JP5719221B2 - Molten metal hot water supply device for die-cast sleeve - Google Patents

Description

  The present invention relates to a molten metal hot water supply device for a die cast sleeve used for filling a die cast mold with a molten metal such as molten aluminum, and more particularly to an injection sleeve for feeding a molten metal to a die cast mold. The present invention relates to a molten metal hot water supply apparatus for a die-cast sleeve that supplies molten metal using a pump.

  In die casting, a fixed amount of molten metal is supplied to an injection sleeve provided in a fixed mold, and then the molten metal filled in the injection sleeve with a plunger tip provided at the tip of a plunger driven by hydraulic pressure is used in the mold. Feed into the cavity. By repeating this operation, molten metal is supplied to the cavity of the die-cast mold every casting cycle.

FIG. 10 shows an outline of a die cast casting apparatus provided with such a molten metal filling apparatus.
On the pedestal 51, there are provided a fixed platen 52 fixed on the pedestal 51 and a movable platen 55 that slides on the pedestal 51 left and right in FIG. A fixed mold 53 is attached to the fixed platen 52, and a movable mold 54 is attached to the movable platen 55 via a diver 57. As the movable platen 55 is slid by a hydraulic mechanism (not shown), the movable mold 54 reciprocates in the left-right direction in FIG. 10 and contacts and separates from the fixed mold 53. When the movable mold 54 comes into contact with the fixed mold 53, a cavity 58 is formed between the movable mold 54 and the fixed mold 53.

  An injection sleeve 60 is provided in the fixed mold 53. The injection sleeve 60 is disposed horizontally, and one end side thereof opens to the movable mold 54 side of the fixed mold 53, and the gate is connected to the cavity 58 formed when the movable mold 54 contacts the fixed mold 53. 65 through. On the other hand, the other end side of the injection sleeve 60 protrudes from the stationary platen 52 to the outside, and a molten metal charging port 64 for charging and filling molten metal into the upper portion is opened. A plunger tip 62 is slidably disposed in the injection sleeve 60. The plunger tip 62 is provided at the tip of a plunger rod 63 that is driven by a hydraulic cylinder (not shown).

The movable mold 54 moves as the movable plate 55 slides on the pedestal 51 by a hydraulic mechanism (not shown). The movable mold 54 has an extrusion pin 59 driven by a hydraulic cylinder 56. It is attached. At the time of demolding, which will be described later, the tip of the push pin 59 is pushed into a cavity 58 formed between the movable mold 54 and the fixed mold 53 by the hydraulic cylinder 56, and the molded product in the cavity 58 is pushed out.

  In this die cast casting apparatus, as shown in FIG. 10, the movable mold 54 contacts the fixed mold 53, and a cavity 58 is formed between the movable mold 54 and the fixed mold 53. Further, molten metal is introduced into the injection sleeve 60 from the molten metal inlet 64 by the ladle 61. Thereafter, as shown in FIG. 11, the plunger rod 63 is extended by a hydraulic mechanism (not shown), and the plunger tip 62 at the tip thereof slides in the left direction in the drawing, and the molten metal in the injection sleeve 60 is moved to the gate 65. Through and into the cavity 58.

  In extruding the molten metal, first, the plunger tip 62 passes through the molten metal charging port 64 of the injection sleeve 60, and the molten metal is extruded through the injection sleeve 60 toward the cavity 58, as shown in FIG. As shown, the plunger tip 62 is pushed out at a low speed until the gate 65 is closed. Subsequently, the pushing speed of the plunger tip 62 is increased at once, and the molten metal in the injection sleeve 60 is filled into the cavity 58 from the gate 65 as shown in FIG. Thereafter, the plunger tip 62 decelerates and pressurizes the molten metal in the cavity 58, whereby bubbles contained in the molten metal filled in the cavity 58 are crushed, and the bubbles are contained in the molded product of the cavity 58. It remains as a very small cavity.

After the molten metal is thus completely filled in the cavity 58, the molten metal is cooled by the movable mold 54 and the fixed mold 53, and solidifies in the cavity 58 to become a die-cast casting. Thereafter, the movable mold 54 is moved away from the fixed mold 53 by a hydraulic mechanism (not shown), and the tip of the push pin 59 is pushed out from the movable mold 54 to the fixed mold 53 side by the hydraulic cylinder 56, so that the die casting is performed. The casting is pushed out of the movable mold 54 and demolded. During this time, the plunger tip 62 returns to the original position shown in FIG. Thereafter, by repeating this, castings are sequentially cast.

  However, such a conventional molten metal filling apparatus has the following problems. First, since the molten metal is pumped from the crucible (not shown) by the ladle 61 and filled into the injection sleeve 60 from the molten metal charging port 64, the oxide is pumped from the surface of the crucible by the ladle 61. Further, the molten metal is conveyed by the ladle 61, and while being introduced into the molten metal inlet 64, the surface of the molten metal is exposed to the atmosphere and oxidized. Further, since the molten metal charging port 64 of the injection sleeve 60 is opened, air is easily introduced from the molten metal charging port 64 at the time of hot water supply by a ladle, and the molten metal can easily enter the molten metal in the injection sleeve 60. Is easy to mix. Secondly, the temperature of the molten metal is likely to decrease while the molten metal is pumped from the crucible by the ladle 61 and conveyed to the molten metal inlet 64 of the injection sleeve 60. To avoid this temperature drop, if the temperature of the molten metal in the crucible is increased, moisture in the atmosphere will come into contact with the molten metal and decompose, hydrogen will enter the molten metal during the decomposition, and the molten metal will solidify into a casting Hollows, so-called nests, are likely to occur.

  In order to solve such a problem, for example, as disclosed in Patent Document 1 below, it has been proposed to fill the injection sleeve 60 with the molten metal using an electromagnetic pump for feeding the molten metal. This Patent Document 1 also proposes means for injecting an inert gas such as argon into a portion where molten metal is introduced into an injection sleeve, and preventing the molten metal from contacting and reacting with oxygen in the atmosphere and oxidizing. Has been. Thus, if the molten metal is supplied to the injection sleeve 60 using an electromagnetic pump, many of the problems described above can be solved.

  However, in order to supply molten metal to the injection sleeve 60 using the molten metal electromagnetic pump, it is necessary to connect the duct of the molten metal electromagnetic pump to the injection sleeve 60. However, in the die cast machine, as described above, the movable plate 55 slides on the base 51 with the movable mold 54 and reciprocates for each cycle of casting the casting, and the movable mold 54 is fixed. The contact and separation of the mold 53 are repeated. Also in the injection sleeve 60, the plunger tip 62 reciprocates by the operation of the hydraulic cylinder, and the cavity 58 is repeatedly filled with molten metal. Due to this repeated operation, there is a problem that the connection portion between the molten metal electromagnetic pump and the injection sleeve is not endured and receives vibration, and the connection state deteriorates early.

JP 2002-137051 A JP 2000-126861 A Japanese Patent Laid-Open No. 06-106330

  In view of the above-described problems in the conventional die casting sleeve molten metal filling apparatus described above, the present invention provides an injection sleeve for filling molten metal using a molten metal electromagnetic pump in an injection sleeve of a die casting machine. An object of the present invention is to provide an apparatus for filling molten metal into a die-cast sleeve which prevents early deterioration of a connection portion with a molten metal electromagnetic pump and can be stably operated.

  In the present invention, when the molten metal electromagnetic pump 10 and the injection sleeve 20 are filled with the molten metal from the molten metal electromagnetic pump 10 to fill the injection sleeve 20 in order to achieve the above object, the heat resistance of the molten metal electromagnetic pump 10 and the injection sleeve 20 is increased. Further, by connecting using the shock-absorbing buffer joint 28, the vibration of the connection portion between the injection sleeve 20 and the molten metal electromagnetic pump 10 is absorbed by the buffer joint 28 and buffered.

That is, in the molten metal hot water supply apparatus to the die cast sleeve according to the present invention, the duct 1 ′ of the molten metal electromagnetic pump 10 is connected to the injection sleeve 20 of the die cast machine 21 via the buffer joint 28. The buffer joint 28 is formed by packing a packing material 37 formed by coating a core material 52 made of a metal wire with a graphite 51 into a cylindrical shape to form a packing portion as a conveying path surrounding a molten metal passage, and this packing material. A joint in which a cylindrical packing portion formed by 37 is sandwiched between a pair of flanges 36 and 36 for connecting pipes made of ceramic having heat resistance.

For example, the packing material 37 is formed by using a metal wire as a core material 52 and covering the core material 52 with graphite 51. As the core material 52, for example, a nickel-based alloy having excellent high-temperature characteristics such as heat resistance, corrosion resistance, oxidation resistance, and creep resistance, and a wire material of an alloy of iron, chromium, niobium, and molybdenum ( trade name “Inconel”). Should be used. The core material 52 is covered with graphite 51 and a plurality of ring-shaped packing materials 37 are stacked to form a cylindrical packing portion. Alternatively, a long packing material 37 is closely wound in a spiral shape to form a cylindrical packing portion. The packing portion is sandwiched between a pair of flanges 36 and 36 made of ceramic having heat resistance from both sides, and the flanges 36 and 36 have a duct 1 ′, a nozzle 30, or an injection sleeve 20 of the molten metal electromagnetic pump 10. Connect.

  The outside of the packing portion formed by stacking the packing materials 37 is covered with a bellows 40 made of stainless steel or the like, and both ends of the bellows 40 are fixed to the flanges 36 and 36. A micro heater or the like is incorporated in the bellows 40 to keep the inside of the bellows 40 warm and prevent the molten metal from solidifying through the inside of the packing portion.

In such a buffer joint 28, a metal wire is used as a core material 52, and a packing material 37 having a square cross section in which the core material 52 is coated with graphite 51 is densely and repeatedly stacked in the longitudinal direction of the flow path of the molten metal. Therefore , when the portion is bent , the packing material 37 is shifted little by little to absorb the bending. Further, the packing material 37 absorbs the expansion and contraction in the longitudinal direction of the flow path of the molten metal. Thereby, it can become a coupling which is easy to absorb vibration and displacement. And the packing material 37 which coat | covered the core material 52 which consists of metal wires with the graphite 51 has high heat resistance and corrosion resistance.

  As described above, in the molten metal hot water supply apparatus for the die cast sleeve according to the present invention, the injection sleeve 20 of the die cast machine 21 and the molten metal electromagnetic pump 10 are connected via the buffer joint 28 as described above. Even when the die-casting machine 21 repeats the casting cycle, the buffer joint 28 absorbs vibration and displacement of the connection portion and stably holds the connection portion. And since it is also the buffer joint 28 which has high tolerance with respect to the temperature and corrosion of a molten metal, the molten metal hot-water supply apparatus to a die-cast sleeve with high reliability is obtained.

It is sectional drawing which shows one Example of the molten metal hot-water supply apparatus to a die-casting sleeve. It is principal part sectional drawing from another direction which shows one Example of the molten metal hot-water supply apparatus to a die-casting sleeve. It is a front view which shows the buffer joint of the molten metal hot-water supply apparatus to a die-casting sleeve. FIG. 4 is a half sectional view in the direction A of FIG. 3. It is sectional drawing which shows the example of the packing material used for the buffer joint shown in FIG. 3 and FIG. It is sectional drawing which shows the example of the bellows used for the buffer joint shown in FIG. 3 and FIG. It is sectional drawing which shows the other Example of the molten metal hot-water supply apparatus to a die-casting sleeve. It is sectional drawing which shows the other Example of the molten metal hot-water supply apparatus to a die-casting sleeve. It is principal part sectional drawing from another direction which shows the other Example of the molten-metal hot-water supply apparatus to a die-casting sleeve. It is sectional drawing which shows the prior art example of a die-casting machine. It is sectional drawing which shows operation | movement of the prior art example of a die-cast machine.

In the present invention, the molten metal electromagnetic pump 10 is used to fill the injection sleeve 20 of the die casting machine 21 with molten metal, and the molten metal electromagnetic pump 10 and the injection sleeve 20 are provided with a shock-absorbing joint 28 having special earthquake resistance. Use and connect to achieve its purpose.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

1 and 2 show an embodiment of a molten metal filling apparatus for a die-cast sleeve according to the present invention.
This molten metal hot water supply apparatus for the die cast sleeve fills the injection sleeve 20 of the die cast machine 21 with the molten metal using a molten metal electromagnetic pump. As shown in FIG. 2, the die cast machine 21 includes a fixed die 37 attached to the fixed platen 36, a movable die 38 attached to a movable platen (not shown) and contacting and separating from the fixed die 37. It has a mold consisting of As shown in FIG. 2, when the movable mold 38 comes into contact with the fixed mold 37, a cavity 31 serving as a space for molding a casting is formed therebetween.

  As shown in FIG. 2, a plunger tip 34 provided at the tip of a plunger 33 driven by a hydraulic cylinder (not shown) is slidably inserted into the injection sleeve 20. The injection sleeve 20 is provided with a molten metal inlet opening upward. When the plunger tip 34 is pushed leftward in FIG. 2 by the plunger 33, the molten metal supplied to the injection sleeve 20 from the inlet is filled into the cavity 32 through the gate 32.

  As shown in FIG. 1, a molten metal electromagnetic pump 10 for supplying molten metal to the injection sleeve 20 has an inductor, and the molten metal 12 stored in a molten metal tank 11 is injected by the electromagnetic action. Supply to the sleeve 20. In the example shown in FIG. 1, the molten metal electromagnetic pump has a two-stage inductor of an upper hot water supply inductor 14 and a lower rising inductor 24.

  The pump side duct 1 is disposed obliquely, and the lower end of the pump side duct 1 is inserted into the molten metal 12 accommodated in the molten metal tank 11. An upper hot water supply inductor 14 in which a coil 16 is wound around a yoke 15 made of a magnetic material is disposed around a portion of the pump side duct 1 that is above the liquid level of the molten metal 12. The yoke 15 is fitted on the outer peripheral side so as to surround a portion of the pump side duct 1 that is above the liquid level of the molten metal 12, and a coil 16 constituting a three-phase coil is wound around the yoke 15. Yes. The hot water supply inductor 14 is provided with a cooler 23 and is cooled during driving.

  Further, a rising inductor 24 is arranged around the portion below the hot water supply inductor 14 in the pump side duct 1. As with the hot water supply inductor 14, the rising inductor 24 is formed by winding a coil 26 around a magnetic yoke 25 fitted on the outer periphery of a portion below the inductor 14 of the pump side duct 1. It is a thing. The coil 26 of the rising inductor 24 is wound around an inorganic insulating cable having heat resistance. An inorganic insulated cable has a structure in which a conductive wire is housed in a sheath made of a stainless steel tube or the like, and an inorganic insulating powder such as magnesia powder is filled between the conductive wire and the sheath for insulation. It is called a so-called sheath cable. Such an inorganic insulated cable has high heat resistance and can withstand a temperature of 800 ° C. For this reason, the startup inductor 24 is suitable for energizing a large current while having no cooling without a cooling means, and accordingly, the startup inductor 24 is compared with the coil 16 of the hot water supply inductor 14 by that amount. The number of turns of the coil 26 can be reduced.

  The rising inductor 24 is surrounded by a cylindrical protective case 17 made of heat-resistant ceramic or the like. The upper end opening of the protective case 17 is fixed to the lower end surface of the upper hot water supply inductor 14. The opening at the lower end of the protective case 17 is closely joined to the lower end of the pump-side duct 1, and the inside surrounded by the joint is the introduction of the molten metal 12 at the lower end of the pump-side duct 1. Mouth 18

  A hot water supply side duct 1 ′ composed of a square elbow pipe is closely connected to the upper end of the pump side duct 1 via joints 5 and 5 ′ such as flange joints. A flange 6 extends around one end portion of the protective tube 3 near the hot water supply side duct 1 ′, and a portion close to the outer periphery of the flange 6 connects the pump side duct 1 and the hot water supply side duct 1 ′. It is sandwiched between the joints 5 and 5 ′. As a result, the cores 2 and 22 in the protective tube 3 are held so as to be positioned at the center of the pump-side duct 1. The flange 6 is provided with a plurality of arc-shaped passage holes 7 serving as passages for the molten metal 12. The hot water supply side duct 1 ′ is elastically pressed against the pump side duct 1 in front by a spring or the like (not shown). In this state, the sealability of the joints 5 and 5 'is ensured by the heat-resistant gasket inserted between the joints 5 and 5'.

These pump side duct 1 and hot water supply side duct 1 'are made of a heat-resistant and corrosion-resistant material such as ceramic, and are melted by heaters 9 and 9' composed of a microheater for heat insulation provided on the outer periphery thereof. Heated to a temperature equal to or higher than the melting point of the metal 12 to prevent the molten metal 12 from solidifying.
A sensor 13 such as a liquid level sensor is provided on the molten metal 12 in the molten metal tank 11, whereby the liquid level of the molten metal 12 in the molten metal tank 11 is detected. The rising inductor 24 is inserted below the liquid level of the molten metal 12 detected by the sensor 13.

  A molten metal nozzle 30 is connected to the tip of the hot water supply side duct 1 ′. The tip of the molten metal nozzle 30 facing downward is inserted into the molten metal inlet of the injection sleeve 20. The molten metal nozzle 30 is connected to the injection sleeve 20 through a buffer joint 28. A buffer seal packing 35 is inserted between the injection sleeve 20 and the buffer joint 28 so that the buffering property and the airtightness of the injection sleeve 20 and the buffer joint 28 are maintained.

  A molten metal level gauge 19 is provided at the upper end of the molten metal nozzle 30, whereby the liquid level of the molten metal in the injection sleeve 20 is detected from the tip portion of the molten metal nozzle 30, that is, the molten metal charging port. . Further, a gas nozzle 27 for ejecting an inert gas such as argon and a leak valve 45 are provided in this portion. A gas cylinder (not shown) storing an inert gas such as argon is connected to the gas nozzle 27 via a valve or an injector (not shown). From this gas nozzle 27, in order to cut the flow over the weir 29 in cooperation with stopping the hot water supply of the molten metal electromagnetic pump 10 described above, gas is jetted toward the tip of the molten metal nozzle 30 in a timely manner. . The leak valve 45 is used to discharge the gas in the molten metal nozzle 30 to the outside in a timely manner.

  A dam 29 is provided at a terminal portion of the hot water supply side duct 1 ′, which is a connection portion between the hot water supply side duct 1 ′ and the molten metal nozzle 30. The weir 29 has a raised shape such that the flow path bottom surface of the hot water supply side duct 1 ′ is one step higher than the front portion. From the hot water supply side duct 1 ′, the molten metal flows over the weir 29 toward the molten metal nozzle 30.

  3 and 4 show the buffer joint 28 described above. In this buffer joint 28, a plurality of ring-shaped packing materials 37 having the same inner and outer diameters are stacked so as to be cylindrical, and a plurality of packing materials 37 having a larger inner and outer diameter are stacked on the outside so as to be cylindrical. The cylindrical packing part used as the metal flow path is formed. Alternatively, the long packing material 37 may be spirally wound into a coiled coil shape to form a cylindrical packing portion serving as a molten metal flow path. In any case, the adjacent packing members 37 are densely stacked to form a cylindrical packing portion, which serves as a molten metal flow path.

For example, as shown in FIG. 5 (A), a plurality of packing materials 37 having the same inner and outer diameters and having a rectangular cross section are stacked in a cylindrical shape, and a packing material 37 having a larger inner and outer diameter is formed on the outside. A plurality of cylinders are stacked so as to form a cylindrical shape, and a cylindrical packing portion serving as a molten metal flow path is formed. Alternatively, as shown in FIG. 5B, a metal wire is used as a core material 52, and a packing material 37 having a square cross section coated with graphite 51 is formed into a spirally wound coil shape so that the flow of molten metal You may form the cylindrical packing part used as a path | route. In any case, the adjacent packing members 37 are densely stacked to form a cylindrical packing portion, which serves as a molten metal flow path.

  As the core material 52, for example, an alloy (trade name “Inconel”) such as iron, chromium, niobium, molybdenum, etc., which is based on nickel having excellent high temperature characteristics such as heat resistance, corrosion resistance, oxidation resistance, and creep resistance. Of the wires, those having a high temperature spring property are suitable. This is coated with graphite 51 to form the above-described ring-shaped or closely wound coil-shaped packing material 37.

  As shown in FIG. 4, the packing portion made of the packing material 37 is sandwiched between a pair of flanges 36, 36 for pipe connection made of ceramic having heat resistance from both sides. The flanges 36 and 36 are made of ceramic having heat resistance such as silicon nitride and corrosion resistance to molten aluminum.

  A bellows 40 made of a thin metal plate such as stainless steel as shown in FIG. 6 is put on the outer side of the packing material 37, and both ends of the bellows 40 are joined together with the flange presser fittings 39, 39 to sandwich the flanges 36, 36. , 38 to the flanges 36, 36. By incorporating a micro heater or the like into the bellows 40 and keeping the packing material 37 inside the bellows 40, solidification of the molten metal passing through the inside of the packing portion is prevented.

  In the injection sleeve 20, as the plunger tip 34 shown in FIG. 2 slides, the molten metal is vibrated or displaced every time a certain amount of molten metal is injected into the cavity 31 of the die-casting machine 21. 1 'and the molten metal nozzle 30. At this time, since the packing material 37 is stacked in the buffer joint 28, the packing material 37 slides against each other to absorb vibrations and displacement, and the hot water supply side duct 1 ′ and the molten metal nozzle 30 before and after the packing material 37 are slid. Reduce the applied vibration and displacement. Thereby, even if the plunger tip 34 slides in the injection sleeve 20, it is possible to prevent the molten metal from leaking at the joint portion.

  In such a molten metal hot water supply apparatus to the die-cast sleeve, first, the riser inductor 24 is driven, the molten metal 12 in the molten metal tank 11 is pumped into the pump side duct 1, and the molten metal in the pump side duct 1 is taken up. Pumping up to a level at which the electromagnetic force of the hot water supply inductor 14 acts. Thereafter, when the output of the hot water supply inductor 14 is further increased, the molten metal in the pump side duct 1 is pushed up, the molten metal 12 rises in the hot water supply side duct 1 ′, and the level reaches the height of the weir 29. This level is a state immediately before filling the injection sleeve 20 with molten metal through the hot water supply side duct 1 ', that is, a hot water supply standby state. In this hot water supply standby state, the output of the hot water induction inductor 14 is gradually increased, and the output of the rising inductor 24 is decreased by a certain amount and brought to zero. The level of the molten metal 12 is maintained at the level of the aforementioned weir 29.

Next, the output of the hot water induction inductor 14 of the molten metal electromagnetic pump 10 is further increased from the level of the hot water supply standby state, and the molten metal is raised above the height of the hot water supply standby state, so that the molten metal causes the weir 29 to enter. Overflow, the molten metal flows into the injection sleeve 20 through the molten metal nozzle 30 and is filled. At this time, an inert gas is injected from the gas nozzle 27 into the molten metal nozzle 30 to make the inside of the molten metal nozzle 30 an inert gas atmosphere. At the same time, the molten metal liquid level gauge 19 detects the height of the molten metal surface over the weir 29 and measures the flow rate, and the predetermined amount of hot water is supplied from the tip of the molten metal nozzle 30, that is, from the molten metal charging port to the injection sleeve 20. Hot water is supplied to the molten metal.

  Next, when the molten metal level gauge 19 detects the height of the hot water surface that overflows the weir 29 and reaches a predetermined flow rate, the output of the hot water induction inductor 14 of the molten metal electromagnetic pump 10 is lowered to supply hot water. The molten metal level in the side duct 1 ′ is returned to the height of the weir 29. Thereby, the overflow of the molten metal from the hot water supply side duct 1 ′ to the molten metal nozzle 30 side is stopped. At the same time, the inert gas injected from the gas nozzle 27 into the molten metal nozzle 30 causes the molten metal remaining in the molten metal nozzle 30 to be sent out to the injection sleeve 20 to complete the filling.

Thereafter, the plunger tip 34 shown in FIG. 2 moves leftward in the drawing, and the molten metal filled in the injection sleeve 20 is filled into the mold cavity 31 of the die cast machine 21 through the gate 32. The operation of the plunger tip 34 at this time is the same as the conventional one described above. Thereafter, casting is performed, and the plunger tip 34 shown in FIG. 2 returns to the right in FIG.
Thereafter, while repeating this, casting by filling the cavity 31 with molten metal is performed.

When the molten metal is supplied from the molten metal nozzle 30 to the injection sleeve 20 and the flow rate of the molten metal ejected from the molten metal nozzle 30 is too high, the reaction causes the molten metal to move from the wall of the injection sleeve 20 to the molten metal. It may bounce back to the nozzle 30 side. In such a case, it is preferable to slightly tilt the molten metal nozzle 30 so that the tip thereof faces the gate 32 side or the opposite side.

Next, another embodiment of the molten metal hot water supply apparatus for the die cast sleeve shown in FIG. 7 will be described.
In the embodiment shown in FIG. 1, the molten metal nozzle 30 is set up vertically and connected to the injection sleeve 20 with its tip directly below. On the other hand, in the embodiment shown in FIG. 7, the molten metal nozzle 30 is inclined. In the embodiment shown in FIG. 1, the hot water supply side duct 1 ′ connected to the molten metal nozzle 30 is leveled and connected to the molten metal nozzle 30, but in the embodiment of FIG. 7, it is installed obliquely. A hot water supply side duct 1 ′ is connected to the extension of the pump side duct 1, and a molten metal nozzle 30 is directly connected to the oblique hot water side duct 1 ′. The bottom surfaces of the hot water side duct 1 ′ and the molten metal nozzle 30 are the highest at their connecting portions, and that portion becomes the weir 29.

  The other configurations in the embodiment shown in FIG. 7 are basically the same as those in the embodiment of the molten metal hot water supply apparatus for the die-cast sleeve described above with reference to FIGS. 1 to 3, and the same portions are indicated by the same reference numerals. . The operation is basically the same. The buffer joint 28 used is the same as that described above with reference to FIGS. Since those details are duplicated, the description thereof is omitted.

Next, another embodiment of the molten metal hot water supply apparatus for the die cast sleeve shown in FIGS. 8 and 9 will be described.
A hot water supply side duct 1 ′ formed of a square elbow pipe is closely connected to the upper end of the pump side duct 1 of the molten metal electromagnetic pump 10 via joints 5 and 5 ′ such as flange joints. A flange cylinder 50 is provided at the upper part of the intermediate portion of the hot water supply side duct 1 ′. In this flange cylinder 50 , a molten metal liquid level gauge 19 is provided, whereby the height of the molten metal liquid level in the hot water supply side duct 1 ′ is detected. Further, the flange cylinder 50 is provided with a blowout port of a gas nozzle 27 for ejecting an inert gas such as argon. A gas cylinder (not shown) storing an inert gas such as argon is connected to the gas nozzle 27 via a valve or an injector (not shown). From this gas nozzle 27, gas is injected into the supply side duct 1 ′. Further, the flange cylinder 50 is provided with a blowout port of a lubricant nozzle 41 for injecting a lubricant toward the molten metal supply port 42 of the injection sleeve 20. From the lubricant nozzle 41, the lubricant is injected from the molten metal supply port 42 into the injection sleeve 20.

  The front end of the hot water supply side duct 1 ′ is connected to a molten metal supply port 42 provided on the side surface of the injection sleeve 20 via a buffer joint 28. A spring 44 is inserted behind the hot water supply side duct 1 ′ between the spring receiving member 43 and the reaction force wall, and the tip of the hot water supply side duct 1 ′ is injected through the buffer joint 28 by the elasticity of the spring 44. 20 is pressed against. Further, a buffer seal packing 35 is inserted between the injection sleeve 20 and the buffer joint 28, so that the buffering property and airtightness of the injection sleeve 20 and the buffer joint 28 are maintained. The configuration of the buffer joint 28 is the same as that described above with reference to FIGS.

The molten metal supply port 42 to which the hot water supply side duct 1 ′ is connected is a circular opening in the illustrated example, but the lower half thereof is blocked by the weir 29. Specifically, the weir 29 has a shape in which the lower half of the molten metal supply port 42 is raised. Molten metal flows from the hot water supply side duct 1 ′ over the weir 29 to the injection sleeve 20 side.
A lubricant injection port 43 for injecting the lubricant into the plunger tip 34 is provided at the upper end of the injection sleeve 20 from the molten metal supply port 42, that is, above the standby position of the plunger tip 34.

  In such a molten metal filling device into the die-cast sleeve, first, the rising inductor 24 is driven, the molten metal 12 in the molten metal tank 11 is pumped up to the pump side duct 1, and the molten metal in the pump side duct 1 is taken up. Pumping up to a level at which the electromagnetic force of the hot water supply inductor 14 acts. Thereafter, when the output of the hot water supply inductor 14 is further increased, the molten metal in the pump side duct 1 is pushed up, the molten metal 12 rises in the hot water supply side duct 1 ′, and the level reaches the height of the weir 29. This level is a state immediately before filling the injection sleeve 20 with molten metal through the hot water supply side duct 1 ', that is, a hot water supply standby state. In this hot water supply standby state, the output of the hot water induction inductor 14 is gradually increased, the output of the rising inductor 24 is decreased by a certain amount, and the level of the molten metal 12 of the pump side duct 1 is determined only by the output of the hot water induction inductor 14. Is maintained at the height of the aforementioned weir 29.

  The level of molten metal in the hot water supply side duct 1 ′ is detected by a molten metal level gauge 19 provided in the flange cylinder 30, and the flow rate overflowing from the weir 29 is measured. The aforementioned output control of the metal electromagnetic pump 10 is performed. Further, an inert gas such as argon is jetted from the gas nozzle 27 piped in the flange cylinder 30 into the hot water supply side duct 1 ′. Thereby, the inside of the hot water supply side duct 1 ′ is maintained in an inert gas atmosphere, and oxidation of the molten metal therein is prevented.

  Next, the output of the hot water induction inductor 14 of the molten metal electromagnetic pump 10 is further increased from the level of the hot water supply standby state, and the molten metal is raised above the height of the hot water supply standby state so that the molten metal causes the weir 29 Overflow, flow into the injection sleeve 20 and hot water is supplied. 8 differs greatly from the other FIG. 1 and FIG. 7 in that the injection sleeve 20 is directly provided with the weir 29, so that the predetermined hot water supply amount can be controlled only by detecting the molten metal surface. When the liquid level of the molten metal in the hot water supply side duct 1 ′ detected by the metal level gauge 19 reaches a predetermined height, the output of the hot water induction inductor 14 of the molten metal electromagnetic pump 10 is lowered to supply hot water. The molten metal level in the side duct 1 ′ is returned to the height of the weir 29. Thereby, the overflow of the molten metal from the hot water supply side duct 1 ′ to the molten metal nozzle 30 side is stopped, and the excess molten metal remaining in the injection sleeve 20 flows over the weir 29 and returns to the hot water supply side duct 1 ′ side. . Thereby, the hot water supply of the molten metal to the injection sleeve 20 is completed.

  Thus, the level of the molten metal filled in the injection sleeve 20 is just up to the height of the weir 29. The required amount of molten metal to fill the injection sleeve 20 is generally about ½ of the internal volume of the injection sleeve 20. The height of the weir 29 is designed and provided so as to correspond to the required filling amount of the molten metal in the injection sleeve 20. However, since the amount of hot water returning from the injection sleeve increases when the weir 29 is greatly overflowed, and the temperature of the return hot water is lowered, it affects the next hot water supply, so an appropriate hot water supply with less return hot water is desirable. Needless to say.

  Thereafter, the plunger tip 34 shown in FIG. 9 moves to the left in the drawing, and the molten metal filled in the injection sleeve 20 is filled into the mold cavity 31 of the die cast machine 21 through the gate 32. The operation of the plunger tip 34 at this time is the same as the conventional one described above. Thereafter, casting is performed, and the plunger tip 34 shown in FIG. 9 returns to the right in FIG.

  In such operation of the plunger tip 34, in accordance with the movement of the plunger tip 34, the lubricant nozzle 41 provided in the flange cylinder 30 is directed toward the plunger tip 34 passing through the molten metal supply port 42 of the injection sleeve 20. The lubricant can be injected. The reciprocating movement of the plunger tip 34 in the injection sleeve 20 can be made smooth.

  8 and 9 is basically the same as the embodiment of the molten metal hot water supply apparatus for the die-cast sleeve described above with reference to FIGS. 1 to 3, and the same parts are designated by the same reference numerals. Show. The buffer joint 28 used is the same as that described above with reference to FIGS. Since those details are duplicated, the description thereof is omitted.

The molten metal hot water supply apparatus for the die cast sleeve according to the present invention can be used to fill the injection sleeve of the die cast machine with a molten metal such as molten aluminum, so that the aluminum die cast casting can produce a relatively small casting in large quantities. It can be used in such fields.

1 'Molten Metal Electromagnetic Pump Duct 10 Molten Metal Electromagnetic Pump 20 Injection Sleeve 21 Die Casting Machine 28 Buffer Joint 31 Cavity 36 Flange 37 Packing Material 51 Graphite 52 Core Material

Claims (5)

In a molten metal hot water supply device for a die cast sleeve for filling a molten metal into an injection sleeve (20) for filling a molten metal for casting into a cavity (31) of a die cast machine (21), a molten metal electromagnetic pump ( The duct (1 ′) of 10) is connected to the injection sleeve (20) of the die-casting machine (21) via a buffer joint (28), and this buffer joint (28) is connected to the core (52) of the metal wire. The packing material (37) coated with graphite (51) is stacked in a cylindrical shape to form a packing portion as a conveying path surrounding the molten metal passage, and the cylindrical packing formed by the packing material (37) Molten metal hot water supply to a die-cast sleeve, characterized in that the joint is sandwiched between a pair of pipe-connecting flanges (36) and (36) made of ceramic having heat resistance apparatus. The die-cast sleeve according to claim 1, wherein the packing material (37) comprises a metal wire as a core material (52), and the core material (52) is coated with graphite (51). Molten metal water heater. The molten metal hot water supply apparatus for a die-cast sleeve according to claim 2, wherein the core material (52) is made of nickel and is made of an iron, chromium, niobium, or molybdenum alloy wire. The molten metal hot-water supply apparatus for the die-cast sleeve according to any one of claims 1 to 3, wherein a plurality of ring-shaped packing materials (37) are stacked closely to form a cylindrical packing portion. The molten metal hot water supply apparatus for a die-cast sleeve according to any one of claims 1 to 3, wherein a long packing material (37) is closely wound in a spiral shape to form a cylindrical cylindrical packing portion. .

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