EP3810357B1 - Vorrichtung und verfahren zur entnahme mindestens eines kühlelementes aus einem wenigstens teilweise entformten gussteil, verfahren zur einbringung mindestens eines kühlelementes in einen formkern einer gussteilform, kühlelement sowie gussteil - Google Patents

Vorrichtung und verfahren zur entnahme mindestens eines kühlelementes aus einem wenigstens teilweise entformten gussteil, verfahren zur einbringung mindestens eines kühlelementes in einen formkern einer gussteilform, kühlelement sowie gussteil Download PDF

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Publication number
EP3810357B1
EP3810357B1 EP20722666.3A EP20722666A EP3810357B1 EP 3810357 B1 EP3810357 B1 EP 3810357B1 EP 20722666 A EP20722666 A EP 20722666A EP 3810357 B1 EP3810357 B1 EP 3810357B1
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EP
European Patent Office
Prior art keywords
cooling element
cast part
mould
removal
cooling
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
EP20722666.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3810357A1 (de
Inventor
Matthias Baranzke
Jochen Wilhelm
Gerald Dr. KLAUS
Thomas Weiser
Dirk Dr. SCHNUBEL
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
Priority to PL20722666T priority Critical patent/PL3810357T3/pl
Publication of EP3810357A1 publication Critical patent/EP3810357A1/de
Application granted granted Critical
Publication of EP3810357B1 publication Critical patent/EP3810357B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/04—Machines or apparatus for chill casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group

Definitions

  • the invention relates to a device for removing at least one cooling element from an at least partially demolded cast part, in particular from a cast housing formed from a light metal alloy for an electric motor, which has a device for removing the at least one cooling element.
  • the invention also relates to a method for removing at least one cooling element from an at least partially demolded casting, a method for introducing at least one cooling element into a mold core of a casting mold, a cooling element and a casting.
  • Another mold, which is provided with cooling elements, is off DE 10 2014 101 080 B3 known.
  • cooling irons made of gray cast iron or a free-cutting steel into a casting mold.
  • the cooling irons adhering to the cast part can be manually removed or removed and used again.
  • the present invention is based on the object of creating a device of the type mentioned at the outset which enables the at least one cooling element to be removed automatically.
  • the removal device comprises a means for gripping a removal projection attached to the at least one cooling element.
  • the removal device is preferably designed to be movable in order to remove the at least one cooling element from a cast part arranged in a stationary manner. It is also conceivable that a removal device is arranged in a stationary manner and a cast part for removing the cooling element is moved relative to a removal device. A manual removal of the cooling elements is advantageously not necessary. Furthermore, centering can advantageously be brought about by the removal device, which allows the at least one removed cooling element to be positioned in the same way at all times. This enables automated storage in a storage pallet for reuse.
  • a light metal alloy preferably an aluminum or magnesium alloy and are provided as a housing for an electric motor
  • special properties such as low porosity are found in areas that are used to accommodate a stator or a stator carrier and / or high strength is required.
  • the housing In order to enable a compact housing and reliable cooling during engine operation, the housing must have particularly low porosity, especially in the area of cooling ducts, in order to avoid loss of coolant.
  • it is necessary to introduce at least one cooling element into a mold core which can be a sand or salt core, for example, into a casting mold with which a casting is produced.
  • the casting mold can be a permanent mold such as a permanent mold or a sand mold intended for one-time use.
  • the removal projection is formed in one piece on the cooling element, connected to it in a materially bonded manner, or can be detachably connected to the cooling element. A particularly simple exchange of a removal projection is advantageously possible through a releasable connection. Any maintenance and / or repair work required is reduced.
  • the cooling element is preferably made of gray cast iron or a steel, in particular a free-cutting steel.
  • a cooling element has several removal projections. Should one of the removal projections be damaged, another can advantageously be used to remove the cooling element from the cast part. An immediate exchange is not necessary.
  • a one-piece molding advantageously enables simple production, while a material connection enables a damaged removal projection to be replaced or repaired by welding and soldering.
  • the gripping means expediently comprises at least one pair of rails which are spaced apart from one another and which are designed to grip behind the removal projection.
  • the removal projection can advantageously be gripped by a pair of rails in such a way that only removal forces are transmitted which preferably act perpendicularly or almost perpendicularly to a longitudinal direction of the rails. A transmission of transverse forces or bending moments, for example, which could damage the projection or the rails, is advantageously avoided.
  • the removal projection of the at least one cooling element comprises at least a pair of spaced apart rails which are designed to be gripped from behind by the gripping means.
  • the removal device is advantageously structurally simplified and thereby enables longer service lives.
  • the gripping means has several pairs of rails which are arranged next to one another in the circumferential direction of a rotationally symmetrical, preferably cylindrical or frustoconical removal head and in particular extend parallel or obliquely to its longitudinal axis.
  • a rotationally symmetrical, preferably cylindrical or frustoconical removal head can be beneficial several cooling elements can be removed at the same time in a single work step and centered when they are removed by the removal head.
  • the cooling elements are introduced into a rotationally symmetrical, preferably cylindrical or frustoconical mold core of a casting mold, which forms a cavity for receiving the rotor or a rotor carrier of the electric motor.
  • cooling elements which preferably form flush surface sections of a mold core and are in contact with a melt when a casting mold is being filled, each has a surface whose outer contour is almost identical to a functional inner contour section of a cavity of a casting from which the cooling element can be removed .
  • a near net shape production of a cast part is advantageously possible.
  • a particularly good fixation of the cooling elements in the mold core as well as their particularly good graspability when removing from the casting are achieved if a removal projection is arranged on a side of a cooling element that faces away from a side that is in contact with the when filling a casting mold Melt is.
  • the removal projection can on the one hand form a latching connection with the mold core and can also be gripped by the gripping means.
  • a mold core that is particularly suitable for the method according to the invention can be designed in one piece or in several parts, in particular in two parts. There is advantageously a particularly high degree of design freedom.
  • the at least one cooling element can be introduced into the mold core in such a way that a plurality of surface sections are formed, at least one of which is formed by an outside of the cooling element, it can be inserted into a mold core production tool before molding sand is introduced.
  • a stationary arrangement in the mold core production tool can be brought about by the removal projection, which for this purpose engages in a holding device in the tool. As a result, the fixed arrangement is ensured even when the molding sand is shot into the tool under pressure.
  • the removal projection advantageously acts for fixation in the mold core production tool and as a counter holder for a gripping means of a Device for removing at least one cooling element from an at least partially sanded cast part.
  • each pair of rails can engage behind an associated removal projection when the removal head moves in a straight line into the cavity.
  • Several cooling elements can advantageously be removed in one work step.
  • the cooling elements are also advantageously centered when they are removed. As a result, it is possible, in particular, to automatically insert it into a cooling iron storage pallet and to re-feed it for core production. A fully automated manufacturing process without manual intervention is possible.
  • each of the rails can be detachably connected to a rotationally symmetrical, preferably cylindrical or frustoconical removal head of the removal device or to the at least one cooling element. Damaged rails are advantageously easy to replace. Maintenance and / or repair work is reduced.
  • a diameter of a frustoconical removal head of the removal device increases in a direction in which the removal head can be moved into a casting cavity for removing cooling elements, and which is preferably coaxial with a longitudinal direction of the removal head. This enlargement causes the formation of a draft angle, which ensures that the forces required to remove cooling elements from a cast part are applied in a linearly increasing manner. Voltage peaks that could damage the removal head are advantageously avoided.
  • a removal projection of a cooling element has a T-shaped cross section and preferably extends in a longitudinal direction of the cooling iron.
  • T-legs can advantageously be gripped or gripped from behind by the gripping means, in particular by a pair of rails, in such a way that no transverse forces or bending moments occur that could damage the removal projection.
  • the thickness of the T-legs increases, preferably linearly, from a first end to a second end, in particular in the longitudinal direction of a cooling element, a linear movement of a removal head or that of the cast part relative to a stationary removal head with a gripping means that a Has a pair of rails for engaging behind the T-legs, are converted into a movement of the cooling elements with a movement component perpendicular to the direction of movement of the removal head.
  • a detachment of cooling elements from the cast part is advantageously effected.
  • a linear movement of the cast part or of the removal head can also advantageously be converted into a movement of the at least one cooling element in a different direction.
  • the rails which are preferably flat and have a constant thickness, slide along the T-legs for this purpose.
  • the removal head also has a draft angle, for example between 2 and 5 degrees, preferably 4 degrees, a particularly short path is required in combination with T-legs of varying thickness during a removal movement in order to apply a sufficiently high force to the at least one cooling element to be released from the casting, to be centered and finally to be taken along for removal from a casting cavity.
  • a draft angle for example between 2 and 5 degrees, preferably 4 degrees
  • a cast part wall section is formed in a cast part which, during casting production, rests with one side against the at least one cooling element and which has a secondary dendrite arm spacing between 3 and 30 ⁇ m, preferably between 15 and 25 ⁇ m.
  • a particularly high strength with low porosity is advantageously achieved.
  • a low porosity is particularly necessary when the cast part wall section delimits a cooling channel in which a liquid cooling medium is guided during engine operation.
  • a cast part comprises a groove which is provided for receiving a sealing ring, pores have a maximum diameter of 0.9 mm, preferably between 0.5 and 0.8 mm.
  • a particularly dense cast part can advantageously be produced. Loss of coolant during engine operation is prevented.
  • FIG. 1a Device (1) shown in a perspective illustration for removing eight identical metallic cooling irons (2) arranged in a circle next to one another from an in Fig. 1a Cast part, not shown, comprises a frustoconical, in Figures 1c-e
  • the removal device (1) comprises rails (8, 9) of constant thickness, which extend in the longitudinal direction of the removal head (3) and are formed from hardened steel ) are releasably connected. It is also conceivable that the rails (8, 9) have a varying thickness in their longitudinal direction.
  • the rails (8, 9) are tapered at both ends and are intended to support the removal projections (5) as in FIG Figure 1b shown in a plan view to reach behind from two opposite sides.
  • the removal head (3) of the removal device (1) is moved in the direction of an in Fig. 1a arrow (11) shown is moved parallel to its longitudinal axis into the casting, whereby a movement of the cooling iron (2) in the direction of in Figure 1b arrows (12) shown by way of example.
  • This will remove the chill irons (2) from an in Fig. 3
  • the cast part shown is loosened, centered and can be removed in the same work step.
  • An extraction device (1) is shown in detail in Figure 1c in a perspective view as well as in Fig. 1d shown in an exploded view.
  • the cooling iron (2a) shown in a perspective top view of an outer side has a curved surface (14), the outer contour of which is almost identical to a functional inner contour section of an in Fig. 3 with (23) designated cavity of a cast part (22) from which a cooling element (2a) can be removed.
  • the surface (14) is also intended to come into contact with a molten metal with which a casting mold is filled. This results in a particularly good casting quality, in particular high strength and low porosity in a casting area adjoining the cooling iron (2a). This can for example extend up to 25 mm away from the cooling iron (2a) and have a porosity with pores with a Feret diameter of a maximum of 0.8 mm.
  • a first projection (16) is integrally formed on a first end face (15), while two further projections (18, 19) are integrally formed on a second end face (17).
  • the projections (16, 19) are intended to be gripped from behind by a mold core into which the cooling iron (2b) is inserted. This achieves both a fixation in the mold core and a flush termination of a surface of the mold core with the curved surface (14) of the cooling iron (2a).
  • the cooling iron (2a) shown in a perspective view of an inside comprises a removal projection (5a) which has a T-shaped cross section and extends in the longitudinal direction of the cooling iron (2a).
  • a thickness of T-legs (7a) increases linearly from a first end (20) to a second end (21). This creates an inclined plane along the in Fig. 1 rails shown and designated (8, 9) during an insertion movement of a in Fig. 2 Removal device, not shown, slide in the direction of an arrow (11a).
  • a linear movement of the removal device is converted into a movement of the cooling irons (2a) with a radial directional component away from the cast part in the direction of in Figure 1b with (12) indicated arrows causes.
  • An in Fig. 3a Shown in a plan view, formed from an aluminum alloy housing (22) for an electric motor comprises a frustoconical cavity (23) with a surface line inclined by 1 degree with respect to the cone axis, which is intended to accommodate an in Fig. 3 not shown stator or a stator of the electric motor is provided.
  • a removal device (1b) for cooling irons (2b) is inserted into the cavity (23), the rails (8b, 9b) of which engage behind T-shaped removal projections (5b) of the cooling irons (2b) and which in Fig. 3a is in an initial position in which no extraction forces act on the cooling iron (2b).
  • Each cooling iron (2a) lies and adheres with an in Figures 2a and b with (14) designated surface against an associated cast part wall section (24).
  • the removal device (1b) is inserted into the cavity on a first side and emerges from the cavity (23) on a side facing away from the first side and takes the cooling iron (2b) with it. This advantageously prevents individual cooling irons (2b) from getting stuck when they are moved out in a direction of movement opposite to the insertion direction and from causing a standstill in an automated removal process.
  • FIG. 4a An in Figure 4a
  • the two-part, frustoconical sand core (26) shown in an exploded view and formed from a molding sand has two sand core parts (27, 28) which can be connected to one another and which can be connected to one another by a plug-in and adhesive connection by a ring-like projection (29) of a first mold core part ( 27) into an in Fig. 4 not shown, an adhesive having groove is inserted.
  • FIG. 4b A total of eight cooling irons (2c) are introduced into the assembled sand core (26) shown in a perspective view.
  • the surfaces of sand bars (34) are flush with the cooling iron surfaces (14c) and form a flat overall surface, which is intended to be in contact with a molten metal with which the casting mold is filled when a casting mold is being filled.
  • a cast part produced with such a core is manufactured near net shape.
  • FIG. 5a An in Figure 5a in a perspective view and in Figure 5b
  • the sand core (35) shown in a partially sectioned side view is formed in one piece. Cooling irons (2d) are used in an in Figure 5c Mold core production tool (36) shown in a sectional side view is introduced and shot in during core production, that is to say, hardenable molding sand flows around it until the mold is completely filled.
  • the mold core production tool (36) comprises an upper part (37) and a lower part (38) which enclose a space in which molding sand and cooling irons (2d) can be introduced for core production and which can be moved relative to one another in order to remove a produced mold core be able.
  • a top (14d) of the chill iron (2d) rests against a mold wall surface (39).
  • retaining recesses (40) are provided, into which retaining projections (5d) of the cooling irons (2d) engage, whereby a stationary arrangement in the mold core production tool (36) is ensured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Induction Machinery (AREA)
EP20722666.3A 2019-04-24 2020-04-23 Vorrichtung und verfahren zur entnahme mindestens eines kühlelementes aus einem wenigstens teilweise entformten gussteil, verfahren zur einbringung mindestens eines kühlelementes in einen formkern einer gussteilform, kühlelement sowie gussteil Active EP3810357B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL20722666T PL3810357T3 (pl) 2019-04-24 2020-04-23 Urządzenie zdejmujące i sposób zdejmowania co najmniej jednego elementu chłodzącego z co najmniej częściowo rozformowanego odlewu, sposób wprowadzania co najmniej jednego elementu chłodzącego do rdzenia formy odlewniczej, element chłodzący oraz odlew

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019110580.3A DE102019110580A1 (de) 2019-04-24 2019-04-24 Vorrichtung und Verfahren zur Entnahme mindestens eines Kühlelementes aus einem wenigstens teilweise entformten Gussteil, Verfahren zur Einbringung mindestens eines Kühlelementes in einen Formkern einer Gussteilform, Kühlelement sowie Gussteil
PCT/IB2020/053845 WO2020217199A1 (de) 2019-04-24 2020-04-23 Vorrichtung und verfahren zur entnahme mindestens eines kühlelementes aus einem wenigstens teilweise entformten gussteil, verfahren zur einbringung mindestens eines kühlelementes in einen formkern einer gussteilform, kühlelement sowie gussteil

Publications (2)

Publication Number Publication Date
EP3810357A1 EP3810357A1 (de) 2021-04-28
EP3810357B1 true EP3810357B1 (de) 2021-12-15

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Family Applications (1)

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EP20722666.3A Active EP3810357B1 (de) 2019-04-24 2020-04-23 Vorrichtung und verfahren zur entnahme mindestens eines kühlelementes aus einem wenigstens teilweise entformten gussteil, verfahren zur einbringung mindestens eines kühlelementes in einen formkern einer gussteilform, kühlelement sowie gussteil

Country Status (12)

Country Link
US (1) US20220203434A1 (zh)
EP (1) EP3810357B1 (zh)
JP (1) JP7421568B2 (zh)
KR (1) KR20210154819A (zh)
CN (1) CN114096363B (zh)
BR (1) BR112021020431A2 (zh)
CA (1) CA3137784C (zh)
DE (1) DE102019110580A1 (zh)
HU (1) HUE058311T2 (zh)
MX (1) MX2021012757A (zh)
PL (1) PL3810357T3 (zh)
WO (1) WO2020217199A1 (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

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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
DE102019110580A1 (de) 2020-10-29
CA3137784C (en) 2023-11-07
WO2020217199A1 (de) 2020-10-29
CN114096363B (zh) 2024-03-05
US20220203434A1 (en) 2022-06-30
BR112021020431A2 (pt) 2022-03-08
JP7421568B2 (ja) 2024-01-24
CA3137784A1 (en) 2020-10-29
HUE058311T2 (hu) 2022-07-28
KR20210154819A (ko) 2021-12-21
WO2020217199A9 (de) 2021-02-18
EP3810357A1 (de) 2021-04-28
JP2022529902A (ja) 2022-06-27
CN114096363A (zh) 2022-02-25
PL3810357T3 (pl) 2022-07-11
MX2021012757A (es) 2021-11-18

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