JP2017192980A - Hot chamber casting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting apparatus which is excellent in durability compared with a conventional one, and further, which can prevent contamination of impurities.SOLUTION: A hot chamber casting apparatus 10 comprises a plunger nozzle 20 through which a hot water passage for injecting a molten metal into a casting mold is formed, and a movable chamber 30 having a chamber 31 in which the plunger nozzle 20 is so inserted as to be movable forward and backward. The movable chamber 30 is located in the state that at least the whole of the chamber 31 is immersed in a molten metal W in a pod 50 while the plunger nozzle 20 side being obliquely upward. The plunger nozzle 30 moved forward and backward in the chamber 31 in association with reciprocation of the movable chamber 30 by a hydraulic cylinder 42, whereby the molten metal is injected into casting molds 61, 62 through a hot water passage 21 of the plunger nozzle 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot chamber casting apparatus for manufacturing a die-cast product such as aluminum.

  There are two types of casting methods for die-cast products manufactured from aluminum alloys: a hot chamber system that performs injection in a relatively high temperature molten metal (molten metal material), and a cold chamber that performs injection while supplying molten metal into the sleeve. Broadly divided into methods. Among these, the hot chamber method has advantages such as being capable of thin molding by low-pressure injection, casting of pure aluminum having a relatively high melting point, for example, and a wide selection range of cast metal materials.

  As a conventional hot chamber type aluminum die-casting apparatus, for example, a vertical injection chamber is generally used as shown in FIG. 6 (see, for example, Patent Documents 1 and 2). This type of vertical chamber has a configuration in which the plunger 92 slides up and down in the main cylinder 91 to supply molten aluminum stored in the pod 93 to the branch cylinder 94 and supply molten aluminum to the mold 95. It is.

JP 2010-058131 A JP 2011-110666 A

  However, in the conventional vertical chamber, there is a portion (for example, a runner 96 shown in FIG. 6) where a runner called a gooseneck is bent at an acute angle between the main tube and the branch tube. Therefore, at the time of maintenance of the apparatus, it is necessary to sufficiently drain the molten metal remaining in the hot water passage including the gooseneck. In addition, oxide floating on the surface of the molten aluminum may adhere to the sliding parts of the main cylinder and plunger, which may cause a decrease in the service life such as contamination of the injected metal material and damage to the chamber equipment. ing.

  The present invention has been made in view of such conventional problems, and provides a hot chamber casting apparatus that is superior in durability and that can prevent impurities from being mixed into an injection metal material. The purpose is to do.

  In order to solve the above-described problems, a hot chamber casting apparatus of the present invention has a plunger nozzle in which a hot water passage for injecting a molten metal material into a mold is formed, and a chamber chamber into which the plunger nozzle is inserted. A movable chamber that reciprocates the plunger nozzle so as to advance and retreat in the chamber chamber, thereby introducing the molten metal into the chamber chamber and injecting the molten metal through the molten water passage of the plunger nozzle, and the movable chamber includes: The plunger nozzle side is obliquely upward, and at least the entire chamber chamber is installed in a state of being immersed in the molten metal.

  According to the hot chamber casting apparatus having this configuration, the main injection structure can be simplified, and damage such as galling in the movable part can be reduced to increase durability. In addition, since the injection hot water passage is arranged obliquely, casting at a low pressure becomes possible. Furthermore, since the entire chamber chamber is installed in a state of being immersed in the molten metal, it is possible to prevent impurities such as oxides floating on the surface of the molten metal from being mixed.

  Moreover, the said structure WHEREIN: It is preferable that the junction part in which the said plunger nozzle is installed in the said pod exists above the level of the said molten metal.

  According to this configuration, in order to prevent the molten metal from leaking from the joint portion between the plunger nozzle and the pod, it is not necessary to seal with a conventional ceramic ring or the like, and the apparatus can be simplified.

  Moreover, in the said structure, it is preferable that the flow line in which the said movable chamber reciprocates and the longitudinal direction axis | shaft of the said plunger nozzle correspond.

  According to this configuration, the main injection structure is simplified, mechanical damage such as galling is reduced, and durability can be increased. Further, the plunger nozzle and the movable chamber can be easily separated, and the maintainability can be improved.

  Moreover, in the said structure, it is preferable that the said plunger nozzle and a movable chamber are separable within the said molten metal, and these are installed so that removal from the said pod is possible.

  According to this configuration, since the plunger nozzle and the movable chamber can be separated from the molten metal, the chamber chamber and the plunger nozzle can be sufficiently drained. Therefore, maintainability can be improved.

  According to the hot chamber casting apparatus of the present invention, the main injection structure is simplified and casting at a low pressure is possible. As a result, the durability of the apparatus can be increased and the life can be extended as compared with the prior art. Further, since the chamber is immersed in the molten metal, the oxide on the surface of the molten metal does not enter the chamber, and contamination of the injected metal material can be prevented.

It is a side view of the hot chamber casting apparatus by one Embodiment of this invention. It is sectional drawing which shows the principal part of the injection structure of a hot chamber casting apparatus. It is a figure which shows the example which removes a hot chamber casting apparatus from a pod. It is a figure for demonstrating the operation | movement by a hot chamber casting apparatus. It is a figure for demonstrating the operation | movement by a hot chamber casting apparatus further. It is a figure for demonstrating the vertical casting apparatus by a prior art.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a hot chamber casting apparatus according to the invention will be described with reference to the drawings. FIG. 1 is a side view showing a configuration of a hot chamber casting apparatus 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the main part of the injection structure of the hot chamber casting apparatus 10 shown in FIG.

The hot chamber casting apparatus 10 is an apparatus for producing a cast product having a desired shape by pressurizing and injecting a molten metal W such as molten aluminum stored in a pod (molten tank) 50 into a cavity 63 of a mold.
The pod 50 is a heat-resistant tank installed in a molten metal holding furnace (not shown). The pod 50 of the present embodiment can heat and hold the molten metal at a constant temperature of, for example, 700 ° C. or higher. The pod 50 is appropriately supplied with a high-temperature molten metal from a known melting furnace, and the molten metal level is kept constant.

  Examples of the metal material of a cast product manufactured by the hot chamber casting apparatus 10 include aluminum, an aluminum alloy (for example, Al—Si series, Al—Si—Cu series), a copper alloy, a magnesium alloy, and a zinc alloy. In particular, the present hot chamber casting apparatus 10 can prevent impurities from being mixed, and can perform injection molding at high temperature and low pressure. For example, it can be used for casting precision parts made of pure aluminum having high thermal conductivity. Is suitable.

  The hot chamber casting apparatus 10 includes a plunger nozzle 20 that injects molten metal W into molds 61 and 62, and a movable chamber 30 that is provided so as to reciprocate by a driving device 40. The mold of this embodiment is formed by abutting a fixed mold 61 and a movable mold 62 and is attached to a support member 60 that hangs down from the drive device 40.

  The plunger nozzle 20 is made of heat-resistant ceramic and has a substantially cylindrical shape extending straight. A runner 21 is formed through the central axis of the plunger nozzle 20 in the longitudinal direction. The nozzle tip of the plunger nozzle 20 passes through the support member 60 and is in pressure contact with a concave surface portion 61 a communicating with the injection path 61 b of the fixed mold 61. On the other hand, the rear end portion of the plunger nozzle 20 is fitted into a chamber chamber 31 formed in the lower portion of the movable chamber 30.

  The movable chamber 30 is also formed of a heat resistant ceramic. The movable chamber 30 is formed with a chamber chamber 31 into which the rear end portion of the plunger nozzle 20 described above is fitted. The chamber chamber 31 is formed as a circular and straight deep hole having a diameter slightly larger than the diameter of the plunger nozzle 20 so that the plunger nozzle 20 can be inserted and retracted. Further, the movable chamber 30 is formed with a melt introduction hole 32 and a gas vent hole 33 communicating with the chamber chamber 31. The molten metal introduction hole 32 and the gas vent hole 33 are provided for introducing the molten metal W into the chamber chamber 31, draining the hot water, and venting the gas.

  The upper part of the movable chamber 30 is connected to the driving device 40. The driving device 40 includes a hydraulic cylinder 42, brackets 46 and 47, etc. on a base plate 41. Two guide rods 45 are supported by the front and rear brackets 46 and 47 in parallel with each other on the left and right sides of the hydraulic cylinder 42. The two parallel guide rods 45 slidably penetrate the movable chamber 30, and the guiding direction thereof coincides with the depth direction of the chamber chamber 31, that is, the longitudinal direction of the plunger nozzle 20. ing.

  The movable chamber 30 has a rod 43 of a hydraulic cylinder 42 connected to a joint 44 fixed to the front surface thereof. By switching the pressure oil supplied to the hydraulic cylinder 42 and extending and retracting the rod 43, the movable chamber 30 reciprocates while being guided by the guide rod 45. The flow line of the movable chamber 30 guided by the guide rod 45 coincides with the depth direction of the chamber chamber 31 and the longitudinal axis of the plunger nozzle 20 also coincides.

  As described above, the hot chamber casting apparatus 10 is configured such that the rear end portion of the plunger nozzle 20 moves forward and backward in the chamber chamber 31 in conjunction with the reciprocating motion of the movable chamber 30. By simplifying these main injection structures, there is little mechanical failure such as galling of the movable part, durability is increased, and the life of the apparatus can be extended.

  The hydraulic cylinder 42 preferably has a stroke sufficient to separate the plunger nozzle 20 and the movable chamber 30. By doing so, the plunger nozzle 20 and the movable chamber 30 can be separated while being immersed in the molten metal W. Further, as shown in FIG. 3, the plunger nozzle 20 and the movable chamber 30 can be separated from the molten metal W with a crane or the like, so that the chamber chamber 31 and the water passage 21 can be sufficiently drained. It can be carried out.

  In the hot chamber casting apparatus 10, the movable chamber 30 is installed on the support frame 70 by immersing at least the entire chamber chamber 31 in the molten metal W. Thereby, the metal oxide etc. which floats on the surface of the molten metal W during the casting operation are not introduced into the chamber chamber 31, and the contamination of the injected metal material can be prevented.

  In addition, the movable chamber 30 and the plunger nozzle 20 are arranged obliquely so that the flow line along which the movable chamber 30 reciprocates is on the plunger nozzle 20 on the injection side. As a result, the injection hot water channel starting from the chamber chamber 31 is slanted, and casting at a low pressure is possible as compared with the conventional vertical type.

  Further, by arranging the longitudinal axes of the plunger nozzle 20 and the chamber chamber 31 on an oblique straight line, the joint portion where the plunger nozzle 20 is installed on the pod 50 can be set above the level of the molten metal W. Thereby, in order to prevent the molten metal from leaking at the joint portion between the pod 50 and the plunger nozzle 20, it is not necessary to tightly seal with a conventional ceramic ring.

  Further, for example, a simple joint structure in which the cylindrical body of the plunger nozzle 20 is placed in the receiving groove 51 formed at the upper end of the pod 50, and the plunger nozzle 20 is easily removed by lifting the plunger nozzle 20 with a crane during maintenance of the apparatus. (See FIG. 3). Thereby, workability | operativity at the time of maintaining the hot chamber casting apparatus 10 can be improved.

The casting operation by the hot chamber casting apparatus 10 having such a configuration is as follows.
First, in order to introduce the molten metal W into the chamber 31, as shown in FIG. 4, the rod 43 of the hydraulic cylinder 42 is extended to push down the movable chamber 30. At this time, the volume of the chamber chamber 31 is increased and the pressure is reduced, so that the molten metal is introduced into the chamber chamber 31 through a gap between the inner surface of the chamber chamber 31 and the outer surface of the plunger nozzle 20.

  Next, as shown in FIG. 5, the rod 43 of the hydraulic cylinder 42 is retracted and the movable chamber 30 is pulled up. Thereby, the inside of the chamber chamber 31 is pressurized, and the molten metal is injected into the cavity 63 which is a space between the dies 61 and 62 through the hot water passage 21 of the plunger nozzle 20. Then, after the molten metal in the cavity 63 is cooled and solidified, the movable mold 62 is separated from the fixed mold 61 to obtain a cast product having a predetermined shape.

DESCRIPTION OF SYMBOLS 10 Hot chamber casting apparatus 20 Plunger nozzle 21 Runway 30 Movable chamber 31 Chamber chamber 32 Molten introduction hole 33 Degassing hole 40 Drive apparatus 42 Hydraulic cylinder 43 Rod 44 Joint 45 Guide rod 50 Pod (molten tank)
51 receiving groove 60 support member 61 fixed mold 62 movable mold 63 cavity 70 support frame W molten metal

Claims (4)

A plunger nozzle formed with a hot water passage for injecting a molten metal material into a mold;
The chamber has a chamber into which the plunger nozzle is inserted, and the plunger nozzle is reciprocated so as to advance and retreat in the chamber, thereby introducing the molten metal into the chamber chamber and injecting the molten metal through the water passage of the plunger nozzle. A movable chamber,
The hot chamber casting apparatus, wherein the movable chamber is installed with the plunger nozzle side obliquely upward and at least the entire chamber chamber is immersed in the molten metal.   The hot chamber casting apparatus according to claim 1, wherein a joint portion where the plunger nozzle is installed in the pod is above a level of the molten metal.   The hot chamber casting apparatus according to claim 1 or 2, wherein a flow line in which the movable chamber reciprocates coincides with a longitudinal axis of the plunger nozzle. The hot chamber casting apparatus according to any one of claims 1 to 3, wherein the plunger nozzle and the movable chamber are separable in the molten metal and are detachable from the pod.

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