US3903950A - Sandwich structure mold - Google Patents

Sandwich structure mold Download PDF

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Publication number
US3903950A
US3903950A US427732A US42773273A US3903950A US 3903950 A US3903950 A US 3903950A US 427732 A US427732 A US 427732A US 42773273 A US42773273 A US 42773273A US 3903950 A US3903950 A US 3903950A
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US
United States
Prior art keywords
mold
binder
intermediate layer
layer
pattern
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.)
Expired - Lifetime
Application number
US427732A
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English (en)
Inventor
Nicholas G Lirones
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.)
Howmet Turbine Components Corp
Howmet Corp
Original Assignee
Howmet Corp
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 Howmet Corp filed Critical Howmet Corp
Priority to US427732A priority Critical patent/US3903950A/en
Priority to GB50932/74A priority patent/GB1486326A/en
Priority to CA215,015A priority patent/CA1039925A/fr
Priority to DE19742459088 priority patent/DE2459088C3/de
Priority to FR7441463A priority patent/FR2255977B1/fr
Priority to JP49144586A priority patent/JPS5223883B2/ja
Priority to SE7416046A priority patent/SE420799B/xx
Priority to IT54755/74A priority patent/IT1026158B/it
Priority to BE151925A priority patent/BE823853A/fr
Application granted granted Critical
Publication of US3903950A publication Critical patent/US3903950A/en
Assigned to HOWMET TURBINE COMPONENTS CORPORATION, A CORP.OF DE reassignment HOWMET TURBINE COMPONENTS CORPORATION, A CORP.OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOWMET CORPORATON A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/165—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents in the manufacture of multilayered shell moulds

Definitions

  • the mold 1 has inner and outer layers, the essential ingredients of [52] U.S. 164/26; l06/38i35; 164/36 [51] 822C [/08; 822C l/lO which include a ceramic refractory material and an inorganic binderv Intermediate layers are disposed between the inner and outer layers and em ganic Int.
  • This invention relates to the art of precision casting and to materials employed in the practice thereof. More particularly, the invention relates to a casting process and to compositions and methods used in the preparation of molds.
  • a basic process employed in casting precision parts is known as the lost wax process.
  • This process is partic ularly adapted to producing precision castings for the production of turbine blades, vanes, as well as other complex parts.
  • the conventional lost wax process consists of producing disposable patterns formed of wax, plastic or other suitable material having the desired shape. If necessary, these patterns are assembled into clusters to form a complete assembly.
  • the patterns are then dipped into a ceramic slurry dipcoat containing a colloidal silica or other inorganic binder. While the pattern is wet from the dipcoat. it is stuccoed with granular refractory particles and then dried. This forms a coating on the patterns and by repeating the dipping, stuccoing and drying steps, a mold of a desired thickness can be formed about the pattern.
  • the pattern is then removed from the mold and the mold is heated to a temperature whereby the silica binder cures and strongly bonds the ceramic dipcoating and granular stucco into a monolithic mass. After inspection, the mold is preheated to a high temperature suitable for receiving molten metal.
  • the casting After pouring the metal, the casting is allowed to cool to a solidified state. At this stage, the mold strength can be higher than the metal strength, often resulting in hot tears on the casting. After cooling, the mold is broken away from the casting by mechanical or pneumatic vibration, salt bathing, sand blasting or other techniques.
  • the above described techniques for separation of the casting from the mold have several disadvantages.
  • the high amplitude mechanical vibration necessary to break the mold can cause cracking of the casting.
  • Salt bathing techniques and sand blasting are excessively time consuming and also detrimental to the casting surface in that intergranular attack and surface erosion occurs.
  • a mold for casting precision parts is formed by dipping a wax or plastic pattern into a dipcoat of a first composition including finely divided refractory materials and an inorganic binder, such as a silica binder. While the pattern is still wet, it is stuccoed with granular refractory particles, and then dried. This sequence is repeated as desired to build up an inner layer ofa desired thickness. The pattern and inner layer are then dipped into a second dipcoat, the principal constituents of which are finely divided refractory material and an organic fugitive binder. After stuccoing, this coating is dried. This intermediate layer may be built up as desired by repeating the sequence.
  • an outer layer is formed over the intermediate layer and is composed somewhat of the same inorganic constituents as the inner layer, thereby forming a mold which is sandwich structured.
  • the organic fugitive binder of the intermediate layer is substantially eliminated by burning and/or volatilization. This leave the materials of the intermediate layer without binder sandwiched between the inner and outer layers.
  • the sandwich mold is easily removed from the casting by collapsing the outer layer onto the intermediate layer and removing the thin inner layer. This mold avoids hot tears as well as cracking in the casting due to the force heretofore required for mold removal.
  • FIG. I is a schematic sectional view through a pattern having a mold formed thereon in accordance with the practice of this invention.
  • FIG. 2 is a flow diagram of the process embodying the practice of this invention.
  • a mold phase which includes the compositions employed in the manufacture of the mold and the method for the production thereof, and the use phase wherein the formed mold is employed in the process of molding compositions and materials.
  • the mold phase will be described with reference to compositions employed and the methods of manufacture in a representative process illustrating the practice of this phase of the invention.
  • pattern will be used interchangeably with cluster to refer to a wax or plastic pattern 10 or a cluster formed of a multiplicity of such individual patterns.
  • the pattern 10 is formed of conventional materials disposable by heat or chemicals. If the mold is to be formed about more than one pattern, the plurality of patterns are connected by runners for communication with a pouring spout to form a completed cluster, as described in the issued US. patent to Lirones. US. Pat. No. 3.266,IU6. Where the cluster is to be repeatedly dipped into slurry. identified as a dipcoat, it is desirable to provide a hanger rod for carrying the cluster and for suspending the cluster for drying and the like.
  • First Dipcoating Composition 8000 cc. colloidal silica (30% grade) (specific gravity 165 pounds zircon (99% through 325 mesh) 6150 cc. water 1 grams sodium fluoride
  • the pattern or cluster is first inspected to remove dirt, flakes and other objects which may have adhered to the surfaces of the pattern and which, if allowed to remain, would impair the preparation of a good mold and lead to an unacceptable casting.
  • the cleaned clus ter is immersed into the stirred dipcoat composition to cover all of the surfaces of the cluster.
  • the dipcoat composition can be applied by spraying the dipcoat composition onto the surfaces of the pattern.
  • the pattern or cluster When fully wet, the pattern or cluster is suspended to drain excess dipcoat composition.
  • the cluster can be inspected to detect air pockets which can be eliminated by addressing a stream of air onto the uncoated portions and thereafter allowing the slurry of the dipcoat composition to flow onto the uncovered area.
  • the cluster While the cluster is being drained, it should be held in different spatial planes designed to achieve uniform coating on all surfaces. In general, drainage should be completed within a few minutes but, in any event, in less time than would allow the dipcoat composition to dry whereby the surface would not retain stucco, as will be described.
  • the stucco is sprinkled onto the wet cluster substantially uniformly to cover the wet surfaces with a layer of the stucco while, at the same time, minimizing flow of the dipcoat whereby nonuniformities might otherwise develop.
  • the stucco particles will be rained down from above through a screening member constantly being fed by a vibratory feeder to remove foreign matter from the Alundum particles, while the particles are sprinkled over an area to give more uniform and complete coverage.
  • the stucco will adhere to the wet coating of the slurry and will become partially embedded in the slurry to become integrated with the coating formed on the cluster of wax patterns.
  • the first dipcoat composition and stucco are built up onto the pattern to form an inner layer l2 of a desired thickness.
  • the pattern is then emersed into a second dipcoat to form an intermediate layer 14.
  • Example A -325 Mesh Alumina Flour 3500 Gr Polyvinyl Alcohol (7.2664 aqueous Solution) 1033 Gr Potato Starch (3% Water Solution) 938 Gr Anionic Wetting Agent 4" cc
  • Example B 325 Mesh Alumina Flour 3500 Gr Polyvinyl Alcohol (726% Aqueous Solution) 2000 Gr Anionic Wetting Agent 42 cc
  • Example C- 400 Mesh Zircon Flour 4040 Gr Polyvinyl Alcohol (7.26% Aqueous Solution) 1033 Gr Potato Starch (3')?
  • the gum tragacanth solution has the following compositions:
  • Gum Tragacanth Powder 445 Gr Sodium Benzoate S Gr Water 20,000 Gr As the anionic wetting agent, use can be made of sodium heptadecyl sulphate, such as Tergitol Anionic No. 7 of Union Carbide Corporation.
  • Antifoam Colloid No. SXlB produced by Colloids, lnc., Newark, NJ.
  • the second dipcoat composition is applied to the coated pattern in a manner similar to that of the first dipcoat composition.
  • a significant difference between the dipcoat compositions is in the selection of the binder.
  • the first dipcoat composition employs a colloidal silica binder.
  • the second dipcoat composition preferably utilizes an organic fugitive binder as, for example, Polyvinyl alcohol.
  • organic fugitive binder it is intended to describe an organic compound which is ca pablc of being volatilized and/or burned out by heating or otherwise.
  • organic fugituve binder it is possible to form a second intermediate layer about the pattern. and at a subsequent time drive off the binder to leave the intermediate layer closely packed but unbound.
  • the prewetting composition includes additional amounts of water sufficient to reduce the total solids to about 25 to 75 percent of the total solids in the dipcoat composition.
  • the pattern is again allowed to drain and is stuccoed and dried.
  • the steps of pre-wetting, dipcoating, stuccoing and drying are repeated one or more times, as necessary, to build up the intermediate layer 14 to a desired thickness.
  • the stucco employed for the intermediate layer may be the same as that employed for the inner layer.
  • colloidal silica binder For special applications and particularly where large molds are utilized, it is desirable to add a very small percentage, on the order of 0. l 25 percent by weight, of colloidal silica binder to the second dipcoat composition which also contains the organic fugitive hinder as previously discussed.
  • the presence of the colloidal silica binder prevents the intermediate layer from becoming completely powdery after the fugitive binder is driven off as will be described.
  • the small amount of silica binder added to the second dipcoat does not in crease the strength or increase the task of removal but permits patching and repair of the mold should such operations be necessary.
  • the following example illustrates the use of a small amount of silica binder in the second dipcoat:
  • the composition of the third dipcoat. which forms the outer layer 16 of the mold can, but need not be, the same as the composition of the first dipcoat. It is applied and stuccoed in a manner similar to that of the first dipcoat. However, usually a coarser stucco is applied.
  • the outer layer l6 has been built up to a desired thickness the mold is subjected to a final drying cycle.
  • dipcoats required to form each of the three layers of the sandwich structure for an average weight casting two dipcoatings have been employed to form the inner layer 12, three dipcoatings have been employed to form the intermediate layer 14, followed by two dipcoats in the first dipcoat composition to form the outer layer 16.
  • the thickness of the layers may be increased as necessary.
  • dewaxing can be achieved in a number of ways, as disclosed in US. Pat. No. 3,266,l06.
  • dewaxing can be achieved by firing it to a high temperature.
  • the colloidal silica binder in the inner and outer layers 12 and 16 strongly bonds the ceramic dipcoat and granular stucco into a monolithic mass.
  • the organic fugitive binder in the intermediate layer 14 is volatilized and/or burned out leaving the materials making up the intermediate layer unbonded and sandwiched between the inner and outer bonded layers.
  • the sandwich structure mold of the present invention can be dewaxed at a lower tempera ture on the order of 200 to 400 F. This dewaxing method is possible due to the high green strength achieved in the present sandwich structure mold.
  • the sandwich mold is dewaxed at a low temperature. then it will be preheated to a high temperature prior to use, as indicated in H0. 2, for burning out the mold, i.e., removing any small traces of remaining wax, for burning out or volatilizing the organic binder used for the intermediate layer and for curing the silica binder. Preheating is usually carried out at temperatures in the range of l,000 to 2,850" F.
  • the sandwich structure mold after being preheated. is ready for pouringthe molten metal in the mold cavity. During the preheating and pouring of the metal, the sandwich structure mold does not gain sufficient additional strength to cause excessive hardening of the mold.
  • Another advantage of a sandwich structure mold is that, during the cooling process, the relatively thin inner layer 12 is able to collapse, thereby eliminating the possibility. of casting hot tears.
  • the mold is removed. lts construction permits the use of low amplitude mechanical vibration to crack the thin outer layer 16, which breaks off easily.
  • the intermediate layer being unbound, falls away from the mold and, if desired, may be reclaimed for re-use.
  • the portions of the inner layer are similarly easily broken away.
  • the castings resulting from this process are relatively free of mold materials, hot tears, and knock-out cracks. Also, sand blasting for final cleaning is minimized.
  • a method of producing a recyclable sandwich structure mold about a disposable pattern which is rc moved to define a mold cavity comprising the steps of:
  • steps (d) and (c) with in tervening drying to form an intermediate layer of said mold;
  • the method of claim 1 further including the step of volatilizing the organic fugitive binder to leave the intermediate layer unbound and sandwiched between said inner and outer layers.
  • organic fugi' tive binder is one of the group comprising vegetable gums. starches and polymeric latices.
  • the method of claim 1 further including the steps of heating said mold to remove said disposable pattern, to volatilize said organic fugitive binder in said intermediate layer, and to fuse said inorganic binder in said inner and outer layers.
  • step of removing the pattern is accomplished at a temperature within the range of 200 to 400 F.
  • step of volatilizing the organic fugitive binder is accomplished at a temperature within the range of l,00()F. to 2,850 F.
  • a sandwich structure recyclable mold for precision casting having a wall structure in cross-section comprising: i
  • a homogenous relatively thin inner layer consisting essentially of finely divided refractory material, including a high strength inorganic binder which is chemically inert to metals to be molded and granular refractory stucco;
  • an intermediate layer consisting essentially of finely divided refractory material, refractory stucco and an organic fugitive binder
  • organic fugitive binder is selected from the group comprising vegetable gums, starches, polymeric latices and polyvinyl alcohol.
  • a method of precision casting materials, such as metal alloys comprising the steps of:
  • step (f) includes the sub-steps of:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
US427732A 1973-12-26 1973-12-26 Sandwich structure mold Expired - Lifetime US3903950A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US427732A US3903950A (en) 1973-12-26 1973-12-26 Sandwich structure mold
GB50932/74A GB1486326A (en) 1973-12-26 1974-11-25 Sandwich structure monolithic mould
CA215,015A CA1039925A (fr) 1973-12-26 1974-12-02 Moule multicouches monolithique
DE19742459088 DE2459088C3 (de) 1973-12-26 1974-12-13 Monolithische Form für den Präzisionsguß mit verlorenem Modell
FR7441463A FR2255977B1 (fr) 1973-12-26 1974-12-17
JP49144586A JPS5223883B2 (fr) 1973-12-26 1974-12-18
SE7416046A SE420799B (sv) 1973-12-26 1974-12-19 En i materialhenseende ateranvendbar form av sandwichkonstruktion for precisionsgjutning
IT54755/74A IT1026158B (it) 1973-12-26 1974-12-24 Stampo monolitico per strutture sandwich e relativo metodo di produzione ed applicazione
BE151925A BE823853A (fr) 1973-12-26 1974-12-24 Moule monolithe de type sandwich

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427732A US3903950A (en) 1973-12-26 1973-12-26 Sandwich structure mold

Publications (1)

Publication Number Publication Date
US3903950A true US3903950A (en) 1975-09-09

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Application Number Title Priority Date Filing Date
US427732A Expired - Lifetime US3903950A (en) 1973-12-26 1973-12-26 Sandwich structure mold

Country Status (8)

Country Link
US (1) US3903950A (fr)
JP (1) JPS5223883B2 (fr)
BE (1) BE823853A (fr)
CA (1) CA1039925A (fr)
FR (1) FR2255977B1 (fr)
GB (1) GB1486326A (fr)
IT (1) IT1026158B (fr)
SE (1) SE420799B (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153432A1 (fr) * 1984-02-29 1985-09-04 Dentsply International, Inc. Stuc artificiel,procédé pour sa fabrication et son utilisation
US4689081A (en) * 1982-09-30 1987-08-25 Watts Claude H Investment casting method and stucco therefor
US4700768A (en) * 1983-12-14 1987-10-20 U.C.P.I. Societe Pour L'utilisation Des Ceramiques Et Des Platres Dans L'industrie Metal casting process using a lost pattern, moulds for performing this process and process for the production of said moulds
US4834165A (en) * 1987-08-03 1989-05-30 Ryobi Ltd. Collapsible core and method for producing the collapsible core feasible for high speed high pressure casting
US5297615A (en) * 1992-07-17 1994-03-29 Howmet Corporation Complaint investment casting mold and method
US5429796A (en) * 1990-12-11 1995-07-04 Howmet Corporation TiAl intermetallic articles
US5817897A (en) * 1994-03-15 1998-10-06 Itou; Nabhikhi Wax-like substance for use as a durable marking composition or in producing shaped articles for molding
US6920910B2 (en) * 2001-06-13 2005-07-26 Siemens Aktiengesellschaft Casting device, process for producing a casting device and method of using the casting device
US20150217366A1 (en) * 2012-10-09 2015-08-06 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150224569A1 (en) * 2012-10-09 2015-08-13 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150266085A1 (en) * 2012-10-09 2015-09-24 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150273571A1 (en) * 2012-10-09 2015-10-01 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150283601A1 (en) * 2012-10-09 2015-10-08 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20170100770A1 (en) * 2015-10-13 2017-04-13 Metal Casting Technology, Inc. Investment mold slurry curtain apparatus
WO2018071287A1 (fr) 2016-10-10 2018-04-19 3M Innovative Properties Company Procédé de fabrication d'un moule de moulage à la cire perdue
WO2018085560A1 (fr) 2016-11-03 2018-05-11 3M Innovative Properties Company Compositions de moulage à la cire perdue, moules, et procédés associés
WO2019016741A1 (fr) 2017-07-20 2019-01-24 3M Innovative Properties Company Compositions de moulage en cire perdue, moules, et procédés associés
CN113857423A (zh) * 2021-08-31 2021-12-31 宝鸡昆吾创新技术有限公司 一种铸造用粘接剂及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649917A1 (fr) * 1989-07-20 1991-01-25 Snecma Procede de fabrication de moules-carapaces pour fonderie
GB9601910D0 (en) * 1996-01-31 1996-04-03 Rolls Royce Plc A method of investment casting and a method of making an investment casting mould

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912729A (en) * 1956-07-24 1959-11-17 John M Webb Refractory molds
US3011986A (en) * 1958-09-12 1961-12-05 Howe Sound Co Dip coat composition for metal casting comprising ceramic flour, colloidal silica, gum, alkali metal fluoride and rubber latex
US3239897A (en) * 1963-09-20 1966-03-15 Howe Sound Co Precision casting mold and methods and materials for production and use
US3256574A (en) * 1965-03-22 1966-06-21 Howe Sound Co Mold and method of fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912729A (en) * 1956-07-24 1959-11-17 John M Webb Refractory molds
US3011986A (en) * 1958-09-12 1961-12-05 Howe Sound Co Dip coat composition for metal casting comprising ceramic flour, colloidal silica, gum, alkali metal fluoride and rubber latex
US3239897A (en) * 1963-09-20 1966-03-15 Howe Sound Co Precision casting mold and methods and materials for production and use
US3256574A (en) * 1965-03-22 1966-06-21 Howe Sound Co Mold and method of fabrication

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689081A (en) * 1982-09-30 1987-08-25 Watts Claude H Investment casting method and stucco therefor
US4700768A (en) * 1983-12-14 1987-10-20 U.C.P.I. Societe Pour L'utilisation Des Ceramiques Et Des Platres Dans L'industrie Metal casting process using a lost pattern, moulds for performing this process and process for the production of said moulds
EP0153432A1 (fr) * 1984-02-29 1985-09-04 Dentsply International, Inc. Stuc artificiel,procédé pour sa fabrication et son utilisation
US4834165A (en) * 1987-08-03 1989-05-30 Ryobi Ltd. Collapsible core and method for producing the collapsible core feasible for high speed high pressure casting
US5429796A (en) * 1990-12-11 1995-07-04 Howmet Corporation TiAl intermetallic articles
US5297615A (en) * 1992-07-17 1994-03-29 Howmet Corporation Complaint investment casting mold and method
US5817897A (en) * 1994-03-15 1998-10-06 Itou; Nabhikhi Wax-like substance for use as a durable marking composition or in producing shaped articles for molding
US6920910B2 (en) * 2001-06-13 2005-07-26 Siemens Aktiengesellschaft Casting device, process for producing a casting device and method of using the casting device
US20150266085A1 (en) * 2012-10-09 2015-09-24 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150224569A1 (en) * 2012-10-09 2015-08-13 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150217366A1 (en) * 2012-10-09 2015-08-06 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150273571A1 (en) * 2012-10-09 2015-10-01 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150283601A1 (en) * 2012-10-09 2015-10-08 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20170100770A1 (en) * 2015-10-13 2017-04-13 Metal Casting Technology, Inc. Investment mold slurry curtain apparatus
US11786961B2 (en) * 2015-10-13 2023-10-17 Metal Casting Technology, Inc. Investment mold slurry curtain apparatus
WO2018071287A1 (fr) 2016-10-10 2018-04-19 3M Innovative Properties Company Procédé de fabrication d'un moule de moulage à la cire perdue
US10953460B2 (en) 2016-10-10 2021-03-23 3M Innovative Properties Company Method of making investment casting mold
WO2018085560A1 (fr) 2016-11-03 2018-05-11 3M Innovative Properties Company Compositions de moulage à la cire perdue, moules, et procédés associés
WO2019016741A1 (fr) 2017-07-20 2019-01-24 3M Innovative Properties Company Compositions de moulage en cire perdue, moules, et procédés associés
CN113857423A (zh) * 2021-08-31 2021-12-31 宝鸡昆吾创新技术有限公司 一种铸造用粘接剂及其制备方法
CN113857423B (zh) * 2021-08-31 2023-09-08 宝鸡昆吾创新技术有限公司 一种铸造用粘接剂及其制备方法

Also Published As

Publication number Publication date
DE2459088A1 (de) 1975-07-03
JPS5223883B2 (fr) 1977-06-28
DE2459088B2 (de) 1976-02-19
JPS5097519A (fr) 1975-08-02
IT1026158B (it) 1978-09-20
BE823853A (fr) 1975-04-16
FR2255977A1 (fr) 1975-07-25
SE420799B (sv) 1981-11-02
SE7416046L (fr) 1975-06-27
GB1486326A (en) 1977-09-21
CA1039925A (fr) 1978-10-10
FR2255977B1 (fr) 1984-02-17

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AS Assignment

Owner name: HOWMET TURBINE COMPONENTS CORPORATION 825 THIRD AV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO AGREEMENT DATED DECEMBER 31, 1975.;ASSIGNOR:HOWMET CORPORATON A CORP. OF DE;REEL/FRAME:004164/0321

Effective date: 19830705

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