JPH09225620A - Mold equipment - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a die device capable of easily narrowing the diameter of the sprue part 31 after the pouring, with the spout 31 having a large opening. A fixed mold (26) and a movable mold (20) that can move forward and backward with respect to the fixed mold (26) are provided, and when the movable mold (20) is matched with the fixed mold (26). The cavity 28 for molding the product A is formed and
In a mold device that forms a sprue part 31 for pouring the molten metal into the spout 28 and presses molten metal into the spout part 31, the cavity 28 is provided in either one of the fixed mold 26 and the movable mold 20. Further, there is provided a sprue adjuster 38 having an insert 43 protruding into the sprue part 31 after being filled with the molten metal. The gate adjusting means 38 is composed of a hydraulic cylinder 39 having an insert 43 for cutting the molten metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus, and more particularly to die casting with local pressure.

[0002]

2. Description of the Related Art Conventionally, as a mold apparatus of this type, for example, as shown in FIG. 3, a cavity 3 is formed by a fixed mold 1 and a movable mold 2, and the cavity 3 is located at the lower end of the cavity 3. A narrow sprue portion 6 communicating with the cavity 3 is formed by the convex mold 4 protruding from the fixed mold 1 toward the movable mold 2 and the convex mold 5 protruding from the movable mold 2 toward the fixed mold 1. The fixed die 1 is provided with an injection plunger 7 for pushing and retracting the molten metal to the narrow sprue portion 6, and the movable die 2 is provided with a molten metal filled in the cavity 3 through a guide 8. There is a configuration in which a pressurizing cylinder 10 having a pressurizing plunger 9 that pressurizes and retracts is provided.

[0003]

In the structure shown in FIG. 3, since the sprue part 6 communicating with the cavity 3 is formed to be narrow, the sprue pressed by the injection plunger 7 comes from the sprue part 6. Since the molten metal is poured into the cavity 3 in a turbulent state in which gas (air) is ejected in the form of a spray, cavities are likely to occur, and after filling the cavity 3 with molten metal, the pressure plunger 9 and the like are filled. It is necessary to pressurize the molten metal in the cavity 3 to remove the cause of the generation of the porosity. Further, since the sprue part 6 is narrow, the pouring speed into the cavity 3 is increased, gas is easily entrained, and further, the riser is easily solidified in the sprue part 6 and the effect of the riser is insufficient.

Therefore, the sprue portion 6 communicating with the cavity 3
When the opening is made large, the riser pressed by the injection plunger 7 does not involve gas (air) and the cavity 3
Since the molten metal is poured inside, the problems of the generation of the porosity and the solidification of the riser at the sprue part 6 can be solved, but on the other hand, in the product A after casting, the sprue solidified at the spout part 6 having a large opening Since the protrusions are integrally formed, this large sprue protrusion cannot be easily cut and removed from the product A, which is troublesome.
There is a problem that it is not preferable in terms of cost reduction.

The present invention has been made in view of the above circumstances, and provides a die apparatus capable of easily narrowing the diameter of the sprue part after the pouring, with the spout part having a large opening. It is intended to be provided.

[0006]

A mold apparatus according to claim 1 has a fixed mold and a movable mold which can be moved forward and backward with respect to the fixed mold, and the fixed mold. In the mold device for forming a cavity for molding a product when the movable molds are matched with each other, forming a sprue part for pouring the molten metal into the cavity, and pressing the molten metal into the spout part, One of the fixed mold and the movable mold is provided with a sprue adjusting means having an insert projecting into the spout after the molten metal is filled in the cavity.

When the molten metal is pushed in a state in which the gate of the gate adjusting means is retracted and the diameter of the gate is wide open, the riser releases gas (air) from the wide opening gate. It is poured into the cavity smoothly without getting caught. Further, since the sprue part is largely opened, it is possible to prevent the riser from solidifying early in the sprue part.

Further, when the insert of the sprue adjusting means is projected into the sprue part after the molten metal is filled in the cavity, the diameter of the sprue part is narrowed by this insert, so that the cavity is formed in the spout part. A thin continuous portion is integrally formed with the product to be molded therein, and the sprue protrusion is integrally solidified on the product through the thin continuous portion. Then, the sprue protrusion is easily cut and removed from the product by the thin continuous portion.

The mold apparatus according to a second aspect is the mold apparatus according to the first aspect, wherein the gate adjusting means is a hydraulic cylinder having an insertable / retractable insert that projects into the gate and cuts the molten metal. It will be. The hydraulic cylinder projects the insert into the molten metal in the sprue part, whereby the molten metal in the sprue part is cut by the insert and the diameter of the sprue part is easily narrowed.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 20 denotes a movable mold which is provided so as to be movable back and forth with respect to a fixed mold which will be described later.
The male mold 21 is provided so as to project toward the front at a substantially intermediate portion in the vertical direction thereof, and a mold matching surface 22 in the vertical direction is formed in series on the upper end of the base end of the male mold 21. A vertical sprue face 23 is formed in series on the lower part of the base end of the mold 21. Further, a trapezoidal protruding die 24 is provided at the lower end of the sprue forming surface 23 so as to project forward, and a vertical mating surface 25 is formed in series under the base end of the protruding die 24. There is.

Next, 26 is a fixed mold, and this fixed mold 26
A female die 27 for accommodating the male die 21 is recessed forward in a substantially middle portion of the vertical direction. Then, by the male mold 21 of the movable mold 20 and the female mold 27 of the fixed mold 26,
The cavity 28 is configured at the time of mold matching.

Further, a vertical mold matching surface 29 to be matched with the upper mold matching surface 22 of the movable mold 20 is formed in series at the upper end of the female mold 27. At the lower end of 27, a gate forming surface 30 is formed in series in the up-down direction so as to face the gate forming surface 23. Further, the gate forming surface 23 of the movable mold 20 and the gate forming surface 30 of the fixed mold 26 constitute a gate part 31 that communicates with the cavity 28 and pours the molten metal during mold matching. There is.

At the lower end of the sprue forming surface 30, there is formed a riser portion 32 in the front-rear direction for accommodating the protruding die 24 of the movable mold 20. The projecting mold 24 of the movable mold 20 and the riser unit 32 of the fixed mold 26 form a melt passage 33 communicating with the sprue unit 31 during mold matching.

Further, at the lower end portion of the feeder unit 32, a vertical mold matching surface 34 to be matched with the lower mold matching surface 25 of the movable mold 20 is formed in series. Further, a feeder unit 35 is provided in the feeder unit 32 of the fixed mold 26 so as to be able to move back and forth toward the projecting mold 24. The feeder means 35 has a plunger 36 that can move back and forth in the front-back direction.
A plunger tip 37 is integrally formed at the tip of 36 along the inner wall surface of the feeder 32 so as to advance and retract in a liquid-tight state. Then, the plunger tip 37 pushes the molten metal from the projecting die 24 toward the molten metal passage 33.

Further, a gate adjusting means 38 which is located above the feeder means 35 and which narrows the diameter of the gate 31 is provided on the fixed mold 26 so as to be capable of advancing and retracting toward the gate 31. ing. The gate adjusting means 38 is composed of a hydraulic cylinder 39, and a guide hole 41 in the front-rear direction formed in communication with a cylinder chamber 40 of the hydraulic cylinder 39 is opened in the gate forming surface 30.

In addition, the plunge 42, which is provided in the cylinder chamber 40 so as to be able to move forward and backward, is provided with an insert 43 for entering the hot water in the sprue part 31 to narrow the diameter of the sprue part 31 or to cut and separate it. A rod 44 provided at the tip is provided so as to be able to move back and forth in the front-rear direction. The insert 43 is formed in a taper shape which gradually becomes thinner toward the tip.

During casting, the rod 44 is retracted so that the tip of the insert 43 constitutes a part of the sprue forming surface 30. After the casting, the insert 43 is advanced by the rod 44. Then, enter the hot water in the sprue part 31 and
The diameter of 31 is narrowed or cut and separated.

Next, the operation of the above embodiment will be described.

When the movable mold 20 is fitted to the fixed mold 26, the mold matching surface 22 of the movable mold 20 is liquid-tightly adhered to the mold matching surface 29 of the fixed mold 26, and the mold matching is performed. The mold matching surface 25 of the movable mold 20 is liquid-tightly adhered to the mold matching surface 34 of the fixed mold 26 for mold matching, and the lower surface of the protruding mold 24 of the movable mold 20 is fixed to the fixed mold 26. The mold is fitted to the end of the feeder 32 in a liquid-tight manner.

Then, the male mold 21 and the fixed mold 26 of the movable mold 20.
A cavity 28 for molding a product is constituted by the female die 27, and the sprue forming surface 23 of the movable die 20 and the fixed die 26 are formed.
The gate part 31 communicating with the cavity 28 is constituted by the gate forming surface 30 of the hot water, and the hot water communicating with the gate part 31 by the projecting mold 24 of the movable mold 20 and the feeder part 32 of the fixed mold 26. Road 33
Is configured.

Further, the sprue adjusting means 38, that is, the plunger 42 of the hydraulic cylinder 39 retracts the cutting insert 43 through the rod 44, and the tip of the cutting insert 43 is fixed to the fixed mold 26. By positioning it on the same plane as the sprue forming surface 30, the tip of the insert 43 constitutes a part of the sprue forming surface 30, and the insert 43 allows the spout 31 to have a large diameter.

Next, in a state where the molten metal is supplied into the feeder portion 32 of the fixed mold 26, the feeder tip 35, that is, the plunger 36, advances the plunger tip 37 toward the projecting die 24. , Plunger part with this plunger tip 37
The molten metal in 32 is pushed. Then, this molten metal is pushed from the runner 33 to the sprue section 31, and this riser
Is poured into the cavity 28.

At this time, since the sprue part 31 is largely opened, the riser is not sprayed in a spray form.
The gas (air) is smoothly poured into the cavity 28 from 31 and the required amount of riser is filled in the cavity 28 relatively quickly. Therefore, when the molten metal is poured from the sprue part 31 into the cavity 28, there is no room for causing a porosity to be poured. Further, since the sprue part 31 is largely opened, the riser is prevented from solidifying early in the sprue part 31.

Next, the plunger of the hydraulic cylinder 39
By advancing the insert 43 through the rod 44 at 42, the insert 43 moves from the gate forming surface 30 of the fixed mold 26 toward the gate forming surface 23 of the movable mold 20 in the gate 31. While cutting, it is entered to a predetermined position.

The diameter of the sprue part 31 is narrowed and narrowed by the insert 43, so that the product A molded in the cavity 28 is molded with the narrowed sprue part 31. The sprue protrusion C is integrally solidified through the thin continuous portion B.

The insert 43 is the gate forming surface 30 of the fixed mold 26.
When the hot water in the sprue part 31 is cut into the sprue forming surface 23 of the movable mold 20 until it abuts,
At, the hot water in the sprue part 31 is completely cut off, so that the product A and the sprue protrusion C are solidified separately in a separated state.

Next, the movable mold 20 is retracted to a fixed mold.
While releasing from 26 and releasing, the male mold 21 of the movable mold 20
Then, the product A in which the sprue protrusion C is continuously connected at the thin continuous portion B is taken out from the protrusion 24. At this time, the product A has a thin continuous portion B
Since the sprue protrusion C is integrally connected via the, the product A and the spout protrusion C can be easily taken out from the movable mold 20.

The sprue protrusion C is easily cut and removed from the product A at the thin continuous portion B. That is, since the continuous portion B is thinly formed at the sprue portion 31 whose diameter is flat and thin, the thin continuous portion B is tapped, so that the spout portion C from the product A to the product A is tapped. Is easily cut and removed.

Next, in the above-described embodiment, the case where the sprue adjusting means 38 is provided on the fixed mold 26 so as to be movable back and forth has been described, but the invention is not limited to this, and the sprue adjusting means 38 can be moved forward and backward on the movable mold 20. It may be provided.

[0031]

According to the invention of claim 1, a fixed mold is provided,
A movable mold provided so as to be movable back and forth with respect to this fixed mold, and forming a cavity for molding a product when the movable mold is fitted to the fixed mold, and in the cavity In a die device for forming a spout for pouring molten metal into the spout, the molten metal is filled in the cavity in one of the fixed die and the movable die. Since the sprue adjuster having the insert protruding into the sprue part is provided, it is possible to perform the pouring with the sprue adjuster having a large opening at the sprue adjuster when pouring. A means to remove the cause of the porosity generation by pressurizing the molten metal in the cavity after pouring the molten metal into the cavity without pouring or casting holes in the cavity in a turbulent state I need , Its configuration is simple.

Further, after the casting, the insert of the sprue adjusting means is projected into the sprue part, so that the spout can easily narrow the diameter of the sprue part. The sprue protrusion can be thinly solidified into a flat shape,
When removing the sprue protrusion from the product, the sprue protrusion can be easily removed from the thin flat portion.

Therefore, it is possible to provide a mold apparatus which can cast a product which is easy to cast and which is unlikely to cause a porosity, and which can be easily post-processed to reduce the cost.

According to the second aspect of the present invention, since the sprue adjusting means is composed of a hydraulic cylinder having an insertable / retractable insert that projects into the spout and cuts the molten metal, the insert of the hydraulic cylinder is inserted into the spout after casting. By projecting the molten metal in the sprue part, the diameter of the sprue part can be easily narrowed, and by retracting the insert,
The diameter of the sprue part can be easily expanded to the maximum to prepare for pouring.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a pouring state in which a casting apparatus showing an embodiment of the present invention is matched with each other.

FIG. 2 is a cross-sectional view of the casting apparatus showing a state in which the diameter of the sprue part is narrowed after casting.

FIG. 3 is a sectional view showing an example of a conventional casting apparatus.

[Explanation of symbols]

 20 Movable mold 26 Fixed mold 28 Cavity 31 Gate part 35 Feeding means 38 Gate means 39 Hydraulic cylinder 43 Nesting A Product

Claims (2)

[Claims] 1. A fixed mold and a movable mold which is provided so as to be movable back and forth with respect to the fixed mold, and a product is molded when the movable mold is fitted to the fixed mold. In a die device for forming a cavity, forming a spout for pouring molten metal into the cavity, and pouring molten metal to the spout, the fixed die and the movable die are provided with the A mold apparatus, wherein a cavity is provided with a sprue adjuster having an insert projecting into the spout after filling the melted metal. 2. The mold apparatus according to claim 1, wherein the gate adjusting means comprises a hydraulic cylinder having an insertable / retractable insert which projects into the gate and cuts the molten metal.