EP3023175B1 - Rohdruckguss in nichteisenlegierungen und verfahren zur herstellung eines rohdruckgusses in nichteisenlegierungen - Google Patents

Rohdruckguss in nichteisenlegierungen und verfahren zur herstellung eines rohdruckgusses in nichteisenlegierungen Download PDF

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Publication number
EP3023175B1
EP3023175B1 EP15460010.0A EP15460010A EP3023175B1 EP 3023175 B1 EP3023175 B1 EP 3023175B1 EP 15460010 A EP15460010 A EP 15460010A EP 3023175 B1 EP3023175 B1 EP 3023175B1
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Prior art keywords
casting
overflow
excess
central hole
raw
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EP15460010.0A
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English (en)
French (fr)
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EP3023175A1 (de
Inventor
Piotr Blaszczak
Pawel Hrankowski
Piotr Staniszewski
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Spinko Spolka Z OO
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Spinko Spolka Z OO
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    • 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

Definitions

  • the invention relates to raw pressure die castings in non-ferrous alloys and the method of producing raw pressure die castings in non-ferrous alloys (mostly zinc, aluminium, magnesium, lead and titan alloys) that can be applied particularly in the precision engineering, armaments, automotive, aerospace, shipbuilding, tool-making or engineering industry and wherever serial and big-lot production of frequently precise, small or very small castings of any, frequently complex, shape, different thickness of walls or very thin walls, and highest dimensional precision and surface smoothness.
  • non-ferrous alloys mostly zinc, aluminium, magnesium, lead and titan alloys
  • the volume of the material allowance for machining is specified in the relevant standard and depends on the casting precision grade, the size of a given surface and the type of material cast.
  • the most frequent material allowances include risers produced in casting holes, grooves, recesses etc., overflows designed to evacuate gases from the mould, situated at the top of the casting and furthest from the entry to the gating system, and additional allowances for gripping a casting during machining.
  • material allowances also include connecting sections preventing castings from deformation and cracking during cooling, heat treatment and finishing, and allowances useful in casting solidification to compensate shrinkage (solidification shrinkage), i.e. reduction in the casting specific volume. They are supposed to prevent the occurrence of shrinkage effects, i.e. cavities and shrinkage porosity that lower mechanical properties of castings.
  • pressure die casting involves rapid injection of molten metal into a steel casting mould and cooling it under high pressure of 30 - 100 MPa (the so-called multiplier pressure) exerted by a hydraulic unit. Introduction of atmospheric air into the mould during that process is inevitable. Frequently, the air remains in the casting as gas porosity. Therefore, it is necessary to evacuate that air from the cavity of a casting mould.
  • the heretofore applied venting channels not always ensured complete or at least efficient evacuation of air (gases) from the cavity. In complex castings, with local volume concentrations (the so-called hot spots), regions occur where the evacuation of air (gases) is impossible.
  • the heretofore known system contains typical systems (1) venting the mould cavity and bleeding gases into the atmosphere and overflow systems (2) facilitating gas evacuation and the gathering of impurities.
  • US Patent no. 5782140 describes a rough steering wheel core metal unit.
  • This rough casting essentially comprises a boss section (11), spoke sections (15, 16), and a ring section (17), which are integrally die-cast.
  • vents and overflows in high pressure casting are also dealt in Marketing materials of ESI Group entitled "Casting Simulation Solutions ProCAST / QuikCAST" - available online at: www.esi-group.com/products /casting/...
  • Metal cores reproducing inner shape of a casting and being removed only in the final phase of its forming in a mould, are evident obstacles for the flow of molten metal, causing difficult to control whirls and turbulences at the head of the stream, which makes even more difficult to evacuate gases after the streams meet having flowed around the core.
  • the aim of this invention was to develop a new design of a raw casting that would contain sufficient material allowances to eliminate the above-mentioned issues and would not evacuate gases and impurities into the atmosphere.
  • a raw pressure casting in non-ferrous alloys which is body of a turbocharger, equipped with a casting sleeve forming a central hole which fulfills the role of the inlet diffuser in the finished product,_contain structural elements in the form of process allowances of which at least one constitutes an excess overflow intended for the evacuation of excess gas and impurities from the mould.
  • a raw casting has an excess overflow in the form of a flat membrane placed inside a casting sleeve, constituting the central opening and/or has a circumferential excess overflow permanently attached to the wall of the central opening, constituting its extension.
  • the flat membrane has a thickness from 0.8 to 1mm and the circumferential overflow has the shape of a cylindrical vent.
  • Method of producing a raw pressure casting from non-ferrous metal alloys, using process allowances, where at least one process allowance is employed in the form of an excess overflow for evacuating excess gas and impurities from the mould, according to the invention is characterized in the excess overflow is used in the form of a flat membrane placed inside a casting sleeve and/or a circumferential overflow is used, permanently attached to the wall of the central opening, constituting its extension.
  • the invention also relates to a method of producing raw pressure castings in non-ferrous alloys which is body of a turbocharger and provided with a casting sleeve, constituting a central opening that acts as a ventilator in the finished product, in which material allowances are used.
  • At least one material allowance is applied in a form of an excess overflow to evacuate gases and impurities from the mould cavity without connecting it with the atmosphere.
  • an excess overflow is employed in a form of a flat-wall membrane fitted inside a casting sleeve or an excess overflow in a form of a peripheral overflow permanently fixed to the wall of a central hole in the casting.
  • a solution according to the invention resulted in a new, unique solution in a form of material allowances that improve the rate of gas flow in the mould cavity and the flow of molten metal inside the mould cavity, and cause that residual air (gases) is (are) gathered in one excess overflow without evacuating it (them) to the atmosphere.
  • air (gas) pressure distribution has been modified in critical regions of the casting, whereas the application of excess overflows without connecting them with the atmosphere, turns out to be more environment friendly than the heretofore known and applied solutions.
  • Fig. 1 is a half-sectional elevation of a raw casting of a turbocharger body while Fig. 2 is a top view of a raw casting of a turbocharger body.
  • a new design of a pressure casting mould was developed to produce turbocharger bodies as a result of which raw castings of the body 1 have two excess overflows designed to evacuate gases and impurities from the mould cavity without connecting it with the atmosphere.
  • One of the said excess overflows has a form of a 0.8 to 1 mm thick flat-wall membrane 2 fitted inside a casting sleeve constituting a central hole 3 serving as an intake diffuser in the end product.
  • the other excess overflow has a form of a ring-shaped peripheral overflow 4 shaped as a cylindrical vent permanently fixed to the wall of the central hole 3 and constituting its continuation, which is easily removed in the machining process.
  • a casting mould was filled with a molten aluminium alloy under working pressure of 200 bar.
  • all gases, including residual air and impurities were gathered in the flat-wall membrane 2 and in the peripheral ring-shaped overflow 4 without evacuating them into the air.
  • Both material allowances containing casting defects were removed from the casting in the subsequent process, namely machining.
  • peripheral overflow 4 in particular can have a number of forms because its shape is strictly connected with the shape of the section of the central hole 3 in the body casting 1.

Landscapes

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

Claims (4)

  1. Ein rohes Druckgussstück aus Nichteisenlegierung beliebiger Form, das ein Körper eines Turbokompressors ist, ausgestattet mit eine Gusshülse, die eine zentrale Öffnung darstellt, die in der Fertigware Rolle eines Einlaufdiffusors erfüllt und Konstruktionselemente in Form der Materialvorsprünge enthält, denen mindestens ein Stück als ein Überlauf zur Entfernung der Gase und Verunreinigungen aus der Form ohne deren Verbindung mit der Atmosphäre ausgerichtet ist, gekennzeichnet dadurch, dass der Überlauf eine Form der flachen Wand hat, (2) die innerhalb der Gießhülse, die eine zentrale Öffnung darstellt, (3) platziert ist; oder mit einem umlaufenden Überlauf versehen ist, (4) der an die Wand der zentralen Öffnung auf Dauer angebracht ist (3) .
  2. Rohes Gussteil nach Anspruch 1, gekennzeichnet dadurch, dass die Membran (2) von flachen Wänden Stärke von 0,8 bis 1 mm aufweist.
  3. Rohes Gussteil nach Anspruch 1, gekennzeichnet dadurch, dass der umlaufende Überlauf (4) die Form eines zylindrischen Entlüfters hat.
  4. Verfahren zur Herstellung eines Rohgussstücks aus einer Nichteisenlegierung von beliebiger Form, das ein Körper eines Turbokompressors ist, der mit einer die zentrale Bohrung bildenden Gusshülse ausgestattet ist, die im fertigen Produkt die Rolle des Einlaufdiffusors erfüllt, unter Anwendung der Materialvorsprünge, im Falle von mindestens einen Materialvorsprung, wenn mindestens ein Materialvorsprung in Form eines Überlaufs zur Entfernung der Gase und Verunreinigungen aus der Form ohne deren Verbindung mit der Atmosphäre verwendet wird, gekennzeichnet dadurch, dass der Überlauf in Form einer flachwandigen Membran verwendet wird, die innerhalb der Gießhülse, die die zentrale Öffnung (3) darstellt, angeordnet ist, oder dadurch, dass der umlaufende Überlauf dauerhaft an der Wand der zentralen Öffnung (3) angebracht ist.
EP15460010.0A 2014-11-18 2015-03-26 Rohdruckguss in nichteisenlegierungen und verfahren zur herstellung eines rohdruckgusses in nichteisenlegierungen Active EP3023175B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL410172A PL235466B1 (pl) 2014-11-18 2014-11-18 Surowy odlew ciśnieniowy ze stopów metali nieżelaznych

Publications (2)

Publication Number Publication Date
EP3023175A1 EP3023175A1 (de) 2016-05-25
EP3023175B1 true EP3023175B1 (de) 2021-03-17

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PL (1) PL235466B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109158536B (zh) * 2018-10-29 2020-05-05 扬州广润机械有限公司 一种预防汽车球铁转向器壳体铸件泄漏的铸造工艺

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JPH08268288A (ja) * 1995-03-29 1996-10-15 Toyoda Gosei Co Ltd ステアリングホイール芯金
JP4071659B2 (ja) * 2003-03-28 2008-04-02 富士通株式会社 金属成形用金型
DE10339879A1 (de) * 2003-08-29 2005-03-24 Hella Kgaa Hueck & Co. Opto-elektronische Vorrichtung für ein Kraftfahrzeug
JP2005288549A (ja) * 2005-05-10 2005-10-20 Mitsubishi Electric Corp 金属溶融射出成形装置、ゲート構造
DE102007062436B4 (de) * 2007-12-20 2010-11-11 Gottfried Wilhelm Leibniz Universität Hannover Verfahren zur Herstellung eines Gussteils

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EP3023175A1 (de) 2016-05-25
PL235466B1 (pl) 2020-08-24
PL410172A1 (pl) 2016-05-23

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