JP5184418B2 - Chill block - Google Patents

Description

  The present invention relates to a chill block provided in a mold.

  A die casting method called die casting is known in which a molten metal such as aluminum is press-fitted into a die cavity to produce a high-precision casting in a large amount in a short time (see Patent Document 1).

  Patent Document 1 discloses a technique for preventing molten metal from being blown by forming a part of a gas vent passage provided in such a die casting die as a meandering passage. The degassing passage here is a passage for extracting gas from the cavity. However, on the other hand, the molten metal press-fitted into the cavity can also be ejected out of the mold (that is, hot water spray) through the gas vent passage. Therefore, by reducing the speed of the molten metal flowing into the gas vent passage by the meandering passage, it is intended to prevent the molten metal from blowing.

JP 2008-114280 A

  However, the technique disclosed in Patent Document 1 has a problem of damaging each uneven portion forming the meandering passage. This is because the flow passage cross-sectional area of the meandering passage is smaller than the flow passage cross-sectional area of the gas vent passage, so that the speed of the molten metal flowing through the meandering passage damages the uneven portions (for example, about 40 m / s). Because it will be faster.

  Moreover, there has been a problem that it is not possible to properly prevent the molten metal from blowing. This is because, in addition to the high speed of the molten metal flowing through the meandering passage, the meandering passage is linear from the entrance to the exit of the passage, so that the speed of the melt is reduced especially in the center of the meandering passage. It is because it cannot be done.

  Furthermore, the situation where the powder which the molten metal solidified remained on the flow path outer side of a meandering channel | path had arisen. This is because the velocity of the molten metal at the center of the flow path of the meandering passage is faster than the outside of the flow passage, so that a vortex is generated from the center of the flow path of the meandering passage toward the outside of the flow path. Conceivable.

  The present invention has been made in view of such a technical problem, and an object of the present invention is to provide a chill block that prevents damage to itself and appropriately prevents molten metal from blowing.

The present invention includes a mold cavity, and a vacuum source, between a chill blocks provided the gas vent passage communicating an inlet groove molten metal flowing from said cavity, communicating with said inlet channel, wherein a branch groove for branching molten metal flowing from the inlet channel in the inflow direction substantially perpendicular two directions of the molten metal, the molten metal which is branched by the branch grooves in two directions, a merging groove for combining again, and the branch groove two communicating groove for communicating the merging groove, communicating with the merging groove, an outlet groove molten metal flows out, is formed, a first mold in which the branch groove and the merging grooves are formed, the And a second mold in which the inlet groove, the communication groove, and the outlet groove are formed.

According to the present invention, first, the molten metal flowing into the chill block is branched in two directions substantially perpendicular to the flowing direction of the molten metal, so that the pressure of the molten metal is dispersed. In addition, the surface area of the passage through which the molten metal flows is substantially increased by passing the branched molten metal through the two communication passages. Thereby, the cooling property of the molten metal is improved and the speed of the molten metal is reduced. Therefore, it is possible to prevent the chill block itself from being damaged and appropriately prevent the molten metal from blowing. In addition, the two-layer structure is constituted by a branching groove and a joining groove formed in the first mold and an inlet groove, a communication groove and an outlet groove formed in the second mold, so that it has a one-layer structure. The flow path length of the molten metal can be made longer than the case. As the flow path length of the molten metal is longer, the cooling property of the molten metal can be improved, so that breakage of the chill block itself can be more appropriately prevented and molten metal spraying can be more appropriately prevented.

It is a figure which shows an example of the metal mold | die which has a chill block which concerns on one Embodiment of this invention. It is a figure which shows schematic structure of the chill block which concerns on one Embodiment of this invention. It is a perspective view of the movable block which concerns on 1st embodiment. It is a perspective view of the fixed type block concerning a first embodiment. It is sectional drawing of the chill block which concerns on 1st embodiment. It is a perspective view which shows the cooling water path of the movable block which concerns on 1st embodiment. It is a perspective view which shows the cooling water channel | path of the fixed block which concerns on 1st embodiment. It is a perspective view of the movable block which concerns on 2nd embodiment. It is a perspective view of the fixed block which concerns on 2nd embodiment. It is sectional drawing of the chill block which concerns on 2nd embodiment. It is a perspective view which shows the cooling water path of the movable block which concerns on 2nd embodiment. It is a perspective view which shows the cooling water channel | path of the fixed block which concerns on 2nd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[First embodiment]
First, a first embodiment of the present invention will be described.

(Configuration of mold 10)
FIG. 1 is a view showing an example of a mold 10 having a chill block 7 according to an embodiment of the present invention. A mold 10 shown in FIG. 1 includes a movable mold 1, a fixed mold 2, a cavity 3, an injection unit 4, a gas vent passage 5, a vacuum valve 6, a chill block 7, and the like.

  The movable mold 1 is a mold that can move with respect to the fixed mold 2. The fixed mold 2 is a mold whose position is fixed. The cavity 3 is a space that is formed by the movable mold 1 and the fixed mold 2 and has substantially the same shape as a molded product by the mold 10. The molten metal injected by the injection unit 4 flows into the cavity 3 from the molten metal passage 42.

  The injection unit 4 is provided in the fixed mold 2 and injects a molten metal such as aluminum into the cavity 3. The injection unit 4 includes a hot water supply port 41 for supplying molten metal, a molten metal channel 42 that is a flow path of molten metal supplied from the hot water supply port 41, an injection blanker 43 that injects the molten metal in the molten metal channel 42 toward the cavity 3, and an injection blanker. 43 is constituted by an injection sleeve 44 provided for sliding inside the molten metal passage 42.

  The gas vent passage 5 is formed by the movable die 1 and the fixed die 2 and is a passage formed for venting the gas inside the cavity 3. The gas vent passage 5 communicates with a vacuum valve 6 provided outside the mold 10.

  The vacuum valve 6 is a decompression source provided outside the mold 10, and is an open / close valve that leads to the gas vent passage 5. The vacuum valve 6 is connected to a vacuum suction device 61. When casting using this mold 10, the vacuum suction device 61 sucks the gas in the cavity 3 through the vacuum valve 6 to make the inside of the cavity 3 vacuum and decompressed. This is to suppress air entrainment and oxide generation.

  The chill block 7 is a block provided between the vacuum valve 6 and the cavity 3 in the gas vent passage 5. The chill block 7 according to the present embodiment is characterized in that it can prevent its own breakage and appropriately prevent molten metal from being blown. Hereinafter, such a chill block 7 will be described.

(Schematic configuration of chill block 7)
FIG. 2 is a diagram showing a schematic configuration of the chill block 7 according to one embodiment of the present invention. As shown in FIG. 2, the chill block 7 is configured by combining a movable block 8 and a fixed block 9. The movable block 8 is a block piece provided in the movable mold 1 of FIG. The fixed mold block 9 is a block piece provided in the fixed mold 2 of FIG.

  Further, a molten metal passage 11 is formed in the chill block 7. The molten metal passage 11 referred to here is a molten metal passage inside the chill block 7 and communicates with the gas vent passages 5 before and after the chill block 7. The molten metal passage 11 is formed by the movable block 8 and the fixed block 9.

(Detailed configuration of chill block 7)
FIG. 3 is a perspective view of the movable block 8 according to the first embodiment. FIG. 4 is a perspective view of the fixed block 9 according to the first embodiment. FIG. 5 is a cross-sectional view of the chill block 7 according to the first embodiment.

  In the movable block 8 shown in FIG. 3, an inlet groove 81, an outlet groove 82, a first communication groove 83, and a second communication groove 84 are formed on the mating surface 80.

  The entrance groove 81 is a recess formed in the center of the lower edge portion 80a of the mating surface 80 in a direction perpendicular to the lower edge portion 80a. The entrance groove 81 is formed such that the depth of the groove becomes shallower as it is farther from the lower edge portion 80a. In addition, the chill block 7 leads to the gas vent passage 5 on the cavity 3 side. The exit groove 82 is a recess formed in the center of the upper edge 80b of the mating surface 80 in a direction perpendicular to the upper edge 80b. The outlet groove 82 is formed such that the depth of the groove becomes shallower as it is farther from the upper edge 80b. Further, it leads to a gas vent passage 5 closer to the vacuum valve 6 than the chill block 7. The first communication groove 83 is a substantially rectangular parallelepiped recess formed on the mating surface 80 in parallel with the inlet groove 81 (or outlet groove 82) and offset from the inlet groove 81 (or outlet groove 82) by a certain distance. . The second communication groove 84 is parallel to the side facing the first communication groove 83 across the inlet groove 81 (or the outlet groove 82) on the mating surface 80 and offset by a certain distance from the inlet groove 81 (or the outlet groove 82). It is the substantially rectangular parallelepiped shaped recessed part formed in this way.

  In the fixed block 9 shown in FIG. 4, a branching groove 91 and a joining groove 92 are formed on the mating surface 90.

  The branch groove 91 is recessed upward from FIG. 4 from a T-shaped recess 91a formed at a certain distance from the lower edge portion 90a of the mating surface 90 and a branch point 91b that is the approximate center of the branch. This is a cross-shaped recess formed by a wall portion 91c having a wall surface at a position. The merge groove 92 is an inverted T-shaped recess formed at a position away from the upper edge 90 b of the mating surface 90 by a certain distance.

  The configuration of each of the movable block 8 and the fixed block 9 has been described above with reference to FIGS. 3 and 4. By matching the mating surface 80 of the movable block 8 and the mating surface 90 of the fixed block 9, the chill block 7 and the molten metal passage 11 shown in FIG. 5 are formed.

(Flow of molten metal in molten metal passage 11 (action of chill block 7))
Fig.5 (a) is sectional drawing which looked at the chill block 7 which concerns on 1st embodiment from the side direction A of FIG. FIG.5 (b) is sectional drawing which looked at the chill block 7 which concerns on 1st embodiment from the perpendicular direction B of FIG.

  In the chill block 7 shown in FIGS. 5A and 5B, the molten metal passage 11 is formed by the grooves 81 to 84 of the movable block 8 and the grooves 91 and 92 of the fixed block 9. The molten metal passage 11 creates a molten metal flow as described below inside the chill block 7.

  First, the molten metal flows from the inlet groove 81 of the movable block 8 and flows into the branch groove 91 (recess 91 a) of the fixed block 9 facing the inlet groove 81. The molten metal that has flowed into the branch groove 91 travels along the inflow direction as it is and collides with the wall 91c. The molten metal that has collided with the wall portion 91c branches and flows in two directions, ie, a first branch groove 91d and a second branch groove 91e that constitute the recess 91a.

  The molten metal branched toward the first branch groove 91d flows into the first communication groove 83 (pocket portion 83a) of the movable block 8 facing the first branch groove 91d. The molten metal that has flowed into the first communication groove 83 travels directly inside the first communication groove 83 and collides with the wall portion 83c of the pocket portion 83b. The molten metal colliding with the wall 83c flows into the joining groove 92 (first joining groove 92a) of the fixed block 9 facing the pocket 83b.

  On the other hand, the molten metal branched toward the second branch groove 91e in the branch groove 91 flows into the second communication groove 84 (pocket portion 84a) of the movable block 8 facing the second branch groove 91e. The molten metal that has flowed into the second communication groove 84 travels directly inside the second communication groove 84 and collides with the wall portion 84c of the pocket portion 84b. The molten metal colliding with the wall portion 84c flows into the merging groove 92 (second merging groove 92b) of the fixed block 9 facing the pocket portion 84b.

  In this way, the molten metal flowing into the joining groove 92 from each of the first joining groove 92 a and the second joining groove 92 b joins at the joining point 92 c of the joining groove 92. The joined molten metal flows out to the gas vent passage 5 through the outlet groove 82 of the movable block 8 facing the joining groove 92.

  As described above, the inlet groove 81 and the outlet groove 82 of the movable block 8 function as an inlet path for flowing in the molten metal and an outlet path for flowing out, respectively. Further, the first communication groove 83 and the second communication groove 84 of the movable block 8 function as a communication path that connects the branch groove 91 and the junction groove 92 of the fixed block 9. On the other hand, the branching groove 91 and the joining groove 92 of the fixed block 9 are respectively a branching part that branches the molten metal that has flowed into the chill block 7 in two directions perpendicular to the flowing direction, and the molten metal that is branched in the branched groove 91. It functions as a merging section that merges the flow of water. Furthermore, each wall part 91c, 83c, 84c (refer FIG.5 (b)) is a recessed part which has a wall surface in the position dented toward the flow direction of a molten metal, and the pressure reduction means which weakens the pressure of the molten metal which flowed in And it functions as a speed reduction means for reducing the speed of the molten metal.

(Effect of chill block 7)
The flow of the molten metal in the molten metal passage 11 (the action of the chill block 7) has been described above with reference to FIG. Next, the effect of such a chill block 7 will be described.

  In this chill block 7, the molten metal flowing in from the inlet groove 81 is first applied to the wall portion 91 c formed to be recessed with respect to the flowing direction, thereby reducing the pressure of the flowing molten metal and reducing the speed of the molten metal. Yes. Further, the molten metal applied to the wall 91c is branched in the direction of the first branch groove 91d and the second branch groove 91e (two directions perpendicular to the inflow direction of the molten metal), thereby dispersing the molten metal pressure and the molten metal. The cooling performance is improved. The reason why the cooling property of the molten metal is improved is that the surface area of the passage through which the molten metal flows substantially increases. Therefore, it is possible to prevent the chill block 7 itself from being damaged and appropriately prevent the molten metal from blowing.

  Further, in the chill block 7, each of the melts branched in two directions is further applied to the wall portions 83c and 84c, thereby further reducing the pressure of the melt that has flowed in and further reducing the speed of the melt. Therefore, it is possible to more appropriately prevent the chill block 7 itself from being damaged and more appropriately prevent the molten metal from being blown.

  In the chill block 7, the molten metal passage 11 has a two-layer structure as shown in FIGS. That is, the grooves 81 to 84 formed in the movable block 8 and the grooves 91 and 92 formed in the fixed block 9 are configured in two layers. Thereby, the flow path length of a molten metal can be lengthened rather than the case where it is a 1 layer structure. As the flow path length of the molten metal is longer, the cooling property of the molten metal can be improved, so that the chill block 7 can be more appropriately prevented from being damaged and the molten metal can be more appropriately prevented from being blown.

  In the chill block 7, the flow direction of the molten metal is not linear from the inlet groove 81 toward the outlet groove 82. For this reason, it is possible to prevent the position of the molten metal flowing through the interior from being biased between positions, and to prevent the situation where the molten powder remains inside due to the influence of the vortex. Furthermore, since the flow path direction of the molten metal is divided into two directions and then merged again, the layout can be improved.

  The movable block 8 and the fixed block 9 are preferably provided with cooling water passages 88 and 98 as shown in FIGS. FIG. 6 is a perspective view showing a cooling water passage of the movable block 8 according to the first embodiment. FIG. 7 is a perspective view showing a cooling water passage of the fixed block 9 according to the first embodiment.

  The cooling water passage 88 shown in FIG. 6 is configured to pass directly below the first communication groove 83 and the second communication groove 84 of the movable block 8. Also, the cooling water passage 98 shown in FIG. 7 is configured to pass directly under the branch groove 91 of the fixed block 9. Thereby, the cooling property of the molten metal which flows through each groove | channel 83,84,91 can be improved. In addition, when the molten metal is cooled, the viscosity increases and the speed of the molten metal decreases, so that the speed of the molten metal can also be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  Since the overall configuration of the mold 10 and the schematic configuration of the chill block 7 according to the second embodiment are the same as those of the first embodiment described above, description thereof is omitted here (see FIGS. 1 and 2).

(Detailed configuration of chill block 7)
FIG. 8 is a perspective view of the movable block 8 according to the second embodiment. FIG. 9 is a perspective view of the fixed block 9 according to the second embodiment. FIG. 10 is a cross-sectional view of the chill block 7 according to the second embodiment.

  In the movable block 8 shown in FIG. 8, an inlet groove 85 and an outlet groove 86 are formed on the mating surface 80.

  The entrance groove 85 is a substantially T-shaped recess formed in the center of the lower edge 80a of the mating surface 80 in a direction perpendicular to the lower edge 80a. The inlet groove 85 is formed so that the depth of the groove becomes shallower as it is farther from the lower edge portion 80a. Further, the inlet groove 85 is formed in a square shape which is inclined downward (front side) in FIG. Furthermore, it leads to the gas vent passage 5 on the cavity 3 side of the chill block 7. The exit groove 86 is a substantially inverted T-shaped recess formed in the center of the upper edge 80b of the mating surface 80 in a direction perpendicular to the upper edge 80b. The exit groove 86 is formed so that the depth of the groove becomes shallower as the distance from the upper edge portion 80b increases. Further, the outlet groove 86 is formed in an inverted square shape that is inclined downward (front side) in FIG. The outlet groove 86 communicates with the gas vent passage 5 closer to the vacuum valve 6 than the chill block 7.

  In the fixed block 9 shown in FIG. 9, a first communication groove 93 and a second communication groove 94 are formed on the mating surface 90.

  The first communication groove 93 is a substantially rectangular parallelepiped recess formed obliquely on the mating surface 90 so as to expand outward from the lower edge portion 90a toward the upper edge portion 90b. Similar to the first communication groove 93, the second communication groove 94 is a substantially rectangular parallelepiped recess formed obliquely so as to expand outward from the lower edge portion 90 a toward the upper edge portion 90 b inside the mating surface 90. .

  The configurations of the movable block 8 and the fixed block 9 have been described above with reference to FIGS. 8 and 9. By matching the mating surface 80 of the movable block 8 and the mating surface 90 of the fixed block 9, the chill block 7 and the molten metal passage 11 shown in FIG. 10 are formed.

(Flow of molten metal in molten metal passage 11 (action of chill block 7))
FIG. 10A is a cross-sectional view of the chill block 7 according to the second embodiment as viewed from the lateral direction A of FIG. FIG.10 (b) is sectional drawing which looked at the chill block 7 which concerns on 2nd embodiment from the perpendicular direction B of FIG.

  In the chill block 7 shown in FIGS. 10A and 10B, the molten metal passage 11 is formed by the grooves 85 and 86 of the movable block 8 and the grooves 93 and 94 of the fixed block 9. The molten metal passage 11 creates a molten metal flow as described below in the chill block 7.

  First, the molten metal flows in from the inlet groove 85 of the movable block 8, proceeds along the inflow direction as it is, and collides with the wall portion 85b of the branch point 85a. The molten metal that has collided with the wall portion 85b is formed in a first branch groove 85c and a second branch groove along the wall portion 85b of the inlet groove 85 that is formed in the shape of a leg facing the melt inflow direction. 85e branches in two directions and flows.

  The molten metal branched toward the first branch groove 85c directly collides with the wall portion 85d of the first branch groove 85c. The molten metal colliding with the wall portion 85d flows into the first communication groove 93 (pocket portion 93a) of the fixed block 9 facing the first branch groove 85c. The molten metal that has flowed into the first communication groove 93 travels directly inside the first communication groove 93 and collides with the wall portion 93c of the pocket portion 93b. The molten metal colliding with the wall portion 93c flows into the outlet groove 86 (first joining groove 86b) of the movable block 8 facing the pocket portion 93b.

  On the other hand, the molten metal branched toward the second branch groove 85e in the inlet groove 85 directly collides with the wall portion 85f of the second branch groove 85e. The molten metal colliding with the wall portion 85f flows into the second communication groove 94 (pocket portion 94a) of the fixed block 9 facing the second branch groove 85e. The molten metal flowing into the second communication groove 94 advances through the second communication groove 94 as it is and collides with the wall portion 94c of the pocket portion 94b. The molten metal colliding with the wall portion 94c flows into the outlet groove 86 (second merging groove 86c) of the movable block 8 facing the pocket portion 94b.

  In this way, the molten metal flowing into the outlet groove 86 from each of the first joining groove 86 b and the second joining groove 86 c joins inside the outlet groove 86. The merged molten metal flows out to the gas vent passage 5 through the outlet groove 86.

  As described above, the inlet groove 85 and the outlet groove 86 of the movable block 8 function as an inlet path for flowing molten metal and an outlet path for flowing out, respectively. In addition, it functions as a branching part that branches the molten metal that has flowed into the chill block 7 in two directions substantially perpendicular to the inflow direction, and a merging part that merges the flow of the molten metal branched in the inlet groove 85. On the other hand, the first communication groove 93 and the second communication groove 94 of the fixed block 9 function as communication paths that connect the inlet groove 85 and the outlet groove 86 of the movable block 8. Furthermore, each wall part 85b, 85d, 85f, 93c, 94c (refer FIG.10 (b)) is a recessed part which has a wall surface in the position dented toward the flow direction of a molten metal, The pressure of the molten metal which flowed in It functions as a pressure reducing means for weakening and a speed reducing means for reducing the speed of the molten metal.

(Effect of chill block 7)
The flow of the molten metal in the molten metal passage 11 (the action of the chill block 7) has been described above with reference to FIG. Next, the effect of such a chill block 7 will be described.

  In the chill block 7, first, the molten metal flowing in from the inlet groove 85 is applied to the wall portion 85 b perpendicular to the flowing direction, thereby reducing the pressure of the flowing molten metal and reducing the speed of the molten metal. Further, the molten metal applied to the wall 85b is branched in the direction of the first branch groove 85c and the second branch groove 85e (two directions substantially perpendicular to the inflow direction of the melt), thereby dispersing the pressure of the melt. The cooling property of the molten metal is improved. The reason why the cooling property of the molten metal is improved is that the surface area of the passage through which the molten metal flows substantially increases. Therefore, it is possible to prevent the chill block 7 itself from being damaged and appropriately prevent the molten metal from blowing.

  Moreover, in this chill block 7, the pressure of the molten metal which flowed in is further applied to each of the wall part 85d and the wall part 93c, the wall part 85f, and the several wall part of the wall part 94c, respectively. Is further weakened than in the first embodiment, and the speed of the molten metal is further reduced. Therefore, it is possible to more appropriately prevent the chill block 7 itself from being damaged and more appropriately prevent the molten metal from being blown.

  Further, in the chill block 7, an inlet groove 85 and an outlet groove 86 are formed in a U shape as shown in FIG. 8, and the first communication groove 93 and the second communication groove 94 are formed in a chill block as shown in FIG. The length of the flow path of the molten metal is made longer than that of the first embodiment described above by forming it obliquely with respect to the inflow direction of the molten metal to No.7. As the flow path length of the molten metal is longer, the cooling property of the molten metal can be improved, so that the chill block 7 can be more appropriately prevented from being damaged and the molten metal can be more appropriately prevented from being blown.

  In the chill block 7, the flow direction of the molten metal is not linear from the inlet groove 85 toward the outlet groove 86. For this reason, it is possible to prevent the position of the molten metal flowing through the interior from being biased between positions, and to prevent the situation where the molten powder remains inside due to the influence of the vortex. Furthermore, since the flow path direction of the molten metal is divided into two directions and then merged again, the layout can be improved.

  The movable block 8 and the fixed block 9 are preferably provided with cooling water passages 89 and 99 as shown in FIGS. FIG. 11 is a perspective view showing the cooling water passage 89 of the movable block 8 according to the second embodiment. FIG. 12 is a perspective view showing the cooling water passage 99 of the fixed block 9 according to the second embodiment.

  The cooling water passage 89 shown in FIG. 11 is configured to pass directly under the inlet groove 85 and the outlet groove 86 of the movable block 8. Further, the cooling water passage 99 shown in FIG. 12 is configured to pass directly below the first communication groove 93 and the second communication groove 94 of the fixed block 9. Thereby, the coolability of the molten metal which flows through each groove | channel 85,86,93,94 can be improved. In addition, when the molten metal is cooled, the viscosity increases and the speed of the molten metal decreases, so that the speed of the molten metal can also be reduced.

(Summary)
According to the chill block 7 according to the first embodiment, first, the molten metal that has flowed into the chill block 7 is moved toward the first branch groove 91d and the second branch groove 91e (two directions substantially perpendicular to the molten metal inflow direction). The pressure of the molten metal is dispersed by branching it into In addition, the surface area of the passage through which the molten metal flows is substantially increased by flowing the branched molten metal through the two communication paths 83 and 84. Thereby, the cooling property of the molten metal is improved and the speed of the molten metal is reduced. Therefore, it is possible to prevent the chill block 7 itself from being damaged and appropriately prevent the molten metal from being blown (effect of the invention according to claim 1).

  Further, according to the chill block 7 according to the first embodiment, the fixed block 9 in which the branching groove 91 and the joining groove 92 are formed, and the movable in which the first communication path 83 and the second communication path 84 are formed. The mold block 8 has a two-layer structure. By constituting in two layers, the flow path length of the molten metal can be made longer than in the case of one layer. The longer the molten metal flow path length is, the higher the cooling property of the molten metal is, so that the chill block 7 itself can be more appropriately prevented from being damaged, and the molten metal can be more appropriately prevented from being blown (claim 2). Effects of the described invention).

  Further, according to the chill block 7 according to the first embodiment, the branch groove 91 has the wall portion 91c that is recessed toward the inflow direction of the molten metal at the branch point 91b. By applying the molten metal flowing in from the inlet groove 81 to the wall portion 91c, the pressure of the molten molten metal can be weakened and the speed of the molten metal can be reduced (effect of the invention according to claim 3).

  In addition, according to the chill block 7 according to the second embodiment, the inlet groove 85 is formed in a square shape that forms an open leg shape facing the inflow direction of the molten metal. By applying the molten metal flowing in from the inlet groove 85 to the wall portion 85b of the branching point 85a at the center of the U-shaped inlet groove 85, the pressure of the molten metal can be reduced and the speed of the molten metal can be reduced. (Effect of the invention of claim 4).

  Further, according to the chill block 7 according to the first embodiment, each of the two communication passages 83, 84 has pocket portions 83 b, 84 b that are connection portions between the communication passages 83, 84 and the joining groove 92. Recessed walls 83c and 84c are formed in the flow direction of the molten metal. By applying the molten metal flowing through the communication passages 83 and 84 to the walls 83c and 84c, the pressure of the molten metal can be further reduced and the speed of the molten metal can be further reduced (the invention according to claim 5). effect).

  Further, according to the chill block 7 according to the second embodiment, the two communication passages 93 and 94 are formed obliquely with respect to the molten metal inflow direction. Therefore, the flow path length of the molten metal can be lengthened, and accordingly the cooling property of the molten metal can be enhanced (effect of the invention according to claim 6).

  Each embodiment of the present invention has been described above. However, each of the above embodiments shows one application example of the present invention, and the technical scope of the present invention is limited to the specific configuration of each of the above embodiments. It is not the purpose.

  For example, in the above description, it has been described that the first communication groove 83 and the second communication groove 84 in FIG. 5 function as communication paths that connect the branch groove 91 and the joining groove 92 of the fixed block 9. Not limited to this case. That is, the communication path shown in the claims may indicate all or a part of the molten metal flow path from the branch point 91b to the junction 92c.

  Further, for example, in the above description, it has been described that the first communication groove 93 and the second communication groove 94 in FIG. 10 function as communication paths that connect the inlet groove 85 and the outlet groove 86 of the movable block 8. However, this is not the only case. That is, the communication path shown in the claims may indicate all or part of the flow path of the molten metal from the branch point 85a to the junction point 86a.

1 Movable mold 2 Fixed mold 3 Cavity 5 Degassing passage 6 Vacuum valve (depressurization source)
7 Chill block 10 Mold 11 Molten passage 83 First communication groove (first communication passage)
83b Pocket part (connection part)
83c wall part 84 2nd communicating groove (2nd communicating path)
84b Pocket part (connection part)
84c Wall part 91 Branch groove (branch part)
91b Junction point 91c Wall part 92 Joining groove (joining part)
92c confluence

Claims (5)

A chill block provided in a gas vent passage communicating between a mold cavity and a reduced pressure source,
An inlet groove into which the molten metal flows from the cavity;
Said communicating with the inlet channel, the branch groove for branching molten metal flowing from the inlet channel in the inflow direction substantially perpendicular two directions of the molten metal,
The molten metal which is branched by the branch grooves in two directions, a merging groove for combining again,
Two communicating grooves communicating the branching groove and the merging groove ;
An outlet groove communicating with the merging groove and flowing out of the molten metal;
Formed,
A first mold in which the branch groove and the merging groove are formed;
A chill block comprising: a second mold having the inlet groove , the communication groove, and the outlet groove . The branch groove is
A first branch groove and a second branch groove branched in two T-shaped directions from the inflow direction of the molten metal;
A wall portion disposed at a branch point between the first branch groove and the second branch groove and recessed toward the downstream side in the molten metal inflow direction from the branch point;
Chill block according to claim 1, characterized in that but formed. 2. The chill block according to claim 1, wherein the branch groove is formed in a square shape having an open leg shape so as to face an inflow direction of the molten metal. 4. The wall according to claim 1, wherein each of the two communication grooves is formed with a wall portion that is recessed in a flow direction of the molten metal from a connection portion between the communication groove and the junction groove . The chill block according to one item. The chill block according to any one of claims 1 to 4, wherein the two communication grooves are formed in an inverted C shape that is arranged so as to open toward the merging groove .

Images