JP2005034867A - Die casting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die casting device which inexpensively and efficiently cools a sleeve without causing the degradation of rigidity. <P>SOLUTION: The die casting device 10 is provided with a die casting die 32 constituting a cavity 30, an injection device 36, and a cooling device 38 having a cooling liquid path. The cooling device 38 is mounted freely attachably/detachably to/from the outer face of the sleeve 50. A water-feeding pipe is connected to a joint on the upstream side which constitutes the cooling device 38. A drainage pipe is connected to a joint on the downstream side. The cooling liquid, which is given to the cooling liquid path from the water-feeding pipe, is discharged from the drainage pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die casting apparatus including a cooling mechanism for cooling an injection sleeve to which a molten metal is supplied.
[0002]
[Prior art]
Referring to FIG. 12, a sleeve 2 of a general die casting apparatus 1 is provided with a pouring port 3, and at the time of injection molding, molten metal in a ladle of the hot water supply device is poured into the sleeve 2 through the pouring port 3. The molten metal is pumped into the cavity 6 of the die casting mold 5 by the injection plunger 4. Therefore, in the sleeve 2, the hot molten metal first hits a portion (hereinafter referred to as “hot water receiving portion”) 7 facing the pouring port 3, and there is a problem that the hot water receiving portion 7 is easily damaged by heat. It was.
[0003]
Therefore, conventionally, a groove is directly formed in the sleeve, a cooling liquid path is formed by the groove and the cover cylinder, and the hot water receiving portion is cooled by the cooling liquid flowing through the cooling liquid path (see Patent Document 1). ).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 1-2660 Publication
[Problems to be solved by the invention]
In the prior art, since the groove is directly formed in the sleeve, there is a problem that the thickness of the sleeve is reduced at the portion where the groove is formed, the rigidity is lowered, and deformation is likely to occur. And when a sleeve deform | transformed, there existed a problem that the slidability of the injection plunger inserted in the sleeve was impaired. Further, since a special sleeve having a groove is required, the conventional sleeve cannot be used as it is, and there is a problem that the cost is high.
[0006]
Therefore, a main object of the present invention is to provide a die casting apparatus that can cool a sleeve efficiently at a low cost without causing a decrease in rigidity.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, “the die casting mold 32 constituting the cavity 30, the sleeve 50 provided with the pouring port 48, and the molten metal 12 supplied from the pouring port 48 into the sleeve 50 are pumped into the cavity 30. The die casting apparatus 10 ”includes the injection device 36 having the injection plunger 52 and the cooling device 38 having the cooling liquid path 72 through which the cooling liquid flows and detachably attached to the outer surface of the sleeve 50.
[0008]
In the present invention, since the liquid cooling type cooling devices 38 and 102 having the cooling liquid passage 72 are detachably mounted on the outer surface of the sleeve 50, it is not necessary to form a groove in the sleeve 50. Therefore, there is no concern that the rigidity of the sleeve 50 is impaired. Further, since the general sleeve 50 can be used as it is, the cost can be reduced.
[0009]
The invention described in claim 2 is characterized in that, in the invention described in claim 1, "the cooling device 102 has a plurality of heat radiation fins 106, 108".
[0010]
In the present invention, the sleeve 50 can be efficiently cooled by the cooling liquid passage 72 and the radiation fins 106 and 108.
[0011]
According to the third aspect of the present invention, “the die casting mold 32 constituting the cavity 30, the sleeve 50 provided with the pouring port 48, and the molten metal 12 supplied from the pouring port 48 into the sleeve 50 are pumped into the cavity 30. Die-casting device comprising an injection device 36 having an injection plunger 52 and a plurality of radiating fins 90, 100, 106, 108, and cooling devices 82, 84, 102 detachably mounted on the outer surface of the sleeve 50. 10 ".
[0012]
In the present invention, since the air-cooling type cooling devices 82, 84, 102 having the radiation fins 90, 100, 106, 108 are detachably mounted on the outer surface of the sleeve 50, it is necessary to form a groove in the sleeve 50. There is no. Therefore, similarly to the first and second aspects of the invention, the rigidity of the sleeve 50 can be prevented from being impaired, and the cost can be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a die casting apparatus 10 to which the present invention is applied includes a hand-operated furnace 14 for storing a molten metal 12 (such as aluminum), a die-casting machine 16 for forming a product from the molten metal 12, and a hand-operated furnace 14 And a hot water supply device 18 for supplying the molten metal to the die casting machine 16.
[0014]
The hot water supply device 18 includes a support column 20, and a transfer arm 22 that moves back and forth between the hand-held furnace 14 and the die casting machine 16 is rotatably attached to the support column 20. A hot water supply arm 24 is rotatably attached to the distal end portion of the transfer arm 22, and a ladle 26 is rotatably attached to the distal end portion of the hot water supply arm 24. Then, two motors 28 for individually driving the transfer arm 22, the hot water supply arm 24 and the ladle 26 are attached to the support column 20.
[0015]
When the molten metal 12 is pumped up using the hot water supply device 18, as shown by a two-dot chain line in FIG. 1, the transport arm 22 is rotated toward the hand-held furnace 14, and the ladle 26 is raised with the hot water supply arm 24 standing up. It is put in the molten metal 12 in the hand-held furnace 14. Then, when the transfer arm 22 is rotated, the hot water supply arm 24 and the ladle 26 are pulled up from the hand-held furnace 14, and then the transfer arm 22 is rotated in the opposite direction, whereby the hot water supply arm 24 and the ladle 26 are It is moved toward the die casting machine 16.
[0016]
The die casting machine 16 includes a die casting mold 32 constituting the cavity 30, an opening / closing device 34 for opening and closing the die casting mold 32, and an injection device 36 for injecting the molten metal 12 toward the cavity 30 (FIG. 1, FIG. 1). 2) and the cooling device 38 (FIGS. 2 to 5).
[0017]
As shown in FIG. 1, the opening / closing device 34 includes a fixed plate 40, a support plate (not shown) disposed opposite to the fixed plate 40, and a tie bar 42 installed between the fixed plate 40 and the support plate. A movable plate 44 having a hole through which the tie bar 42 is inserted is movably disposed between the fixed plate 40 and the support plate. The support plate is provided with a drive device (not shown) for driving the movable plate 44. A fixed mold 32 a constituting the die casting mold 32 is attached to the fixed plate 40, and a movable mold 32 b constituting the die casting mold 32 is attached to the movable plate 44.
[0018]
As shown in FIG. 2, the injection device 36 injects the molten metal 12 supplied from the hot water supply device 18 into the cavity 30, and has a cylindrical sleeve 50 provided with a pouring port 48 at the upper portion thereof, and the sleeve 50. The injection plunger 52 is slidably inserted into the inside of the main body, and a drive device (not shown) for driving the injection plunger 52 to reciprocate. The sleeve 50 is attached to the fixed plate 40 of the opening / closing device 34, and the sleeve 50 and the cavity 30 are communicated with each other via the molten metal passage 54.
[0019]
When the molten metal 12 is injected into the cavity 30 using the injection device 36, first, the injection plunger 52 is held back (FIG. 2), and the sleeve 50 of the sleeve 50 is passed through the pouring port 48 from the ladle 26 of the hot water supply device 18. Pour molten metal 12 into the interior. Subsequently, the molten plunger 12 in the sleeve 50 is pumped toward the cavity 30 by advancing the injection plunger 52. Accordingly, in the sleeve 50, the hot molten metal 12 first hits the hot water receiving portion 56 facing the pouring port 48, and the hot water receiving portion 56 is heated to a high temperature by the molten metal 12.
[0020]
The cooling device 38 is for preventing the hot water receiving portion 56 from being heated to the molten metal 12 and becoming overheated, and as shown in FIGS. 3 to 5, a substantially cylindrical main body portion 58 and a main body It is constituted by three joints 60 for connecting a water supply pipe or a drain pipe to the portion 58.
[0021]
As shown in FIGS. 3 to 6, the main body portion 58 includes an inner wall portion 62 and an outer wall portion 64. The inner wall portion 62 includes a cooling section 66 having a substantially C-shaped cross section having an inner surface that is in close contact with the outer surface of the sleeve 50, and the cross section having an inner surface along the outer surface of the sleeve 50 at one end in the axial direction of the cooling section 66. A C-shaped fixing part 68 is formed integrally with the cooling part 66. And the space part pinched | interposed into the circumferential direction both ends of the cooling part 66 becomes the opening part 70 corresponding to the pouring port 48 of the sleeve 50 positionally. Further, as shown in FIG. 5, a concave portion 74 constituting the cooling liquid path 72 is formed on the outer surface of the cooling portion 66, and a screw hole 78 into which the fixing screw 76 is screwed is formed in the fixing portion 68. The
[0022]
The outer wall portion 64 is a member having a substantially C-shaped cross section that constitutes the cooling liquid passage 72 in cooperation with the inner wall portion 62, and the outer wall portion 64 has three screw holes 80 a to 80 c communicating with the cooling liquid passage 72. Thus, the outer surface of the inner wall portion 62 and the inner surface of the outer wall portion 64 are firmly joined by welding or the like. And the coupling 60 is joined with respect to the screw holes 80a-80c.
[0023]
As shown in FIG. 5, the cooling liquid path 72 includes a curved cooling path 72 a that covers the hot water receiving part 56 of the sleeve 50, and a linear liquid supply path 72 b that communicates with the central portion in the circumferential direction of the cooling path 72 a. The screw hole 80a is formed in the upstream part of the liquid supply path 72b, and the screw holes 80b and 80c are formed in the circumferential direction both ends of the cooling path 72a. In addition, the shape of the cooling path 72a is not limited to a curved surface shape, and may be, for example, a linear shape or a shape in which a line and a surface are mixed.
[0024]
In addition, the material of the inner wall part 62 and the outer wall part 64 is not particularly limited, but it is desirable to use a metal material (aluminum bronze or the like) excellent in thermal conductivity in that a high heat dissipation effect can be obtained.
[0025]
As shown in FIG. 3, the joint 60 is for connecting a water supply pipe or a drain pipe to the screw holes 80 a to 80 c, and a male screw portion 60 a is formed at one end of the joint 60 and at the other end. The insertion opening 60b is formed. Then, the male screw portion 60a is screwed into any of the screw holes 80a to 80c, and the insertion port 60b is inserted into and connected to the end portion of the water supply pipe or the drain pipe.
[0026]
When the cooling device 38 is mounted on the outer surface of the sleeve 50, the main body portion 58 of the cooling device 38 is put on the outer surface from the end portion of the sleeve 50, and the cooling device 38 is positioned on the outer surface of the sleeve 50. Subsequently, the fixing screw 76 attached to the fixing portion 68 is screwed in, and the tip of the fixing screw 76 is pressed against the outer surface of the sleeve 50, thereby preventing the displacement of the cooling device 38. Thereafter, a water supply pipe or a drain pipe is connected to each joint 60 of the cooling device 38.
[0027]
When the cooling liquid is supplied from the water supply pipe to the cooling liquid path 72 through the joint 60 on the upstream side, this cooling liquid is supplied to the cooling path 72a through the liquid supply path 72b. The hot water part 56) is cooled. Then, the coolant heated by heat exchange with the sleeve 50 is discharged from the drain pipe through the joint 60 on the downstream side.
[0028]
According to this embodiment, since the cooling device 38 having the cooling liquid path 72 is detachably attached to the outer surface of the sleeve 50, it is necessary to directly form a groove for forming the cooling liquid path in the sleeve 50. There is no. Therefore, the rigidity of the sleeve 50 is not impaired. Further, since the cooling device 38 can be detachably attached to the outer surface of the general sleeve 50, it is not necessary to use a special sleeve, and the cost can be reduced. That is, when replacing the sleeve 50 that has reached the end of its life, the cooling device 38 can be removed once and only the sleeve 50 can be replaced, so that one cooling device 38 can be used continuously.
[0029]
In the above-described embodiment, the liquid cooling type cooling device 38 is detachably attached to the outer surface of the sleeve 50, but instead of this, air cooling type cooling as shown in FIG. 7 or FIG. The device 82 or 84 may be detachably mounted on the outer surface of the sleeve 50, and cool air may be applied to them from a fan or the like.
[0030]
As shown in FIG. 7, the cooling device 82 includes a substantially C-shaped cooling section 86 having an inner surface along the outer surface of the sleeve 50, and a substantially C-shaped fixing section 88 having an inner surface along the outer surface of the sleeve 50. In addition, a plurality of radiating fins 90 extending in the axial direction are integrally provided radially on the outer surface of the cooling portion 86, and a screw hole 92 into which a fixing screw is screwed is formed in the fixing portion 88. Then, cold air is applied to the heat radiation fin 90 from a fan or the like. According to this embodiment, the sleeve 50 can be cooled and the sleeve 50 can be reinforced by the radiation fins 90.
[0031]
As shown in FIG. 8, the cooling device 84 includes a substantially C-shaped cooling section 94 having an inner surface along the outer surface of the sleeve 50, and a fixing section 96 having a substantially C-shaped section having an inner surface along the outer surface of the sleeve 50. In addition, a plurality of radiating fins 100 extending in the circumferential direction are integrally provided on the outer surface of the cooling portion 94 at intervals in the axial direction, and a screw hole 98 into which a fixing screw is screwed into the fixing portion 96. Is formed. Then, cool air is given to the heat radiating fins 100 from a fan or the like. According to this embodiment, since the cool air given from the side by a fan or the like flows in the circumferential direction between the radiation fins 100, the heat radiation effect of the radiation fins 100 can be enhanced.
[0032]
Further, a cooling device 102 adopting both liquid cooling and air cooling as shown in FIG. 9 is detachably mounted on the outer surface of the sleeve 50, and the sleeve 50 is cooled by giving cooling liquid and cold air to the cooling device 102. Also good. As the main body 104 of the cooling device 102, as shown in FIG. 10, a structure having a plurality of heat radiation fins 106 extending in the axial direction with respect to the main body 58 (FIG. 6) of the cooling device 38, 11, a structure having a plurality of heat radiation fins 108 extending in the circumferential direction with respect to the main body 58 (FIG. 6) of the cooling device 38 can be used. 10 and 11, the same reference numerals are given to the same parts as the main body 58 (FIG. 6).
[0033]
【The invention's effect】
In the invention described in claims 1 and 2, a cooling device having a cooling liquid path is detachably mounted on the outer surface of the sleeve. In the invention described in claims 2 and 3, the radiating fin is mounted on the outer surface of the sleeve. Since the cooling device having the above is detachably mounted, it is not necessary to form a groove in the sleeve. Therefore, there is no fear that the rigidity of the sleeve is impaired. In addition, since the cooling device can be detachably attached to a general sleeve, it is not necessary to use a special sleeve having a cooling function, and the cost can be greatly reduced.
[0034]
According to the invention described in claim 2, since the cooling device having the cooling liquid passage and the heat radiation fin is used, the sleeve can be efficiently cooled by both the liquid cooling and the air cooling.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a die casting apparatus to which the present invention is applied.
FIG. 2 is a cross-sectional view showing an injection device and a cooling device.
FIG. 3 is a front view showing a cooling device.
FIG. 4 is a side view showing a cooling device.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a perspective view showing a main body of the cooling device.
FIG. 7 is a perspective view showing another cooling device.
FIG. 8 is a perspective view showing another cooling device.
FIG. 9 is a front view showing another cooling device.
10 is a perspective view showing a main body portion of the cooling device shown in FIG. 9. FIG.
11 is a perspective view showing another main body portion of the cooling device shown in FIG. 9;
FIG. 12 is a cross-sectional view showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Die-casting device 14 ... Hand-held furnace 16 ... Die-casting machine 18 ... Hot-water supply device 36 ... Injection device 38, 82, 84, 102 ... Cooling device 48 ... Pouring port 50 ... Sleeve 56 ... Hot-water receiving part 90,100,106,108 ... Heat dissipation fin

Claims (3)

Die-casting molds that make up the cavity,
An injection device having a sleeve provided with a pouring spout, an injection plunger for pumping the molten metal supplied from the pouring spout into the sleeve, and a cooling fluid passage through which a coolant flows, the sleeve A die casting apparatus comprising a cooling device detachably mounted on the outer surface of the apparatus. The die-casting device according to claim 1, wherein the cooling device has a plurality of heat radiation fins. Die-casting molds that make up the cavity,
An injection device having a sleeve provided with a pouring spout, an injection plunger that pumps the molten metal supplied from the pouring spout into the sleeve, and a plurality of heat dissipating fins, on the outer surface of the sleeve A die casting apparatus including a cooling device that is detachably mounted.

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