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EP3697554B1 - Moule de coulée sous pression pour la coulée de carters-cylindres ou de parties inférieures de carters de vilebrequin - Google Patents

Moule de coulée sous pression pour la coulée de carters-cylindres ou de parties inférieures de carters de vilebrequin Download PDF

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Publication number
EP3697554B1
EP3697554B1 EP18778378.2A EP18778378A EP3697554B1 EP 3697554 B1 EP3697554 B1 EP 3697554B1 EP 18778378 A EP18778378 A EP 18778378A EP 3697554 B1 EP3697554 B1 EP 3697554B1
Authority
EP
European Patent Office
Prior art keywords
crankcase
cylinder
die casting
casting
casting mold
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
EP18778378.2A
Other languages
German (de)
English (en)
Other versions
EP3697554A1 (fr
Inventor
Christian Klimesch
Steffen Ziegler
Horst Denndörfer
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.)
KS Huayu Alutech GmbH
Original Assignee
KS Huayu Alutech 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 KS Huayu Alutech GmbH filed Critical KS Huayu Alutech GmbH
Publication of EP3697554A1 publication Critical patent/EP3697554A1/fr
Application granted granted Critical
Publication of EP3697554B1 publication Critical patent/EP3697554B1/fr
Active 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
    • B22C9/22—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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2272—Sprue channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts

Definitions

  • the invention relates to a die casting mold for casting cylinder crankcases or crankcase lower parts, comprising a fixed mold part in which a sprue system for distributing the melt is at least partially formed, and movable mold parts in which a cavity for forming a cylinder crankcase or a crankcase lower part is at least partially formed.
  • Die casting molds for the production of cylinder crankcases or crankcase lower sections are well known, with the die casting process being used primarily in the field of light metal casting, especially aluminum alloys or magnesium alloys.
  • the molds used usually have a one- or two-sided gate onto the oil pan flanges or the parting surfaces between the cylinder crankcase and the crankcase lower section.
  • this has the consequence that a sufficiently low-porosity structure is often not achieved in the thick-walled areas during casting, as the required pressure often cannot be applied via the gate because the thinner areas in between solidify earlier. For this reason, additional squeezers are used below the bearing blocks in order to generate a sufficiently high holding pressure in the thick-walled areas.
  • a die casting mold with fixed and movable mold parts in which a sprue system is formed in a movable mold part, the gates of which extend through an intermediate mold part into a cavity of a cylinder crankcase to be cast on the cylinder walls.
  • the challenge therefore, is to provide a die-casting mold for casting cylinder crankcases or crankcase lower sections that can achieve a good microstructure in thick-walled areas of the castings without the need for additional squeezers.
  • the possible holding pressure should be increased compared to existing designs and handling during post-processing should be simplified.
  • an intermediate mold part between the stationary mold part and the movable mold parts, which at least partially defines the cavity for forming the cylinder crankcase or the crankcase lower section and in which the sprue system and several gates are at least partially formed, which open at the thick-walled areas of the cylinder crankcase or the crankcase lower section, wherein the gates are designed in a funnel shape and narrow towards the cavity, it is achieved that the thick-walled areas can be supplied directly with melt and the holding pressure can be introduced via the thick-walled areas so that the areas that solidify last can be supplied with melt throughout the entire solidification time. This connection compensates for shrinkage deficits during the solidification process and thus achieves a low-porosity structure even in these areas.
  • the funnel shape of the gates simplifies demolding and creates predetermined breaking points at the transition between the cavity or the casting and the runner system, ensuring a clean separation of the casting from the runner system when the mold is opened. This also improves the conditions for subsequent aging, quenching, and heat treatment, as the runner system is no longer present and therefore no energy can be drawn from it.
  • a first parting plane is formed between the fixed mold part and the intermediate mold part and a second parting plane is formed between the intermediate mold part and the movable side mold parts, which second parting plane is formed substantially parallel to a
  • the gates are arranged on the base surface of the cylinder block or crankcase lower section to be cast. This allows for easy demolding with a clean separation of the casting from the sprue. This allows for multiple gates to be created for a single cavity, especially in difficult-to-access positions within the cavity.
  • the sprue can be ejected between the stationary mold part and the intermediate mold part when the mold is opened, and the cylinder crankcase or the crankcase lower section can be ejected between the intermediate mold part and the movable mold parts when the mold is opened.
  • the tool used thus ensures easy separation when the plates are moved apart.
  • the die-casting mold can be filled from the crankcase side, and the gates open at the bearing block of the cylinder crankcase or the crankcase lower section. This allows the filling to be carried out directly onto the loaded and thick-walled bearing block, thereby achieving a low-porosity structure.
  • the die-casting mold can be filled from the cylinder deck side, and the gates open in the area of the tie rod cores of the cylinder crankcase, allowing filling below the water jacket core toward the bearing blocks or the tie rod cores. This allows these thick-walled areas to be produced with a low-porosity structure through the internal filling. This achieves a good structure in the area of the loaded tie rods.
  • the die casting mould can preferably be filled from the cylinder top side and the gates open in the area of the Cylinder walls of the cylinder crankcase, so that improved structures are achieved through the increased pressure to be applied.
  • two gates are formed on each bearing block, which are arranged on both sides of each bearing shell receptacle of the cylinder crankcase or the crankcase lower part, so that a filling on both sides of the bearing block is produced, which leads to a uniform structure of the bearing block area regardless of the casting layer.
  • a main pouring runner is formed between the stationary mold part and the intermediate mold part.
  • This main pouring runner extends along the length of the mold parts. From this runner, several individual pouring runners extend perpendicular to the main pouring runner on both sides through the intermediate mold part to the cavity.
  • This design achieves uniform and low-turbulence filling with constant holding pressure. This results in a uniform distribution of the melt and a uniform feeding into the bearing seats.
  • a projected area of the sprue system arranged in the intermediate mold part onto the second parting plane between the movable mold part and the intermediate mold part is arranged within a projected area of the cavity onto this parting plane.
  • the individual casting runners have a diameter that essentially corresponds to the width of the bearing block. This large diameter allows the holding pressure from the piston system to act for a significantly longer period during the solidification phase.
  • the die casting mold according to the invention is therefore particularly suitable for producing cylinder crankcases and crankcase lower sections with high strength by achieving low-porosity structures in highly stressed, thick-walled areas without the need for additional squeezers. Higher final pressures are possible due to the reduced blast area, and the amount of recycle material is reduced during demolding due to the small sprue system.
  • the Figure 1 shows schematically a side view of a die casting mold according to the invention with a crank chamber-side sprue system in the closed state in a sectional view.
  • the Figure 2 schematically a side view of the die casting mold according to the invention Figure 1 in the opened state in a sectional view.
  • the Figure 3 shows schematically the cast cylinder crankcase with the crankcase side gating system in perspective view.
  • the Figure 4 shows schematically a side view of an alternative die casting mold according to the invention with a cylinder cover-side sprue system in the closed state in a sectional view.
  • the die casting mold according to the invention shown in the figures has a fixed mold part 10, via which the melt is introduced into the die casting mold.
  • This fixed mold part 10 is attached to a machine plate (not shown), which is provided with a casting chamber and the casting piston for generating the pressure, whereby the casting piston presses the melt through the fixed machine plate and into the fixed mold part 10.
  • a main casting runner 12 is formed between the stationary mold part 10 and an intermediate mold part 14.
  • a first parting plane 16 is formed between the intermediate mold part 14 and the stationary mold part 10, at which the two mold parts 10, 14 rest on one another and are pressed together during casting, and at which the two mold parts 10, 14 are separated from one another after casting.
  • the cavity 20 has the shape of a cylinder crankcase 34 with three cylinders 36, whose inner cylinder walls 38 are formed by the molds 30 used, and whose cylinder deck 39 and the outside of the cylinder crankcase 34 are formed by the movable mold parts 28, 29.
  • a crank chamber 40 is delimited by the intermediate mold part 14, with the gates 22 each opening into thick-walled regions 42 of the cylinder crankcase 34, which in the present embodiment are formed by bearing blocks 44 of the cylinder crankcase 34.
  • Tie rod cores 46 extend from the cylinder deck 39 into the cylinder crankcase.
  • Each of the four bearing blocks 44 is fed with melt via a pair of individual pouring runners 18, with the gates 22 being arranged on either side of bearing shell receptacles 48.
  • the pressure generated during the die-casting process acts exclusively on a projected surface of the cylinder crankcase 34 or the cavity 20 on the second parting plane 32 between the intermediate mold part 14 and the movable side mold parts 29, since the entire casting run on the intermediate mold part 14 or the projected area of the sprue system 26 within this projected area acts on the base area or the second parting plane 32. Accordingly, a very high holding pressure can be introduced or, compared to known embodiments, the closing force on the die casting mold can be reduced.
  • the die casting mold is opened at both parting lines. Due to their smallest cross-section, the individual runners 18 break off in the area of the gates 22, so that an entire solidified sprue 50 is ejected between the stationary mold part 10 and the intermediate mold part 14.
  • the cylinder crankcase 34 is ejected via ejector 52 after the molds 30 have been withdrawn from the movable mold part 10 and between the movable mold part 10 and the intermediate mold part 14, ensuring a clean separation between the casting and the sprue 50.
  • FIG. 4 An alternative possibility for casting a cylinder crankcase 34 is shown. In this case, filling does not take place on the crankcase side, but on the cylinder cover side.
  • a part of the sprue system 26 is again formed, which continues in the intermediate mold part 14.
  • This likewise has eight individual runners 18, which extend in a plane between the cylinders 36 to an area in which the tie rod cores 46 are arranged and from there fill the thick-walled area 42.
  • the individual runners could also extend through the parts of the intermediate mold part 14 forming the cylinders 36 and there, from the inside, via the crankcase-side end of the cylinder walls 38, in turn fill the thick-walled areas of the bearing blocks 44.
  • the cavity 20 is also formed in this embodiment between the intermediate mold part 14, the movable side mold parts 29 and the movable mold part 28, wherein the mold part 28
  • the side mold parts 29 form the cylinder outer surfaces and the outer surface of the crankcase 40.
  • the cylinder deck is formed by the intermediate mold part 14.
  • the pressing and feeding also take place directly on the thick-walled areas 42 of the cylinder crankcase, which are most subject to shrinkage, so that a low-pore structure can be achieved here as well.
  • the sprue 50 is also separated from the casting by simply opening the die-casting mold.
  • Such a die casting mold opens up various possibilities for filling and feeding the relevant thick-walled areas of a casting, and in particular of a cylinder crankcase, so that a low-porosity structure can be achieved.
  • this filling and feeding can take place at high pressures, since the small sprue system keeps the mold's burst area very small.
  • the cross-sections of the individual runners or the entire sprue system can be made relatively large, allowing the applied holding pressure to act for a long time. This also leads to improved structures in the relevant areas of the bearing block or the tie rods. Since the sprue is also very small, the amount of recycled material is reduced, which can save energy. In addition, the necessary post-processing is reduced, since the sprue automatically detaches from the casting at the correct position when the mold is opened.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (10)

  1. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin, comprenant
    une pièce moulée fixe (10) dans laquelle est réalisé au moins en partie un système d'injection (26) pour répartir la masse fondue,
    des pièces moulées mobiles (28, 29) dans lesquelles est réalisée au moins en partie une cavité (20) pour former un carter de vilebrequin cylindrique (34) ou une partie inférieure de carter de vilebrequin,
    caractérisé en ce que
    entre la pièce moulée fixe (10) et les pièces moulées mobiles (28, 29) est disposée une pièce moulée intermédiaire (14) qui délimite au moins en partie la cavité (20) pour former le carter de vilebrequin cylindrique (34) ou la partie inférieure de carter de vilebrequin et dans laquelle sont réalisés au moins en partie le système d'injection (26) et plusieurs entailles (22) qui débouchent sur des zones à paroi épaisse (42) du carter de vilebrequin cylindrique (34) ou de la partie inférieure de carter de vilebrequin, les entailles (22) étant réalisées de manière à se rétrécir en forme d'entonnoir vers la cavité (20).
  2. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon la revendication 1,
    caractérisé en ce que
    entre la pièce moulée fixe (10) et la pièce moulée intermédiaire (14) est réalisé un premier plan de séparation (16) et entre la pièce moulée intermédiaire (14) et les pièces moulées latérales mobiles (29) est réalisé un deuxième plan de séparation (32) qui sont disposés sensiblement parallèlement à une surface de base (17) du carter de vilebrequin cylindrique (34) à couler ou de la partie inférieure de carter de vilebrequin à couler.
  3. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon la revendication 1 ou 2,
    caractérisé en ce que
    entre la pièce moulée fixe (10) et la pièce moulée intermédiaire (14), lors de l'ouverture du moule de coulée sous pression, la carotte (50) peut être éjectée et entre la pièce moulée intermédiaire (14) et les pièces moulées mobiles (28, 29), lors de l'ouverture du moule de coulée sous pression, le carter de vilebrequin cylindrique (34) ou la partie inférieure de carter de vilebrequin peut être éjecté.
  4. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que le moule de coulée sous pression peut être rempli du côté de l'espace de vilebrequin et les entailles (22) débouchent au niveau du coussinet de palier (44) du carter de vilebrequin cylindrique (34) ou de la partie inférieure de carter de vilebrequin.
  5. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le moule de coulée sous pression peut être rempli du côté du couvercle de cylindre et les entailles (22) débouchent dans la région des noyaux de tirant d'ancrage (46) du carter de vilebrequin cylindrique (34).
  6. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le moule de coulée sous pression peut être rempli du côté du couvercle de cylindre et les entailles (22) débouchent dans la région de parois de cylindre (38) du carter de vilebrequin cylindrique (34).
  7. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon la revendication 4,
    caractérisé en ce que
    au niveau de chaque coussinet de palier (44) sont réalisées deux entailles (2) qui sont disposées des deux côtés de chaque logement de coque de palier (48) du carter de vilebrequin cylindrique (34) ou de la partie inférieure de carter de vilebrequin.
  8. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    entre la pièce moulée fixe (10) et la pièce moulée intermédiaire (14) est réalisé un canal de coulée principal (12) qui s'étend le long de la longueur des pièces moulées (10, 14, 28) et à partir duquel s'étendent des deux côtés plusieurs canaux de coulée individuels (18) s'étendant perpendiculairement au canal de coulée principal (12) à travers la pièce moulée intermédiaire (14) jusqu'à la cavité (20).
  9. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    une surface projetée du système d'injection (26) disposé dans la pièce moulée intermédiaire (13) sur le deuxième plan de séparation (32) est disposée à l'intérieur d'une surface projetée de la cavité (20) sur le deuxième plan de séparation (32).
  10. Moule de coulée sous pression pour couler des carters de vilebrequin cylindriques ou des parties inférieures de carter de vilebrequin selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les canaux de coulée individuels (18) présentent un diamètre qui correspond sensiblement à la largeur du coussinet de palier (44).
EP18778378.2A 2017-10-17 2018-09-10 Moule de coulée sous pression pour la coulée de carters-cylindres ou de parties inférieures de carters de vilebrequin Active EP3697554B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017124150.7A DE102017124150B4 (de) 2017-10-17 2017-10-17 Druckgussform zum Gießen von Zylinderkurbelgehäusen oder Kurbelgehäuseunterteilen
PCT/EP2018/074310 WO2019076536A1 (fr) 2017-10-17 2018-09-10 Moule de coulée sous pression pour la coulée de carters-cylindres ou de parties inférieures de carters de vilebrequin

Publications (2)

Publication Number Publication Date
EP3697554A1 EP3697554A1 (fr) 2020-08-26
EP3697554B1 true EP3697554B1 (fr) 2025-03-26

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EP18778378.2A Active EP3697554B1 (fr) 2017-10-17 2018-09-10 Moule de coulée sous pression pour la coulée de carters-cylindres ou de parties inférieures de carters de vilebrequin

Country Status (6)

Country Link
EP (1) EP3697554B1 (fr)
CN (1) CN111225754B (fr)
DE (1) DE102017124150B4 (fr)
MX (1) MX2020003352A (fr)
RU (1) RU2747340C1 (fr)
WO (1) WO2019076536A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102020108022A1 (de) 2020-03-24 2021-09-30 Bayerische Motoren Werke Aktiengesellschaft Dreiplattendruckgusswerkzeug mit einem Angusssystem und verbesserter Angussabtrennung sowie Verfahren zum Druckgießen
DE102020125343B3 (de) 2020-09-29 2021-09-16 Bayerische Motoren Werke Aktiengesellschaft Dreiplattendruckgusswerkzeug mit verbesserter Angussabtrennung sowie Verfahren zum Druckgießen (I)
DE102020125342B3 (de) 2020-09-29 2021-09-16 Bayerische Motoren Werke Aktiengesellschaft Dreiplattendruckgusswerkzeug mit verbesserter Angussabtrennung sowie Verfahren zum Druckgießen (II)

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DE102012107363A1 (de) * 2011-09-16 2013-03-21 Ksm Castings Group Gmbh Dreiplattendruckgusswerkzeug mit Angusssystem sowie Angusssystem

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Also Published As

Publication number Publication date
DE102017124150B4 (de) 2021-01-28
WO2019076536A1 (fr) 2019-04-25
DE102017124150A1 (de) 2019-04-18
CN111225754A (zh) 2020-06-02
EP3697554A1 (fr) 2020-08-26
MX2020003352A (es) 2020-07-29
CN111225754B (zh) 2022-05-17
RU2747340C1 (ru) 2021-05-04

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