US20140060769A1 - Mold having ceramic insert - Google Patents
Mold having ceramic insert Download PDFInfo
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- US20140060769A1 US20140060769A1 US13/599,236 US201213599236A US2014060769A1 US 20140060769 A1 US20140060769 A1 US 20140060769A1 US 201213599236 A US201213599236 A US 201213599236A US 2014060769 A1 US2014060769 A1 US 2014060769A1
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- Prior art keywords
- mold
- ceramic insert
- cavity
- ceramic
- opening
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- 239000000919 ceramic Substances 0.000 title claims abstract description 73
- 229910052751 metal Inorganic materials 0.000 claims description 49
- 239000002184 metal Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 229910001018 Cast iron Inorganic materials 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 238000000465 moulding Methods 0.000 description 7
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 4
- 229910001092 metal group alloy Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- SZMZREIADCOWQA-UHFFFAOYSA-N chromium cobalt nickel Chemical compound [Cr].[Co].[Ni] SZMZREIADCOWQA-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/066—Manufacturing, repairing or reinforcing ingot moulds
- B22D7/068—Manufacturing, repairing or reinforcing ingot moulds characterised by the materials used therefor
Definitions
- the invention relates to molds used for metal casting such as cast iron molds into which hot metal is poured and allowed to cool to form an ingot or electrode.
- metal alloys are made by mixing raw metals in selected proportions in a furnace and heating the mixture at a desired temperature for a selected time to melt the metals.
- the molten metal is taken from the furnace in ladles.
- Other additives may be added to the molten metal while the melt is in the ladle.
- the metal is poured from the ladle into molds.
- These molds are often made of cast iron or another metal having a higher melting point than the metal being melted. Those temperatures are often in the range of 2750° F. to 2800° F. (1510° C. to 1538° C.).
- the molten metal solidifies in the mold to form an ingot, electrode or other metal product.
- the metal product is removed from the mold for further processing.
- the mold is cleaned and then reused to form other metal products.
- Electrodes for arc welding and electric arc furnaces are commonly made by pouring molten metal into a cast iron tubular body that sits on a flat base. The molten metal solidifies inside that tubular body forming an electrode and then the tubular body is lifted off the base. Sometimes the electrode remains on the base when the tubular body is removed. At other times the electrode stays within the tubular body and must be removed from that body.
- Molds having cavities much smaller than the cavity in an electrode mold or ingot mold are used for making molded plastic products and for casting metal parts.
- plastic molding industry there are two basic types of molds.
- One type of mold is created by removing material from mating mold plates such that when the two mold plates are put together the corresponding cavities in the mold plates define a single cavity that has the shape of the product to be molded.
- the mold plates are made from wear-resistant metal alloys, conventional machining of these plates is extremely difficult, expensive, time consuming, and is also limited to machining simple mold cavity geometries.
- the second type of mold known as an insert mold
- Metal inserts are placed into the space machined into the mold plates or mold body.
- the inserts have cavities which together define the shape of the part to be molded. Inserts allow the use of lower cost and easier to machine metals for the mold plates and limit the use of wear-resistant metal alloys to the metal inserts.
- this approach requires expensive and time consuming metal removal methods to create the cavity shape within the metal insert.
- U.S. Pat. No. 4,704,079 to Pluim Jr discloses a multi-part mold for injection molding of plastic parts. This mold is made up of at least two parts. There is a mold block portion having a ceramic mold cavity insert. The ceramic mold cavity inserts define the walls of the mold cavity when the mold is closed. Each mold cavity insert comprises a shaped ceramic body having a mounting surface adapted to fit under compressive stress throughout the entire molding operation within a mounting cavity of the mold block portion.
- Injection molding is extremely hard on molds. Although some ceramic inserts last longer than others, they all suffer eventually because of distortion, erosion of the mold cavity surface, heat checking from thermal shock, and for other reasons.
- a ceramic insert In order for a ceramic insert to be utilized in a mold cavity for high pressure molding, it is necessary to secure it in a mounting cavity in the mold block or mold body portion in such a way as to maintain it in a state of compressive stress throughout the molding or casting cycle. This will provide a tight fit of the insert in the mold block despite differences in the thermal expansion and thereby provide efficient transfer of impact energy and thermal energy to the mold block. Consequently, the space that receives the ceramic insert, as well as the insert itself must be specially configured to fit together in a way that provides a tight fit.
- U.S. Pat. No. 7,302,989 Kamel, et al. discloses a mold system that may include a method of producing a ceramic core usable in production of a turbine airfoil.
- the method may include building a mold plate having at least one mold cavity configured to receive an insert and installing an insert in that cavity. Installing the insert in the cavity preferably includes installing a ceramic insert fully or partially formed from silicon carbide.
- the insert may include a coating formed from a chemical vapor deposition of a nonporous material, which may be silicon carbide.
- the ceramic insert may be formed from a net shape process.
- the mold plate may be formed with soft steels, such as P20 or NAK55, aluminum, aluminum-epoxy, and other appropriate materials. Materials such as abrasive resistant steels are not preferred because such materials are difficult to machine and require EDM processes.
- the amount of material that enters the mold cavity is usually a small fraction of the amount of molten metal that is poured in an electrode mold or ingot mold and those molds operate at much lower temperatures. Consequently, the use of ceramic inserts in molds for injection molding of plastics has not been considered as being transferrable to molds used in steel making.
- I provide a mold useful for casting electrodes or other metal parts which has a body having an open top, a bottom with an opening, and a longitudinal cavity passing through the body.
- the cavity defined by a cavity wall extending from the top to the bottom of the body.
- a ceramic insert having sidewalls is positioned within the cavity such that the sidewalls are in the recess in the cavity wall.
- the body of the ingot mold preferably is cast iron.
- the ceramic insert preferably is made of a high alumina ceramic.
- the ceramic insert fits within the recess in the cavity wall and is held in place with a bonding material.
- Molten metal is poured into the top of the mold to substantially fill the cavity.
- the molten metal cools within the cavity to form an electrode.
- the electrode and the ceramic insert are removed from the mold. During the removal the ceramic insert is attached to one end of the electrode. After removal of the electrode from the mold the ceramic insert is removed from the electrode.
- a cast iron mold with a ceramic insert as disclosed here has a substantially longer service than a mold of the same size that is made entirely from cast iron.
- FIG. 1 is a perspective view of a present preferred embodiment of my moldhaving a ceramic insert
- FIG. 2 is a front view thereof
- FIG. 3 is a top view thereof
- FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1 ;
- FIG. 5 is a perspective view of a present preferred embodiment of the ceramic insert used in the casting mold shown in FIGS. 1 through 4 ;
- FIG. 6 is a bottom view of the ceramic insert show in FIG. 5 ;
- FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5 ;
- FIG. 8 is a section view taken along the line VIII-VIII in FIG. 6 .
- FIGS. 1 through 4 I provide an improved mold 1 for casting ingots, electrodes and other metal parts that has a tubular body 2 with an opening 4 in the top 3 of the mold. Handles or lugs 9 are provided on the mold which allowed the mold to be lifted by an overhead crane using hooks that grab the handles.
- I provide a ceramic insert 10 that fits into the bottom of the mold closing off the mold cavity 5 .
- a recess 8 is provided in the cavity wall 6 at the bottom of the mold 1 . The recess is sized to receive the side walls 12 and end walls 13 of the ceramic insert 10 shown in FIGS. 5 through 8 .
- a bonding material is applied to the ceramic insert before it is placed within the recess to hold the ceramic insert in the mold.
- a bonding material sold under the trade name Ladle Lock by Reico Products, Inc. is suitable for this purpose.
- the binding material is applied to at least a portion of the sidewalls of the ceramic insert before the insert is placed in the mold.
- the ceramic insert 10 shown in FIGS. 5-8 and has a bottom 14 , side walls 12 , end walls 13 and an open top 15 .
- the ceramic insert preferably is made from a high alumina ceramic material having 75-85% alumina and 10-15% silicon oxide. This ceramic material should have a service temperature of approximately 3000° F. Ceramic material sold by United Refractories Incorporated under the trade name Unicrete 85 LC is a suitable ceramic material for the ceramic insert.
- I provide an electrode mold that is approximately 9 feet tall and has a top opening of approximately 9 inches by 36 inches.
- the side walls and the end walls of the ceramic insert are preferably one foot high.
- the recess 8 should have the same depth as the height of the ceramic insert such that when the ceramic insert 10 is inserted into the mold 1 the ceramic insert will be flush with the bottom of the mold. Lugs 16 are provided on the insert for ease of handling. Although I prefer the side walls and end walls of the ceramic insert have a height of one foot, these walls can be as tall as two feet. Hence the recess 8 may cover from 11% to 22% of the cavity wall 6 .
- the ceramic insert is placed in the mold as shown in FIG. 4 .
- Hot metal is then poured into the opening 4 at the top of the mold to fill cavity 5 .
- the metal will begin to pool first within the ceramic insert and then up through the cavity.
- This turbulence decreases as the mold is filled.
- Such turbulence has caused wear in cast iron molds without the ceramic insert, with the most wear occurring at the bottom of the mold.
- the turbulence is significantly lower when the depth of the molten metal in the ingot mold is about one foot. That is why I selected the height of the walls of the ceramic insert to be one foot high.
- the hot metal within the mold cools after having been poured to form a solid electrode.
- a hammer press or other device strikes the top of the electrode pushing it downward through the mold cavity 5 .
- the ceramic insert remains on the end of that electrode.
- the ceramic insert is broken away using a hammer or similar device.
- the ceramic insert eliminates all material loss from the end of the electrode covered by the insert, increasing the yield for the molding process. Indeed, I have found an increase in the yield using the electrode molds here described of as much as 75 pounds per electrode. This savings is significant. Consequently, the electrode mold with the ceramic insert here disclosed not only has a longer service life but also creates a higher yield.
- the mold as an electrode mold, metal ingots and other metal products can be with this mold.
- the mold here described is suitable for molding a variety of nickel base metal alloys including corrosion resistant nickel-chromium alloys and nickel-chromium-cobalt high temperature alloys as well as many cobalt base alloys and titanium base alloys.
Abstract
Description
- The invention relates to molds used for metal casting such as cast iron molds into which hot metal is poured and allowed to cool to form an ingot or electrode.
- Many metal alloys are made by mixing raw metals in selected proportions in a furnace and heating the mixture at a desired temperature for a selected time to melt the metals. In many processes the molten metal is taken from the furnace in ladles. Other additives may be added to the molten metal while the melt is in the ladle. Then the metal is poured from the ladle into molds. These molds are often made of cast iron or another metal having a higher melting point than the metal being melted. Those temperatures are often in the range of 2750° F. to 2800° F. (1510° C. to 1538° C.). The molten metal solidifies in the mold to form an ingot, electrode or other metal product. The metal product is removed from the mold for further processing. The mold is cleaned and then reused to form other metal products.
- Electrodes for arc welding and electric arc furnaces are commonly made by pouring molten metal into a cast iron tubular body that sits on a flat base. The molten metal solidifies inside that tubular body forming an electrode and then the tubular body is lifted off the base. Sometimes the electrode remains on the base when the tubular body is removed. At other times the electrode stays within the tubular body and must be removed from that body.
- When the electrode is removed from a tubular body or base, pieces of metal will remain in the tubular body, stuck to the bottom or sides, or on the base. These pieces of metal must be removed before the tubular body and base can be reused. Depending upon the size of the electrode as much as 75 pounds (34 kg) of metal may be left behind and becomes scrap.
- The pouring of hot metal into the electrode mold and the removal of the electrode causes wear on the mold. Consequently, electrode molds must be replaced or refurbished. Cast iron electrode molds have a life of about twenty heats. There has been a long, unsatisfied need for electrode molds, as well as other molds used to create other metal parts, which have a longer service life and which produce less scrap.
- Molds having cavities much smaller than the cavity in an electrode mold or ingot mold are used for making molded plastic products and for casting metal parts. In the plastic molding industry there are two basic types of molds. One type of mold is created by removing material from mating mold plates such that when the two mold plates are put together the corresponding cavities in the mold plates define a single cavity that has the shape of the product to be molded. Because the mold plates are made from wear-resistant metal alloys, conventional machining of these plates is extremely difficult, expensive, time consuming, and is also limited to machining simple mold cavity geometries.
- The second type of mold, known as an insert mold, has a mold body or mating mold plates which have a space that is sized to receive one or more inserts. Metal inserts are placed into the space machined into the mold plates or mold body. The inserts have cavities which together define the shape of the part to be molded. Inserts allow the use of lower cost and easier to machine metals for the mold plates and limit the use of wear-resistant metal alloys to the metal inserts. However, as with the first method, this approach requires expensive and time consuming metal removal methods to create the cavity shape within the metal insert.
- It is also known in the art to use mold inserts made of a ceramic material in molds used for plastic injection molding. U.S. Pat. No. 4,704,079 to Pluim Jr, discloses a multi-part mold for injection molding of plastic parts. This mold is made up of at least two parts. There is a mold block portion having a ceramic mold cavity insert. The ceramic mold cavity inserts define the walls of the mold cavity when the mold is closed. Each mold cavity insert comprises a shaped ceramic body having a mounting surface adapted to fit under compressive stress throughout the entire molding operation within a mounting cavity of the mold block portion.
- Injection molding is extremely hard on molds. Although some ceramic inserts last longer than others, they all suffer eventually because of distortion, erosion of the mold cavity surface, heat checking from thermal shock, and for other reasons. In order for a ceramic insert to be utilized in a mold cavity for high pressure molding, it is necessary to secure it in a mounting cavity in the mold block or mold body portion in such a way as to maintain it in a state of compressive stress throughout the molding or casting cycle. This will provide a tight fit of the insert in the mold block despite differences in the thermal expansion and thereby provide efficient transfer of impact energy and thermal energy to the mold block. Consequently, the space that receives the ceramic insert, as well as the insert itself must be specially configured to fit together in a way that provides a tight fit.
- U.S. Pat. No. 7,302,989 Kamel, et al. discloses a mold system that may include a method of producing a ceramic core usable in production of a turbine airfoil. The method may include building a mold plate having at least one mold cavity configured to receive an insert and installing an insert in that cavity. Installing the insert in the cavity preferably includes installing a ceramic insert fully or partially formed from silicon carbide. The insert may include a coating formed from a chemical vapor deposition of a nonporous material, which may be silicon carbide. The ceramic insert may be formed from a net shape process. The mold plate may be formed with soft steels, such as P20 or NAK55, aluminum, aluminum-epoxy, and other appropriate materials. Materials such as abrasive resistant steels are not preferred because such materials are difficult to machine and require EDM processes.
- In the molding systems in which ceramic inserts have been used the amount of material that enters the mold cavity is usually a small fraction of the amount of molten metal that is poured in an electrode mold or ingot mold and those molds operate at much lower temperatures. Consequently, the use of ceramic inserts in molds for injection molding of plastics has not been considered as being transferrable to molds used in steel making.
- I provide a mold useful for casting electrodes or other metal parts which has a body having an open top, a bottom with an opening, and a longitudinal cavity passing through the body. The cavity defined by a cavity wall extending from the top to the bottom of the body. There is a recess in the cavity wall adjacent the opening in the bottom of the body. A ceramic insert having sidewalls is positioned within the cavity such that the sidewalls are in the recess in the cavity wall. The body of the ingot mold preferably is cast iron. The ceramic insert preferably is made of a high alumina ceramic.
- The ceramic insert fits within the recess in the cavity wall and is held in place with a bonding material. Molten metal is poured into the top of the mold to substantially fill the cavity. The molten metal cools within the cavity to form an electrode. Then the electrode and the ceramic insert are removed from the mold. During the removal the ceramic insert is attached to one end of the electrode. After removal of the electrode from the mold the ceramic insert is removed from the electrode.
- Use of the ceramic insert eliminates all material loss from the end of the electrode covered by the insert, increasing the yield for the molding process. Additionally, a cast iron mold with a ceramic insert as disclosed here has a substantially longer service than a mold of the same size that is made entirely from cast iron.
- Other objects and advantages of my mold with ceramic insert and method of casting electrodes using that mold will become apparent from a description of certain present preferred embodiments thereof which are shown in the drawings.
-
FIG. 1 is a perspective view of a present preferred embodiment of my moldhaving a ceramic insert; -
FIG. 2 is a front view thereof; -
FIG. 3 is a top view thereof; -
FIG. 4 is a sectional view taken along the line IV-IV inFIG. 1 ; -
FIG. 5 is a perspective view of a present preferred embodiment of the ceramic insert used in the casting mold shown inFIGS. 1 through 4 ; -
FIG. 6 is a bottom view of the ceramic insert show inFIG. 5 ; -
FIG. 7 is a sectional view taken along the line VII-VII inFIG. 5 ; -
FIG. 8 is a section view taken along the line VIII-VIII inFIG. 6 . - Referring to
FIGS. 1 through 4 I provide an improved mold 1 for casting ingots, electrodes and other metal parts that has atubular body 2 with an opening 4 in thetop 3 of the mold. Handles or lugs 9 are provided on the mold which allowed the mold to be lifted by an overhead crane using hooks that grab the handles. As can be seen most clearly inFIG. 4 , I provide aceramic insert 10 that fits into the bottom of the mold closing off themold cavity 5. Arecess 8 is provided in thecavity wall 6 at the bottom of the mold 1. The recess is sized to receive theside walls 12 and endwalls 13 of theceramic insert 10 shown inFIGS. 5 through 8 . A bonding material is applied to the ceramic insert before it is placed within the recess to hold the ceramic insert in the mold. A bonding material sold under the trade name Ladle Lock by Reico Products, Inc. is suitable for this purpose. The binding material is applied to at least a portion of the sidewalls of the ceramic insert before the insert is placed in the mold. - The
ceramic insert 10, shown inFIGS. 5-8 and has a bottom 14,side walls 12,end walls 13 and an open top 15. The ceramic insert preferably is made from a high alumina ceramic material having 75-85% alumina and 10-15% silicon oxide. This ceramic material should have a service temperature of approximately 3000° F. Ceramic material sold by United Refractories Incorporated under the trade name Unicrete 85 LC is a suitable ceramic material for the ceramic insert. - In one embodiment of my invention I provide an electrode mold that is approximately 9 feet tall and has a top opening of approximately 9 inches by 36 inches. The side walls and the end walls of the ceramic insert are preferably one foot high. The
recess 8 should have the same depth as the height of the ceramic insert such that when theceramic insert 10 is inserted into the mold 1 the ceramic insert will be flush with the bottom of the mold.Lugs 16 are provided on the insert for ease of handling. Although I prefer the side walls and end walls of the ceramic insert have a height of one foot, these walls can be as tall as two feet. Hence therecess 8 may cover from 11% to 22% of thecavity wall 6. - The ceramic insert is placed in the mold as shown in
FIG. 4 . Hot metal is then poured into the opening 4 at the top of the mold to fillcavity 5. As the hot metal is poured into the bottom of the mold the metal will begin to pool first within the ceramic insert and then up through the cavity. As the metal begins to pool there is substantial turbulence within the molten metal. This turbulence decreases as the mold is filled. Such turbulence has caused wear in cast iron molds without the ceramic insert, with the most wear occurring at the bottom of the mold. The turbulence is significantly lower when the depth of the molten metal in the ingot mold is about one foot. That is why I selected the height of the walls of the ceramic insert to be one foot high. For some molds, one may find that taller sidewalls are preferred. In any event, it is not necessary that the ceramic insert cover all or substantially all of the mold cavity walls. By providing a ceramic insert the amount of damage to the mold caused by the initial portion of the pour is reduced. I have been able to use a cast iron electrode mold with a ceramic insert like the mold shown in the drawings for 150 heats. This is a substantial increase in the service life of cast iron electrode molds. - The hot metal within the mold cools after having been poured to form a solid electrode. After the electrode has been formed a hammer press or other device strikes the top of the electrode pushing it downward through the
mold cavity 5. As the electrode is removed from the mold, the ceramic insert remains on the end of that electrode. After the electrode has been removed from the mold the ceramic insert is broken away using a hammer or similar device. - Use of the ceramic insert eliminates all material loss from the end of the electrode covered by the insert, increasing the yield for the molding process. Indeed, I have found an increase in the yield using the electrode molds here described of as much as 75 pounds per electrode. This savings is significant. Consequently, the electrode mold with the ceramic insert here disclosed not only has a longer service life but also creates a higher yield.
- Although I have described the mold as an electrode mold, metal ingots and other metal products can be with this mold.
- The mold here described is suitable for molding a variety of nickel base metal alloys including corrosion resistant nickel-chromium alloys and nickel-chromium-cobalt high temperature alloys as well as many cobalt base alloys and titanium base alloys.
- Although I have described certain present preferred embodiments of my ingot mold having a ceramic insert and casting method using this mold it should be distinctly understood that my invention is not limited thereto but may be variously embodied within the following claims:
Claims (14)
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US13/599,236 US8662143B1 (en) | 2012-08-30 | 2012-08-30 | Mold having ceramic insert |
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US20140060769A1 true US20140060769A1 (en) | 2014-03-06 |
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CA2861581C (en) | 2011-12-30 | 2021-05-04 | Scoperta, Inc. | Coating compositions |
WO2015081209A1 (en) | 2013-11-26 | 2015-06-04 | Scoperta, Inc. | Corrosion resistant hardfacing alloy |
CN106661702B (en) | 2014-06-09 | 2019-06-04 | 斯克皮尔塔公司 | Cracking resistance hard-facing alloys |
JP7002169B2 (en) | 2014-12-16 | 2022-01-20 | エリコン メテコ(ユーエス)インコーポレイテッド | Multiple hard phase-containing iron alloys with toughness and wear resistance |
AU2016317860B2 (en) | 2015-09-04 | 2021-09-30 | Scoperta, Inc. | Chromium free and low-chromium wear resistant alloys |
CA2996175C (en) | 2015-09-08 | 2022-04-05 | Scoperta, Inc. | Non-magnetic, strong carbide forming alloys for powder manufacture |
CA3003048C (en) | 2015-11-10 | 2023-01-03 | Scoperta, Inc. | Oxidation controlled twin wire arc spray materials |
ES2898832T3 (en) | 2016-03-22 | 2022-03-09 | Oerlikon Metco Us Inc | Fully readable thermal spray coating |
US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
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US4704079A (en) | 1984-04-02 | 1987-11-03 | Minnesota Mining And Manufacturing Company | Mold having ceramic insert |
JPH04305340A (en) * | 1991-03-30 | 1992-10-28 | Sumitomo Metal Ind Ltd | Casting mold for continuous casting and casting method by using the mold |
US20070187061A1 (en) * | 2006-02-13 | 2007-08-16 | Kennametal Inc. | Sleeve for die casting shot tube |
US7302989B1 (en) | 2006-06-06 | 2007-12-04 | Siemens Power Generation, Inc. | Modular mold system with ceramic inserts |
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