Partial ultra-high pressure die casting manufacturing method and device

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

[Technical Field]

[0001] The present invention relates to a die casting method and apparatus using partial ultra-high pressure, and in particular to a die casting method and apparatus in which a pouring pool is provided in a branched runner that serves as the molten metal inlet of a mold, an ultra-high pressure pressurizing cylinder is attached, and pressure is applied with a pressure pin connected to the cylinder, thereby improving the density of the product. [Background technology]

[0002] The casting method for die-cast products involves forcing molten metal such as aluminum into a cavity made in a mold with a plunger, and then removing the product that has solidified to a shape that matches the cavity.To prevent voids from forming when the product is formed, a method has been proposed in which the runner is further pressurized in conjunction with the pressure action of the plunger.

[0003] The runner consists of a branch runner that runs along the direction of plunger extrusion and a rising runner that is perpendicular to it. In order to locally apply pressure to the runner, a pressure pin that moves in and out of the rising runner that is directly connected to the cavity is provided, and after the plunger has completed applying pressure, the pressure pin of the runner is activated to apply further pressure (Patent Document 1).

[0004] In a technique such as that described in Patent Document 1, the molten metal forced into the cavity is already solidifying, so the runner pressurization causes the molten metal to flow back and be pushed back toward the plunger, resulting in an unsatisfactory cavity-pushing effect. From this perspective, Patent Document 2 proposes a technique 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 to provide backflow prevention and achieve a pushing effect. Generally, 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, while the gap 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 difficult to actually form such a cylindrical gap, resulting in a large gap and a necessary gap length L. As a result, even when the pressure pin is inserted under pressure, the molten metal flows back through the gap Δ, pushing back the plunger, resulting in an unsatisfactory backflow prevention effect.

[0005] In particular, in the conventional method, plunger injection is sometimes performed from multiple branch runners depending on the product shape of the cavity, and in such cases, there is a problem of a decrease in density in the part of the product injected from a specific branch runner. Furthermore, it is even more difficult when the branch runner is not connected to the part where porosity occurs or when manufacturing via a single runner. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2000-117411 [Patent Document 2] Patent Publication No. 2011-224650 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention addresses the above-mentioned problems and aims to provide a die casting manufacturing method and apparatus that, when pressurizing the runners after injecting molten metal with a plunger through multiple branch runners, applies high pressure to selected branch runner sections at a certain level to continue solidifying the molten metal, thereby producing dense die cast products and improving the density of the intended section using partial ultra-high pressure. Furthermore, by forming additional new branch runners and applying secondary pressure from these sections, dense die cast products can be produced. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention is configured as follows: That is, the die-casting method using partial ultra-high pressure according to the present invention is characterized in that it injects molten metal into a clamped mold via multiple branch runners by a primary pressurizing means, selects a branch runner that communicates with the portion where density improvement is desired, provides a pressurizing path in the middle of this branch runner where a molten metal pool can be secured, provides an orifice in the pressurizing path toward the product and provides a pressurizing pin for secondary pressurizing means that moves within the branch runner in the same direction as the flow of the molten metal, and applies pressure using the pressurizing pin for secondary pressurizing means after injection by the primary pressurizing means is complete.

[0009] Alternatively, the molten metal can be injected into the clamped mold by a primary pressure means via a plurality of branch runners and a newly set branch runner that is connected to the part where density improvement is desired, a pressure path can be set up in the middle of this new branch runner at a part where a pool of molten metal can be secured, an orifice can be set up in the pressure path heading towards the product, and a pressure pin for the secondary pressure means that moves within the branch runner in the same direction as the flow of the molten metal can be set, and after injection by the primary pressure means is complete, the runner can be pressurized by the pressure pin for the secondary pressure means.

[0010] Furthermore, a new branch runner connected to the portion where density improvement is desired can be added to a mold with a single runner structure, and molten metal can be injected into the clamped mold via the runner by a primary pressure means. A pressure path can be provided in the added branch runner at a portion where a pool of molten metal can be secured. An orifice can be provided in the pressure path, and a pressure pin for a secondary pressure means that moves within the branch runner in the same direction as the flow of the molten metal can be provided, and pressure can be applied by the pressure pin for the secondary pressure means after injection by the primary pressure means is complete.

[0011] Furthermore, it is possible to provide a die-casting manufacturing method that uses partial ultra-high pressure to improve the density of intended areas, by using a primary pressure means to inject molten metal into a clamped mold via multiple branch runners, selecting a branch flow base runner that communicates with the area where density improvement is desired, providing a pressure path in the middle of this branch runner where a pool of molten metal can be secured, providing an orifice in the pressure path toward the product, and providing a pressure pin for a secondary pressure means that moves within the branch runner in the same direction as the flow of the molten metal, and applying pressure using the pressure pin for the secondary pressure means after injection by the primary pressure means is complete.

[0012] In these cases, the secondary pressure applying means prevents the pressure from the secondary pressure applying means from being transmitted to the primary pressure applying means device part by blocking the basin with the pressure applying pin and by forming a metal seal with the minute gap between the orifice and the pressure applying pin, thereby enabling the high pressure from the secondary pressure applying means to the product part.

[0013] Furthermore, 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. Furthermore, the pressure pin of the secondary pressure means attached to the branch runner and the pressure cylinder for driving it may be set on either the fixed mold side or the movable mold side of the mold.

[0014] The ultra-high pressure die casting apparatus of the present invention is characterized by comprising: a primary pressure applying means for injecting molten metal into a die casting mold through a plurality of branch runners; a secondary pressure applying means for selecting a portion of the branch runners and attaching the selected branch runner to enable pressurization at a higher pressure than that of the primary pressure applying means; a control unit for setting a start time for operating the secondary pressure applying means after the primary pressure applying means has completed filling of the molten metal product; and an orifice formed in the pressure applying path surface of the secondary pressure applying means.

[0015] Alternatively, the die-casting mold may be configured with a primary pressurizing means for injecting molten metal through a plurality of branch runners and a newly installed branch runner connected to a portion where density improvement is desired, a secondary pressurizing means attached to the new branch runner and capable of applying a higher pressure than that of the primary pressurizing means, a control mechanism for setting the start time for operating the secondary pressurizing means after the primary pressurizing means has completed filling of the molten metal product, and an orifice formed on the pressurizing path surface of the secondary pressurizing means.

[0016] Furthermore, the die-casting mold may comprise a primary pressurizing means for injecting molten metal through a single runner and a newly installed branch runner connected to a portion where density improvement is desired, a secondary pressurizing means attached to the new branch runner and capable of applying a higher pressure than the primary pressurizing means, a control mechanism for setting a start time for operating the secondary pressurizing means after the primary pressurizing means has completed filling of the molten metal product, and an orifice formed on the pressurizing path surface of the secondary pressurizing means.

[0017] Furthermore, a partial ultra-high pressure die casting apparatus can be provided, which is characterized by comprising: a primary pressurizing means for injecting molten metal into a die casting mold through a plurality of branch runners; a secondary pressurizing means for selecting a branch flow element base runner before the branch runner that communicates with the portion to be densified and attaching it to the selected branch flow element base runner so that it can apply 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 primary pressurizing means has completed filling of the molten metal product; and an orifice formed in the pressurizing path surface of the secondary pressurizing means.

[0018] In these cases, the secondary pressure means may be provided on the fixed mold side, or may be provided so as to be capable of applying pressure along the mold clamping surface. [Effects of the Invention]

[0019] According to the above configuration, the molten metal is injected through a branch runner by a plunger as the primary pressurizing means, and then pressurized by a pressurizing pin as the secondary pressurizing means. Therefore, the gates at the cavity entrances of the runners other than the runner with the secondary pressurizing means solidify, blocking backflow. At the same time, the orifices in the pressurizing passages of the secondary pressurizing means form metal seals due to their throttling effect. Therefore, the secondary pressurizing means allows for appropriate partial ultra-high pressure pressurization. This allows for partial pressurization of the product with ultra-high pressure, eliminating porosity. In a mold, branch runners can be selected for areas where high density is desired, or new branch runners can be installed in areas where no runners are installed for the desired area. Furthermore, in a mold with a single runner, new branch runners can be installed. In this case, high-pressure injection can be reliably performed in a partial secondary pressurization, thereby enabling the production of die-cast products without porosity. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic front view of a die-cast product including a runner injected by an ultra-high pressure die-cast manufacturing apparatus according to an embodiment. FIG. [Figure 2] FIG. 2 is a schematic side view of FIG. [Figure 3] FIG. 10 is a cross-sectional view of a secondary pressure means attached to a branch runner portion. [Figure 4] FIG. 10 is a schematic front view of a die-cast product including a runner injected by an ultra-high pressure die-cast manufacturing apparatus according to another embodiment. [Figure 5] FIG. 5 is a schematic side view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] A method and apparatus for manufacturing a die-cast product using partial ultra-high pressure according to an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the following description is merely one embodiment, and various modifications may be made to the present invention as long as they do not deviate from the spirit of the present invention.

[0022] 1 and 2 show a die-cast product manufactured by the partial ultra-high pressure die-casting manufacturing apparatus of this embodiment, a schematic front view and a schematic side view showing the branched runners leading to the product, and the mounting position of the ultra-high pressure pressurizing cylinder attached to that particular branched runner. As shown in these figures, the die-cast product 10 has a biscuit 12 extruded from the plunger side at its front end, a runner that serves as a passage from the biscuit 12 to the cavity that bends and rises upward (diverter base runner 14), and further branches to form multiple runners (four in the illustrated example) (branched runners 16a, 16b, 16c, 16d), which open at four locations on the die-cast product 10 via gates 18a, 18b, 18c, 18d.

[0023] Because there was a problem that the molten metal injected from the left branch runner 16a shown in Figure 1 was prone to generating cavities when solidifying inside the product, this branch runner 16a was selected as the runner connected to the intended product part, and after the amount of molten metal required for the die-cast product 10 was injected by the primary pressure means 20 (see Figure 2), secondary pressure was applied at an ultra-high pressure approximately four times that of the primary pressure by the secondary pressure means 22 (see Figure 3) provided on the selected branch runner 16a.

[0024] 2 and 3, the primary pressure applying means 20 and secondary pressure applying means 22 will be described. The die-casting manufacturing apparatus comprises a movable mold 24 attached to a movable platen and a fixed mold 26 attached to a fixed platen, and molten metal is injected into a cavity 28 formed by clamping together the molds 24, 26, to produce a die-cast product 10 having a shape that conforms to the cavity 28. The product 10 can be removed from the cavity 28 by separating the molds 24, 26 and operating an ejector pin provided on the back surface of the movable mold 24.

[0025] In order to supply molten metal to the cavity 28 of such a die-casting manufacturing device, a molten metal supply means is disposed below the cavity 28 as the injection section of the primary pressurizing means 20. As shown in Figure 2, the primary pressurizing means 20 is composed of an injection sleeve 30 that is attached by penetrating horizontally through the fixed platen and reaches the fixed mold 26, a plunger 32 disposed within the injection sleeve 30, and a pressurizing device (not shown) that is located behind the plunger 32 and can push and pull the plunger 32.

[0026] A runner is formed above the front end of the injection sleeve 30 as a passageway leading to the cavity 28. This is composed of a diverter base runner 14 before branching and four branch runners 16a, 16b, 16c, and 16d, and the molten metal is injected into the cavity 28 through the subsequent gates 18a, 18b, 18c, and 18d to form the die-cast product 10. Let us now assume that this die-cast product 10 has a problem in that many porosity occurs in the part of the product injected from the branch runner 16a at the left end in Figure 1.

[0027] Therefore, this branch runner 16a is selected, and secondary pressure is applied to the selected branch runner 16a. In this embodiment, the secondary pressure applying means 22 is disposed on the clamping surface of the mold as shown in Figure 3, and the operating direction of the pressure applying pin 34 constituting the secondary pressure applying means 22 is set to be an upward direction perpendicular to the extrusion direction of the plunger 28.

[0028] 3, the selective branch runner 16a has a curved shape consisting of a first diverter runner 36 that branches off from the diverter base runner 14, which extends almost vertically from the injection sleeve 30, turns diagonally upward, and a rising runner 38 that continues vertically. The rising runner 38 turns upward to ultimately connect directly to the bottom of the cavity 28, and the molten metal extruded by the plunger 32 passes through the diverter base runner 14, turns upward by the rising runner 38, and is injected and sprayed from the gate 18a into the cavity 28. The stroke of the pressure pin 34 in the rising runner 38 of the selective branch runner 16a forms a molten metal pool required for secondary pressure application.

[0029] The first branch runner 36 of this branch runner 16a is provided with a secondary pressurizing means 22 that secondarily pressurizes the molten metal in the cavity 28. The secondary pressurizing means 22 is provided along the mold clamping surface and is composed of a lower actuator 40 and a pressurizing pin 34 that is attached so as to move in and out along the rising runner 38 (pressurizing path) by the actuator 40. The diameter d of the pressurizing pin 34 is smaller than the inner diameter D of the rising runner 38, allowing the pressurizing pin 34 to slide up and down on the rising runner 38. Therefore, the amount of pressure that the pressurizing pin 34 presses into the rising runner 38 (the amount of molten metal that it displaces) improves the density of the product formed by the cavity 28.

[0030] In this embodiment, an orifice 44 is formed on the selected branch runner 16a, particularly at the intersection (section AB in FIG. 3 ) between the first diverter runner 36 and the rising runner 38, closer to the first diverter runner 36 (section B in FIG. 3 ). This orifice 44 is an annular protrusion 46 with a rectangular cross section formed on the inner diameter of the rising runner 38. The height of the annular protrusion 46 is adjusted as closely as possible to the outer diameter d of the pressure pin 34 to create a metal seal. Specifically, although this depends on the size of the cavity 28, empirically, the gap between the pressure pin 34 and the annular protrusion 46 on the rising runner 38 is preferably about 1 mm, which provides a metal seal due to solidification of the molten metal. While this optimal value varies depending on the axial length of the annular protrusion 46, the mold shape, the injection pressure, and the injection speed, it is often approximately 0.5 mm to 1.0 mm on average. Furthermore, the axial length L of the annular protrusion 46 is often about 10 mm on average to obtain a high metal seal effect, but this varies depending on the mold shape, injection pressure, speed, etc. These factors ensure that the metal seal is performed reliably.

[0031] In the secondary pressurizing means 22 configured in this manner, after injection by the plunger 32 of the primary pressurizing means 20 is completed, when the pressurizing pin 34 approaches the annular protrusion 46, the molten metal from above enters the orifice 44 portion, forming a metal seal, which performs a shielding function. Therefore, the metal seal at the orifice 44 increases the amount of molten metal filled into the cavity 28, and the pushing action of the pressurizing pin 34 lengthens the stroke, completing the operation.

[0032] 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 using the control mechanism 48. In this embodiment, the secondary pressurizing means 22 is started approximately 0.1 seconds after completion of injection by the primary pressurizing means. While the optimum value for this delay time varies on the order of milliseconds depending on various conditions, such as the mold shape, first pressurizing pressure, and pressurizing speed, some trial and error is required. However, the time setting of this device can be set on the order of milliseconds. This time setting utilizes the metal seal at the injection ports of the non-selected branch runners 16b, 16c, and 16d, which are not equipped with the secondary pressurizing means 22. The molten metal solidifies when it comes into contact with the mold, while the remaining areas are in a semi-solidified state. Therefore, by achieving a metal seal at the non-selected branch runners 16b, 16c, and 16d and at the orifice 44, it is possible to apply an ultra-high pressure (approximately 250 MPa) to the partial pressurization by the secondary pressurizing means 22. In other words, it is possible to apply a partial pressurization pressure approximately four times that of the primary pressurizing means 20.

[0033] The annular protrusion 46 forming the orifice 44 may have a rectangular cross section as in the embodiment, but it may also have a V-shaped or arc-shaped cross section. In this case, if the tip of the V-shaped or arc-shaped protrusion is sharp, it will be difficult to remove the metal seal, so it is desirable to have a shape with the tip cut off.

[0034] Furthermore, a cooling means can be placed on the annular protrusion 46 that forms the orifice 44. This can be a horizontal water-cooled type or an oil-cooled type, and it is advisable to cool the annular protrusion 46 when injection by the primary pressure means 20 is completed and pressure by the secondary pressure means 22 is applied to the annular protrusion 46. This makes it easier to form a metal seal.

[0035] In the above embodiment, the annular protrusion 46 that forms the orifice 44 may be formed as a separate part and attached by a fitting structure when the runner 16a is formed. This is because the runner 16a is structured to split vertically along the parting line of the mold, making it easy to attach to the rising runner 38 that has a semicircular structure.

[0036] The above embodiment can also be applied to pushing a runner in a hot chamber and when molding plastics.

[0037] According to this embodiment, injection into the cavity 28 is performed by the primary pressurizing means 20, and the secondary pressurizing means 22 is activated a short time after the runner 16a is filled with molten metal. The pressurizing pin 34 performs a normal extrusion action while reaching the intersection (FIG. 3A-B) of the first branch runner portion 36 and the rising runner 38. However, as soon as the first branch runner 36 breaks and reaches the orifice 44, the annular protrusion 46 reaches the gap δ, where the molten metal solidifies due to the metal seal, shutting off the pressure. At this time, the injection ports of the non-branch selection b runners 16b-16d are in a solidified state, blocking their openings. Therefore, the unsolidified molten metal in the runners on the cavity 28 side, located above the pressurizing pin 42, is forced toward the cavity 28 against the backdrop of the shutoff pressure.

[0038] This allows the pressure pin 34 to advance further than with a conventional stroke, and the secondary pressure means 22 makes it possible to manufacture a product that is locally stronger and denser. The effect of this is that when molten metal is filled into a cavity 28 of the same volume, the weight increases by 1.7%, which is an astonishing value in this industry.

[0039] In the above embodiment, the secondary pressure means 22 is positioned along the direction perpendicular to the plunger stroke (mold clamping surface). However, the secondary pressure means 22 may also be positioned so as to apply pressure along the fixed mold 26 side. This second embodiment is shown in Figures 4 and 5. In this example, the product portion 33 is flat, so the mold clamping line is perpendicular to the plate surface. The plunger 32, which is the primary pressure means 20, is configured to move from the front to the back in the figure, and is pushed out into the die-cast product 10 via paths from four branch runners 16a, 16b, 16c, and 16d. The secondary pressure means 22, which is activated after the primary pressure means 20 has completed ejection, forms a runner section in the selected branch runner 16a that is parallel to the direction of plunger 32 movement. The secondary pressure means 22 is attached to this parallel runner 50 and applies 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 through it. The secondary pressurizing means 22 also starts applying pressure a little later than the completion of injection by the primary pressurizing means 20, and is configured to operate after a delay time set in the control mechanism 48. This makes it possible for the secondary pressurizing means 22 to apply a partial ultra-high pressure (250 MPa).

[0040] In the example shown in Figures 4 and 5, the secondary pressure means 22 is attached with the pressure pin 34 together with the actuator 40 inside the fixed mold, but if this does not fit, the actuator 40 may be extended and placed on the fixed platen side.

[0041] Furthermore, in the above embodiment, it is assumed that the product has branch runners 16a to 16d from the beginning, but if a relatively large number of new porosity are found in the product apart from the branch runner portions, a new branch runner may be provided toward that location, and this new runner portion may be subjected to a partial pressure (about 250 MPa) higher than the plunger pressure (about 70 MPa) by the secondary pressure means 22. Furthermore, in the case of a mold that forms a product with a single runner, it is also possible to partially prevent the formation of porosity by forming a new runner portion and providing the secondary pressure means 22 there, making it possible to respond in detail to each product.

[0042] Furthermore, if there are multiple branch runners leading to the location where it is desired to increase the density, they can be grouped together into a branch base runner, and secondary pressure means can be provided on this branch base runner, which can then apply secondary pressure to the multiple branch runners. [Industrial Applicability]

[0043] The present invention provides a method and apparatus for die casting production that allows for plunger pressure as a primary pressure means, followed by the use of a selected or new runner as a secondary pressure means to apply pressure to areas that require strength, thereby improving product density. [Explanation of symbols]

[0044] 10...Die-cast product, 12...Biscuit, 14...Diverter base runner, 16a, 16b, 16c, 16d...Branch runners, 18a, 18b, 18c, 18d...Gate, 20...Primary pressure means, 22...Secondary pressure means, 24...Moveable 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 protrusion, 48...Control mechanism, 50...Parallel runner.

Claims

1. Molten metal is injected into the clamped mold via a plurality of branched runners by a primary pressure means, A branch runner is selected that is connected to the part where density improvement is desired, and a pressurization path is provided in the middle of this branch runner so that a pouring pool can be secured. An orifice is provided in the pressure path directed toward the product, and a pressure pin for a secondary pressure means is provided which moves in the branch runner in the same direction as the flow of the molten metal, A minute gap is formed between the orifice and the pressure pin, thereby enabling a metal seal to be formed, A die casting manufacturing method for improving the density of a desired part by applying a partial ultra-high pressure, characterized in that pressure is applied by a pressure pin for the secondary pressure means after completion of injection by the primary pressure means.

2. Molten metal is injected into the clamped mold by a primary pressure means via multiple branch runners and a newly set branch runner that is connected to the part where density improvement is desired, A pressurized path is provided in the middle of this new branch runner where a pouring pool can be secured. An orifice is provided in the pressure path directed toward the product, and a pressure pin for a secondary pressure means is provided which moves in the branch runner in the same direction as the flow of the molten metal, A minute gap is formed between the orifice and the pressure pin, thereby enabling a metal seal to be formed, A die casting manufacturing method for improving the density of intended parts by applying local ultra-high pressure, characterized in that after completion of injection by the primary pressure means, runner pressure is applied by the pressure pin for the secondary pressure means.

3. A branch runner is newly added to a mold with a single runner structure, which connects to the area where density improvement is desired, and molten metal is injected into the clamped mold via the runner using a primary pressure means. A pressurizing path is provided in a portion of the added branch runner where a pouring basin can be secured, an orifice is provided in the pressurizing path, and a pressurizing pin for a secondary pressurizing means is provided which moves in the branch runner in the same direction as the flow of the molten metal; A minute gap is formed between the orifice and the pressure pin, thereby enabling a metal seal to be formed, A die casting manufacturing method for improving the density of a desired part by applying a partial ultra-high pressure, characterized in that pressure is applied by a pressure pin for the secondary pressure means after completion of injection by the primary pressure means.

4. Molten metal is injected into the clamped mold via a plurality of branched runners by a primary pressure means, A branch runner base section that is connected to the area where density improvement is desired is selected, and a pressurization path is provided in the middle of this branch runner, where a pouring pool can be secured. An orifice is provided in the pressure path directed toward the product, and a pressure pin for a secondary pressure means is provided which moves in the branch runner in the same direction as the flow of the molten metal, A minute gap is formed between the orifice and the pressure pin, thereby enabling a metal seal to be formed, A die casting manufacturing method for improving the density of a desired part by applying a partial ultra-high pressure, characterized in that pressure is applied by a pressure pin for the secondary pressure means after completion of injection by the primary pressure means.

5. The secondary pressurizing means prevents the pressure from the secondary pressurizing means from being transmitted to the primary pressurizing means device by blocking the basin with a pressurizing pin and by forming a metal seal with a minute gap between the orifice and the pressurizing pin, thereby enabling the secondary pressurizing means to apply high pressure to the product portion. This is a die casting manufacturing method for improving the density of intended portions by applying partial ultra-high pressure as described in any one of claims 1 to 4.

6. 5. A die casting manufacturing method for improving the density of a desired part by applying local ultra-high pressure according to any one of claims 1 to 4, characterized in that a control mechanism is provided to set the start time of the secondary pressurizing means after completion of injection by the primary pressurizing means.

7. 5. A die casting manufacturing method for improving the density of an intended part by applying local ultra-high pressure according to any one of claims 1 to 4, characterized in that the pressure pin of the secondary pressure means attached to the branch runner and its driving pressure cylinder are set on either the fixed mold side or the movable mold side of the die.

8. a primary pressurizing means for injecting molten metal into a die-casting mold through a plurality of branched runners; a secondary pressurizing means for selecting a part of the branch runners and attaching it to the selected branch runner, and for applying a pressure higher than that of the primary pressurizing means; a control unit that sets a start time for operating the secondary pressurizing means after the filling of the molten metal product by the primary pressurizing means is completed; an orifice formed on a pressure path surface of the secondary pressure means; It consists of A die casting device using partial ultra-high pressure, characterized in that a metal seal can be formed by leaving a minute gap between the orifice and the pressure pin of the secondary pressure means.

9. a primary pressurizing means for injecting molten metal into a die-casting mold via a plurality of branch runners and a newly installed branch runner connected to a portion where density improvement is desired; a secondary pressurizing means attached to the new branch runner and capable of applying 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 on a pressure path surface of the secondary pressure means; It consists of A die casting device using partial ultra-high pressure, characterized in that a metal seal can be formed by leaving a minute gap between the orifice and the pressure pin of the secondary pressure means.

10. a primary pressurizing means for injecting molten metal into a die-casting mold via a single branch runner and a newly installed branch runner connected to a portion where density improvement is desired; a secondary pressurizing means attached to the new branch runner and capable of applying 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 on a pressure path surface of the secondary pressure means; It consists of A die casting device using partial ultra-high pressure, characterized in that a metal seal can be formed by leaving a minute gap between the orifice and the pressure pin of the secondary pressure means.

11. a primary pressurizing means for injecting molten metal into a die-casting mold through a plurality of branched runners; a secondary pressurizing means for selecting a diverter base runner located before a branch runner that is connected to a portion where density improvement is desired, and for attaching the selected diverter base runner to the runner so as to be able to apply a pressure higher than that of the primary pressurizing means; a control unit that sets a start time for operating the secondary pressurizing means after the filling of the molten metal product by the primary pressurizing means is completed; an orifice formed on a pressure path surface of the secondary pressure means; It consists of A die casting device using partial ultra-high pressure, characterized in that a metal seal can be formed by leaving a minute gap between the orifice and the pressure pin of the secondary pressure means.

12. 12. The partial ultra-high pressure die casting apparatus according to claim 8, wherein the secondary pressure means comprises a pressure pin that moves on the parting line, i.e., the contact surface, of the fixed die and the movable die.

13. 12. The die casting apparatus using partial ultra-high pressure according to claim 8, wherein the secondary pressure means is provided so as to be able to apply pressure in the same direction as the mold clamping direction.

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