JP5939834B2 - Chill vent and casting mold - Google Patents

Description

  The present invention relates to a chill vent and a casting mold provided with the chill vent.

Die-cast products are cast by filling a mold cavity with a molten metal such as aluminum in a short time. For this reason, the air in the cavity may be caught in the molten metal at the time of filling, causing deterioration of product quality such as gas defects.
As a countermeasure, connect multiple overflow runners that allow the molten metal to overflow at the final filling site of the product section, and discharge only the air in the mold outside the mold to the end of the overflow runner. It is common to provide a chill vent that prevents air from blowing into the product to prevent air from getting into the product and to improve product quality. (For example, refer to Patent Document 1).

JP 2003-164945 A

When a plurality of overflow runners are merged upstream of the chill vent, the molten metal flowing from each overflow runner collides with the merged portion, and the pressure of the molten metal increases, which may cause burrs in the mold.
On the other hand, if the overflow runner is made independent up to the chill vent, and the molten metal passage connected to the chill vent from each overflow runner is formed independently, the chill vent becomes large. In addition, if each molten metal passage is made small in order to suppress an increase in the size of the chill vent, the molded piece formed by solidifying the molten metal in each molten metal passage has low rigidity and may be broken when the product is taken out and remain in the mold. If the mold is rapidly cooled and falls into a cooling tank for heat treatment, the operating rate of the mold is reduced.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a chill vent and a casting mold capable of improving the rigidity of a molded piece formed on the occurrence of burrs and a chill vent portion. To do.

In order to achieve the above object, the present invention provides a chill vent including a chill vent portion that stops the flow of molten metal, and includes a runner merging portion that is located upstream of the chill vent portion and is connected to a plurality of overflow runners extending from a mold cavity. The runner merging portion includes an expansion portion that spreads from each overflow runner toward the chill vent portion while maintaining a constant cross-sectional area, a rectilinear portion that goes straight from each expansion portion, and a merging portion that merges these rectilinear portions. characterized by comprising.
According to the above configuration, since the molten metal joins in front of the chill vent part, it is possible to prevent the melts from interfering with each other, and since the molten metal joins in the chill vent part, the rigidity of the molded piece obtained by solidifying the molten metal at the chill vent part. Will improve.

  According to the present invention, since the runner merging portion is provided upstream of the chill vent portion and connected to a plurality of overflow runners extending from the cavity of the mold, the molten metal merges in front of the chill vent portion, thereby preventing interference between the molten metals. In addition, since the molten metal merges in the chill vent portion, the rigidity of the molded piece obtained by solidifying the molten metal in the chill vent portion is improved. As a result, when the product is taken out from the mold, the molded piece is broken and remains in the mold, or when the cooling layer is used to quench the mold, for example, the molded piece falls to the cooling layer. Since there is nothing, it is possible to prevent a decrease in the operating rate of the mold.

  Moreover, since a runner merge part is provided with the expansion part which spreads while keeping a cross-sectional area constant toward each chill vent part from each overflow runner, it can prevent interference between molten metal. Furthermore, since the runner merging portion includes a straight portion that goes straight from each expansion portion, the molten metal from each overflow runner merges while proceeding substantially in parallel, so that it is possible to prevent the flow of molten metal from other overflow runners from being hindered. .

It is sectional drawing which shows the casting apparatus which concerns on embodiment of this invention. It is a figure which shows a movable type | mold from the mating surface side. It is a figure which expands and shows the chill vent of FIG. 2, (A) is a front view, (B) is a side view. It is a figure which shows the metal mold | die seen from the IV-IV cross section of FIG. 3 (A). It is a figure which expands and shows the runner merge part of a chill vent.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing a casting apparatus according to the present embodiment. FIG. 2 is a diagram showing a movable parting surface. In FIG. 1 and FIG. 2, the upper part of the figure is a vertically upper part, and the lower part is a vertically lower part.
The casting apparatus 1 is an apparatus that casts, for example, a high-pressure die-cast product, and generally includes a mold (casting mold) 10, an injection mechanism 30, and a chill vent 40 as shown in FIG. Yes. The mold 10 has a fixed mold 10A and a movable mold 10B, and the cavity 11 corresponding to the shape of the desired product is formed by the fixed mold 10A and the movable mold 10B facing each other. The fixed mold 10A is supported by a fixed die base 13, and the movable mold 10B is supported by a movable die base 15 driven by a driving mechanism (not shown), and moves in a forward and backward direction with respect to the fixed mold 10A.

The injection mechanism 30 includes a cylindrical injection sleeve 31 provided in the fixed mold 10A, and a plunger 33 that advances and retreats in the injection sleeve 31 by an injection drive unit (not shown) and pushes out the molten metal supplied into the injection sleeve 31. Have. The injection sleeve 31 is provided with a molten metal supply port 31 </ b> A for supplying a molten metal (for example, a metal such as aluminum) into the injection sleeve 31. The tip of the injection sleeve 31 is inserted into the fixed mold 10A, and the inside of the injection sleeve 31 and the cavity 11 of the mold 10 are inserted through the injection port 17, the runner 19 and the gate 21 formed below the cavity 11. Communicate with each other.
As shown in FIG. 2, a plurality of (three in this embodiment) overflow runners 23 are connected to the cavity 11 at the upper part of the molten metal final filling site, and the plurality of overflow runners 23 are opened to the atmosphere. The chill vent 40 is connected.

3 is an enlarged view of the chill vent 40 of FIG. 2, FIG. 3 (A) is a front view, and FIG. 3 (B) is a side view. FIG. 4 is a view showing the mold 10 as seen from the IV-IV cross section of FIG. FIG. 5 is an enlarged view showing the runner merge portion of the chill vent 40.
The chill vent 40 includes a fixed block (block) 41 provided on the mating surface PL of the fixed mold 10A and a movable block (block) 43 provided on the mating surface PL of the movable die 10B. The fixed mold block 41 is disposed in a recess 10A1 formed on the mating surface PL of the fixed mold 10A, and is fixed to the fixed mold 10A by a fixing means (not shown). The movable block 43 is disposed in a recess 10B1 formed on the mating surface PL of the movable mold 10B, and is fixed to the movable mold 10B by a fixing means (for example, a screw) not shown.

Fixed mold block 41 has convex ridges 41A that protrude from mating surface PL and extend vertically, and groove bottom 41B2 of concave ridges 41B formed between convex ridges 41A is located on the same plane as mating surface PL. ing. On the other hand, the movable block 43 has a concave portion 43B that is recessed from the mating surface PL and extends vertically, and the top 43A1 of the convex portion 43A formed between the concave portions 43B is located on the same plane as the mating surface PL. doing.
By making these fixed mold block 41 and movable mold block 43 face each other, the convex strip portion 41A and the concave strip portion 43B are engaged with each other. The meshing portion 45 between the convex strip portion 41A and the concave strip portion 43B is provided above and below the mating portion 45A, and the convex strip portion 41A. It has a wavy chill vent portion 45B that engages with the recess 43B with a gap.

  In addition, the movable block 43 is provided on the upstream side of the chill vent portion 45B, and is provided on the downstream side of the chill vent portion 45B, the upstream recess 47A communicating the overflow runner 23 and the chill vent portion 45B, and the chill vent portion 45B. A downstream recess 47 </ b> B that communicates with the hole 48 connected to the outside is formed. The chill vent 45B, the upstream recess 47A, and the downstream recess 47B constitute a gas vent passage 49 of the chill vent 40.

The upstream recess 47 </ b> A of the movable block 43 has a connection port 47 </ b> A <b> 1 that connects each overflow runner 23 at the end, and joins the plurality of overflow runners 23 in cooperation with the mating surface PL of the fixed block 41. A runner junction 50 is formed. The runner merging portion 50 joins the extended portion 51 spreading from each overflow runner 23 toward the chill vent portion 45B while maintaining a constant cross-sectional area, the rectilinear portion 53 that goes straight from each extended portion 51, and the straight advancing portions 53. And a merging portion 55.
Here, each overflow runner 23 is labeled with the overflow runners 23A to 23C and distinguished from each other, and the extended portion 51 is also labeled with the extended portions 51A to 51C corresponding to the overflow runners 23A to 23C. Shall be indicated separately.

  The central extension 51A extends at the same angles θA and θB (for example, 40 °) on both sides from the center CA of the overflow runner 23A. The upper extension 51B spreads from the center CB of the overflow runner 23 at different angles θB1 and θB2. In the present embodiment, the outer (upper) angle θB1 is set to 40 °, and the inner (lower) angle θB2 is set to 27 ° smaller than the angle θB1. The lower extended portion 51C spreads at different angles θB1 and θB2 from the center CB of the overflow runner 23C. In the present embodiment, the outer (lower) angle θC1 is set to 40 °, and the inner (upper) angle B2 is set to 27 ° smaller than the angle θB1.

Next, the operation of the present embodiment will be described.
First, the movable die base 15 is advanced, and the movable die 10B is brought into contact with the fixed die 10A to form the cavity 11. Next, the molten metal is supplied into the injection sleeve 31 from the molten metal supply port 31 </ b> A of the injection sleeve 31. Then, the plunger 33 is advanced, and the molten metal is filled into the cavity 11 through the injection port 17, the runner 19, and the gate 21. The molten metal filled in the cavity 11 flows through the overflow runner 23 and flows into the runner junction 50 of the chill vent 40. Then, the molten metal spreads while the cross-sectional area is kept constant at the expansion portion 51, travels straight at the rectilinear portion 53, merges at the confluence portion 55, reaches the chill vent portion 45B, and stops flowing.

  In this way, in the chill vent 40, the molten metal is joined before the chill vent portion 45B, so that the rigidity of the molded piece obtained by solidifying the molten metal at the chill vent portion 45B is improved. As a result, when the product is taken out from the mold 10, the molded piece is broken and remains in the mold 10. For example, when the cooling layer is used to quench the mold 10, the molded piece falls to the cooling layer. Therefore, it is possible to prevent a reduction in the operating rate of the mold 10.

In addition, since the merge portion 55 is provided in front of the chill vent portion 45B, it is possible to prevent the melts from interfering with each other as compared with the case where the merge portion of the overflow runner 23 is provided upstream of the chill vent 40 where the strength of the molten metal is relatively strong. . Moreover, since the extended part 51 which spreads while keeping a cross-sectional area constant was provided, since the molten metal from each overflow runner 23 spreads and merges, interference between molten metals can be prevented more. Furthermore, since the linearly moving portion 53 for moving the molten metal straightly is provided between the expansion portion 51 and the merging portion 55, the molten metal from each overflow runner 23 merges while proceeding substantially in parallel. This prevents the molten metal from interfering with the flow of the molten metal from the other overflow runners 23. Therefore, the occurrence of burrs in the mold 10 due to the interference of the molten metal and the increased pressure of the molten metal can be prevented.
Then, after the filling of the cavity 11 is completed and the molten metal in the cavity 11 is solidified, the movable die base 15 is operated to move the movable die 10B away from the fixed die 10A, and the product is taken out.

  As described above, according to the present embodiment, the configuration includes the runner merging portion 50 that is located upstream of the chill vent portion 45B and is connected to the plurality of overflow runners 23 extending from the cavity 11 of the mold 10. With this configuration, the molten metal joins in front of the chill vent portion 45B, so that interference between the molten metals can be prevented, and the molten metal joins in the chill vent portion 45B, so that the molten piece is solidified in the chill vent portion 45B. Stiffness is improved. As a result, when the product is taken out from the mold 10, the molded piece is broken and remains in the mold 10, or the molded piece falls to the cooling layer even when a cooling layer is used for rapid cooling, for example. Since there is no, the fall of the operation rate of the metal mold | die 10 can be prevented.

  In addition, according to the present embodiment, the runner merging portion 50 includes an extension portion 51 that spreads from each overflow runner 23 toward the chill vent portion 45B while maintaining a constant cross-sectional area, and a rectilinear portion 53 that goes straight from each extension portion 51. And a joining portion 55 that joins these rectilinear portions 53. For this reason, the expansion part 51 can prevent interference between molten metals. Moreover, since the molten metal from each overflow runner 23 merges while advancing substantially parallel by the straight advance part 53, it can prevent preventing the flow of the molten metal from the other overflow runner 23.

  However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.

1 Casting equipment 10 Mold (casting mold)
11 Cavity 23 Overflow runner 40 Chill vent 45B Chill vent section 50 Runner merge section 51 Expansion section 53 Straight section 55 Merge section

Claims (2)

In the chill vent with a chill vent part that stops the flow of molten metal,
Located upstream of the chill vent portion, comprising a runner merge portion connected to a plurality of overflow runners extending from the mold cavity ,
The runner merging section includes an expansion section that spreads from each overflow runner toward the chill vent section while maintaining a constant cross-sectional area, a rectilinear section that goes straight from each expansion section, and a merging section that merges these rectilinear sections. A chill vent characterized by that. In a casting mold with a chill vent that vents the gas in the cavity,
The chill vent is integrally provided with a chill vent portion that stops the flow of the molten metal, and a runner merging portion that is located upstream of the chill vent portion and is connected to a plurality of overflow runners extending from the cavity ,
The runner merging section includes an expansion section that spreads from each overflow runner toward the chill vent section while maintaining a constant cross-sectional area, a rectilinear section that goes straight from each expansion section, and a merging section that merges these rectilinear sections. A casting mold characterized by that.

Images