JP2011110566A - Hot chamber type die casting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot chamber type die casting apparatus which can prevent the involvement of air upon casting. <P>SOLUTION: The hot chamber type die casting apparatus 10 is composed of: a pot 14 storing the molten metal 12 of aluminum based metal; a main tubular part 16; an injection plunger 22; and a nozzle 40. In the main tubular part 16, a cylinder 16A and a goose neck 16B are connected at the bottom part side, and the molten metal 12 in the pot 14 is fed from a suction port 20 to the cylinder 16A. A groove 24 is formed at the side face 22A of the injection plunger so as to reach a position exceeding the upper edge of the main tubular part 16 from the bottom part 22B thereof in a state where the injection plunger 22 lies in an injection return position. After the completion of the casting, when the nozzle 40 is separated from a die 50, and the injection plunger 22 returns, even if the air sucked from the tip part 42 of the nozzle is left in the cylinder 16A, the air is exhausted along the groove 24, and the involvement of the air upon the following casting can be prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot chamber die casting apparatus, and more specifically to a hot chamber die casting apparatus for casting aluminum or an aluminum alloy.

  The die casting method for casting aluminum or an aluminum alloy (hereinafter referred to as “aluminum-based metal”) includes a hot chamber type and a cold chamber type. Among these, as a hot chamber type die casting technique, for example, there is a hot chamber type die casting apparatus disclosed in Patent Document 1 below. Such a hot chamber type die casting apparatus generally has a structure as shown in FIG. In the hot chamber die casting apparatus 150 shown in FIGS. 9 (A) to 9 (C), a main cylinder portion 156 comprising a cylinder 156A and a gooseneck 156B is placed inside a pot 152 that holds a molten metal 154 melted with a metal ingot at a constant temperature. The cylinder 156A is supplied with the molten metal 154 in the pot 152 from a suction port 158 provided on the side surface. An injection plunger 160 that can be moved up and down by a drive mechanism (not shown) is provided inside the cylinder 156A, and a nozzle 162 is connected to the gooseneck 156B. The mold 170 includes a fixed mold 172 and a movable mold 174, and a cavity 176 is formed inside. By pressurizing the molten metal in the cylinder 156 </ b> A by the injection plunger 160, the molten metal 154 can be press-fitted into the cavity 176 through the gooseneck 156 </ b> B and the nozzle 162. The molten metal 154 press-fitted into the cavity 176 is taken out of the mold 170 as a molded product after solidifying.

JP 2001-205412 A

  However, the background art described above has the following problems. After completion of casting shown in FIG. 9 (A), when the injection plunger 160 returns as shown in FIG. 9 (B), the tip end portion 164 of the nozzle 162 is separated from the nozzle touch portion 178 of the mold 170 and returned. The air sucked from 164 may pass through the nozzle 162 and the gooseneck 156B and reach the cylinder 156A. Then, as shown in FIG. 9C, there is an inconvenience that air remains in the cylinder 156A until the next cycle, and the air is entrained at the next casting.

  In addition, if the molten metal 154 leaks from the gap between the bottom plugs 157 of the cylinder 156A at the time of injection, there is a disadvantage that a large shrinkage nest is generated without pressure being transmitted to the product portion (cavity 176). Further, when the temperature of the nozzle touch part 178 on the mold 170 side is lowered, the nozzle tip part 164 is solidified, and the molten metal 154 is not supplied to the mold 170 in the next cycle. Conversely, the temperature of the nozzle touch part 178 is If the height is increased, the molten metal 154 may scatter and adhere to the nozzle distal end 164 when the nozzle distal end 164 is separated, and the molten metal 154 may be ejected from this portion during the next cycle. Further, the malfunction due to the oxidation of the molten metal 154 attached to the surface of the injection plunger 160, the influence of flat wear and bending stress due to the deviation between the outer diameter center of the main cylinder 156 and the bore center (that is, the inner diameter center of the cylinder 156A), etc. There are also inconveniences.

  This invention pays attention to the above points, and is providing the hot chamber type die-casting apparatus which casts aluminum or aluminum alloy which can prevent the entrainment of the air at the time of casting well. Other objectives are to prevent the entrainment of air, leakage of molten metal from the cylinder, temperature control of the nozzle touch part, prevention of malfunction due to oxidation of the molten metal on the surface of the injection plunger, center of the outer diameter of the main cylinder part and bore It is an object of the present invention to provide a hot chamber die casting apparatus capable of at least one of reducing the influence of flat wear and bending stress due to misalignment of the center.

  The present invention is a hot chamber type die casting apparatus for casting aluminum or an aluminum alloy, and is installed in a pot where molten metal is stored, and a suction port for sucking the molten metal in the pot is formed on a side surface A main cylinder portion provided with a cylinder and a gooseneck connected to the cylinder and connected on the bottom side; a nozzle for guiding molten metal from the gooseneck to a mold; An injection plunger that pressurizes the molten metal in the cylinder, and an air formed on the injection plunger so as to reach a position exceeding the upper end of the main cylinder portion from the bottom of the injection plunger in a state where the injection plunger is in the injection return position. It is characterized by having an extraction passage.

  One of the main forms is that the air vent passage is a groove formed on a side surface of the injection plunger, or the air vent passage passes through the inside of the injection plunger from the bottom surface of the injection plunger. And a hole penetrating the side surface.

  Another invention is a hot chamber die casting apparatus for casting aluminum or an aluminum alloy, which is installed in a pot where molten metal is stored, and a suction port for sucking the molten metal in the pot is provided on a side surface. A main cylinder portion provided with a formed cylinder, a gooseneck connected to the cylinder and connected on the bottom side, a nozzle for guiding molten metal from the gooseneck to a mold, and a drive means to move the cylinder up and down An injection plunger for pressurizing the molten metal in the cylinder, and the upper end of the main cylinder portion is reached from a position corresponding to a gap between the injection plunger and the molten metal surface in the cylinder in a state where the injection plunger is at the injection return position. An air vent passage formed on the inner peripheral surface of the cylinder is provided up to the position.

  Still another invention is a hot chamber type die casting apparatus for casting aluminum or an aluminum alloy, which is installed in a pot in which molten metal is stored, and a suction port for sucking the molten metal in the pot is a side surface. A main cylinder part provided with a cylinder formed in the cylinder, a gooseneck connected to the cylinder and connected on the bottom side, a nozzle for guiding the molten metal from the gooseneck to the mold, and a vertical movement in the cylinder by driving means An injection plunger for pressurizing the molten metal in the cylinder, and the main cylinder portion from the cylinder inner peripheral surface corresponding to a gap between the injection plunger and the molten metal surface in the cylinder in a state where the injection plunger is in the injection return position. And an air vent passage penetrating to the outer peripheral surface of the. One of the main forms is characterized in that the air vent passage is inclined so that the inner peripheral surface side of the cylinder is low and the outer peripheral surface side of the main cylinder portion is high.

  Still another invention is a hot chamber type die casting apparatus for casting aluminum or an aluminum alloy, which is installed in a pot in which molten metal is stored, and a suction port for sucking the molten metal in the pot is a side surface. A main cylinder part provided with a cylinder formed in the cylinder, a gooseneck connected to the cylinder and connected on the bottom side, a nozzle for guiding the molten metal from the gooseneck to the mold, and a vertical movement in the cylinder by driving means An injection plunger for pressurizing the molten metal in the cylinder, and in a state where the injection plunger is at the injection return position, from the cylinder inner peripheral surface corresponding to the gap between the injection plunger and the molten metal surface in the cylinder to the gooseneck side It is characterized by having a through-air vent passage.

  Still another invention is a hot chamber type die casting apparatus for casting aluminum or an aluminum alloy, which is installed in a pot in which molten metal is stored, and a suction port for sucking the molten metal in the pot is a side surface. A main cylinder part provided with a cylinder formed in the cylinder, a gooseneck connected to the cylinder and connected on the bottom side, a nozzle for guiding the molten metal from the gooseneck to the mold, and a vertical movement in the cylinder by driving means And the gooseneck and the nozzle have an internal volume set so as not to draw air into the cylinder when the injection plunger returns. And

  One of the main forms is characterized in that the injection plunger driving means operates the injection plunger at the injection return position at a low speed to the vicinity of the suction port during casting. According to another aspect, the main cylinder portion is configured by fitting an inner cylinder whose bottom surface is closed and forming the cylinder, and an outer cylinder covering the outer peripheral surface of the inner cylinder. Still another embodiment is characterized in that temperature adjusting means for measuring the temperature of the nozzle touch portion of the mold and adjusting the temperature to a predetermined temperature is provided.

  Still another embodiment includes a pipe provided along the outer peripheral surface of the injection plunger above the main cylinder portion, and a plurality of holes provided in the pipe at substantially equal intervals toward the outer peripheral surface of the injection plunger. And an inert gas supply means for supplying an inert gas to the pipe. Yet another embodiment is characterized in that an outer diameter center of the injection plunger, an outer diameter center of the main cylinder portion, and an inner diameter center of the cylinder coincide with each other. Yet another embodiment is provided in the injection passage of the first check valve, the gooseneck or the nozzle, which is provided at the bottom of the cylinder and can flow only in the cylinder internal direction. A second check valve capable of flowing only in the direction is provided. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the present invention, the cylinder and the gooseneck are connected in series, the main cylinder part installed in the pot in which the molten metal is stored, the nozzle for guiding the molten metal from the gooseneck to the mold, In a hot chamber die casting apparatus for casting aluminum or an aluminum alloy having an injection plunger for pressurizing a molten metal in a cylinder, when the injection plunger is at an injection return position, air for discharging the air sucked into the cylinder The extraction passage is provided in the injection plunger or the main cylinder, or the gooseneck and the internal volume of the nozzle are set so that air is not drawn into the cylinder when the injection plunger returns. The effect that it can prevent is acquired.

It is principal sectional drawing which shows Example 1 of this invention. It is principal sectional drawing which shows Example 2 of this invention. It is a figure which shows Example 3 of this invention, (A) is principal sectional drawing, (B) is sectional drawing which cut | disconnected said (A) along the # A- # A line | wire and looked at the arrow direction. It is a figure which shows the comparative example of the said Example 3, (A) is principal sectional drawing, (B) is sectional drawing which cut | disconnected said (A) along the # B- # B line | wire and looked at the arrow direction. . It is principal sectional drawing which shows Example 4 of this invention. It is principal sectional drawing which shows Example 5 of this invention. It is principal sectional drawing which shows Example 6 of this invention. It is a figure which shows the other Example of this invention. It is principal sectional drawing which shows an example of background art.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a main sectional view showing the structure of this embodiment. The hot chamber die casting apparatus 10 of the present embodiment includes a pot 14 that holds a molten metal 12 of aluminum or an aluminum alloy (hereinafter referred to as “aluminum-based metal”) at a constant temperature, and a main cylinder that is held inside the pot 14. The part 16, the injection plunger 22 and its drive mechanism (not shown), and the nozzle 40 that guides the molten metal 12 to the mold 50 are configured. The main cylinder portion 16 is made of, for example, ceramic, and has a cylinder 16A and a gooseneck 16B, and these cylinders 16A and the gooseneck 16B are connected so as to be connected on the bottom side. A suction port 20 formed substantially horizontally is provided on the side surface of the cylinder 16A, and the molten metal 12 in the pot 14 is supplied from the suction port 20 into the cylinder 16A. The bottom of the cylinder 16A is provided with a plug 18 and the plugs 28 and 30 are also provided on the bottom and side of the gooseneck 16B. A nozzle 40 is connected to the connection port 32 at the upper end of the gooseneck 16B.

  On the other hand, the mold 50 includes a fixed mold 52 and a movable mold 54, and a cavity 56 is formed inside thereof. The fixed mold 52 is provided with a nozzle touch part 58 to which the nozzle tip part 42 is in close contact. The injection plunger 22 is driven by a drive mechanism (not shown) to pressurize the molten metal 12 of the cylinder 16A, so that the molten metal 12 can be pressed into the cavity 56 via the gooseneck 16B and the nozzle 40. The molten metal 12 press-fitted into the cavity 56 is taken out from the mold 50 as a molded product after solidifying.

  In this embodiment, a groove 24 is formed in the side surface 22A of the plunger 22 as an air vent passage. The groove 24 is formed so as to reach a position exceeding the upper end of the main cylinder portion 16 from the injection plunger bottom portion 22B in a state where the injection plunger 22 is at the injection return position. For this reason, after the casting is completed, the nozzle 40 is separated from the mold 50 and when the injection plunger 22 returns, air is sucked from the nozzle tip 42 and remains in the cylinder 16A. Since the air is discharged to the outside, air can be prevented from being caught at the next casting. In this embodiment, the stroke of the injection plunger 22 is set long enough to form the groove 24.

  As described above, according to the first embodiment, in the state where the injection plunger 22 is in the injection return position, the air is supplied to the injection plunger side surface 22A so as to reach the position exceeding the upper end of the main cylinder portion 16 from the injection plunger bottom 22B. Since the groove 24 is provided as a passage for extraction, there is an effect that the air that has entered the cylinder 16A is discharged after the casting is completed, and the entrainment of air at the next casting can be prevented.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a main sectional view of this embodiment. In addition, the same code | symbol shall be used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds (it is the same also about a following example). The present embodiment is also an example in which an air vent passage is provided in the injection plunger 22 as in the first embodiment. As shown in FIG. 2, the hot chamber type die casting apparatus 60 of the present embodiment is connected to the hole 62 formed upward from the bottom 22B of the injection plunger 22 along the axial direction, and to the hole 62. A through hole 64 is provided through the injection plunger 22 in a direction substantially perpendicular to the axial direction. The through hole 64 is formed at a position exceeding the upper end of the main cylinder portion 16 in a state where the injection plunger 22 is at the injection return position. For this reason, the air that has entered the cylinder 16A after the completion of casting can be discharged through the hole 62 and the through hole 64, and air entrainment at the next casting can be prevented.

  Next, Embodiment 3 of the present invention will be described with reference to FIGS. 3A is a main cross-sectional view of the present embodiment, and FIG. 3B is a cross-sectional view taken along the line # A- # A and viewed in the direction of the arrow. FIG. 4A is a main cross-sectional view of a comparative example, and FIG. 4B is a cross-sectional view of (A) cut along the arrow # B- # B line and viewed in the direction of the arrow. The first and second embodiments described above are examples in which the air vent passage is provided on the injection plunger side, but this embodiment is an example in which the air vent passage is provided on the main tube portion 72 side. In the hot chamber die casting apparatus 70 of the present embodiment, the main cylindrical portion 72 penetrates from the inner peripheral surface of the cylinder 16A to the outer peripheral surface of the main cylindrical portion 16, so that the inner peripheral surface side is low and the outer peripheral surface side is high. An inclined through hole 74 is provided.

  The inner peripheral surface side of the through-hole 74 has, for example, the injection return position (retreat limit position) of the injection plunger 22 as the center of the hole, and is located in the gap between the injection plunger bottom 22B and the surface of the molten metal 12 in the cylinder 16A. is doing. Moreover, the height of the through-hole 74 and the inner peripheral surface side of the suction inlet 20 may be the same, and the position in the circumferential direction may be the same as or different from the suction inlet 20. If the air sucked into the cylinder 16A is discharged only from the horizontal suction port 20, the bubble in which the air and the molten aluminum metal are mixed is difficult to discharge because of its viscosity, but the molten aluminum metal Since the mixed bubbles are light and float on the surface of the molten metal, it is possible to discharge by providing the inclined through holes 74 described above.

  Further, in this embodiment, as shown in FIG. 3B, the outer diameter center P1 of the main cylinder portion 72 and the inner diameter P2 of the cylinder 16A and the outer diameter center P2 of the injection plunger 22 coincide. Thus, the thermal expansion due to the molten metal temperature (650 ° C. to 760 ° C.) of the aluminum-based metal is constant regardless of the angle of the inner diameter by matching the inner peripheral surface of the cylinder 16A and the outer diameter core of the main cylinder portion 72. Thus, the friction caused by the sliding of the injection plunger 22 is constant regardless of the angle, and a substantially perfect circle can be maintained. That is, as in the comparative example shown in FIGS. 4A and 4B (the illustrated example is the hot chamber die casting apparatus 10 of the first embodiment), the outer diameter center P1 of the main cylinder portion 16 and the cylinder 16A If the inner peripheral surface and the center P2 of the outer diameter of the injection plunger 22 are shifted, premature hot water leakage due to abrasion will occur, but such a problem can be solved. In addition, the life until re-polishing of the injection plunger 22 and the inner peripheral surface of the cylinder 16A is prolonged, and the amount of polishing is also reduced, so that the repair cost is reduced and the number of life shots of the injection plunger 22 and the cylinder 16A is increased. Cost can be reduced.

  Further, as in the comparative example, in the state where the outer diameter center P1 of the main cylinder portion 16 is shifted from the inner peripheral surface of the cylinder 16A and the outer diameter center P2 of the injection plunger 22, the center P2 of the injection plunger 22 and the main cylinder Since the outer diameter center P1 of the portion 16 is in an offset state, it is estimated that a rotational force acts on the main cylindrical portion 16 as the molten metal is injected, and a bending force is generated in the injection plunger 22 with uneven contact due to thermal expansion. The On the other hand, by making the centers P1 and P2 coincide with each other as in this embodiment, the bending force can be reduced and the bending of the injection plunger 22 can be reduced. At the same time, since the shearing force generated on the inner diameter of the cylinder 16A is reduced, there is an effect that the cracking of the main cylinder portion 72 is also reduced.

  In addition, in the present embodiment, in order to suck the molten metal 12 into the cylinder 16A, a check valve 76 that can flow only in the inner direction of the cylinder 16A is installed at the bottom of the cylinder 16A as a suction port, and the gooseneck 16B Alternatively, a check valve 78 that can flow only in the injection direction is also provided in the injection flow path of the nozzle 40 (in the illustrated example, the check valve 78 is provided in the gooseneck 16B). These check valves 76 and 78 are a mixture of metal powder and ceramic powder, and the surface is covered with SiN. In order to motivate the initial operation of the check valves 76 and 78, an inert gas such as Ar may be injected from the lower part. When the injection plunger 22 after completion of injection returns, the molten metal 12 in the nozzle 40 and the gooseneck 16B has potential energy, and the pipe resistance is small, so the molten metal 12 in the nozzle 40 and the gooseneck 16B is easily Returning to the inside of the cylinder 16A, air simultaneously flows in from the nozzle 40 and the gooseneck 16B. At this time, by installing the check valve 78 that can flow only in the injection direction in the nozzle 40 or the gooseneck 16B, the check valve 76 under the cylinder 16A can be stably operated. Further, by injecting the inert gas for opening the check valves 76 and 78 from the lower part of the valve, the operation of the check valves 76 and 78 is further stabilized, and a good product can be obtained. In this case, the inert gas is quickly discharged from the through hole 74.

  Next, Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a main sectional view of this embodiment. The present embodiment is also an example in which an air vent passage is provided on the main tube side as in the third embodiment. In the hot chamber die casting apparatus 80 of the present embodiment, an air vent groove 82 is provided on the inner peripheral surface of the cylinder 16A. The groove 82 extends from a position corresponding to a gap between the injection plunger 22 and the surface of the molten metal 12 in the cylinder 16A to a position reaching the upper end of the main cylinder portion 16 in a state where the injection plunger 22 is in the injection return position. Is formed. By providing such a groove 82, the air drawn into the cylinder 16A after the completion of casting is discharged along the groove 82, and air entrainment at the next casting can be prevented.

  Next, Embodiment 5 of the present invention will be described with reference to FIG. FIG. 6 is a main sectional view of this embodiment. The present embodiment also has a structure in which an air vent passage is provided on the main cylinder side as in the third and fourth embodiments. The hot chamber type die casting apparatus 90 shown in FIG. 6 is provided with a through hole 92 from the cylinder 16A to the gooseneck 16B. The through-hole 92 extends from the position corresponding to the gap between the surface of the molten metal 12 in the injection plunger 22 and the cylinder 16A to the connection port 32 between the gooseneck 16A and the nozzle 40 in a state where the injection plunger 22 is in the injection return position. It is formed towards. By providing such a through-hole 92, the air drawn into the cylinder 16A after the completion of casting can be discharged to the nozzle 40 side via the gooseneck 16B, thereby preventing the air from being entrained during the next casting.

  Next, Embodiment 6 of the present invention will be described with reference to FIG. FIG. 7 is a main sectional view of this embodiment. In the first to fifth embodiments described above, an air vent passage is provided in either the injection plunger or the main cylinder, but this embodiment is an example in which air entrainment is prevented by setting the internal volume of the gooseneck and nozzle. It is. In the hot chamber die casting apparatus 100 shown in FIG. 7, the inner diameter D1 of the nozzle 40 and the inner diameter D2 of the gooseneck 16B are larger than those of the die casting apparatus 10 of the first embodiment, and the gooseneck 16B and the nozzle 40 are returned when the injection plunger 22 returns. Further, the internal volume is set so as not to draw air into the cylinder 16A. By adopting the structure of the present embodiment, air is not drawn into the cylinder 16A when the injection plunger 22 returns, so that air is not entrained at the next casting.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) In addition to the structure of the first embodiment described above, the hot chamber die casting apparatus 110 shown in FIGS. 8A-1 and 8A-2 changes the injection return position by extending the plunger stroke. This is an example in which the interval I between the injection plunger bottom 22B and the suction port 20 is set large. The plunger stroke is lengthened and the injection plunger 22 at the pouring completion position (position shown in FIG. 8 (A-1)) is operated at a low speed to the vicinity of the suction port 20 as shown in FIG. 8 (A-2). It is good also as a structure which prevents the entrainment of the air at the time of casting by discharging the air inhaled by 16A from the said suction inlet 20. FIG. The same applies to the other Examples 2 to 6.

  (2) In the hot chamber type die casting apparatus 120 shown in FIG. 8 (B), in the first embodiment, the molten metal 12 leaks from the gap between the cylinder plugs 18 of the cylinder 16A, and the pressure is transmitted to the product portion (cavity 56). The main cylinder portion 122 includes an inner cylinder 124A that has a closed bottom surface and forms a cylinder 16A, and an outer cylinder that covers the outer peripheral surface of the inner cylinder 124A. 124B has a fitting structure (tightening fit). By adopting such a configuration, it is not necessary to provide a main plug 122 in the main cylinder portion 122. Therefore, it is possible to prevent leakage and improve the propagation of pressure to the product portion.

  Further, in the hot chamber die casting apparatus 120 shown in FIG. 8B, a thermocouple is used as a temperature adjusting means for measuring the temperature of the nozzle touch portion 58 on the nozzle touch portion 58 of the fixed mold 52 and adjusting the temperature to a predetermined temperature. 126 is provided. When the temperature of the nozzle touch part 58 is low, the nozzle tip part 42 is solidified, and the molten metal is not supplied to the mold 50 during the next cycle. Conversely, when the temperature of the nozzle touch part 58 is high, the nozzle 40 is removed from the mold 50. When separated, the molten metal 12 scatters and adheres to the touch portion, and the molten metal 12 is ejected from this portion during the next cycle. Therefore, it is possible to perform continuous casting by measuring the temperature of the nozzle touch part 58 and controlling it with the thermocouple 126 so as to be 300 to 500 ° C. Of course, such a fitting structure of the thermocouple 126 and the main cylindrical portion 122 may be applied to the second to sixth embodiments.

  (3) FIG. 8C shows a configuration for preventing malfunction due to oxidation of the molten metal 12 adhering to the surface of the injection plunger 22. In addition to the configuration of the die casting apparatus 10 of the first embodiment described above, the hot chamber type die casting apparatus 130 shown in FIG. 8C has a copper tube 132 disposed along the outer peripheral surface of the injection plunger 22 above the main cylinder portion 16. It has a configuration provided. A plurality of holes 134 are formed in the copper tube 132 at substantially equal intervals toward the outer peripheral surface of the injection plunger 22, and a pipe for supplying an inert gas from an inert gas supply source (not shown). 136 is connected. The inert gas 138 covers the outer peripheral surface of the injection plunger 22 by continuously flowing a small amount of inert gas (for example, Ar gas) 138 from the hole 134 toward the injection plunger 22 through the pipe 136 and the copper pipe 132. Then, the surface of the molten metal 12 is covered to prevent oxidation. With such a configuration, the aluminum-based metal melt 12 adhering to the surface of the injection plunger 22 that moves up and down does not oxidize, so that the operation failure of the injection plunger 22 can be prevented. Further, friction between the injection plunger 22 and the cylinder 16A can be reduced. At the same time, since the inert gas 138 covers the surface of the molten metal 12, no oxide film is formed on the surface, so that the quality of the molten metal 12 is stabilized. As the inert gas 138, nitrogen gas may be used in addition to the Ar gas. Of course, you may apply the copper tube 132 mentioned above to Examples 2-6.

(4) The shapes and dimensions shown in the above-described embodiments are examples, and may be appropriately changed as necessary.
(5) In the example shown in FIG. 8B, the thermocouple 126 is provided on the mold 50 side, but a heater may also be provided on the nozzle 40 side.
(6) In the third embodiment, the outer diameter center P1 of the main cylinder portion 70 and the inner circumference of the cylinder 16A and the outer diameter center P2 of the injection plunger 22 are made to coincide with each other. , 4-6, the centers 1 and 2 may be made to coincide.
(7) The example in which the air vent passage is provided in the main cylinder portion (examples of FIGS. 3, 5, and 6) can be applied to the case where the injection plunger 22 is a ring type.

  According to the present invention, the cylinder and the gooseneck are connected in series, the main cylinder part installed in the pot in which the molten metal is stored, the nozzle for guiding the molten metal from the gooseneck to the mold, An injection plunger that pressurizes the molten metal in the cylinder, and when the injection plunger is at the injection return position, an air vent passage for discharging the air sucked into the cylinder is provided in the injection plunger or the main cylinder portion, or Since the internal volume of the gooseneck and nozzle is set so that air is not drawn into the cylinder when the injection plunger returns, the entrainment of air during casting is prevented, so a molten aluminum or aluminum alloy is cast. Applicable to hot chamber die casting equipment.

10: Hot chamber type die-casting device 12: Molten metal 14: Pot 16: Main cylinder part 16A: Cylinder 16B: Gooseneck 18: Mechlet plug 20: Suction port 22: Injection plunger 22A: Side 22B: Bottom part 24: Groove 28, 30: Mekula Plug 32: Connection port 40: Nozzle 42: Tip part 50: Mold 52: Fixed mold 54: Movable mold 56: Cavity 58: Nozzle touch part 60, 70, 80, 90, 100, 110, 120, 130: Hot chamber Type Die Casting Device 62: Hole 64: Through Hole 72: Main Tube 74: Through Hole 76, 78: Check Valve 82: Groove 92: Through Hole 122: Main Tube 124A: Inner Tube 124B: Outer Tube 126: Thermocouple 132: Copper pipe 134: Hole 136: Pipe 138: Inert gas 150: Hot chamber type die casting apparatus 152: Pot 154: Melting Hot water 156: Main tube portion 156A: Cylinder 156B: Gooseneck 157: Mekula plug 158: Suction port 160: Injection plunger 162: Nozzle 164: Tip portion 170: Mold 172: Fixed die 174: Movable die 176: Cavity 178: Nozzle touch Part D1, D2: Inner diameter I: Interval P1, P2: Center

Claims (14)

A hot chamber die casting apparatus for casting aluminum or an aluminum alloy,
A cylinder is provided in the pot where the molten metal is stored, and a cylinder having a suction port formed on a side surface for sucking the molten metal in the pot and a gooseneck connected to the cylinder and connected on the bottom side are provided. Main cylinder,
A nozzle for guiding the molten metal from the gooseneck to the mold,
An injection plunger that moves up and down in the cylinder by a driving means and pressurizes the molten metal in the cylinder;
An air vent passage formed in the injection plunger so as to reach a position exceeding the upper end of the main cylinder portion from the bottom of the injection plunger in a state where the injection plunger is in the injection return position;
A hot chamber type die casting apparatus comprising:   2. The hot chamber die casting apparatus according to claim 1, wherein the air vent passage is a groove formed on a side surface of the injection plunger.   2. The hot chamber die casting apparatus according to claim 1, wherein the air vent passage is a hole that passes from the bottom surface of the injection plunger through the inside of the injection plunger and penetrates the side surface. A hot chamber die casting apparatus for casting aluminum or an aluminum alloy,
A cylinder is provided in the pot where the molten metal is stored, and a cylinder having a suction port formed on a side surface for sucking the molten metal in the pot, and a gooseneck connected to the cylinder and connected on the bottom side are provided. Main tube section,
A nozzle for guiding the molten metal from the gooseneck to the mold,
An injection plunger that moves up and down in the cylinder by a driving means and pressurizes the molten metal in the cylinder;
In the state where the injection plunger is in the injection return position, it is formed on the inner peripheral surface of the cylinder from a position corresponding to a gap between the injection plunger and the molten metal surface in the cylinder to a position reaching the upper end of the main cylinder portion. Air vent passage,
A hot chamber type die casting apparatus comprising: A hot chamber die casting apparatus for casting aluminum or an aluminum alloy,
A cylinder is provided in the pot where the molten metal is stored, and a cylinder having a suction port formed on a side surface for sucking the molten metal in the pot, and a gooseneck connected to the cylinder and connected on the bottom side are provided. Main tube section,
A nozzle for guiding the molten metal from the gooseneck to the mold,
An injection plunger that moves up and down in the cylinder by a driving means and pressurizes the molten metal in the cylinder;
An air vent passage penetrating from the inner peripheral surface of the cylinder corresponding to the gap between the injection plunger and the molten metal surface in the cylinder to the outer peripheral surface of the main cylindrical portion in a state where the injection plunger is in the injection return position;
A hot chamber type die casting apparatus comprising:   6. The hot chamber die casting apparatus according to claim 5, wherein the air vent passage is inclined so that the inner peripheral surface side of the cylinder is low and the outer peripheral surface side of the main cylinder portion is high. A hot chamber die casting apparatus for casting aluminum or an aluminum alloy,
A cylinder is provided in the pot where the molten metal is stored, and a cylinder having a suction port formed on a side surface for sucking the molten metal in the pot, and a gooseneck connected to the cylinder and connected on the bottom side are provided. Main tube section,
A nozzle for guiding the molten metal from the gooseneck to the mold,
An injection plunger that moves up and down in the cylinder by a driving means and pressurizes the molten metal in the cylinder;
An air vent passage penetrating from the cylinder inner peripheral surface corresponding to the gap between the injection plunger and the molten metal surface in the cylinder to the gooseneck side in a state where the injection plunger is at the injection return position;
A hot chamber type die casting apparatus comprising: A hot chamber die casting apparatus for casting aluminum or an aluminum alloy,
A cylinder is provided in the pot where the molten metal is stored, and a cylinder having a suction port formed on a side surface for sucking the molten metal in the pot, and a gooseneck connected to the cylinder and connected on the bottom side are provided. Main tube section,
A nozzle for guiding the molten metal from the gooseneck to the mold,
An injection plunger that moves up and down in the cylinder by a driving means and pressurizes the molten metal in the cylinder;
With
The hot chamber die casting apparatus according to claim 1, wherein the gooseneck and the nozzle have an internal volume set so as not to draw air into the cylinder when the injection plunger returns.   The hot chamber type die casting according to any one of claims 1 to 8, wherein the injection plunger drive means operates the injection plunger at the injection return position at a low speed to the vicinity of the suction port during casting. apparatus.   The main cylinder portion is configured by fitting an inner cylinder whose bottom surface is closed to form the cylinder and an outer cylinder that covers an outer peripheral surface of the inner cylinder. The hot chamber type die casting apparatus according to the item. Temperature adjusting means for measuring the temperature of the nozzle touch part of the mold and adjusting the temperature to a predetermined temperature;
The hot chamber die casting apparatus according to claim 1, wherein the hot chamber die casting apparatus is provided. A pipe provided along the outer peripheral surface of the injection plunger above the main cylinder portion,
A plurality of holes provided at substantially equal intervals in the pipe toward the outer peripheral surface of the injection plunger,
An inert gas supply means for supplying an inert gas to the pipe;
The hot chamber die casting apparatus according to claim 1, wherein the hot chamber die casting apparatus is provided.   The hot chamber die casting apparatus according to any one of claims 1 to 12, wherein an outer diameter center of the injection plunger, an outer diameter center of the main cylinder portion, and an inner diameter center of the cylinder coincide with each other. A first check valve provided at the bottom of the cylinder and capable of flowing only in the cylinder internal direction;
A second check valve which is provided in the injection flow path of the gooseneck or nozzle and which can flow only in the injection direction of the molten metal;
The hot chamber type die casting apparatus according to any one of claims 1 to 13, wherein the hot chamber type die casting apparatus is provided.

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