EP0747149A2 - Feingiessverfahren zur Erzeugung von Gegenständen mit sehr präziser Oberfläche - Google Patents

Feingiessverfahren zur Erzeugung von Gegenständen mit sehr präziser Oberfläche Download PDF

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Publication number
EP0747149A2
EP0747149A2 EP96304194A EP96304194A EP0747149A2 EP 0747149 A2 EP0747149 A2 EP 0747149A2 EP 96304194 A EP96304194 A EP 96304194A EP 96304194 A EP96304194 A EP 96304194A EP 0747149 A2 EP0747149 A2 EP 0747149A2
Authority
EP
European Patent Office
Prior art keywords
patterns
casting
pattern
investment
wax
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.)
Granted
Application number
EP96304194A
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English (en)
French (fr)
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EP0747149B1 (de
EP0747149A3 (de
Inventor
James Oti
David Lasalle
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.)
Johnson and Johnson Professional Inc
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Johnson and Johnson Professional Inc
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Filing date
Publication date
Application filed by Johnson and Johnson Professional Inc filed Critical Johnson and Johnson Professional Inc
Publication of EP0747149A2 publication Critical patent/EP0747149A2/de
Publication of EP0747149A3 publication Critical patent/EP0747149A3/de
Application granted granted Critical
Publication of EP0747149B1 publication Critical patent/EP0747149B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/04Use of lost patterns
    • B22C9/043Removing the consumable pattern
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C7/00Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02Lost patterns
    • B22C7/023Patterns made from expanded plastic materials

Definitions

  • the invention relates to methods for obtaining an improved surface finish on cast articles.
  • the invention is particularly applicable to investment casting processes that use patterns formed of photocurable polymers and moldable thermoplastics.
  • the wax tree is a solid wax tube that has side walls upon which a stem of the wax patterns is joined to form a cluster.
  • the cluster is coated with one or more coats of a refractory to form an investment assembly. After drying, the assembly is heated and fired and the solid wax patterns and the wax tree are extracted, yielding a shell. Molten metal is then pored into the shell so that it fills each of the cavities formerly occupied by the wax patterns and the wax tree. Upon cooling, the shell is fractured and removed, and the cast metal parts are severed from the metal tree.
  • Stereolithography involves the application of energy, such as UV radiation, to a photocurable liquid polymer. Exposure of selected regions of the polymer to the energy source causes curing and solidification of the polymer. Through these techniques, three dimensional parts can be constructed in a stepwise process.
  • Polymeric patterns prepared by a stereolithography process do not have as fine a surface finish as do wax patterns that are typically employed in investment casting processes.
  • Stereolithography-produced patterns are prone to surface imperfections, particularly on angular surfaces, when compared to conventional wax pattern materials used in precision investment casting.
  • the surface irregularities in the pattern may also be incorporated into the resulting ceramic mold. This will cause the surface irregularities present in the pattern to be carried over to the resulting cast articles.
  • Investment casting processes all require the application of some degree of heat to extract the heat disposable patterns from within the ceramic mold. In some instances the thermal expansion of the polymer can cause the ceramic mold to fracture.
  • Patterns formed by stereolithography may include hollow regions. It is possible for the refractory to seep into the hollow regions within a pattern and result in ceramic inclusions and/or voids being formed within the casting.
  • the use of photocurable polymers and moldable thermoplastics to form casting patterns provides certain advantages, such as by enabling relatively easy and time efficient manufacture of patterns.
  • the use of such materials to form casting patterns also presents drawbacks, such as a less fine surface finish on cast articles, the potential of mold cracking due to the higher thermal expansion of the polymeric patterns, and the possibility of introducing ceramic inclusions and/or voids in the casting due to the seepage of ceramic slurry into an interior, hollow portion of a pattern.
  • new techniques are necessary to enable the use of patterns formed by photocurable polymers and other polymers, while eliminating the drawbacks of using such materials to form casting patterns.
  • the present invention is directed to a casting method which utilizes casting patterns formed of a photocurable polymer or a moldable thermoplastic, while still obtaining cast articles having a smooth surface finish.
  • the casting process of the invention comprises the steps of first forming from a photocurable polymer or moldable thermoplastic one or more solid, heat disposable patterns of an article to be cast. Thereafter, a layer of a casting wax material, or a similar low melting compound, is applied to the patterns to coat the exterior surface of the patterns, thus yielding coated patterns. A ceramic shell is then built up around the coated patterns by applying one or more coatings of a refractory material to the patterns which, upon drying, forms an investment assembly.
  • the investment assembly is then subjected to heat at a first temperature range that is sufficient to melt and extract the layer of casting wax, but which is insufficient to melt or distort the patterns.
  • the investment assembly is then subjected to heating at a second temperature range that is sufficient to melt and extract the patterns, leaving a shell having one or more cavities.
  • the shell can then be fired to strengthen the shell and to burn off any residue remaining from the patterns or the layer of casting wax.
  • the shell is then filled with a molten casting material such that the molten casting material fills the cavities in the shell, forming, upon cooling, one or more cast articles.
  • the shell is then fractured and the cast articles are removed.
  • the casting process of the invention is advantageous because the resulting cast articles have an improved surface finish as compared to cast articles prepared by typically known processes using a casting pattern formed of a photocurable polymer or a moldable thermoplastic.
  • the present invention also enables hollow, or partially hollow, patterns to be used with a reduced risk that the refractory material will seep into interior portions of the pattern, thus creating ceramic inclusions and/or voids in the resulting cast article.
  • Figure 1 is a schematic view of a casting pattern.
  • Figure 2 is a schematic view of a casting pattern having a wax coating applied thereto according to the present invention.
  • Figure 3 is a schematic view of a cluster in which a plurality of casting patterns of the type shown in Figure 2 are assembled to a riser system.
  • Figure 4 is a schematic view of the cluster assembly of Figure 3, encased in a ceramic shell, forming an investment assembly.
  • FIG 5 is a schematic view of the investment assembly of Figure 4 in which the wax layer has been extracted from the investment assembly.
  • Figure 6 is a schematic view of a ceramic shell formed by extracting the casting patterns from the investment assembly shown in Figure 5.
  • Figure 7 is a flow chart illustrating the overall process of the present invention.
  • the invention provides a casting process that is better able to accommodate the use of casting patterns formed of photocurable polymers or moldable thermoplastics.
  • cast patterns formed of photocurable polymers and moldable thermoplastics offer many advantages, however, their use can also be disadvantageous as resulting cast articles may often have a lower quality surface finish. Mold cracking is possible due to higher thermal expansion of these polymeric materials, and the use of hollow patterns can result in seepage of refractory slurry into the pattern, generating ceramic inclusions and/or voids in the resulting cast articles.
  • the cast articles that result in the method of the present invention have a smooth surface finish, and the possibility of mold cracking, ceramic inclusion, and void formation in the cast article is minimized.
  • the present invention involves a casting process, such as known investment casting processes, modified to take advantage of and enhance the use of photocurable polymers and moldable thermoplastics used as casting patterns.
  • one or more casting patterns 10 are fabricated in a desired shape that corresponds to the shape desired of an article to be cast.
  • the exterior surfaces 12 of casting patterns 10 are then coated with a layer 14 of a wax material, such as a casting wax or a similar low melting material, to form a coated pattern 15.
  • typical casting procedures are followed. That is, a plurality of casting patterns 10 are assembled by their gate areas 16 to a riser system 18 to form a cluster 20, as shown in Figure 3.
  • the cluster is then coated with one or more layers 22 of a refractory material, while allowing drying between the sequential applications of the refractory. Following drying, an investment assembly 22 is formed which comprises cluster 20 encased in a ceramic shell 24.
  • the layer 14 of wax material is extracted without affecting patterns 10.
  • This procedure can be accomplished by subjecting the investment assembly to an elevated temperature at a first temperature range that is sufficient to melt the wax layer 12, but which is insufficient to melt or cause any significant thermal expansion of patterns 10.
  • the first temperature range preferably is about 70 to 220°F, and more preferably about 75 to 130°F.
  • This step can be conducted using procedures well known in the art to extract solid, heat disposable patterns from an investment assembly during an investment casting process.
  • Expansion gap 26 accommodates the thermal expansion of patterns 10 during subsequent heat extraction of these patterns.
  • the investment assembly 22 is subjected to an elevated temperature at a second temperature range that is sufficient to melt and extract casting patterns 10.
  • a second temperature range that is sufficient to melt and extract casting patterns 10.
  • the second temperature range should be sufficiently high to melt and extract the casting patterns 10, and thus the temperature range will depend to a large extent upon the physical properties of the polymer that is used to form pattern 10. Nevertheless, the second temperature range typically is from about 135 to 2000°F, and more preferably from about 1100 to 2000°F.
  • this heat extraction step can be conducted using procedures well known in the art to extract solid, heat disposable patterns during an investment casting process.
  • a ceramic mold 28, having a plurality of cavities 30, remains as shown in Figure 6. Mold 28 can then be heated and fired to impart increased strength to the mold, and to remove any residual polymeric matter used to form casting patterns 10. Mold 28 preferably is fired at a temperature in the range of about 1200°F to 2000°F for approximately 1/2 hour or more. The mold 28 is then ready to accept molten casting material, which is poured into the mold by techniques known in the art, to form solid, cast articles. After the cast articles solidify and cool, the ceramic shell 24, which forms mold 28, can be fractured and removed, by known techniques to recover the solid, cast articles.
  • the patterns used in the process of the invention can be formed by a variety of known photocurable polymers or moldable thermoplastics.
  • photocurable polymers can be used to form casting patterns through known stereolithography techniques in which a reservoir of a liquid, photocurable polymer is exposed, in selected regions, to an energy source, e.g., ultraviolet light, to cure (solidify) the polymer. Successive exposures of the polymer to the energy source in a defined pattern achieves a solid, three dimensional object of a desired shape.
  • Casting patterns can also be manufactured using moldable thermoplastics by a variety of known procedures, including injection molding and reaction injection molding.
  • photocurable chemicals are those that possess rapid curing properties when subjected to energy sources such as ultraviolet light.
  • energy sources such as ultraviolet light.
  • suitable liquid, photocurable polymers are that they be somewhat adhesive so that successive layers of a pattern to be formed will adhere to one another.
  • the viscosity of these materials should be low enough so that additional reactive photocurable polymer will flow across the surface of the partially formed object upon movement of the part being formed.
  • the liquid, photocurable polymer will absorb light (e.g., UV light) so that a reasonably thin layer of material is formed.
  • the polymer should also be soluble in a suitable solvent in its liquid state while being insoluble in the same solvent in its solid state. This enables the object to be washed free of remaining liquid, photocurable polymer once the object has been formed.
  • Useful reactive chemicals must also be heat destructible in their solid state.
  • Preferred materials are those that melt or destruct in the range of about 135 to 600°F or higher. This heat destructibility is essential as the objects formed through the stereolithography process are positive models of articles to be cast.
  • the models are encased in a ceramic forming binder material and once the binder solidifies, heat is applied to melt and extract the models leaving behind cavities that represent negative images of the articles to be cast.
  • An exemplary reactive chemical useful as a liquid, photocurable polymer to form a cast article is Potting Compound 363, a modified acrylate made by Locktite Corporation of Newington, Connecticut.
  • a process useful to make a typical UV curable material is described in U.S. Patent No. 4,100,141, which is hereby incorporated by reference.
  • Other examples of useful liquid, photocurable polymers are blends of epoxy resin and acrylate ester such as CIBATOOL ® SL5081-1, SL5131, SL5139, SL5149, SL5154, SL5170, SL5170, SL5177, SL5180, all of which are available from Ciba-Geigy Corporation, Tooling Systems, East Lansing, Michigan.
  • Other suitable photocurable polymers will be readily apparent to those of ordinary skill in the art.
  • thermoplastics can also be used to form the casting patterns. These materials include those that melt (and/or expand) in the range of about 175 to 625°F, or higher. Examples of such materials include polystyrene, polyethylene, nylons, ethyl cellulose, and cellulose acetate. These and other moldable thermoplastics are well known to those of ordinary skill in the art and are available from a variety of manufacturers.
  • Suitable photocurable polymers and moldable thermoplastics should also be able to be extracted from the mold by heating and/or flash firing in the range of about 1100°F to 2000°F to rapidly vaporize the solid polymer.
  • wax materials that are well known in the art and which are typically used in investment casting processes may be used to form the wax layer 14.
  • Suitable casting waxes tend to melt in the range of about 75 to 260°F, and more preferably from about 100 to about 175°F.
  • These waxes can include a variety of vegetable waxes, animal waxes, mineral and synthetic waxes, or mixtures thereof.
  • a variety of useful materials are well known in the art and are readily available from a variety of sources, including CERITA waxes available for Argueso & Company, Mamaroneck, New York.
  • the wax layer 14 can be applied to the casting patterns by a number of techniques, including spraying and dipping.
  • the wax layer 14 can also be formed by injecting the layer around the pattern.
  • the thickness of the wax layer 12 is slightly greater than the maximum anticipated expansion of the cast pattern.
  • the thickness of this wax layer is in the range of about 0.003 to 0.5 inch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
EP19960304194 1995-06-07 1996-06-06 Feingiessverfahren zur Erzeugung von Gegenständen mit sehr präziser Oberfläche Expired - Lifetime EP0747149B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48104995A 1995-06-07 1995-06-07
US481049 1995-06-07

Publications (3)

Publication Number Publication Date
EP0747149A2 true EP0747149A2 (de) 1996-12-11
EP0747149A3 EP0747149A3 (de) 1998-04-08
EP0747149B1 EP0747149B1 (de) 2000-08-23

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EP19960304194 Expired - Lifetime EP0747149B1 (de) 1995-06-07 1996-06-06 Feingiessverfahren zur Erzeugung von Gegenständen mit sehr präziser Oberfläche

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EP (1) EP0747149B1 (de)
JP (1) JP4059937B2 (de)
AU (1) AU708428B2 (de)
DE (1) DE69609898T2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151790A (zh) * 2010-02-11 2011-08-17 上海中洲特种合金材料有限公司 大铸件的熔模铸造方法
CN107685133A (zh) * 2017-09-12 2018-02-13 东方电气集团东方汽轮机有限公司 一种精密铸造用陶瓷型壳制备方法
CN110560636A (zh) * 2019-10-09 2019-12-13 西安皓森精铸有限公司 一种降低熔模铸造过程中型壳开裂的方法
CN110978874A (zh) * 2019-12-31 2020-04-10 中国美术学院 一种金属工艺品表面加工金属图文的工艺
CN112743043A (zh) * 2019-10-31 2021-05-04 波音公司 用于改进熔模铸件的表面光洁度的方法和系统
CN113102688A (zh) * 2021-03-29 2021-07-13 上海联泰科技股份有限公司 一种改善3d打印光敏树脂模在熔模铸造中胀壳的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1381481B1 (de) * 1999-10-26 2007-01-03 Howmet Research Corporation Mehrwandiger kern und verfahren
DE10260535A1 (de) * 2002-12-21 2004-07-08 Mtu Aero Engines Gmbh Verfahren zur Herstellung von aus Halbrohren oder Rohren bestehenden Wärmetauscherrohren für Rekuperativ-Abgaswärmetauscher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225980A1 (de) * 1982-07-10 1984-01-12 Fichtel & Sachs Ag, 8720 Schweinfurt Eingusssystem fuer wachs aus schmelz-verfahren
US4556528A (en) * 1983-06-16 1985-12-03 The Garrett Corporation Mold and method for casting of fragile and complex shapes
JPS6418546A (en) * 1987-07-10 1989-01-23 Morikawa Sangyo Sublimation pattern for producing casting
EP0649691A1 (de) * 1993-09-24 1995-04-26 Texas Instruments Incorporated Verfahren zur Herstellung eines Feingussmodells

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3426834A (en) * 1967-03-16 1969-02-11 Obermayer Co The S Expendable pattern for precision investment casting
DE3619170A1 (de) * 1986-06-06 1987-12-10 Basf Ag Verwendung von polystyrolschaumstoff als verlorenes modell bei der herstellung von metallgussteilen
JPS6422447A (en) * 1987-07-15 1989-01-25 Morikawa Sangyo Casting method for casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225980A1 (de) * 1982-07-10 1984-01-12 Fichtel & Sachs Ag, 8720 Schweinfurt Eingusssystem fuer wachs aus schmelz-verfahren
US4556528A (en) * 1983-06-16 1985-12-03 The Garrett Corporation Mold and method for casting of fragile and complex shapes
JPS6418546A (en) * 1987-07-10 1989-01-23 Morikawa Sangyo Sublimation pattern for producing casting
EP0649691A1 (de) * 1993-09-24 1995-04-26 Texas Instruments Incorporated Verfahren zur Herstellung eines Feingussmodells

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 193 (M-822), 9 May 1989 & JP 01 018546 A (MORIKAWA SANGYO KK), 23 January 1989, *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151790A (zh) * 2010-02-11 2011-08-17 上海中洲特种合金材料有限公司 大铸件的熔模铸造方法
CN102151790B (zh) * 2010-02-11 2013-09-11 上海中洲特种合金材料有限公司 大铸件的熔模铸造方法
CN107685133A (zh) * 2017-09-12 2018-02-13 东方电气集团东方汽轮机有限公司 一种精密铸造用陶瓷型壳制备方法
CN110560636A (zh) * 2019-10-09 2019-12-13 西安皓森精铸有限公司 一种降低熔模铸造过程中型壳开裂的方法
CN112743043A (zh) * 2019-10-31 2021-05-04 波音公司 用于改进熔模铸件的表面光洁度的方法和系统
CN112743043B (zh) * 2019-10-31 2024-06-04 波音公司 用于改进熔模铸件的表面光洁度的方法和系统
CN110978874A (zh) * 2019-12-31 2020-04-10 中国美术学院 一种金属工艺品表面加工金属图文的工艺
CN113102688A (zh) * 2021-03-29 2021-07-13 上海联泰科技股份有限公司 一种改善3d打印光敏树脂模在熔模铸造中胀壳的方法

Also Published As

Publication number Publication date
DE69609898D1 (de) 2000-09-28
EP0747149B1 (de) 2000-08-23
JP4059937B2 (ja) 2008-03-12
AU5459496A (en) 1996-12-19
DE69609898T2 (de) 2001-02-22
JPH09136140A (ja) 1997-05-27
AU708428B2 (en) 1999-08-05
EP0747149A3 (de) 1998-04-08

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