FR2540761A1 - INSTALLATION FOR MOLDING IN LOST MODEL - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS AN INSTALLATION FOR MOLDING IN A LOST MODEL, INCLUDING AT LEAST FOUR BINS INTENDED TO CONTAIN A PULVERULENT OR PULVERULENT MATERIAL, AT LEAST ONE OVEN INTENDED TO CONTAIN A MELTING METAL, AT LEAST ONE MANIPULATOR OWN TO INSERT THE MODELS BINS OF PELLET MATERIAL AND TO EXTRACT THE MOLDED PARTS, AND AT LEAST A CLEAN LADLE TO TAKE FUSION METAL IN A FURNACE AND TO POUR IT IN A BIN. ACCORDING TO THE INVENTION, BINS 1A, 1B, 1A AND 1B ARE ARRANGED IN PAIRS, THE TWO BINS OF THE SAME PAIR BEING CARRIED BY A SAME PLATFORM 2A OR 2B SWIVEL MOUNTED WITH RESPECT TO A FIXED BUILDING, AND THE BINS INSTALLATION INCLUDES MEANS TO ROTATE THE PLATFORM 2A OR 2B ACCORDING TO AN APPROXIMATELY 180 ANGLE, THE BINS CAN THUS OCCUPY A FIRST EXTREME POSITION AND A SECOND EXTREME POSITION DIAMETRALLY OPPOSED IN RELATION TO THE FIRST.

Description

Installation for molding in lost model.

  It is known to mold metal parts by introducing

  a model made of synthetic material, such as expanded polystyrene

  in a container containing granulated or powdered material such as

  spherical grains, and then pouring a molten metal into the tray During the casting of this metal,

  the plastic material sublimates itself and the metal takes its place as

  This process is known as a model-shaped metal part.

  particular embodiment of this process, the fluid is

  granulated material by admitting compressed air during

  the introduction of the model and the extraction of the Pen-

  the fluidization the model or the casting moves in

  the granulated material as in a liquid.

  The subject of the present invention is an installation for molding in a lost model, in particular in the case where the material

Granulated is fluidized.

  This installation comprises at least four bins intended to contain a granulated or powdery material, at least one oven intended to contain a molten metal, at least one manipulator capable of introducing the models into pans of granulated material and extracting the molded parts therefrom. , and at least one ladle adapted to collect molten metal in an oven and pour it into a tank, and is characterized in that the tanks are arranged in pairs, the two tanks of the same pair being carried by the same platform pivotally mounted relative to a fixed frame, and in that

  it includes means to rotate the platform, followed by

  at an angle of approximately 1800, the trays thus

  a first extreme position and a second extreme position

  I am diametrically opposed to the first.

  In a particular embodiment of the invention, the

  The installation consists of two pairs of bins and two ovens as well as a single manipulator that can serve the bins in their first extreme position, and a single ladle that can serve the ovens

  and the bins being in their second extreme position.

  In this case, the manipulator can be pivotally mounted

  port to a fixed support about an axis equidistant from the axes of the bins in their first extreme position Similarly, the ladle can be pivotally mounted relative to

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  to a fixed support around an axis located equidistant from the axes

  furnaces and shafts of the tanks in their second position.

extreme situation.

  Moreover, the control circuits are advantageously arranged so that the manipulator introduces the model into the tanks located in their first extreme position or extracts the molded parts while the ladle pours the molten metal into

  the bins being in their second extreme position.

  As a nonlimiting example, a description of the present invention is given below.

  of embodiment of the installation according to the invention, with reference

  in the annexed drawing in which:

  Figure 1 is a schematic view of the whole of the

  tallation; Figure 2 is a section along II-II of Figure 1; Figure 3 is a section along III-III of Figure 1;

  Figure 4 is a time diagram of the work cycle.

  As shown in the drawing, the molding installation according to the invention comprises two pairs of la-laa and lb-lb bins, each of the pairs la-laa or lb-1 b being carried by a platform 2a or 2b which can pivot relative to a fixed frame 3 and being surmounted by a suction hood 4; both bins

  of the same pair are angularly offset from each other by 1800.

  Means not shown in the drawing and constituted for example by a jack whose piston rod is secured to a rack in

  taken with a pinion itself secured to the platform, allow-

  alternatively in a direction and in the opposite direction at an angle of 1800 inside each of the bins is arranged a cooling coil 5 connected to a source of water; Moreover each tray has means for

  introduce compressed air to fluidize the granular material

  or powdery it contains.

  The installation also comprises a manipulator 6 carried by a support 7 which is pivotally mounted on a fixed frame 8 around a

  axis 9 equidistant from the axes of the bins 1a and 1b.

  on the one hand to capture a model 10 that is on the trans-

  11 and to place it in the tundishes 1a and 1b and, on the other hand, to enter into a tundish a molded part 12 and to deposit it in a cooling tank 13 In the vicinity of this cooling tank is located a conveyor 14 on which an operator can deposit the molded part 12 after it has been

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cooled sufficiently.

  The installation also includes a ladle 15 carried by a support 16 which is pivotally mounted on a fixed frame 17 around a

  axis 18 This axis is equidistant from the axes of the tanks a and b ain-

  If the axes of two furnaces 19a and 19b a bucket 20 carried by an arm 21 can be placed above the tundishes in positions a and b The ladle 15 allows to

  take molten metal from furnace 19a or 19b and from

pour into the cup 20.

  To each of the tundishes is associated an ejector 22 con-

  staggered by a grid which is connected by an arm 23 to the rod of the

  piston of a cylinder 24 (see Figure 3).

  References 25 and 26 respectively denote a hydraulic unit that feeds all cylinders of the installation and partitions that provide protection of the installation during operation. The operation of the installation which has just been described

is the next.

  The manipulator 6 introduces a model 10 in the tray la, then another model in the tray lb, the two tanks being successively fluidized After stopping the fluidization, it vibrates each

  bin to compact the powder Then rotate the two

  forms 2a and 2b of 1800 to switch the trays la and a, lb and b are brought the cups 20 above the bins the a and b which contain the model parts and to the Using the ladle, molten metal is poured in from the furnace 19a or the furnace 19b. The tanks are then cooled by passing water through the coils. Then the buckets 20 are withdrawn from the tanks and the b and we again rotate platforms 2 a and 2 b

  to bring the bins back to their original position with the help of

  nipulator 6, we seize the molded parts in the bins la and lb

  and deposited successively in the cooling tank 13.

  When each of these molded parts is sufficiently cooled, the operator deposits it on the conveyor 14 which brings it into the

finishing area.

  The control circuits are arranged so that the pouring of the molten metal by means of the ladle 15 takes place while the

  manipulator 6 carries a molded part into the cooling tank.

  In addition, they are arranged so that the platform

  2 b pivots after platform 2a, the time separating the two pivots

  4 254076 units being approximately equal to one quarter of the total duration

of the work cycle.

  Under these conditions, the output rate of the molded parts is regular The ladle 15 alternately feeds the tray which is in the a and that which is in 1 'b On its side the handler 6 takes a model part 10, the removal in the tray la, takes a few moments later, the platform 2 has rotated, the molded part that was in the tray has it to deposit it in the cooling tank 13, then takes a new model piece to deposit it in the tray lb, and finally the platform 2b having rotated, takes the molded part which was in the -bac 1 'b to deposit it

in the tray 13.

  Figure 4 shows the cycle diagram In this diagram,

  tracks I, II, III and IV correspond to the pieces which are

  wind at the instant t in the tanks respectively la, lb, a and

  b, the moment t being that of the beginning of a cycle for the modern piece

  The portion 27 corresponds to the setting of the model part, its transfer into the tundish, the release of the manipulator 6 and its return; portion 28 corresponds to the rotation of the platform; Portion 29 corresponds

  casting molten metal; portion 30 corresponds to the cooling

  deformation of the casting and extraction of the casting bucket

  ; the portion 31 corresponds to the rotation of the platform

  leading to his initial position; portion 32 is the trans-

  filling the molded part in the cooling tank 13; and the portion 33 corresponds to the cooling of this piece in said

tray 13.

  It goes without saying that the present invention should not be considered

  derive as limited to the embodiment described and shown,

  but covers, on the contrary, all variants.

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Claims (8)

  1 Installation for lost model molding comprising at least four bins for containing granulated material or   at least one furnace for containing a metal in   at least one manipulator suitable for introducing the models into granulated material bins and extracting the parts therefrom.   moldings, and at least one ladle adapted to collect molten metal   in a furnace and to pour it into a tank, characterized in that the tanks 1a, 1b, a and b are arranged in pairs, the two bins of the same pair being carried by a same platform 2a or 2b pivotally mounted relative to a fixed frame, and in that it comprises means for pivoting the platform 2a or 2b at an angle of approximately 1800, the bins being able to   thus occupy a first extreme position and a second position.   extreme position diametrically opposed to the first.   2 Installation according to claim 1, characterized in that it comprises two pairs of bins and two ovens 19a and 19b and a single manipulator-6 which can serve the bins in their first extreme position, and a single ladle 15 that can   serve the ovens and bins in their second extreme position.   3 Installation according to claim 2, characterized in   that the manipulator 6 is pivotally mounted relative to a sup-   fixed port 8 about an axis 9 located equidistant from the axes of the   bins in their first extreme position.   4 Apparatus according to claim 2 or 3, characterized   in that the ladle 15 is pivotally mounted relative to a fixed support 17 about an axis 18 located equidistant from the axes of the furnaces 19a and 19b and the axes of the bins in their second extreme position.   5 Installation according to one of claims 2 to 4,   characterized in that the control circuits are arranged for the manipulator 6 to introduce the model 10 into the bins located   in their first extreme position or extracted the moving parts   12 while the ladle pours the molten metal into   the bins being in their second extreme position.   Installation according to any one of the claims   2 to 5, characterized in that the control circuits are arranged   for both platforms 2 a and 2 b pivoting alternately 6 2540761 -   the time between the two swings being approximately   equal to one quarter of the duration of a work cycle.