Injection device of die casting machine

Abstract

An injection device (D) of a die casting machine according to the present disclosure is provided with: a gooseneck section (20) immersed in a molten metal (M); and a substantially cylindrical sleeve (30, 40) which is disposed inside the gooseneck section, has an inflow port through which the molten metal flows in formed therein, and has an inner wall surface forming a first flow path (F1) into which a plunger for pressurizing the molten metal is inserted. A second flow path (F2) which communicates from the outflow end side of the first flow path (F1) to the injection port side for injecting the molten metal into the mold, and a holding part (22) which surrounds the outer peripheral surface of the sleeve (30, 40) and holds the sleeve in a manner of abutting against the outer peripheral surface are formed in the gooseneck part (20), the sleeve (30, 40) is made of ceramic, and the gooseneck part (20) is made of metal with aluminum melting loss resistance.

Description

[0001] <Citation of the basic application> This invention claims the benefit of priority based on the patent application of Japanese Patent Application No. 2024-003130 filed in Japan on January 12, 2024, and all the content disclosed in this patent application is incorporated in this specification. Technical Field

[0002] This disclosure relates to an injection device of a die-casting machine. Background Art

[0003] As a device for forming alloys such as aluminum, magnesium, and zinc, there is a die-casting machine. Moreover, there is a hot-chamber die-casting machine in which an injection device for injecting molten metal into a mold is immersed in the molten metal.

[0004] Here, Figure 1 An injection device 100 in a hot-chamber die-casting machine disclosed in Patent Document 1 is shown. The injection device 100 in Patent Document 1 includes a gooseneck 1 immersed in molten aluminum alloy, and a flow path for molten metal to be injected into the mold is formed in the gooseneck 1. Specifically, a relatively wide first flow path ( Figure 1 the flow path extending in the vertical direction on the right side) for molten metal to flow in is formed in the gooseneck 1, and a relatively narrow second flow path ( Figure 1 the flow path extending in the vertical direction on the left side) formed by an outflow hole 7 communicating with a nozzle mounting port 8 for molten metal to flow out is formed.

[0005] Moreover, in the injection device 100 of Patent Document 1, a substantially cylindrical sleeve 11 formed by an inner wall surface to form the flow path itself and to form a guide for a plunger is provided in the first flow path on the inflow side of the gooseneck 1, and further, a substantially cylindrical bracket 13 configured to surround the outer side of the sleeve 11 is provided on the outer peripheral side of the sleeve 11. Moreover, the bracket 13 is connected to the lower end of the sleeve 11, and the first flow path is formed by the wall surfaces of the sleeve 11 and the bracket 13. At this time, the sleeve 11 is made of ceramic, and the bracket 13 is made of a metal having aluminum melt loss resistance.

[0006] Prior Art Documents Patent Documents Patent Document 1 Japanese Patent No. 6408328 Gazette Summary of the Invention Problems to be Solved by the Invention However, in the technique described in the above Patent Document 1, in the first flow path, since the sleeve 11 and the bracket 13 are connected, at the above connection position, the bracket 13 may be melted by the molten metal flowing in the first flow path. Therefore, the following problems occur: the durability of the injection device is reduced, and it is necessary to frequently replace parts, etc., which incurs part costs and operation costs.

[0007] Accordingly, an object of the present disclosure is to provide an injection device for a die casting machine that can achieve an improvement in durability and suppress component costs and operation costs.

[0008] Means for Solving the Problem An injection device for a die casting machine according to an aspect of the present disclosure is configured to include: A gooseneck portion immersed in molten metal; A substantially cylindrical sleeve disposed inside the gooseneck portion, having an inlet through which molten metal flows in, and having a first flow path formed by an inner wall surface into which a plunger for pressurizing the molten metal is inserted. A second flow path communicating from the outflow end side of the first flow path toward an injection port for injecting molten metal into a mold and a holding portion surrounding an outer peripheral surface of the sleeve and holding the sleeve in contact with the outer peripheral surface are formed inside the gooseneck portion. The sleeve is made of ceramic, and the gooseneck portion is made of a metal having aluminum melt loss resistance.

[0009] Effects of the Invention With the present disclosure configured as described above, it is possible to achieve an improvement in durability and suppress component costs and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a diagram showing the structure of an injection device for a die casting machine according to the background art related to the present disclosure.

[0011] Figure 2 is a diagram showing the structure of an injection device for a die casting machine according to the present disclosure.

[0012] Figure 3 is an enlarged view of a part of the injection device for a die casting machine according to the present disclosure.

[0013] Figure 4 is an enlarged view of a part of the injection device for a die casting machine according to the present disclosure. DETAILED DESCRIPTION

[0014] <First Embodiment> A first embodiment of the present disclosure will be described with reference to the drawings. In addition, the drawings may be related to any embodiment.

[0015] [Structure] The injection device for a die casting machine in the present embodiment is a hot chamber type. Figure 2 A cross-sectional view showing a part of the structure of the injection device D for a die casting machine. As Figure 2As shown, the injection device D is arranged in a state where a part of it is immersed in the molten metal M of the aluminum alloy deposited in the ladle P. In addition, the injection device of the die-casting machine in the present embodiment can also be applied to the molten metal of any alloy.

[0016] The injection device D includes a gooseneck 20 immersed in the molten metal M. The gooseneck 20 is made of a metal with aluminum melt loss resistance. Here, Figure 3 shows an enlarged view of the gooseneck 20. As Figure 2 , Figure 3 shown, a receiving portion 21 (the hollow position on the right side of Figure 3 ) for arranging the sleeve units 30 and 40 and forming the first flow path F1 is mainly formed inside the gooseneck 20 as described later, a hollow position existing side by side with the receiving portion 21, that is, the second flow path F2 (the hollow position on the left side of Figure 3 ), and a hollow position communicating with the receiving portion 21 and the second flow path F2, that is, the third flow path F3 (the hollow position on the lower side of Figure 3 ).

[0017] The receiving portion 21 of the gooseneck 20 is formed by a hollow region having a substantially cylindrical shape with a specified length. One end side above Figure 2 opens to the outside, and the other end side below Figure 2 communicates with the third flow path F3. Moreover, a holding portion 22 having an inner diameter formed smaller than other positions above is formed in the receiving portion 21 in the length direction from a specified position to a position near the other end. In addition, an inflow hole 21a penetrating the side wall is formed in the side wall of the receiving portion 21 on the end side closer to the end than the position where the holding portion 22 is formed. Therefore, the molten metal M flows into the receiving portion 21 of the gooseneck 20 from the inflow hole 21a.

[0018] The sleeve units 30 and 40 are arranged in the holding portion 22 formed in the receiving portion 21. The sleeve units 30 and 40 are configured such that the main sleeve 30 (the first sleeve) arranged at one end side, that is, above, of the receiving portion 21 is connected to the sleeve 40 (the second sleeve) arranged at the other end side, that is, below, of the receiving portion 21. The main sleeve 30 and the sleeve 40 are made of ceramic. In addition, the sleeve units 30 and 40 are pressed from above toward the holding portion 22 side by a sleeve pressing member 60 and a pressing cover 70.

[0019] The main sleeve 30 is formed in a substantially cylindrical shape with a predetermined length, and the outer peripheral surface thereof is held by the holding portion 22 in a manner that abuts against the holding portion 22. Moreover, the inner diameter of the main sleeve 30 is formed to be substantially constant along the long side direction. In addition, an inlet 31 penetrating the side wall is formed in the side wall of the main sleeve 30. The inlet 31 is formed, for example, near the position of the inlet hole 21a formed in the accommodating portion 21 of the above-mentioned gooseneck portion 20. Thus, the molten metal M flowing into the accommodating portion 21 from the inlet hole 21a flows into the cylindrical interior of the main sleeve 30 through the inlet 31 of the main sleeve 30. In this way, as shown by the arrow Y1 in Figure 2 Figure 2 , 3 , a first flow path F1 for the molten metal M to flow from the upper side as one end side toward the lower side as the other end side along the length direction is formed inside the main sleeve 30. In addition, a plunger 50 for pressurizing the molten metal M is inserted into the main sleeve 30 from one end side.

[0020] The sleeve 40 is connected to abut against the other end of the main sleeve 30. The sleeve 40 is formed in a substantially cylindrical shape with a predetermined length shorter than that of the main sleeve 30, and the outer peripheral surface thereof is held by the holding portion 22 in a manner that abuts against the holding portion 22. Specifically, the sleeve 40 is formed such that the outer diameter is different between the one end side portion ( Figure 3 the upper side portion) and the other end side portion ( Figure 3 the lower side portion) in the long side direction. Moreover, the outer diameter of the one end side portion of the sleeve 40 is formed to be substantially the same as or slightly larger than the inner diameter of the main sleeve 30, and the outer diameter of the other end side portion is formed to be smaller than the outer diameter of the one end side portion. In addition, the inner diameter of the one end side portion of the sleeve 40 is formed such that the inner diameter at the other end is smaller than the inner diameter near the connection position with the main sleeve 30. Specifically, as shown in Figure 3 Figure 3 , the inner diameter 41 of the one end side portion of the sleeve 40 is formed in a tapered shape that slopes gradually smaller from the connection position with the main sleeve 30 toward the other end side. On the other hand, the inner diameter of the other end side portion of the sleeve 40 is formed to have a substantially constant diameter.

[0021] The interior of the sleeve 40 is formed with the above-mentioned inner diameter and is in communication with the interior of the main sleeve 30. In other words, the interior of the main sleeve 30 and the interior of the sleeve 40 form a series of first flow paths F1 for the molten metal M to flow. Therefore, the vicinity of the other end of the sleeve 40 becomes the outflow end F1e of the first flow path F1.

[0022] Here, Figure 4 is an enlarged view showing the connection position between the main sleeve 30 and the sleeve 40, and the structure of the above-mentioned connection position will be described. As shown in Figure 4 Figure 4As shown by the reference numeral R1 in the drawings, near the connection position, the side walls of the main sleeve 30 and the sleeve 40 are configured such that the wall surfaces overlap along the long side direction with each other, and are in contact with and connected to each other. Specifically, the sleeve 40 is inserted into the inside of the main sleeve 30, whereby the inner wall surface of the main sleeve 30 and the outer wall surface of the sleeve 40 are in contact with and connected to each other. At this time, the outer diameter of the sleeve 40 near the connection position is formed to be smaller than the inner diameter of the main sleeve 30, and the portion where the outer diameter of the sleeve 40 is formed to be smaller is connected in a state of being inserted into the inside of the main sleeve 30.

[0023] In addition, according to the above structure, as Figure 4 shown by the reference numeral R2 in the drawings, a stepped surface is formed at the position where the outer diameter of the sleeve 40 inserted into the inside of the main sleeve 30 is smaller, and the other end surface of the main sleeve 30 abuts against the above stepped surface. In other words, the surface formed at the other end of the main sleeve 30 in the direction of the outflow end F1e of the first flow path F1 faces and abuts against the stepped surface of the sleeve 40 in the opposite direction.

[0024] In addition, at the connection position, the side wall at the end position of the main sleeve 30 into which the sleeve 40 is inserted is formed to have a smaller outer diameter and a thinner thickness. Thus, as Figure 4 shown by the reference numeral 32 in the drawings, a stepped surface is formed on the outer peripheral surface at the end position of the main sleeve 30 in the direction of the outflow end F1e of the first flow path F1. In addition, as Figure 4 shown by the reference numeral 42 in the drawings, a stepped surface is also formed on the outer peripheral surface between the one end side portion and the other end side portion of the above sleeve 40 in the direction of the outflow end F1e of the first flow path F1.

[0025] Moreover, the holding portion 22 of the gooseneck portion 20 that holds the main sleeve 30 and the sleeve 40 is configured to have an inner surface that abuts against the outer peripheral surfaces of the main sleeve 30 and the sleeve 40 corresponding to the shapes of the outer peripheral surfaces. For example, the holding portion 22 is formed to have abutting surfaces that face and abut against the stepped surfaces 32 and 42 formed on the outer peripheral surfaces of the main sleeve 30 and the sleeve 40, respectively. In addition, the holding portion 22 abuts against all positions of the outer peripheral surfaces of the main sleeve 30 and the sleeve 40 without gaps and holds them.

[0026] In addition, as Figure 3As shown, inside the goose neck 20, there are formed a third flow path F3 and a second flow path F2 that extend from the first flow path F1 and communicate with the first flow path F1 formed by the sleeve units 30 and 40 arranged in the housing part 21 as described above. Specifically, the third flow path F3 is formed to bend and extend from the outflow end F1e of the first flow path F1 at a substantially right angle with respect to the long side direction of the first flow path F1, and is formed to have substantially the same inner diameter as the outflow end F1e of the first flow path F1. Moreover, the second flow path F2 is further formed to bend and extend from the end of the third flow path F3 at a substantially right angle, and is formed to have substantially the same inner diameter as the third flow path F3. Therefore, as Figure 3 shown, the second flow path F2 exists side by side with the first flow path F1. In other words, the long side direction of the second flow path F2 is substantially parallel to the long side direction of the first flow path F1. As shown by the arrow Y2 in Figure 3 , the flow direction of the molten metal M flowing inside the second flow path F2 is opposite to the flow direction Y1 inside the first flow path F1. In addition, the end F2e side that becomes the outflow destination of the second flow path F2 is further bent and extended toward the injection port for injecting the molten metal M into the mold. Furthermore, the above-mentioned third flow path F3 and the second flow path F2 preferably form the inner wall surface into a curved surface at the position where the flow path bends. Thereby, the flow of the molten metal M inside the flow path becomes smooth.

[0027] As described above, the injection device D of the die-casting machine in the present embodiment is a part that allows the molten metal M to flow into the goose neck 20 and pressurizes it, and the sleeve units 30 and 40 made of ceramics form a part where the amount of the molten metal M is large and the flow is intense. Therefore, it is possible to suppress the melting loss caused by the molten metal M in the above-mentioned part, and thus it is possible to improve the durability of the injection device D. In addition, thereby, it is not necessary to frequently replace parts, and it is possible to reduce the part cost and the operation cost.

[0028] In addition, the sleeve units 30 and 40 are composed of the main sleeve 30 and the sleeve 40, whereby it becomes easy to form the shape of the sleeve through which a desired amount of the molten metal M can flow. In particular, by forming the sleeve 40 that reduces the amount of the molten metal M from ceramics, it is possible to improve the durability of the part that is easily melted.

[0029] In addition, at the connection position of the main sleeve 30 and the sleeve 40, the side walls are overlapped and connected to each other, or a stepped surface is formed on the outer peripheral surface and abutted against the holding part 22 of the goose neck 20 using the above-mentioned stepped surface. Thereby, it is possible to effectively suppress the leakage of the molten metal M at the connection position of the main sleeve 30 and the sleeve 40, and thus it is possible to suppress the melting loss of the goose neck 20.

[0030] As described above, the present disclosure has been described with reference to the above-described embodiments and the like, but the present disclosure is not limited to the above-described embodiments. The structure and details of the present disclosure can be variously changed within the scope of the present disclosure by those skilled in the art. Moreover, the above-described embodiments can be appropriately combined with other embodiments.

[0031] <Supplementary Note> Part or all of the above-described embodiments can also be described as in the following supplementary note. Hereinafter, an outline of the structure of the injection device of the die casting machine of the present disclosure will be described. Note that the present disclosure is not limited to the following structure.

[0032] (Supplementary Note 1) An injection device for a die casting machine, comprising: A gooseneck immersed in molten metal; and A substantially cylindrical sleeve disposed inside the gooseneck, having an inlet through which molten metal flows in, and a first flow path formed by the inner wall surface for inserting a plunger for pressurizing the molten metal. A second flow path communicating from the outflow end side of the first flow path toward the injection port for injecting molten metal into the mold is formed inside the gooseneck, and a holding portion that surrounds the outer peripheral surface of the sleeve and holds the sleeve in contact with the outer peripheral surface is provided. The sleeve is made of ceramic, and the gooseneck is made of a metal having aluminum melt loss resistance.

[0033] (Supplementary Note 2) The injection device for a die casting machine according to Supplementary Note 1, wherein The sleeve is composed of a substantially cylindrical first sleeve having the inlet formed therein and an inner diameter formed to be substantially constant, and a substantially cylindrical second sleeve located on the outflow end side of the first flow path and connected to the end of the first sleeve.

[0034] (Supplementary Note 3) The injection device for a die casting machine according to Supplementary Note 2, wherein The inner diameter of the second sleeve is formed to be smaller near the outflow end of the first flow path than near the connection position with the first sleeve.

[0035] (Supplementary Note 4) The injection device for a die casting machine according to Supplementary Note 2, wherein The inner diameter of at least a part of the second sleeve gradually decreases from the connection position with the first sleeve toward the outflow end of the first flow path.

[0036] (Supplementary Note 5) The injection device for a die casting machine according to Supplementary Note 2, wherein The side wall of the first sleeve and the side wall of the second sleeve are abutted and connected to each other in such a way that their wall surfaces overlap at the connection position.

[0037] (Supplementary Note 6) The injection device of a die-casting machine according to Supplementary Note 2, wherein the first sleeve and the second sleeve are abutted against each other at the connection position, the holding portion of the gooseneck holds the first sleeve and the second sleeve in a manner that abuts against the outer peripheral surfaces of the first sleeve and the second sleeve.

[0038] (Supplementary Note 7) The injection device of a die-casting machine according to Supplementary Note 6, wherein step-difference surfaces are formed on the outer peripheral surfaces of the first sleeve and the second sleeve respectively, in the direction of the outflow end of the first flow path, the holding portion of the gooseneck has a surface that faces and abuts against the step-difference surface.

[0039] (Supplementary Note 8) The injection device of a die-casting machine according to Supplementary Note 6, wherein at the connection position of the first sleeve and the second sleeve, surfaces are formed that face and abut against each other in directions opposite to each other in the direction of the outflow end of the first flow path.

[0040] Symbol Explanation: D Injection device; P Pot; M Molten metal; 20 Gooseneck; 21 Receiving portion; 21a Inflow hole; 22 Holding portion; 30 Main sleeve; 31 Inlet; 32 Step-difference surface; 40 Sleeve; 42 Step-difference surface; 50 Plunger; 60 Sleeve pressing member; 70 Pressing cover; F1 First flow path; F2 Second flow path; F3 Third flow path.

Claims

1. An injection device of a die-casting machine, characterized in that, Comprising: A gooseneck portion immersed in molten metal; and A generally cylindrical sleeve disposed inside the gooseneck portion, having an inlet through which molten metal flows in, and having a first flow path formed by an inner wall surface for inserting a plunger for pressurizing the molten metal, A second flow path communicating from the outflow end side of the first flow path toward the injection port side for injecting the molten metal into the mold is formed inside the gooseneck portion, and a holding portion that surrounds the outer peripheral surface of the sleeve and holds the sleeve in contact with the outer peripheral surface, The sleeve is made of ceramic, and the gooseneck portion is made of a metal having aluminum melt loss resistance.

2. The injection device of a die casting machine according to claim 1, wherein The sleeve is composed of a generally cylindrical first sleeve having the inlet formed therein and an inner diameter formed to be substantially constant, and a generally cylindrical second sleeve located on the outflow end side of the first flow path and connected to an end of the first sleeve.

3. The injection device of a die casting machine according to claim 2, wherein The second sleeve is formed such that the inner diameter near the outflow end of the first flow path is smaller than the inner diameter near the connection position with the first sleeve.

4. The injection device of a die casting machine according to claim 2, wherein The second sleeve is formed such that the inner diameter of at least a part thereof gradually decreases from the connection position with the first sleeve toward the outflow end of the first flow path.

5. The injection device of a die casting machine according to claim 2, wherein The side wall of the first sleeve and the side wall of the second sleeve are in contact with and connected to each other such that the wall surfaces overlap at the connection position.

6. The injection device of a die casting machine according to claim 2, wherein The first sleeve and the second sleeve are in contact with each other at the connection position, The holding portion of the gooseneck portion holds the first sleeve and the second sleeve in contact with the outer peripheral surfaces of the first sleeve and the second sleeve.

7. The injection device of a die casting machine according to claim 6, wherein Step difference surfaces are formed on the outer peripheral surfaces of the first sleeve and the second sleeve in the direction of the outflow end of the first flow path, The holding portion of the gooseneck portion has a surface that faces and is in contact with the step difference surface.

8. The injection device of a die casting machine according to claim 6, wherein Surfaces that face and are in contact with each other in opposite directions in the direction of the outflow end of the first flow path are formed at the connection position of the first sleeve and the second sleeve.

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