JP2003019547A - Casting method and casting mold - Google Patents

Abstract

(57) [Problem] To provide a casting method and a casting mold capable of easily manufacturing a cast product having an island portion and a bone portion in a high quality state. SOLUTION: A main body portion 11, a hollow portion 12 provided so as to penetrate the main body portion 11, an island portion 121 arranged in the hollow portion 12 so as to be separated from the main body portion 11, and an island shape portion A casting 1 having a skeleton 122 connecting the body 121 and the main body 11 is manufactured using a casting mold 2. The casting mold 2 has a main body cavity 3 for molding the main body 11.
1 and a hollow gate 321 connected to the hollow cavity 32 forming the island-shaped portion 121 and the bone portion 122. The main body gate 311 and the hollow gate 321 are connected to the runner 33 via the main body pin gate 312 and the hollow pin gate 322, respectively.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion disposed in the hollow portion and separated from the main body portion, and the island-shaped portion. The present invention relates to a casting method and a casting mold for producing a cast product having a bone portion connecting the body portion and the body portion, and particularly, the thickness of each of the body portion, the island portion and the bone portion is 1. It relates to the case of producing a thin cast product of 5 to 4 mm.

[0002]

2. Description of the Related Art Conventionally, for example, in a die casting method for manufacturing cast products used for various parts, a cavity having the same shape as the cast product is formed between a pair of molds, and a metal is placed in the cavity. The above-mentioned cast product is formed by filling the above molten metal. In this die casting method, a gate, which is an inlet of the molten metal to the cavity, and a runner for introducing the molten metal poured from the pouring portion to the gate are provided between the pair of molds. ing. Then, the molten metal is poured into the sleeve in the pouring portion, the molten metal is injected into the runner by a plunger, and the molten metal is filled from the runner through the gate into the cavity.

[0003]

However, it is difficult to manufacture a cast product having a complicated shape or a thin cast product by the above conventional casting method. For example, a hollow portion is provided so as to penetrate the main body portion, and an island-shaped portion that is arranged apart from the main body portion in the hollow portion is connected to the island-shaped portion and the main body portion. It is difficult to manufacture a part having a bone part by casting.

That is, in a cast product having such islands and skeletons, it is necessary that the molten metal flowing from the runner into the main body flows into the islands through the skeletons. However, it is not easy to send the molten metal from the main body to the bones and islands, and the molten metal is often not filled enough to cause poor casting. In addition, the problem of poor casting is not limited to the die casting method.
The same applies to general casting methods. Therefore, there is a demand for a casting method that enables easy and high-quality production of a cast product having the island-shaped portion and the bone portion.

The present invention has been made in view of the above conventional problems, and a casting method and a casting mold capable of easily producing a cast product having an island portion and a bone portion in a high quality state. Is to provide.

[0006]

According to a first aspect of the present invention, a main body portion, a hollow portion provided so as to penetrate the main body portion, and an island-shaped portion disposed in the hollow portion and separated from the main body portion. In a casting method for producing a cast product having the island-shaped portion and a bone portion connecting the main body portion with a mold having a cavity corresponding to the shape of the cast product, Connected to a main body gate connected to a main body cavity that is a portion that forms the main body portion in the cavity, and a hollow portion cavity that is a portion that forms the island-shaped portion and the bone portion in the hollow portion of the cavity The main body gate and the hollow gate are connected to a runner for introducing molten metal into them, and the molten metal sent to the runner is connected to the main body gate. Through fine the hollow section gate is in the casting method, characterized in that the filling into the cavity (claim 1).

As described above, the present invention provides a cast product having a main body portion, that is, a portion forming the outer shape of the entire cast product, and the island-shaped portion and the bone portion formed in a hollow portion penetrating in the main body portion. It is a casting method. Further, in the present invention, a mold is used in which the main body cavity and the hollow cavity are provided with respective gates of the main body gate and the hollow cavity gate, and these gates are connected to a runner.

Therefore, it is possible to easily cast a cast product having a complicated shape as described above in a state where there is no casting failure. That is, the molten metal fed into the runner is divided into the main body section gate and the hollow section gate. Then, the filling of molten metal is started from the gate of the main body to the cavity of the main body, while the filling of molten metal is started from the gate of the hollow cavity to the cavity of the hollow part. That is,
The molten metal is directly fed into the cavities of the main body cavity and the hollow cavity through the gates.

Therefore, it is possible to prevent the molten metal from being supplied to one of the cavities later than the other cavity, and it is possible to directly and quickly fill the molten metal into any of the cavities. Therefore, it is possible to prevent the casting failure due to the delayed supply of the molten metal.

As described above, according to the present invention, it is easy to fill the molten metal between the cavity of the main body and the cavity of the hollow even when the cast product having the island-shaped portion and the bone portion is manufactured. Can be matched as much as possible. Therefore, with respect to the cast product having the above-mentioned island portion and bone portion, there is almost no problem such as defective casting,
High quality castings can be easily manufactured.

According to a second aspect of the present invention, a main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion provided in the hollow portion and separated from the main body portion, and the island. A casting mold for manufacturing a cast product having a frame-shaped part and a bone part connecting the main body part, wherein the mold has a three-piece structure in which a fixed mold, an intermediate mold and a movable mold are stacked. Between the intermediate mold and the movable mold, a cavity having a main body cavity for molding the main body, a hollow cavity for molding the island-shaped portion and the bone portion in the hollow portion, A main body gate connected to the main body cavity and a hollow gate connected to the hollow cavity are provided, and between the fixed mold and the intermediate mold,
A runner for introducing molten metal into the main body gate and the hollow gate is provided, and the intermediate mold has
A main body pin gate connecting the runner and the main body gate, and a hollow pin gate connecting the runner and the hollow gate are provided, and the molten metal sent to the runner is supplied to the main body pin gate and the main body. The casting die is characterized in that the cavity is filled through the partial gate and the hollow portion pin gate and the hollow portion gate (claim 7).

The structure of the casting die of the present invention does not form the cavity, the gate and the runner between the pair of dies at the boundary portion between the pair of dies, as in the conventional case.
These are formed in a portion other than the above-mentioned boundary portion to have a three-dimensionally arranged structure. Accordingly, it is possible to form the hollow portion gate directly in the hollow portion cavity where the molten metal hardly flows, and to introduce the molten metal directly into the hollow portion cavity from the hollow portion gate. The main body pin gate and the hollow portion pin gate may be provided in order to directly introduce the molten metal into the main body cavity and the hollow portion cavity, respectively.

The structure of such a mold is as described above.
It can be realized by forming a three-sheet structure in which a fixed type, an intermediate type and a movable type are stacked. That is, the runner is provided between the fixed die and the intermediate die, and the cavity, the main body gate, and the hollow portion gate are provided between the intermediate die and the movable die. In addition, the above intermediate type,
A main body part pin gate connecting the main body part cavity and the main body part gate and a hollow part pin gate connecting the hollow part cavity and the hollow part gate are provided.

As a result, as described above, the molten metal can be directly supplied to the cavity of the main body and the cavity of the hollow portion, and the cast product or the like can be easily released even after the casting. Therefore, by using the casting mold of the present invention, it is possible to mold a cast product having the island-shaped portion and the bone portion in a high quality state without defective casting, and even after the molding. Thus, it is possible to realize a casting method in which the above cast product can be easily taken out from the casting mold.

According to a third aspect of the present invention, a main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion provided in the hollow portion and separated from the main body portion, and the island. In a casting method for producing a cast product having a skeleton portion connecting a body portion and the main body portion with a mold having a cavity corresponding to the shape of the cast product, A main body cavity that is a portion that forms the main body portion, a hollow portion cavity that is a portion that forms the island-shaped portion and the bone portion in the hollow portion of the cavity, and a hollow portion gate that is connected to the hollow portion cavity And the hollow part gate is connected to a runner for introducing molten metal into the hollow part gate, and the molten metal fed into the runner can be filled into the cavity through the hollow part gate. In casting method comprising (claim 24).

In the present invention, the molten metal fed into the runner is started to be filled into the hollow cavity from the hollow gate. Then, the molten metal that has flowed into the hollow cavity subsequently flows into the body cavity and fills the entire cavity. As described above, in the present invention, since the molten metal is introduced into the cavity through the hollow gate, problems such as defective casting into the hollow cavity can be prevented, and a high quality cast product can be manufactured. You can

In a fourth aspect of the present invention, a main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion provided in the hollow portion and separated from the main body portion, and the island. A casting mold for manufacturing a cast product having a frame-shaped part and a bone part connecting the main body part, wherein the mold has a three-piece structure in which a fixed mold, an intermediate mold and a movable mold are stacked. Between the intermediate mold and the movable mold, a cavity having a main body cavity for molding the main body, a hollow cavity for molding the island-shaped portion and the bone portion in the hollow portion, , A hollow part gate connected to the hollow part cavity is provided, and a runner for introducing molten metal into the hollow part gate is provided between the fixed mold and the intermediate mold. In addition, the runner and the hollow gate are attached to the intermediate mold. A mold for casting, characterized in that a hollow part pin gate is provided, and the molten metal fed into the runner is filled into the cavity through the hollow part pin gate and the hollow part gate. (Claim 25).

By using the casting mold, it is possible to easily realize the method of introducing the molten metal into the cavity through the hollow gate. Therefore, by using this casting mold, it is possible to easily manufacture a high-quality cast product having no defect in the hollow portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION In the first invention (Claim 1), the mold has a three-plate structure in which a fixed mold, an intermediate mold and a movable mold are stacked. The runner is provided between the intermediate die and the movable die, the cavity is provided between the intermediate die and the movable die, and the main body gate and the hollow portion gate are provided. And a main body pin gate connecting the main body gate and
A hollow part pin gate connecting the runner and the hollow part gate is provided, and the molten metal sent to the runner is connected to the main part pin gate and the main part gate,
It is preferable to fill the cavity through the hollow portion pin gate and the hollow portion gate (claim 2).

In this case, the runner, each pin gate,
Each gate and cavity can be arranged three-dimensionally. Therefore, it is possible to easily secure the supply path of the molten metal from the runner to the main body gate and the hollow portion gate. Further, after the molten metal is filled in the cavity to form a cast product, the fixed mold, the intermediate mold, and the movable mold are relatively moved to form a molded product in the cavity, the pin gate, and the runner.
The fixed mold, the intermediate mold, and the movable mold can be separated from each other and easily taken out.

Further, after the molten metal is filled, the intermediate mold and the movable mold are moved to open the space between the fixed mold and the intermediate mold, and then the movable mold is moved, The space between the intermediate die and the movable die is opened, and the runner casting formed in the runner is cut from the pin gate casting formed in the main body pin gate and the hollow portion pin gate, and the pin gate casting is formed in the intermediate die. It is preferable to further release the mold, and then release the cast product in which the pin gate casting is connected from the movable mold (claim 3).

In this case, after the cast product is molded, the fixed mold, the intermediate mold and the movable mold are sequentially moved as described above, whereby the cast product can be easily released and taken out. .

Further, between the intermediate mold and the movable mold, at least a part between the body portion pin gate and the body portion gate and at least one between the hollow portion pin gate and the hollow portion gate. And a balance runner provided in the hollow part, and at least a part of the molten metal is supplied from the main body pin gate to the main body gate through the balance runner, and at the same time, from the hollow portion pin gate through the balance runner. It is preferable to supply it to the hollow portion gate (claim 4).

By providing the balance runner, for example, the filling flow rate of the molten metal between the adjacent main body gates or between the adjacent hollow part gates is adjusted, and each part of the main body cavity or the hollow part cavity is adjusted. The molten metal can be pressure-fed to each of the parts as evenly as possible.

Further, the cast product is a front end panel for an automobile, the main body portion having a shroud, the hollow portion formed inside the shroud, and the above-mentioned disposed in the hollow portion. A cast product having a component mounting portion as an island-shaped portion and a stay supporting the component mounting portion as the skeleton can be applied (claim 5).

In this case, the island-shaped portion and the skeleton portion of the front end panel can be cast without defective casting, and the front end panel can be manufactured with high quality. Further, the front end panel can be integrally formed by casting the main body portion, the component mounting portion and the stay once. Therefore, the casting cost can be reduced.

The component mounting portion may be configured to mount a motor, a fan or a pulley (claim 6). In this case, a high quality front end panel can be manufactured by using the mounting portions for the various components of the motor, fan or pulley as the component mounting portions.

In the casting mold of the second invention (claim 7), it is preferable that at least one of the main body gate and the hollow gate is provided in plural (claim 8). In this case, in each cavity of the main body cavity or the hollow cavity, the imbalance in the distance from the main body gate or the hollow gate to the portion where the molten metal is filled can be made as uniform as possible. Therefore, the above-mentioned cavities can be filled with the molten metal in a well-balanced manner.

Further, the main body portion pin gate and / or the hollow portion pin gate is formed in a tapered shape in which a flow passage area is enlarged from the fixed die toward the movable die or from the movable die toward the fixed die. It is preferable that it is provided (Claim 9). In this case, the pin gate casting molded into the main body pin gate and the hollow portion pin gate can be easily cut at the narrowed portion having the smallest flow passage area in the main body portion pin gate or the hollow portion pin gate.

If the flow passage area is formed in a taper shape that expands from the fixed die toward the movable die, a molded product is formed in the cavity and then the intermediate die is inserted into the fixed die. Also, when the movable die is moved, the pin gate casting is caught on each of the pin gates, so that the cutting can be easily performed. Further, when the movable die is moved with respect to the intermediate die, the pin gate casting can be easily released from the intermediate die along the tapered inclined surface.

On the other hand, when the flow passage area is formed in a taper shape that expands from the movable die toward the fixed die, a molded product is formed in the cavity and then the movable die is inserted into the intermediate die. When moving, the pin gate casting catches on each pin gate, and the cutting can be easily performed. Further, when the intermediate die is moved with respect to the fixed die, the pin gate casting can be easily released from the intermediate die along the tapered inclined surface.

Further, it is preferable that the main body part pin gate and / or the hollow part pin gate is provided in a nest detachably inserted in a nest set hole provided in the intermediate mold (claim 10).

In this case, by preparing a plurality of types of inserts having different pin gate diameters and exchanging them, it is possible to adjust the flow rate of the molten metal to be pressure-fed to each pin gate. Also, by adjusting the inner diameter of the insert, the inclination angle of the tapered inclined surface can be easily changed and adjusted. Further, even when the pin gate is worn, it is possible to easily perform maintenance by replacing only the nest. Further, the nest may be manufactured by dividing it into a plurality of parts.

Further, it is preferable that the draft of at least a part of the inner wall of the cavity on the movable mold side is 1 ° or less. In this case, when the movable die is moved from the intermediate die, the casting formed in the cavity is moved to the movable die side by frictional resistance between the casting and the inner wall of the cavity on the movable die side. It can be moved while being left on the inner wall of the cavity. If the draft of all parts of the cavity exceeds 1 °, there is a risk that sufficient frictional resistance between the cast product and the inner wall of the cavity on the movable die side may not be obtained.

Further, it is preferable that the movable die is provided with a plurality of push-out pins for pushing out a cast product after being molded in the cavity from the cavity (claim 1).
2). In this case, after the cast product is formed in the cavity, the cast product can be easily taken out by moving the extrusion pin toward the intermediate die and extruding the cast product.

Further, the push-out pin may be provided so as to contact the cast product in the vicinity of the main body pin gate and / or the hollow pin gate (claim 13). In this case, when the cast product is released from the casting mold, the cast product can be released stably and smoothly.

Further, between the intermediate mold and the movable mold, at least a part between the main body unit pin gate and the main body unit gate and at least one of the hollow unit pin gate and the hollow unit gate. It is preferable to have a balance runner provided in the section (claim 14). By providing the above-mentioned balance runner, for example, the filling flow rate of the molten metal between adjacent main body gates or between adjacent hollow part gates is adjusted, and each part in the main body cavity or each part in the hollow part cavity is adjusted. The molten metal can be pumped as evenly as possible.

Further, when the balance runner is provided as described above, the movable die is provided with a plurality of push-out pins for pushing out a cast product after molding in the cavity from the cavity, and The push-out pin may be provided so as to come into contact with the balance runner in the vicinity of the position of the main body part pin gate connected to the balance runner (claim 15). In this case, when the cast product is released from the casting mold, the cast product can be released stably and smoothly.

Further, a protrusion protruding toward the direction of the intermediate mold may be provided in the vicinity of a connecting portion between the balancer runner and the main body pin gate and / or the hollow pin gate. 16).

In this case, when the movable die is moved with respect to the intermediate die after the casting is formed in the cavity, a frictional resistance is generated between the projection and the casting formed around the protrusion. Can be generated. Then, due to this frictional resistance, the movable die can be easily moved in a state where the casting is left in the movable die.

Further, a shunt element projecting toward the inlet of the main body pin gate and / or the hollow portion pin gate is provided at the movable end portion of the main body portion pin gate and / or the hollow portion pin gate. It can be provided (Claim 17).

In this case, when the flow direction of the molten metal flowing through the main body pin gate or the hollow portion pin gate is changed, the molten metal can be collided with the shunt and the conversion can be smoothly performed. In addition, when the movable die is moved with respect to the intermediate die after the casting is formed in the cavity, friction resistance may be generated between the shunt and the casting portion formed around the shunt. it can. And
Due to this frictional resistance, the movable die can be easily moved while the cast product is left in the movable die.

Further, after the filling of the molten metal is completed, the contact area between the shunt and the casting portion formed around the shunt is increased due to the formation of the shunt. for that reason,
The casting part molded around the shunt can be cooled quickly, and the movable mold can be moved to quickly take out the casting molded in the cavity.

Further, the shape of the shunt is preferably such that at least a part thereof has a draft of 1 ° or less (claim 18). In this case, when the movable die was moved from the intermediate die, a frictional resistance was easily generated between the shunt and the casting portion formed around the shunt, so that the casting was left in the movable die. In this state, the movable die can be moved more easily.

Further, it is preferable that a throttle portion having a narrowed flow passage area is provided at a portion where the main body pin gate and / or the hollow portion pin gate is connected to the runner (claim 19). In this case, when the movable die is moved with respect to the intermediate die, the body portion pin gate or the hollow portion pin gate provided with the throttle portion can be easily cut by causing stress concentration in the throttle portion. it can.

Further, it is preferable that the runner is branched into a main body runner for introducing the molten metal into the main body pin gate and a hollow portion runner for introducing the molten metal into the hollow portion pin gate (claim 20). ). In this case, since the flow path to the main body cavity and the flow path to the hollow cavity can be branched at the time of pumping the melt to the runner, it is necessary to fill the cavities with the melt in a more balanced manner. You can

Further, it is preferable that the inner diameters of the main body runner and the hollow runner are adjusted so that the flow rates of the molten metal filled therein are substantially equal (claim 21). In this case, the ease of filling the molten metal between the main body cavity and the hollow cavity can be easily adjusted, and a higher quality cast product can be manufactured.

Further, it is preferable that the hollow portion runner has a shape similar to the shape of the island portion (claim 22). That is, for example, when the island-shaped portion has a ring shape, it is preferable that the hollow portion runner has a circular curved line shape suitable for this. In this case, the hollow part gate can be easily arranged in a part corresponding to the shape of the island-shaped part of the hollow part runner, and the molten metal can be filled in a balanced manner in each part of the hollow part cavity. .

Further, it is preferable that a pressure reducing means for reducing the pressure inside the cavity is connected to the cavity (claim 23). In this case, when the molten metal is filled in the cavity, the pressure in the cavity can be positively reduced, and the molten metal can be easily filled in each part of the cavity.

Further, the cast product is a front end panel for an automobile, the main body portion having a shroud, the hollow portion formed inside the shroud, and the above-mentioned hollow portion provided in the hollow portion. A cast product having a component mounting portion as an island portion and a stay supporting the component mounting portion as the bone portion can be applied (claim 24).

In this case, the island-shaped portion and the skeleton portion of the front-end panel can be cast without defective casting, and the front-end panel can be manufactured with high quality. Further, the front end panel can be integrally formed by casting the main body portion, the component mounting portion and the stay once. Therefore, the casting cost can be reduced.

The component mounting portion may be configured to mount a motor, a fan or a pulley (claim 25). In this case, a high quality front end panel can be manufactured by using the mounting portions for the various components of the motor, fan or pulley as the component mounting portions.

[0053]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, in the casting method in this example, the main body 11, the hollow portion 12 provided so as to penetrate the main body 11, and the main body 11 in the hollow portion 12 Island-shaped portions 12 arranged apart from each other
1 and a bone part 122 connecting the island-shaped part 121 and the main body part 11 are manufactured. This casting 1
As will be described later, the manufacturing of (1) is performed using a casting mold 2 having a cavity 3 corresponding to the shape of the cast product 1. The casting method in this example is a die casting method, and the casting 1 is a die casting.

First, the casting 1 produced in this example will be described in detail. FIG. 1 is an explanatory view showing the overall structure of the cast product 1, and FIG. 2 is an explanatory diagram of a state in which a part of the cast product 1 and a cast part formed in a molten metal channel during casting are connected,
It is the figure which also showed the code | symbol in the metal mold | die 2 for casting.

As shown in FIGS. 1 and 2, the cast product 1 manufactured by the above die casting manufacturing method is a front end panel 10 which is one of the parts constituting a frame for an automobile. The front end panel 10 is a frame component for mounting a heat exchanger (radiator, condenser, etc.), a headlight, etc. in front of the automobile. The front end panel 10 is composed of a main body 11 and a hollow portion 12. The main body portion 11 includes a frame portion 101 forming the overall shape and a shroud 102 formed around the hollow portion 12. This shroud 10
2 is formed by a smooth curved surface and has a hollow portion 12
When a radiator fan is attached to the, the air sent from the fan is smoothly blown.

The hollow portion 12 has a shroud 10
It is formed inside 2. The island-shaped portion 121 in the hollow portion 12 of the present embodiment constitutes a component mounting portion for mounting the fan motor, and the bone portion 122 is the island-shaped portion 1.
A stay that supports 21 is configured. The bone portion 122 is bridged between the island portion 121 and the shroud 102, and supports the island portion 121 and a fan fixed to the island portion 121. Note that other components such as the fan and pulley may be attached to the island-shaped portion 121.

Next, the casting mold 2 will be described.
The casting mold 2 of this example is, as shown in FIG.
1, it has a three-sheet structure in which an intermediate die 22 and a movable die 23 are stacked. Then, as shown in FIGS. 2 and 3, the intermediate mold 2
2 and the movable mold 23, a main body cavity 31 for molding the main body 11 and the island-shaped portion 12 in the hollow portion 12 are formed.
1 and a cavity 3 having a hollow cavity 32 for molding the bone portion 122, a main body gate 311 connected to the main body cavity 31, and a hollow portion gate 321 connected to the hollow cavity 32 are provided. Has been.

Further, as shown in FIG.
A runner 33 for introducing molten metal into the main body gate 311 and the hollow portion gate 321 is provided between the intermediate mold 22 and the intermediate mold 22. Further, the intermediate mold 22 is provided with a main body pin gate 312 that connects the runner 33 and the main body gate 311 and a hollow portion pin gate 322 that connects the runner 33 and the hollow portion gate 321. And runner 33
It is configured to fill the molten metal sent into the cavity 3 through the body portion pin gate 312 and the body portion gate 311 and the hollow portion pin gate 322 and the hollow portion gate 321.

Further, as shown in FIG.
Between the movable mold 23 and the movable mold 23, at least a part between the main body pin gate 312 and the main body gate 311 and at least a part between the hollow part pin gate 322 and the hollow part gate 321. have.

In this example, as shown in FIG. 2, a plurality of main body gates 311 and a plurality of hollow portion gates 321 are provided respectively. The main body gate 311 connected to the central portion of the main body cavity 31 is formed in an elongated shape along the shape of the balance runner 330.
Further, as shown in FIG. 3, the main body portion pin gate 312 and the hollow portion pin gate 322 are formed in a taper shape in which the flow passage area increases from the fixed die 21 toward the movable die 23, that is, toward the cavity 3.

Further, in this example, as shown in FIG. 8, the main body pin gate 312 and the hollow portion pin gate 322 are inserted into the insert sets 221 to 223 which are detachably inserted into the insert set holes 220 provided in the intermediate mold 22. It is provided.
Specifically, a cylinder that can be inserted into the nest setting hole 220, which is a through hole having a circular cross section, has the above-mentioned nests 221 to 223.
Therefore, in this example, one divided into three is used. Each of the nests 221 to 223 is provided with a tapered through hole, and the tapered main body pin gate 312 and the hollow portion pin gate 322 are formed by connecting three through holes. .

Further, as shown in FIG. 3, the movable die 23 is provided with a plurality of push-out pins 26 for pushing out the cast product 1 molded in the cavity 3 from the cavity 3. Further, the push-out pin 26 has a pin frame 26
They are connected by 1 and are configured to move at the same time and push out the casting 1. The push-out pin 26 is provided so as to abut the balance runner 330 in the vicinity of the position of the main body pin gate 312 connected to the balance runner 330.

As shown in FIG. 9, the main body pin gate 312 or the hollow pin gate 322 is the runner 3 described above.
A narrowed portion 319 in which the flow passage area is locally greatly narrowed is provided in a portion connected to 3. In addition, as shown in FIG. 10, the wall surface of the cavity 3 is formed at the terminal end portion 302 of the main body pin gate 312 and the hollow portion pin gate 322 so as to protrude toward the inlet portion 301 of the main body portion pin gate 312 and the hollow portion pin gate 322. A shunt 239 is provided. In this example, the terminal end 302 of the main body pin gate 312 is the balance runner 330.
It is a connection part 303 connected to the shunt 23.
9 is formed on this connecting portion 303. Further, the shunt 239 is formed on the side of the movable die 33 in the cavity 3 and is also a protrusion protruding toward the intermediate die 32.

Further, in this example, in order to improve the mold release property, which will be described later, at least a part of the draft of the inner wall of the cavity 3 on the movable die 23 side, that is, the side wall of the cavity 3 becomes the intermediate die 22. The angle to expand is 1
It is set below °. Further, the draft of the shunt 239 is also set to 1 ° or less.

Further, in this example, as shown in FIG. 2, the runner 33 includes a main body part runner 331 for introducing the molten metal into the main body part pin gate 312 and a hollow part pin gate 322.
It is branched into a hollow runner 332 for introducing molten metal into. The inner diameters of the main body runner 331 and the hollow runner 332 are adjusted so that the flow rates of the molten metal filled therein are substantially equal. Then, as shown in the figure, the hollow part runner 332 was provided in a shape similar to the shape of the island-shaped part 121. Specifically, the island portion 121
Since it has a ring shape, it was provided in an arcuate curved shape.

As shown in FIG. 3, the fixed mold 21 has
A pouring portion 34 connected to the runner 33 is provided.
The pouring part 34 is a pouring port 343 for pouring the molten metal.
Injection sleeve 342 having a
And an injection plunger 341 for sending the molten metal poured under pressure to the runner 33.

Further, as shown in the figure, the movable mold 23 is provided with a gas vent passage 35 for discharging the gas in the cavity 3 to the outside of the casting mold 2. Then, in the middle of the gas vent path 35, the cavity 3
There is provided a decompression means 4 for decompressing the inside of the cavity 3 by sucking the gas inside.

The depressurizing means 4 has a vacuum pump 41 and a vacuum tank 42. Then, the molten metal is poured into the pouring port 343 of the pouring section 34, the vacuum pump 41 is operated to evacuate the cavity 3, and the pressure in the cavity 3 is made negative. Then, the molten metal is injected into the runner 33 by the plunger 341 to fill the cavity 3. The above vacuum pump 4
The vacuum evacuation by 1 may be performed while the injection by the plunger 341 is being performed. Further, the depressurizing means 4 may be configured to have a chill vent.

Further, the gas vent passage 35 has a cutoff pin 36 for preventing an excessive amount of the molten metal from flowing into the gas vent passage 35 after the cavity 3 is filled with the molten metal. It is provided. And
A vacuum gauge 49 for measuring the degree of vacuum in the cavity 3 is disposed in the passage of the cutoff pin 36.

Further, in the casting mold 2, the three fixed molds, the intermediate mold 22 and the movable mold 23 are arranged between a pair of base plates 24. In addition, the movable mold 23
A space 25 is provided between the movable plate 23 and the base plate 24 located on the side so that the pin frame 261 of the push-out pin 26 can be arranged.

In manufacturing the casting 1 using the casting mold 2, first, in the state shown in FIGS. 3 and 4, the pouring port 34 of the injection sleeve 342 of the pouring section 34 is poured.
The molten metal is poured from 3 and this molten metal is injected into the injection plunger 34.
1 is injected into the runner 33. In this example, the runner 33 is divided into the main body section runner 331 and the hollow section runner 332 as described above (see FIG. 2), and the molten metal branches and flows.

Then, the molten metal injected into the main body runner 331 is sent under pressure to the respective main body pin gates 312. At this time, the molten metal flowing through the main body pin gates 312 is divided into the shunts 239 formed at the end portions 302 thereof.
(See FIG. 10), the flow directions are dispersed into the flow flowing to each main body gate 311 and the flow flowing to the balance runner 330. Then, the molten metal flows into the main body cavity 31 from the main body gate 311 and
Further, it also flows into the adjacent main body portion gate 311 via the balance runner 330.

On the other hand, the molten metal injected into the hollow portion runner 332 is sent under pressure to the hollow portion pin gates 322. At this time, the molten metal flowing through each hollow portion pin gate 322 is separated from the shunt 239 formed at the end portion 302 thereof.
Flow is distributed to the balance runner 330 that branches into a plurality of branches. Then, the molten metal flows into the hollow cavity 32 from each balance runner 330 through each hollow gate 321.

The molten metal that has flowed into the main body cavity 31 from each of the main body gates 311 preferentially fills the main body cavity 31, while the molten metal that has flowed into the hollow cavity 32 from each hollow gate 321. Is
The hollow cavity 32 is preferentially filled. Then, these melts join and join in the main body cavity 31 or the hollow cavity 32 to fill the entire cavity 3.

In this way, the cast product 1 having the shape of the front end panel 10 is formed in the cavity 3. In addition, this runner 33 has this runner 3
The runner casting 15 having the shape of 3 is formed, and the pin gate casting 16 having the above shapes is formed on the main body portion pin gate 312 and the hollow portion pin gate 322. The balance runner 330 is molded with the balance runner casting 17.

As shown in FIG. 5, after the cast product 1 is molded, the intermediate mold 22 is fixed to the fixed mold 21.
The movable die 23 is moved to open the space between the fixed die 21 and the intermediate die 22. At this time, the fixed mold 21 and the intermediate mold 22
The runner casting 15 formed on the runner 33 between the intermediate die 22 and the movable die 23 remains connected to the main body pin gate 312 and the hollow gate pin gate 322 formed on the intermediate die 22. Moving.

Then, as shown in FIG.
The movable die 23 is moved with respect to 2, and the space between the intermediate die 22 and the movable die 23 is opened. At this time, the above runner casting 1
5 is caught by the intermediate mold 22, cut from the pin gate casting 16, and separated from the pin gate casting 16. Then, the pin gate casting 16 is released from the intermediate die 22.

When the movable mold 23 is moved, the runner casting 15 and the pin gate casting 16 are easily cut. That is, the throttle portion 319 (see FIG. 9) formed on the body portion pin gate 312 and the hollow portion pin gate 322 (see FIG. 9).
The presence of (see) facilitates stress concentration and facilitates cutting. Also, the above-mentioned pin gates 312, 3
22 is formed in a tapered shape in which the flow passage area increases toward the cavity 3 as described above. Therefore, the mold release of the pin gate casting 16 can be smoothly performed.

Next, as shown in FIG. 7, the push-out pin 26 arranged corresponding to the position of the main body pin gate 312 is moved toward the direction in which the intermediate die 22 is located with respect to the movable die 23. . At this time, the casting 1 in which the pin gate casting 16 is still connected is extruded from the cavity 3, and the casting 1 can be released from the movable die 23. After that, unnecessary parts such as the pin gate casting 16 and the balance runner casting 17 are removed from the casting 1 to obtain the final casting 1.

As shown in FIG. 11, the main body part pin gate 312 and the hollow part pin gate 322 may be formed in a tapered shape in which the flow passage area increases from the movable mold 23 toward the fixed mold 21. Good. In this case, when the movable die 23 is moved with respect to the intermediate die 22,
The pin gate casting 16 in the state where the runner casting 15 is connected is cut from the casting 1.

Next, the function and effect of this example will be described. As described above, in the present example, the main body cavity 31 and the hollow cavity 32 are provided with the respective gates of the main body gate 311 and the hollow cavity gate 321, and these gates are respectively connected to the main body pin gate 312 and the hollow cavity pin gate. The casting mold 2 connected to the runner 33 via 322 is used. Therefore, the front end panel 10 for an automobile, which is the cast product 1 having the complicated shape as described above, can be easily cast without any casting failure.

That is, the molten metal fed into the runner 33 is finally divided into each body portion gate 311 and each hollow portion gate 321. Then, the filling of the molten metal is started from each of the main body gates 311 to the main body cavity 31, while the filling of the molten metal is started from each hollow portion gate 321 to the hollow cavity 32. That is, the molten metal is directly fed into each of the main body cavity 31 and the hollow cavity 32 through the gates 311 and 321.

Therefore, it is possible to prevent the molten metal from being supplied to one of the cavities later than the other cavity, and it is possible to directly and quickly fill the molten metal into either of the cavities 31 and 32. . Therefore, it is possible to prevent the casting failure due to the delayed supply of the molten metal.

Further, such an excellent die casting method adopts the casting die 2 having the above-mentioned three-piece structure, and the cavity 3, each gate 311, 321 and each pin gate 31
It is realized by arranging 2, 322 and the runner 33 three-dimensionally. By using this casting mold 2, the molten metal can be directly supplied to the main body cavity 31 and the hollow cavity 32 as described above, and the cast product 1 can be easily released even after casting. It can be done.

Further, in this example, the island portion 121 and the skeleton portion 122 of the front end panel 10 can also be cast without defective casting, and the front end panel 10
Can be manufactured with high quality. In addition, the front end panel 10 includes the main body portion 11 and the island portion 1 as described above.
The component mounting portion 21 and the stay 122 as the skeleton 122 can be integrally formed by one casting. Therefore, the casting cost can be reduced.

In the above embodiment, the cast product 1 which is the product to which the present invention is applied is the front end panel 1.
In addition to the above, the island-shaped portion 12 is also included in the cast product 1
1 can be applied to various products having a shape including the bone portion 122 and the bone portion 122. Further, in the above embodiment, the method of filling the cavity 3 with the molten metal through the body portion gate 311 and the hollow portion gate 321 and the casting mold 2 used therefor.
About. On the other hand, in manufacturing the cast product 1, it is also possible to apply a method of filling the cavity 3 with the molten metal only from the hollow part gate 321 by using the casting mold 2 provided with only the hollow part gate 321.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the overall structure of a cast product in an example.

FIG. 2 is an explanatory view showing a state in which a part of a cast product and a cast part formed in a molten metal channel during casting are connected in the embodiment.

FIG. 3 is an explanatory view showing the structure of a casting mold in the example.

FIG. 4 is an explanatory view showing a state where the casting mold is filled with the molten metal in the embodiment.

FIG. 5 is an explanatory view showing a state in which a fixed die and an intermediate die of the casting die are opened in the embodiment.

FIG. 6 is an explanatory view showing a state in which a space between the intermediate die and the movable die of the casting die is opened in the embodiment.

FIG. 7 is an explanatory view showing a state in which the cast product is released from the cavity in the embodiment.

FIG. 8 is an explanatory view showing structures of a main body pin gate and a hollow pin gate in the embodiment.

FIG. 9 is an explanatory view showing a narrowed portion of the main body pin gate and the hollow portion pin gate in the embodiment.

FIG. 10 is an explanatory diagram showing shunts provided at the ends of the main body pin gate and the hollow portion pin gate in the embodiment.

FIG. 11 is an explanatory view showing a casting mold in which the main body part pin gate and the hollow part pin gate are formed in a tapered shape in which the flow passage area increases from the movable mold to the fixed mold in the embodiment.

[Explanation of symbols]

1. ． ． Castings, 10. ． ． Front end panel, 11. ． ． Body part, 12. ． ． Hollow part, 121. ． ． Island, 122. ． ． Bone part, 2. ． ． Casting mold, 21. ． ． Fixed type, 22. ． ． Intermediate type, 23. ． ． Movable, 26. ． ． Extrusion pin, 3. ． ． cavity, 31. ． ． Body cavity, 311. ． ． Main body gate, 312. ． ． Main body pin gate, 32. ． ． Hollow cavity, 321. ． ． Hollow gate, 322. ． ． Hollow pin gate, 33. ． ． runner, 330. ． ． Balance runner, 34. ． ． Pouring part, 4. ． ． Decompression means,

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B22C 9/08 B22C 9/08 BE 9/20 9/20 B22D 17/00 B22D 17/00 B (72 ) Inventor Tomoyuki Hatano 1-chome, Showa-cho, Kariya city, Aichi stock company denso (72) Inventor Hiroki Takagi 1-1-chome, Showa-cho, Kariya city, Aichi stock company denso (72) Inventor, Ikuo Ozawa Aichi 1-chome, Showa-machi, Kariya city, prefecture DENSO CO., LTD. (72) Inventor Yasushi Hibi 1-1-chome, Showa-machi, Kariya city, Aichi prefecture DENSO (72) Inventor Minoru Furuhata Nikawa-cho, Toyohashi city, Aichi prefecture 80 Higashimukaiyama, Kyoto Die Casting Industry Co., Ltd. (72) Inventor, Koji Tsuboe Futagawa, Toyohashi, Aichi 80 Higashimukaiyama F, Kyoto Die Casting Industry Co., Ltd. Over-time (reference) 4E093 NB03 PA02 PA03 SA02 UC10

Claims (27)

[Claims] 1. A main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion disposed in the hollow portion and separated from the main body portion, the island-shaped portion and the In a casting method for producing a cast product having a bone part connecting with a main body part using a mold having a cavity corresponding to the shape of the cast product, the main part in the cavity is provided in the mold. A main body gate connected to a main body cavity that is a molding portion, and a hollow gate connected to a hollow cavity that is a portion that molds the island-shaped portion and the bone portion in the hollow portion of the cavity. The main body gate and the hollow portion gate are connected to a runner for introducing molten metal into them, and the melt fed into the runner is supplied to the main body gate and the hollow portion gate. A casting method, characterized in that the cavity is filled via 2. The mold according to claim 1, wherein the mold has a three-plate structure in which a fixed mold, an intermediate mold and a movable mold are stacked, and the runner is provided between the fixed mold and the intermediate mold. However, the cavity is provided between the intermediate mold and the movable mold, and the main body gate and the hollow gate are provided. The intermediate mold has a main body connecting the runner and the main body gate. A pin pin gate and a hollow pin gate connecting the runner and the hollow gate are provided, and the molten metal fed into the runner is melted into the body pin gate and the body gate, and the hollow pin gate and the hollow gate. A casting method, characterized in that the cavity is filled through a partial gate. 3. The method according to claim 2, wherein after the molten metal is filled, the intermediate die and the movable die are moved,
The space between the fixed mold and the intermediate mold is opened, and then the movable mold is moved to open the space between the intermediate mold and the movable mold, and the runner casting formed on the runner is fixed to the main body pin gate. And cutting from the pin gate casting formed in the hollow portion pin gate, releasing the pin gate casting from the intermediate die, and then releasing the casting with the pin gate casting connected from the movable die. Characteristic casting method. 4. The at least part between the main body pin gate and the main body gate, and the hollow pin pin gate and the hollow portion between the intermediate mold and the movable mold according to claim 2 or 3. A balance runner provided at least at a part between the gate and the gate, and at least a part of the molten metal is supplied to the main body gate from the main body pin gate through the balance runner and the hollow portion. A casting method comprising supplying the hollow portion gate from the pin gate through the balance runner. 5. The method according to any one of claims 1 to 4,
The cast product is a front end panel for an automobile, and has a main body portion having a shroud, the hollow portion formed inside the shroud, and a component as the island-shaped portion disposed in the hollow portion. A casting method comprising a mounting portion and a stay that supports the component mounting portion as the bone portion. 6. The component mounting portion according to claim 5,
A casting method characterized in that a motor, a fan or a pulley is attached. 7. A main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion disposed inside the hollow portion and separated from the main body portion, the island-shaped portion and the A casting mold for manufacturing a cast product having a bone part connecting to a main body part, wherein the mold has a three-plate structure in which a fixed mold, an intermediate mold and a movable mold are stacked. Between the intermediate mold and the movable mold, a cavity having a main body cavity for molding the main body portion, a hollow cavity for molding the island-shaped portion and the bone portion in the hollow portion, and the main body portion. A main body gate connected to the cavity and a hollow gate connected to the hollow cavity are provided, and the main body gate and the hollow gate are provided between the fixed mold and the intermediate mold. There is a runner for introducing molten metal to the gate On the other hand, the intermediate die is provided with a main body pin gate connecting the runner and the main body gate, and a hollow pin gate connecting the runner and the hollow gate, and the molten metal fed into the runner is provided. A mold for casting, which is configured to be filled into the cavity through the body portion pin gate and the body portion gate, and the hollow portion pin gate and the hollow portion gate. 8. The casting mold according to claim 7, wherein at least one of the main body gate and the hollow gate is provided in plural. 9. The flow path area according to claim 7 or 8, wherein the main body portion pin gate and / or the hollow portion pin gate extends from the fixed die toward the movable die or from the movable die toward the fixed die. Is formed in a tapered shape that expands. 10. The body pin gate and / or the hollow pin gate according to any one of claims 7 to 9, wherein the main body pin gate and / or the hollow portion pin gate is provided in a nest detachably inserted in a nest set hole provided in the intermediate mold. A casting mold characterized by being used. 11. The casting mold according to claim 7, wherein at least a part of the inner wall of the cavity on the movable mold side has a draft of 1 ° or less. 12. The casting according to any one of claims 7 to 11, wherein the movable die is provided with a plurality of push-out pins for pushing out a cast product after molding in the cavity from the cavity. Mold for. 13. The casting mold according to claim 12, wherein the push-out pin is provided in the vicinity of the main body pin gate and / or the hollow portion pin gate so as to come into contact with the cast product. . 14. The hollow portion according to claim 7, wherein at least a part between the body portion pin gate and the body portion gate and the hollow portion are provided between the intermediate die and the movable die. A casting mold having a balance runner provided at least at a part between the pin gate and the hollow gate. 15. The movable die according to claim 14, wherein the movable die is provided with a plurality of extruding pins for extruding a cast product formed in the cavity from the cavity, and the extruding pins are connected to the balance runner. A die for casting, which is provided so as to abut the balance runner in the vicinity of the position of the main body pin gate that is formed. 16. The protrusion according to claim 15, wherein a protrusion protruding toward the direction of the intermediate mold is provided in the vicinity of a connecting portion between the balancer runner and the main body pin gate and / or the hollow portion pin gate. A mold for casting characterized in that 17. The body part pin gate and / or the hollow part pin gate according to any one of claims 7 to 16, wherein the body part pin gate and / or the hollow part A casting mold characterized in that a shunt element projecting toward the entrance of the pin gate is provided. 18. The casting mold according to claim 17, wherein the shape of the shunt is such that at least a part thereof has a draft angle of 1 ° or less. 19. The throttling portion having a narrowed flow passage area is provided in a portion where the main body pin gate and / or the hollow portion pin gate is connected to the runner according to any one of claims 7 to 18. A casting mold characterized by being 20. The main body part runner for introducing the molten metal into the main body part pin gate, and the hollow part runner for introducing the molten metal into the hollow part pin gate according to any one of claims 7 to 19. A casting mold characterized in that it is branched into. 21. The casting according to claim 20, wherein the inner diameters of the main body runner and the hollow runner are adjusted so that the flow rates of the molten metal filled therein are substantially equal to each other. Mold. 22. The casting mold according to claim 20 or 21, wherein the hollow portion runner has a shape similar to the shape of the island portion. 23. The casting mold according to claim 7, wherein a depressurizing means for depressurizing the inside of the cavity is connected to the cavity. 24. The cast product according to any one of claims 7 to 23, which is a front end panel for an automobile, the main body having a shroud, and the hollow portion formed inside the shroud. And a stay for supporting the component mounting portion as the island portion, and a stay for supporting the component mounting portion disposed in the hollow portion. 25. The casting mold according to claim 24, wherein the component mounting portion is configured to mount a motor, a fan or a pulley. 26. A main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion provided in the hollow portion and spaced from the main body portion, the island-shaped portion and the In a casting method for producing a cast product having a bone part connecting to a main body part using a mold having a cavity corresponding to the shape of the cast product, the mold molds the main body part in the cavity. The main body cavity that is the part to be
The hollow part has a hollow part cavity which is a part for molding the island part and the bone part in the hollow part of the cavity, and a hollow part gate connected to the hollow part cavity, and the hollow part gate. Is connected to a runner for introducing molten metal therein, and the molten metal fed into the runner is filled into the cavity through the hollow gate. 27. A main body portion, a hollow portion provided so as to penetrate the main body portion, an island-shaped portion disposed in the hollow portion and separated from the main body portion, the island-shaped portion and the A casting mold for manufacturing a cast product having a bone part connecting to a main body part, wherein the mold has a three-plate structure in which a fixed mold, an intermediate mold and a movable mold are stacked. Between the intermediate mold and the movable mold, a cavity having a main body cavity for molding the main body portion, a hollow cavity for molding the island-shaped portion and the bone portion in the hollow portion, and the hollow portion. A hollow portion gate connected to the cavity is provided, and a runner for introducing molten metal into the hollow portion gate is provided between the fixed die and the intermediate die, and the intermediate die is provided. The mold has a hollow part connecting the runner and the hollow part gate. A casting die, which is provided with a gate, and is configured to fill the cavity with the molten metal fed into the runner through the hollow pin gate and the hollow gate.