JP2012223778A - Apparatus for supplying molten metal to die cast sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start or stop the supply of molten metal more accurately in accordance with the operation of an electromagnetic pump to start or stop the supply of the molten metal, and simultaneously, prevent oxidation of the molten metal.SOLUTION: A molten metal supply port 42 is provided to the side surface of an injection sleeve 20, and a molten metal supply duct 1' of a molten metal electromagnetic pump 10 is connected horizontally to the molten metal supply port 42. A dam 29 is provided to the molten metal supply port 42, over which the molten metal flows from the molten metal supply duct 1' of the molten metal electromagnetic pump 10 to the inside of the injection sleeve 20, and the molten metal overflows the dam 29 and is charged to the injection sleeve 20. An inert gas is blown from a gas nozzle 27 provided to the molten metal supply duct 1' of the molten metal electromagnetic pump 10. The operation of the molten metal electromagnetic pump 10 is controlled while confirming the level of the molten metal in the molten metal supply duct 1' by a level meter 19 provided to the molten metal supply duct 1' of the molten metal electromagnetic pump 10.

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

FIG. 4 shows an outline of a die cast casting apparatus provided with such a molten metal hot water supply apparatus.
On the pedestal 51, there are provided a fixed platen 52 fixed on the pedestal 51 and a movable platen 55 that slides left and right on the pedestal 51 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. 4 and contacts and separates from the fixed mold 53. When the movable mold 54 comes into contact with the fixed mold 53 side, 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 arranged horizontally, one end side thereof opens to the movable mold 54 side of the fixed mold 53, and the cavity 58 formed when the movable mold 54 contacts the fixed mold 53 is It communicates through the gate 65. 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), and an extrusion pin 59 driven by a hydraulic cylinder 56 is attached to the movable mold. It has been. 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 casting apparatus, as shown in FIG. 4, 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. 5, the plunger rod 63 is extended by a hydraulic mechanism (not shown), 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 these 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 into the cavity 58, the molten metal is cooled by the movable mold 54 and the movable mold 53, and the molten metal is solidified in the cavity 58 to form a die 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, die 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 can easily enter the molten metal in the injection sleeve 60 from the molten metal charging port 64, and oxide can be easily mixed with the casting. 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. When the temperature of the molten metal in the crucible is increased in order to avoid this temperature drop, the moisture in the atmosphere comes into contact with the molten metal and decomposes, and the decomposed hydrogen enters the molten metal, and cavities, so-called nests, are easily formed in the casting.

  In response to such a problem, for example, as disclosed in Patent Document 1 below, it has also been proposed to supply molten metal to the injection sleeve 60 using an electromagnetic pump that delivers 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, even if argon gas is supplied to the injection sleeve and the oxide is reduced, the molten metal is viscous. Therefore, when the molten metal is supplied to the injection sleeve 60 using the electromagnetic pump, the electromagnetic pump is precisely controlled. However, it is difficult to fill the injection sleeve 60 with an accurate amount of the molten metal every time because the hot water is not constant at the nozzle when the molten metal is supplied. In particular, when the molten metal put into the injection sleeve 60 is stopped by an electromagnetic pump, the flow of the molten metal does not stop immediately due to the inertia and viscosity of the molten metal. This is a big problem for quantitative control of the molten metal supply amount.

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

  In view of the above-mentioned problems in the conventional molten metal filling apparatus for the die-cast sleeve described above, the present invention more accurately supplies and stops molten metal in accordance with the operation of starting and stopping the supply of molten metal by an electromagnetic pump. An object of the present invention is to provide a molten metal hot water supply apparatus for a die-cast sleeve that can be used and at the same time can prevent oxidation of molten metal.

  In the present invention, when the molten metal is introduced from the molten metal electromagnetic pump 10 to the injection sleeve 20 of the die-cast machine 21 through the nozzle 30 in order to achieve the above object, the molten metal supply port 42 is provided on the side surface of the injection sleeve 20. The dam 29 is provided in the molten metal supply port 42 so that the molten metal is filled into the injection sleeve 20 through the dam 29 from the molten metal electromagnetic pump 10 side.

  That is, the molten metal filling apparatus for the die-cast sleeve according to the present invention is provided with a molten metal supply port 42 on the side surface of the injection sleeve 20, and a hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10 is connected to the molten metal supply port 42. The molten metal supply port 42 is provided with a weir 29 where the molten metal overflows into the injection sleeve 20 from the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10, and the molten metal is injected through the weir 29. Hot water is supplied into the sleeve 20. In this case, the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10 is preferably connected horizontally to a molten metal supply port 42 provided on the side surface of the injection sleeve 20. Generally, the amount of hot water supplied to the injection sleeve is 50% to 40% of the inner diameter, and the height of the weir 29 is preferably designed in advance according to the amount of hot water supplied.

  A gas nozzle 27 is provided in the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10, and an inert gas is blown from the gas nozzle 27 into the hot water supply side duct 1 ′. The algon gas injected from the gas nozzle 27 is exhausted to the cavity 31 side through the gate 32 leading to the cavity and is also exhausted to the outside air through the leak valve 45, and the argon gas pressure in the injection sleeve increases. And we must make sure that it does not affect hot water supply.

  Further, the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10 is provided with a level meter 19 that detects the level of the molten metal in the duct 1 ′ and measures the flow rate, and confirms the level of the molten metal in the hot water supply side duct 1 ′. Then, the operation of the molten metal electromagnetic pump 10 is controlled. The level meter 19 is preferably an electromagnetic induction type level meter that can measure an average liquid level even with molten metal that easily generates ripples.

  In the molten metal hot water supply apparatus to the die-cast sleeve having such a configuration, when the molten metal electromagnetic pump 10 starts supplying molten metal, the level of the hot water flowing over the weir 29 from the hot water supply side duct 1 ′ by the level meter 19. Then, the flow rate of the molten metal is measured, and the molten metal is supplied to the injection sleeve 20. After a certain amount of molten metal is supplied to the injection sleeve 20, when the molten metal supply is stopped by the operation of the molten metal electromagnetic pump 10, the molten metal electromagnetic pump 10 operates to move the molten metal in the hot water supply side duct 1 ′. Decrease the level. Then, the molten metal on the hot water supply side duct 1 ′ is blocked by the dam 29, and the inertia of the flow of the molten metal is cut off so that the hot metal runs out, so that the excess molten metal does not overflow into the spray sleeve 20. When excess molten metal is supplied to the injection sleeve 20 side, the excess molten metal flows over the weir 29 and returns to the hot water supply side duct 1 ′. Accordingly, the injection sleeve 20 can be supplied with a certain amount of molten metal determined by the height of the weir 29.

  That is, the injection sleeve 20 can be filled with molten metal by the height of the weir 29 of the molten metal supply port 42. Therefore, for example, when the height of the weir 29 of the molten metal supply port 42 is in the middle of the injection sleeve 20, the molten metal can be supplied to the injection sleeve 20 to the middle level. However, since the hot water returning from the injection sleeve 20 increases when the dam 29 overflows significantly, and the temperature of the return hot water decreases, it affects the next hot water supply. It goes without saying that it is desirable.

  When the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10 is connected horizontally to the molten metal supply port 42 provided on the side surface of the injection sleeve 20, the cross section of the hot water supply side duct 1 ′ is long and wide. Only by slightly raising the level of the molten metal in the hot water supply side duct 1 ′ with the electromagnetic pump 10, a larger amount of molten metal can be supplied beyond the weir 29.

  Further, by providing a gas nozzle 27 in the hot water supply side duct 1 ′ and injecting an inert gas from the gas nozzle 27, the inside of the molten metal nozzle 30 becomes an inert gas atmosphere, and oxidation of the molten metal does not occur in the nozzle 30. . Furthermore, by controlling the operation of the molten metal electromagnetic pump 10 while confirming the level of the molten metal in the duct 1 ′ with a level meter 19 provided in the hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10, accurate melting is performed. Metal hot water control can be performed.

  As described above, in the molten metal hot water supply apparatus to the die-cast sleeve according to the present invention, the above-described separation operation of the molten metal by the weir 29 and the appropriate flow rate control by the flow rate obtained from the weir 29 using the level meter 19 The injection sleeve 20 can be filled with an accurate amount of molten metal each time by the return of molten metal between the hot water supply side duct 1 and the injection sleeve 20 across the weir 29. Furthermore, by oxidizing the inert gas from the gas nozzle 27, oxidation of the molten metal in the molten metal nozzle 30 can be prevented.

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 an expanded sectional view of the joint part of the molten metal nozzle of FIG. 1 which shows one 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, a molten metal supply port 42 is provided on the side surface of the injection sleeve 20, a hot water supply side duct 1 ′ is connected to the molten metal supply port 42, a level meter 19 is provided, and a weir 29 is provided in the molten metal supply port 42. The molten metal is supplied to the injection sleeve 20 by flowing the molten metal over the weir 29 from the molten metal electromagnetic pump 10 side, and the object is achieved.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

1-3 is one Example of the molten metal hot-water supply apparatus to the die-casting sleeve by this invention.
This molten metal filling device for a die cast sleeve fills the injection sleeve 20 of the die cast machine 21 with a 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 that becomes a space for molding a casting is formed between them.

  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. Further, a molten metal filling port 42 is formed on the side surface of the injection sleeve 20. When the plunger tip 34 is pushed leftward in FIG. 2 by the plunger 33, the molten metal filled in the injection sleeve 20 from the inlet is filled into the cavity 32 through the gate 32. The molten metal filling port 42 of the injection sleeve 20 will be described later.

  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. A cylindrical protective tube 3 is coaxially inserted inside the pump-side duct 1, and the cores 2 and 22 in the protective tube 3 are made of a magnetic material and are generated by the inductors 14 and 24. This is to increase the magnetic force.

  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 flange cylinder 30 is provided at the upper part of the intermediate portion of the hot water supply side duct 1 ′. In the flange tube 30, 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 30 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 ′. In this portion, a gas nozzle 27 for ejecting an inert gas such as argon and a leak valve 41 are provided. The leak valve 41 is used to discharge the gas in the molten metal nozzle 30 to the outside in a timely manner.

  In addition to these gas piping systems, the flange cylinder 30 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 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.

  FIG. 3 shows a portion of 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.

  As the packing material 37, a core material such as a metal wire coated with graphite can be used. The core material is, for example, nickel, which has excellent high-temperature characteristics such as heat resistance, corrosion resistance, oxidation resistance, and creep resistance, and a wire material of an alloy such as iron, chromium, niobium, molybdenum (trade name “Inconel”). Of these, a material excellent in high temperature spring property is suitable. This is coated with graphite to form the aforementioned ring-shaped or closely-wound coil-shaped packing material 37.

The packing portion made of the packing material 37 is sandwiched by a pair of flanges 36 and 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 is placed outside the packing material 37. Both ends of the bellows 40 are fixed to the flanges 36 and 36 by bellows pressing metal fittings 38 and 38 sandwiching the flanges 36 and 36 together with the flange pressing metal fittings 39 and 39.

One of the flanges 36 is connected to the hot water supply side duct 1 ′. As described above, the other flange 16 is connected to the molten metal supply port 42 of the injection sleeve 20 with the buffer seal packing 35 inserted.
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 materials 37 are stacked, the packing materials 37 slide against each other to absorb vibration and displacement, and vibration and displacement exerted on the hot water supply side duct 1 ′ and the molten metal nozzle 30 before and after the packing material 37 are absorbed. Make it smaller. 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, and the level of the molten metal 12 rises in the hot water supply side duct 1 ′ and 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 lowered to zero, and only the output of the hot water induction inductor 14 is used for the pump side duct 1. The level of the molten metal 12 is maintained at the height of the aforementioned weir 29.

  The level of the 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 above-described output control of the molten metal electromagnetic pump 10 is performed based on this information. Is called. 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 to enter. Overflow, flow into the injection sleeve 20 and supplied. When the molten metal liquid level in the hot water supply side duct 1 ′ detected by the molten metal liquid 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. The level of the molten metal in the hot water supply 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 molten metal supplied to 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 hot water supply amount of the molten metal to the injection sleeve 20.

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 is performed by filling the cavity 31 with molten metal.

  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.

  According to the present invention, the molten metal hot water supply device for the die cast sleeve can be used to fill the injection sleeve of the die cast machine with molten metal such as molten aluminum, so that an aluminum die capable of producing a relatively large amount of a small casting is produced. It can be used in fields such as cast casting.

1 'Molten metal electromagnetic pump hot water supply side duct 10 Molten metal electromagnetic pump 20 Injection sleeve 21 Die-casting machine 27 Gas nozzle 29 Weir 31 Cavity 42 Molten metal supply port of injection sleeve

Claims (4)

In a molten metal hot water supply apparatus for a die cast sleeve for supplying molten metal to the injection sleeve 20 for filling the molten metal for casting into the cavity 31 of the die cast machine 21, a molten metal supply port 42 is provided on the side surface of the injection sleeve 20. The hot water supply side duct 1 ′ of the molten metal electromagnetic pump 10 is connected to the molten metal supply port 42, and the hot metal side duct 1 ′ of the molten metal electromagnetic pump 10 is connected to the molten metal electromagnetic pump 10 from the hot water supply side duct 1 ′. The molten metal hot water supply apparatus for the die-cast sleeve is provided with a weir 29 overflowing the molten metal, and the molten metal is filled into the injection sleeve 20 through the weir 29. The molten metal hot water supply apparatus for a die-cast sleeve according to claim 1, wherein the duct 1 'of the molten metal electromagnetic pump 10 is connected horizontally to a molten metal supply port 42 provided on a side surface of the injection sleeve 20. . 3. A gas nozzle 27 is provided in a duct 1 ′ of the molten metal electromagnetic pump 10 and an inert gas is blown into the duct 1 ′ from the gas nozzle 27. Hot water room. A level meter 19 for detecting the level of the molten metal in the duct 1 ′ is provided in the duct 1 ′ of the molten metal electromagnetic pump 10, and the operation of the molten metal electromagnetic pump 10 is controlled while checking the level of the molten metal in the duct 1 ′. The molten metal hot-water supply apparatus to the die-casting sleeve in any one of Claims 1-3 characterized by the above-mentioned.

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