JP2022162483A - Method and apparatus for manufacturing die cast by partial ultra-high pressure - Google Patents

Abstract

To provide a method and an apparatus for manufacturing die cast for improving the density of an intended part by ultra-high pressure.SOLUTION: A die-casting apparatus using partial ultra-high pressure comprises: primary pressurizing means for injecting molten metal through multiple branch runners into a die-casting mold; secondary pressurizing means for selecting a part of the branching runners or providing a new branching runner in the case of a single runner by forming a new branching runner and being attached to the selected or new branching runner to enable pressurization at a pressure higher than that of the primary pressurizing means; a control section for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means; and an orifice formed on the pressurizing passage surface of the secondary pressurizing means.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and apparatus for manufacturing die casting by partial ultra-high pressure, and in particular, a tundish is provided in a branched runner that is the inlet of the molten metal of the mold, an ultra-high pressure pressurizing cylinder is attached, and a pressure pin connected to it is pressed. It relates to a die casting manufacturing method and apparatus for increasing the density of product parts.

A die-cast product is cast by injecting a molten metal such as aluminum into a mold cavity with a plunger and taking out the solidified product in a shape that follows the cavity. A method has been proposed in which the runner is further pressurized in accordance with the pressurizing operation of the plunger so as to prevent the formation of cavities during molding as a product.

The runner consists of a shunt runner along the direction of plunger extrusion and a rising runner perpendicular to it. After the pressurization of the plunger is completed, the pressurization pin of the runner is operated to perform further pressurization (Patent Document 1).

In the case of Patent Document 1, since the molten metal pushed into the cavity is about to solidify, the molten metal pushed by the runner pressurization flows backward and is pushed back to the plunger side, resulting in an unexpected cavity. No pushing effect was obtained. From this point of view, the technique listed in Patent Document 2 has been proposed, in which the gap between the inner diameter of the member forming the rising runner portion and the outer diameter of the pressure pin is uniformly set to 0.5 to 3 0 mm, the backflow prevention function is exhibited, and the pushing effect is obtained. In general, the flow rate Q of the annular gap is proportional to the cube of the annular gap Δ and inversely proportional to its length L. Therefore, it is important to reduce the gap Δ. However, although the clearance Δ between the inner diameter of the member forming the rising runner portion and the outer diameter of the pressure pin is set to 0.5 to 3.0 mm, it is practically impossible to form such a cylindrical clearance. It becomes difficult, the gap becomes large, and the gap length L is required to some extent. Therefore, even if the pressurizing pin is pressurized and inserted, the molten metal flows back through the gap Δ and the plunger is pushed back, so that the intended backflow prevention effect cannot be obtained.

In particular, in the conventional method, there are cases where plunger injection is performed from multiple branched runners according to the product shape due to the cavity. was there. Moreover, it is more difficult when the branched runner is not connected to the location where the cavity is generated, or when manufacturing through a single runner.

JP 2000-117411 JP 2011-224650

The present invention focuses on the above problem, and when pressurizing the runners after the molten metal is injected by the plunger through a plurality of branched runners, the selected branched runner portions continue to apply pressure to the molten metal at a high pressure. It is an object of the present invention to provide a die casting manufacturing method and apparatus for improving the density of an intended part by partial ultrahigh pressure that can produce a dense die cast product by solidifying with pressure. In addition, a new branched runner is additionally formed, and secondary pressure is applied from there to manufacture a dense die-cast product.

In order to achieve the above objects, the present invention is configured as follows. That is, in the die casting method using partial ultrahigh pressure according to the present invention, molten metal is injected into a clamped mold through a plurality of branched runners by a primary pressurizing means, and communicates with a portion where density improvement is desired. A branch runner is selected, a pressurization path is provided in the middle of the branch runner so that a hot pool can be secured, an orifice is provided in the pressurization path toward the product, and the inside of the branch runner flows in the same direction as the molten metal flow. A pressurizing pin for the secondary pressurizing means is provided to move to the second pressurizing means, and pressurization is performed by the pressurizing pin for the secondary pressurizing means after the injection by the primary pressurizing means is completed.

In addition, the molten metal is injected into the clamped mold via a plurality of branched runners and a newly set branched runner connected to the part where the density is to be improved by the primary pressurizing means, and this new A secondary pressurizing means for providing a pressurizing path in the middle of the branch runner where a tundish can be secured, providing an orifice in the pressurizing path toward the product, and moving in the branch runner in the same direction as the flow of the molten metal. A pressurizing pin for the secondary pressurizing means may be provided, and runner pressurization may be performed by the pressurizing pin for the secondary pressurizing means after the completion of injection by the primary pressurizing means.

Furthermore, a branch runner is newly added to the part where the density is to be improved in the mold with a single runner structure. A secondary pressurizing means for providing a pressurizing path in a portion where a tundish can be secured in the middle of the added branch runner, providing an orifice in the pressurizing path, and moving in the branch runner in the same direction as the flow of the molten metal. A pressure pin for the secondary pressure means may be provided, and pressure may be applied by the pressure pin for the secondary pressure means after the injection by the primary pressure means is completed.

In addition, the molten metal is injected into the clamped mold via a plurality of branch runners by the primary pressurizing means, and the diverter base runner that communicates with the part where the density is to be improved is selected, and this branch runner is selected. A pressurization path is provided in the middle where a hot pool can be secured, an orifice is provided in the pressurization path toward the product, and a secondary pressurization means moves in the same direction as the flow of the molten metal in the branch runner. A die casting that improves the density of an intended portion by partial ultrahigh pressure, characterized in that a pressurizing pin is provided, and pressurization is performed by the pressurizing pin for the secondary pressurizing means after the completion of injection by the primary pressurizing means. A manufacturing method is possible.

In these cases, the secondary pressurizing means blocks the tundish with the pressurizing pin and a metal seal formed by a minute gap between the orifice and the pressurizing pin. It is possible to avoid transmission of pressure by the pressure means and to pressurize the product portion with high pressure by the secondary pressure means.

Further, the start time of the secondary pressurizing means after the completion of injection by the primary pressurizing means may be set by providing a control mechanism.
Further, the pressure pin of the secondary pressure means attached to the branch runner and the pressure cylinder for driving the pressure pin may be set on either the fixed mold side or the movable mold side of the mold.

The ultra-high pressure die casting apparatus according to the present invention comprises a primary pressurizing means for injecting molten metal into a die casting mold through a plurality of branched runners, and a part of the branched runners selected and attached to the selected branched runners. A secondary pressurizing means capable of pressurizing at a pressure higher than that of the primary pressurizing means, and a control unit for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means. and an orifice formed in the pressure path surface of the secondary pressure means.

In addition, a primary pressurizing means for injecting the molten metal via a plurality of branch runners in the die casting mold and a newly installed branch runner connected to the part where the density improvement is desired, and a primary pressurizing means attached to the new branch runner A control mechanism for setting a secondary pressurizing means capable of pressurizing at a pressure higher than that of the primary pressurizing means, and a start time for operating the secondary pressurizing means after completion of filling of the molten metal product by the primary pressurizing means. and an orifice formed in the pressure path surface of the secondary pressure means.

Furthermore, primary pressurization means for injecting the molten metal via a single runner in the die casting mold and a newly installed branch runner connected to the part where the density improvement is desired, and attached to this new branch runner A control mechanism for setting a secondary pressurizing means capable of pressurizing at a pressure higher than that of the primary pressurizing means, and a start time for operating the secondary pressurizing means after completion of filling of the molten metal product by the primary pressurizing means. and an orifice formed in the pressure path surface of the secondary pressure means.

In addition, a primary pressurizing means for injecting molten metal into a die casting mold through a plurality of branch runners and a diverter base runner in front of the branch runner communicating with a portion to be improved in density are selected, and this selected diverter base is selected. A secondary pressurizing means attached to the runner and capable of pressurizing at a pressure higher than that of the primary pressurizing means, and a start time for operating the secondary pressurizing means after completion of filling of the molten metal product by the primary pressurizing means. It is possible to provide a die casting apparatus using partial ultrahigh pressure, characterized by comprising a control section for setting and an orifice formed in the pressurizing path surface of the secondary pressurizing means.

In these cases, the secondary pressure means may be provided on the fixed mold side, or may be provided so as to be able to apply pressure along the mold clamping surface.

According to the above configuration, the molten metal is pressurized by the pressurizing pin as the secondary pressurizing means after injection through the branch runner by the plunger as the primary pressurizing means, so the secondary pressurizing means is provided. Runners other than the runner are solidified at the gate portion of the cavity entrance to block backflow. At the same time, in the pressurizing passage of the secondary pressurizing means, the orifice provided in the part of the pressurizing passage forms a metal seal due to its throttling effect. Therefore, in the secondary pressurizing means, it is possible to pressurize with a suitable partial super-high pressure. As a result, it becomes possible to partially pressurize the product portion with an ultra-high pressure, and the partially generated porosity is eliminated. Among the branch runners in the mold, select the branch runner to the place where you want to increase the density, or if there is a place where the runner to the place where you want to increase the density is not installed, install a new branch runner there. Alternatively, if the mold has a single runner, a new branch runner may be provided. In such a case, a high-pressure injection can be partially pressurized secondarily, thereby making it possible to manufacture a die-cast product without the generation of cavities.

1 is a schematic front view of an injection including a runner for a die cast product from an ultra-high pressure die casting manufacturing apparatus according to an embodiment; FIG. 2 is a schematic side view of FIG. 1; FIG. It is a cross-sectional view of a secondary pressurizing means attached to the branch runner portion. FIG. 10 is an injected schematic front view including runners of die cast products from ultra-high pressure die casting manufacturing apparatus according to another embodiment; Figure 5 is a schematic side view of Figure 4;

Hereinafter, a detailed description will be given of a method and an apparatus for producing a die-cast using a partial extra-high pressure according to an embodiment of the present invention with reference to the drawings. It should be noted that the following description is merely one example, and the present invention may include various modifications as long as the gist of the present invention is not changed.

Figures 1 and 2 show the die-cast products manufactured by the die-cast manufacturing apparatus using partial ultra-high pressure according to this embodiment, the branch runners leading to the products, and the mounting positions of the ultra-high pressure pressurizing cylinders attached to the specific branch runners. A schematic front view and a schematic side view are shown. As shown in these figures, the die cast product 10 has a biscuit 12 pushed out from the plunger side as a front end, and a runner serving as a passage from the biscuit 12 to the cavity bends and rises upward (divider base runner 14). Further, a plurality of runners (branched into four in the illustrated example) are formed (branched runners 16a, 16b, 16c, 16d), and gates 18a, 18b, 18c, 18d are formed at four locations on the die cast product 10. is open through

Since there is a problem that cavities are likely to occur when molten metal injected from the branch runner 16a on the left side shown in FIG. , After injecting the required amount of molten metal for the die cast product 10 by the primary pressurizing means 20 (see FIG. 2), by the secondary pressurizing means 22 (see FIG. 3) provided on the selected branch runner 16a, The secondary pressurization is performed at an ultra-high pressure approximately four times as high as the primary pressurization.

The primary pressurizing means 20 and the secondary pressurizing means 22 will be described with reference to FIGS. The die-cast manufacturing apparatus comprises a movable mold 24 attached to a movable platen and a fixed mold 26 attached to a fixed platen. After injection, the die cast product 10 having a shape following the cavity 28 is completed. The product 10 can be removed from the cavity 28 by separating the molds 24 and 26 and actuating the ejector pins provided on the back side of the movable mold 24 .

In order to supply molten metal to the cavity 28 of such a die-cast manufacturing apparatus, a hot water supply means is positioned below the cavity 28 as an injection section of the primary pressurizing means 20 . As shown in FIG. 2, the primary pressurizing means 20 consists of an injection sleeve 30 mounted horizontally through a fixed platen and reaching a fixed mold 26, and a planer disposed within the injection sleeve 30. It is composed of a plunger 32 and a pressurizing device (not shown) located behind the plunger 32 and capable of pushing and pulling the plunger 32 .

Formed above the front end of the injection sleeve 30 is a runner that serves as a passage leading to the cavity 28. This is composed of a diverter base runner 14 before branching and four branching runners 16a, 16b, 16c and 16d, followed by these. Molten metal is injected into cavity 28 by gates 18a, 18b, 18c, and 18d to form die cast product 10. FIG. Suppose now that the die-cast product 10 has a problem that many cavities occur in the product portion ejected from the branch runner 16a at the left end of FIG.

Therefore, this branch runner 16a is selected, and secondary pressurization is performed at this selected branch runner 16a portion. In this embodiment, as shown in FIG. 3, the secondary pressurizing means 22 is arranged on the mold clamping surface of the mold. It is set so as to be an upward direction orthogonal to the pushing direction of the plunger 28 .

In FIG. 3, this selective branch runner 16a consists of a first diverter runner 36 branched from the diverter base runner 14 extending substantially vertically from the injection sleeve 30 and turned obliquely upward, followed by a first diverter runner 36 which extends vertically. It has a curved shape consisting of a continuous rising runner 38 . The rising runner 38 is turned upward so as to be directly connected to the bottom of the cavity 28 , and the molten metal pushed out by the plunger 32 passes through the diverter base runner 14 to the rising runner portion 38 . , and is configured to inject and inject into the cavity 28 from the gate 18a. The stroke amount of the pressurizing pin 34 in the rising runner 38 of the selective branch runner 16a becomes a tread pool required for secondary pressurization.

A secondary pressurizing means 22 for secondarily pressurizing the molten metal in the cavity 28 is provided in the first diverter runner 36 in the branch runner 16a. The secondary pressurizing means 22 is provided along the mold clamping surface and consists of a lower actuator 40 and a pressurizing pin 34 mounted so as to move in and out along a rising runner 38 (pressurizing path). It is configured. The diameter d of the pressure pin 34 is made smaller than the inner diameter D of the rising runner 38 so that the pressure pin 34 can slide up and down on the rising runner 38 . Therefore, the amount of press-fitting of the pressure pin 34 into the rising runner 38 (the amount of tundish that is pushed away) improves the density of the product by the cavity 28 .

By the way, in this embodiment, the first branch runner 36 side (FIG. 3 B portion) is formed with an orifice 44 for narrowing its inner diameter. This is formed by forming an annular protrusion 46 with a rectangular cross section on the inner diameter portion of the rising runner 38. The height of the annular protrusion 46 is matched to the outer diameter d of the pressure pin 34 as much as possible so that a metal seal can be formed here. ing. Specifically, although it depends on the size of the cavity 28, the gap between the pressure pin 34 and the annular projection 46 of the rising runner 38 is empirically desirably about 1 mm, which provides a metal sealing effect due to solidification of the molten metal. Although this optimum value varies depending on the axial length of the annular projection 46, the shape of the mold, the injection pressure, and the speed, it is often about 0.5 mm to 1.0 mm on average. Further, the axial length L of the annular protrusion 46 is often about 10 mm on average in order to obtain a high metal sealing effect, but this varies depending on the shape of the mold, injection pressure, speed, and the like. These ensure a reliable metal seal.

The secondary pressurizing means 22 constructed in this way is arranged such that when the pressurizing pin 34 reaches the annular protrusion 46 after the injection by the plunger 32 of the primary pressurizing means 20 is completed, the orifice 44 portion is pushed upward. Molten metal penetrates to form a metal seal, and that part exhibits a shielding function. Therefore, the metal seal at the orifice 44 portion increases the amount of molten metal filled into the cavity 28, and the pushing operation by the pressure pin 34 lengthens the stroke to complete the work.

At this time, the start time of the secondary pressurizing means 22 after completion of injection by the primary pressurizing means 20 (approximately 70 MPa) can be set by providing the control mechanism 48. In this case, in this embodiment, After completion of injection by the primary pressurizing means, the secondary pressurizing means 22 is started with a delay of about 0.1 second. Although it is around 0.1 second in the embodiment, the optimum value of this delay time depends on various conditions such as the shape of the mold, the first pressurization pressure, and the pressurization speed on the order of mSec. Although necessary, the time setting of this device can be set in mSec order. This time setting exerts a metal seal at the injection ports of the non-selective branch runners 16b, 16c, and 16d in which the secondary pressurizing means 22 is not provided. The molten metal contacts the mold and solidifies, and the part not in contact is in a state of semi-solidification. Therefore, the non-selective branch runners 16b, 16c, and 16d are metal-sealed, and the orifice 44 is used for metal-sealing, so that the secondary pressurizing means 22 can perform partial pressurization at an ultrahigh pressure (approximately 250 MPa). can be done. That is, partial pressurization about four times that of the primary pressurizing means 20 is possible.

The annular protrusion 46 forming the orifice 44 may have a square cross section as in the embodiment, but may have a V-shaped or arc-shaped cross section. In this case, if the cutting edge of the V-shape or arc-shaped cutting edge is sharp, the metal seal cannot be obtained, so it is desirable to cut the tip.

Cooling means may also be arranged in the annular projection 46 forming the orifice 44 . This can be done by a horizontal system, a water cooling system, or an oil cooling system, and it is preferable to cool the annular protrusion 46 when the injection by the primary pressurizing means 20 is completed and the pressurization by the secondary pressurizing means 22 is applied to the annular projection 46 . This facilitates the formation of a metal seal.

In the above-described embodiment, the annular projection 46 forming the orifice 44 may be formed as a separate part, and attached by a fitting structure when forming the runner 16a. This is because the runner 16a has a structure in which the runner 16a splits vertically at the parting line of the mold, so that it can be easily attached to the rising runner 38 having a semicircular structure.

The above embodiment can also be applied to pushing runners in hot chambers and molding plastics.

As described above, according to this embodiment, the injection into the cavity 28 is performed by the primary pressurizing means 20, and the secondary pressurizing means 22 is activated with a slight delay after the runner 16a is filled with the molten metal. Then, while the pressurizing pin 34 reaches the intersection of the first diverter runner 36 and the rising runner 38 (FIGS. 3A->B), the normal pushing action is performed, but the first diverter runner 36 is cut and the orifice is formed. As soon as it reaches 44, the annular projection 46 reaches the part, the molten metal is solidified by the metal seal in the gap δ, and the pressure is cut off here. At this time, the injection openings of the non-branching selection b runners 16b to 16d are in a solidified state, and the openings are closed. Therefore, the runner molten metal on the side of the cavity 28 that is positioned above the pressure pin 42 and has not yet solidified is pushed into the side of the cavity 28 against the background of the cut-off pressure.

This allows the pressing pin 34 to be advanced more than the conventional stroke, and the secondary pressing means 22 can produce locally stronger and more dense products. The effect at this time is a weight increase of 1.7% when the same volume of cavity 28 is filled with molten metal, which is an amazing value in this industry.

In the above embodiment, the secondary pressurizing means 22 is arranged along the direction perpendicular to the plunger stroke (mold clamping surface). may be provided. This second embodiment is shown in FIGS. In this example, since the product portion 33 has a flat plate shape, the mold clamping line is perpendicular to the plate surface. The plunger 32, which is the primary pressurizing means 20, is configured to move from the front side to the back side in the drawing, and passes through paths from the four branched runners 16a, 16b, 16c, and 16d to the die cast product 10. It will be extruded. The secondary pressurizing means 22, which is performed after the completion of the extrusion by the primary pressurizing means 20, forms a runner part formed in the selected branch runner 16a in parallel with the operating direction of the plunger 32, and the parallel runner 50 It is mounted to apply pressure parallel to the plunger 32 . In this case, an orifice 44 is provided in the parallel runner 50, and the pressure pin 34 slides thereon. The start time of pressurization by the secondary pressurizing means 22 is also slightly delayed after the completion of injection by the primary pressurizing means 20, and is configured to operate after the delay time set in the control mechanism 48. FIG. As a result, a partial ultrahigh pressure (250 MPa) can be applied by the secondary pressurizing means 22 .

In the example shown in FIGS. 4 and 5, the secondary pressurizing means 22 has the actuator 40 and the pressurizing pin 34 attached inside the stationary mold. may be extended and arranged.

In addition, in the above embodiment, it is assumed that the product has branch runners 16a to 16d from the beginning. A new branched runner may be provided in the direction of the plunger, and the secondary pressurizing means 22 may exert a partial pressure (approximately 250 MPa) higher than the plunger pressure (approximately 70 MPa) on this new runner portion. Also, in the case of a mold that forms a product with a single runner, formation of a cavity can also be partially prevented by forming a new runner section and forming the secondary pressure means 22 therein. It is possible to provide detailed support for each product.

Furthermore, when there are a plurality of branch runners leading to the location where the density is desired to be increased, a diverter base runner is provided to integrate these branch runners, and the diverter base runner is provided with a secondary pressurizing means, thereby dividing the plurality of branch runners. Secondary pressurization is also possible.

In the present invention, following the plunger pressurization of the primary pressurizing means in die casting, a selected or new runner can be selected and the pressurization of the portion requiring strength can be performed by the secondary pressurizing means, A method and apparatus capable of increasing product density.

10 Die-cast products 12 Biscuits 14 Diverter base runners 16a, 16b, 16c, 16d Branch runners 18a, 18b, 18c, 18d Gates 20 Primary pressure means , 22... secondary pressure means, 24... movable mold, 26... fixed mold, 28... cavity, 30... injection sleeve, 32... plunger, 34... pressure pin, 36... ... first diverter runner, 38 ... rising runner, 40 ... actuator, 44 ... orifice, 46 ... annular projection, 48 ... control mechanism, 50 ... parallel runner.

Claims (13)

The molten metal is injected into the clamped mold via a plurality of branch runners by the primary pressurizing means,
Select a branch runner that communicates with the part where you want to improve the density, and provide a pressurization route that can secure a pool of hot water in the middle of this branch runner.
An orifice is provided in the pressurizing path toward the product, and a pressurizing pin for secondary pressurizing means that moves in the same direction as the flow of the molten metal in the branch runner is provided,
A die casting manufacturing method for improving the density of an intended portion by partial ultra-high pressure, characterized in that after injection by the primary pressure means is completed, pressure is applied by the pressure pin for the secondary pressure means. The molten metal is injected into the clamped mold via a plurality of branch runners and a newly set branch runner that leads to the part where the density is to be improved by the primary pressurizing means,
In the middle of this new branch runner, a pressurization route is provided in a part where a pool of hot water can be secured,
An orifice is provided in the pressurizing path toward the product, and a pressurizing pin for secondary pressurizing means that moves in the same direction as the flow of the molten metal in the branch runner is provided,
A die-casting manufacturing method for improving the density of an intended portion by partial ultra-high pressure, characterized in that runner pressurization is performed by the pressurizing pin for the secondary pressurizing means after the completion of injection by the primary pressurizing means. A single-runner mold is added with a branch runner that leads to the part where the density needs to be improved.
A pressurization path is provided in a portion where a hot water pool can be secured in the middle of the added branch runner,
An orifice is provided in the pressurizing path and a pressurizing pin for secondary pressurizing means that moves in the same direction as the flow of the molten metal in the branch runner is provided,
A die casting manufacturing method for improving the density of an intended portion by partial ultra-high pressure, characterized in that after injection by the primary pressure means is completed, pressure is applied by the pressure pin for the secondary pressure means. The molten metal is injected into the clamped mold via a plurality of branch runners by the primary pressurizing means,
Select a diverter base runner that communicates with the part where you want to improve the density, and provide a pressurization route that can secure a tundish in the middle of this branch runner.
An orifice is provided in the pressurizing path toward the product, and a pressurizing pin for secondary pressurizing means that moves in the same direction as the flow of the molten metal in the branch runner is provided,
A die casting manufacturing method for improving the density of an intended portion by partial ultra-high pressure, characterized in that after injection by the primary pressure means is completed, pressure is applied by the pressure pin for the secondary pressure means. In the secondary pressurizing means, the pressurizing pin closes the tundish pool and the metal seal formed by the minute gap between the orifice and the pressurizing pin prevents the secondary pressurizing means from applying pressure to the primary pressurizing device. Die casting for improving the density of the intended part by partial ultrahigh pressure according to any one of claims 1 to 4, which avoids transmission and enables pressurization to the product part by high pressure in the secondary pressurizing means. Production method. 5. The part according to any one of claims 1 to 4, characterized in that a control mechanism is provided to enable time setting of the start time of the secondary pressurizing means after the completion of injection by the primary pressurizing means. A die casting manufacturing method that enhances the density of the intended part by ultra-high pressure. 4. A pressurizing pin of said secondary pressurizing means attached to said branch runner and a pressurizing cylinder for driving the pressurizing pin are set on either the fixed die side or the movable die side of the mold. 10. A method of manufacturing a die casting for increasing the density of an intended part by partial ultra-high pressure according to any one of Claims 1 to 3. primary pressurizing means for injecting molten metal into the die casting mold through a plurality of branched runners;
a secondary pressurizing means that selects a part of the branch runners, is attached to the selected branch runners, and is capable of pressurizing at a pressure higher than that of the primary pressurizing means;
a control unit for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means;
an orifice formed in the pressurizing path surface of the secondary pressurizing means;
A die casting device by partial ultrahigh pressure, characterized by comprising: Primary pressurization means for injecting molten metal via a plurality of branch runners in the die casting mold and a newly installed branch runner leading to a portion where density improvement is desired;
a secondary pressurizing means attached to the new branch runner and capable of pressurizing at a pressure higher than that of the primary pressurizing means;
a control mechanism for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means;
an orifice formed in the pressurizing path surface of the secondary pressurizing means;
A die casting device by partial ultrahigh pressure, characterized by comprising: A primary pressurizing means for injecting molten metal via a single branched runner in the die casting mold and a newly installed branched runner connected to the part where the density is to be improved;
a secondary pressurizing means attached to the new branch runner and capable of pressurizing at a pressure higher than that of the primary pressurizing means;
a control mechanism for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means;
an orifice formed in the pressurizing path surface of the secondary pressurizing means;
A die casting device by partial ultrahigh pressure, characterized by comprising: primary pressurizing means for injecting molten metal into the die casting mold through a plurality of branched runners;
Select a diverter base runner in front of the branch runner that communicates with the portion to be improved in density, and attach it to the selected diverter base runner to enable the secondary pressure to be applied at a pressure higher than that of the primary pressurizing means. pressure means;
a control unit for setting a start time for operating the secondary pressurizing means after the completion of filling of the molten metal product by the primary pressurizing means;
an orifice formed in the pressurizing path surface of the secondary pressurizing means;
A die casting device by partial ultrahigh pressure, characterized by comprising: 12. A die casting apparatus using partial ultrahigh pressure according to any one of claims 8 to 11, wherein said secondary pressurizing means is provided with a pressurizing pin that moves on a parting line, that is, a contact surface between the fixed mold and the movable mold. . 12. A die casting apparatus using partial ultrahigh pressure according to claim 8, wherein said secondary pressurizing means is provided so as to be capable of pressurizing in the same direction as the clamping direction of the mold.

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