EP0064411A1 - Procédé de moulage d'un objet d'une pièce constitué d'un corps de métal de base et d'un ou de plusieurs corps plus petits d'un autre matériau qui y sont ancrés - Google Patents

Procédé de moulage d'un objet d'une pièce constitué d'un corps de métal de base et d'un ou de plusieurs corps plus petits d'un autre matériau qui y sont ancrés Download PDF

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Publication number
EP0064411A1
EP0064411A1 EP82302288A EP82302288A EP0064411A1 EP 0064411 A1 EP0064411 A1 EP 0064411A1 EP 82302288 A EP82302288 A EP 82302288A EP 82302288 A EP82302288 A EP 82302288A EP 0064411 A1 EP0064411 A1 EP 0064411A1
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EP
European Patent Office
Prior art keywords
base metal
consumable material
inserts
smaller bodies
consumable
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.)
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Application number
EP82302288A
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German (de)
English (en)
Inventor
John Phin Oliver
Willard Edward Kemp
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Individual
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Individual
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Publication date
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Publication of EP0064411A1 publication Critical patent/EP0064411A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • 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
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools

Definitions

  • This invention relates to an improved method of forming a one piece article comprising a body of base metal having one or more smaller bodies of another material anchored thereto.
  • This invention has particular utility in the formation of articles having abrasive, wear resistant or corrosion resistant inserts embedded in or other smaller bodies thereof bonded to the working surface of the body of base metal.
  • inserts of a hard metal such as tungsten carbide
  • tungsten carbide are normally press-fitted into holes drilled at predetermined locations in the working surface of a steel body.
  • these inserts are often pulled loose from the base metal because they do not form a tight bond within the holes, particularly when they are of cylindrical shape to facilitate their being press-fitted into the holes.
  • drilling the holes in the base metal to receive them may involve complicated and expensive machining operations.
  • the primary object of this invention is to provide a method of forming a one piece article of this general type in which the smaller bodies are securely anchored to the body of base metal; and, more particularly, to provide a method of forming a drilling tool of the type described whose inserts are secured to the base metal by a metallurgical as well as a mechanical bond.
  • Another basic object is to provide such a method which does not require that holes be drilled in the body of base metal, or that other machining operations be performed thereon, preparatory to anchoring of the smaller bodies thereto, whereby the smaller bodies may be positioned on the body of base metal with a minimum of time and effort.
  • a further object is to provide such a method wherein the inserts may be of most any shape desired in order to fulfill the purposes of the article to be formed.
  • Still another object is to provide a method wherein smaller bodies of another metal may be cast in place on the body of base metal in such a manner that desired metallurgical effects may be obtained, and/or undesirable metallurgical effects avoided, in one or both of the metals during the casting.
  • a method comprising the steps of confining within a mold a pattern comprising a body of consumable material which conforms to the body of base metal of the article to be formed, and which has the smaller bodies of another material supported thereby in positions corresponding to those which they are to occupy with respect to the body when cast, and replacing the consumable material with molten base metal in order to cast said body of base metal and bond the particles in such positions about the surface thereof.
  • full mold casting as long as the metal is poured into an opening in the mold leading to the pattern at substantially the same rate the body of consumable material is consumed by its heat, the mold, which is usually unbonded sand packed about the pattern, will not collapse.
  • the smaller bodies are inserts of a hard, wear resistant metal, such as tungtsten carbide, which are embedded in the body of consumable material, and thus anchored to the body of base metal by one or both of a metallurgical and mechanical bond, whereby there is substantially less possibility of their being pulled loose, as during use as wear resistant or abrasive surfaces.
  • a hard, wear resistant metal such as tungtsten carbide
  • the only machining, or other preparation, required in the practice of the present invention is that necessary to enable the inserts to be supported by the body of consumable material; and if holes are preformed in the body of consumable material for this purpose, or if the inserts are molded in the place in the body of consumable material, the preparation is especially simple and inexpensive.
  • the consumable material is one which will be "consumed", as that term is used herein, without excessive residue when subjected to the molten metal. Furthermore, the residue which does occur is thought to actually enhance the atmosphere in which the materials are bonded.
  • the smaller bodies are of such composition as to maintain their integrity at the high temperature at which the base metal is poured.
  • the binder in tungsten carbide inserts may have a melting point substantially the same as or even lower than that of the base metal, the heat of the molten metal will not be instantly transmitted thereto.
  • the consumable material is conventionally a cellular plastic material which is sufficiently rigid to resist collapse under the weight of the sand. Although explanations vary as to the exact phenomenon which occurs, it is believed that the effluent from consumption of the consumable material aids in supporting the sand. Furthermore, the particular consumable material to be used may be selected to accomplish desired metallurgical purposes with respect to one or both of the metals. Thus, for example, inasmuch as polystyrene foam or other suitable consumable materials, have a high carbon content, they are believed to generate an atmosphere, as they are consumed, which enhances metallurgical bonding of the inserts to the body of base metal.
  • the mold is a flask which contains unbonded sand to which vacuum may be applied as the consumable material is replaced by the molten base metal.
  • the vacuum is not only useful in drawing off the gas from the combustion of the consumable material, and presumably in holding the sand in place, but also in holding the inserts in place, although, in accordance with the broader aspects of the present invention, it is contemplated that the inserts may be held in place in the absence of such a vacuum.
  • the inserts have inner ends which are of varying cross section along their lengths and thus more firmly anchored to the body of base metal when cast. Also, the inner ends of the inserts may be of non-circular cross section, and thus resist rotation as well as withdrawal from embedded position during use.
  • the shape of the inserts has no bearing on the casting process so that inserts of most any shape may be bonded to the base metal.
  • the unbonded sand or other pulverulent refractory material in the flask of the mold may work its way between time inserts and consumable material. Furthermore, if the exposed, outer ends of the inserts are first coated with a mold wash, which may be desirable to reduce oxidatiom of the insert upon removal from the mold, the particles of the wash may also enter the voids. As will be understood, any such interference with a tight fit between the inserts and body of consumable material will detract from bcnth the mechanical and metallurgical bond between them.
  • the inserts or other smaller bodies are formed of a material different than that of the body of base metal, there may be a tendency for the one or both of the materials to diffuse or migrate from one to the other during pouring. This is particularly true in the case of a material such as tungsten carbide which has a high carbon content as compared with a relatively low carbon steel from which the body of base metal may be formed. As a result, the insert material may be diluted to such an extent that it is very brittle or otherwise less suitable for wear-resistant purposes. This problem may be particularly ac:ute in the case of a drill bit due to the large mass of brase metal relative to that of the inserts.
  • Difficculty may also be encountered in supporting smaller bodies on the surface of the body of consumable material, rather than embedding them therein. This is particularly true when the smaller bodies are crushed particles or chips which are to be anchored in one or more layers to the surface of the base metal.
  • glues such as rubber ccement will evaporate in the presence of heat from the molten metal, and are thus consumable to permit the base metal to bond to the inserts, they are slow to dry and, unless dry, may permit the smaller bodies to move out of the positions which they are to occupy in the finished article.
  • the glue in order to support small bodies of crushed particle size or chips, the glue must be placed not only at the interface between the particles and body of consumable material (which of course requires proper orientation of the surface of the body of consumable material), but also between the particles themselves, and preferably over the particles so as to to submerge them. This of course is an even more time-consuming process since it may require the application of several layers of cement. Still further, as the cement drys, it may pull away from the particles so that they are more susceptible to being dislodged.
  • the sand When the pattern is confined within a mold comprising a flask containing unbonded sand, the sand must be sufficiently coarse to permit a vacuum to be applied thereto, as above described. Although the coarse sand is desirable from this standpoint, it may nevertheless be found to permit the formation of small protrusions of the base metal between the grains of sand. The resulting rough finish on the cast articles may for various reasons be highly undesirable.
  • Yet a further object of this invention is to provide a method of the character above described which deters diffusion of or migration between the materials from which the smaller bodies are made and the base metal, particularly in the forming of articles such as drill bits wherein the base metal is a low carbon steel and the smaller bodies are inserts of tungsten carbide or other wear-resistant material of high carbon content.
  • a still further object is to provide a method of the character above described in which the smaller bodies, and particularly one or more layers of particles of crushed tungsten carbide or the like, are so supported on the surface of the consumable material as to prevent their movement out of positions they are to occupy in the finished article.
  • Yet another object is to provide a method of the character above described wherein the pattern is confined within a mold comprising a flask containing a bed of unbonded sand which is of such construction that the resulting article has a relatively smooth outer surface, and yet wherein there is little or no interference with the application of vacuum to the sand.
  • the sheets cover not only the outer ends of the separation, but also the outer surfaces of the inserts, so as to not only exclude foreign matter from voids in the outer ends of the separations, but also enable the application of a mold wash prior to pouring of the molten base metal in order to reduce oxidation of the outer ends of the inserts.
  • the consumable material of which the sheets are formed preferably comprises a common, off the shelf, plastic tape having high carbon content.
  • the sheets create a high carbon atmosphere which enhances the metallurgical bond between small bodies and the base metal.
  • an adhesive side of the tape provides a convenient means for adhering it to the surface of the pattern without the need for applying cement thereto; and, when both sides of the tape are adhesive, the tape also provides a convenient means to which the smaller bodies may be applied prior to adhering of the tape to the surface of the body of consumable material.
  • migration or diffusion of the material of the smaller bodies and the body of base metal is deterred by quickly cooling the cast article, both during casting of the article and after the article is heat treated following casting, as is preferred.
  • the mold is a flask which contains unbonded sand or other pulverulent refractory material
  • such sand is "fluidized" just as soon as the desired metallurgical bond between the small bodies and base metal has been accomplished following the pour of the molded base metal.
  • air preferably in the form of an inert gas
  • air is caused to move upwardly through the unbonded sand to the extent necessary to cause the sand to act as a fluid, and thus to conduct heat quickly from casting through the sand, rather than to insulate the casting, as occurs when the unbonded sand is "solidified".
  • the unbonded sand may be again fluidized in order to transfer heat to the cast article for heat treating purposes, and then quickly cool the heat treated article. Casting and subsequent heat treating may, if desired, be practiced in different molds and then different beds of sand.
  • the smaller bodies are particles to be applied as one or more layers to the surface of the base metal, they may first be applied as a layer to one side of the sheet, as by means of a suitable cement. Even though the cement may not have dried, the sheet may be applied to the body of consumable material to support the particles in desired positions thereon. Thus, the sheet acts as a carrier or mat which may itself be adhered to the surface of the consumable material. In a further embodiment of the invention, still another sheet of consumable material will be applied over the first-mentioned sheet, and the outer edges thereof adhered to the surface of the body of consumable material.
  • the flask 10 and bed 11 of unbonded sand contained therein are of conventional construction well suited for use in the "full mold" casting process.
  • a means is provided for drawing a vacuum on the bed of sand within the flask.
  • the upper end of the flask is open to permit the sand to be packed around a pattern, and a means (not shown) may also be provided for vibrating the flask or otherwise assisting the same in compacting about the pattern.
  • the pattern 12 comprises a body 12A of consumable material having an external configuration which conforms to that of the body of base metal of the article to be formed.
  • the body of the article to be formed, and to which the body of consumable material conforms is a roller cone for a drill bit.
  • such an article is generally conical, and inserts 13 of tungsten carbide are embedded in its working surface in order to both break down the formation being drilled and increase the wear resistance of the bit. More particularly, these inserts are normally arranged in rows about the cone, with their outer ends protruding slightly from the outer surface of the body of base metal.
  • these inserts are initially embedded in and thus supported by the body of consumable material in positions corresponding to those which they are to occupy on the body of the cone. When so positioned, the inserts extend at different angles with respect to one another and with respect to the outer surface of the body of consumable material. As shown in Fig. 3A, the inner ends of inserts 13A may be provided with a circumferential groove into which base metal will flow in order to more securely anchor the inserts thereto. As shown in Fig.
  • inserts 13B have bell bottoms which are inserted into enlarged holes in the surface of consumable material, and another preformed body 14 of consumable material, which may be glue, is disposed between the insert and the hole, whereby the base metal which replaces the consumable materials will securely anchor the inserts in their preset positions.
  • the glue or other consumable material making up body 14 may be relatively dense, while the large body 12A thereof in which the holes are formed may be of low density, and thus more readily consumable.
  • the outer end of body 14 tapers inwardly toward the outwardly projecting end of insert 13B so that, when the base metal is cast, stress will be better distributed between the insert and the base metal, or stress between them will be eliminated.
  • the body 12A of consumable material is a cellular plastic material which is burned or vaporized, and thus in any event gasified, by the heat of a molten charge of base metal as the latter replaces it during the casting process.
  • polystyrene which is manufactured under the trademark "Styrofoam”
  • similar materials such as polyurethane and other thermoplastic, resinous materials such as polypropylene, cellulose, acetate, acrylate, may be used if desired.
  • a high carbon content material such as styrene foam may be desired because of the carbon rich atmosphere which it generates when heated.
  • a certain amount of residue resulting from gasification of the consumable material may actually enhance bonding.
  • such an atmosphere is believed to permit the formation of a metallurgical bond between the inserts and body of base metal without the eta phase often experienced when carbide is heated.
  • the availability of consumable materials having varying characteristics enables one to be selected in order to attain, or avoid, certain metallurgical results during casting.
  • cellular plastic materials are preferred not only because they are easily formed into complex shapes and leave little or no residue in the mold, but also because they are structurally strong, and thus not easily deformed when confined within the mold of unbonded sand. Still further, insofar as the present invention is concerned, although not easily deformable, such materials may nevertheless permit the inserts to be pressed into desired positions in the outer surface thereof.
  • the invention contemplates that the inserts may be molded with the body of consumable material in accordance with standard procedures. In either case, holes would not have to be formed on the surface of the body of consumable material to receive the inserts, and thus the inserts may be of most any shape.
  • the body 12A of consumable material may instead be hollow. Also, it may be of composite construction, with an inner core of relatively low density cellular plastic material so as to reduce the amount of gas, and with the inserts supported by a relatively high density cellular material on the outside of the inner core.
  • the inserts 13 are shown to be embedded and to protrude from the working surface of the body of consumable material, and thus from the cast body of base metal, the inserts may instead be flush with the surface, as in the case of modified inserts 13A, as well as in the case of inserts shown in Figs. 4A and 4B to be described hereinafter.
  • the inserts may be supported by the body of consumable material without being embedded - i.e., with their inner ends flush with the surface thereof, as shown in Fig. 5.
  • the inner ends of the inserts could be glued directly to the working surface, or otherwise supported thereon as will be described in connection with Fig. 5.
  • unbonded sand is preferred as the forming material of the mold
  • the mold may instead be made of bonded sand or other common foundry forming materials.
  • unbonded sand is easily packed around the pattern, as shown in Fig. 1, and is also susceptible to vibration in order to enhance its tight packing to form a smooth mold surface about the pattern, or to fluidizing in order to more easily position the article pattern therein or remove the cast article therefrom as well as to facilitate the heating and cooling thereof.
  • molten metal may be poured into an opening 15, commonly "known as a gate or filling tunnel, formed in the bed of unbonded sand and leading to the pattern.
  • an opening 15 commonly "known as a gate or filling tunnel
  • the molten metal is poured at substantially the same rate as the pattern is consumed so as to replace same.
  • the inserts are metallurgically bonded thereto, or mechanically bonded thereto, or both, in positions predetermined by their support on the surface of the pattern.
  • the cast article is the end product - i.e., in this case, a roller cone for a drill bit.
  • the invention contemplates, however, that the cast article may be an intermediate product - e.g., a strip of base metal in which the inserts are embedded as a one piece casting, and which may be wrapped around or otherwise fastened to a body to be protected from wear or to be used for cutting purposes.
  • the articles to be formed may, for example, be valves or valve parts, such as bodies, seats or closure members.
  • inserts of bronze, stainless steel, or the like may be supported upon a body of base metal so as to provide, when finish machined, a corrosion resistant as well as abrasion resistant sealing surface.
  • a cylindrical insert 20 of tungsten carbide or other suitable highly abrasive material is pressed into a similarly shaped hole 21 formed in the outer surface 22 of a body of consumable material.
  • the outer end of insert 20 is flush with the outer surface of the body of consumable material.
  • a sheet 23 of consumable material is applied to the outer surface of the body of consumable material so as to cover the separation between the insert 20 and the hole 21 which receives the insert so as to prevent grains of unbonded sand, or other fine particles of foreign material, from entering voids which might be present in the separation between the insert and the hole.
  • foreign material may comprise particles of a mold wash, which is preferably applied over the outer surface of the body of the consumable material, as indicated in broken lines in Fig. 4A, prior to the installation of the pattern within a bed of unbonded sand in the flask of the mold.
  • the sheet 23 also covers the outer end of the insert 20 so as to lessen any tendency for the tungsten carbide to be oxidized upon removal of the cast article from the mold.
  • the sheet 23 may be a commercially available tape of suitable plastic having adhesive on one or both sides. This not only provides a means by which the inner side of the tape may be applied to the outer surface of the body of consumable material, but also tends to hold the body of consumable material in place and prevent it from shrinking away from the insert as the pour begins.
  • the sheet contributes to the metallurgical bond between the insert and the base metal in that it further enhances the carbon atmosphere in which casting takes place as the consumable material is consumed.
  • the body of base metal is steel and the inserts are of a material such as tungsten carbide having a high carbon content. It has been observed that the sheet has a capillary affect in that the molten base metal has a tendency to fill the void which it leaves as it is consumed, even to the extent of forming a thin film or skin over the outer end of the insert.
  • the temperature of the cast article is so controlled as to reduce any tendency of the materials to migrate, but at the same time heat them to the extent necessary to obtain a good metallurgical bond between them.
  • this is accomplished by fluidization of the unbonded sand within the flask of the mold which causes the sand to act as a conductor and thereby transfer the heat from the article.
  • the body of sand may be subjected to a positive pressure, as by means of the introduction of air upwardly through the bottom of the flask to the extent necessary to cause it to act as a fluid, rather than a solid.
  • a positive pressure as by means of the introduction of air upwardly through the bottom of the flask to the extent necessary to cause it to act as a fluid, rather than a solid.
  • the article may be heat treated by the transfer of heat thereto through the fluidized bed of sand, and the heat then quickly dissipated therefrom, either in the same or another mold, to again prevent the excessive migration of the dissimilar materials.
  • the bed of relatively coarse sand within the flask which facilitates the application thereto of a vacuum, as described in connection with Fig. 1, is modified to the extent that that portion thereof immediately surrounding the pattern is instead formed of a relatively fine sand.
  • a one piece body of material 24, in the form of a strip of tungsten carbide or other highly abrasive material is applied to a sheet 25 of consumable material, which, similarly to the sheet 23, may be a plastic tape of any suitable commercially available type having one or both of its sides of adhesive.
  • the inner side of the strip 24 may be applied to one adhesive side of the tape 25, and the opposite side of the tape 25 then applied to the outer surface 26 of a body of consumable material so as to support the body 24 in a predetermined position on the outer surface of the body of consumable material.
  • the tape is of a type having adhesive on both sides, its inner side may merely be adhered to the outer surface of the body of consumable material for so supporting the body 24.
  • this embodiment of the present invention enables several such one piece bodies 24 to be applied in supported positions at desired locations about the outer surface of the body of consumable material.
  • the sheet 25 is of a highly carbonaceous material, it further enhances the high carbon atmosphere in which the casting of the body 24 to the body of base metal occurs on consumption of the body of consumable material.
  • a sheet 27 of consumable material which may also be commercially available adhesive plastic tape, is supported on a generally horizontal surface 28 so as to permit a layer of crushed particles or chips 29 to be spread evenly over its upper surface. Since the upper surface of the tape is adhesive, the particles will tend to remain adhered thereto for this reason alone, but, if desired, the particles may be pressed tightly against the upper adhesive side of the sheet.
  • a film 30 of cement is applied over the layer of particles 29 so as to fill the voids between them as well as to cover their upper sides.
  • the sheet 30 thus provides a mat or carrier for the particles 29 which may be applied to the outer surface 31 of a body of consumable material, as shown in Figs. 6C and 6D.
  • the upper surface of the film 30, as shown in Fig. 6B is applied directly to the outer surface of the body of consumable material, and the sheet 27 has overlapping edges 32 which are caused to adhere to the outer surface of the body of consumable material along the four edges of the film 30.
  • the mat may be so applied before the film 30 is dry, - i.e., as long as it is not so wet that it will run and thus cause the particles 29 to be displaced from their supported positions on the sheet 27.
  • the surface of the still wet glue of the film 30 will further enhance the support of the mat to the outer surface of the body of consumable material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Earth Drilling (AREA)
EP82302288A 1981-05-06 1982-05-05 Procédé de moulage d'un objet d'une pièce constitué d'un corps de métal de base et d'un ou de plusieurs corps plus petits d'un autre matériau qui y sont ancrés Withdrawn EP0064411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26091681A 1981-05-06 1981-05-06
US260916 1981-05-06

Publications (1)

Publication Number Publication Date
EP0064411A1 true EP0064411A1 (fr) 1982-11-10

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JP (1) JPS57187157A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138155A2 (fr) * 1983-10-07 1985-04-24 Kawasaki Jukogyo Kabushiki Kaisha Molette conique de trépan pour roches et son procédé de fabrication
US4715422A (en) * 1983-01-18 1987-12-29 Ae Plc Reinforcement of articles of cast metal or metal alloy
EP0421374A2 (fr) * 1989-10-05 1991-04-10 Deere & Company Procédé de fabrication d'articles en fonte avec couche superficielle résistante à l'usure et produit réalisé avec ce procédé
GB2246972A (en) * 1990-08-17 1992-02-19 William Lane Limited Method of producing a composite casting
WO1997007913A1 (fr) * 1995-08-24 1997-03-06 Bbl Brit Bit Limited Fabrication d'un foret
WO2010058074A3 (fr) * 2008-11-18 2010-08-05 Metso Minerals, Inc. Procédé pour la préparation d'un matériau composite et utilisation d'un matériau composite préparé par le procédé
CN101954457A (zh) * 2010-04-22 2011-01-26 广西钟山长城矿山机械厂 内外金属型覆砂铸造锰钢破碎壁或轧臼壁发热保温易割冒口的制造方法
CN108453243A (zh) * 2018-04-10 2018-08-28 昆明理工大学 一种陶瓷金属复合材料制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181443A (ja) * 1984-02-25 1985-09-17 徳山　祐司 釘付き鋳物インサ−ト

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Publication number Priority date Publication date Assignee Title
US2830343A (en) * 1956-04-26 1958-04-15 Harold F Shroyer Cavityless casting mold and method of making same
DE1433954B2 (de) * 1962-02-10 1971-02-18 Grunzweig & Hartmann AG, 6700 Lud wigshafen Verlorenes modell zur herstellung insbesondere dickwandi ger gusstuecke
US3635280A (en) * 1969-11-07 1972-01-18 John T Parsons Self-aligned multipart combustible casting pattern and method of making same
US3695340A (en) * 1970-05-04 1972-10-03 Parsons John T Multi-part combustible casting pattern having bend-resistant glue-less joints
DE7220947U (de) * 1972-10-05 A Laepple Gmbh & Co Gießmodell, insbesondere Vollformgießmodell

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7220947U (de) * 1972-10-05 A Laepple Gmbh & Co Gießmodell, insbesondere Vollformgießmodell
US2830343A (en) * 1956-04-26 1958-04-15 Harold F Shroyer Cavityless casting mold and method of making same
DE1433954B2 (de) * 1962-02-10 1971-02-18 Grunzweig & Hartmann AG, 6700 Lud wigshafen Verlorenes modell zur herstellung insbesondere dickwandi ger gusstuecke
US3635280A (en) * 1969-11-07 1972-01-18 John T Parsons Self-aligned multipart combustible casting pattern and method of making same
US3695340A (en) * 1970-05-04 1972-10-03 Parsons John T Multi-part combustible casting pattern having bend-resistant glue-less joints

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715422A (en) * 1983-01-18 1987-12-29 Ae Plc Reinforcement of articles of cast metal or metal alloy
EP0138155A2 (fr) * 1983-10-07 1985-04-24 Kawasaki Jukogyo Kabushiki Kaisha Molette conique de trépan pour roches et son procédé de fabrication
EP0138155A3 (en) * 1983-10-07 1986-10-08 Kawasaki Jukogyo Kabushiki Kaisha Rock bit cone and method of manufacturing the same
EP0421374A2 (fr) * 1989-10-05 1991-04-10 Deere & Company Procédé de fabrication d'articles en fonte avec couche superficielle résistante à l'usure et produit réalisé avec ce procédé
EP0421374A3 (en) * 1989-10-05 1992-04-29 Deere & Company Manufacturing process of casted articles with superficial wear resisting layer and product realised with the process
GB2246972A (en) * 1990-08-17 1992-02-19 William Lane Limited Method of producing a composite casting
WO1997007913A1 (fr) * 1995-08-24 1997-03-06 Bbl Brit Bit Limited Fabrication d'un foret
WO2010058074A3 (fr) * 2008-11-18 2010-08-05 Metso Minerals, Inc. Procédé pour la préparation d'un matériau composite et utilisation d'un matériau composite préparé par le procédé
CN101954457A (zh) * 2010-04-22 2011-01-26 广西钟山长城矿山机械厂 内外金属型覆砂铸造锰钢破碎壁或轧臼壁发热保温易割冒口的制造方法
CN101954457B (zh) * 2010-04-22 2011-11-16 广西长城矿山机械设备制造有限公司 内外金属型覆砂铸造锰钢破碎壁或轧臼壁发热保温易割冒口的制造方法
CN108453243A (zh) * 2018-04-10 2018-08-28 昆明理工大学 一种陶瓷金属复合材料制备方法

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