US3581805A - Moulding machine with parallel circular wall elements - Google Patents

Moulding machine with parallel circular wall elements Download PDF

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Publication number
US3581805A
US3581805A US769567A US3581805DA US3581805A US 3581805 A US3581805 A US 3581805A US 769567 A US769567 A US 769567A US 3581805D A US3581805D A US 3581805DA US 3581805 A US3581805 A US 3581805A
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Prior art keywords
discs
molding machine
plates
plate
machine according
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US769567A
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Olof Johan Gerhard Hedberg
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Malcus Industri AB
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Malcus Industri AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C17/00—Moulding machines characterised by the mechanism for separating the pattern from the mould or for turning over the flask or the pattern plate
    • B22C17/08—Moulding machines with mechanisms to turn over the pattern plate or the mould around a horizontal axis
    • B22C17/10—Turning-over pattern plate and flask only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only
    • B22C15/14—Compacting by jarring devices only involving pneumatic or hydraulic mechanisms

Definitions

  • a pair of plates are mounted between the dis s arallel to [50] Field of Search 164/37, 39, each other and "OI-ma] [o the discs o f the mates can be ,2 207, 203, moved toward the other and also vibrated or jolted for com- 209 pacting molding sand in a box inserted between the plates either through openings in the discs or in the direction parallel [56] References cued to the discs.
  • the discs together with a box placed between the UNITED STATES PATENTS plates are tumable either into a sand-charging position or a 2,1 12,830 4/1938 Corbin 164/204 sand-compacting position by being supported on rollers 2,570,717 10/1951 Ronceray 1,64/181 mounted on a cradle.
  • 164/192X are separated from these rollers and supported by stationary 2,726,431 12 1955 Ensign et al. 164/39 supports.
  • the present invention relates to moulding machines. Such machines have been known for a long time, and a known such type consists of a vertical beam from which there is a horizontal axle, around which the beam is rotatable. At the ends of the beam there are two arms. On one of the arms a jolt table is arranged with the relevant members for imparting movement to the table parallel with the beam. On the other arm a squeeze head is arranged.
  • the last-mentioned arm is rotatable at the beam, so that the arm can be set in a position above the jolt table and in a position where the jolt table is freely accessible from above.
  • a moulding box is placed on the jolt table.
  • the mould is placed in the box, which is thereafter filled with sand.
  • the table is subjected to a vertical reciprocating movement of a desired amplitude. Thereafter the otherarm is swung in over the moulding box, after which the squeeze headplate is lowered or the jolt table is raised.
  • the above-mentioned moulding machine functions satisfactorily, but it has proved that the arrangement of having a beam and two arms and an axle from the beam is not an ideal solution from the point of view of strength, as the design cannot be made with small dimensions in order to reduce the manufacturing costs. Moreover, the known machine is not sufficiently rapid, which is necessary as the demands for efficiency increase.
  • the purpose of the present invention is to create a moulding machine which, in spite of great stresses, can be made with smaller dimensions than the known machine, and also can carry out moulding very rapidly.
  • the characteristic feature of the present invention is that it consists of two circular discs, which are parallel to each other and located at a distance from each other.
  • the two discs are joined together by means of two parallel transversal connection members.
  • the pressing plate is placed in one of the connection members.
  • the two parallel discs are placed in a cradle, which is provided with members which can turn the two parallel discs around their own center axis.
  • the squeeze plate functions as blocking a member, which can open and close, for a sand pocket, and for which alternative solutions can be conceived for the opening and closing of the pocket.
  • the pressing plate can, for instance, consist of two parts, which can be moved towards or away from each other in the same plane. The parts of the pressing plate can then move in one and the same plane, or can be rotatable around two parallel axes.
  • the pressing plate instead of having a pressing plate with two parts, it is conceivable to have the pressing plate provided with holes which coact with devices that close and open the holes so that the sand can pass through the hole.
  • the two parallel plates can be driven by means of friction rollers. This involves that the peripheral surfaces of the plates must be flat.
  • a second alternative solution is to place a belt, chain, line or the like around one or both of the peripheral surfaces of the plates, the chain or line then being fastened to the peripheral surface of the corresponding plate.
  • the chain or belt is then connected with the driving member, for instance an electric motor or a hydraulic motor, so that the two plates can be made to rotate or turn around their center axis.
  • Another method of causing the two circular plates to rotate is to have one or both of the peripheral surfaces provided with a gear arc, which coacts with gear wheels in the cradle.
  • the gear wheel or wheels are then connected with said driving member.
  • suitable supporting members for the two circular discs are then arranged.
  • the supporting members are intended to coact with the peripheral surfaces of the circular plates, so that when the circular plates are turned to the position desired, the two circular plates can either be lowered down onto the supporting members or a supporting member can be raised up against the peripheral surfaces of the plates.
  • the two circular plates should preferably be at a distance from each other which exceeds the width of a moulding box. This involves that the boxes can be inserted between the two plates in a direction which is at right angles to the axis of the plates.
  • Another possibility of inserting the boxes between the two plates is by making openings in the plates, so that the boxes can be inserted in a direction parallel to the axes of the plates.
  • roller guides can be arranged, so that regardless of in what direction the boxes are inserted into the moulding machine, they can easily be inserted in. the moulding machine.
  • roller guides adjacent to the pressing plate, and then at two diametrically opposite sides.
  • the pressing plate should then appropriately be divided into two parts, which are movable transversally in a direction at right angles to the axis of rotation of the two circular plates.
  • FIG. 1 shows a moulding machine according to the invention shown in perspective and then in an open stage
  • FIG. 2 shows the same moulding machine, in which the squeeze plate of the machine has been displaced by a hydraulic or pneumatic, combined operating, jolt and squeeze device in the machine
  • FIG. 3 shows diagrammatically the bearing and supporting devices of the moulding machine
  • FIG. 4 shows how the moulding machine receives and delivers moulding boxes onto and from the squeeze plate of the machine which is divided into two parts
  • FIG. 5 shows the same device as is shown in FIG.
  • FIG. 6 shows a simplified view of FIG. 5, with the guide in another working phase
  • FIG. 7a shows the moulding box according to FIG. 4, but with the difference that the moulding boxes are inserted and delivered between the two turning discs of the moulding machine
  • FIG. 7b shows examples of the input and output of pattern plates to the machine simultaneously with the input and output of moulding boxes
  • FIG. 8 shows the moulding machine with a moulding box on the pressing plate and the squeeze plate with attached pattern plate moving towards the moulding box, in which FIG.
  • FIG. 9 shows the moulding box held in place between the squeeze plate and the pressing plate of the moulding machine and in which the turning disc device of the'moulding machine is about to complete a l turn
  • FIG. 10 shows the moulding machine in a phase of the turning disc device which is displaced in relation to the phase shown in FIG. I, and after the hydraulic or pneumatic device has lowered the moulding v box in relation to the pressing plate and a filling frame has been placed on top of the moulding box
  • FIG. 11 shows one of the halves of the pressing plate moving out from its position where it is closed with the other half of the pressing plate, so that'a passage for feeding of sand to the moulding box will be formed
  • FIG. 10 shows the moulding machine in a phase of the turning disc device which is displaced in relation to the phase shown in FIG. I, and after the hydraulic or pneumatic device has lowered the moulding v box in relation to the pressing plate and a filling frame has been placed on top of the moulding box
  • FIG. 11 shows one of
  • FIG. 12 shows the moulding machinein the same working phase as in FIG. 11, but with the difference that a sand vessel has been moved up above the moulding machine, in which FIG. 13 shows the halves of the pressing plates returning to their initial position, shown in FIG. 10, in which FIG. 14 shows the moulding machine after the hydraulic or pneumatic device has again moved up the moulding box without filling frame in contact with the pressing plate, in which FIG. shows the moulding box pressed against the pattern plate on the squeeze plate and the pressing plate after the completed moulding operation, in which FIG. I6 shows the moulding machine on the way towards its initial position according to FIG. I, in which FIG. I7 shows a preferred device for achieving the turning movement of the moulding machine, in which FIG.
  • FIG. 18 shows a schematic view of how the turning movement of the moulding machine can alternatively be arranged, in which FIG. I9 shows an embodiment of a supporting device for the turning disc device of the moulding machine, in which FIG. 20 shows a second embodiment of a supporting device together with a bearing device and a driving device, in which FIGS. 21 and 22 show the supporting device according to FIG. 20in two different working phases, in which FIGS. 23 and 24 show a further embodiment ofa supporting device in two different working phases, and in which FIGS. 25 and 26 show a fixed, stationary supporting device coacting with a movable bearing device, schematically as well as in a practical embodiment.
  • FIGS. I and 2 show two turning or rotatable discs I and 2, which are circular and have cylindrical peripheral surfaces.
  • the two discs are parallel to each other on a common axis of symmetry and are located at a distance from each other. Furthermore, they are connected with each other through elements which are described below, and rest together on a frame 3, which, among other members, contains four sliding rollers 4, 5, 6 and 6a and four supports 7, 8, 9 and 9a, as shown in FIG. 3.
  • the two peripheral surfaces of the discs I and 2 rest on said rollers and are located at a certain distance from the four said supports.
  • a driving chain or rope 10 or the like is arranged around one of the peripheral surfaces of the turning discs, viz. around turning disc 1, a driving chain or rope 10 or the like is arranged.
  • Said driving chain 10 is connected with a motor and capable of turning the two discs I and 2 about their common axis of symmetry.
  • a jolting machine II is arranged, in such a way that it forms a structural unit together with the discs.
  • the jolting machine 11 comprises a well-known hydraulic or pneumatic mechanism Ila, which produces a movement (shown by arrow) in a common diametrical plane between and parallel to the sides of the two discs I and 2.
  • the member which produces the movement is usually a piston, to which a squeeze plate I2 is fastened in a known manner. Its squeezing surface is at right angles to the direction of movement of said piston, and is arranged in a known manner to hold a pattern plate 120, as shown, for instance, in FIG. 8.
  • a pressing plate is arranged, which consists of two halves I3 and 14.
  • the division line between the halves I3 and 14 of the pressing plate is arranged to coincide with said diametrical plane between the two turning discs 1 and 2.
  • the two halves l3 and I4 of the pressing plate are displaceable in opposite directions along a plane normal to said diametrical plane through the two turning discs I and 2, as will be noted from FIGS. 11 and 12.
  • conventional bearing members are arranged at the two turning discs, as well as conventional driving mechanisms for producing said movements.
  • the last-mentioned mechanisms are built into a yoke-formed housing 13a, which firmly connects the two turning discs I and 2 to each other at the halves of the pressing plate.
  • the two turning discs I and 2 are thus firmly connected to each other at two places on the two discs which are diametrical in relation to each other.
  • FIG. 2 it is shown how the squeeze plate I2, by means of the jolting machine, can be moved parallel to the two turning discs in said-diametrical plane between the discs, whereby the squeeze plate can be moved towards and away from the pressing plate I3, 14.
  • the pressing plate I3, I4 on the other hand, cannot move in said diametrical plane.
  • the two turning discs I and 2 which are firmly fixed on one side by the jolting machine II and on the other side by the housing 13a, can be turned round the common axis of symmetry of the discs.
  • the turning discs then roll on the previously mentioned sliding rollers 4,5, 6 and 6a.
  • the previously mentioned sliding rollers on the other hand, if they have to absorb the vertical forces which arise, could become damaged.
  • each half of the pressing plate is provided with a roller guide, consisting of a guide I9 with a number of rollers 20.
  • the guide is connected to two arms 21 and 22 or the like which, in turn, are supported at the outer ends of the corresponding halves of the pressing plate, as is shown, in regard to the half 14 of the pressing plate, in FIG. 5.
  • the moulding box 17 is brought to opening 15 by a transportation device which is located in front of the opening.
  • the roller guides 19 are lowered so that the box comes directly into contact with the pressing plate I3, 14, as shown in FIG. 8.
  • the piston of the jolting machine II is set in motion against the moulding box 17, as shown in FIG. 8, so that the moulding box will be squeezed between a pattern plate 120, arranged on the squeeze plate and the pressing plate.
  • the feed of pattern plates to the machine can take place with a shuttle device (not shown), which before a forming cycle feeds a pattern plate 12a for the top part of the moulding box from one side of the machine to the squeeze plate and at the same time removes a pattern plate used in the preceding moulding cycle for the bottom part of a moulding box from the other side of the machine, and thereafter, when the next moulding cycle commences, changing of the pattern plates takes place in the opposite direction, etc.
  • FIG. 10 shows the moulding machine in this position. From FIGS. 9 and I0 it will be clearly noted that the two halves I3 and 14 of the pressing plate at the two turning discs I and 2 are arranged directly under a sand intake 23. As previously mentioned, the two halves I3 and 14 of the pressing plate can be displaced in a direction parallel to the plane of the two turning plates. When the two halves of the pressing plates are pushed together, a pressing plate of the kind shown in FIG. 1 is obtained. The two halves of the pressing plate can assume this position or a position in which they are separated from each other, i.e. the half 13 of the pressing plate has been moved towards the right and the half 14 of the pressing plate towards the left so that there is no bottom in the sand intake 23.
  • the sand intake 23 can be provided in a conventional way with a sand agitator, for spreading and separating the particles of sand which is fed.
  • the squeeze plate 12 is lowered so that there is a certain space between the upper edge of the moulding box and the pressing plate I3, I4.
  • a filling frame 17a can then be placed on top of the moulding box 17.
  • the moulding box can also have an extra height, so that it constitutes a filling frame itself.
  • a sand supply vessel 24, as shown in FIG. 12 is placed above the sand intake. Sand will then, as shown in said figure, be fed to the moulding box.
  • the moulding sand is prejolted or shaken in the moulding box, by the functioning of the jolting machine.
  • the sand intake is closed by the two halves of the pressing plate being returned to the initial position according to FIG. 13 and by coming into contact with each other function as a pressing plate again.
  • the prejolting process is discontinued.
  • the filling frame is them removed from the moulding box and the squeeze plate is raised, so that the sand in the moulding box comes into contact with the pressing plate.
  • the jolting machinery is started anew.
  • the jolting machine imparts to the squeeze plate a motion, the amplitude of which can be varied as required, as is usual, between 1 mm. and 30 mm.
  • the pressing plate is shoulderedin such a way that it has a central part which fits in and can be inserted to a certain extent into the moulding box, as is clearly shown in FIG. 15.
  • the halves 13 and 14 of the pressing plate thus each have a raised part 13a and 14a, and the two raised parts together have a cross-sectional surface corresponding to the size and form of the internal cross section of a moulding box. Due to the raised parts 130 and 14a, efficient compression of the sand 26, with which the moulding box is filled, is obtained.
  • the pattern plate 12a the pattern of the part which is subsequently to be cast is shown. When the predetermined pressing force on the sand in the moulding box has been obtained, the jolting procedure is discontinued.
  • FIG. 14 shows the moulding machine in its state, when the moulding box after the completed moulding procedure is pressed between the pattern plate on the squeeze plate 12 and the pressing plate I3, 14, as shown in FIG. 15. With the moulding box still retained between the squeeze plate and the pressing plate, the two turning discs are turned back to their initial position in FIG. 1.
  • FIG. 16 shows the moulding machine during this movement
  • FIG. 17 shows the moulding machine when the squeeze plate, after the pressing force has been released, is being raised, after the moulding machine has returned to the position first shown in FIG. I. In this position the completely processed box is removed from the pressing plate, and a new moulding box is fed to it, after which the above-mentioned working cycle is repeated.
  • FIG. I shows two driving chains 10 for turning the discs, but it should be obvious that one chain may be used for turning both discs.
  • FIG. 18 a solution is shown, schematically, how the tuming of the disc I may be accomplished.
  • a chain is laid around the periphery of the disc 1, so that there is a strong friction force between the peripheral sur face and the chain.
  • the chain is driven by a motor 25, which has a shaft 26, provided with a driving pulley 27, which bears against the chain 10.
  • the chain is kept taut against the driving pulley 27, and a tension or idling pulley 32 is supported at a fixed position at a distance from the driving pulley 27 with the aid of two tension or idling pulleys 28 and 29, which are each arranged in a fixed position on arms 30 and 31, respectively.
  • the arms 30 and 31 each have one end supported in a fixed position, and are actuated by a pressure force, for instance supplied by a spring (not shown) so that the driving chain 10 is kept bearing with an appropriate tension against the disc I as well as against the driving-pulley 27 and the idling or tension pulley 32.
  • a link chain 10' as shown in FIG. 20.
  • the chain coacts with a sprocket 37, which is driven by a gear wheel 27', which coacts with a gear are on said sprocket 37.
  • the gear wheel 27 is fixed to the shaft 26 of a driving motor 25'.
  • the chain 10' coacts with teeth onthe peripheral surface of the turning disc 1.
  • Chain operation for turning disc 1 is also shown in FIG. 5.
  • the chain is placed in a different way, which is shown in more detail in FIG. 25, andcoacts with a sprocket 37, which is connected with the previously mentioned motor 25'.
  • a further alternative for driving the turning disc unit is that the peripheral surface of one or both of the turningdiscs has such properties that it can coact with driving rollers acting upon the peripheral surface.
  • a particularly favourable alternative is, in accordance with FIG. 17, to drive the turning discs by means of a hydraulic or air cylinder 44, which has one end of the cylinder supported so that it can pivot on a pivot journal 45 which has a fixed position in relation to the turning discs and has the end of the piston rod supported on'a pivot journal 46 which is fixed to the inside or the outside of a turning disc near its periphery and on a horizontal diameter of same when it is in its two fixed work ing positions.
  • a turning device is shown acting upon the turning disc 1, but it will be understood that, at the same time, the turning disc 2 can also be arranged for turning in the same way.
  • the turning cylinder 44, in FIG. 17 is shown anchored by a pivot journal 45 in the base under the machine, the anchoring can be arranged both at the side of and above the machine.
  • FIG. 19 shows supporting member 7, which is arranged on a piston 34, which is movable in a hydraulic cylinder, and also sliding roller 4.
  • the hydraulic cylinder is caused to work so that the piston 34 is raised sufficiently so that the supporting member 7 comes into direct contact with the peripheral surface of the turning disc I, at the same time as the sliding roller loses its contact with said surface. In this situation the jolting machine can function without the sliding roller 4 being damaged.
  • stopping members for instance the stopping member 3', indicated in FIG. 19, can be arranged.
  • the stopping member should then appropriately, as shown in the figure, act against a protrusion in the periphery of the turning disc, for instance a peripheral flange so that turning disc is clamped between the support and said stopping member.
  • a yoke-formed fixed connection (not shown) can be arranged peripherally between the two turning discs 1 and 2 in their lowermost parts, when they are in the position for the jolting phase of the moulding cycle.
  • Said yoke then coacts with a stopping member (not shown) fixed to the base and protruding up between the turning discs, for instance a column provided with a head, in such a way that when the supports 7, 8, 9 and 9a and together with these the turning discs 1 and 2 are raised before the jolting phase, the discs are stopped in a predetermined vertical position in which said yoke will be arrested against the head of said column.
  • the stopping members described can, of course, be provided with stopping buffers in a common, known way.
  • FIGS. 20, 21 and 22 a further alternative of a support, similar to the one in FIG. 19, is shown.
  • the support has been given the reference designation 7.
  • the support is arranged on an arm 35, which has one of its ends fixed and between its ends is actuated by an eccentrically supported wheel 36.
  • the support 7' is not in contact with the turning disc I, but the turning disc is in contact with the sliding roller 4, while on the other hand, in the position in which the wheel 36 is shown in FIG. 22, the support is directly in contact with the turning disc 1 in such a way that the turning disc is out of contact with the corresponding sliding roller so that the jolting machine can begin to function.
  • FIGS. 23 and 24 another embodiment of the support is shown.
  • the support 7" consists of an eccentrically supported wheel. In the position which the wheel 7" has in FIG. 23, it is out of function, and the turning disc is resting on the sliding roller 4. In the position which the wheel 7" has in FIG. 24, it is functioning as a supporting member and the sliding roller 4 is out of function.
  • FIGS. -24 can be combined with supporting devices as in the case of what is described in conjunction with FIG. 19.
  • FIGS. 25 and 26, finally, show a fixed support 7', with which sliding rollers 4" coacting with the turning disc can be moved towards or away from the turning disc in such a way that in one position the turning disc is in contact with the sliding roller at the same time as the turning disc is out of contact with the support 7' and in another position out of contact with the turning disc 1, the turning disc then being in contact with the support.
  • FIG. 25 shows with solid lines the roller in contact with the turning disc 1, the turning disc 1 then being out of contact with the support 7, and in dashed lines the sliding roller 4" out of contact with the turning disc 1, the turning disc then being in contact with the support 7.
  • FIG. 26 shows an arrangement for moving the roller 4" into and out of contact with the turning disc according to the foregoing.
  • the roller 4 is supported in one end of an arm 38, which has its other end supported at the support 7. Between the two ends of the arm 38 one end of an arm 40 is supported, and the other end is connected with one end of a movable part 42 ofa hydraulic device 43, which is supported in a fixed position.
  • the arm 41 is also movable supported on the support 7'.
  • a molding machine for compacting loose molding material in a mold box comprising in combination:
  • a cradle for supporting said discs rotatable relative thereto;
  • a first drive means coacting with at least one of said discs for rotating the same about said common rotational axis either into an angular position for compacting molding material in a mold box or into an angular position for charging a mold box with molding material;
  • vibrating means coupled to one of said plates and operable for imparting vibrations to said one plate.
  • said cradle includes rollers rotatably engageable with a lower peripheral portion of at least one of said discs.
  • said first drive means comprises a transmission means encompassing a major portion of the peripheral wall of at least one of said discs, and a power-driven member drivingly coupled to said transmission means.
  • said first drive means comprises a gear train including a powerdriven gear and a chain in mesh with said gear and encompassing a part of the peripheral wall of at least one of said discs in rotation-transmitting engagement.
  • said first drive means comprises a hydraulically operated drive means including a cylinder pivoted at one end to a stationary support and a piston rod reciprocating in said cylinder, the free end of said piston rod being hinged to at least one of said discs thereby imparting to the discs an angular movement as the piston rod reciprocates.
  • said cradle includes rollers engageable with a lower peripheral por tion of the discs for rotatable supporting the same, means for selectively raising and lowering said rollers into and out of engagement with said discs, and fixed support means on the eradle, said support means being positioned to support the discs when the rollers are lowered relative to the discs and the support means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Stacking Of Articles And Auxiliary Devices (AREA)
  • Casting Devices For Molds (AREA)
US769567A 1967-10-30 1968-10-22 Moulding machine with parallel circular wall elements Expired - Lifetime US3581805A (en)

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SE14854/67A SE324039B (enrdf_load_stackoverflow) 1967-10-30 1967-10-30

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US (1) US3581805A (enrdf_load_stackoverflow)
DE (1) DE1800751A1 (enrdf_load_stackoverflow)
ES (1) ES359648A1 (enrdf_load_stackoverflow)
FR (1) FR1587212A (enrdf_load_stackoverflow)
GB (1) GB1242557A (enrdf_load_stackoverflow)
SE (1) SE324039B (enrdf_load_stackoverflow)

Cited By (2)

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US20080023170A1 (en) * 2006-07-25 2008-01-31 Metal Casting Technology, Inc. Method of compacting support particulates
EP1944104A1 (en) 2007-01-10 2008-07-16 Metal Casting Technology, Inc. Method of Compacting Support Particulates

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DE3050260C2 (de) * 1980-02-01 1984-07-19 Vsesojuznyj naučno-issledovatel'skij institut litejnogo mašinostroenija, litejnoj technologii i avtomatizacii litejnogo proizvodstva, Moskva Automatische Sandslingerformmaschine

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US2867870A (en) * 1956-10-05 1959-01-13 Hines Flask Company Method and apparatus for making sand molds for castings
US2887741A (en) * 1954-10-11 1959-05-26 Flexonics Corp Shell molding apparatus
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US2112830A (en) * 1938-04-05 Molding machine
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DE337748C (de) * 1920-01-23 1921-06-09 Voss Sen Fa A Unterboden fuer kastenlose Formen
GB253453A (en) * 1926-01-22 1926-06-17 New Process Multicastings Co Improvements in processes for making foundry moulds
US2570717A (en) * 1948-04-23 1951-10-09 Ronceray Robert Andre Marcel Machine for the continuous manufacture of casting molds
US2726431A (en) * 1951-12-15 1955-12-13 Ford Motor Co Process for producing a sand-resin molding member by vibrating
US2746104A (en) * 1952-10-24 1956-05-22 Emery I Valyi Apparatus for producing shell molds
US2724158A (en) * 1952-11-22 1955-11-22 Budd Co Apparatus for making mold shells
US2830337A (en) * 1954-07-01 1958-04-15 Int Harvester Co Investment machine for making shell molds
US2887741A (en) * 1954-10-11 1959-05-26 Flexonics Corp Shell molding apparatus
US2867870A (en) * 1956-10-05 1959-01-13 Hines Flask Company Method and apparatus for making sand molds for castings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080023170A1 (en) * 2006-07-25 2008-01-31 Metal Casting Technology, Inc. Method of compacting support particulates
US7735543B2 (en) * 2006-07-25 2010-06-15 Metal Casting Technology, Inc. Method of compacting support particulates
EP1944104A1 (en) 2007-01-10 2008-07-16 Metal Casting Technology, Inc. Method of Compacting Support Particulates
CN101269403B (zh) * 2007-01-10 2011-06-08 金属铸造技术公司 压实支撑微粒的方法

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SE324039B (enrdf_load_stackoverflow) 1970-05-19
FR1587212A (enrdf_load_stackoverflow) 1970-03-13
DE1800751A1 (de) 1969-06-19
ES359648A1 (es) 1970-06-16
GB1242557A (en) 1971-08-11

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