JP2008114280A - Structure for preventing spouting of molten metal in metallic die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for preventing the spouting of molten metal in a metallic die, which structure can prevent the spouting of molten metal, and further can prevent the clogging of a vacuum valve or can set the gap of a chill vent wide. <P>SOLUTION: In the metallic die 10 comprising a degassing means 3 composed of a vacuum valve 32 in a degassing passage 200 in order to release the gas existing in the cavity 100 of the metallic die 10, the structure for preventing the spouting of molten metal in the metallic die 10 through the degassing means 3 is arranged in the degassing passage 200 on the cavity 100 side with respect to the degassing means 3, and comprises a block 4 composing part of the degassing passage 200 as a zigzag passage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water spray preventing structure for preventing molten metal from pouring out of a mold through a gas vent passage during pouring.

As a degassing means for a mold, for example, the structure shown in FIGS. 21 and 22 is known. In the structure shown in FIG. 21, a chill vent 31 is provided in a gas vent passage 200 that leads from a cavity 100 to a vacuum suction device (not shown) outside the mold 10 (see FIG. 3 of Patent Document 1). Further, in the structure shown in FIG. 22, a vacuum valve 32 is provided in the gas vent passage 200.
JP 2000-225453 A

  By the way, in pressure die casting, since the molten metal such as aluminum alloy is filled into the cavity 100 at high speed, the molten metal passes through the gas vent passage 200 and is not stopped by the chill vent 31 or the vacuum valve 32, so There was a case of erupting outside. That is, “hot water blowing” may occur.

  In addition, a molten metal cast piece remains in the vacuum valve 32, which may cause clogging of the vacuum valve 32 and hinder vacuum suction.

  Further, in the chill vent 31, in order not to allow the molten metal to pass therethrough, the gap 311 between the jagged irregularities facing each other is normally set to 1 mm or less. For this reason, the molten metal piece solidified in the gap is thin and breaks when the molded product is pushed out from the mold 10, which hinders the subsequent process.

  An object of the present invention is to provide a mold hot-water spray preventing structure that can prevent hot-water spray, and further can prevent clogging of a vacuum valve or set a wide gap between chill vents.

  According to the present invention, in a mold provided with a gas venting means constituted by a vacuum valve or a chill vent for venting a gas in a cavity of a mold in a gas vent passage, molten metal is ejected beyond the gas venting means. A structure for preventing hot water spraying, which is provided on the cavity side of the gas vent passage from the gas vent means and has a passage structure in which a part of the gas vent passage is configured as a meandering passage. It is characterized by having.

  As said channel | path structure, the following structure (a) or (b) is employable, for example.

(A) The passage structure is composed of a block having a meandering passage, the block is configured by combining two block pieces, and unevenness is formed on the mating surfaces of the two block pieces, respectively. The concave portion and the convex portion are formed so as to face each other, and the block constitutes a meandering passage by the unevenness of the mating surface of the two block pieces.

(B) The passage structure is constituted by a part of the degassing passage itself, and both opposing walls of the degassing passage itself are formed in an uneven shape, and a concave portion and a convex portion are formed between each other. By being formed to face each other, a meandering passage is configured.

  According to the present invention, the speed of the molten metal flowing into the gas vent passage can be extremely reduced by the meandering passage. Accordingly, the molten metal flowing into the gas vent passage can be stopped almost certainly before the gas vent means. Therefore, when pouring the molten metal into the cavity, it is possible to prevent the molten metal from being ejected out of the mold through the gas vent passage. That is, hot water spray can be prevented.

  Furthermore, since the molten metal can be stopped almost certainly before the degassing means, for example, the chill vent, it is not necessary to reduce the gap between the jagged irregularities facing the chill vent in order to stop the molten metal. That is, the gap can be set wide. Therefore, even if the molten metal flows into the chill vent and solidifies in the gap, the solidified molten metal becomes thick, so it is difficult to break when extruding the molded product from the mold, and it breaks and interferes with the subsequent process. There is no.

  Alternatively, since the molten metal can be stopped almost certainly before the degassing means, for example, the vacuum valve, the molten metal cast piece does not remain in the vacuum valve. Therefore, clogging of the vacuum valve can be prevented and vacuum suction can be performed satisfactorily.

  According to the configuration (a), it is possible to configure a meandering passage that is replaceable with respect to the mold and has any form. Therefore, it is possible to easily realize an optimum passage structure for preventing hot water spray.

  According to the said structure (b), a meandering channel | path can be comprised with an easy operation | work with respect to a metal mold | die. Therefore, the passage structure can be realized with good workability.

[First Embodiment]
FIG. 1 is a longitudinal cross-sectional view showing an example of a die casting mold that employs the hot water spray preventing structure of the present invention. The mold 10 includes a movable mold 1 and a fixed mold 2. The fixed mold 2 is provided with an injection portion 9 composed of a sleeve 91 and a plunger 92. The mold 10 forms a cavity 100 by combining the movable mold 1 and the fixed mold 2, and further configures a gas vent passage 200. The gas vent passage 200 communicates from the cavity 100 to a vacuum suction device (not shown) outside the mold 10. The gas vent passage 200 is provided with a gas vent means 3 constituted by a vacuum valve 32.

  In the present invention, a special passage structure X is provided in the gas vent passage 200 on the cavity 100 side from the gas vent means 3. This passage structure X constitutes a part of the gas vent passage 200 as a meandering passage. In this embodiment, the passage structure X is composed of the blocks 4.

  FIG. 2 is a lower perspective view of the block 4. The block 4 has a meandering passage 5 penetrating the block 4 vertically in the figure. The block 4 is configured by combining the first block piece 6 and the second block piece 7.

  FIG. 3 is a perspective view of the first block piece 6, FIG. 4 is a perspective view of the second block piece 7, and FIG. 5 is a longitudinal sectional view of the block 4 formed by combining both block pieces 6 and 7.

  As shown in FIG. 3, the first block piece 6 has an inlet groove 61, an inlet recess 62, a first protrusion 63, and a first recess 64 on the mating surface 60 from the bottom to the top in the figure. And a second convex portion 65, a second concave portion 66, a third convex portion 67, an outlet concave portion 68, and an outlet groove 69. The entrance groove 61 opens at the lower edge 601 of the mating surface 60, is formed deeper than the other recesses, and communicates with the entrance recess 62. As shown in FIG. 5, the first recess 64 is formed in an inverted M-shaped longitudinal section. That is, in the first recess 64, the bottom surface of the recess is raised in a mountain shape, and the height H1 of the raised portion 605 is smaller than the depth D1 of the first recess 64. The second recess 66 is the same as the first recess 64. The outlet groove 69 opens at the upper edge 602 of the mating surface 60, is formed at the same depth as the inlet groove 61, and communicates with the outlet recess 68. The first convex portion 63 is configured by a portion left between the entrance concave portion 62 and the first concave portion 64 on the mating surface 60. The second convex portion 65 is configured by a portion left on the mating surface 60 between the first concave portion 64 and the second concave portion 66. The third convex portion 67 is configured by a portion left on the mating surface 60 between the second concave portion 66 and the outlet concave portion 68. Furthermore, the length L1 of each convex part is set shorter than the length L2 of each concave part.

  As shown in FIG. 4, the second block piece 7 has, on the mating surface 70, a lower edge convex portion 71, a first concave portion 72, a first convex portion 73, There are two concave portions 74, second convex portions 75, third concave portions 76, and upper edge convex portions 77. As shown in FIG. 5, the first recess 72 is formed in an inverted M-shaped longitudinal section, similar to the first recess 64 of the first block piece 6. That is, in the first recess 72, the bottom surface of the recess is raised in a mountain shape, and the height H2 of the raised portion 705 is the same as the height H1 of the raised portion 605 of the first recess 64, and the depth D2 ( = D1) is smaller. The second recess 74 and the third recess 76 are the same as the first recess 72. The lower edge convex portion 71 is configured by a portion left between the lower edge 701 and the first concave portion 72 on the mating surface 70. The first convex portion 73 is configured by a portion left between the first concave portion 72 and the second concave portion 74 in the mating surface 70. The second convex portion 75 is configured by a portion left on the mating surface 70 between the second concave portion 74 and the third concave portion 76. The upper edge convex portion 77 is configured by a portion left between the third concave portion 76 and the upper edge 702 on the mating surface 70. Furthermore, each length L3 of the 1st convex part 73 and the 2nd convex part 75 is set shorter than the length L4 of each recessed part. Note that L3 = L1 and L4 = L2.

  And the unevenness | corrugation in the 1st block piece 6 and the unevenness | corrugation in the 2nd block piece 7 are shown in FIG. 5, when the mating surface 60 of the 1st block piece 6 and the mating surface 70 of the 2nd block piece 7 are match | combined. As described above, the convex portion of the second block piece 7 is opposed to the concave portion of the first block piece 6, and the concave portion of the second block piece 7 is opposed to the convex portion of the first block piece 6. .

  Therefore, the meandering passage 5 as shown by the arrow in FIG. 5 is configured in the block 4 of this embodiment by aligning the mating surface 60 of the first block piece 6 and the mating surface 70 of the second block piece 7. ing. Specific dimensions of the meandering passage 5 are, for example, L1 = L3 = 5.3 mm, L2 = L4 = 11.4 mm, D1 = D2 = 6.4 mm, and H1 = H2 = 3 mm.

  The block 4 having the above configuration is interposed in the gas vent passage 200 so that the meandering passage 5 constitutes a part of the gas vent passage 200.

  By the way, in die casting using the mold 10, when the molten metal is injected into the cavity 100 at a high speed by the injection unit 9, the vacuum valve 32 is properly opened and the cavity 100 is passed through the gas vent passage 200 by the vacuum suction device. The air inside is aspirated. Therefore, the injected molten metal flows into the gas vent passage 200. At this time, in the mold 10 provided with the block 4 having the above-described configuration, the molten metal flowing into the gas vent passage 200 reaches the block 4 and flows into the meandering passage 5 before reaching the gas vent means 3. The molten metal flowing into the meandering passage 5 meanders and flows while colliding with the concave portion and the convex portion. Therefore, the speed of the molten metal flowing into the gas vent passage 200 is extremely reduced in the block 4. Therefore, the molten metal that has passed through the block 4 reaches the gas venting means 3 at a moderate speed. Therefore, the molten metal that has flowed into the gas vent passage 200 is stopped almost certainly before the gas vent means 3 and does not reach the vacuum valve 32, and therefore does not spout out of the mold 10.

  That is, according to the mold 10 including the block 4 having the above-described configuration, the following operational effects can be exhibited.

(1) As described above, when the molten metal is injected into the cavity 100, the molten metal can be prevented from being ejected out of the mold 10 through the gas vent passage 200. That is, hot water spray can be prevented.

(2) Since the molten metal does not reach the vacuum valve 32, the molten metal cast piece does not remain in the vacuum valve 32. Therefore, clogging of the vacuum valve 32 can be prevented and vacuum suction can be performed satisfactorily.

  The first block piece 6 and the second block piece 7 of the block 4 are preferably provided with cooling water passages 6A and 7A as shown in FIGS.

  Further, in the present embodiment, as the block 4, as shown below, modified structures shown in FIGS. 8 to 16 may be adopted. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the block 4 shown in FIGS.

(First modification)
FIGS. 8-10 has shown the block 4 of the 1st modification. In this modified example, in the first block piece 6, the bottom surfaces of the concave portions of the first concave portion 64 and the second concave portion 66 are not raised, and are flat, and the depths of the concave portions 64, 66 are shallower than D1. ing. Similarly, in the second block piece 7, the bottom surfaces of the first concave portion 72, the second concave portion 74, and the third concave portion 76 are not raised, and are flat, and the concave portions 72, 74, 76 are also flat. Is shallower than D1. Others are the same as the block 4 shown in FIGS.

  Also according to this modified example, the meandering passage 5 is configured in the block 4, so that the same effect as the block 4 shown in FIGS. 1 to 7 can be exhibited.

(Second modification)
FIGS. 11-13 has shown the block 4 of the 2nd modification. In this modification, in the first block piece 6, the first recess 64 and the second recess 66 are recessed in an arc shape. Similarly, in the second block piece 7, the first recess 72, the second recess 74, and the third recess 76 are recessed in an arc shape. Others are the same as the block 4 shown in FIGS.

  Also according to this modified example, the meandering passage 5 is configured in the block 4, so that the same effect as the block 4 shown in FIGS. 1 to 7 can be exhibited.

(Third Modification)
FIGS. 14-16 has shown the block 4 of the 3rd modification. In this modification, in the first block piece 6, the first convex portion 63, the second convex portion 65, and the third convex portion 67 are each formed in a mountain shape and slightly protruding from the mating surface 60, Moreover, the 1st recessed part 64 and the 2nd recessed part 66 are hollow in the reverse mountain shape, respectively. Similarly, in the second block piece 7, the first convex portion 73 and the second convex portion 75 are each formed in a mountain shape and slightly projecting from the mating surface 70, and the first concave portion 72. The second recess 74 and the third recess 76 are recessed in an inverted mountain shape, respectively. Others are the same as the block 4 shown in FIGS.

  Also according to this modified example, the meandering passage 5 is configured in the block 4, so that the same effect as the block 4 shown in FIGS. 1 to 7 can be exhibited.

  As described above, according to the block 4 of the first embodiment, various forms of the meandering passage 5 can be configured. Moreover, the block 4 can be exchanged for the mold 10. That is, according to the first embodiment, the meandering passage 5 that can be exchanged for the mold 10 and has any form can be configured. Therefore, it is possible to easily realize the optimum passage structure X for preventing the hot water spray.

  In the first embodiment, the number, size, or form of irregularities formed on the block 4 is limited to the above-described one as long as the meandering passage can be formed in the block 4 and the speed of the molten metal can be reduced by the meandering passage. It is not a thing.

[Second Embodiment]
FIG. 17 is a longitudinal sectional view showing another example of a die-casting mold that employs the hot water spray preventing structure of the present invention. Portions that are the same as or correspond to those in FIG. 1 of the first embodiment are denoted by the same reference numerals. In the first embodiment, the passage structure X in which a part of the gas vent passage 200 is configured as a meandering passage is realized by the block 4, but in the present embodiment, the passage structure X is replaced by a part of the gas vent passage 200 itself. This is realized by configuring as a meandering passage.

  18 is an enlarged view of the passage structure X of FIG. The passage structure X has the same unevenness as that formed on the mating surface 60 of the first block piece 6 shown in FIG. 3 of the first embodiment on one side 201 of the opposing surface constituting part of the gas vent passage 200 itself. This is realized by forming the shape and forming the other concavo-convex shape on the other 202 on the mating surface 70 of the second block piece 7 shown in FIG. 4 of the first embodiment. Therefore, the passage structure X has the meandering passage 5 having the same form as the block 4 shown in FIG.

  Also in the present embodiment, the meandering passage 5 is formed on the cavity 100 side of the gas venting passage 200 from the gas venting means 3, so that the same operational effects as those in the first embodiment can be exhibited.

  Moreover, according to this embodiment, since the uneven | corrugated form is formed in the opposing surface which comprises some gas venting passages 200 itself, the meandering channel | path 5 can be comprised with respect to the metal mold | die 10 with easy operation | work. Therefore, according to the present embodiment, the passage structure X can be realized with good workability.

  In addition, the uneven | corrugated form formed in the opposing surfaces 201 and 202 which comprise some gas venting paths 200 may be the same as the case of the 1st-3rd modification of 1st Embodiment. Also by this, since the meandering passage 5 is configured on the cavity 100 side of the gas venting passage 200 with respect to the gas venting means 3, the same effect as the first embodiment can be exhibited.

[Another embodiment]
As shown in FIG. 19, the block 4 of the first embodiment may be provided in the gas vent passage 200 of the mold 10 in which the gas venting means 3 is constituted by the chill vent 31, and as shown in FIG. You may provide the channel | path structure X of 2nd Embodiment.

  Also by this, since the meandering passage 5 is configured on the cavity 100 side of the gas venting passage 200 with respect to the gas venting means 3, the same effect as the first embodiment can be exhibited.

  Moreover, since the molten metal can be stopped almost certainly before the chill vent 31, it is not necessary to reduce the gap 311 between the jagged irregularities of the chill vent 31 facing each other in order to stop the molten metal. That is, the gap 311 can be set wide. Therefore, even if the molten metal flows into the chill vent 31 and solidifies in the gap 311, the solidified molten metal becomes thick, so that it is difficult to break when the molded product is pushed out from the mold 10, and it breaks and hinders the subsequent process. It will never be.

  Since the present invention can prevent hot water spraying, the industrial utility value is great.

It is a longitudinal cross-sectional view which shows the die-casting die which employ | adopted the hot-blow prevention structure of 1st Embodiment. It is a downward perspective view of the block of a 1st embodiment. It is a perspective view of the 1st block piece of a 1st embodiment. It is a perspective view of the 2nd block piece of 1st Embodiment. It is a longitudinal cross-sectional view of the block formed by combining both block pieces of the first embodiment. It is a perspective view which shows the cooling water channel | path of the 1st block piece of 1st Embodiment. It is a perspective view which shows the cooling water channel | path of the 2nd block piece of 1st Embodiment. It is a perspective view of the 1st block piece of the 1st modification of 1st Embodiment. It is a perspective view of the 2nd block piece of the 1st modification of 1st Embodiment. It is a longitudinal cross-sectional view of the block which put together both the block pieces of the 1st modification of 1st Embodiment. It is a perspective view of the 1st block piece of the 2nd modification of 1st Embodiment. It is a perspective view of the 2nd block piece of the 2nd modification of 1st Embodiment. It is a longitudinal cross-sectional view of the block which combines both the block pieces of the 2nd modification of 1st Embodiment. It is a perspective view of the 1st block piece of the 3rd modification of 1st Embodiment. It is a perspective view of the 2nd block piece of the 3rd modification of 1st Embodiment. It is a longitudinal cross-sectional view of the block which combines both the block pieces of the 3rd modification of 1st Embodiment. It is a longitudinal cross-sectional view which shows the metal mold | die for die-casting which employ | adopted the hot-blow prevention structure of 2nd Embodiment. It is an enlarged view of the channel | path structure of FIG. It is a longitudinal cross-sectional view which shows the die-casting die which is an example of another embodiment. It is a longitudinal cross-sectional view which shows the die-casting metal mold | die which is another example of another embodiment. It is a longitudinal cross-sectional view which shows the conventional die-casting metal mold | die provided with the degassing means comprised by the chill vent. It is a longitudinal cross-sectional view which shows the conventional die-casting metal mold | die provided with the degassing means comprised by the vacuum valve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Mold 100 Cavity 200 Gas venting path 201, 202 Wall 3 Gas venting means 31 Chill vent 32 Vacuum valve 4 Block 5 Meandering path 6 1st block piece 60 Matching surface 63 1st convex part 64 1st recessed part 65 2nd convex part 66 2nd recessed part 67 3rd convex part 7 2nd block piece 70 Mating surface 72 1st recessed part 73 1st convex part 74 2nd recessed part 75 2nd convex part 76 3rd recessed part X channel | path structure

Claims (3)

In the mold, the gas vent passage is provided with a gas venting means constituted by a vacuum valve or a chill vent for venting the gas in the mold cavity to prevent the molten metal from being ejected beyond the gas venting means. For preventing water spray,
The degassing passage is provided on the cavity side from the degassing means,
A mold blow prevention structure having a passage structure in which a part of a gas vent passage is configured as a meandering passage. The passage structure is composed of blocks having meandering passages,
The block is composed of two block pieces,
The mating surfaces of the two block pieces are each formed with concavities and convexities so that the concave and convex portions face each other.
The mold blow prevention structure according to claim 1, wherein the block constitutes a meandering passage by the unevenness of the mating surfaces of the two block pieces. The passage structure is constituted by a part of the gas vent passage itself,
The both walls of the part of the gas vent passage facing each other are formed in a concavo-convex shape so that the concave portion and the convex portion face each other, thereby constituting a meandering passage. The structure for preventing hot water spraying of the described mold.

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