EP0904872A1 - Connexion des noyaux - Google Patents

Connexion des noyaux Download PDF

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Publication number
EP0904872A1
EP0904872A1 EP98112754A EP98112754A EP0904872A1 EP 0904872 A1 EP0904872 A1 EP 0904872A1 EP 98112754 A EP98112754 A EP 98112754A EP 98112754 A EP98112754 A EP 98112754A EP 0904872 A1 EP0904872 A1 EP 0904872A1
Authority
EP
European Patent Office
Prior art keywords
expansion element
cores
connection according
connection
expansion
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.)
Withdrawn
Application number
EP98112754A
Other languages
German (de)
English (en)
Inventor
Reiner Rommel
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.)
Hottinger Maschinenbau GmbH
Original Assignee
Hottinger Maschinenbau GmbH
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 Hottinger Maschinenbau GmbH filed Critical Hottinger Maschinenbau GmbH
Publication of EP0904872A1 publication Critical patent/EP0904872A1/fr
Withdrawn legal-status Critical Current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
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars

Definitions

  • the invention relates to a connection of cores a core package.
  • connection of such cores to core packages can by screwing the cores together using individual screws or tie rods. This is expensive since it is often has to be done manually. Also, the screws or Tie rods when gutting the castings or when Preparation of the molding material, the main component of which Sand (next to Binder) is to be rejected.
  • cores with hot or cold glue or with Both types of adhesive bonded together as a combination be, when connecting the cores with hot glue care must be taken that the subsequent Passing through a drying oven (for drying the water-based core size) the furnace temperature not above the melting temperature of the hot glue may lie. This would automatically loosen the adhesive bond to lead.
  • the invention has for its object a simple, nevertheless reliable connection of cores to one Core package while avoiding the aforementioned disadvantages create.
  • the stated object is achieved with a Connection of cores to a core package solved, which is characterized by recesses aligned with one another in the cores and an expansion element that can be plugged into them.
  • one of the recesses in a projection is one of the Cores is formed, in particular the expansion element is pin-shaped. Further training of these Embodiments provide that the expansion element in its lateral surfaces two opposite flats has and in particular with more than one expansion element the expansion elements for connecting two cores are aligned differently.
  • the metal expansion elements preferably Aluminum, plastic or wood
  • the sand as an essential component
  • the sand in particular has the same grain size as the Sand has cores and the expansion element has a higher one Binder content than the cores.
  • the expansion element two on both sides of a central area has extending annular approaches, in particular the outer jacket wall of the expansion element is double conical.
  • the invention provides for the possible approaches in a further preferred embodiment, that the approaches due to radially extending incisions in angular Sections are divided, in particular the incisions are angularly offset in relation to each other and the incisions extend to the central plane of the expansion element extend. This allows the expansion element also easy to manufacture.
  • the Lugs or sections protruding radially inwards have, in addition, the noses are angular extend only over part of the sections and / or the noses on a first approach to the noses on one second approach are angularly offset from each other.
  • connection of cores according to the invention is simplified the assembly of core packages considerably, since only expandable or spreading expansion elements or expansion dowels be inserted into the openings provided and with a single one under pressure or force Movement of the cores against each other - especially with Connection of more than two cores - to one core package be connected to each other.
  • Adhesive can be used when this is not the case, especially when using Spreading elements made of sand (with binder) a good reprocessing the cores possible after their use.
  • 1 shows two interconnected cores 1, 2 provided that together part of a core package, such as for example, an engine block core package.
  • the core 2 has a stepped recess 3 with it its end face 4 inwardly extending three Areas 6, 7, 8 on shoulders 9, 11 rejuvenate.
  • the core 1 has in the illustrated embodiment an approach 12, which in turn with a recess 13 is provided.
  • the recess 13 and the sections 6, 7 the recess 3 taper conically with a taper angle from about 3 to 5 °, the taper angle from 13 to 7 have different angles to each other must to strengthen the self-adhesive connection.
  • the diameter of the Section 8 a little less than 16 mm, i.e. at 15.8 to 15.9 mm.
  • the two cores 1, 2 are by an expansion element 14 connected to each other, which is also conical is, the taper of its in the recess 13th projecting section 16 also at about 3 to 5 ° accordingly that of the recess 13 is. To his the end facing away from section 16 expands Spreading element 14 with a taper of about 1 °.
  • the expansion element 14 has - in particular in its Area 16 - two opposite in its mantle area Flattenings 18 on.
  • the expansion element 14 can be made of wood or metal, such as Aluminum, exist; but it is preferably made of sand formed, in particular sand with the same Grain like the sand from which the cores 1, 2 are formed are, namely Kroning sand, although the binder or Resin content of the expansion element 14 over that of the cores 1, 2 lies, so that the expansion element 14 is an extreme maintains high strength. It is also possible to have special ones industrially manufactured croning cores as expansion elements h The high core strength as well as the good disintegration properties recommend their use for This task.
  • FIG. 3a and 3b are sufficient one end of a core part 1, two or three Recesses for the corresponding number of Spreading elements 14, although in principle also more Connection points can be provided.
  • the spreading elements 14 are preferably used so that their Flattenings 18 are oriented differently, so in Fig. 3a at a relative angle of 90 ° and 45 ° each to axes of symmetry of the core 1.
  • Fig. 3a are the upper expansion elements 14 in the same way designed while the flats of the lower Spreading element 14 at 45 ° to those of the upper spreading elements are aligned.
  • the expansion element 14 spreads in the areas in which it does not have the flat 18, the annular Projection 12 against the surrounding wall of the area 7 of the recess 3, so that between the two cores 1, 2 and the expansion element 14 in this area a fixed Traction is formed.
  • the expansion element 14 can in particular from an industrial robot or a manipulator be handled easily. Furthermore, through the Flattening 18, in the area of which when the Cores 1, 2 no radial forces are exerted, these in the areas where the flattening 18 does not exist is oriented and strengthened there. Hereby can, especially if - as this is preferably provided is - two or more connections of the described Type on mutually connecting end faces 4, 19 of the cores 2, 1 are present, the radial active forces in the desired way on these different compounds be aligned, especially so that they are not are rectified, but at finite angles are aligned with each other. Bags 6, 9 and 11 is a reservoir for any rubbed off during the joining process Provided sand.
  • FIG. 5 and 6 show another embodiment of the compound of the invention.
  • Cores 21, 22 of a core package to be created such as one Engine block core package, with adjacent end faces 23, 24 connected to each other.
  • recesses 26, 27 corresponding to cores 21, 22 provided, the recess 27 by two sections 28, 29 is formed, the one another via a step 31 pass over.
  • each of the recesses 26, 27 is a conical one Projection 32, 33 provided so that the recesses 26, 27 ring-shaped in their bottom regions 34, 36 are trained.
  • the jacket walls of the recesses 26, 27 run conically from the end faces 23, 24 tapering to the bottom areas 34, 36. They are on opposite sides with flats 18a - corresponding to the flats 18 of the expansion element Embodiment of Figures 1 to 4.
  • the expansion element of the embodiment of FIGS. 5 and 6 is to the recesses 26, 27 described above the cores 21, 22 adapted. It accordingly has one Middle area 38, from which extends in the axial direction annular projections 41 extend on both sides, which extend from the central area 38 to their outer wall free ends in a corresponding to the recesses 26, 27 Taper conically.
  • the approaches 39, 41 are through from their ends to the middle plane A of Spreading element 37 extending radial slots in angular sections divided as they are sections 39a, 39b, 39c of FIG. 4 can be removed. For the approach The same applies accordingly.
  • the lugs 39, 41 are also behind provided on the inside projecting lugs 43a, 43b, 43c, 44a, 44b, 44c, which only cover an angular section of the Sections 39a-39c of approach 39 or the corresponding Sections of the approach 41, in particular on the Half of the angular section of the sections mentioned, extend.
  • the expansion element is used to connect the core parts 21, 22 37 first into the recess of one of the cores 21, 22 used. Then the other core is put on.
  • the cores 23, 24 face each other with their end faces pressed, the sections 39a-39c and the corresponding sections of the other approach 41 due to a slight radial oversize of recesses 26, 29 and projections 32, 33 compared to those with these interacting wall parts of the expansion element 37 in unloaded state slightly pushed outwards and thus be placed under an elastic tension.
  • the expansion element 37 will also be used for further handling of the so formed core package reliable frictional connection between the cores 21, 22 by means of the expansion element 37 created.
  • the expansion element 37 is preferably made of plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Non-Reversible Transmitting Devices (AREA)
EP98112754A 1997-09-25 1998-07-09 Connexion des noyaux Withdrawn EP0904872A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997142276 DE19742276A1 (de) 1997-09-25 1997-09-25 Verbindung von Kernen
DE19742276 1997-09-25

Publications (1)

Publication Number Publication Date
EP0904872A1 true EP0904872A1 (fr) 1999-03-31

Family

ID=7843558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98112754A Withdrawn EP0904872A1 (fr) 1997-09-25 1998-07-09 Connexion des noyaux

Country Status (2)

Country Link
EP (1) EP0904872A1 (fr)
DE (2) DE19742276A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071282A1 (fr) * 1999-05-25 2000-11-30 Hottinger Maschinenbau Gmbh Dispositif pour l'assemblage de pieces de tout type
EP2340902A1 (fr) * 2009-12-15 2011-07-06 Rolls-Royce plc Moulage de caractéristiques internes dans un produit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103736969A (zh) * 2013-11-13 2014-04-23 江苏凯特汽车部件有限公司 一种汽车铝合金车轮铸造用模具附件
DE102015111418A1 (de) * 2015-07-14 2017-01-19 Nemak, S.A.B. De C.V. Verfahren zum Herstellen eines Gießkerns und Gießkern
DE102017205853A1 (de) 2017-04-06 2018-10-11 Bayerische Motoren Werke Aktiengesellschaft Kernpaket
CN111761025B (zh) * 2020-05-26 2022-07-12 洛阳中重铸锻有限责任公司 一种薄壁曲面铸钢件防变形铸造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083713A2 (fr) * 1982-01-07 1983-07-20 Klöckner-Humboldt-Deutz Aktiengesellschaft Procédé pour la fabrication d'un noyau de fonderie
FR2662218A1 (fr) * 1989-12-28 1991-11-22 Rapid Sa Goujon double pour l'assemblage jointif d'elements quelconques.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083713A2 (fr) * 1982-01-07 1983-07-20 Klöckner-Humboldt-Deutz Aktiengesellschaft Procédé pour la fabrication d'un noyau de fonderie
FR2662218A1 (fr) * 1989-12-28 1991-11-22 Rapid Sa Goujon double pour l'assemblage jointif d'elements quelconques.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071282A1 (fr) * 1999-05-25 2000-11-30 Hottinger Maschinenbau Gmbh Dispositif pour l'assemblage de pieces de tout type
US6588490B2 (en) 1999-05-25 2003-07-08 Reiner Rommel Foundry core assembly of interconnected cores
EP2340902A1 (fr) * 2009-12-15 2011-07-06 Rolls-Royce plc Moulage de caractéristiques internes dans un produit
US9038706B2 (en) 2009-12-15 2015-05-26 Rolls-Royce Plc Casting of internal features within a product

Also Published As

Publication number Publication date
DE29717661U1 (de) 1998-12-10
DE19742276A1 (de) 1999-04-01

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