FR2474360A1 - INSTALLATION FOR MOLDING LIGHTWEIGHT METAL ALLOY FOUNDRY PARTS BY MEANS OF A SHELL MOLD, PARTICULARLY FOR CYLINDER HEADS OF COMBUSTION DRIVING MACHINES - Google Patents

Abstract

THE MOLDING PLANT 1 FOR MOLDED PARTS IN LIGHT METAL ALLOY BY MEANS OF PERMANENT MOLDS, ESPECIALLY FOR COMBUSTION ENGINE CYLINDER HEADS INCLUDES THREE STATIONS A, B, C, DISTRIBUTION DEVICES FOR EXAMPLE FOR HEATING, COOLING, COOLING ETC. PROVIDED FOR THE PERMANENT MOLD. AMONG THE THREE STATIONS A, B, C, CENTRAL STATION B SERVES AS A WORK STATION FOR SEPARATION OF THE SHELL PARTS, EXTRACTION OF THE MOLDED PART, FOR THE PLACING OF CORES AND FOR THE UNION OF THE SHELL PARTS ; THE OTHER TWO STATIONS A AND C ARE USED AS A MOLDING STATION; BETWEEN THESE LATTERS ARE PROVIDED FOR TWO MOVABLE SHELLS 2, 2A. EACH SHELL SHOWS INTRODUCTORY PARTS 16, 16A ON THEIR OPPOSITE FRONTAL FACE; THE CASTING DOSING OVEN 17, 17A IS AVAILABLE IN THE EXTENSION OF THE DIRECTION OF MOVEMENT OF THE SHELLS 2, 2A. WE CAN THUS ENSURE PERMANENT OPERATION WITH THE LOWEST POSSIBLE NUMBER OF SHELLS.

Description

i

INSTALLATION FOR MOLDING ALLOY FOUNDRY PARTS

M.rALLIQUE LIGHT BY MEANS OF A SHELL MOLD, ESPECIALLY

FOR CYLINDER HEADS OF COMBUSTION MACHINES

The invention relates to an installation for the

  casting of light metal alloy casting parts

medium of permanent mussels (shells), mainly of tt-

  cylinders for combustion engines, in use

  reading shells divided into parts, the movement of the shell parts and an extraction device for the

melted part being undertaken using functional mechanisms

using pressure agents, dispensing devices

  bution, for example, for heating, cooling

etc ... being provided for the mold.

  Shell casting of light metal parts or the like is accomplished in various ways. For the manufacture of light metal cylinder heads, shells are used which are divided in their longitudinal plane, the shell parts being slidably mounted for closing and opening the mold. For this, multiple actuators with hydraulic operation are used which are

attached to the shell parts. In addition,

  tction for the extraction of the melted part are connected to the permanent mold. In the case of a stationary arrangement of the shell molding installation, the production by

  unit of time is relatively small.

  There is also known a provision in which the manufacture of cylinder heads of light metal is carried out

  in a cyclic system, thanks to the use of a

quet on which the molds move in a circle. In that case

  also, the parts of the shell of the divided mold are also

  also directly connected to the hydrau-

  liques for moving the shell parts and also

  for the actuation of the extraction device for the

  melted piece. This also applies to the supply of food

3S mold for heating or cooling parts

  shell parts, the pipes being directed, with

  corresponding rotary couplings, to an upright column centered

  inside the turnstile. In such a system

Z474360

cyclic for shell casting, each mold perma-

nent is equipped with the most diverse actuators.

their corresponding fittings as well as parts of

positive supply, it being understood that more

  Each time take into account the need to slide the shell parts. Such a construction of each individual shell with all the necessary actuating members, etc. does not only noticeably increase the perimeter, the volume and the size of the mold, but also increases the costs of manufacturing the mold and installation as well as operation because large masses must be mobilized. To be able to work rationally, it is necessary, in order to prepare the mold for casting in time

  next in the cyclic system, to provide a cool-

  compulsory for the mold, which makes the manufacture and operation of the mold complicated and further increases the cost. It is also known, during the manufacture of gray cast iron foundry parts, to pass the

  permanent molds along a plurality of work stations

vail and then take the finished piece of gray cast iron by means of a crane-shaped device to another tray, on which the piece of cast iron is allowed to cool slowly. Such a way of working and such a construction

  of the device are not suitable for the manufacture of parts

those of light metal foundry.

The objective of the invention is to carry out an ins-

  tallation for the foundry of light metal alloy foundry parts by means of permanent molds, which allows a simplification of the installation by saving elements

  functional, safer implementation of the pre-

molding of the foundry process molds as well as an

  significant increase in production. The installation of the type thus defined is characterized according to the invention in that it has three stations and that one station serves as a

work for the establishment of the nucleus, the meeting and the

trim the parts of shells and the evacuation of the foundry piece, and that these stations whose central station functions as the work station and the two stations

  external as molding stations, are provided with two co-

movable keels.

  Such an arrangement of the installation for manufacturing molded parts made of light metal or the like by molding in

shell, offers in terms of performance and safety

  installation, space and cost, has significant advantages. We can ensure permanent operation with the lowest possible number of shells, while a molding process is linked to each pass; we

  does not require long journeys between the station

development of the shell for molding to one

  either of the molding stations. The shell with the par-

shell parts spaced apart can be serviced

  from two sides, the access from both sides of the device being limited

  bre. The time the shell needs since filling

  until the molten part is extracted, suffices for the extraction

  tion of the molten part, and the preparation of the shell for the next molding process, so that one can be satisfied with a single work station for the implementation of these working steps. If necessary, the central station can be provided with two work stations arranged one behind the other without the operating cycle being appreciably influenced as regards the duration of each pass. The entire installation becomes simple and

  visible from the fact that the danger of sources of per-

turbation or errors during the operation of the installation

lation is greatly diminished. For the installation of castings as a whole, a high yield is obtained compared to

  the size of the entire installation and the consumption

tion of place. The yield can be increased greatly with simple means. Due to the low consumption of

  instead, several installations can be arranged in a row.

The use of space and space is particular

highly favorable.

Advantageously, the shells of an installation

  tion have their introductory part with the filling spout on a front face remote from the work station, the metering furnace being placed in the

  extension of the direction of movement of the shell.

As a result, the workstation is located at a distance

  this relative! Ternt large casting locations-molding stations, so that work in the workstation

  may, from a safety point of view, be released completely

  molding processes at the molding stations. In the case of the arrangement of several installations in row next to each other, each casting dosing furnace can

be designed to be moved transversely to the direction

shells-de-positioning, so that a metering furnace can be used for several molding stations

of several installations.

  The displacement of the two shells of an installation

  takes place along the rail extending from a mold station

  ge at the other molding station. Therefore, the two shells

  can be kept connected to each other using

a spacer.

According to another essential characteristic of the

  vention the hydraulic actuators for opening

  closing and closing the shell parts as well as for extracting the molded part from the shell bottom part form stationary components of the station

of work. It follows that the shells-are of a cons-

  simple truction, which represents a significant saving of acquisition and operation. We get an economy

  important in device parts and tools. By the-

  movable shell parts are completely independent of the

  hydraulic actuation mechanism. The hydrau-

stationary liquids, both for the extraction device

for the evacuation of the molded part out of the shell or-

vet, are in this stationary arrangement constantly ac-

transferable and can be easily-monitored. We can re-

  immediately mediate certain disturbances without interrupting operation. The shells are

relatively light in weight. So we have to-

care of a relatively low energy consumption for

  moving from to ----------------- --- -

  shell parts and the shells themselves. Onset

  causes of disturbance is greatly reduced.

  In addition, it is provided, according to the invention, that the shell parts of the shell divided lengthwise are mounted transversely displaceable in guides of a common bottom plate, and that the bottom plate

  is mounted by means of centering supports on a flat plate

  bile. Above all, such a construction allows interchan-

  easy manageability of the shells on the mobile trolley,

  te that in case of possible disturbances, a shell in

  operation can be replaced by a new one.

Advantageously, the shell parts come

are engaged with the stationary actuators

  for opening and closing the mold and for lifting it

  ment and lowering of the extraction device by means of

  hook-shaped parts or the like which leave a loose

  short passage between them in the direction of movement of the mold. In this way, it ensures a simple grip and safe operation of the shell parts with the organs

fixed actuation.

  The invention will now be described in more detail.

  using the example embodiments referring to the drawing.

- Figure 1 shows the installation for molding molded parts of light metal or the like by means of a durable mold for cylinder heads of combustion engine machines in elevation and schematically, - Figure 2 shows a cross section from the installation work station to another scale along a cross section II-II of FIG. 1; - Figure 3 shows a cross section through the shell with the base and the device

  displacement, with the mold mounted on it in the refer-

  mé parts of the shell, on an enlarged scale and schematically. The installation for molding casting parts made of a light metal alloy, in particular for molding cylinder heads of combustion engine machines, has permanent molds 2 which are divided in their longitudinal median plane. The shell parts are mounted transversely sliding on a bottom plate 5 and the bottom plate 5 is supported by a lower frame 6 which can move on the rails 7. The installation comprises three stations A, B and C, whose external stations A and C are molding stations while the central station B is a work station for the separation of the shell parts, the extraction of the molded part, the installation of

cores and the meeting of shell parts. At these three stages

tions A, B and C are. adjoining two sets of shell-

  biles 2 and 2a. The rails 7 with their bases 8 rest on longitudinal support beams 9 which can be reinforced by transverse supports 10. At the ends of the tracks are provided bumper posts Il and 12. The work station B has fixed posts

vertical 13, 14, which can be connected by beams 15.

  The shells 2 and 2a have a part of

  production of flows 16, 16a with funnels or necks

  corresponding filling tees on their remote front face

  work station B, that is to say on their respective front faces distant from each other, so that

  in the molding stations A and C the locations for

  the respective lines are relatively distant from the sta-

  working tion B. Advantageously, the metering ovens of

casting 17, 17a are arranged in the extension of the direction

displacement of the shells.

  While for example, shell 2a is located in casting station A, the other shell 2 is located in

  workstation B in which the molded part is

  ve extracted after opening of the shell parts 3 and 4.

  Then, the various cores are placed on a fixed bottom part of the mold. After that, the shell parts are brought together and a cover core is put in

place on the mold 4 The shell 2 thus prepared in the sta-

  Work B is then brought to the molding station.

  ge C, after which the filled shell ja is brought from the molding station A into the work station B. In the

molding station C, the shell 2 is filled, using the

pouring furnace 17, of light metal or the like. During the filling process and also afterwards during a

  certain predetermined duration, the shell 2 remains in the sta-

tion molding C while during this time the shell 2a is delivered from the molten part in the work station B and prepared for the implementation of a new casting process. As soon as the working steps in station B have been completed, the shell 2a is brought back to the casting station A. Simultaneously the shell 2 which is in

the molding station C is brought back to the processing station

  vail B. The molding is then carried out in the molding station.

  ge A while in work station B the shell 2 is prepared, after extraction of the molded part, for a new molding step. These working phases with the two shells 2 and 2a and the three molding stations A, B and C can then be continued continuously in an alternative manner. So that the carts or rolling frames of both

shells 2 and 2a remain arranged with a specific spacing

  mined, the trolleys can be kept in fixed relation to each other using a spacer 7. The displacement of the shells with the trolleys can be carried out manually each time using an extension of the carriages. We can however 4'alewent umunir chtriots or movable frames of an actuating motor which is started and stopped at the corresponding rate and which moves the carriages

in either direction.

  Instead of rails 7, 8, it is also possible to use

  a path, of rollers in which the rollers are

born in either direction of rotation, the movable frame 6

  can then rest directly on the roller track.

The construction of the mold with its bottom plate and the movable frame as well as the actuation device for

  the sliding shell parts and also for the dis-

positive extraction will now be described in more detail using Figures 2 and 3. The movable frame 6, for example, a carriage, is movably mounted along the rails 7 by means of

  wheels 20. The bottom plate 5 is provided with center supports

  trage 21 which can come into engagement on parts proemi-

  nentes 22 in the form of studs and which are connected to the carriage 6 or to a corresponding plate. In this way, the plate

base 5 with mold 2 can be interchanged on the

  riot 6. A base plate fitted with another type of shell can be easily installed after removal of the first base plate, thanks to the exact centering with respect to

  to carriage 6 or the like and therefore relative to the road

  7, 8. The possibility of interchangeability is not only useful in the event of deterioration of a mold but also for being able to use on the same transport device

  permanent molds of different types and sizes.

  The permanent molds 2, 2a have shell parts 3, 4 separated by a longitudinal median plane ,, which are open for the extraction of the molded part by displacement in transverse direction and which must again

  be brought together for the casting process. The parties of co-

  movable keel 3, 4 are slidably mounted on guides 23 of their common bottom plate 5. For this purpose,

  ] The shell parts can rest on sliding rails

24 and they are guided on a centering rail 26 by means of end pieces 25 carried by the shell parts. At the ends of the transverse faces of the shell parts

  3, 4 can be arranged each time a bar 27 on the plate

  that base 5 which surmounts a prominent extension 28 of the shell part. In this way, we ensure a movement

Safe, exact and proven sliding of the two parts of co-

  keel away from each other and towards each other without

risk of jamming.

For moving the shell parts 2 and 3

  for opening and closing the mold,

tior.nement, for example hydraulically actuated, are fixedly arranged on each side of the work station B. On the posts 13, 14 are piston cylinder units 30, 31 on the cylinder rods-32 , 33 of which are provided, at the free ends, hook-shaped parts 34, 35 in the recesses 34a, 35a of which penetrate

  end caps 36, 37 which are firmly connected to the co-

  keel 3, 4. In addition, on the shell parts 3, 4 are e474360

  provided with stop parts 38, 39 against which the fa-

these fronts of the hook-shaped parts 34, 35 come to bear for the closing movement or joining of the shell parts 3, 4. The recesses 34a, 35a are provided, in the hook-shaped parts 34, 35, so such that the hook-shaped parts 34, 35 and the end pieces 36, 37

leave a free passage between them in the direction of

  mold placement. When the mold arrives in work station B, the end pieces 36, 37 of the shell parts are automatically placed inside the recesses 34a, 35a of the hook-shaped parts 34, 35. Then, the parts

  shell 3, 4 can be opened and closed with a

  traction or compression of the cylinders 30, 31. The

  shell parts remain independent of the mechanism

hydraulic actuation so that as regards the implementation of the sliding movements, they can be constructed in a particularly simple manner. The hook-shaped attachment of the parts can also be carried out under

  a form in which the shell parts would be

  views of a hook-shaped part. The stop parts

  38, 39 can simultaneously also be used to come, on the che-

min from the mold to the molding stations A and C and also in

work station B in contact with available guide rails

  correspondingly positioned and guided so that the shell parts remain maintained

pressed against each other between the guide rails.

  A corresponding provision concerning the

  fixed level of the hydraulic actuating members is also

  ment provided for the extraction device 41. This may have a lifting bar 42 which is slidably mounted on rods 43 which are fixed to the bottom plate 5. To the lifting bar 42 is connected a rod 44 provided with a flange 44a and freely passing through the carriage

  6 through a passage 45. A fixed hydraulic lifting cylinder pre-

  feels a cylinder rod 47 to which is fixed a double hook part 48 whose hook ends surround the flange 44a of the hanging rod 44. The hook-shaped part 48 can also be guided along a rod 50

  by means of an extension 49. As soon as the shell parts

  the 3, 4 were separated from each other by means of -

fixed cylinders 30, 31 and that the molded part has become

  free, the fixed push cylinder 46 is actuated.

  The hook-shaped part 48 comes by its base face to bear against the hanging rod 44 and pushes it upwards and therefore also the pushers 51 fixed

  on the bar 42 so that the molded part is raised above

above the bottom portion 52 of the mold. In the raised state, the molded part can be removed from the open mold using a clamp device or the like. After that, the cylinder 46 is again reactivated. It pulls by means of the hook-shaped part 48 the rod 44y which penetrates with the flange 44a again downwards so that the upper front surfaces of the pushers 51 are brought back into alignment with the

  surface of the bottom portion 53 of the shell.

  For stopping the movable frame 6 with bottom plate receiving the mold, a designated stop device is used

par 54. This presents a jack unit 55 which is

  pivoted at 56 on a fixed bracket 57. The piston rod 58 has an end piece 59 which is articulated on the pivot

  61 of a two-arm lever 60, the lever 60 being pivoted

  axis 62. The lever 60 acts on end pieces 63 of the bottom plate 5. In the shell stop position with

the carriage 6 in station B, the frame is thus stopped

  tee by pressing on the rails 7 or an ana roller track

log. he

Claims (7)

  1 - Installation for molding parts molded from a light metal alloy by means of permanent molds, no '   especially for cylinder heads of combustion engines   tion, using divided shells, in which the mo- shell parts and an extraction device   tlon for the molded part is carried out by ac-   operated by a pressurized medium and in which are   view, for the mold, of supply devices, no-   particularly for heating, cooling, etc., laughed at by the fact that the installation (1) has three stages tions (A, B, C) of which two stations (A and C) serve as sta- molding and a work station (B) for separating the shell parts and extracting the   molded part, for the installation of cores, and for the re- union of the shell parts, and in that the three sta- tions (A, B, C) with the central station (B) forming the work station and the two external stations (A and C) serving as   molding stations, are provided with two shells moved wheat (2, 2a).   2 - Installation according to claim 1, character- laughed at by the fact that each shell (2, 2a) presents par-   introduction parts of casting material (16, 16a) with gou-   monkfish filling on its front side away from the sta-   tion of work (B), that is to say on their respective faces- far apart, and that the pouring metering furnace (17, 17a) is arranged in the extension of the direction of movement shells (2, 2a).   3 - Installation according to one of claims 1   and 2, characterized in that the two shells (2, 2a) or their movable frames (6) are held together by means of a spacer (17) and that the two shells (2, 2a) are movable along the rails (7, 8) extending from the molding station (A) to the molding station (C).   4 - Installation according to one of claims 1   to 3, characterized in that the central position is di- aimed at two workstations.   - Installation according to one of claims 1 to   4, characterized in that the hy- hydraulics (30, 31, 46) for the opening and the meeting of the   shell parts (3, 4) as well as for extracting the part molded out of the shell bottom part (52) for- stationary elements of the workstation (B).   6 - Installation according to one of claims 1   to 5, characterized in that the shell parts (3, 4) of the shell divided in length (?, 2a) are arranged transversely sliding in guides (23) on a common bass plate (5) and that the common base plate (5) is disposed by means of centering supports on a frame mobile (6).   7 - Installation according to one of claims 1   à6, characterized in that the shell parts (3, 4) with the stationary actuating members (30, 31, 46) for opening and closing the mold, for lifting and lowering the device d extraction (41) engage using hook-shaped parts (34, 37, 44a,   48) which allow free passage on both sides towards   displacement of the mold (2, 2a), 8 - Installation according to one of claims 1   to 7, characterized in that several installations in-   dividuals are arranged in a row and the casting metering furnaces (17, 17a) are movable transversely with respect to to the direction of movement of the shells (2, 2a).