JP2022171079A - Diecasting device and diecasting method - Google Patents

Abstract

To prevent a situation where a pressing rod cannot be pulled out from a diecast product coagulating in a runner.SOLUTION: A diecasting device 1 comprises a diecasting die 10 that demarcates a cavity 53 and a runner 50 communicating with the cavity 53, first pressing means 24 and 25 that charge molten metal toward the inside of the cavity 53, second pressing means 40, 41 and 43 that press molten metal in the runner 50, where the second pressing means 40, 41 and 43 include cylindrical shaft-like second pressing rods 43 that move back and forth toward a direction nearly orthogonal to a mold-opening direction of the diecasting die 10 and a slope is formed at a tip part 43A of the second pressing rod 43A so that the tip part 43A is taper-shaped.SELECTED DRAWING: Figure 3

Description

The present invention relates to a die-casting apparatus and a die-casting method, and more particularly to a die-casting apparatus equipped with pressurizing means for pressurizing a runner of a die-casting mold and a die-casting method using the die-casting apparatus.

Conventionally, a die casting mold defining a cavity and a runner communicating with the cavity, a first pressurizing means for filling molten metal toward the cavity, and a second pressurizing means for pressurizing the molten metal in the runner. , and the second pressure means includes a second pressure rod that advances and retreats in a direction substantially perpendicular to the die opening direction of the die casting mold (for example, Patent Document 1 below reference). According to this die casting apparatus, the quality of the die cast product molded in the cavity can be improved by pressurizing the molten metal in the runner with the second pressurizing rod of the second pressurizing means. .

JP 2011-224650 A

However, in the die casting apparatus disclosed in Patent Document 1 cited above, there is a risk that the second pressure rod of the second pressure means that pressurizes the molten metal in the runner will not come off from the solidified die cast product in the runner. There was room for improvement.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems existing in the prior art, and an object of the present invention is to provide a die-cast product solidified in the runner while maintaining the quality of the die-cast product molded in the cavity. To provide a die-casting device and a die-casting method using the die-casting device, which does not cause a problem such as a second pressure rod of a second pressure means not being pulled out.

The present invention will be described below. In order to facilitate understanding of the present invention, the reference numbers of the attached drawings are added in parentheses, but the present invention is not limited to the illustrated forms.

A die-casting apparatus (1) according to the present invention comprises a die-casting mold (10) defining a cavity (53) and a runner (50) communicating with the cavity (53); A first pressurizing means (24, 25) for filling molten metal, and a second pressurizing means (40, 41, 43) for pressurizing the molten metal in the runner (50), wherein the second pressurizing means (40, 41, 43) is a die casting device (1) including a second pressure rod (43) that advances and retreats in a direction substantially orthogonal to the mold opening direction of the die casting mold (10). A tip portion (43A) of the second pressure rod (43) is formed with a slope so that the tip portion (43A) has a tapered shape.

In the die casting apparatus (1) according to the present invention, the slope can be formed at an angle of 0.1° to 0.3°.

Further, in the die casting apparatus (1) according to the present invention, the tip portion of the second pressure rod (43) has a shaft diameter φA other than the tip portion (43A) of the second pressure rod (43). The diameter dimension φa of (43A) can be formed so as to satisfy the inequality (φA-0.60 mm)<φa<(φA-0.03 mm).

Furthermore, in the die casting apparatus (1) according to the present invention, the notch (50C) is partially provided in the runner (50) where the molten metal to be pressurized by the second pressure rod (43) exists. , a portion where the thickness dimension of the solidified metal formed by solidifying the molten metal around the second pressure rod (43) is partially reduced can be provided.

Furthermore, in the die casting apparatus (1) according to the present invention, the notch (50C) is formed by a weir (35) formed in a movable mold (30) that constitutes the die casting mold (10). can be done.

Another die casting apparatus (1) according to the present invention comprises a die casting mold (10) defining a cavity (53) and a runner (50) communicating with the cavity (53); A first pressurizing means (24, 25) for filling the molten metal toward the runner (50) and a second pressurizing means (40, 41, 43) for pressurizing the molten metal in the runner (50), For die casting, wherein the pressure means (40, 41, 43) includes a second pressure rod (43) having a cylindrical axis that advances and retreats in a direction substantially perpendicular to the mold opening direction of the die casting mold (10) In the apparatus (1), after the filling of the molten metal toward the cavity (53) and the pressurization of the molten metal in the runner (50) by the second pressurizing means (40, 41, 43) are completed. , the second pressure rod (43) is configured to start retracting after the die casting mold (10) starts to open.

A die-casting method according to the present invention is characterized by performing die-casting using any one of the above-described die-casting apparatuses (1).

According to the present invention, the problem that the second pressure rod of the second pressure means cannot be removed from the solidified die-cast product in the runner while maintaining the quality of the die-cast product molded in the cavity occurs. It is possible to provide a die-casting apparatus free from any defects and a die-casting method using the die-casting apparatus.

FIG. 5 is a cross-sectional view showing a state in which the pressure rod is in the retracted position in the die casting apparatus according to the present embodiment; FIG. 4 is a cross-sectional view showing a state in which the pressure rod is in the advanced position in the die casting apparatus according to the present embodiment; It is a figure which shows the shape of the pressure rod with which the apparatus for die-casting which concerns on this embodiment is provided. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a characteristic configuration of a die casting apparatus according to the present embodiment, in which part (a) of the figure is a cross-sectional view showing the periphery of a pressure rod, and part (b) is a part of FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. (a); FIG. 5 is a view showing the movable die of the die casting apparatus according to the present embodiment shown in FIG. 4, in which part (a) is a side view seen in the mold opening direction, and part (b) is a part view; It is sectional drawing which shows the vertical cross section of the center part of (a). It is a sectional view for explaining operation of a device for die-casting concerning this embodiment.

Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the solution of the invention. .

A basic configuration of a die casting apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. Here, FIG. 1 is a cross-sectional view showing a state in which the pressure rod is in the retracted position in the die casting apparatus according to this embodiment. FIG. 2 is a cross-sectional view showing a state in which the pressure rod is in the advanced position in the die casting apparatus according to this embodiment.

As shown in FIG. 1, the die casting mold 10 includes a stationary mold 20 and a movable mold 30. As shown in FIG. The fixed die 20 comprises a fixed holder 21 and a fixed die 22, and the fixed holder 21 is provided with an injection sleeve 23 (sleeve). A plunger tip 25 connected to the tip of the plunger rod 24 is arranged in the injection sleeve 23 . By operating an injection cylinder (not shown) to slide the plunger tip 25 within the injection sleeve 23, molten metal such as an aluminum alloy supplied from a hot water supply hole (not shown) of the injection sleeve 23 is injected into a cavity 53, which will be described later. Fillable. The plunger tip 25, plunger rod 24, and injection cylinder (not shown) constitute the first pressurizing means according to the present invention. Also, the plunger rod 24 constitutes the first pressure rod according to the present invention.

The movable die 30 is composed of a movable holder 31, a movable die 32, and a shunt element 33, and is movable in the movement direction of the movable die 30 (mold opening direction of the die casting die 10) indicated by arrows A←→A'. . 1 and 2, a runner 50, a gate 52, and a cavity 53 are defined inside the die casting mold 10, and the space in the injection sleeve 23 is formed via the runner 50 and the gate 52. It communicates with cavity 53 . The runner 50 includes a first runner 50A extending in a direction slightly inclined with respect to the axial direction of the injection sleeve 23 (the mold opening direction of the die casting mold 10), and a direction substantially orthogonal to the axial direction of the injection sleeve 23. and a second runner 50B extending to the The first runner 50</b>A is defined by the injection sleeve 23 arranged on the fixed mold 20 and the diverter 33 of the movable mold 30 . The second runner 50B has a portion defined by the injection sleeve 23 and the flow diverter 33 and a portion defined by the fixed die 22 and the movable die 32 . In this embodiment, the portion of the second runner 50B defined by the injection sleeve 23 and the diverter 33 is formed as a cylindrical runner having a cylindrical inner space, and the fixed die 22 and the fixed die 22 of the second runner 50B are formed. A portion defined by the movable die 32 is formed as a trapezoidal runner having a trapezoidal inner space. Gate 52 and cavity 53 are defined by fixed die 22 and movable die 32 .

A hydraulic cylinder 40 is fixed to the flow divider 33 via a bracket (not shown). A pressure rod 43 is connected to the piston rod 41 of the hydraulic cylinder 40 via a coupling 42 . The pressure rod 43 is inserted into the through hole 34 formed in the flow divider 33 , and the tip 43 A of the pressure rod 43 closes the upper opening 34 A of the through hole 34 . The pressure rod 43 can move forward and backward in a direction substantially perpendicular to the mold opening direction of the die casting mold 10 by operating the hydraulic cylinder 40. When the hydraulic cylinder 40 is operated, the pressure rod 43 is moved to the retracted position shown in FIG. 2 can enter the second runner 50B and advance to the forward position shown in FIG. Therefore, in the die casting apparatus 1 according to the present embodiment, by advancing the pressure rod 43 into the second runner 50B, it is possible to pressurize the molten metal in the cavity 53 through the molten metal in the second runner 50B. is. The hydraulic cylinder 40, the piston rod 41, and the pressure rod 43 constitute the second pressure means according to the invention. Also, the pressure rod 43 constitutes a second pressure rod according to the present invention.

The pressure rod 43 is shaped like a cylindrical shaft. The second runner 50B has a corresponding shape portion 51 formed in a circular shape so as to correspond to the cross-sectional shape of the pressure rod 43. A surface 51A defining the corresponding shape portion 51 and the pressure rod 43 is set in the range of, for example, 0.5 to 3.0 mm. If the gap is less than 0.5 mm, the thin portion solidified in the gap will be cut when the die-cast product is taken out. Further, if the gap exceeds 3.0 mm, it is not possible to sufficiently prevent the molten metal from flowing back through the gap when the pressurizing rod 43 pressurizes the molten metal in the second runner 50B. It is not possible to give a sufficient feeder effect to the molten metal. When the molten metal in the second runner 50B has good fluidity, backflow is likely to occur from the gap. Therefore, the pressure rod 43 pressurizes the molten metal in the second runner 50B before the cavity 53 is completely filled with the molten metal. In this case, it is preferable to set the gap between the surface 51A of the second runner 50B defining the corresponding shape portion 51 and the pressure rod 43 to 3.0 mm or less.

The basic configuration of the die casting apparatus 1 according to this embodiment has been described above. Next, with reference to FIGS. 3 to 6, the characteristic configuration of the die casting apparatus 1 according to this embodiment will be described. Here, FIG. 3 is a diagram showing the shape of the pressure rod provided in the die casting apparatus according to this embodiment. 4A and 4B are diagrams for explaining the characteristic configuration of the die casting apparatus according to the present embodiment, and FIG. FIG. (b) is a cross-sectional view taken along the line AA in FIG. (a). FIG. 5 is a diagram showing the movable die of the die casting apparatus according to the present embodiment shown in FIG. (b) is a cross-sectional view showing a vertical cross-section of the central portion of the partial view (a). In addition, in FIG. 5(a), illustration of the pressure rod 43 is omitted for convenience of explanation. Furthermore, FIG. 6 is a sectional view for explaining the operation of the die casting apparatus according to this embodiment.

As shown in FIG. 3, the pressure rod 43 provided in the die casting apparatus 1 according to the present embodiment is characterized by forming a slope so that the tip portion 43A thereof has a tapered shape. The gradient formed at the tip portion 43A of the pressure rod 43 is formed at an angle of 0.1° to 0.3°. Regarding the shape of the tip portion 43A of the pressure rod 43, the diameter dimension φa of the tip portion 43A of the pressure rod 43 is
(φA-0.60mm)<φa<(φA-0.03mm)
It is characterized in that it is formed so that the following inequality holds. When the shape of the tip portion 43A of the pressure rod 43 is formed under such conditions, the second runner 50B is filled with the molten metal and the pressure rod 43 pressurizes the molten metal in the second runner 50B. In addition, the pressure rod 43 can be smoothly advanced and retracted without the molten metal entering the portion where the gradient is formed. In particular, regarding the condition of "φa<(φA−0.03 mm)" in the above inequality, if the dimensional difference between φA and φa is −0.03 mm or less, the effect of providing the gradient is reduced. Regarding the condition of "(φA - 0.60mm) <φa" in the inequality, if the dimensional difference between φA and φa is -0.60mm or more, the molten metal will be inserted into the part where the gradient is given, resulting in smooth forward and backward movement. will have an adverse effect on These conditions are conditional values found and determined through intensive research by the inventor.

Moreover, in the die casting apparatus 1 according to the present embodiment, as shown in FIG. A portion where the thickness of the solidified metal formed by solidifying the molten metal is partially thinned is provided around 43 (especially, see FIG. 4(b)). In the case of the present embodiment shown in FIG. 4, a total of two notch portions 50C are provided, one each on the movable mold 30 side and the fixed mold 20 side. By providing two notches 50C in a portion of the solidified metal surrounding the pressure rod 43 in this manner, the force of the solidified metal holding the pressure rod 43 is reduced, so that the pressure rod 43 is retracted. When the pressure rod 43 is pulled out from the die-cast product, a smooth retraction operation can be realized.

Note that the notch 50C of the present embodiment has a trapezoidal shape in a cross-sectional view, and the trapezoidal shape has an upper side dimension of 2 mm, a lower side dimension of 3 mm, and a length dimension of about 70 mm in the vertical direction. . 5, the notch portion 50C of the present embodiment can be formed by a weir 35 formed in the movable mold 30 (or the fixed mold 20) that constitutes the die casting mold 10. As shown in FIG. Regarding the conditions for forming the weir 35, for example, when the stroke of the forward and backward movement of the pressure rod 43 is 80 mm, the distance from the position 10 mm above the stroke start position of the pressure rod 43 to the stroke end position is 70 mm. Research by the inventors has revealed that it is preferable to form the groove with a thickness. By forming the notch portion 50C and the weir 35 under the above-described dimensional conditions, a smoother retraction operation is realized when the pressure rod 43 is retracted and the pressure rod 43 is pulled out from the die-cast product. becomes possible.

Further, in the die casting apparatus 1 according to this embodiment, the operating conditions for the mold opening operation of the die casting mold 10 and the retracting operation of the pressure rod 43 are also improved. That is, as shown in FIG. 6, in the die casting apparatus 1 according to the present embodiment, after the filling of the molten metal toward the cavity 53 and the pressurization of the molten metal in the runner 50 by the pressure rod 43 are completed, the die casting metal is An operation condition was adopted in which the pressure rod 43 started to retract immediately after the mold 10 started to open. Here, in the prior art, generally, an operation condition is adopted in which the die casting mold 10 is opened after the retraction operation of the pressure rod 43 is completed. However, when the die casting mold 10 is not opened, the die casting product is pressed by the movable mold 30 and the fixed mold 20, and this pressing force causes the pressure rod 43 to move backward. It had an effect of inhibiting However, in the present embodiment, since the operation condition is adopted in which the pressure rod 43 starts retracting immediately after the mold opening of the die casting mold 10 is started, the movable mold 30 and the fixed mold 20 can The pressure rod 43 can be pulled out from the die-cast product in a state in which the pressing force is released. In addition, the operating conditions of the present embodiment do not deteriorate the time cycle in executing the die casting method, so it is possible to contribute to the improvement of product quality and equipment life while maintaining productivity.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be added to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

1 die casting device, 10 die casting mold, 20 fixed mold, 21 fixed holder, 22 fixed die, 23 injection sleeve (sleeve), 24 plunger rod (first pressure means, first pressure rod), 25 plunger tip ( first pressurizing means), 30 movable die, 31 movable holder, 32 movable die, 33 diverter, 34 through hole, 34A upper opening, 35 weir, 40 hydraulic cylinder (second pressurizing means), 41 piston rod (second 2 pressure means), 42 coupling, 43 pressure rod (second pressure means, second pressure rod), 43A tip, 50 runner, 50A first runner, 50B second runner (runner), 50C notch part, 51 corresponding shape part, 51A surface, 52 gate, 53 cavity.

Claims (7)

a die casting mold defining a cavity and a runner communicating with the cavity;
a first pressurizing means for filling the molten metal into the cavity;
a second pressurizing means for pressurizing the molten metal in the runner;
with
A die casting device in which the second pressure means includes a second pressure rod that advances and retreats in a direction substantially orthogonal to the mold opening direction of the die casting mold,
A die-casting device, wherein a slope is formed at the tip of the second pressure rod so that the tip has a tapered shape. The die casting apparatus according to claim 1,
A die casting apparatus, wherein the slope is formed at an angle of 0.1° to 0.3°. In the die casting apparatus according to claim 2,
The diameter dimension φa of the tip portion of the second pressure rod is (φA−0.60 mm)<φa<(φA−0.03 mm) with respect to the shaft diameter φA of the portion other than the tip portion of the second pressure rod. A die casting apparatus characterized by being formed so that the following inequality holds. In the die casting apparatus according to any one of claims 1 to 3,
A thickness dimension of the solidified metal formed by solidifying the molten metal around the second pressure rod by partially providing a notch in the runner where the molten metal to be pressurized by the second pressure rod exists. A die-casting device characterized by providing a part where the thickness is partially thinned. In the die casting apparatus according to claim 4,
A die-casting apparatus, wherein the notch is formed by a weir formed in a movable mold that constitutes the die-casting mold. a die casting mold defining a cavity and a runner communicating with the cavity;
a first pressurizing means for filling the molten metal into the cavity;
a second pressurizing means for pressurizing the molten metal in the runner;
with
A die-casting device in which the second pressure means includes a cylindrical shaft-shaped second pressure rod that advances and retreats in a direction substantially orthogonal to the mold opening direction of the die casting mold,
After the filling of the molten metal into the cavity and the pressurization of the molten metal in the runner by the second pressurizing means are completed, the second pressure rod is retracted after the mold opening of the die casting mold is started. Apparatus for die casting, characterized in that it is arranged to be put into motion. A die-casting method, wherein die-casting is performed by the die-casting apparatus according to any one of claims 1 to 6.

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