US20150298201A1 - Riser sleeve with air gap - Google Patents

Riser sleeve with air gap Download PDF

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Publication number
US20150298201A1
US20150298201A1 US14/443,528 US201314443528A US2015298201A1 US 20150298201 A1 US20150298201 A1 US 20150298201A1 US 201314443528 A US201314443528 A US 201314443528A US 2015298201 A1 US2015298201 A1 US 2015298201A1
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US
United States
Prior art keywords
riser sleeve
sleeve
riser
cavities
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/443,528
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English (en)
Inventor
Ronald C. Aufderheide
Sean R HARMON
Lee R HORVATH
Ralph E SHOWMAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASK Chemicals LLC
Original Assignee
ASK Chemicals LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ASK Chemicals LLC filed Critical ASK Chemicals LLC
Priority to US14/443,528 priority Critical patent/US20150298201A1/en
Publication of US20150298201A1 publication Critical patent/US20150298201A1/en
Assigned to ASK CHEMICALS, L.P. reassignment ASK CHEMICALS, L.P. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HORVATH, LEE R., SHOWMAN, RALPH E., HARMON, SEAN B., AUFDERHEIDE, RONALD C.
Assigned to HSBC CORPORATE TRUSTEE COMPANY (UK) LIMITED, AS SECURITY AGENT reassignment HSBC CORPORATE TRUSTEE COMPANY (UK) LIMITED, AS SECURITY AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASK CHEMICALS L.P.
Assigned to ASK Chemicals LLC reassignment ASK Chemicals LLC CONVERSION Assignors: ASK CHEMICALS LP
Assigned to ASK Chemicals LLC reassignment ASK Chemicals LLC CONVERSATION Assignors: ASK CHEMICALS L.P.
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B22C9/088—Feeder heads

Definitions

  • the disclosed embodiments of the present invention relate to a riser sleeve for use in the casting of molten metal, and, in particular, to a riser sleeve that is shaped around an exterior surface thereof to provide closed cavities when the riser sleeve is inserted into a riser cavity of a foundry mold.
  • the cavities are positioned in the sleeve to run as generally vertical depressions along the sleeve exterior when the riser sleeve is operationally positioned in the foundry mold.
  • riser sleeves and their use are well known in the prior art.
  • a riser sleeve operates in a foundry mold as a conduit and as a reservoir.
  • molten metal is poured into a preformed cavity shaped in the nature of the product being formed, a portion of the poured metal flows into and accumulates in the riser.
  • shrinkage of the solidified metal in the mold would result in dimensional changes and possibly internal cavities, in the absence of a riser.
  • the loss of heat from the metal in the riser cavity primarily occurs at the interface of the metal with the mold.
  • riser sleeves themselves are not a part of the finished casting. Once the casting has properly cooled, the risers are removed as a part of the foundry mold.
  • the sleeve for use in a foundry molding operation.
  • the sleeve has a body with an outside wall that extends from a bottom to a top of the body.
  • the riser sleeve is characterized by a plurality of cavities that are formed on the side wall, extending from the top in an axial direction of the body.
  • the body is cylindrical. In other instances, the body is frustoconical, preferably with a diameter that decreases uniformly from the bottom to the top.
  • each of the plurality of cavities is preferably substantially semi-cylindrical, each cavity having an axis that is preferably aligned along a virtual circumferential area of the outside side wall that does not comprise the cavities.
  • each cavity is characterized by a radius, such that the axes of adjacent cavities are spaced apart by a distance of at least four radii around the circumference of the riser sleeve.
  • each cavity preferably subtends an angle in the range of from about 120° to about 180°, as measured from the axis of the cavity.
  • each cavity extends along the outside wall over a majority of a distance from the top towards the bottom, but each cavity terminates above the bottom.
  • the plurality of cavities are substantially uniformly spaced around a circumference of the body.
  • the body is substantially hollow, with an interior wall or surface that is cylindrical or that tapers from bottom to top in a manner that corresponds to the side wall.
  • FIG. 1 is a perspective view of a formed riser sleeve as known in the prior art before imparting the air gaps of the claimed invention
  • FIG. 2 is a perspective view of the formed riser sleeve of FIG. 1 , after the air gaps have been formed thereon;
  • FIG. 3 is a perspective view of a riser sleeve of the claimed invention, shown in partial sectional view on a mold pattern.
  • riser sleeves are one of two types.
  • Blind riser sleeves comprise a hollow dome-shaped riser sleeve, which is open at the bottom.
  • Open-top riser sleeves are generally annular shaped, that is, open at both top and bottom.
  • Blind riser sleeves are more expensive to manufacture. Their use is typically reserved to special applications.
  • Open-top riser sleeves allow the casting operator to see the progress of the cast by visualizing the level of the molten metal in the riser sleeve.
  • the term “riser sleeve” is used generically to apply to both types, unless there is specific reference to one of the types.
  • the riser sleeves may be inserted into the mold cavity after the mold is formed. This is generally referred to as an insertable sleeve.
  • the riser sleeve may also be placed on the pattern and the mold formed around the sleeve to create the riser cavity. This is generally referred to as a “ram-up” sleeve).
  • ram-up sleeve
  • the wall of the sleeve will have a uniform thickness and fit tightly into the mold with negligible gap between the sleeve and the mold.
  • riser sleeves are manufactured from heat insulating materials, with the intent of slowing the solidification of the molten metal contained within the riser sleeve before it passes to the cavity in the foundry mold.
  • the riser sleeves may be made from exothermic materials intended to generate heat to maintain fluidity of the molten metal.
  • Typical riser sleeves are manufactured from refractory materials, including man-made fibers. They may include fuels such as aluminum or silicon which are used to produce their respective heat insulating oxides during an exothermic reaction within the riser sleeve. Properties sought to be optimized in riser design include low density and high porosity, as these facilitate the heat insulating properties.
  • Feeding aids are used to slow and control the solidification of the riser. These may be insulating or exothermic sleeves or “hot topping”.
  • a sleeve consists of material that lines at least part of the riser cavity, to slow the heat loss from the riser by providing insulation or additional heat input from an exothermic material or both.
  • Hot toppings are insulating or exothermic material used to cover the top of the riser after pouring where the riser is open through the top of the mold.
  • Sleeves can be manufactured from a variety of different materials including refractory fibers, sand, hollow refractory spheres, as well as other refractory materials.
  • Refractory fiber sleeves are typically formed by depositing the fiber and other ingredients onto a wire mesh form that creates the internal dimensions of the sleeve. The fiber and other ingredients are in a water-based slurry and are deposited on the form by drawing a vacuum on the interior of the form. This creates a sleeve with a somewhat rough external surface.
  • Sleeves made from sand or from hollow spheres plus other ingredients can be formed by blowing a mixture of the dry ingredients and a liquid foundry binder into a mold/corebox and curing the binder in the mold to create a solid sleeve with both internal and external shapes formed by the mold.
  • the walls of a riser sleeve made from sand or hollow spheres will tend to be more uniform than those made from fibrous materials and this may make the sand/hollow sphere riser sleeves more amenable to the implementation of the inventive concept.
  • the insulating or exothermic properties of a riser sleeve is predominantly determined by the material used to create the sleeve.
  • a fiber refractory sleeve will typically have a lower density than the mold material and provide insulation because of lower heat capacity and thermal conductivity.
  • a sand exothermic sleeve may contain a relatively high percentage of exothermic material, typically thermite of a mixture of metallic aluminum powder and iron oxide. When the riser is filled with molten metal the thermite ignites and provides a secondary heat source for the riser.
  • FIG. 1 a perspective view of a riser sleeve blank 10 is shown.
  • This sleeve blank 10 is shown as being slightly frusto-conate, with a diameter that decreases uniformly and monotonically from a bottom or base to a top 12 . Both the top 12 and the base are depicted as being normal to a central axis of the blank 10 .
  • riser sleeve blank 10 is of the blind-type, it has the flattened top 12 .
  • the sleeve blank 10 could easily be cylindrical, with a consistent diameter from top to base.
  • the sleeve blank 10 shows a smooth and consistent texture to the outside walls 14 and can be produced from a variety of different materials.
  • FIG. 2 A perspective view of an embodiment 100 of a riser sleeve having the inventive concept is provided in FIG. 2 .
  • the specific embodiment 100 which is also depicted as being of the blind-type, there are ten depressions or cavities 102 formed on the outside wall 14 .
  • This plurality of cavities 102 is depicted as arranged in a substantially uniform spacing around the circumference of the outside wall 14 , although the uniform spacing is not considered critical to the efficacy of the riser sleeve being formed.
  • the body of the embodiment 100 is depicted as cylindrical, it will be known to those of skill that some casting situations will require other shapes, such as an oval or flat-faced shape, but that these shapes can also be formed with a plurality of cavities in the same manner as is depicted with the cylindrical embodiment.
  • the depressions or cavities 102 on the embodiment 100 are depicted as being substantially semi-cylindrical.
  • An axis of each semi-cylindrical cavity 102 is generally aligned along the outside wall 14 , with the effect being that the respective axes reflect the slightly conate or generally cylindrical nature of the overall riser sleeve 100 .
  • a top end of each cavity 102 is open and provides a “scalloped” circumference to the top 12 .
  • the cavities 102 are depicted as extending a substantial portion of the height of the riser sleeve 100 from the top of the sleeve in an axial direction of the sleeve, but each cavity clearly terminates above the base. This results in a cylindrical ring around the base of the riser sleeve, with the intent of forming a tight seal with the mold, preventing liquid metal from flowing into the cavities during the pour.
  • the axes of adjacent cavities will be spaced apart by a distance of at least 4R around the circumference of the riser sleeve 100 .
  • at least one-half of the original surface of the outside walls 14 will be preserved for contact with the mold, although it may prove to be desirable to have about 40% of the side wall removed in the creation of the cavities.
  • the cavities 102 are semi-cylindrical, that is, the axis of the cavity is effectively located along the surface or outside wall 14 , and an angle of approximately 180° is subtended between adjacent edges of a given cavity.
  • the subtended portion of the cylinder would be at least 120° and in almost all cases will be less than 180°.
  • cavities 102 By imposing these cavities 102 , a corresponding number of closed air gaps are formed between the sleeve and the mold when the sleeve is inserted into the mold. These cavities 102 will trap air in them.
  • the air-filled cavities 102 would have very low heat capacity and thermal conductivity compared to both the mold material and the sleeve. They will further reduce the contact area between the mold and the sleeve, reducing conductive heat loss.
  • the cavities 102 also provide additional insulation. This could result in better performance by the sleeve and would also result in lower sleeve weight and material cost, as the primary thickness of the riser sleeve blank would not be increased in order to impose the cavities.
  • the sleeve 100 can improve feeding efficiency and allow the use of smaller risers and sleeves for improved casting yield.
  • the use of the riser sleeve 100 is shown in a perspective schematic manner in FIG. 3 , in which the riser sleeve is shown mounted on a mold pattern 40 , and, more particularly, on a mounting plug 42 of the mold pattern.
  • a paper, cardboard, plastic film, or similar material covering can be placed over the sleeve, with the paper or similar material forming the outside surface of the air filled cavity and preventing infiltration by the molding sand as the mold is rammed into position.
  • the riser sleeve 100 will be significantly hollow, either due to the process by which it is initially formed or from the removal of material.
  • the interior surface 104 will have preferably have a taper from bottom to top 12 that will correspond to that of outer surface 14 , except for the cavities, which are found only on the outer surface.
  • the depicted riser sleeve having the inventive features is a so-called “blind” riser sleeve as described above.
  • blind riser sleeve

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Continuous Casting (AREA)
  • Mold Materials And Core Materials (AREA)
US14/443,528 2012-11-19 2013-11-19 Riser sleeve with air gap Abandoned US20150298201A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/443,528 US20150298201A1 (en) 2012-11-19 2013-11-19 Riser sleeve with air gap

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201261727932P 2012-11-19 2012-11-19
PCT/US2013/070644 WO2014078822A2 (fr) 2012-11-19 2013-11-19 Manchon de masselotte avec lame d'air
US14/443,528 US20150298201A1 (en) 2012-11-19 2013-11-19 Riser sleeve with air gap

Publications (1)

Publication Number Publication Date
US20150298201A1 true US20150298201A1 (en) 2015-10-22

Family

ID=49681212

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/443,528 Abandoned US20150298201A1 (en) 2012-11-19 2013-11-19 Riser sleeve with air gap

Country Status (13)

Country Link
US (1) US20150298201A1 (fr)
EP (1) EP2919929B1 (fr)
JP (1) JP2015534906A (fr)
KR (1) KR102118990B1 (fr)
CN (1) CN104936722A (fr)
BR (1) BR112015011090A2 (fr)
CA (1) CA2891923A1 (fr)
ES (1) ES2819199T3 (fr)
MX (1) MX2015006228A (fr)
PL (1) PL2919929T3 (fr)
RU (1) RU2015122328A (fr)
WO (1) WO2014078822A2 (fr)
ZA (1) ZA201502947B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105598375A (zh) * 2016-01-11 2016-05-25 共享装备股份有限公司 铸造用出气系统
CN117324550A (zh) * 2023-11-02 2024-01-02 共赢装备制造有限公司 一种挡砂帽装置及其使用方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104001861B (zh) * 2014-06-13 2016-09-28 常州南车汽车零部件有限公司 一种潮模上型放置冒口套装置及方法
CN112719222A (zh) * 2020-12-30 2021-04-30 安徽省恒泰动力科技有限公司 一种双喇叭口陶瓷纤维冒口套及其制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5017930Y1 (fr) * 1970-11-19 1975-06-02
JPS51149123A (en) * 1975-02-08 1976-12-21 Meiwa Kagaku Kogyo Heat insulation sleeves for riser in casting
GB2141649B (en) * 1983-06-20 1986-09-03 Steetley Refractories Ltd Riser sleeve for metal-casting moulds
US4526338A (en) * 1984-04-23 1985-07-02 General Foundry Products Corporation High pressure molding riser
US4981166A (en) * 1989-06-27 1991-01-01 Brown Foundry Systems, Inc. Foundry paper riser and system therefor
US6209617B1 (en) * 1996-11-06 2001-04-03 American Metal Chemical Corporation Sealing riser sleeve
US6422791B1 (en) * 2000-04-04 2002-07-23 Abb Vetco Gray Inc. Riser to sleeve attachment for flexible keel joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105598375A (zh) * 2016-01-11 2016-05-25 共享装备股份有限公司 铸造用出气系统
CN117324550A (zh) * 2023-11-02 2024-01-02 共赢装备制造有限公司 一种挡砂帽装置及其使用方法

Also Published As

Publication number Publication date
KR20150101451A (ko) 2015-09-03
ZA201502947B (en) 2016-01-27
WO2014078822A2 (fr) 2014-05-22
BR112015011090A2 (pt) 2017-07-11
KR102118990B1 (ko) 2020-06-04
MX2015006228A (es) 2015-08-12
CA2891923A1 (fr) 2014-05-22
RU2015122328A (ru) 2017-01-10
EP2919929A2 (fr) 2015-09-23
PL2919929T3 (pl) 2020-12-28
CN104936722A (zh) 2015-09-23
ES2819199T3 (es) 2021-04-15
WO2014078822A3 (fr) 2014-07-10
EP2919929B1 (fr) 2020-07-15
JP2015534906A (ja) 2015-12-07

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AS Assignment

Owner name: ASK CHEMICALS, L.P., DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AUFDERHEIDE, RONALD C.;HARMON, SEAN B.;HORVATH, LEE R.;AND OTHERS;SIGNING DATES FROM 20150827 TO 20151009;REEL/FRAME:036935/0461

AS Assignment

Owner name: HSBC CORPORATE TRUSTEE COMPANY (UK) LIMITED, AS SE

Free format text: SECURITY INTEREST;ASSIGNOR:ASK CHEMICALS L.P.;REEL/FRAME:042962/0520

Effective date: 20170622

AS Assignment

Owner name: ASK CHEMICALS LLC, DELAWARE

Free format text: CONVERSION;ASSIGNOR:ASK CHEMICALS LP;REEL/FRAME:045149/0147

Effective date: 20171031

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: ASK CHEMICALS LLC, OHIO

Free format text: CONVERSATION;ASSIGNOR:ASK CHEMICALS L.P.;REEL/FRAME:063196/0385

Effective date: 20171031