JP6660760B2 - Die casting apparatus and method for producing die cast molded product - Google Patents

Description

  The present invention relates to a die-casting apparatus and a method for producing a die-cast molded product suitable for producing a two-color molded product.

  2. Description of the Related Art Conventionally, in the case of combining and joining different metal materials to produce an integrated molded product, insert molding is performed. The insert molding is, for example, a molding method in which an insert component is formed by die casting using one material, and the other material is injected around the insert component by die casting.

  First, a die casting device used in such a molding method will be described with reference to FIG. FIG. 10 is a configuration diagram schematically showing a general horizontal cold chamber die casting apparatus.

  The die casting device 10 includes a base frame 20, an injection mechanism 30, a fixed plate 40, a movable plate 50, a toggle device 60, a mold clamping cylinder 70, an extrusion mechanism 80, a link housing 90, and a furnace body (not shown). .

  Each member such as the injection mechanism 30, the fixed board 40, and the movable board 50 is provided on the base frame 20. The injection mechanism 30 includes an injection cylinder 301, an accumulator 302, a plunger rod 303, a plunger tip 304 provided on the tip side of the plunger rod 303, and an injection sleeve 305.

  The injection cylinder 301 is connected to an accumulator 302 that controls the supply of the stored hydraulic pressure. By the operation of the injection cylinder 301 by the hydraulic pressure of the accumulator 302, the plunger tip 304 inserted into the plunger rod 303 and the injection sleeve 305 moves forward and backward and reciprocates.

  The fixed platen 40 is connected to the link housing 90 by a tie bar 901, and the movable platen 50 is supported by the tie bar 901 so as to be movable in the left-right direction in the figure. In addition, the movable platen 50 moves so as to approach and separate from the fixed platen 40 by the expansion and contraction operation of the toggle device 60. A mold including a fixed mold 401 and a movable mold 501 is fixed to the fixed board 40 and the movable board 50.

  A fixed die 401 of a mold is fixed to the fixed platen 40, a movable die 501 is fixed to the movable platen 50, and a cavity Ct is formed in the fixed die 401 and the movable die 501. I have.

  The mold clamping cylinder 70 has a function of operating the toggle device 60 to drive the movable platen 50 toward the fixed platen 40 and pressing the movable mold 501 against the fixed mold 401 to bring the mold clamped state. Further, the pushing mechanism 80 has a function of taking out a molded product from the movable mold 501. The furnace body stores a molten metal such as an aluminum alloy.

  A schematic operation of the die casting apparatus configured as described above will be described. In the mold clamping state, the molten metal is poured into the sleeve 304 from the furnace using a ladle. Next, the plunger tip 304 is advanced to inject and fill the molten metal into the cavity Ct of the mold. Thereafter, the movable platen 50 is driven to be separated from the fixed platen 40 side by the mold clamping cylinder 70, the mold is opened, and the extrusion mechanism 80 is operated to take out the molded product. By such a series of operations, a molded product can be manufactured.

On the other hand, in an injection molding machine that performs two-color molding, two injection units (injection mechanisms) are provided, two fixed molds (fixed dies) are mounted on a fixed die plate (fixed plate), and a movable die plate (fixed) is mounted. (Patent Document 1) is proposed in which two movable-side dies (movable dies) held on a rotary table are mounted on a panel.
Moreover, a specific molding method for molding a two-color resin molded product by rotating a movable mold is known (see Patent Document 2).

JP 2008-119848 A JP 2010-105211 A

  However, in the insert molding as described above, efficiency is low because one insert part and the other part are molded in separate steps, and dies for molding the insert part and the other part are separately provided. And the problem of high cost arises. Further, there is a problem that the joining force at the joining portion between the insert component and the other component is low.

  Further, those disclosed in Patent Document 1 and Patent Document 2 mainly relate to an injection molding machine for molding a two-color resin molded product, and do not mold a die-cast molded product. Further, two molds for molding the primary molded product and the secondary molded product are required, which may increase the cost and complicate the configuration of the injection molding machine.

  The present invention has been made in view of the above problems, and has as its object to provide a die casting apparatus and a method of manufacturing a die cast molded article that can form a two-color molded article with one apparatus and can simplify the configuration. And

The die casting apparatus according to claim 1, wherein a fixed plate to which a fixed die in the mold is fixed, a movable plate to which a movable die in the die is fixed, and the fixed plate and the movable plate are arranged in a line in a straight line. A first injection mechanism arranged therein, and a second injection mechanism arranged to intersect the first injection mechanism, so that parting injection is performed by the second injection mechanism. An injection filling hole is formed at a part of the parting line between the fixed mold and the movable mold, and an injection port of the second injection mechanism is connected to the injection filling hole. I do.
According to this invention, a two-color molded product can be formed by one die casting apparatus.

  The die casting apparatus according to claim 2 is the die casting apparatus according to claim 1, wherein a first furnace body corresponding to the first injection mechanism and a second furnace body corresponding to the second injection mechanism are formed. And wherein at least one of the first furnace body and the second furnace body is disposed between a first injection mechanism and a second injection mechanism.

Die casting apparatus according to claim 3, in the die casting apparatus according to claim 1 or claim 2, wherein the mold, have a rectangular parallelepiped shape, a surface on which the injection port is Ru is connected in the first injection mechanism The surface of the second injection mechanism is different from the surface to which the injection port is connected.

According to a fourth aspect of the present invention, in the die casting apparatus according to any one of the first to third aspects, the intersection is an orthogonal intersection.

The method for manufacturing a die-cast molded product according to claim 5 , wherein the fixed plate in the mold is fixed, the movable plate in the mold is fixed to the movable plate, and the fixed plate and the movable plate are linearly aligned. It has a first injection mechanism arranged in a line and a second injection mechanism arranged to intersect with the first injection mechanism, and the parting injection is performed by the second injection mechanism. An injection filling hole is formed at a part of the parting line between the fixed mold and the movable mold, and an injection port of the second injection mechanism is connected to the injection filling hole, In a die-casting apparatus provided with a movable part for partition that protrudes and sinks into the cavity of the mold, a primary molding step of filling the first color molten metal into the cavity with the movable part protruding into the cavity; After the mold A step of immersion of the movable element projecting into I, then, a secondary molding step of filling the second color of the molten metal into the cavity, characterized by comprising a step of removing the molded article in the cavity, the.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the die-cast apparatus and the manufacturing method of a die-cast molded article which can shape | mold the two-color molded article with one apparatus, and can simplify a structure.

It is a front view showing the die-casting device concerning the embodiment of the present invention. It is a top view showing the same die-casting device. It is a front view which shows a metal mold | die typically. It is a rear view which shows a metal mold | die typically. It is a rear view which shows the fixed type | mold in a metal mold | die typically. It is explanatory drawing which shows the clamped state in the manufacturing process of the die-cast molded article which concerns on embodiment of this invention. It is explanatory drawing which shows the same molding process. It is explanatory drawing which shows the same secondary molding process. It is explanatory drawing which shows the same mold opening and taking-out process. It is a block diagram which shows the general die-casting apparatus typically.

Hereinafter, a die casting apparatus and a method of manufacturing a die cast molded product according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the die casting apparatus, and FIG. 2 is a plan view showing the die casting apparatus. 3 to 5 schematically show a mold. FIG. 3 is a front view, FIG. 4 is a rear view, and FIG. 5 is a rear view of a fixed mold. 6 to 9 are explanatory diagrams showing the steps of manufacturing the die-cast molded product, and show the state of the mold and the molded product. The same or corresponding parts as those of the die casting apparatus shown in FIG. 10 described above may be omitted from detailed description using the same part names.
The basic configuration of the die casting apparatus according to the present embodiment is such that two injection mechanisms are provided in one die casting apparatus and a two-color molded product is manufactured using one mold.

  As shown in FIGS. 1 and 2, the die casting device 1 includes a base frame 2, a first injection mechanism 31, a second injection mechanism 32, a fixed platen 4, a movable platen 5, a toggle device 6, a mold clamping cylinder 7, An extruding mechanism 8, a link housing 9, a first furnace body 11 and a second furnace body 12 are provided.

  On the base frame 2, members such as a first injection mechanism 31, a fixed platen 4, a movable platen 5, a toggle device 6, and a mold clamping cylinder 7 are arranged in a row. That is, as shown in FIG. 2, the respective members are arranged in a linear row. In addition, a first water heater 13 is arranged near the first injection mechanism 31. The first water heater 13 has a robot arm, and a ladle is provided on the tip side. Further, a first furnace body 11 is arranged corresponding to the first water heater 13.

  On the other hand, a second injection mechanism 32 is arranged so as to intersect the first injection mechanism 31 arranged substantially in a line with the members such as the fixed platen 4 and the movable platen 5 in a substantially orthogonal manner. A second water heater 14 is arranged near the second injection mechanism 32, and a second furnace body 12 is arranged corresponding to the second water heater 14. As described above, the second furnace body 12 is disposed in the space between the first injection mechanism 31 and the second injection mechanism 32 that intersects the first injection mechanism 31 at a right angle. In this case, the first furnace body 11 may be arranged between the first injection mechanism 31 and the second injection mechanism 32.

  The first injection mechanism 31 and the second injection mechanism 32 include injection cylinders 311, 321; accumulators 312, 322; plunger rods 313, 323; Chips 314 and 324 and injection sleeves 315 and 325 are provided.

The injection cylinders 311 and 321 are connected to accumulators 312 and 322, respectively. The operation of the injection cylinders 311 and 321 by the hydraulic pressure of the accumulators 312 and 322 causes the plunger rods 313 and 323 to operate, and the plunger tips 314 and 324 inserted into the injection sleeves 315 and 325 move forward and backward to reciprocate. Operate.
Thus, the first injection mechanism 31 and the second injection mechanism 32 perform the same operation.

  Similarly to the above-described die casting apparatus 10, the fixed platen 4 is connected to the link housing 9 by a tie bar 91, and the movable platen 5 is supported by the tie bar 91 so as to be movable in the left-right direction in the drawing. In addition, the movable platen 5 moves so as to approach and separate from the fixed platen 4 by the expansion and contraction operation of the toggle device 6. A mold including a fixed mold 41 and a movable mold 51 is fixed to the fixed board 4 and the movable board 5.

  A fixed die 41 of a mold is fixed to the fixed platen 4, a movable die 51 is fixed to the movable platen 5, and a cavity Ct (not shown) is formed in the fixed die 41 and the movable die 51. Has become.

  The mold clamping cylinder 7 has a function of operating the toggle device 6 to drive the movable platen 5 toward the fixed platen 4 and pressing the movable mold 51 against the fixed mold 41 to bring the mold into a clamped state. The pushing mechanism 8 has a function of taking out a molded product from the movable mold 51.

  The first water heater 13 and the second water heater 14 supply the molten metal from the first furnace body 11 and the second furnace body 12 to the injection sleeves 315 and 325 of the injection mechanisms 31 and 32 by a ladle. It is.

  An operation panel 15 is provided on the front side of the die casting device 1. The operation panel 15 is provided with a keyboard and the like. By operating the operation panel 15, a control circuit mounted on a control panel (not shown) is operated to control the entire operation of the die casting apparatus 1.

  In the above configuration, the injection port 316 in the first injection mechanism 31, that is, the injection port 316 for pouring the molten metal to the mold side and the injection port 326 in the second injection mechanism 32 are connected to the mold. It is arranged facing the direction. Specifically, the injection port 316 of the first injection mechanism 31 is connected to the back side of the fixed die 41 which is a mold, and the injection port 326 of the second injection mechanism 32 is connected to the side of the die, that is, , And a part of a parting line between the fixed mold 41 and the movable mold 51.

  Next, the mold will be described with reference to FIGS. The mold has a substantially rectangular parallelepiped shape, and includes a fixed mold 41 fixed to the fixed board 4 and a movable mold 51 fixed to the movable board 5. An injection filling hole 41a is formed on the back side of the fixed die 41, and an injection filling hole 41b is formed at a parting line between the fixed die 41 and the movable die 51.

  That is, the injection filling hole 41a and the injection filling hole 41b are not formed on the same surface with respect to the mold, but are formed on different surfaces (the back surface and the side surface (parting line) of the fixed mold 41). Therefore, the first injection mechanism 31 and the second injection mechanism 32 can be efficiently arranged.

  The injection port 316 of the first injection mechanism 31 is connected to the injection hole 41a, and the injection port 326 of the second injection mechanism 32 is connected to the injection hole 41b. Thereby, the molten metal is injected and filled into the cavity Ct in the mold.

  Next, a manufacturing process of the die-cast molded product will be described with reference to FIGS. In each figure, (a) is a front view showing a state of a mold, and (b) is a perspective view showing a molded product in relation to a movable mold.

  In the present embodiment, for the sake of explanation, a molded product of a heart-shaped mark is taken as an example, and different metal materials, for example, pure aluminum material and ADC12 (JIS standard), which is an aluminum die-cast material, are joined at a substantially central portion as a boundary. The case where a two-color molded product is produced is shown.

Therefore, ADC 12 is stored as molten metal in first furnace body 11, ADC 12 is injected from first injection mechanism 31, and pure aluminum material is stored as molten metal in second furnace body 12. Then, a pure aluminum material is injected from the second injection mechanism 32. Incidentally, the pure aluminum material has a high thermal conductivity and is suitable for a heat radiating component, and the ADC 12 has a characteristic of high mechanical strength.
(Mold closed state)

  As shown in FIG. 6, the toggle device 6 is operated by the mold clamping cylinder 7, and the movable mold 51 is pressed against the fixed mold 41 to clamp the mold. A cavity Ct of a heart-shaped mark is formed in the mold, and a movable element M for partitioning which protrudes and retracts in about half of the cavity Ct of the movable mold 51 is provided in the cavity Ct of the movable mold 51. Has been established. Therefore, in this mold clamping state, the mover M is in a state of protruding into the cavity Ct, and the cavity Ct is a remaining area where the mover M does not protrude.

The injection filling hole 41b formed in the parting line between the fixed mold 41 and the movable mold 51 is connected to the cavity Ct through a molten metal inflow passage Pb such as a sprue or a gate. Similarly, the injection filling hole 41a formed in the fixed mold 41 is connected to the cavity Ct via the inflow passage Pa.
(Primary molding)

From the state shown in FIG. 6, the first color (pure aluminum material) is formed as shown in FIG. In this case, the injection port 326 of the second injection mechanism 32 is connected to the injection filling hole 41b, and molten metal of a pure aluminum material is injected from the injection port 326 to fill the cavity Ct. As a result, about half (left side in the figure) of the molded product G of the heart-shaped mark is molded and solidified to complete the molding of the first color.
Next, as shown in the drawing, a cavity Ct for forming the second color (ADC 12) by immersing the mover M is formed.

The molding of the first color is performed by parting injection. That is, the injection port 326 of the second injection mechanism 32 is connected to the injection filling hole 41b formed in the parting line between the fixed die 41 and the movable die 51, and injection molding is performed. The parting injection can reduce the flow resistance of the molten metal, and can suppress a decrease in the temperature of the molten metal.
(Secondary molding)

As shown in FIG. 8, the second color (ADC 12) is formed. In this case, the injection port 316 of the first injection mechanism 31 is connected to the injection filling hole 41a, and the molten metal of the ADC 12 is injected from the injection port 316 to fill the cavity Ct. As a result, about half (the right side in the figure) of the molded product G of the heart-shaped mark is molded and solidified, and the molding of the second color is completed. In this state, the first color (pure aluminum material) and the second color (ADC 12) are firmly joined and integrated to produce a two-color die-cast product G having a heart-shaped mark.
(Opening and removal)

  As shown in FIG. 9, the toggle device 6 is operated by the mold clamping cylinder 7, the movable platen 5 is driven so as to be separated from the fixed platen 4 side, and the fixed mold 41 and the movable mold 51 are separated to open the mold. . Next, the extrusion mechanism 8 is operated to take out the two-color die-cast molded product G.

  The removed two-color die-cast molded product G has an unnecessary portion g corresponding to the inflow passages Pa and Pb of the molten metal such as a sprue and a gate. The molded product G is completed.

Note that the configuration of the partitioning mover M is changed, and in the primary molding process, the color is injected from the first injection mechanism 31, and in the secondary molding process, the color is injected from the second injection mechanism 32. The die cast product G may be formed. The injection order of the two injection mechanisms can be appropriately changed depending on the molded product.
As described above, according to the present embodiment, it is possible to provide the die casting apparatus 1 which can mold the two-color molded article G with one apparatus and can simplify the configuration.

  Further, since at least one of the first furnace body 11 and the second furnace body 12 is disposed in the space between the first injection mechanism 31 and the second injection mechanism 32, the efficiency of the arrangement space is improved. Can be expected.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the gist of the invention. Further, the above-described embodiment has been presented as an example, and is not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  For example, as a two-color die-cast molded product, it can be applied to a heat-radiating component such as a heat sink. The specially applied molded articles are not limited. Further, as the metal material constituting the die-cast molded product, pure aluminum, aluminum alloy, zinc alloy, magnesium alloy or the like can be applied according to the characteristics.

DESCRIPTION OF SYMBOLS 1 ... Die-casting apparatus 2 ... Base frame 4 ... Fixed board 5 ... Movable board 6 ... Toggle apparatus 7 ... Mold clamping cylinder 8 ... Extrusion mechanism 9 ... Link housing 11 ... first furnace body 12 ... second furnace body 13 ... first water heater 14 ... second water heater 31 ... first injection mechanism 32 ... second Injection mechanism 41 ... fixed type 51 ... movable type

Claims (5)

A fixed platen to which a fixed mold in the mold is fixed;
A movable platen to which the movable mold in the mold is fixed;
A first injection mechanism arranged linearly in a row with the fixed platen and the movable platen,
A second injection mechanism disposed so as to intersect with the first injection mechanism ,
Parting injection is performed by the second injection mechanism, an injection filling hole is formed at a part of a parting line between the fixed mold and the movable mold, and the injection filling hole is formed at the injection filling hole. 2. A die casting apparatus, wherein the injection port of the injection mechanism is connected . A first furnace body corresponding to the first injection mechanism and a second furnace body corresponding to the second injection mechanism;
The die casting apparatus according to claim 1, wherein at least one of the first furnace body and the second furnace body is disposed between a first injection mechanism and a second injection mechanism. The mold is not a rectangular parallelepiped shape, a first surface on which the injection port is Ru is connected in an injection mechanism and the surface on which the injection port is connected in the second injection mechanism, and characterized in that it is a different surface The die casting apparatus according to claim 1 or 2, which performs the die casting. The intersection, die casting apparatus according to any one of claims 1 to 3, characterized in that a cross-perpendicular. A fixed plate on which a fixed die in the mold is fixed, a movable plate on which a movable die in the die is fixed, and a first injection mechanism arranged linearly in a line with the fixed plate and the movable plate; A second injection mechanism disposed so as to intersect with the first injection mechanism, and a parting injection is performed by the second injection mechanism. An injection filling hole is formed in a part of a parting line with the mold, and an injection port of the second injection mechanism is connected to the injection filling hole, and a movable partition for projecting and retracting into the cavity of the mold is provided. In a die casting apparatus having a child,
A primary molding step of filling the cavity with the first color molten metal in a state where the mover protrudes into the cavity;
After this primary molding step, a step of immersing the mover protruding into the cavity,
Next, a secondary molding step of filling the second color molten metal into the cavity,
Removing the molded product from the cavity;
A method for producing a die-cast molded product, comprising:

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