they also allow additional slag and dross to pass as well.
- The present invention provides contoured molten metal filter cups having an interstitial flow space that is maintained between the inner-wall of a metalcasting structure such as a ceramic pouring cone, mold pattern, riser sleeve and the like, and the outer-wall of the filter cup. Examples of metal casting structures also include the contact area within or used as part of any variety of metalcasting mold patterns such as green sand, no-bake, permanent mold, horizontal and vertically parted molds, and automated pouring systems such as DISAMATIC, Hunter machines, and high and low pressure die-casting machines. 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.
- An aspect of the present invention is to provide 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.
- Another aspect of the present invention is to provide 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.
- A further aspect of the present invention is to provide 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.
- These and other aspects of the present invention will be more apparent from the following description.
-
FIG. 1 is a side sectional view of a contoured molten metal filter cup installed in a pouring cone in accordance with an embodiment of the invention. -
FIG. 2 is a side sectional view showing dimensions of the filter cup ofFIG. 1 . -
FIG. 3 is a side sectional view of a contoured molten metal filter cup in accordance with another embodiment of the invention. - In accordance with the present invention, contoured molten metal filter cups with an interstitial flow space between the filter cups and pouring cones or other metalcasting structures in which they are installed mitigate the tradeoff of throughput for filter efficiency by providing a geometry that maintains a set level of filtration efficiency while at the same time increasing the molten metal throughput of the pouring cone/filter cup unit. The interstitial flow space significantly increases the filtration area of the filter cups and increases overall filtration efficiency. The filter cups may be installed in a pouring cone or placed elsewhere within a mold pattern, such as the downsprue of an automated casting machine, e.g., a DISAMATIC, or within riser sleeves. The filter cups may be made from any known material, including silica or fiberglass mesh fabrics as well as ceramic material as is common with ceramic foam, ceramic cellular, and extruded lattice filters. For example, one type of filter cup material for use in accordance with an embodiment of the present invention comprises silica mesh fabric with a refractory coating as disclosed in U.S. Application Publication No. 2008/0173591.
-
FIG. 1 illustrates a contoured moltenmetal filter cup 10 installed in aceramic pouring cone 20. Although aceramic pouring cone 20 is shown inFIG. 1 , it is to be understood that the filter cups of the present invention may be installed in various other types of molten metal casting structures. Thefilter cup 10 includes anupper rim 11, a conicalupper wall section 12, a conical, inwardly offsetlower wall section 14, and abottom 16. Thefilter cup 10 includes atransition 13 between theupper wall section 12 and thelower wall section 14, and anothertransition 15 between thelower wall section 14 and thebottom 16. In the embodiment shown inFIG. 1 , the conicalupper wall section 12, conicallower wall section 14 andconical pouring cone 20 are sloped at substantially the same angle measured from a vertical axial flow direction of thefilter cup 10. - In accordance with the present invention, the
filter cup 10 has aninterstitial flow space 18 representing the volume between the inner surface of thepouring cone 20 and the outer surface of thelower wall section 14. While theupper wall section 12 of thefilter cup 10 contacts the inner surface of thepouring cone 20, thelower wall section 14 is located radially inwardly of thepouring cone 20 to provide theinterstitial flow space 18. -
FIG. 2 illustrates several dimensions of thefilter cup 10. Theupper rim 11 has an outer diameter ODR and an inner diameter IDR. Theupper wall section 12 has an outer diameter ODU measured at the lowermost portion of the upper wall section, and a height HU. Thelower wall section 14 has an outer diameter ODL measured at its uppermost portion, and a height HL. Thelower wall section 14 has an offset distance D representing the distance between the outer surface of thelower wall section 14 and the inner surface of thepouring cone 20. The conicallower wall section 14 is sloped at an angle A measured from a vertical axial flow direction of thefilter cup 10. Thebottom 16 has an outer diameter ODB measured at thetransition 15 between thelower wall section 14 and thebottom 16. Thefilter cup 10 has a thickness T. - The dimensions of the
filter cup 10 shown inFIG. 2 may be selected depending upon the particular geometry of the pouring cone or other metal casting structure. For example, the outer diameter ODR of theupper rim 11 may typically be from about 4 to about 7 inches, e.g., about 5.5 inches. The inner diameter IDR of theupper rim 11 may typically be from about 2.5 to about 6 inches, e.g., about 3.25 inches. The outer diameter ODU of theupper wall section 12 may be typically from about 2 to about 5 inches, e.g., about 3 inches. The outer diameter ODL of thelower wall section 14 may typically be from about 2.2 to about 5.5 inches, e.g., about 3 inches. The height HU of theupper wall section 12 may typically be from about 0.2 to 1 inch, e.g., about 0.4 inch. The height HL of thelower wall section 14 may typically be from about 0.5 to about 4 inches, e.g., about 2 inches. The offset distance D of thelower wall section 14 may typically be from about 0.1 to about 0.5 inch, e.g., about 0.13 inch. The cone slope angle A of thelower wall section 14 may typically be from about 1 to about 30 degrees, more typically from about 5 to about 20 degrees, e.g., about 15 degrees. The slope angles of theupper wall section 12 and pouringcone 20 may be the same as, or different from, the slope angle A of thelower wall section 14. The diameter ODB of thebottom 16 may typically be from about 1 to about 3 inches, e.g., about 1.5 or 1.6 inches. The thickness T of thefilter cup 10 may be typically from about 0.01 to about 0.1 or 0.2 inch, e.g., about 0.04 inch. Although specific dimensional ranges are given above, it is to be understood that the various dimensions may be adjusted as desired, depending upon the particular casting operation and pouring cone or other metal casting structure geometry. - At the top of the
pouring cone 20 andfilter cup 10, therim 11 and theupper wall section 12 contact and remain flush against the contour and angle of the inner wall of the ceramic pouringcone 20 to provide a cup weight-bearing area. They continue down to the point where the two are separated from each other at thetransition 13. The cavity orspace 18 created between thelower wall 14 of thefilter cup 10 and the inner surface of thepouring cone 20 provides theinterstitial flow space 18, which starts at the end of the cup weight-bearing area (point of separation) and continues downward along the outer surface of thelower wall section 14, following the sloping contour of thepouring cone 20 and ends at thetransition 15 at the hemispherical orflat bottom 16 of thefilter cup 10. -
FIG. 3 illustrates afilter cup 110 in accordance with another embodiment of the present invention, with like reference numerals designating similar elements in bothFIGS. 2 and 3 . In a particular embodiment, thefilter cup 110 shown inFIG. 3 may have an outer rim diameter ODR of about 5.5 inches, an inner rim diameter IDR of about 4 inches, an outer diameter ODU of theupper wall section 12 of about 3.5 to 3.7 inches, an outer diameter ODL of thelower wall section 14 of about 3.3 to 3.5 inches, an upper wall section height HU of about 0.4 inch, and a lower wall section height HL of about 1.4 inches. The diameter ODB of the bottom 16 may be about 2.7 or 2.8 inches. The filter cup thickness T and offset distance D of theinterstitial flow space 18 in the embodiment shown inFIG. 3 may be similar to those of the embodiment ofFIG. 2 . - To confirm the improved throughput of the present filters, tests were conducted using standard investment casting techniques to cast a stainless steel alloy (nickel chrominum Stainless Steel Alloy 625) in multiple runs of 75 pounds each. The same testing parameters and number of iterations were run and data recorded using a conventional filter cup design with no interstitial flow space in comparison with the contoured filter cup design shown in
FIG. 2 . The average pour time for the conventional filter was 8 seconds, in comparison with an average pour time of 6 seconds for the filter cup design of the present invention. An average throughput increase of 25 percent was thus achieved with the contoured filter cup of the present invention. - The casting test results confirm an average increase in measured molten metal throughput of at least 20 or 25 percent. Further, the effective filtration area in the cup may be increased by over 50 percent, typically over 75 percent, as the molten metal is able to flow through the side walls and into the interstitial flow space, instead of being force-focused at the very bottom of the filter cup as in conventional designs.
- Whereas particular embodiments of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing from the invention as defined in the appended claims.
Claims (26)
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.
Priority Applications (1)
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US12/749,144 US20110084430A1 (en) | 2009-03-27 | 2010-03-29 | Contoured Molten Metal Filter Cups |
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US16415009P | 2009-03-27 | 2009-03-27 | |
US12/749,144 US20110084430A1 (en) | 2009-03-27 | 2010-03-29 | Contoured Molten Metal Filter Cups |
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US20110084430A1 true US20110084430A1 (en) | 2011-04-14 |
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US12/749,144 Abandoned US20110084430A1 (en) | 2009-03-27 | 2010-03-29 | Contoured Molten Metal Filter Cups |
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Cited By (5)
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CN102839246A (en) * | 2012-08-30 | 2012-12-26 | 江苏永钢集团有限公司 | Water-cooled slag discharging runner head |
CN102839247A (en) * | 2012-09-27 | 2012-12-26 | 鞍钢股份有限公司 | Method for improving service life of iron-storage main iron runner |
US9315426B2 (en) | 2010-05-20 | 2016-04-19 | Comanche Tecnologies, LLC | Coatings for refractory substrates |
WO2017039423A3 (en) * | 2015-09-06 | 2017-04-27 | 이성재 | Capsule device |
CN107052252A (en) * | 2016-12-31 | 2017-08-18 | 邓锦志 | It is incubated casting molds rising head |
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US4092153A (en) * | 1977-07-29 | 1978-05-30 | Swiss Aluminium Limited | Filtering and inline degassing of molten metal |
US4708326A (en) * | 1986-12-15 | 1987-11-24 | Swiss Aluminium Ltd. | Vented pouring cup for molten metal casting |
US4721567A (en) * | 1984-06-06 | 1988-01-26 | Certech Inc. | Ceramic pouring filter with tortuous flow paths |
US4789140A (en) * | 1982-06-11 | 1988-12-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US20080173591A1 (en) * | 2006-11-09 | 2008-07-24 | Hitchings Jay R | Refractory Coating for silica mesh fabric |
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- 2010-03-29 US US12/749,144 patent/US20110084430A1/en not_active Abandoned
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US4092153A (en) * | 1977-07-29 | 1978-05-30 | Swiss Aluminium Limited | Filtering and inline degassing of molten metal |
US4789140A (en) * | 1982-06-11 | 1988-12-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US4721567A (en) * | 1984-06-06 | 1988-01-26 | Certech Inc. | Ceramic pouring filter with tortuous flow paths |
US4708326A (en) * | 1986-12-15 | 1987-11-24 | Swiss Aluminium Ltd. | Vented pouring cup for molten metal casting |
US20080173591A1 (en) * | 2006-11-09 | 2008-07-24 | Hitchings Jay R | Refractory Coating for silica mesh fabric |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9315426B2 (en) | 2010-05-20 | 2016-04-19 | Comanche Tecnologies, LLC | Coatings for refractory substrates |
CN102839246A (en) * | 2012-08-30 | 2012-12-26 | 江苏永钢集团有限公司 | Water-cooled slag discharging runner head |
CN102839247A (en) * | 2012-09-27 | 2012-12-26 | 鞍钢股份有限公司 | Method for improving service life of iron-storage main iron runner |
WO2017039423A3 (en) * | 2015-09-06 | 2017-04-27 | 이성재 | Capsule device |
CN107052252A (en) * | 2016-12-31 | 2017-08-18 | 邓锦志 | It is incubated casting molds rising head |
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