EP3600718B1 - Giesskern und verfahren zu seiner herstellung - Google Patents

Giesskern und verfahren zu seiner herstellung Download PDF

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Publication number
EP3600718B1
EP3600718B1 EP18721843.3A EP18721843A EP3600718B1 EP 3600718 B1 EP3600718 B1 EP 3600718B1 EP 18721843 A EP18721843 A EP 18721843A EP 3600718 B1 EP3600718 B1 EP 3600718B1
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EP
European Patent Office
Prior art keywords
sub
another
segments
foundry core
casting
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.)
Active
Application number
EP18721843.3A
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German (de)
English (en)
French (fr)
Other versions
EP3600718A1 (de
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
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Nemak SAB de CV
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Publication of EP3600718A1 publication Critical patent/EP3600718A1/de
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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
    • 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, the casting core being formed from a molding material which consists of a mixture formed from a molding sand and a binder and optionally from additives added to adjust its properties.
  • Casting cores of the type in question are used for the casting production of cast parts from a metal melt.
  • the casting cores form cavities, such as channels or chambers, in the respective cast part. These cavities can be provided to save weight. As a rule, however, a fluid flows through them in practical use.
  • the molding material mixture mixed in the manner explained above is introduced (“shot") into the molding cavity of a core-shooting device at high pressure.
  • the flowability of the molding material, the shooting pressure and the positions at which the molding material is introduced into the mold cavity of the machine provided for manufacturing the cores are coordinated so that complete mold filling is achieved even with particularly fine-grained cores.
  • the cores are solidified by applying heat or gassing with a reaction gas so that they are out removed from the core shooter and inserted into the respective casting mold, where they can withstand the stresses that occur when the molten metal is poured off.
  • Typical examples of cast parts in which such channels and cavities are molded using casting cores are housings for drive machines that have to be cooled during operation.
  • so-called "cooling jackets” are generally provided, i.e. a system of ducts that surround the area of the machine in which heat is generated during operation as a result of energy conversion.
  • cooling jackets are generally provided, i.e. a system of ducts that surround the area of the machine in which heat is generated during operation as a result of energy conversion.
  • casting cores of the type in question usually do not form a solid body, but are often perforated, so that their walls form finely divided structures, the islands, in which larger amounts of the Core material are gathered, larger and thicker webs, finely branched webs, larger bridges and other filigree shaped elements.
  • Due to the circumferentially closed basic shape of the casting cores, typically circular or ellipsoid in cross-section, with such finely divided casting cores demolding the cores from the core shooting machine is only possible with great effort.
  • Complex slide designs and the like must be provided in order to be able to separate the shaping components of the core shooting machine from the finished core despite the large number of undercuts and openings. Apart from the high costs that such a complex machine entails, this effort complicates the large-scale, rapidly clocked series production of casting cores of the type in question.
  • a casting core for the manufacture of a turbine blade is known.
  • This casting core is formed from a molding material that is mixed, for example, from ceramic particles and a suitable binder.
  • the casting core is composed of two subsegments, which have form elements that interact with each other in a form-fitting manner on those edge sides with which they abut, via which the adjacent part segments in two spatial directions, namely a direction normal to the outside of the segments and a transverse direction in the longitudinal direction of the segments aligned direction, are fixed immovably with respect to one another by positive locking.
  • a casting core which is composed of subsegments which are formed from a molding material and, when the casting core is assembled, are positively coupled to one another via interlocking projections and recesses formed on them.
  • the invention has achieved this object by a casting core which has at least the features specified in claim 1.
  • a casting core according to the invention which has the basic shape of a hollow body, the casting core being formed from a molding material which is composed of a mixture, which is formed from a molding sand and a binder and optionally from additives added to adjust its properties, is thus characterized according to the invention in that the casting core is divided into at least two sub-segments and on the edge sides, with which sub-segments arranged adjacent to one another abut, or in the vicinity of these edge sides with each other positively cooperating form elements are provided, by means of which the mutually adjacent part segments are fixed immovably against each other at least in one direction by a form fit.
  • a casting core according to the invention is therefore not made in one piece, but rather is composed of two or more subsegments. Since these individual segments themselves no longer define a cavity, they can be produced in the conventional core shooting process with simply designed core tools. Complex slide arrangements, such as those required for mapping hollow bodies, are not required to produce the subsegments. At the same time, the sub-segments formed according to the invention are also comparatively insensitive due to their limited spatial extent if they are designed in a filigree manner with many openings and the like. This allows the subsegments to be stored in an uncomplicated manner and transported for assembling the casting core. The assembly of the casting core according to the invention can be carried out in the course of the assembly of the entire casting mold in which it is to be used or at a point separated therefrom.
  • the form-fitting co-operating mold elements ensures, on the one hand, that the sub-segments find their correct position in a simple manner when assembling the casting core.
  • the form-fitting coupling ensures that that the subsegments maintain their position during the casting process even under the load of the melt that is poured into the casting mold and penetrates the casting core.
  • the secure hold of the subsegments can be supported by the fact that the subsegments are glued to one another in the area of the form elements that are positively coupled to one another.
  • the mold elements can couple the casting core according to the invention to the other casting cores or mold parts of the respective casting mold.
  • it can be expedient to form the shaped elements, via which the adjacent subsegments of a casting core according to the invention are fixed in relation to one another so as to be immovable in at least one direction, as projections protruding in the radial direction.
  • Form elements designed as projections in this way and securing the sub-segments positively against one another allow, for example, a simple coupling of the sub-segments to the molded parts and cores surrounding the casting core in the casting mold, such as side cores, and thus a simple, automatable assembly of the casting mold according to the invention.
  • the projections which are formed by the molded parts provided for the positive, mutual fixing of the partial segments, then form openings on the finished cast part, which lead to the cavities, channels, etc. depicted by the casting mold in the cast part.
  • These openings can be closed by plugs that are subsequently inserted and connected to the surrounding material of the cast part, for example cohesively, for example by gluing or welding, or closed in some other way with additional material, for example in a welding process.
  • the openings depicted by the projections can be used to overcast a possibly existing web, which can be formed by molten metal that has penetrated into the joint between two sub-segments that meet one another.
  • a suitable cutting tool such as a drill or milling cutter, can be passed through the respective opening.
  • the casting core has the basic shape of a hollow cylinder extending in a longitudinal direction with two end faces lying opposite one another in the longitudinal direction.
  • the individual subsegments can be shaped like a shell in the case of a casting core designed in the shape of a cylinder tube in this way.
  • a design of a casting core according to the invention is achieved in that the casting core is designed according to the invention at least over a section as a band running around the space delimited by the casting core.
  • the course of the dividing joint between the sub-segments of a casting core according to the invention is selected in accordance with the course and the arrangement of the structures that are provided in the area of its wall to create cavities, channels and the like in the cast part map.
  • the dividing joint can 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.
  • a dividing joint can also change direction in its course, that is to say extend over a section in the longitudinal direction of the casting core and over another section in the circumferential direction and so on.
  • the dividing plane extends between at least two mutually adjacent subsegments from one end to the other of the casting core.
  • the abutting sub-segments of a casting mold For the positive definition of the abutting sub-segments of a casting mold according to the invention, it has been found to be particularly suitable if the form elements via which the adjacent sub-segments are fixed in at least one direction non-displaceably by positive locking, on the edge side of the first sub-segment and on the edge side of the second sub-segment a recess is formed which fills the projection of the first sub-segment.
  • the recess can be designed, for example, as a wedge-shaped, conical-shaped or half-shell-shaped depression and the projection can be designed as a wedge-shaped or semicircular cross-section or shaped as a cone.
  • the core idea of the invention is therefore to split a complexly shaped casting core, which is a hollow body in its basic shape, into subsegments, which are easier to manufacture due to their spatially no longer closed shape, but at the same time in the casting core via suitably designed mold elements against each other are specified that a precise mapping of the cavities, channels and the like to be shaped by the casting core in the casting is guaranteed.
  • “Spatially separated” and “physically independent” in this context means that a separate shaping cavity is provided in a core shooting machine for each of the subsegments. This of course includes the possibility, which is important in practice, of shaping 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 of a respective set of subsegments which can be assembled together to form a casting core according to the invention.
  • the casting core 1 has the basic shape of a cylindrical hollow body and accordingly delimits an interior IR, which extends in the longitudinal direction LR from the lower end face SU to the upper end face SO of the casting core 1.
  • the peripheral wall 2 of the casting core 1 is formed by a ring segment-like ring section 3 that runs around the longitudinal axis LX of the casting core 1 and a meandering section 4.
  • the ring section 3 shaped like a band with a certain thickness, extends over approximately three quarters of the circumference of the casting core 1.
  • the beginning of the meander section 4 is connected to the end of the ring section 3.
  • the turns 6 of the meander section 4 are each placed such that its longitudinal sections 7 are axially parallel to the longitudinal axis LX.
  • the meander section 4 runs from the end of the ring section 3 in the opposite direction of the ring section 3 around the interior space IR delimited by the casting core 1 until it reaches the beginning of the meander section 4 with its end provided at the end of a longitudinal section 7 '.
  • the projection 8 protruding radially outward there forms the outflow opening of the water jacket to be formed by the casting core 1 in the finished housing.
  • the casting core 1 is divided into nine subsegments 9-17.
  • the first sub-segment 9 extends, starting from the projection 5, over half the length of the ring section 3.
  • the second sub-segment 10 occupies the second half of the ring section 3.
  • the third to ninth subsegments 11-17 each extend over approximately one seventh the length of the meander section 4, the ninth subsegment 17 being longer than the other subsegments 11-16 of the meander section 4 by the longitudinal section leading to the end of the meander section 4.
  • the dividing joints (of those in Fig. 1 the dividing joints 18-24 are visible), in which the subsegments 9,10; 10.11; 11.12; 12.13; 13; 14; 14; 15; 15.16; 16; 17 meet, each run in a first section 25 in the longitudinal direction LR and in an adjoining section 26 in the circumferential direction UR, the angle enclosed between the sections 25 and 26 being not equal to 90 °, i.e. the orientation of the section 25 not only one component in the longitudinal direction LR, but also in the circumferential direction UR and the alignment of the section 26 can have not only one component in the circumferential direction UR, but also in the longitudinal direction LR.
  • a shaped element 27a, 27b, 28a, 28b, 29a, 29b, 30a, 30b in the form of a radially outward direction is adjacent to the edge sides of the subsegments 9-16 that meet in the dividing joint 18-24 protruding projection formed.
  • pairs 27a, 27b; 28a, 28b; 29a, 29b; 30a, 30b of shaped elements 27a-30b have one Shaped element 27a, 28a, 29a, 30a each have a recess 31 which extends over its projection length LV and which is shaped like a notch with a cross section corresponding to a third of a circle.
  • the shaped elements 27b, 28b, 29b, 30b respectively assigned to the shaped elements 27a, 28a, 29a, 30a are accordingly wedge-shaped with a cross-section that is also third-circular.
  • the shaped elements 27b, 28b, 29b, 30b each fill the recess 31 of the associated shaped elements 27a, 28a, 29a, 30a, so that pairs of shaped elements 27a, 27b; 28a, 28b; 29a, 29b; 30a, 30b formed, radially outwardly projecting projections have an overall circular cross section.
  • the subsegments 9-17 are positively fixed to one another in the circumferential direction UR and in the longitudinal direction LR so that a relative movement in the circumferential direction UR and is prevented in the longitudinal direction LR on the lower face SU.
  • a core shooting box is provided, of which in Fig. 3 the lower part 40 is shown.
  • the core shooting box which is not shown here for the sake of clarity, is set up in such a way that the subsegments 9-17 for two toroidal cores 1 of the same type can be shot in it.
  • two sets of spatially separated mold cavities 49-57 are formed in the lower part 40 of the core shooting box and in the associated upper part of the core shooting box (not shown here) in a corresponding manner.
  • two sets of subsegments 9-17 can be shot in a manner known per se in this way. These are then combined to form two toroidal cores 1. This assembly can take place before the casting cores 1 are placed in the respective casting mold, or the Subsegments 9-17 can be assembled in the respective casting mold to form the casting core 1 provided in it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP18721843.3A 2017-03-29 2018-03-28 Giesskern und verfahren zu seiner herstellung Active EP3600718B1 (de)

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 (de) 2017-03-29 2018-03-28 Giesskern und verfahren zu seiner herstellung

Publications (2)

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

Family

ID=62104328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18721843.3A Active EP3600718B1 (de) 2017-03-29 2018-03-28 Giesskern und verfahren zu seiner herstellung

Country Status (9)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023248170A1 (de) 2022-06-24 2023-12-28 Nemak, S.A.B. De C.V. GIEßFORM ZUR HERSTELLUNG EINES AUS EINER LEICHTMETALLLEGIERUNG GEBILDETEN GUSSTEILS

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
CN118513507A (zh) * 2024-07-23 2024-08-20 宁波百易东和汽车部件有限公司 一种机壳模具及铸造方法

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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
WO2010044800A1 (en) 2008-10-17 2010-04-22 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

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023248170A1 (de) 2022-06-24 2023-12-28 Nemak, S.A.B. De C.V. GIEßFORM ZUR HERSTELLUNG EINES AUS EINER LEICHTMETALLLEGIERUNG GEBILDETEN GUSSTEILS
LU502349B1 (de) 2022-06-24 2024-01-09 Nemak Sab De Cv Gießform zur Herstellung eines aus einer Leichtmetalllegierung gebildeten Gussteils

Also Published As

Publication number Publication date
JP2020512937A (ja) 2020-04-30
DE102017106775A1 (de) 2018-10-04
JP6677862B1 (ja) 2020-04-08
US10843255B2 (en) 2020-11-24
WO2018178762A1 (de) 2018-10-04
CN110461499A (zh) 2019-11-15
KR20190128718A (ko) 2019-11-18
MX2019011689A (es) 2019-11-28
KR102162930B1 (ko) 2020-10-08
CN110461499B (zh) 2021-01-29
EP3600718A1 (de) 2020-02-05
ZA201906398B (en) 2023-05-31
US20200316677A1 (en) 2020-10-08

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