JPH08276259A - Forming device and forming method - Google Patents

Abstract

PURPOSE: To attain quick an sure separation of a formed product from a die and to improve the efficiency of equipment and the workability of a die casting operation by executing only comparatively simple driving while stopping the three-dimensional driving of a core and utilizing the other easy accompanying means. CONSTITUTION: The openable/closable die 1 for forming the outer shell and the core 4 set in a cavity of this die 1 are provided. The core 4 is shiftably supported in the cavity by a supporting member 5 from the outer part of the die 1 in the holding condition of the formed product. Ejecting pins 9 for separating the formed product from the die accompanying the core 4, are arranged. Then, at the time of separating the formed product from the die by opening the die 1 after forming, the core 4 is relatively shifted in the same direction as the opening direction of the die 1 and the formed product is held as the floating state in the cavity by the core. The ejecting pins 9 are shifted along the crossing direction to the core shifting direction from this holding state to push out and drop the formed product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus and a molding method suitable for, for example, an intake manifold for an engine, particularly when a three-dimensionally curved pipe joint or the like is molded by aluminum die casting or the like. More particularly, the present invention relates to a molding apparatus and a molding method capable of rapidly and smoothly releasing a molded product by using a core and an extrusion pin attached to the core.

[0002]

2. Description of the Related Art Generally, in the field of die-cast casting technology, a movable mold and a fixed mold are used.
When releasing a die cast casting that is a molded product,
It is often dropped from the exposed cavity by the opening operation of the mold.

The core used when the molded product is a hollow casting can be formed as a part of the mold as a die when the molded product has a relatively simple shape.
For example, if the shape of the molded product is complicated, such as aluminum die-casting of a three-dimensionally curved pipe joint applied to an engine intake manifold, etc., the core should also be removed in three dimensions. In addition, the mold configuration and the configuration and operation of the drive unit thereof become complicated, and smooth mold release becomes difficult.
For this reason, in the case of a molded article that bends three-dimensionally,
In reality, it is necessary to take extra time, such as releasing from the mold with the core inserted in the hollow hole, and taking it out after cooling. Further, in particular, in the case of a three-dimensionally curved molded product having a certain straight stretched portion (straight portion) at its end, it was particularly difficult to extract the core. This applies not only to the die casting technique, but also to general casting or injection molding of resin products and the like.

[0004]

In order to overcome the above-mentioned difficulties, various techniques have been carried out in which the core is moved simultaneously or sequentially in various directions to automatically perform the releasing operation. For example, the technology for extracting the core by drawing an arc in a direction that matches the curve of the product was also devised, but due to the complexity of the device configuration or operability, higher cost or lower efficiency etc. However, there were many problems. Therefore, the first object of the present invention is that it is only necessary to stop the three-dimensional drive for the core and perform a relatively simple drive, and it is possible to quickly and easily by using other easy auxiliary means. It is an object of the present invention to provide a molding apparatus and a molding method that enable reliable mold release and can improve equipment efficiency and work efficiency related to die casting and the like. Further, a second object of the present invention is to provide a molding apparatus capable of easily releasing the mold even when a molded product having a shape in which a straight stretched portion (straight portion) has a constant end is manufactured. It is to be.

[0005]

According to the first aspect of the present invention,
In a molding apparatus having a mold for forming an outer shell that can be opened and closed and a core arranged in a cavity of the mold, the core is held by a support member from outside of the mold in a molded product holding state. The first object is achieved by a molding apparatus that is movably supported in the cavity and that is provided with an extrusion pin for releasing a molded product from the core. According to a second aspect of the present invention, in a molding apparatus for producing a die-cast casting, a pair of molds that can be opened and closed in one direction and a mold opening and closing direction in the cavity by a support member from the outside of the molds are the same. , A core supported so as to be relatively movable in the direction of, and a push-out pin for mold release, which is movably supported by the support member together with the core and moves forward and backward in a direction intersecting the core moving direction, The first object is achieved by a molding device having a drive device for driving the push-out pin forward and backward outside the mold.

According to a third aspect of the present invention, there is provided a molding apparatus for manufacturing a die-cast casting for molding a three-dimensionally curved hollow casting, which is capable of opening and closing in one direction to form an outer shell of the hollow casting. Of the mold and a supporting member from the outside of the mold so as to be relatively movable in the cavity in the same direction as the opening and closing direction of the mold, and after being inserted into the hollow hole of the hollow casting from one end side. A curved core which is in a state, and an end portion of the hollow casting which is supported by the support member so as to be movable together with the core so as to move forward and backward along the axial direction of the core and which is supported by the core. The first object is achieved by a molding device having a pushing-out push-out push-out pin for releasing a molded product and a drive device for driving the push-out pin forward and backward outside the mold.

According to a fourth aspect of the present invention, there is provided the molding apparatus according to the third aspect, wherein the core of the support member of the core in a curved state has a constant straight stretched portion. Corresponding to the straight stretched portion, a protrusion for forming a relief portion is formed inside the molded product in a shape projecting from the support member, and the core is separated from the support member by a predetermined distance. The second object is achieved by making the slide movement possible.

[0008] The inventions of claims 5 and 6 achieve the above object by a suitable method for efficiently releasing the molded product from the mold using the above-mentioned molding device. That is, the invention according to claim 5 is a molding method using a mold and a core, wherein when the mold is opened after molding to release the molded product, the core is in the same direction as the opening direction of the mold. The molded product is extruded by moving the extrusion pin along the direction intersecting the core moving direction by holding the molded product in a floating state by the core by moving it relative to the core. Characterized by dropping. According to a sixth aspect of the present invention, there is provided a molding method for producing a die-cast casting, which comprises molding a three-dimensionally curved hollow casting using a mold and a core, which is a molded product obtained by opening the mold after molding. When releasing the hollow casting, the core supported from the outside of this mold is relatively moved in the same direction as the opening direction of the mold to hold the hollow casting in the cavity from the inside of the hollow hole by the core. It is characterized in that the hollow casting is extruded and dropped by moving the extruding pin along the direction intersecting the core moving direction from this floating state.

[0009]

According to the above-described molding apparatus and molding method of the present invention, the core relatively moves in the same direction as the mold in the cavity while holding the molded product. In other words, the core is neither a simple die nor a complicated three-dimensional movement. A molding product holding function is newly added to the core, and the core is designed to be driven independently of the mold. However, the movement of the core is one-dimensional. Therefore, the structure is simple and the operation is easy. On the other hand, the push-out pin attached to the core is movably supported by the support member together with the core, and moves forward and backward in a direction intersecting the core moving direction. Thereby, the extrusion operation for releasing the molded product is performed. This push-out pin also performs only one-dimensional movement. The directions function mutually by making them intersect with the operating direction of the core, and the pushing force can be exerted in the three-dimensional direction only by devising the component force.

According to the fourth aspect of the present invention, a relief portion forming protrusion for forming a thin portion is provided inside the molded product in a shape protruding from the support member, corresponding to the straight extending portion of the core. Since this part of the molded product is thin, and this core is slidable with respect to the support member by a predetermined distance, this thin part becomes a relief part at the time of pulling out, Even if there is a constant straight stretched portion (straight portion), the molded product can be removed. Therefore, according to the present invention,
As for the core, it is only necessary to stop the three-dimensional drive and perform a relatively simple drive.By using other easy auxiliary means, quick and reliable mold release can be performed, and die casting, etc. It is possible to improve the equipment efficiency and work efficiency related to the above, and the above-mentioned object can be achieved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a molding apparatus and a molding method according to the present invention will be described below with reference to the drawings. In addition,
The present embodiment is applied to a case where a three-dimensionally curved pipe joint or the like applied to an engine intake manifold is molded by aluminum die casting.
FIG. 1 is a front view showing a surface of a molding apparatus according to the present embodiment including a cavity of one mold, that is, a configuration viewed from a parting line, and FIG. 2 is an entire apparatus shown with a mold opened. 2 is a schematic perspective view of FIG. FIG. 3 to FIG. 5 are operation explanatory views that sequentially and schematically show the main points of the molding method.
13 to 13 are operation explanatory views showing the molding method in detail sequentially.

First, the structure of the molding apparatus will be described with reference to FIGS. 1 and 2 as follows. As shown in FIGS. 1 and 2, the molding apparatus according to the present embodiment has, for example, a pair of opposing outer shell molding dies 1 (movable portion 1a, fixed portion 1b) that can be opened and closed in the horizontal direction, A cavity 2 is formed in the center of these facing surfaces. The movable part 1a and the fixed part 1b of these molds are driven to open and close relative to each other in a direction A opposite to each other by a guide rod 3 and a drive cylinder (not shown) arranged along the axis indicated by the alternate long and short dash line in FIG. It has become so.

A core 4 is arranged in the cavity 2 of the mold 1. The core 4 is a vertical cylindrical support portion 4a.
And a three-dimensionally curved main body portion 4b at the lower end thereof, and the support portion 4a is provided from outside the movable portion 1a of one of the molds by the support member 5 in the opening / closing direction of the mold 1 in the cavity 2. It is supported so as to be relatively movable in the same direction A. The support member 5 is connected to a drive mechanism such as a hydraulic cylinder (not shown) by a connecting member 6, and is slidably supported by a guide member 7 with respect to the movable portion 1a of the mold. The main body portion 4b of the core 4 is three-dimensionally curved, so that after molding, the main body portion 4b is inserted into the hollow hole portion 8a of the hollow casting, which is the molded product 8, from one end side. It is designed so that it can be held by hanging.

A plurality of push-out pins 9 for releasing the molded product 8 are provided along with the core 4. These push-out pins 9 are arranged around the core 4 and are inserted into vertical support holes 10 formed in the support member 5 to cross the moving direction A of the core 4, that is, the vertical direction. It is possible to move along B. And these extruding pins 9
The lower end portion of the molded product 8 is in contact with the flange portion 8b at one end of the molded product 8. Each of the push-out pins 9 is connected to a driving device, for example, a cylinder device 16 such as a hydraulic cylinder, which is driven to move back and forth outside the die 1, via a coupling portion 11 so as to be able to move back and forth. The coupling unit 11
Are held by being guided by the guide rod 12.

In the figure, a plurality of extruding pins 9 are shown, but this is an example for smoothly extruding the molded product 8. In some cases, one extruding pin 9 may be provided, and an arbitrary number may be set. It is also possible to do so. As shown in FIG. 1, the mold 1 has a cylinder 14 for pressurizing molten metal during casting.
(See FIG. 7) are connected, and the aluminum melt is injected into the cavity 2 from here.

Next, the molding method according to the present embodiment will be described with reference to FIGS.
This will be described with reference to FIG. First, the core 4 is placed in the cavity 2 and the die 1 is closed in a state where the push-out pin 9 is pulled up to prepare the die 1 (FIG. 6). From this state, the cylinder 14 is connected to the mold 1 and a molten metal (a molten liquid of aluminum, which is indicated by the diagonal lines in the figure) is injected under pressure into the cavity 2 (FIG. 7). After the molten metal is solidified, the movable part 1a and the fixed part 1b of the mold are opened to open the cavity 2 (FIG. 8), and then the core 4 is moved to the movable part 1 of the mold.
By making relative movement in the same direction as the opening direction A of the mold with respect to a, the hollow casting that is the molded product 8 is held by the core 4 in the floating state held from the inside of the hollow hole 8a in the cavity 2. (FIGS. 3 and 9). Reference numerals 13 and 15 are biscuits and runners, which drop together with the molded product 8 and are then easily separated.

Next, the cylinder device 16 is driven to lower the push-out pin 9, the lower end of the push-out pin 9 is brought into contact with the flange portion 8b of the molded product 8 (FIG. 4), and then the push-out pin 9 is further attached. By lowering, the molded product 8 is dropped by the pushing force (see FIGS. 5, 10, and 1).
1). As a result, the release of the molded product 8 is automatically completed. After releasing the molded product 8 from the mold, the core 4 is returned to the initial position (FIG. 12), and then the mold 1 is closed to prepare for the next descent (FIG. 13). This series of work is performed in about 30 seconds.

According to the above-described embodiment, the core 4 is designed to relatively move in the cavity 2 in the holding state of the molded product 8 along the same direction as the mold 1, and even in a simple die. Unless it is a complicated three-dimensional operation, it does not perform. That is, the core 4 is provided with a molded article holding function, and the core 4
Is present independently of the mold 1 and moves relatively. However, the operation of the core 4 is one-dimensional. Therefore, the structure is simple and the operation is easy. On the other hand, the push-out pin 9 attached to the core 4 is movably supported by the support member 5 together with the core 4, and moves forward and backward in a direction B intersecting the core moving direction A. Thereby, the extrusion operation for releasing the molded product 8 is performed. The push-out pin 9 also simply performs a one-dimensional operation. By setting the direction to intersect with the operating direction of the core, the pushing force can be easily exerted by setting the component force. It is needless to say that the present invention is applicable not only to die casting but also to casting of various metals and injection molding of resins.

Next, another embodiment of the present invention will be described. 14, 15, and 16 are side sectional views showing the procedure of the operation of this embodiment. The molded product manufactured here is three-dimensionally curved, and has a special shape having straight portions 81 and 85 at both ends. A molded product having such a shape is generally extremely difficult to extract. FIG. 14 shows the positional relationship between the core 40, the support member 50, and the other end linear portion core 90 immediately after the molding of such a molded article 80. Since the manufacturing process of the molded product is the same as that of the above-mentioned embodiment, the description thereof is omitted here.

In this embodiment, the projection 51 corresponding to the straight line portion 81 of the molded product 80 is formed at the end of the support member 50, so that the straight line portion 81 of the molded product 80 is thin. Has become. And the other end straight core 90
After pulling out, the core 40 is slid in the direction of the arrow. In this embodiment, the core 40 is slidable with respect to the support member 50 by a certain distance (a distance slightly longer than the straight portion 81 of the molded product 80 as indicated by z in FIG. 15). . In this way, when the core 40 is slid, the escape portion 100 is formed between the straight portion 81 of the molded product 80 and the core 40. Thereafter, the extrusion pin 9a pushes the flange portion 82 of the molded product 80 to release the molded product (FIG. 16). At this time, since the escape portion 100 is formed, the molded product 80 can be displaced with respect to the core 40, and thus the molded product 80 can be pushed out by the extrusion pin 9a. The shape of the escape portion 100 can be set within a range that does not interfere with R of FIG.

In this embodiment, since the core 40 is slid, it is possible to preliminarily form pins on the flange portion 82 for molding and then pull it out. By doing so, holes can be simultaneously formed in the flange portion 82. In practice, holes are often provided in the flange portion 82, and there is no need to separately make holes with a drill or the like after molding.

[0022]

As described in detail in the above embodiments, according to the present invention, it is only necessary to stop the three-dimensional driving of the core and perform the relatively simple driving. By using the easy auxiliary means of, quick and reliable mold release can be performed, and die casting and other molding technology,
It is possible to improve equipment efficiency and work efficiency, and an excellent effect is obtained in molding technology. Further, according to the invention as set forth in claim 4, even a molded product having a straight portion at an end thereof can be easily released from the mold.

[Brief description of drawings]

FIG. 1 shows an embodiment of a molding apparatus according to the present invention, and is a front view showing a configuration as seen from a front surface side including a cavity of one mold.

FIG. 2 shows an embodiment of a molding apparatus according to the present invention, and is a schematic perspective view of the entire apparatus showing a state in which a mold is opened.

FIG. 3 shows an embodiment of the molding method according to the present invention, and is an operation explanatory view showing a state in which the extrusion pin is set at the extrusion position of the molded product.

FIG. 4 shows an embodiment of a molding method according to the present invention, and is an operation explanatory view showing a state in which the extrusion pin is in contact with the molded product.

FIG. 5 shows an embodiment of the molding method according to the present invention, and is an operation explanatory view showing a state where the molded product is released from the mold by the extrusion pin.

FIG. 6 shows an embodiment of the molding method according to the present invention, and is a view showing a state in which the mold is closed.

FIG. 7 shows an embodiment of a molding method according to the present invention, and is a view showing a state where a molten liquid is being injected.

FIG. 8 is a view showing an embodiment of a molding method according to the present invention and is a view showing a state where a mold is opened to open a cavity.

FIG. 9 is a view showing an embodiment of a molding method according to the present invention, and is a view showing that a molded product is held by a core in a floating state held from the inside of a hollow hole in a cavity 2. .

FIG. 10 is a view showing an embodiment of a molding method according to the present invention and is a view showing dropping of a molded product.

FIG. 11 shows an embodiment of the molding method according to the present invention, and is a view showing a condition after the molded product is dropped.

FIG. 12 is a view showing an embodiment of the molding method according to the present invention, and is a view showing a state where the core is returned to the initial position after releasing the molded product from the mold.

FIG. 13 is a view showing an embodiment of a molding method according to the present invention, and is a view showing a state of preparation for the next work with the mold closed.

FIG. 14 is a diagram for explaining another embodiment of the present invention.

15 is a view showing a state where the core of FIG. 14 is slid.

FIG. 16 is a view showing a state where the molded product is separated from FIG.

[Explanation of symbols]

 1 Mold 1a Moving part, 1b Fixed part 2 Cavity 3 Guide rod 4 Core 5 Supporting member 6 Connecting member 7 Guide member 8 Molded product 9, 9a Extruding pin 10 Supporting hole 11 Coupling part 12 Guide rod 13 Biscuit 14 Melting filler Cylinder for pressure injection 15 Runner 16 Cylinder device 40 Core 50 Supporting member 51 Protruding part 80 Molded product 81 Straight part (thin part) 82 Flange part 85 Straight part 90 Core for the other straight part 100 Relief part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication B22D 29/00 B22D 29/00 F 29/04 29/04 C

Claims (6)

[Claims] 1. A molding apparatus having an openable and closable mold for molding an outer shell, and a core arranged in a cavity of the mold, wherein the core is outside the mold with a molded product being held. And a supporting member movably supported in the cavity, and an extrusion pin for releasing the molded product is provided along with the core. 2. A molding apparatus for producing a die-cast casting, wherein a pair of molds that can be opened and closed in one direction and a support member from the outside of the molds in the same direction as the mold opening and closing direction in the cavity. A core that is supported so as to be relatively movable, a push pin for releasing a molded product that is movably supported by the support member together with the core and that moves forward and backward in a direction intersecting the core moving direction, and the push pin. A molding device, comprising: a driving device that is driven to move back and forth outside the mold. 3. A molding apparatus for producing a die-cast casting, which molds a three-dimensionally curved hollow casting, and a pair of dies that can be opened and closed in one direction to form an outer shell of the hollow casting, From the outside of the mold, a supporting member is supported in the cavity so as to be relatively movable in the same direction as the opening and closing direction of the mold, and after molding, it is inserted into the hollow hole of the hollow casting from one end side. A core and a molded product separated from the core, which is movably supported together with the core, and moves back and forth along the axial direction of the core to push the end of the hollow casting on the side supported by the core. A molding apparatus comprising: a push-out pin for a mold and a drive device for driving the push-out pin forward and backward outside the mold. 4. The molding apparatus according to claim 3, wherein the straightening portion of the base of the support member of the core in a curved state has a constant straight stretching portion, and the straightening portion of the core corresponds to the straight stretching portion. Providing a relief portion forming protrusion that forms a thin portion inside the molded product in a shape protruding from the support member, and
A molding apparatus, wherein the core is slidable with respect to the support member by a predetermined distance. 5. A molding method using a mold and a core, wherein when the mold is opened after molding to release the molded product, the core is relatively moved in the same direction as the opening direction of the mold. The molded product is held in a floating state in the cavity by the core, and the molded product is extruded and dropped by moving the extrusion pin along the direction intersecting the core moving direction from this retained state. And the molding method. 6. A molding method for producing a die-cast casting, comprising molding a three-dimensionally curved hollow casting using a die and a core, wherein the die is opened after the molding to obtain a hollow casting which is a molded article. When releasing, the core supported from the outside of the mold is relatively moved in the same direction as the opening direction of the mold to hold the hollow casting in the cavity from the inside of the hollow hole by the core. The molding method is characterized in that the hollow casting is extruded and dropped by moving the extruding pin along the direction intersecting the core moving direction from the floating state.