EP3600718A1 - Noyau de coulée et procédé de production s'y rapportant - Google Patents

Noyau de coulée et procédé de production s'y rapportant

Info

Publication number
EP3600718A1
EP3600718A1 EP18721843.3A EP18721843A EP3600718A1 EP 3600718 A1 EP3600718 A1 EP 3600718A1 EP 18721843 A EP18721843 A EP 18721843A EP 3600718 A1 EP3600718 A1 EP 3600718A1
Authority
EP
European Patent Office
Prior art keywords
casting core
segments
sub
casting
core
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
EP18721843.3A
Other languages
German (de)
English (en)
Other versions
EP3600718B1 (fr
Inventor
Matthias Baranzke
Ingo Staudt
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.)
Nemak SAB de CV
Original Assignee
Nemak SAB de CV
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 Nemak SAB de CV filed Critical Nemak SAB de CV
Publication of EP3600718A1 publication Critical patent/EP3600718A1/fr
Application granted granted Critical
Publication of EP3600718B1 publication Critical patent/EP3600718B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • B22C9/108—Installation of cores

Definitions

  • the invention relates to a casting core, which has the basic shape of a hollow body, wherein the casting core is formed from a molding material which consists of a mixture which is formed from a molding sand and a binder and optionally from additives added to adjust its properties.
  • the invention relates to a method for producing such a casting core.
  • Casting cores of the type in question are used for the casting production of castings from a molten metal.
  • the casting cores form cavities, such as channels or chambers. These cavities can be provided to save weight. As a rule, however, they are flowed through by a fluid in practical use.
  • the high-pressure mixture of molding materials mixed in the above-described manner is introduced into the forming cavity of a core shooting apparatus (" The fluidity of the molding material, the shooting pressure and the positions at which the molding material in the mold cavity intended for the production of the cores
  • the Machine is introduced, are tuned so that a Complete mold filling is achieved even with very finely divided cores.
  • the cores are solidified by exposure to heat or gassing with a reaction gas so that they can be removed from the core shooter and used in the respective casting mold, where they withstand the loads occurring during casting of the molten metal.
  • Typical examples of castings in which such channels and cavities are molded by means of casting cores are housings for drive machines, which must be cooled during operation.
  • cooling jackets are generally provided, that is, a system of passages surrounding the area of the machine in which heat is generated during operation as a result of energy turnover, thereby ensuring optimum flow through the critical areas of the machine and machine In this way, to ensure maximum cooling effect with small dimensions, the highest demands are placed on the quality of the surfaces of each of the casting core represented by the channels.
  • cores usually do not form a solid body, but are often broken so that their walls form finely dissected structures, the islands in which larger amounts of Core material are gathered, larger and thicker webs, finely branched webs, larger bridges and other filigree shaped
  • the invention has achieved this object by a casting core having at least the features specified in claim 1.
  • the invention should specify a method for producing such a casting core.
  • a casting core according to the invention which has the basic shape of a hollow body, wherein the casting core is formed from a molding material which consists of a mixture which is formed from a molding sand and a binder and optionally from additives added for adjusting its properties, is characterized according to the invention in that the casting core is divided into at least two subsegments and to the
  • Edge sides with which adjacent sub-segments abut each other, or in the vicinity of these edge sides mutually form-locking cooperating form elements are provided, via which the mutually adjacently arranged parts segments at least in one direction by positive engagement against each other
  • a casting core according to the invention is therefore not produced in one piece, but composed of two or more sub-segments. Since these individual segments themselves no longer define a cavity, they can be produced in the conventional core shooting process using simple core tools. Complex slide arrangements, as required for imaging hollow bodies, are not required for the production of the subsegments. At the same time, the inventively formed
  • Form fit are defined as projecting in the radial direction
  • Sub-segments positively against each other defining form elements allow, for example, a simple coupling of the sub-segments to the mold core surrounding the mold in the mold parts and cores, such as side cores, and thus a simple automatable assembly of the mold according to the invention.
  • openings can be made by subsequently inserted and with the surrounding material of the casting, for example, cohesively, e.g. sealed by gluing or welding, plugged or otherwise sealed with additional material, for example in a welding process.
  • the apertures formed by the projections may be used to overcast a possibly existing ridge which may be formed by molten metal which has penetrated into the joint between two colliding subsegments.
  • a suitable cutting tool such as a drill or cutter, are guided through the respective opening.
  • Divisional joints between the sub-segments can be formed shell-like in such a cylindrical tube-shaped casting core, the individual sub-segments. Equally, however, it may also be expedient to separate one or more subsegments from the other subsegments of the casting mold such that the relevant subsegments are annular. It goes without saying that such an annular configuration can also be advantageous for all subsegments of the casting mold if the shape of the casting core has a corresponding profile
  • a typical for the production of a cooling jacket of an electrically driven engine typical design of a
  • G thinkkerns invention is characterized in that the casting core is formed at least over a portion as meandering around the space bounded by the casting core space band.
  • the dividing joint between two adjacent subsegments may extend at least in sections in the longitudinal direction of the casting core or at least in sections in the circumferential direction of the casting core
  • G thinkkerns run.
  • a dividing joint can also change direction in its course, that is over a section in
  • the casting core has the shape of a hollow cylinder body, it has proved to be useful when the dividing plane between at least two mutually adjacent sub-segments extending from one to the other end face of the casting core.
  • Form fit are fixed, on the edge side of the first subsegment a projection and on the edge side of the second subsegment a
  • Recess is formed, which fills the projection of the first subsegment.
  • the recess may be designed, for example, as a wedge-shaped, cone-shaped or half-shell-shaped recess and the projection in cross-section corresponding wedge-shaped or semicircular or shaped as a cone. In this way, the to be coupled with each other
  • the core idea of the invention is thus to disassemble a complex-shaped, in its basic form a hollow body casting core into sub-segments that are easier to produce due to their spatially no longer closed shape, but at the same time in the casting core on suitably shaped form elements are set against each other, that a precise mapping of the respective castings in the casting cast in the casting cavities, channels and the like
  • the process according to the invention for producing a casting core according to the invention provides at least the following working steps: a) producing the sub-segments of the casting core, wherein the sub-segments are spatially separated from each other and physically independently formed from a molding material consisting of a molding sand and a binder and optionally added to adjust its properties additives;
  • Connection that is provided for each of the sub-segments each have their own shaping cavity in a core shooting machine.
  • this includes the possibility, which is important in practice, of forming the subsegments jointly and simultaneously in a core shooting box, in which a mold cavity is provided for each of the subsegments.
  • This variant of the method according to the invention enables a cost-effective and time-saving production in each case of a set of sub-segments, which can be assembled together to form a casting core according to the invention.
  • FIG. 1 shows a casting core in a perspective view from above
  • FIG. 2 shows a detail A of the casting core according to FIG. 1;
  • Fig. 3 the lower part of a core shooting box in plan view.
  • the casting core 1 has the basic shape of a cylindrical hollow body and accordingly delimits an interior IR which is located in Longitudinal direction LR extends from the lower end side SU to the upper end side SO of the casting core 1.
  • the molding core 1 which is made of a molded material which has been mixed in a manner known per se and made from a molding sand and an organic or inorganic binder, serves to image a cooling water jacket in a housing for an electric motor serving as a vehicle drive, which in another example not shown here Core package composite mold from a light metal melt, such as from a conventional aluminum casting material is poured.
  • the peripheral wall 2 of the casting core 1 is formed by a ring segment-like, around the longitudinal axis LX of the casting core 1 circumferential annular portion 3 and a meandering section 4.
  • an inlet opening performing projection 5 extends shaped like a band with a certain thickness
  • Ring section 3 over about three quarters of the circumference of the casting core. 1
  • the beginning of the meander section 4 is connected.
  • the turns 6 of the meandering section 4 are each placed so that its longitudinal sections 7 are axially parallel to the longitudinal axis LX.
  • the meandering section 4 extends from the end of the ring section 3 in the opposite direction of the ring section 3 to the inner space IR bounded by the casting core 1, until it reaches the beginning of the meandering section 4 with its end provided at the end of a longitudinal section T.
  • the protruding there radially outward projection 8 forms in the finished housing, the discharge opening of the casting core 1 to be formed by the water jacket.
  • the casting core 1 is divided into nine sub-segments 9 - 17. The first
  • Sub-segment 9 extends from the projection 5 over half the length of the ring portion 3.
  • the second sub-segment 10 occupies the second half of the ring portion 3 a.
  • the third to ninth sub-segments 11-17 each extend over about one seventh of the length of the
  • Meander section 4 wherein the ninth sub-segment 17 is longer by the leading to the end of the meander section 4 longitudinal section than the other sub-segments 11-16 of the meander section. 4
  • the division joints (of which in Fig. 1, the division joints 18 - 24 are visible), in which the sub-segments 9,10; 10.11; 11, 12; 12.13; 13; 14; 14; 15; 15-16; 16,17 abut each other, each extending in a first section 25 in the longitudinal direction LR and in an adjoining section 26 in the circumferential direction UR, wherein the included between the sections 25 and 26 angle may be not equal to 90 °, the orientation of the portion 25 so not only one component in the longitudinal direction LR, but also in the circumferential direction UR and the orientation of the portion 26 not only a component in the circumferential direction UR, but also in
  • Longitudinal LR may have.
  • Sub-segments 9-16 a shaped element 27a, 27b, 28a, 28b, 29a, 29b, 30a, 30b formed in the form of a radially outwardly projecting projection. Of the pairs 27a, 27b so formed at the dividing lines 18-24;
  • the one mold element 27a, 28a, 29a, 30a each have a recess 31 which extends over its projection length LV and which is shaped in the manner of a notch of corresponding shape in cross-section.
  • the mold elements 27a, 28a, 29a, 30a respectively associated with the mold elements 27b, 28b, 29b, 30b are accordingly wedge-shaped with a likewise dreittelnikförmigen cross section. In this way, fill the mold elements 27b, 28b, 29b, 30b respectively the recess 31 of the associated
  • Shaping elements 27a, 28a, 29a, 30a so that from shaped element pairs
  • protruding projections have a total circular cross-section.
  • a core shooting box is provided, of which the lower part 40 is shown in FIG. The one here
  • This assembly can be done before the cores 1 are placed in the respective mold, or
  • Sub-segments 9-17 can be assembled in the respective casting mold to the casting core 1 provided in it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

La présente invention concerne un noyau de coulée (1) revêtant la forme de base d'un corps creux, le noyau de coulée (1) étant moulé à partir d'une matière de moulage composée d'un mélange qui est moulé à partir d'un sable de moulage et d'un liant ainsi qu'éventuellement d'additifs ajoutés pour ajuster ses propriétés, et un procédé de production s'y rapportant. Selon l'invention, le noyau de coulée (1) est facile à produire. À cet effet, le noyau de coulée (1) est divisé en au moins deux segments partiels (9 - 17) et, au niveau des bords avec lesquels les segments partiels (9 - 17) placés adjacents les uns aux autres viennent en butée, ou à proximité desdits bords, des éléments de moulage (28a - 30b) coopérant les uns avec les autres par complémentarité de forme sont agencés, au moyen desquels les segments partiels (9 - 17) placés adjacents les uns aux autres sont fixés inamovibles les uns par rapport aux autres par la fermeture du moule au moins dans une direction (LR.UR).
EP18721843.3A 2017-03-29 2018-03-28 Noyau de coulée et procédé de production s'y rapportant Active EP3600718B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017106775.2A DE102017106775A1 (de) 2017-03-29 2017-03-29 Gießkern und Verfahren zu seiner Herstellung
PCT/IB2018/000316 WO2018178762A1 (fr) 2017-03-29 2018-03-28 Noyau de coulée et procédé de production s'y rapportant

Publications (2)

Publication Number Publication Date
EP3600718A1 true EP3600718A1 (fr) 2020-02-05
EP3600718B1 EP3600718B1 (fr) 2020-09-16

Family

ID=62104328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18721843.3A Active EP3600718B1 (fr) 2017-03-29 2018-03-28 Noyau de coulée et procédé de production s'y rapportant

Country Status (9)

Country Link
US (1) US10843255B2 (fr)
EP (1) EP3600718B1 (fr)
JP (1) JP6677862B1 (fr)
KR (1) KR102162930B1 (fr)
CN (1) CN110461499B (fr)
DE (1) DE102017106775A1 (fr)
MX (1) MX2019011689A (fr)
WO (1) WO2018178762A1 (fr)
ZA (1) ZA201906398B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017205853A1 (de) * 2017-04-06 2018-10-11 Bayerische Motoren Werke Aktiengesellschaft Kernpaket
LU502349B1 (de) 2022-06-24 2024-01-09 Nemak Sab De Cv Gießform zur Herstellung eines aus einer Leichtmetalllegierung gebildeten Gussteils

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093018A (en) * 1976-10-19 1978-06-06 Deere & Company Casting methods with composite molded core assembly
US5295530A (en) * 1992-02-18 1994-03-22 General Motors Corporation Single-cast, high-temperature, thin wall structures and methods of making the same
JP2003053478A (ja) * 2001-08-13 2003-02-26 Mitsubishi Heavy Ind Ltd 消失模型鋳造法
US7172012B1 (en) * 2004-07-14 2007-02-06 United Technologies Corporation Investment casting
US7438117B2 (en) * 2006-01-19 2008-10-21 Gm Global Technology Operations, Inc. Cylinder block casting bulkhead window formation
US20070221359A1 (en) * 2006-03-21 2007-09-27 United Technologies Corporation Methods and materials for attaching casting cores
GB2455560B (en) * 2007-12-14 2009-12-16 Rolls Royce Plc Core for casting
US8215372B2 (en) * 2008-10-17 2012-07-10 Brp Us Inc. Method and apparatus for consumable-pattern casting
US20110204205A1 (en) 2010-02-25 2011-08-25 Ahmed Kamel Casting core for turbine engine components and method of making the same
DE102010047952A1 (de) * 2010-10-08 2012-04-12 Continental Automotive Gmbh Verfahren zur Herstellung eines Gehäuses, insbesondere eines Gehäuses eines Turboladers
DE102010054496B4 (de) * 2010-12-14 2020-06-18 Volkswagen Ag Durch Gießen hergestelltes Elektromotorgehäuseteil für einen Elektromotor
JP2015044217A (ja) * 2013-08-28 2015-03-12 本田金属技術株式会社 中子成形装置
DE102014102724A1 (de) * 2013-12-03 2015-06-03 Nemak Linz Gmbh Verfahren zum gießtechnischen Erzeugen von Gussteilen aus einer Metallschmelze

Also Published As

Publication number Publication date
JP6677862B1 (ja) 2020-04-08
MX2019011689A (es) 2019-11-28
DE102017106775A1 (de) 2018-10-04
CN110461499B (zh) 2021-01-29
EP3600718B1 (fr) 2020-09-16
CN110461499A (zh) 2019-11-15
ZA201906398B (en) 2023-05-31
WO2018178762A1 (fr) 2018-10-04
US10843255B2 (en) 2020-11-24
KR20190128718A (ko) 2019-11-18
KR102162930B1 (ko) 2020-10-08
JP2020512937A (ja) 2020-04-30
US20200316677A1 (en) 2020-10-08

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