EP1057562A1 - Niederdruckgiessanlage - Google Patents

Niederdruckgiessanlage Download PDF

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Publication number
EP1057562A1
EP1057562A1 EP99830342A EP99830342A EP1057562A1 EP 1057562 A1 EP1057562 A1 EP 1057562A1 EP 99830342 A EP99830342 A EP 99830342A EP 99830342 A EP99830342 A EP 99830342A EP 1057562 A1 EP1057562 A1 EP 1057562A1
Authority
EP
European Patent Office
Prior art keywords
casting
machine
accordance
moulds
station
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.)
Withdrawn
Application number
EP99830342A
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English (en)
French (fr)
Inventor
Alfredo Dal Pan
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.)
Fata Group SpA
Original Assignee
Fata Group SpA
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 Fata Group SpA filed Critical Fata Group SpA
Priority to EP99830342A priority Critical patent/EP1057562A1/de
Publication of EP1057562A1 publication Critical patent/EP1057562A1/de
Withdrawn legal-status Critical Current

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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
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D33/00—Equipment for handling moulds
    • B22D33/02—Turning or transposing moulds

Definitions

  • the present invention relates to casting machines having the characteristics specified in the preamble of Claim 1. Such machines are currently being referred to as "low-pressure" casting machines.
  • Low-pressure casting machines have a number of intrinsic advantages over their traditional machines, which include gravity casting machines (where the casting material is simply poured into the moulds) or pressure casting machines (where the casting material is injected into the moulds under the action of the high pressure generated by a piston).
  • One of these advantages for example, consists of the energy saving that derives from the fact that only a minimal quantity of casting material has to be brought up to melting point without subsequently being incorporated in the casting.
  • Another series of advantages is bound up with the fact that the introduction of the casting material into the mould can be accurately controlled, avoiding the establishment of turbulent flows during the mould-filling process. It is also possible to obtain controlled cooling of the casting, which preferably commences from the upper layers that are more distant from the point or points at which the casting materials enters the mould.
  • the principal drawback associated with low-pressure casting technique - in the form in which it has hitherto been implemented - is bound up with having to wait while the newly formed casting solidifies inside the mould before the machine can be prepared for a new casting cycle.
  • the source of the casting material generally a furnace
  • the casting material introduced into the mould has become re-solidified: if this operation were to be attempted before the solidification of the lower part of the casting (which, to make matters worse, is usually the last to solidify), it could not but cause a certain quantity of the casting material to flow downwards through the opening or openings that served to introduce this material.
  • the casting operation in the true sense of the term, i.e. the filling of the mould with the casting material, will occupy an interval of the order of some tens of seconds (thirty seconds, for example).
  • the subsequent cooling and solidification of the casting may last for several minutes (in purely indicative terms: it may range from about two and a half to five minutes, depending on the size of the casting).
  • the operations that have to be carried out to prepare the machine for the new casting cycle i.e. opening of the mould, removal of the casting, cleaning of the mould, introduction of any patterns, etc.
  • the aforesaid time intervals are additive for the purposes of defining the overall duration the casting cycle, and this has a negative effect as regards the overall efficiency of the machine in terms of output per unit time.
  • the present invention sets out to provide a low-pressure casting machine of the type just specified and such as to offer as its principal advantage the possibility of obtaining a substantially increased productivity, possibly also combined with other advantages connected with the carrying out of the various operations that have to be performed on the mould in order to prepare it for the new casting cycle.
  • the reference number 1 in these drawings is used to indicate the whole of a low-pressure casting machine.
  • the machine 1 comprises a general scaffolding 2 that consists essentially of a robust structural steelwork frame with a lower portion 3 that, at least in the immediate vicinity of one casting station (indicated as a whole as 4), has the general configuration of a tunnel. All this in such a way as to make it possible for a furnace 6 intended to act as the source of the casting material to be introduced below the casting station 4 and, more particularly, below a base plate indicated by the reference number 5.
  • the furnace 6 is preferably mounted on such motion organs 8 as wheels, rollers, slides, etc., that make it possible for it to be moved selectively to the inside of the tunnel part 3 in the scaffolding 2 in such a way as to bring one or more ducts 9 for supplying the casting material into vertical alignment with the casting station 4.
  • the furnace 6 finds itself in a position in which the supply duct or ducts 9 are aligned with one or more corresponding openings 10 communicating with the lower part of a mould 11 situated at the casting station 4.
  • lifting means which are here schematically represented by the jacks 7a or some similar linear actuator devices, make it possible to raise the casing 7 of the furnace and thus causing the casting material supply duct or ducts 9 to penetrate into the opening or openings 10 and to establish conditions in which the or each duct 9 and the respective aperture 10 become tightly jointed and can therefore be used as channel for the introduction of the casting material into the mould 11.
  • the mould 11 will preferably consist, once again in a well known manner, of two complementary elements (which are here referred to as the lower part 11a and the upper part 11b), with the further possibility (according to the geometric characteristics of the particular casting to be made) of inserting into the moulds refractory bodies (so-called "patterns") capable of preventing the penetration of the casting material and thus giving rise to corresponding cavities within the casting that is formed around them.
  • the mould 11 rests on the robust base plate of a rotating support unit 12, which will described in greater detail further on, and is subjected to a downward pushing action that is applied to it by a slide 13.
  • the slide 13 is mounted on a series of uprights 14, 140 forming part of the scaffolding 2 in such a way as to have the said capacity of vertical motion.
  • the motion of the slide 13 is realized by means of an actuator element 15 (which in a typical embodiment will be a fluid jack) that acts between the said slide 13 and a butting or bumper structure 16 likewise mounted on the uprights 14, 140.
  • the slide 13 acts on the mould (usually at a point situated on the upper part 11b) through one or more contrast elements 13a, each of which constitutes a thrust formation.
  • the slide 13 is also associated with a pick-up structure 130 that can be likened to a clamp capable of grasping the upper part 11b of the mould 11 via the gripping elements 131, the function of which will be described in greater detail further on.
  • the downward thrust exerted by the slide 13 controlled by the actuator element 15 is transferred onto the mould 11 by the contrast elements 13a .
  • the purpose of this arrangement is to force the mould 11, the lower part 11a of which is provided with the opening or openings 10, towards the base plate 12 and, more particularly, towards the casting material supply duct 9 of the furnace 6, thereby realizing the desired conditions of tight connection between the internal volume of the furnace (casing 7) and the internal casting volume of the mould 11.
  • the movement of the actuator element 15 is produced as the result of a command given to the processing unit - typically a Programmable Logic Controller (PLC) or a Personal Computer (PC) - that supervises the functioning of the machine 1 as a whole, and therefore also the functioning of all the motor or actuator organs here described.
  • PLC Programmable Logic Controller
  • PC Personal Computer
  • the actuator 15 can also be operated in such a way as to slightly raise the upper part 11b of the mould 11, which is retained by the pick-up formation 130 acting through the tightening elements 131.
  • this need will arise whenever there is an interruption of the functioning of the machine 1 as a whole: in these conditions, in fact, it is important to avoid the complete solidification of the casting inside the mould at that moment situated in the casting station 4 with all the problems and difficulties that could derive from this event.
  • the aforesaid raising movement ensures that the casting will be raised from the lower part 11a of the mould 11 since it will tend to follow the upper part 11b by virtue of the fact that that the solidification process commences at the top and continues downwards, so that the casting is more firmly anchored to this upper part 11b of the mould.
  • Low-pressure casting technique provides for the airlike mass that occupies the part of the casing 7 of the furnace 6 situated above the free surface of the casting material in the molten state present within the casing 7 to be pressurized by means of a pumping organ 60.
  • the said pumping organ 60 is selectively controlled in such a manner as to create within the said airlike mass (either air or - especially in the case of casting materials of a particular type, magnesium alloys for example, some inert gas) a pressure level such as to ensure that the casting material will be able to rise (through the duct or ducts 9 that draw from the bottom part of the mass of molten casting material) to within the mould 11. All this with a view to forming within the said mould (as a result of its gradually being filled from the bottom upwards, starting from the opening 10) a cast body realized by means of low-pressure casting.
  • low pressure indicates the fact that the pressurization level needed to make the fluid casting material rise to inside the mould 11 is, taken on the whole, rather low, especially when compared to the pressures used in pressure casting techniques. Even though this pressure is rather limited, the fact that ducts 9 of a certain section are needed (to obtain the filling of the moulds 11 in a reasonably short time) ensures that an upward force of considerable magnitude will be acting on the moulds 11 while the casting process is in course. This situation therefore requires the structure to exert (via the slide 13 and the elements associated with it) a firm reaction on the mould 11 that will tend to push it in the opposite direction (i.e. downwardly). The same applies as regards the supporting and lifting elements 7a that force the casing 7 of the furnace 6 towards the opening or openings 10, thereby assuring adequate tightness of the joints.
  • the duct or the ducts 9 can be disengaged from their respective openings 10, thus making it possible for the mould 11 to become displaced with respect to the scaffolding 2 and to move away from the furnace 6.
  • the aforesaid disengagement motion can be obtained as the result of a relative motion due to the slight raising of the base plate 12 (obviously disengaged from the strong downward thrust exerted by the slide 13).
  • the base plate 12 which acts as the supporting unit of the moulds, is capable of carrying out the said raising movement relative to the scaffolding 2 by virtue of the fact that it essentially consists of a kind of merry-go-round revolving around a central core or hub 18 mounted on one of the uprights of the scaffolding 2 and indicated 140. Being situated in a central position with respect to the scaffolding 2 (note, in particular the views of Figures 3 and 4), the upright 140 constitutes a kind central column of the this scaffolding.
  • the hub 18 has an associated actuating element 180 of its own - preferably a fluid jack - that enables it to realize the aforesaid raising motion (and, of course, the complementary downward motion) as an axial sliding motion along the upright 140.
  • the hub 18 is also fitted around the said central upright 140 in such a manner as to permit it to rotate in a controlled manner around a central vertical axis of the machine - indicated X140 - whenever a motor 19 is set in motion: the motor in question is preferably an electric motor and is once again controlled by the PLC unit (not shown in a specific manner on the drawings) that controls in a coordinated manner the various other motor/actuating elements incorporated in the machine.
  • the motor 19 acts on the hub 18 through a motor reducer unit and a transmission, which could be - for example - a belt or a chain 21.
  • the base plate 12 has a structure that is substantially symmetrical with respect to the axis X140, situated preferably in a barycentric position with respect to the plate 12.
  • the said base plate can therefore be seen as deriving from the bringing together of two bracket-like parts that are capable of symmetrically sustaining two moulds 11 carried by two respective portions 12a and 12b of the base plate 12 and making the said moulds 11 rotate around the axis X140 in accordance with a general merry-go-round layout.
  • the mould 11 shown in the left-hand part of Figure 1 is likewise made up of a lower part 11a and an upper part 11b and, further, is provided with one or more openings 10 for the introduction of the casting material, each associated with its respective gasket ring 110. Associated with the upper part 11b, the mould is also provided with the expulsion plate 11c.
  • the motor 19 can be activated to make the base plate 12 rotate about the vertical axis X140 (after the plate has been raised along this axis) in such a manner as to bring the two moulds mounted in symmetrical positions on the two parts 12a and 12b of the plate to occupy their respective previous positions.
  • the mould 11 within which a casting has just been formed (at the casting station 4 shown in the right-hand part of Figure 1) will thus be moved to the other machine station (indicated as a whole by the reference number 22 and shown in the left-hand part of Figure 1), where it can be subjected to the various operations of discharging the newly formed casting and preparing the mould for the next casting cycle.
  • the station 22 (which will henceforth be distinguished from the casting station 4 by referring to it as the "auxiliary" station) has a structure that is on the whole similar to that of the casting station. It, too, is ideally defined by further uprights 23 that, together with the previously described central upright 140, form a kind of triangular cage, the height of which (for reasons that will be clear further on) is somewhat greater than the height of the cage that defines the casting station 4.
  • stanchion structure just described which consists of five uprights, that is to say, a central upright 140 and two pairs of uprights (respectively 14 and 23) arranged at the vertices of a Saint Andrew's cross, constitutes a choice that is preferential but not imperative for the purposes of implementing the invention.
  • the station 22 comprises the slide 24, which is intended to act on the moulds 11 when they come to be situated in the auxiliary station 22.
  • This slide can move vertically along the uprights 140 and 23 under the action of an appropriate actuator means 26 (preferably, once again a fluid jack) mounted on the reaction structure 25 situated at the top of the stanchions 140 and 23.
  • the slide 24 is provided with one or more contrast elements 24a below a tilting device 27, subsequently to be described in greater detail, and a pick-up formation 240 capable of acting on the upper parts 11b of the moulds 11 through their respective gripping elements 241.
  • the casting in question can thus be picked up (for example, by means of a manipulator robot not shown in the figures, but of a known type), causing it to become detached from the upper part 11b by means of the plate 11c, which is controlled (at 28a) by its respective actuator 28, which is similar to the actuator 17 previously described in connection with the casting station 4.
  • attachment formations 17a and 28a interposed between the actuators 17 and 28 and the plates 11c of the moulds 11 must be configured in such a way as to render possible the necessary engagement motions following the displacement of the moulds 11, this also in relation to the raising/lowering motion of the plate 12.
  • a further actuator 30 (preferably constituted - once again - by a fluid jack and preferably acting between the slide 24 and the tilting device 27) makes it possible to selectively impose (usually by means of a command given by an external operator) a general motion of rotation around a horizontal axis X27 upon the tilting device 27 and, more particularly, upon the lower portion of this structure.
  • the said lower portion carries the upper part 11b of the mould 11.
  • the axis X27 and the actuator 30 are usually situated on opposite sides of the tilting device 27 (as can be noted by reference to Figure 2).
  • the extension motion of the actuator 30 will produce an overall bascule motion of the lower part of the tilting device 27 and thus produce a corresponding rotation or bascule motion of the upper part 11b of the mould occupying the auxiliary station 22.
  • the result of the said bascule motion is thus that of moving the part 11b towards one of the sides of the scaffolding of the machine and into a position in which the mould is readily accessible - and in conditions of safety - for carrying out any necessary maintenance operations (which may be carried manually and / or automatically). Such operations may become necessary, for example, to remove any casting material residues that may have remained in the mould.
  • the mould - by means of a motion complementary to the one that has just been described - can be brought back into the position shown on the left-hand side of Figure 1. In this condition the mould is once again ready for commencing a new casting operation.
  • the solution in accordance with the invention therefore makes it possible for the various operations of removing the newly formed casting from the mould, cleaning the mould and preparing it for the next casting operation (including the insertion into the mould of any necessary patterns or similar auxiliary elements) to be carried out at the auxiliary station 22.
  • the solution in accordance with the invention is wholly compatible with the need for periodically reconstituting (by means of state-of-the-art techniques not illustrated) the level of the casting material within the furnace 6 and/or subjecting the furnace 6 to any necessary check-up and maintenance operations. This even when the carrying out of these operations requires the furnace 6 to be withdrawn from its position within the scaffolding 2 of the machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP99830342A 1999-06-04 1999-06-04 Niederdruckgiessanlage Withdrawn EP1057562A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99830342A EP1057562A1 (de) 1999-06-04 1999-06-04 Niederdruckgiessanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99830342A EP1057562A1 (de) 1999-06-04 1999-06-04 Niederdruckgiessanlage

Publications (1)

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EP1057562A1 true EP1057562A1 (de) 2000-12-06

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EP99830342A Withdrawn EP1057562A1 (de) 1999-06-04 1999-06-04 Niederdruckgiessanlage

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EP (1) EP1057562A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270114A1 (de) * 2001-06-18 2003-01-02 Kwc Ag Niederdruck-Kokillengiessanlage und Kokille dafür
EP1270115A2 (de) * 2001-06-18 2003-01-02 Kwc Ag Niederdruck-Kokillengiessanlage und Verfahren zum Betrieb davon
CN102764874A (zh) * 2012-06-29 2012-11-07 浙江今飞凯达轮毂股份有限公司 一种双工位低压铸造机
CN105772682A (zh) * 2016-05-24 2016-07-20 秦皇岛信越智能装备有限公司 一种低压铸造自动化单元
AT517421A1 (de) * 2015-06-15 2017-01-15 Fill Gmbh Gießvorrichtung
CN111673070A (zh) * 2020-07-13 2020-09-18 安徽海立精密铸造有限公司 一种树脂砂铸造设备及铸造工艺
CN111974968A (zh) * 2020-09-21 2020-11-24 江苏张驰轮毂制造有限公司 一种铝合金轮毂挤压铸造成形模具
CN112404399A (zh) * 2020-11-23 2021-02-26 苏州金瑞阳模具有限公司 低压铸造模具通用标准模架
CN112872333A (zh) * 2021-01-12 2021-06-01 滁州恒昌机械装备制造有限公司 一种挖掘机护板铸件出料装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1963421A1 (de) * 1968-12-21 1970-08-27 Carlsen John Erik Marius Stuetzkonstruktion fuer die Giessform einer Vorrichtung zum Vergiessen von Metallen
JPS57171560A (en) * 1981-04-13 1982-10-22 Meichiyuu Sangyo Kk Low pressure casting device
EP0398168A1 (de) * 1989-05-19 1990-11-22 Kwc Ag Niederdruck-Kokillen-Giesseinrichtung
US5205341A (en) * 1990-02-27 1993-04-27 Starline Manufacturing Company, Inc. Low pressure double arm casting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1963421A1 (de) * 1968-12-21 1970-08-27 Carlsen John Erik Marius Stuetzkonstruktion fuer die Giessform einer Vorrichtung zum Vergiessen von Metallen
JPS57171560A (en) * 1981-04-13 1982-10-22 Meichiyuu Sangyo Kk Low pressure casting device
EP0398168A1 (de) * 1989-05-19 1990-11-22 Kwc Ag Niederdruck-Kokillen-Giesseinrichtung
US5205341A (en) * 1990-02-27 1993-04-27 Starline Manufacturing Company, Inc. Low pressure double arm casting apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 016 (M - 187) 22 January 1983 (1983-01-22) *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270114A1 (de) * 2001-06-18 2003-01-02 Kwc Ag Niederdruck-Kokillengiessanlage und Kokille dafür
EP1270115A2 (de) * 2001-06-18 2003-01-02 Kwc Ag Niederdruck-Kokillengiessanlage und Verfahren zum Betrieb davon
EP1270115A3 (de) * 2001-06-18 2004-10-13 Kwc Ag Niederdruck-Kokillengiessanlage und Verfahren zum Betrieb davon
CN102764874A (zh) * 2012-06-29 2012-11-07 浙江今飞凯达轮毂股份有限公司 一种双工位低压铸造机
CN102764874B (zh) * 2012-06-29 2014-05-07 浙江今飞凯达轮毂股份有限公司 一种双工位低压铸造机
AT517421A1 (de) * 2015-06-15 2017-01-15 Fill Gmbh Gießvorrichtung
AT517421B1 (de) * 2015-06-15 2019-08-15 Fill Gmbh Gießvorrichtung
CN105772682A (zh) * 2016-05-24 2016-07-20 秦皇岛信越智能装备有限公司 一种低压铸造自动化单元
CN111673070A (zh) * 2020-07-13 2020-09-18 安徽海立精密铸造有限公司 一种树脂砂铸造设备及铸造工艺
CN111974968A (zh) * 2020-09-21 2020-11-24 江苏张驰轮毂制造有限公司 一种铝合金轮毂挤压铸造成形模具
CN111974968B (zh) * 2020-09-21 2021-12-28 江苏张驰轮毂制造有限公司 一种铝合金轮毂挤压铸造成形模具
CN112404399A (zh) * 2020-11-23 2021-02-26 苏州金瑞阳模具有限公司 低压铸造模具通用标准模架
CN112404399B (zh) * 2020-11-23 2022-05-27 苏州金瑞阳模具有限公司 低压铸造模具通用标准模架
CN112872333A (zh) * 2021-01-12 2021-06-01 滁州恒昌机械装备制造有限公司 一种挖掘机护板铸件出料装置

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