JP6379847B2 - Casting equipment - Google Patents

Description

  The present invention relates to a casting apparatus.

  2. Description of the Related Art Conventionally, in a casting apparatus that performs low pressure casting or low / medium pressure casting of an aluminum alloy that is a material of a vehicle subframe or the like, a molten metal supply apparatus that supplies a molten metal to a supply destination such as a mold cavity for each casting cycle is known. (For example, refer to Patent Document 1). This molten metal supply device is for providing an electromagnetic coil in a cylindrical duct and generating a moving magnetic field inside the duct to provide thrust to the molten metal (molten metal) in the duct and supply it to the supply destination. An induction type electromagnetic pump is used.

  When supplying the actual molten metal, the molten metal is pumped up to the height of the hot water supply inductor in the duct by a standing inductor disposed at a position lower than the level of the molten metal in the molten metal tank. Then, the molten metal pumped up to this height is transferred to the supply destination by an inductor for hot water supply, whereby the molten metal is supplied.

  However, in the molten metal supply device of the prior art disclosed in Patent Document 1, it is necessary to arrange two electromagnetic coils of a startup inductor and a hot water supply inductor in a duct, and depending on supply conditions It is necessary to control the power closely. This complicates the structure around the duct and complicates the system in both the power system and the control system.

  Moreover, in order to obtain a hot metal effect for preventing sinking at the time of so-called solidification / contraction of the molten metal, it is necessary to apply pressure to push the molten metal while the molten metal is melting in the cavity. Thus, it is considered that the thrust by the electromagnetic coil alone is not sufficient, and therefore a countermeasure for obtaining a more effective hot-water feeder effect is necessary.

JP 2011-115844 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a casting apparatus capable of supplying hot water using an electromagnetic coil with a simple configuration and obtaining a necessary and sufficient hot-water supply effect.

  One casting apparatus according to the present invention includes a holding chamber for holding a molten metal filled in a cavity of a mold having an opening below, a communication with the holding chamber through a communication path, and a lower portion of the mold. A pouring chamber for containing molten metal, a cylindrical stalk in which an upper end opening communicates with the opening of the cavity and a lower end opening is immersed in the molten metal in the pouring chamber, and an outer peripheral side of the stalk. A molten metal transfer means for transferring the molten metal in the stalk into the cavity by the action of electromagnetic induction having an electromagnetic coil, and at least from the pouring chamber by discharging gas from the cavity and depressurizing the inside of the cavity. The pressure reducing means configured to lift the molten metal in the stalk to the upper end position of the electromagnetic coil, and configured to be movable forward and backward with respect to the opening of the cavity and a hot water reservoir communicating with the cavity. A gate seal center pressurizing pin that opens and closes the opening of the cavity and pressurizes the inside of the cavity, and when the molten metal is filled into the cavity from the pouring chamber, the pressure reducing means and the molten metal transfer means are controlled in conjunction with each other to supply hot water. And a hot water supply control means.

  Another casting apparatus according to the present invention includes a holding chamber that holds a molten metal filled in a cavity of a mold having an opening below, and is communicated with the holding chamber via a communication path and is disposed below the mold. A molten metal to be accommodated, and the holding chamber and the molten metal chamber are communicated with each other through the communication passage to accommodate the molten metal supplied from the holding chamber and to form a sealed space on the upper surface of the molten metal A pressurizing chamber, a cylindrical stalk in which the upper end opening communicates with the opening of the cavity and the lower end opening is immersed in the molten metal in the pouring chamber, and an electromagnetic coil disposed on the outer peripheral side of the stalk. And a molten metal transfer means for transferring the molten metal in the stalk into the cavity by the action of electromagnetic induction, and supplying the gas to the sealed space of the pressurized chamber to pressurize the pressurized chamber. At least the upper end position of the electromagnetic coil And pressurizing means configured to lift the molten metal in the stalk, and configured to be able to advance and retreat with respect to the opening of the cavity and a hot water reservoir communicating with the cavity, and opens and closes the opening and adds to the interior of the cavity. A gate seal center pressurizing pin for pressing, and a hot water supply control means for supplying hot water by interlocking control of the pressurizing means and the molten metal transfer means when the molten metal is filled into the cavity from the pouring chamber. Features.

  Still another casting apparatus according to the present invention includes a holding chamber that holds a molten metal filled in a cavity of a mold having an opening below, and communicates with the holding chamber through a communication path and below the mold. A pouring chamber that is disposed and accommodates the molten metal, communicates with the holding chamber and the pouring chamber via the communication passage, accommodates the molten metal supplied from the retaining chamber, and forms a sealed space on the upper surface of the molten metal. A pressurizing chamber to be formed, a cylindrical stalk in which an upper end opening communicates with the opening of the cavity and a lower end opening is immersed in the molten metal in the pouring chamber, and an electromagnetic coil disposed on the outer peripheral side of the stalk. A molten metal transfer means for transferring the molten metal in the stalk into the cavity by the action of electromagnetic induction; a pressure reducing means for discharging the gas from the cavity to depressurize the inside of the cavity; and the sealed space of the pressure chamber. Gas to the A pressurizing means configured to lift the molten metal in the stalk from the pouring chamber to at least the upper end position of the electromagnetic coil by pressurizing the pressure chamber, and an opening of the cavity and a hot water reservoir communicating with the cavity A gate seal center pressurizing pin configured to be movable forward and backward to open and close the opening and pressurize the cavity, and the pressure reducing means and the pressurizing means when the molten metal is filled into the cavity from the pouring chamber And a hot water supply control means for supplying hot water by interlocking control of the molten metal transfer means.

  In one embodiment of the present invention, a plurality of partial pressure pins configured to be movable forward and backward with respect to the bush at the end of the cavity may be further provided.

  According to the present invention, it is possible to obtain a necessary and sufficient hot-water supply effect by supplying hot water using an electromagnetic coil with a simple configuration.

It is sectional drawing which shows the casting apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the control pattern of the casting apparatus. It is sectional drawing which shows the casting apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the control pattern of the casting apparatus. It is a figure which shows the control pattern of the casting apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the casting apparatus which concerns on the 4th Embodiment of this invention. It is a figure which shows the control pattern of the casting apparatus.

  Hereinafter, a casting apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a sectional view showing a casting apparatus according to the first embodiment of the present invention. As shown in FIG. 1, the casting apparatus 100 according to the first embodiment is connected to the holding chamber 10 that holds the molten metal A, the holding chamber 10 and the communication path 11, and is supplied from the holding chamber 10. A pouring chamber 20 for containing the molten metal A is provided.

  In the holding chamber 10 and the pouring chamber 20, heaters 21, 22, and 23 for heating the molten metal A stored therein are installed. The heaters 21 to 23 heat the molten metal A to a temperature of about 550 ° C. to 750 ° C., which is a temperature necessary for maintaining the molten state of the molten metal A, for example.

  The holding chamber 10 is provided with an on-off valve 13 that fits into the hole 12 for controlling the supply of the molten metal A to the communication passage 11. The on-off valve 13 opens and closes the hole 12 as the cylinder 13b and the rod 13c that are driven based on the control of the hot water supply control device 1 advance and retract. In the on-off valve 13, for example, in a charging process of the molten metal A into the pouring chamber 20 after completion of the casting process by the casting apparatus 100, a certain amount of the molten metal A is always accommodated in the pouring chamber 20 via the communication path 11. Is opened and closed.

  The upper end opening of the holding chamber 10 is closed by a fixing plate 14. The fixing plate 14 has a supply port (not shown) for supplying the molten metal A into the holding chamber 10. The molten metal A is supplied from the inside of the holding chamber 10 whose molten metal surface is higher than the pouring chamber 20 to the communication passage 11 through the hole 12 due to the head difference.

  And the molten metal A is accommodated in the pouring chamber 20 so that the hot_water | molten_metal level to the front-end | tip of the hot_water | molten_metal sensor 24 attached to the wall part of the pouring chamber 20 with the jig | tool which is not shown in figure is maintained. A base attachment 25 for attaching a cylindrical stalk 30 to which an electromagnetic coil 40 is attached between the pouring chamber 20 and the fixed plate 26 is attached to the upper end opening of the pouring chamber 20. The upper surface space of the inner molten metal A is not sealed.

  In the center of the base attachment 25 and the fixing plate 26, a stalk 30 having both ends opened is fixed together with the electromagnetic coil 40. The electromagnetic coil 40 is disposed on the outer peripheral side of the stalk 30 above the pouring chamber 20. The lower end opening of the stalk 30 is immersed in the molten metal A in the pouring chamber 20.

  A fixed mold 28 is attached to the upper surface of the fixed plate 26. A movable mold 29 is mounted on the lower surface of the movable plate 27 configured to be movable upward with respect to the fixed mold 28. The fixed mold 28 and the movable mold 29 form a cavity 31 when the mold is closed. In the central portion of the fixed mold 28, an opening (pouring gate) 31 a is formed in a gate portion communicating with the cavity 31.

  The upper end opening of the stalk 30 communicates with the opening 31a. In addition, a degassing pipe 31 b for extracting gas from the cavity 31 is connected to the fixed mold 28. A chill vent 31c is provided between the gas vent pipe 31b and the cavity 31 to prevent the molten metal A from entering the gas vent pipe 31b.

  A gate seal center pressure pin 50 and a plurality of partial pressure pins 51 are attached to the movable mold 29. The gate seal center pressurizing pin 50 is formed in a substantially rod shape having a small diameter with a convex end side. The gate seal center pressure pin 50 is configured to be movable forward and backward with respect to the opening 31 a of the cavity 31 and the hot water reservoir 32 communicating with the cavity 31.

  The gate seal center pressurizing pin 50 thus configured opens and closes the opening 31a of the cavity 31 and pressurizes the inside of the cavity 31. The partial pressure pin 51 is formed in a substantially rod shape and is configured to be able to advance and retreat with respect to the bush 33 at the end of the product communicating with the cavity 31, and pressurizes the cavity 31.

  The gate seal center pressurizing pin 50 is configured such that its upper end portion is connected to a piston mechanism 52 as a driving means provided on the upper surface of the movable plate 27 so as to move up and down. Similarly, the partial pressurizing pins 51 are connected to a piston mechanism 53 as driving means provided on the upper surface of the movable plate 27 so that the partial pressurizing pins 51 can move up and down.

  As shown in FIG. 1, the casting apparatus 100 according to the first embodiment configured as described above further includes a vacuum connected to a gas vent pipe 31b via a gas vent decompression control servo valve 34. It has the apparatus 35 and the hot water supply control apparatus 1 which can control operation | movement of the casting apparatus 100 whole regarding the hot water supply of the molten metal A especially.

  In addition, the molten metal transfer means which transfers the molten metal A in the stalk 30 into the cavity 31 by the action of electromagnetic induction by the electromagnetic coil 40 and a three-phase AC power source (not shown) is configured. The degassing pipe 31b, the decompression control servo valve 34, the vacuum device 35, and the like constitute molten metal supply means capable of lifting the molten metal A in the stalk 30 from the molten metal chamber 20 to at least the upper end position of the electromagnetic coil 40.

  The vacuum device 35 discharges the gas from the cavity 31 via the decompression control servo valve 34 and the gas venting pipe 31b, and decompresses the inside of the cavity 31. The vacuum device 35 includes a vacuum tank 35a, a vacuum pump 35b that evacuates the vacuum tank 35a, and a motor 35c that drives the vacuum pump 35b.

  The hot water supply control apparatus 1 supplies hot water by controlling the molten metal supply means and the molten metal transfer means when the molten metal A is filled into the cavity 31 from the pouring chamber 20. In the first embodiment, the hot water supply control device 1 first controls the decompression control servo valve 34 and the vacuum device 35 which are melt supply means to discharge the gas in the cavity 31 and decompress the inside thereof to melt the melt A. To the priming water.

  Then, the hot water supply control device 1 controls the molten metal supply means and the electromagnetic coil 40 as the molten metal transfer means together to fill the molten metal A into the cavity 31 (hot water supply). Finally, the hot water supply control device 1 controls the piston mechanism 52 to close the opening 31a by the gate seal center pressurizing pin 50 and pressurize the cavity 31. Further, the piston mechanism 53 is controlled so that the inside of the cavity 31 is pressurized by the partial pressure pin 51.

  Next, a series of casting operations by the casting apparatus 100 including hot water supply control by the hot water supply control apparatus 1 will be described. FIG. 2 is a diagram showing a control pattern of the casting apparatus. In FIG. 2, the left vertical axis indicates the degree of decompression (kPa), and the right vertical axis indicates the load voltage (V) to the electromagnetic coil 40 and the stroke (pin St) (mm) of the gate seal center pressurizing pin 50. The horizontal axis indicates time (sec).

  Here, a series of casting operations assuming the casting of a sub-frame of a large and thin vehicle will be described.

  In the first embodiment, the casting operation is performed by pressure reduction (priming water) → electromagnetic induction + pressure reduction (combined filling) → pin pressure. The casting process includes (1) initial state, (2) process 1, (3) process 2, (4) process 3, (5) process 4, and (5) processes 5 (1) to (6). Constitutes one casting cycle.

  As shown in FIG. 2, in the (1) initial state at time T <b> 0, the molten metal surface height of the molten metal A in the pouring chamber 20 is at a constant height detected by the tip of the molten metal surface sensor 24. In other words, the level of the molten metal A in the pouring chamber 20 is controlled to be kept constant immediately before the start of casting. As described above, the hot water surface level in the pouring chamber 20 is controlled by opening the on-off valve 13 of the holding chamber 10 in the charging process of the molten metal A so that the molten metal A flows into the pouring chamber 20 through the communication passage 11. The on-off valve 13 is closed at the same time as the hot water level reaches the tip of the hot water level sensor 24.

  In the initial state, the electromagnetic coil 40 is in a cut-off state in which the load voltage (V) is not excited, and the vacuum system including the vacuum device 35 and the pressure reduction control servo valve 34 is in a vacuum state. The depressurization control servo valve 34 has a switching valve that can switch the degassing pipe 31b on the cavity 31 side between a depressurization line and an air release line.

  In the initial state, the pressure reducing control servo valve 34 has a switching valve on the air release line side, so that the gas vent pipe 31b on the cavity 31 side, the pressure reducing runner (not shown) in the mold, the chill vent 31c, the cavity 31, and the product The runner 31d, the opening 31a, and the stalk 30 are in communication with the outside (atmosphere).

  Next, in step (2) 1 from time T0 to time T1, the vacuum suction of the molten metal A in the pouring chamber 20 is performed. When decompression is started at time T0 of time (elapsed time) 0.0 sec, load voltage 0 V to the electromagnetic coil 40, decompression degree 0 kPa, and pin St0 mm, the switching valve of the decompression control servo valve 34 is switched to the decompression line side. Control to open the servo valve is performed.

  As a result, the degassing pipe 31b, the decompression runner in the mold, the chill vent 31c, the cavity 31, the product runner 31d, the opening 31a and the stalk 30 are gradually decompressed. The degree of decompression at this time is the distance from the surface of the molten metal A in the pouring chamber 20 to the upper end position where the electromagnetic coil 40 on the outer peripheral side of the stalk 30 is disposed, that is, the degree of decompression corresponding to the head height. Set.

  Specifically, for example, when the molten metal A is aluminum, it is necessary to raise the molten metal A in the stalk 30 when the head height is 800 mm with reference to the numerical value of 40 mm / kPa calculated from the specific gravity. Set the degree of vacuum to -20 kPa. In addition, the vacuum decompression speed at this time is as fast as possible as long as the molten metal A becomes a turbulent flow in the stalk 30 and does not entrain gas or exceed a predetermined distance (height). The speed at which hot water is transferred to the height of the upper end position of the electromagnetic coil 40 is desirable.

  Therefore, it is necessary to adjust the degree of decompression per time of the decompression control servo valve 34, that is, the decompression speed. At time T1 when the molten metal A in the stalk 30 reaches the upper end position of the electromagnetic coil 40, the time is 3.0 sec, the load voltage is 0 V, the degree of decompression is −20 kPa, and the pin St is 0 mm.

  Next, in (3) Step 2 from time T1 to time T2, the molten metal A is transferred to the opening 31a by electromagnetic induction. A voltage is applied to the electromagnetic coil 40, and the molten metal A in the stalk 30 is raised to the vicinity of the opening 31a by the action of electromagnetic induction. The load voltage applied to the electromagnetic coil 40 in Step 2 is 80 V at time T1. At this time, for example, based on a predetermined Q (flow rate) -H (lift) characteristic according to the load voltage of the electromagnetic coil 40, the load voltage obtained in advance to meet the head up to the height of the opening 31a. And the rate of increase, which is the increment of load voltage per hour, is adjusted.

  The rate of increase of the load voltage is adjusted so that, for example, the tip of the molten metal A is transferred to the opening 31a as quickly as possible within a range in which the molten metal A does not eject from the opening 31a. In step 2, the degree of decompression of the cavity 31 is maintained at −20 kPa required for transferring the molten metal A to the vicinity of the upper end position of the electromagnetic coil 40 in the stalk 30. It should be noted that at the time T2 when the molten metal A in the stalk 30 reaches the position of the opening 31a, the time is 6.0 sec, the load voltage is 110 V, the pressure reduction is −20 kPa, and the pin St is 0 mm.

  Then, in (3) step 3 from time T2 to time T4, the molten metal A is transferred from the opening 31a to the runner 31d of the product part by the combined use of electromagnetic induction and decompression, and the molten metal A is filled into the cavity 31. Is completed. That is, in step 3, the load voltage to the electromagnetic coil 40 is further increased so that the molten metal A passes through the runner 31 d of the product part ahead of the opening 31 a and flows into the cavity 31.

  However, when a product having a thin rib structure such as a subframe is cast, the flow path of the molten metal A is extremely narrowed after the product portion has passed through the runner 31d. In addition, since the flowing molten metal A is extracted from the surrounding mold wall surface and the viscosity of the molten metal A increases, the flow resistance increases and the molten metal A hardly flows (the flow velocity becomes small).

  From this, in step 3, the load voltage to the electromagnetic coil 40 is set to the maximum value (for example, so that the filling of the molten metal A is completed as soon as possible after the molten metal A passes through the opening 31a after the time T2. , 160V). It should be noted that it takes a certain time from when the load voltage is increased to the maximum value until the molten metal A is actually filled in the cavity 31 and the filling is completed.

  For this reason, it is necessary to hold | maintain the load voltage made into the maximum value for the predetermined time. In FIG. 2, the time from time T3 to time T5 is the maximum voltage holding time. With respect to the maximum voltage holding time, for example, a preliminary experiment using the casting apparatus 100 is performed, and the casting into the cavity 31 is completed as described above by repeating trial and error with various changes in the maximum voltage holding time. It is possible to determine the minimum time.

  On the other hand, the degree of pressure reduction during the filling of the melt A into the cavity 31 may be maintained at −20 kPa as described above, but may be as follows. That is, for the reasons described above, a sufficient flow rate cannot be obtained only by the transfer of the electromagnetic coil 40 due to the electromagnetic induction, and as a result, casting defects such as poor hot water and a hot water boundary occur on the cast product surface. In addition to the increase in the load voltage, the pressure reduction degree in the cavity 31 may be further increased by the pressure reduction control servo valve 34.

  Therefore, at the time T3 when the maximum load voltage is applied to the electromagnetic coil 40, for example, the time is 6.3 sec, the load voltage is 160 V, the degree of decompression is −90 kPa, and the pin St is 0 mm. Thus, during only 0.3 sec from time T2 to time T3, the load voltage increases from 110 V to 160 V, and the degree of decompression increases from −20 kPa to −90 kPa.

  Note that, after the filling of the molten metal A into the cavity 31 is completed, the decompression in the cavity 31 is unnecessary, and therefore the decompression control servo valve 34 is closed simultaneously with the elapse of a predetermined holding time. However, for the load voltage to the electromagnetic coil 40, the maximum load voltage is continuously applied until the time point T5 when the pressurization of the gate seal center pressurizing pin 50 in the next process is started, and the molten metal A is supplied. Continue.

  Therefore, at the time T4 when the filling of the molten metal A into the cavity 31 is completed, the time is 8.0 sec, the load voltage is 160 V, the pressure reduction is −90 kPa, and the pin St0 mm, but at the time T5, the time is 8.5 sec. The load voltage is 160 V, the pressure reduction degree is 0 kPa, and the pin St is 60 mm. Thus, the pressure reduction degree decreases from −90 kPa to 0 kPa in only 0.5 sec from time T4 to time T5.

  Next, in (4) Step 4 from time T4 to time T6, the molten metal A filled in the cavity 31 is solidified. That is, first, the gate seal center pressure pin 50 is driven in order to solidify the molten metal A in the cavity 31 under pressure after a predetermined holding time necessary for completing the filling of the molten metal A into the cavity 31. Then, the opening 31a is closed.

  Specifically, the gate seal center pressurizing pin 50 starts to be driven at a time T4 when the filling of the molten metal A into the cavity 31 is completed and the decompression is stopped, and the opening 31a is completely closed at the time T5. Since the inside of 31 is a closed space, pin pressurization by the gate seal center pressurization pin 50 is started.

  After time T5, the gate seal center pressurizing pin 50 is lowered in a continuous operation, whereby a casting pressure of several tens of MPa that greatly exceeds the order of several tens of kPa, which can be achieved by the electromagnetic induction action of the electromagnetic coil 40. Is added to the sump 32. By the pressure applied by the gate pressure of the gate seal center pressurizing pin 50, the so-called hot water effect can be obtained, in which the molten metal A supplementing the solidification shrinkage generated inside the cavity 31 is transferred from the hot water pool 32. Can be suppressed. At this time, the pressure in the cavity 31 by the partial pressure pin 51 may be used together. The pressurization in the cavity 31 by the combined use of the partial pressurization pins 51 is the same in the following embodiments.

  After the gate seal center pressure pin 50 passes through the pin St 60 mm which closes the opening 31a, the inside of the cavity 31 becomes a closed space, so there is no need for hot water supply. For this reason, after time T5, the load voltage is set to 0 V and the application of the load voltage to the electromagnetic coil 40 is stopped.

  The pin pressurization by the forward movement of the gate seal center pressurization pin 50 is continued until the time T6 when the solidification of the cavity 31 and the puddle 32 is completed and the gate seal center pressurization pin 50 stops. At this time T6, the time is 16.0 sec, the load voltage is 0 V, the pressure reduction degree is 0 kPa, and the pin St is 98 mm.

  Finally, in (5) step 5 after time T6, the cast product after completion of solidification is taken out. That is, after the solidification of the molten metal A in the cavity 31 and the hot water pool 32 is completed, the gate seal center pressurizing pin 50 is moved backward to return the pin St of the gate seal center pressurizing pin 50 to the start position where it becomes 0 mm. Thereby, the molten metal A in the stalk 30 is returned to the inside of the pouring chamber 20. Then, the movable mold 29 is moved, the mold is opened, and the product is taken out by being pushed out by an unillustrated pushing mechanism or the like. The taken out product is transported out of the mold using a robot or the like.

  As described above, the casting apparatus 100 according to the first embodiment uses the molten metal A as a priming water by the pressure reduction in the cavity 31 by the pressure reduction control servo valve 34 or the like, and uses the electromagnetic induction and the pressure reduction of the electromagnetic coil 40 in combination. Is supplied (filled) into the cavity 31. And since the product is cast by the pin pressurization of the gate seal center pressurizing pin 50, hot water supply using the electromagnetic coil 40 is possible with a simple configuration, and a necessary and sufficient hot-water supply effect can be obtained.

[Second Embodiment]
FIG. 3 is a sectional view showing a casting apparatus according to the second embodiment of the present invention. In the following description, the same parts as those already described are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 3, the casting apparatus 101 according to the second embodiment is mainly different from the casting apparatus 100 according to the first embodiment in the following points. That is, the casting apparatus 101 includes a pressurizing chamber 60 that communicates with the holding chamber 10 and the pouring chamber 20 via the communication passage 11.

  Further, the casting apparatus 101 operates a gas pressurization pipe 61 a connected to the pressurization chamber 60, a gas pressurization control servo valve 61 that controls gas pressurization to the pressurization chamber 60, and operations of the gas pressurization control servo valve 61. And a pressurizing source 63 for supplying pressurized gas to the gas pressurizing control servo valve 61.

  Note that in the casting apparatus 101 according to the second embodiment, the decompression line by the vacuum system is omitted, and instead, the atmosphere opening pipe 36a and the atmosphere opening valve 36 that communicate with the opening 31a and open the opening 31a to the atmosphere. An open air line consisting of

  The pressurizing chamber 60 includes a tubular member 64 extending toward the communication path 11. The tubular member 64 is made of fine ceramics, and has a flange-shaped portion that covers the peripheral edge of the opening on the upper end opening side of the pressurizing chamber 60. The upper end opening of the pressurizing chamber 60 is closed by a fixed plate 66. The fixing plate 66 is disposed so as to cover the flange-shaped portion of the tubular member 64 via the packing 65, and is attached by mounting bolts 67.

  As a result, the inside of the pressurizing chamber 60 is a sealed space. The gas pressurization pipe 61a communicates with the sealed space. The pressure control device 62 controls the gas pressurization control servo valve 61 on the basis of a control command from the hot water supply control device 1 and supplies the inert gas from the pressurization source 63 to the pressurization chamber 60 via the gas pressurization pipe 61a. Supply in. The inert gas from the pressurization source 63 is supplied so that the sealed space of the pressurization chamber 60 does not become negative pressure. The pressure control device 62 may be provided as one of the internal functions of the hot water supply control device 1.

  The fixing plate 66 is provided with a hot water surface sensor 68 that extends forward and backward toward the hot water surface of the molten metal A. The hot water level sensor 68 is accommodated in a hot water level sensor housing 69 so as to be movable forward and backward in the direction indicated by the arrow in the figure. The molten metal level sensor 68 detects whether or not the molten metal A sent from the holding chamber 10 is at a predetermined level in the pressurizing chamber 60. The height of the hot water level sensor 68 is changed in advance according to the casting weight by the casting apparatus 101.

  The pouring chamber 20 includes a tubular member 37 made of fine ceramics that extends toward the communication path 11 after the hot water level sensor 24 is omitted. The tubular member 37 is connected to the stalk 30 at a connecting portion with the base attachment 25. For this reason, in the casting apparatus 101 according to the second embodiment, the stalk 30 and the tubular member 37 constitute one stalk.

  Next, a series of casting operations by the casting apparatus 101 will be described. FIG. 4 is a diagram showing a control pattern of the casting apparatus. 4 is different from FIG. 2 in that the gas pressure (kPa) is shown along with the load voltage and the pin St on the left vertical axis. In the following description, the description overlapping with the already described part is omitted.

  In the second embodiment, the casting operation is performed by gas pressurization (priming water) → electromagnetic induction → pin pressurization. The casting process includes (1) initial state, (2) process 1, (3) process 2, (4) process 3, (5) process 4, and (5) processes 5 (1) to (6). Constitutes one casting cycle.

  As shown in FIG. 4, in the initial state (1) at time T0, the molten metal surface height of the molten metal A in the pressurizing chamber 60 is determined by the tip of the molten metal surface sensor 68 disposed at a preset height. It is at a certain detected height. That is, the opening / closing control of the opening / closing valve 13 of the holding chamber 10 is performed based on the detection signal from the hot water level sensor 68 as in the case of the hot water level holding control of the molten metal A in the pouring chamber 20 of the first embodiment. Accordingly, the level of the molten metal A in the pressurizing chamber 60 is controlled so as to be kept constant immediately before the start of casting.

  In the initial state, the electromagnetic coil 40 is in a cut-off state with a load voltage of 0 V, and the pressurization system including the pressurization source 63, the gas pressurization control servo valve 61, and the gas pressurization pipe 61a is gas pressurization control. The servo valve 61 is open to the atmosphere. The gas pressurization control servo valve 61 has a switching valve capable of switching the gas pressurization pipe 61a on the pressurization chamber 60 side between a pressurization line and an atmosphere release line.

  In this initial state, since the gas pressurization control servo valve 61 is open to the atmosphere as described above, the pressurizing chamber 60 is also open to the atmosphere. Further, since the atmosphere release valve 36 is switched from the open state to the closed state under the control of the hot water supply control device 1 or the pressure control device 62, the atmosphere release line is closed.

  Next, in (2) Step 1 from time T0 to time T1, the molten metal A in the pressurizing chamber 60 is pressurized. When gas pressurization is started at time T0 of time 0.0 sec, load voltage 0 V, pressure reduction 0 kPa, pin St0 mm, and gas pressurization 0 kPa, the switching valve of the gas pressurization control servo valve 61 is switched to the pressurization line side. Control to open the servo valve. Note that no decompression is performed in the second embodiment.

  When gas pressurization is started, an inert gas is supplied to the sealed space of the pressurizing chamber 60, and the molten metal surface of the molten metal A is pressurized and lowered. Along with this, the molten metal A inside the tubular member 37 of the pouring chamber 20 rises. The pressure of gas pressurization at this time is set to a pressure corresponding to the head height, which is the distance from the surface of the molten metal A in the pouring chamber 20 to the upper end position of the electromagnetic coil 40, as in the first embodiment. To do.

  When the molten metal A is aluminum and the head height is 800 mm, the gas pressurizing pressure is set to 20 kPa based on the numerical value calculated from the specific gravity as described above. Further, the gas pressurization speed at this time is preferably a speed at which the molten metal A is quickly transferred to the height of the upper end position within a range in which no gas is entrained or exceeds a predetermined height. A pressure increasing pattern which is a pressure increment per time is set at. At time T1 when the molten metal A in the stalk 30 reaches the upper end position of the electromagnetic coil 40, the time is 3.0 sec, the load voltage is 0 V, the pin St is 0 mm, and the gas pressurization is 20 kPa.

  Next, in (3) Step 2 from time T1 to time T2, the molten metal A is transferred to the opening 31a by electromagnetic induction. Immediately after time T1 when the molten metal A reaches the upper end position of the electromagnetic coil 40, a load voltage of about 80 V is applied to the electromagnetic coil 40. Then, since the voltage is continuously applied to the electromagnetic coil 40 and the molten metal A is raised to the vicinity of the opening 31a, the load voltage is further increased. Further, the pressure due to gas pressurization is controlled from the upper end position of the electromagnetic coil 40 by performing further control to open the servo valve of the gas pressurization control servo valve 61 whose servo valve is switched to the pressurization line side by the switching valve. The head height is increased to the height corresponding to the distance to the opening 31a.

  In this case, the load voltage is adjusted in increments of voltage per hour so that the hot water is quickly transferred to the opening 31a within a range where the molten metal A does not blow out when the molten metal A reaches the opening 31a. In addition, the pressure due to the gas pressurization causes the molten metal A in the hot water supply chamber 20 to be pumped up and heated by electromagnetic induction of the electromagnetic coil 40, so that the surface of the molten metal A in the pressurization chamber 60 is lowered, thereby reducing the pressure in the sealed space. This is done so that the pressure does not drop. At the time T2 when the hot water reaches the opening 31a, the time is 6.0 sec, the load voltage is 110 V, the pin St is 0 mm, and the gas pressurization is 40 kPa.

  In step (4) 3 from time T2 to time T4, the molten metal A is transferred from the opening 31a to the runner 31d of the product part by electromagnetic induction, and the filling of the molten metal A into the cavity 31 is completed. That is, in step 3, the load voltage to the electromagnetic coil 40 is further increased so that the molten metal A flows from the opening 31a through the product runner 31d into the cavity 31.

  In addition, when casting the subframe, there is a concern that the flow rate of the molten metal A becomes small as described above, and therefore, the electromagnetic coil 40 is supplied to the electromagnetic coil 40 so that the filling of the molten metal A is completed promptly after the time T2. The load voltage is increased to 160 V, which is the maximum value, and held for the maximum voltage holding time.

  On the other hand, for the pressurizing chamber 60, the gas pressurization is stopped by switching the switching valve of the gas pressurization control servo valve 61 to the atmosphere open line side simultaneously with the application of the load voltage 110V to the electromagnetic coil 40, that is, after the time T2. Then, the sealed space of the pressurizing chamber 60 is opened to the atmosphere by gradually opening the servo valve after the time T3 when the maximum load voltage is applied.

  The release of the atmosphere after the gas pressurization by the pressurization line is stopped is due to the hot water surface of the melt A in the pressurization chamber 60 as the melt A in the pouring chamber 20 is pumped up and heated by electromagnetic induction of the electromagnetic coil 40. This is performed in order to reduce the pressure in the sealed space due to the decrease and to prevent the molten metal A on the pouring chamber 20 side from being supplied with a negative pressure.

  Therefore, at the time T3 when the maximum load voltage is applied to the electromagnetic coil 40, for example, the time is 6.3 sec, the load voltage is 160 V, the pin St is 0 mm, and the gas pressurization is 10 kPa. Thus, during only 0.3 sec from time T2 to time T3, the load voltage increases by 50 V and the pressure of gas pressurization decreases by 30 kPa.

  Note that after the filling of the melt A into the cavity 31 is completed, the gas pressurization in the pressurizing chamber 60 is not required, so that the switching valve of the gas pressurization control servo valve 61 is connected to the air release line simultaneously with the elapse of a predetermined holding time. Open the servo valve in the side position. Regarding the application of the maximum load voltage to the electromagnetic coil 40, the molten metal A is continuously supplied until the time T5 when the pin pressurization by the gate seal center pressurization pin 50 is started.

  For this reason, at the time T4 when the filling of the molten metal A into the cavity 31 and the start of driving of the gate seal center pressurizing pin 50 are started, the time is 8.0 sec, the load voltage is 160 V, the pin St0 mm, and the gas pressurization is 0 kPa. At time T5, the time is 8.5 sec, the load voltage is 160 V, the pin St is 60 mm, and the gas pressure is 0 kPa. Regarding gas pressurization, the pressure decreases from 10 kPa to 0 kPa during 1.7 seconds from time T3 to time T4.

  Next, in (4) Step 4 from time T4 to time T6, the molten metal A filled in the cavity 31 is solidified. The closing of the opening 31a by the gate seal center pressurizing pin 50 and the pressurization in the cavity 31 after the time T5 are performed as described above, and a hot water supply effect can be obtained.

  After the gate seal center pressurizing pin 50 passes through the pin St 60 mm that closes the opening 31a, the cavity 31 is closed and no hot water supply is required, so that the load voltage is set to 0 V and the load on the electromagnetic coil 40 after time T5. The application of voltage is stopped, and the air release valve 36 is opened to allow the opening 31a to communicate with the outside air through the air release pipe 36a through the air release line.

  Thereby, the molten metal A in the stalk 30 is returned into the tubular member 37 in the pouring chamber 20. In addition, the pin pressurization by the gate seal center pressurization pin 50 is continued until the time T6 of the time 16.0 sec, the load voltage 0 V, the pin St 98 mm, and the gas pressurization 0 kPa as described above.

  Finally, in (6) step 5 after time T6, the pin St of the gate seal center pressure pin 50 is returned to 0 mm as described above, and the mold is opened to take out the cast product. As described above, the casting apparatus 101 according to the second embodiment uses the molten metal A as a priming water by gas pressurization in the pressurizing chamber 60 by the gas pressurization control servo valve 61 or the like, and by the electromagnetic induction action of the electromagnetic coil 40. Molten metal A is supplied into the cavity 31 and the product is cast by pressing the gate seal center pressing pin 50. For this reason, similarly to the first embodiment, hot water supply using the electromagnetic coil 40 is possible with a simple configuration, and a necessary and sufficient hot-water supply effect can be obtained.

[Third Embodiment]
FIG. 5 is a diagram showing a control pattern of the casting apparatus according to the third embodiment of the present invention. The casting apparatus according to the third embodiment has the same configuration as the casting apparatus 101 according to the second embodiment. In the third embodiment, casting operation is performed by gas pressurization (priming water) → electromagnetic induction + gas pressurization (combined filling) → pin pressurization, and the casting process is similar to the above (1) to (6). This process constitutes one casting cycle.

  As shown in FIG. 5, in (1) initial state at time T0 and (2) step 1 from time T0 to time T1, the same operation and control as in the second embodiment are performed. And in (3) process 2 of the time T1-time T2, the molten metal A is transferred to the runner 31d of the product part from the opening 31a by combined use of electromagnetic induction and gas pressurization.

  That is, immediately after time T1, a load voltage of about 80V is applied to the electromagnetic coil 40, and the voltage increment per hour is adjusted in the predetermined range as described above in order to further raise the molten metal A to the vicinity of the opening 31a. The load voltage is increased above. The load voltage, gas pressurization, and the like at time T2 are the same as in the second embodiment.

  Further, the pressure due to gas pressurization is controlled from the upper end position of the electromagnetic coil 40 by performing further control to open the servo valve of the gas pressurization control servo valve 61 whose servo valve is switched to the pressurization line side by the switching valve. The head height is increased to the height corresponding to the distance to the opening 31a. By using this gas pressurization together with the hot water supply of the molten metal A in the pouring chamber 20 due to the electromagnetic induction of the electromagnetic coil 40, the molten metal surface in the pressurizing chamber 60 is lowered and the sealed space is reduced. The pressure inside does not drop.

  In (3) Step 3 from time T2 to time T4, the molten metal A is transferred from the opening 31a to the runner 31d of the product part by the combined use of electromagnetic induction and gas pressurization, and the molten metal A is filled into the cavity 31. Is completed. That is, in step 3, the load voltage applied to the electromagnetic coil 40 is further increased, and the pressure applied to the electromagnetic coil 40 at the time T2 is further increased simultaneously with the application of the load voltage 110V to the electromagnetic coil 40 at the time T2. Increase.

  Therefore, at the time T3 when the maximum load voltage is applied to the electromagnetic coil 40, the time is 6.3 sec, the load voltage is 160 V, the pin St is 0 mm, and the gas pressurization is 75 kPa. Furthermore, the gas pressurization reaches a maximum value of 85 kPa at a certain time immediately after the time T3. Thus, during only 0.3 seconds from time T2 to time T3, the load voltage increases from 110V to 160V, the pressure of gas pressurization increases from 40 kPa to 75 kPa, and immediately after that, the pressure is further increased to 85 kPa. ing.

  Note that, from the time when the gas pressure and the load voltage are set to the maximum values (85 kPa and 160 V) at a certain time after time T3, until the molten metal A is actually filled in the cavity 31 and the filling is completed as described above. Since a certain time is required, it is necessary to maintain the gas pressure and the load voltage set to the maximum values until, for example, time T5. This holding time can be obtained by a preliminary experiment or the like, similarly to the maximum voltage holding time of the first embodiment.

  Even after the filling of the melt A into the cavity 31 at the time T4, the gas pressurization control servo valve 61 to the pressurization chamber 60 and the load voltage to the electromagnetic coil 40 are the gates of the next process. Until the time when pin pressurization by the seal center pressurizing pin 50 is started, the maximum value is maintained and the molten metal A is continuously supplied.

  Therefore, at time T4, the time is 8.0 sec, the load voltage is 160 V, the pin St0 mm, and the gas pressurization is 85 kPa, and the load voltage and the gas pressurization are values that do not change even at the time T5 after 0.5 sec. . However, since the drive of the gate seal center pressurizing pin 50 is started at time T4, the pin St reaches 60 mm at time T5.

  In step (4) from time T4 to time T6, the melt A filled in the cavity 31 is solidified. The closing of the opening 31a by the gate seal center pressurizing pin 50 and the pressurization in the cavity 31 after the time T5 are performed as in the second embodiment, so that a feeder effect can be obtained.

  In addition, since hot water supply becomes unnecessary after the gate St 60 mm of the gate seal center pressurizing pin 50 passes, the load voltage is set to 0 V and the application of the load voltage to the electromagnetic coil 40 is stopped after the time T5. At the same time, the gas pressurization to the pressurization chamber 60 by the gas pressurization control servo valve 61 is stopped and the atmosphere release valve 36 is opened to connect the opening 31a with the outside air, and the molten metal A in the stalk 30 is poured into the pouring chamber 20. Return inside.

  Even after time T5, the pin pressurization by the gate seal center pressurization pin 50 is continued until time T6 of time 16.0 sec, load voltage 0 V, pin St 98 mm, and gas pressurization 0 kPa as described above. In (6) Step 5 after time T6, the same operation and control as in the second embodiment are performed.

  Thus, in the third embodiment, the molten metal A is primed by gas pressurization in the pressurization chamber 60 by the gas pressurization control servo valve 61 and the like, and the electromagnetic induction action and gas pressurization of the electromagnetic coil 40 are performed. In combination, the molten metal A is supplied into the cavity 31 and the product is cast by pressing the gate seal center pressing pin 50. For this reason, similarly to the first and second embodiments, hot water supply using the electromagnetic coil 40 is possible with a simple configuration, and a necessary and sufficient hot-water supply effect can be obtained.

[Fourth Embodiment]
FIG. 6 is a cross-sectional view showing a casting apparatus according to the fourth embodiment of the present invention, and FIG. 7 is a view showing a control pattern of the casting apparatus. 7 shows the degree of decompression, the load voltage, the pin St and the time as in FIG. 2, but the right vertical axis further shows gas pressurization (kPa), which is different from FIG. . As shown in FIG. 6, a casting apparatus 102 according to the fourth embodiment is different from the casting apparatus 101 according to the second and third embodiments in that a gas vent pipe 31b of the casting apparatus 100 according to the first embodiment. In addition, a vacuum system composed of a decompression control servo valve 34 and a vacuum device 35 is added. Since the configuration of each part in the casting apparatus 102 is as described above, the description thereof is omitted here.

  A series of casting operations by the casting apparatus 102 is as shown in FIG. In the fourth embodiment, the casting operation is performed by gas pressurization (priming water) → electromagnetic induction + gas pressurization + decompression (combined filling) → pin pressurization, and the casting process is similar to the above (1) to ( One casting cycle is constituted by the process of 6).

  As shown in FIG. 7, in the (1) initial state at time T0, the melt surface height of the melt A in the pressurizing chamber 60 is determined by the tip of the melt surface sensor 68 disposed at a preset height. The detected level is constant, and as described above, the level of the molten metal A in the pressurizing chamber 60 is always kept constant immediately before the start of casting.

  Further, the electromagnetic coil 40 is in a cut-off state with a load voltage of 0 V, and the pressurization system such as the gas pressurization control servo valve 61 and the pressurization chamber 60 are open to the atmosphere. Since the atmosphere release valve 36 is switched from the open state to the closed state, the atmosphere release line is in the closed state. Further, the vacuum system such as the vacuum device 35 is in a vacuum state.

  As described above, since the pressure reducing control servo valve 34 is on the atmosphere release line side in the initial state, the degassing pipe 31b on the cavity 31 side, the pressure reducing runner, the chill vent 31c, the cavity 31, and the product runner 31d. The opening 31a and the stalk 30 are in communication with the atmosphere.

  Next, in (2) step 1 from time T0 to time T1, the same operation and control as in the second and third embodiments are performed. In addition, in (3) step 2 from time T1 to time T2, the same operation and control as in the second and third embodiments are performed. At time T1, the time is 3.0 sec, the load voltage is 0 V, the degree of decompression is 0 kPa, the pin St0 mm, and the gas pressurization is 20 kPa. At time T2, the time is 6.0 sec, the load voltage is 110 V, the degree of decompression is 0 kPa, the pin St0 mm, and the gas pressure is 40 kPa.

  In step (4) 3 from time point T2 to time point T4, the molten metal A is transferred from the opening 31a to the runner 31d of the product portion by the combined use of electromagnetic induction and gas pressurization and the decompression of the cavity 31. The filling into 31 is completed. That is, in step 3, the load voltage to the electromagnetic coil 40 is further increased, and simultaneously with the application of the load voltage 110V to the electromagnetic coil 40 at time T2, the pressure to the pressurizing chamber 60 by gas pressurization is further increased. Let

  Further, with respect to the pressure reduction in the cavity 31, the back pressure due to the gas in the cavity 31 is reduced and the fluidity is enhanced by the suction action of the molten metal A by the pressure reduction as in the first embodiment. The switching valve is switched to the decompression line side to operate the vacuum device 35 and the like to decompress the cavity 31.

  For this reason, at the time T3 when the maximum load voltage is applied, the time is 6.3 sec, the load voltage is 160 V, the degree of decompression is −50 kPa, the pin St is 0 mm, and the gas pressurization is 75 kPa. At a certain point in time, the degree of decompression is -90 kPa and the gas pressurization is 85 kPa.

  Thus, during only 0.3 sec from time T2 to time T3, the load voltage increases from 110 V to 160 V, the degree of decompression increases from 0 kPa to −50 kPa, and immediately thereafter increases to −90 kPa, Further, the pressure of gas pressurization is increased from 40 kPa to 75 kPa, and immediately thereafter, the pressure is further increased to 85 kPa.

  Note that, at a certain time after time T3, the degree of decompression, the gas pressure and the load voltage are maximized (-90 kPa, 85 kPa, and 160 V) until the filling of the molten metal A is actually completed. The gas pressure and the load voltage need to be held, for example, until the time T4 for the degree of decompression, and the gas pressure and the load voltage until the time T5 (during the holding time).

  That is, the pressure reduction continues until the filling of the melt A into the cavity 31 at the time T4 and the start of driving of the gate seal center pressurizing pin 50 are continued. As for gas pressurization by the gas pressurization control servo valve 61 to the pressurization chamber 60 and load voltage to the electromagnetic coil 40, pin pressurization by the gate seal center pressurization pin 50 after passing through the pin St60mm is started. Until the time T5, the maximum value is maintained and the molten metal A is continuously supplied.

  At time T4, the switching valve of the decompression control servo valve 34 is switched to the atmosphere release line side to stop the operation of the servo valve, so that the decompression in the cavity 31 is stopped, and the degree of decompression at a time before time T5. Becomes 0 kPa. Further, since hot water supply is not required when pin pressure is applied by the gate seal center pressurizing pin 50 at time T5, application of load voltage to the electromagnetic coil 40 is stopped and gas pressurization control servo is performed after time T5. Gas pressurization to the pressurizing chamber 60 by the valve 61 is stopped. At the same time, the atmosphere release valve 36 is opened to allow the opening 31 a to communicate with the outside air, so that the molten metal A in the stalk 30 is returned to the pouring chamber 20.

  The subsequent operations and controls in step 4 and the operations and controls in step (6) after step T6 are the same as those in the first to third embodiments described above. As described above, in the fourth embodiment, the molten metal A is primed by gas pressurization in the pressurizing chamber 60, and the molten metal A is supplied into the cavity by using electromagnetic induction, gas pressurization, and decompression in combination. The casting is performed by pressing the gate seal center pressing pin 50. For this reason, there can exist an effect similar to the 1st-3rd embodiment.

DESCRIPTION OF SYMBOLS 1 Hot-water supply control apparatus 10 Holding chamber 20 Pouring chamber 28 Fixed mold 29 Movable mold 30 Stoke 31 Cavity 31a Opening (pouring gate)
34 Depressurization control servo valve 35 Vacuum device 36 Atmospheric release valve 40 Electromagnetic coil 50 Gate seal center pressurization pin 60 Pressurization chamber 61 Gas pressurization control servo valve 62 Pressure control device 100 Casting device

Claims (4)

A holding chamber for holding a molten metal filled in a cavity of a mold having an opening below;
A pouring chamber that communicates with the holding chamber via a communication passage and is disposed below the mold and accommodates molten metal;
A cylindrical stalk in which the upper end opening communicates with the opening of the cavity and the lower end opening is immersed in the molten metal in the pouring chamber, and
A melt transfer means that has an electromagnetic coil disposed on the outer peripheral side of the stalk above the pouring chamber and transfers the molten metal in the stalk into the cavity by the action of electromagnetic induction;
Pressure reducing means configured to discharge the gas from the cavity and decompress the inside of the cavity so that the molten metal in the stalk can be lifted from the pouring chamber to at least the upper end position of the electromagnetic coil;
A gate seal center pressurizing pin configured to open and close the opening and pressurize the cavity while being configured to be able to advance and retreat with respect to the opening of the cavity and a hot water reservoir communicating with the cavity;
A casting apparatus comprising: a hot water supply control means for performing hot water supply by interlocking control of the pressure reducing means and the molten metal transfer means when the molten metal is filled into the cavity from the pouring chamber. A holding chamber for holding a molten metal filled in a cavity of a mold having an opening below;
A pouring chamber that communicates with the holding chamber via a communication passage and is disposed below the mold and accommodates molten metal;
A pressurizing chamber that communicates with the holding chamber and the pouring chamber via the communication passage and accommodates the molten metal supplied from the holding chamber and forms a sealed space on the upper surface of the molten metal;
A cylindrical stalk in which the upper end opening communicates with the opening of the cavity and the lower end opening is immersed in the molten metal in the pouring chamber, and
A melt transfer means that has an electromagnetic coil disposed on the outer peripheral side of the stalk above the pouring chamber and transfers the molten metal in the stalk into the cavity by the action of electromagnetic induction;
Pressurization configured to be able to lift the molten metal in the stalk from the pouring chamber to at least the upper end position of the electromagnetic coil by supplying gas to the sealed space of the pressurizing chamber and pressurizing the pressurizing chamber Means,
A gate seal center pressurizing pin configured to open and close the opening and pressurize the cavity while being configured to be able to advance and retreat with respect to the opening of the cavity and a hot water reservoir communicating with the cavity;
A casting apparatus, comprising: a hot water supply control means for supplying hot water by interlocking control of the pressurizing means and the molten metal transfer means when the molten metal is filled into the cavity from the pouring chamber. A holding chamber for holding a molten metal filled in a cavity of a mold having an opening below;
A pouring chamber that communicates with the holding chamber via a communication passage and is disposed below the mold and accommodates molten metal;
A pressurizing chamber that communicates with the holding chamber and the pouring chamber via the communication passage and accommodates the molten metal supplied from the holding chamber and forms a sealed space on the upper surface of the molten metal;
A cylindrical stalk in which the upper end opening communicates with the opening of the cavity and the lower end opening is immersed in the molten metal in the pouring chamber, and
A melt transfer means that has an electromagnetic coil disposed on the outer peripheral side of the stalk above the pouring chamber and transfers the molten metal in the stalk into the cavity by the action of electromagnetic induction;
Pressure reducing means for discharging gas from the cavity to decompress the inside of the cavity;
Pressurization configured to be able to lift the molten metal in the stalk from the pouring chamber to at least the upper end position of the electromagnetic coil by supplying gas to the sealed space of the pressurizing chamber and pressurizing the pressurizing chamber Means,
A gate seal center pressurizing pin configured to open and close the opening and pressurize the cavity while being configured to be able to advance and retreat with respect to the opening of the cavity and a hot water reservoir communicating with the cavity;
A casting apparatus comprising: a hot water supply control means for performing hot water supply by interlockingly controlling the decompression means, the pressurization means and the melt transfer means when the molten metal is filled into the cavity from the pouring chamber. . The casting apparatus according to any one of claims 1 to 3, further comprising a plurality of partial pressure pins configured to be movable forward and backward with respect to a bush at an end of the cavity.

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