JP2009214158A - Die moving type gravity casting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide die moving type gravity casting equipment which improves feeding capacity, so as to suppress the generation of shrinkage cavity, and can cast a cast product of high quality at a high yield in a short solidification time, and in which equipment cost is low and energy consumption is reduced. <P>SOLUTION: Disclosed is die moving type gravity casting equipment 1 comprising: a gravity casting die 30 supplying a molten metal 3 by gravity; and moving type casting equipment 10 circulating the gravity casting die 30, so as to perform casting, wherein, after the molten metal 3 is poured into the gravity casting die 30 by a tilt apparatus 13, utilizing driving force transferring the gravity casting die 30 by a transferring apparatus 19 and gravity, the feeding operation of the gravity casting die 30 is performed, and, utilizing rotating force rotating the gravity casting die 30 by a tilt returning apparatus 16 and gravity, a tilt returning operation is performed, and the gravity casting die 30 is returned to a rotating position in a state before the tilt by the tilt apparatus 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a die moving type gravity casting facility in which a die is cast using gravity while moving on a line, and more particularly to a feeder bath that suppresses shrinkage nest generation.

  As a casting device related to the molten metal for suppressing shrinkage generation in the prior art, a molten metal filling device for filling the cavity with the molten metal and a molten metal intrusion region where the molten metal enters when the molten metal enters the cavity are formed together with the cavity. A molten metal detecting means for directly detecting whether or not there is a molten metal in the cavity or the molten metal intrusion region, and a molten metal transmitted from the molten metal detecting means when the molten metal detecting means detects the presence of the molten metal. There is disclosed a molten metal apparatus having pressurizing means for locally pressurizing a molten metal filled in a cavity before the molten metal solidifies based on a detection signal. The pressurizing means of the molten metal apparatus has a local pressure pin and locally pressurizes the molten metal filled in the cavity with the local pressure pin based on the molten metal detection signal (see, for example, Patent Document 1). .)

Further, as a conventional mold moving casting mold facility, a hot water supply device for supplying molten metal to the mold, a tilting device for inclining the mold to which the molten metal is supplied and filling the mold with the molten metal, and filling are provided. In the mold moving casting equipment, which is connected to the cooling device for solidifying the molten metal by the transfer device and casting while circulating the mold, this line that circulates the mold and the sub-line separately from this line A mold moving type mold facility is disclosed in which a subline is disposed between a hot water supply device and a take-out device (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 2004-202520 Japanese Patent Laid-Open No. 2003-10963

  However, according to Patent Document 1, the molten metal filled in the cavity is locally pressurized by the local pressurizing pin and the hot water is carried out to suppress the formation of shrinkage nests. In order to drive, a pressurizing device, a control device for the pressurizing device, and a molten metal detection sensor for detecting the presence or absence of the molten metal are required. For this reason, there is a problem that the equipment cost increases and a problem that a relatively large energy is required for each shot because the local pressure pin is driven.

  Further, according to Patent Document 2, the mold movable casting mold facility is provided with a sub-line separately from the main line and the main line to improve the productivity of the facility and the operating rate. Since nest suppression is not performed, there is a problem that the yield is low and the coagulation time is long.

  The present invention has been made in view of the above-mentioned problems, and can improve the feeder capacity, suppress the generation of shrinkage nests, and can cast a cast product with high quality, high yield, short solidification time, and equipment. The object is to provide a die moving gravity casting facility that is inexpensive and consumes less energy.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a mold movement comprising: a gravity casting mold to which a molten metal is supplied; and a mobile casting facility that performs casting by circulating the gravity casting mold. And a tilting device that tilts the gravity casting mold to pour the molten metal into the gravity casting mold, and cools the gravity casting mold to solidify the poured molten metal. The gravity casting mold is connected by connecting a cooling device, a tilting return device for returning the tilted gravity casting mold to its original rotational position, the tilting device, the cooling device, and the tilting return device. A first guide rail disposed between a transporting device for transporting and the tilting device cooling device; and a second guide rail disposed on the tilting return device or the tilting return device, the gravity casting The mold forms a cast product inside the gravity casting mold. An upper mold that has a cavity and forms one of the cavities; a lower mold that abuts the upper mold to form the other of the cavities; and the cavity when the upper mold and the lower mold abut A pressurizing hole that communicates with the outside of the gravity casting mold, a pressurizing pin that moves inside and outside the pressurizing hole, and a pressurizing plate that is integrally fixed to an end of the pressurizing pin; A shutter that is disposed on the upper mold and moves in a reciprocating manner on the side surface of the upper mold, the pressure plate has a first slide portion on a fixing surface with the pressure pin, and the shutter A first force receiving member that has a second slide portion on a contact surface with the one slide portion, is fixed to the pressure plate, and extends in a forward / backward direction and an orthogonal direction of the pressure pin; and the shutter A second force receiving member fixed and extending in a direction coaxial with the advancing and retreating direction of the pressure pin; The second force receiving member abuts on the first guide rail while the gravity casting mold is being transferred from the tilting device to the cooling device by the transfer device, and the first guide rail is The pressure plate stop shutter is slid in a direction away from the pressure plate, the pressure plate is dropped, the second slide portion is detached from the first slide portion, and the gravity casting mold is being tilted back by the tilt return device. The first force receiving member abuts on the second guide rail, the second guide rail moves the pressure plate in a direction away from the feeder hole, and drops the pressure plate stop shutter to form a second. The slide part is brought into contact with the first slide part.

  In the invention according to claim 2, the pressurizing force of the hot water by the pressure pin is adjusted by the weight of the pressure pin and the weight of the pressure plate.

  According to a third aspect of the present invention, the pressurizing timing of the pressurizing pin with the hot water is adjusted at a position where the first guide rail is disposed between the tilting device and the cooling device.

  According to a fourth aspect of the present invention, the pressure pin includes a pressure pin head made of either ceramic or heat-resistant glass that pressurizes the molten metal of the gravity casting mold, one end connected to the pressure pin head, and the other end. A coupling member coupled to the pressure plate.

  In the invention according to claim 5, the pressure pins are in line contact with the inner peripheral surface of the feeder hole at three locations.

  Moreover, the invention of Claim 6 is provided with a plurality of feeder holes, and is a long hole in the direction in which the arrangement distance is long among adjacent feeder holes.

  In the first aspect of the present invention, the mold moving casting equipment is tilted to a predetermined angle (for example, 90 degrees) by a tilting device, and a gravity casting mold (hereinafter referred to as a mold) is melted using gravity. In the middle of transferring the mold from the tilting device to the cooling device by the transfer device, the first guide rail against which the first force receiving member hits is arranged. In addition, the mold moving casting equipment has a process in which the mold is cooled by the cooling device and the molten metal is solidified, and then the mold is tilted by the tilting return device and returned to the state before being tilted by the tilting device. 2 The 2nd guide rail which a force receiving member contacts is arranged.

  The hot water hole formed by contacting the upper mold and the lower mold is located above the cavity during tilting. The first slide portion provided on the pressure plate is a cross section orthogonal to the direction in which the mold toward the cooling device is transferred, and is inclined in a direction approaching the feeder hole with respect to the dropping direction. Accordingly, the mold is tilted to a predetermined angle (for example, approximately 90 degrees) by the tilting device and poured with the pressurizing plate stop shutter preventing the pressure plate from dropping.

  After the end of tilting and pouring, while the mold is being transferred from the tilting device to the cooling device by the transfer device, the second force receiving member comes into contact with the first guide rail and moves along the first guide rail. The second slide part slides on the first slide part using the force by which the mold is moved. When the second slide part slides, the pressure plate and the pressure pin connected to the pressure plate fall by their own weight, pressurize the molten metal in the hot water hole with the total weight of the pressure pin and the pressure plate, and the hot water is performed. . By pushing the molten metal in the mold, the occurrence of shrinkage cavities of the workpiece, which is a cast product cast into the cavity of the mold, is suppressed.

  After the mold is cooled by the cooling device and the molten metal in the mold is solidified, the mold is transferred to the tilt return device by the transfer device, is tilted by the tilt return device, and is in the rotational position before the tilt by the tilt device. Returned. The first force receiving part material hits the second guide rail during the tilting return to return the mold to the original rotational position by the tilting return device. At this time, the pressure plate receives the force from the second guide rail using the rotational force by which the mold is tilted, and moves together with the pressure pin in the direction of coming out of the feeder hole. When the pressure plate moves, the pressure plate stop shutter falls by its own weight, and the second slide portion slides on the first slide portion to return the pressure plate and the pressure pin to their original positions before tilting by the tilting device. The hopper also returns to the original position before tilting by the tilting device.

  As described above, the hot water work is performed using the force that moves the mold by the transfer device, the rotational force that rotates the mold by the tilt return device, and gravity. An apparatus and a control device for a pressurizing device are not required, and a die moving type gravity casting facility with low equipment cost and low energy consumption can be provided as compared with the prior art.

  Further, since the hot water is pressed using the weight of the pressure pin and the pressure plate, it is possible to provide a mold moving type gravity casting facility capable of casting a cast product with high quality, high yield and short solidification time.

  In the second aspect of the invention, the pressure of the molten metal in the mold by the pressure pin can be adjusted to a pressure suitable for the mold and the workpiece by the weight of the pressure pin and the weight of the pressure plate. , The hot water capacity is improved. As a result, it is possible to provide a mold-movable gravity casting facility capable of casting a cast product with high quality, high yield, and short solidification time.

  In the invention according to claim 3, the pressurizing timing of the hot water by the pressurizing pin is adjusted to adjust the position where the first guide rail is disposed between the tilting device and the cooling device, thereby generating shrinkage nests. Since the pressurizing timing of the hot water that is most effectively suppressed can be determined, the hot water capacity is improved. As a result, it is possible to provide a mold moving gravity casting facility capable of casting a cast product with improved suppression of shrinkage nests, high quality, high yield, and short solidification time.

  According to a fourth aspect of the present invention, the pressure pin is a connection that connects the pressure pin head and the pressure plate with a pressure pin head made of either ceramic or heat-resistant glass that pressurizes the molten metal in the mold cavity. A member is provided. Since the thermal conductivity of ceramic and heat-resistant glass is lower than that of metal, the pressure pin head becomes a heat insulator, and the heat released from the connecting member through the pressure pin head from the molten metal that gets wet with the pressure pin head Reduced compared to metal. Moreover, since the heat capacity per volume of the ceramic and the heat-resistant glass is smaller than that of metal, the heat of the pressure pin head heated by the molten metal is reduced compared to that of metal. As a result, when pressing hot metal with a pressure pin, the directional solidification of the molten metal in the cavity is suppressed, the suppression of shrinkage nest generation is improved, and the die-movable gravity casting equipment that can cast high-yield casting products. Can be provided.

  Moreover, since the pressure pin is made of ceramic or heat-resistant glass only in the head where the molten metal gets wet, it can be made cheaper than the case where the entire pressure pin is made of ceramic or heat-resistant glass, so the cost of the mold moving gravity casting equipment is low. Become.

  Further, in the invention according to claim 5, since the pressure pins are in line contact with the inner peripheral surface of the feeder hole, the pressure pins can be dropped smoothly in a substantially vertical direction without squeezing. This makes it possible to perform a stable hot-water work. As a result, the suppression of shrinkage nests is improved, and a mold moving gravity casting facility capable of casting a cast product with high quality and high yield can be provided. Further, the reliability of the mold moving gravity casting equipment is improved.

  In the invention according to claim 6, a plurality of feeder holes are provided and are elongated holes in a direction in which the arrangement distance is longer among adjacent feeder holes. During casting, the mold becomes hot (for example, approximately 600 degrees) and thermally expands, and the distance between the feeder holes also increases due to the thermal expansion. On the other hand, since the pressure plate is in a room temperature atmosphere, the distance between the pressure pins hardly expands. Therefore, the distance between the feeder holes differs from the distance between the pressure pins due to the effect of thermal expansion, but the feeder holes are elongated in the distance direction between the feeder holes, so It can drop smoothly in the vertical direction without hitting the hot water hole, and a stable hot-water work with the pressure pin is possible. As a result, the suppression of shrinkage nests is improved, and a mold moving gravity casting facility capable of casting a cast product with high quality and high yield can be provided. Further, the reliability of the mold moving gravity casting equipment is improved.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram of a mold moving gravity casting facility according to Embodiment 1 of the present invention. The mold moving gravity casting equipment 1 includes a gravity casting mold 30 in which molten metal is supplied to the mold using gravity, and a mobile casting equipment 10 that performs casting while circulating the gravity casting mold 30. .

  FIG. 2 is an explanatory diagram of a gravity casting mold, and shows a state where the molten metal supply to the hopper by the hot water supply robot has been completed. In the figure, (a) is a top view, and (b) is a view taken in the direction of arrow A in (a). As shown in FIG. 2, the gravity casting mold 30 includes a mold body 31 in which an upper mold 32 and a lower mold 33 are combined, a hopper 36, a pressure pin 37, a pressure plate 38, and a pressure plate stopper. And a shutter 40.

  The hopper 36 is fixed to the mold body 31 in order to temporarily store the molten metal 3 to be cast into the cavity 34. The molten metal 3 stored in the hopper 36 is supplied by the molten metal 2 in the holding furnace 11 being rubbed by the handle 12 a of the robot 12 for hot water supply.

  The mold body 31 includes a cavity 34 in which a two-piece casting product is cast, a molten metal supply port 42 into which the molten metal 3 is cast into the cavity 34, and a hot water communicating with the cavity 34 in order to suppress the formation of shrinkage. A hole 35 is provided. Since the molten metal supply port 42 and the pusher hole 35 have two molds, two are provided. The feeder hole 35 is located above the cavity 34 when the gravity casting mold 30 is tilted.

  A pressure pin 37 that is movable in the axial direction of the hot water hole 35 is inserted into each of the two hot water holes 35. One end side of the pressure pin 37 gets wet with the molten metal 3 in the hot water hole 35, and the other end side is screwed into the pressure plate 38, and the movement of the pressure plate 38 is transmitted to the two pressure pins 37.

  The pressure pin 37 and the pressure plate 38 are fixed by screw connection, but may be flexible connection as long as the movement of the pressure plate 38 and its own weight can be transmitted to the pressure pin 37.

  On both end portions 38a, 38b side of the pressure plate 38, a first slide portion 38c on which a pressure plate stopper shutter 40 described later slides is provided. In a state where the pressure plate stopper shutter 40 is detached from the first slide portion 38 c, the pressure plate 38 can move in the axial direction of the hot water hole 35 in a direction approaching the hot water hole 35. In addition, the 1st slide part 38c is a cross section orthogonal to the direction where the gravity casting die 30 toward the cooling device 15 is transferred, and inclines in the direction approaching the feeder hole 35 with respect to the falling direction.

  Further, a pressure plate guide pin 39 (first force receiving member) is disposed on the side surface of the end portion 38 a of the pressure plate 38. When the pressure plate guide pin 39 (first force receiving member) hits the first guide rail 14 provided in the mobile casting equipment 10 to be described later, the pressure plate 38 receives a force from the first guide rail 14, and the pressure plate 38 has the feeder hole 35. It moves in the direction away from the feeder hole 35 in the axial direction.

  The pressure plate stopper shutter 40 is movable in the Z direction (X direction in FIGS. 3 and 6) in FIG. 2B, and the side surface 32 a of the upper mold 32 of the mold body 31 and the side surface of the lower mold 33. 33a. A second slide portion 40c is provided on both ends 40a and 40b of the pressure plate stopper shutter 40. The second slide portion 40c is slidable with respect to the first slide portion 38c when the first slide portion 38c of the pressure plate 38 comes into contact therewith.

  Further, a shutter guide pin 41 (second force receiving member) is disposed at the center of the pressurizing plate stopper shutter 40, and the shutter guide pin 41 hits the second guide rail 17 provided in the mobile casting equipment 10 described later. When hit, the shutter guide pin 41 receives a force for moving the pressure plate stopper shutter 40 from the second guide rail 17, and the pressure plate stopper shutter 40 moves in a direction away from the hot water hole 35. This operation is performed in a hot water process described later after the end of tilting and pouring.

  FIG. 3 is an explanatory view of the operation of the pressure plate stopper shutter 40 in the hot water process. In the figure, (a) shows a state immediately before the pressure plate stopper shutter 40 starts to move. (B) shows a state in which the pressure plate stopper shutter 40 is moving. The pressure plate stop shutter 40 moves in the X direction, and both the pressure plate 38 and the pressure pin 37 connected to the pressure plate 38 fall by their own weight. FIG. 3 is a view obtained by rotating FIG. 2B counterclockwise by 90 degrees.

  As shown in FIG. 1, the mobile casting facility 10 includes a holding furnace 11, a hot water supply robot 12, a tilting device 13, a first guide rail 14, a cooling device 15, a tilting return device 16, and a second It comprises a guide rail, a product take-out robot 18 and a transfer device 19.

  The holding furnace 11 is a furnace for holding a molten metal 2 (for example, aluminum, aluminum alloy, etc.) to be cast into the gravity casting mold 30 within a predetermined temperature range. The hot water supply robot 12 scoops the molten metal 2 in the holding furnace 11 with the handle 12a, and supplies the molten metal 3 to a hopper 36 that is kept substantially horizontal. FIG. 4 is a diagram showing a state where the molten metal supply to the hopper 36 by the hot water supply robot 12 is completed. In the figure, (a) is a top view, and (b) is a view taken in the direction of arrow A in (a). The tilting device 13 tilts the gravity casting mold 30 in a state where the molten metal 3 of the handle 12a is supplied by the hot water supply robot 12 to a predetermined angle (for example, 90 degrees), and the molten metal 3 of the hopper 36 is moved to the molten metal supply port 42. Then, the cavity 34 and the feeder hole 35 are cast using gravity. FIG. 5 is a view showing a state in which the molten metal supply to the gravity casting mold 30 by the tilting device 13 is completed, and the gravity casting die 30 in the tilting device 13 of FIG. 1 shows this state. In the figure, (a) is a top view, and (b) is a view taken in the direction of arrow B in (a).

  The first guide rail 14 is disposed between the tilting device 13 and the cooling device 15 in order to perform a hot water work using a driving force for transferring the gravity casting mold 30 from the tilting device 13 to the cooling device 15. The first guide rail 14 includes a guide rail portion 14 a that applies a slide driving force to the shutter guide pin 41 and a support portion 14 b. In the guide rail portion 14a, when the gravity casting mold 30 moves in the Y direction, the shutter guide pin 41 hits the guide rail portion 14a. The support portion 14b is provided to fix the guide rail portion 14a at a predetermined position. FIG. 6 shows a state in which the first guide rail 14 has acted and the hot water work described later has been completed. In the figure, (a) is a top view, and (b) is a C arrow view of (a).

  The cooling device 15 is provided to cool the gravity casting mold 30 to a predetermined temperature after the pressurizing operation is completed and to solidify the molten metal 3 in the gravity casting mold 30. The direction in which the gravity casting mold 30 is placed during cooling is the same as the arrangement direction shown in FIG. 5 or FIG.

  After the cooling of the gravity casting mold 30 is finished, the tilting return device 16 is configured so that the gravity casting mold 30 tilted to a predetermined angle (for example, 90 degrees) by the tilting device 13 is the gravity casting mold before the tilting by the tilting device 13. Deployed to tilt back to 30 rotational positions.

  The second guide rail 17 is disposed in the vicinity of the tilt return device 16 or the tilt return device 16 in order to return the positions of the pressure plate 38, the pressure pin 37, and the pressure plate stop shutter 40 to the positions before the tilt by the tilt device 13. The The second guide rail 17 includes a guide rail portion 17a for applying a slide driving force to the pressure plate guide pin 39, and a support portion 17b for fixing the guide rail portion 17a at a predetermined position. When the tilt return work is completed, the return work of each position of the pressure plate 38, the pressure pin 37, and the pressure plate stop shutter 40 is also completed. FIG. 7 shows a state where the tilt return device 16 is tilted and the second guide rail 17 is actuated, and is a view seen from the direction C in FIG.

  The product take-out robot 18 is arranged to open the gravity casting mold 30 after the end of the tilt return work by the heavy tilt return device 16 and take out the workpiece 6 which is a solidified cast product.

  The transfer device 19 includes a hot water supply by the hot water supply robot 12 and a casting process by the tilting device 13, a hot water supplying process by the first guide rail 14, a cooling process by the cooling device 15, a tilt return device 16 and a second guide rail 17. Are provided in order to sequentially connect the tilt return process by the cooperation of the product, the product take-out process by the product take-out robot 18, and the mold transport process for sending the gravity casting mold 30 to the next shot. The product take-out robot 18 is configured to connect the conveyors 19a, 19b, 19c, 19d, 19e, and 19a that are electrically operated, and the gravity casting mold 30 circulates.

  In FIG. 1, the gravity casting mold 30 in the heavy tilt return device 16 is a view seen from above the mold moving gravity casting equipment 1.

  Next, the operation and effect of Embodiment 1 of the present invention will be described.

  The casting process of the workpiece 6 by the mold moving gravity casting equipment 1 is sequentially formed by a casting process, a hot water process, a cooling process, a tilt return process, a product take-out process, and a mold conveying process. . 4 to 7 show a state of a series of casting processes.

  (Casting process) The molten metal 2 in the holding furnace 11 is scooped by the handle 12a of the hot water supply robot 12 and supplied to the hopper 36 kept substantially horizontal (FIG. 4). After that, as shown in FIG. 5, the tilting device 13 is operated while preventing the pressure plate 38 from falling by its own pressure with the pressure plate stop shutter 40, and the gravity casting mold 30 is moved to a predetermined angle (for example, 90 degrees). Tilt and cast the molten metal 3 in the hopper 36 from the molten metal supply port 42 of the gravity casting mold 30 into the cavity 34 and the feeder hole 35 by gravity.

  (Push-up process) After completion of the casting process, as shown in FIGS. 1 and 6, the gravity casting mold 30 is placed on the conveyor 19a and moves in the Y direction, and the shutter guide pin 41 of the pressure plate stopper shutter 40 is the first. It hits the guide rail portion 14a of the guide rail 14. Subsequently, the shutter guide pin 41 moves along the first guide rail 14 by the force of the gravity casting mold 30 moving. Due to the movement of the shutter guide pin 41, the second slide part 40c that is in contact with the first slide part 38c moves in the X direction while sliding the first slide part 38c (FIG. 3), and from the first slide part 38c. Detach. When the second slide portion 40c slides on the first slide portion 38c, the pressure plate 38 and the pressure pin 35 gradually drop due to the action of gravity, and when detached from the first slide portion 38c, the pressure plate 38 and the pressure pin 35 Falls at once. At this time, the total weight of the pressure pin 35 and the pressure plate 38 acts on the molten metal 3 in the gravity casting mold 30 to be pressurized, and the hot water operation is performed, and the generation of shrinkage cavities in the cavity 34 is suppressed. A gap is formed between the bottom surface 38 d of the pressure plate 38 and the side surface 33 a of the lower mold 33, and the molten metal 3 in the gravity casting mold 30 supports the total weight of the pressure pin 35 and the pressure plate 38.

  When the guide rail portion 14a hits the shutter guide pin 41, the shutter guide pin 41 moves in the X direction away from the pressure plate 38 with respect to the guide rail portion 14a and the Y direction in which the gravity casting mold 30 moves. The shutter guide pin 41 is inclined with respect to the Y direction so as to move also in the X direction (the Z direction in FIG. 2) away from the pressure plate 38. That is, the angle α between the X direction in which the shutter guide pin 41 is separated from the pressure plate 38 and the guide rail portion 14a is set to be larger than 90 degrees and smaller than 180 degrees.

  (Cooling process) After the hot metal operation is completed, the cooling device 15 cools the gravity casting mold 30 and the molten metal 3 in the gravity casting mold 30 to a predetermined temperature, and solidifies the molten metal 3.

  (Tilt return step) The tilt return device 16 tilts and returns to the rotational arrangement of the gravity casting mold 30 before the tilt by the tilt device 13. Further, the pressure plate guide pin is applied to the second guide rail 17 by using the rotational force of the return tilt and gravity, so that the pressure plate stop shutter 40, the pressure plate 38, and the pressure pin 37 are not tilted by the tilt device 13. Return to the position (FIG. 7). That is, the pressure plate guide pin 39 of the gravity casting mold 30 hits the guide rail portion 17 a of the second guide rail 17 while the gravity casting mold 30 is tilted back. The pressure plate guide pin 39 receives the rotational force due to the tilt of the gravity casting mold 30 and moves along the guide rail portion 17 a of the second guide rail 17. By this movement, the gap H between the pressure plate 38 and the side surface 32a of the upper mold 32 is expanded, the pressure plate stop shutter 40 falls by its own weight, and the second slide portion 40c passes through the gap H and the first slide portion 38c. Is brought into contact with the first slide portion 38 c of the pressure plate 38.

  The guide rail portion 17a is inclined downward in the rotational direction of the return tilt. That is, an angle β formed by the W direction in which the gravity casting mold 30 moves and the guide rail portion 17a is formed is an acute angle in a rotation direction R in which the gravity casting mold 30 is tilted.

  (Product Extraction Process) After the tilt return process is completed, the gravity casting mold 30 is opened, and the solidified workpiece 6 is extracted by the product extraction robot 18.

  (Mold Conveying Step) The gravity casting die 30 from which the workpiece 6 has been taken out is placed on the conveyor 19e and conveyed to the casting process of the next shot. In this process, the gravity casting mold 30 is tilted by the tilting device 13 of the gravity casting mold 30 so that the rotational arrangement of the gravity casting mold 30 and the positions of the pressure plate stopper shutter 40, the pressure plate 38 and the pressure pin 37 are adjusted. Returning to the previous state, the cavity 34 is also in an empty state from which the workpiece 6 has been taken out.

  As described above, the hot water work is performed using the force that moves the gravity casting mold 30 by the transfer device, the rotational force that rotates the gravity casting mold 30 by the tilt return device 16, and the gravity. The pressurizing device using the piston and cylinder and the control device for the pressurizing device are unnecessary, and the die moving type gravity casting equipment 1 can be provided with a lower equipment cost and less energy consumption as compared with the prior art.

  In addition, since the hot water is pressed using the weight of the pressure pin 37 and the pressure plate 38, the die moving gravity casting equipment 1 capable of casting the workpiece 6 with high quality, high yield and short solidification time is provided. it can.

  The pressure at which the pressure pin 37 falls and pressurizes the molten metal 3 in the gravity casting mold 30 is applied to the gravity casting mold 30 and the workpiece 6 by the weight of the pressure pin 37 and the weight of the pressure plate 38. The pressure can be adjusted to a suitable pressure, and the hot water capacity is improved. As a result, the suppression of shrinkage cavities in the cavity 34 is improved, and the die moving gravity casting equipment 1 capable of casting the workpiece 6 with high quality, high yield, and short solidification time can be provided. The applied pressure is a value obtained by dividing the total weight of the pressure pin 37 and the pressure plate 30 by the cross-sectional area perpendicular to the pressure direction of the pressure pin 37.

  Furthermore, the pressurizing timing of the hot water by the pressurizing pin 37 adjusts the position where the first guide rail 14 is disposed between the tilting device 13 and the cooling device 15 to most effectively suppress the occurrence of shrinkage nests. Since the pressurizing timing of the hot water to be determined can be determined, the hot water capacity is improved. As a result, it is possible to provide a mold-movable gravity casting facility 1 capable of casting the workpiece 6 with improved suppression of shrinkage nest, high quality, high yield, and short solidification time.

(Embodiment 2)
FIG. 8 is a part of a cross section of the gravity casting mold according to the embodiment of the present invention, and shows a pressing pin and a pressing plate as the center. The gravity casting mold of the second embodiment is the same as the gravity casting mold 30 of FIG. 2 except for the pressure pin, and the same parts and parts are denoted by the same reference numerals.

  The pressurizing pin 50 is configured by screwing a pressurizing pin head 51 that pressurizes the molten metal 3 in the hot metal hole 35 into a connecting member 52. The pressure pin head 51 is made of a material having a low thermal conductivity such as ceramic or heat-resistant tempered glass, and includes a large-diameter portion 51a and a small-diameter portion 51b having a smaller diameter and a male screw than the large-diameter portion 51a. The connecting member 52 is made of alloy steel such as stainless steel, and is provided with a female screw to which the male screw of the pressure pin head 51 is coupled at one end side and a male screw to be screwed into the pressure plate 38 at the other end.

  The material of the pressure pin head 51 is ceramic and heat-resistant glass having lower thermal conductivity than metal and a small heat capacity per volume. Therefore, the heat released from the connecting member 52 to the outside from the molten metal 3 that gets wet with the pressure pin head 51 via the pressure pin head 51 is reduced compared to the metal. Further, the amount of heat by which the pressure pin head 51 is heated by the molten metal 3 is reduced as compared with the metal. As a result, when hot metal is pressed with the pressure pin 50, the directional solidification of the molten metal 3 in the cavity 34 is suppressed, the suppression of shrinkage nest generation is improved, and the workpiece 6 with a high yield can be cast.

  In addition, since the pressure pin 50 is made of ceramic or heat-resistant glass only in the head where the molten metal gets wet, the cost is lower than the case where the entire pressure pin 50 is made of ceramic or heat-resistant glass. The cost of

  In the case where the gravity casting mold 30 is a single die, there is only one place for the feeder hole 35. In this case, the pressure pin 37 can be smoothly dropped in a substantially vertical direction without entering the hot water hole 35 by bringing the pressure pin 37 into line contact with the inner peripheral surface of the hot water hole 35 and pressing. Stable hot water work by the pin 37 is possible. As a result, suppression of shrinkage nest generation is improved, and one mold moving gravity casting facility capable of casting a workpiece 6 having a high yield can be provided. Further, the reliability of the mold moving gravity casting equipment 1 is improved.

(Embodiment 3)
FIG. 9 is a view showing a part of a cross section of the gravity casting mold according to the embodiment of the present invention, centering on the feeder hole and the pressure pin. The gravity casting mold of Embodiment 3 is the same as the gravity casting mold 30 of FIG. 2 except for the pressure pin, and the same parts and parts are denoted by the same reference numerals.

  A plurality (two in the embodiment) of the feeder holes 55 are provided, and the length D in the direction in which the feeder holes 55 are arranged is longer than the length d in the direction perpendicular to the arrangement direction. is there. The pressure pin 56 is inserted so as to be movable in the axial direction of the feeder hole 55, and has a substantially square cross section and is provided with an R at the corner. The substantially square cross section of the pressurizing pin 56 is smaller than the cross section of the elongated hole of the feeder hole 55, and each of the pressurizing pins 56 is in contact with the feeder hole 55 at three locations (for example, P1, P2, P3) and line contact. To do.

  In addition, a molten metal supply port 42 is provided with the two feeder holes 55 interposed therebetween.

  At the time of casting, the gravity casting mold 30 becomes high temperature (for example, approximately 600 degrees) and thermally expands, and the distance between the feeder holes 55 also increases due to the thermal expansion. On the other hand, since the pressure plate 38 is in a normal temperature atmosphere, the distance between the pressure pins 56 hardly thermally expands. Accordingly, the distance between the feeder holes 55 and the distance between the pressure pins 56 are different due to the effect of thermal expansion, but the feeder holes 55 are elongated in the distance direction between the feeder holes 55. Since the pressure pin 56 can smoothly fall in the substantially vertical direction without entering the hot water hole 55, a stable hot water work by the pressure pin 56 can be performed. As a result, the suppression of shrinkage nests is improved, and the mold moving gravity casting equipment 1 capable of casting the work 6 with high quality and high yield can be provided. Further, the reliability of the mold moving gravity casting equipment 1 is improved.

  In addition, when three or more feeder holes are provided, the same effect can be obtained by the above-described operation if they are elongated in the direction in which the arrangement distance is long among the adjacent feeder holes.

It is explanatory drawing of the metal mold | die movable gravity casting installation concerning Embodiment 1 of this invention. It is explanatory drawing of the gravity casting metal mold | die concerning Embodiment 1 of this invention. It is explanatory drawing of the action | operation of the pressurization plate stop shutter concerning Embodiment 1 of this invention. It is a figure which shows the hot water supply completion state by the hot water supply robot concerning Embodiment 1 of this invention. It is a figure which shows the casting completion state by the tilting apparatus concerning Embodiment 1 of this invention. It is a figure which shows the hot water end state concerning Embodiment 1 of this invention. It is a figure which shows the state in the middle of the tilting return by the tilting return apparatus concerning Embodiment 1 of this invention. It is explanatory drawing which shows a part of cross section of the gravity casting mold concerning Embodiment 2 of this invention. It is explanatory drawing which shows a part of cross section of the gravity casting mold concerning Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold moving casting equipment 3 Molten metal 10 Mobile casting equipment 13 Tilt device 14 1st guide rail 15 Cooling device 16 Tilt return device 17 2nd guide rail 19 Transfer device 30 Gravity casting die 32 Upper die 33 Lower die 34 Cavity 35, 55 Pressurizing hole 37, 50, 56 Pressure pin 38 Pressure plate 38c First slide part 39 Pressure plate guide pin (first force receiving member)
40 Pressing plate stopper shutter 40c Second slide portion 41 Shutter guide pin (two force receiving members)
51 Pressure pin head 52 Connecting member

Claims (6)

A mold moving gravity casting equipment comprising: a gravity casting mold to which molten metal is supplied; and a mobile casting equipment for performing casting by circulating the gravity casting mold,
A tilting device for tilting the gravity casting mold and pouring the molten metal into the gravity casting mold;
A cooling device that solidifies the molten metal poured by cooling the gravity casting mold;
A tilt return device for returning the tilted gravity casting mold to its original rotational position;
A transfer device for transferring the gravity casting mold by connecting the tilt device, the cooling device, and the tilt return device;
A first guide rail disposed between the tilting device cooling device;
The tilt return device or a second guide rail disposed on the tilt return device,
The gravity casting mold is
Having a cavity for forming a casting within the gravity casting mold;
An upper mold forming one of the cavities;
A lower die that contacts the upper die and forms the other of the cavities;
A hot water hole for communicating the cavity with the outside of the gravity casting mold when the upper mold and the lower mold are in contact with each other;
In the feeder hole, a pressure pin that moves inside and out freely,
A pressure plate integrally fixed to an end of the pressure pin;
A shutter that is disposed on the upper mold and moves in a reciprocating manner on a side surface of the upper mold;
The pressure plate has a first slide portion on a fixing surface with the pressure pin,
The shutter has a second slide portion on a contact surface with the first slide portion,
Further, a first force receiving member fixed to the pressure plate and extending in the forward / backward direction and the orthogonal direction of the pressure pin,
A second force receiving member fixed to the shutter and extending in a direction coaxial with the advancing and retreating direction of the pressure pin;
During the transfer of the gravity casting mold from the tilting device to the cooling device by the transfer device, the second force receiving member abuts on the first guide rail, and the first guide rail is the pressure plate stop shutter. Slide in the direction away from the pressure plate, drop the pressure plate to detach the second slide portion from the first slide portion,
While the gravity casting mold is being tilted back by the tilt return device, the first force receiving member contacts the second guide rail, and the second guide rail moves the pressure plate away from the feeder hole. A die moving gravity casting facility, wherein the die moving gravity casting equipment is moved, and the second slide part is brought into contact with the first slide part by dropping the pressure plate stopper shutter. The mold moving gravity casting equipment according to claim 1, wherein the pressurizing force of the hot water by the pressure pin is adjusted by the weight of the pressure pin and the weight of the pressure plate. The pressurizing timing of the pressurizing pin by the hot water is adjusted at a position where the first guide rail is disposed between the tilting device and the cooling device. Mold moving gravity casting equipment according to any one of the above. The pressure pin includes a pressure pin head made of either ceramic or heat-resistant glass for pressing the molten metal of the gravity casting mold, one end connected to the pressure pin head, and the other end connected to the pressure plate. The die moving gravity casting equipment according to any one of claims 1 to 3, further comprising a connecting member. The die moving gravity casting equipment according to any one of claims 1 to 4, wherein the pressurizing pins are in line contact with the inner peripheral surface of the feeder hole at three locations. The mold moving gravity according to any one of claims 1 to 5, wherein a plurality of the feeder holes are provided and are elongated holes in a direction in which an arrangement distance is long among adjacent feeder holes. Casting equipment.

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