Injection device of die cast machine

Abstract

To achieve improvement of durability and curb component costs and operating costs.SOLUTION: An injection device D of a die cast machine of the disclosure includes: a goose neck 20 to be immersed in a molten metal M; and substantially cylindrical sleeves 30, 40 which are disposed in the goose neck and provided with an inlet through which the molten metal flows and form a first passage F1 into which a plunger for compressing the molten metal is inserted with inner wall surfaces. In the goose neck 20, a second passage F2 passing from an outflow end side of the first passage F1 to an injection port side in which the molten metal is injected to a die, and a holding part 22 which encloses outer peripheral surfaces of the sleeves 30, 40 and contacts with the outer peripheral surfaces to hold the sleeves are formed. The sleeves 30, 40 are made of ceramics, and the goose neck 20 is made of a metal having aluminum erosion resistance.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an injection device of a die-casting machine.

Background Art

[0002] There is a die-casting machine as a device for molding alloys such as aluminum, magnesium, and zinc. And, among die-casting machines, there is a hot-chamber type in which an injection device for injecting molten metal into a mold is immersed in the molten metal.

[0003] Here, FIG. 1 shows an injection device 100 in a hot-chamber type die-casting machine disclosed in Patent Document 1. The injection device 100 in Patent Document 1 includes a gooseneck 1 immersed in a molten aluminum alloy, and a flow path for the molten metal to be injected into the mold is formed in the gooseneck 1. Specifically, the gooseneck 1 has a wide first flow path (a flow path extending in the vertical direction on the right side of FIG. 1) on the inflow hole 5 side where the molten metal flows in, and a narrow second flow path (a flow path extending in the vertical direction on the left side of FIG. 1) formed at an outflow hole 7 communicating with a nozzle mounting port 8 where the molten metal flows out.

[0004] And, in the injection device 100 of Patent Document 1, a substantially cylindrical sleeve 11 that forms the flow path itself on the inner wall surface and guides the plunger is provided in the first flow path on the inflow side of the gooseneck 1, and further, on the outer peripheral side of the sleeve 11, a substantially cylindrical holder 13 arranged to surround the outside of the sleeve 11 is provided. The holder 13 is connected at the lower end of the sleeve 11, and the first flow path is formed by the wall surfaces of the sleeve 11 and the holder 13. At this time, the sleeve 11 is made of ceramic, and the holder 13 is made of a metal having aluminum melt erosion resistance.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] However, in the technique described in the above-mentioned Patent Document 1, since the sleeve 11 and the holder 13 are connected in the first flow path, the holder 13 may be melted by the molten metal flowing through the first flow path at such a connection portion. For this reason, the durability of the injection device is reduced, and problems such as component costs and work costs are incurred, such as the need to frequently replace parts.

[0007] Therefore, an object of the present disclosure is to provide an injection device for a die-casting machine that can improve durability and suppress component costs and work costs.

MEANS FOR SOLVING THE PROBLEMS

[0008] An injection device for a die-casting machine according to an aspect of the present disclosure includes: a gooseneck immersed in molten metal; a substantially cylindrical sleeve disposed inside the gooseneck and forming an inner wall surface of a first flow path in which an inlet through which molten metal flows is formed and a plunger for pressurizing the molten metal is inserted; and inside the gooseneck, a second flow path communicating from the outflow end side of the first flow path toward the injection port side where the molten metal is injected into the mold, and a holding portion that surrounds the outer peripheral surface of the sleeve and contacts the outer peripheral surface to hold the sleeve are formed. The sleeve is made of ceramic, and the gooseneck is made of a metal having aluminum melt erosion resistance. It has such a configuration.

EFFECTS OF THE INVENTION

[0009] With the present disclosure configured as described above, it is possible to improve durability and suppress component costs and work costs.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0011] <The First Embodiment> The first embodiment of this disclosure will be described with reference to the drawings. Note that the drawings may be relevant to any of the embodiments.

[0012] [Configuration] The injection device of the die - casting machine in this embodiment is of the hot - chamber type. FIG. 2 shows a cross - sectional view of a part of the configuration of the injection device D of the die - casting machine. As shown in FIG. 2, the injection device D is arranged in a state where a part is immersed in the molten aluminum alloy M stored in the pot P. Note that the injection device of the die - casting machine in this embodiment is applicable to the molten metal of any alloy.

[0013] The injection device D includes a gooseneck 20 immersed in the molten metal M. The gooseneck 20 is made of a metal having aluminum melt erosion resistance. Here, an enlarged view of the gooseneck 20 is shown in FIG. 3. As shown in FIGS. 2 and 3, inside the gooseneck 20, mainly, a receiving portion 21 (a hollow portion located on the right side in FIG. 3) where sleeve units 30 and 40 are arranged as described later to form a first flow path F1, a second flow path F2 (a hollow portion located on the left side in FIG. 3) which is a hollow portion located in parallel with the receiving portion 21, and a third flow path F3 (a hollow portion located on the lower side in FIG. 3) which is a hollow portion communicating with the receiving portion 21 and the second flow path F2, are formed.

[0014] The receiving portion 21 of the gooseneck 20 is formed in a substantially cylindrical hollow region having a predetermined length. One end side located above in FIG. 2 is open to the outside, and the other end side located below in FIG. 2 communicates with the third flow path F3. And, in the receiving portion 21, a holding portion 22 having an inner diameter smaller than that of other portions above is formed at a predetermined position in the length direction to a position near the other end. Also, an inflow hole 21a penetrating the side wall is formed in the side wall on the one end side of the receiving portion 21 from the position where the holding portion 22 of the receiving portion 21 is formed. For this reason, the molten metal M flows into the receiving portion 21 of the gooseneck 20 from the inflow hole 21a.

[0015] 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 by connecting a main sleeve 30 (first sleeve) arranged above which is one end side of the receiving portion 21 and a sleeve collar 40 (second sleeve) arranged below which is the other end side of the receiving portion 21. The main sleeve 30 and the sleeve collar 40 are made of ceramic. Note that the sleeve units 30 and 40 are pressed from above toward the holding portion 22 side by a sleeve retainer 60 and a retainer cover 70.

[0016] The main sleeve 30 is formed in a substantially cylindrical shape having a predetermined length, and its outer peripheral surface is in contact with and held by the holding portion 22. The inner diameter of the main sleeve 30 is formed to have a substantially constant diameter along the longitudinal direction. Further, an inlet 31 that penetrates 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 gooseneck 20 described above. Thereby, 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 from the inlet 31 of the main sleeve 30. Thus, inside the main sleeve 30, as shown by the arrow Y1 in FIGS. 2 and 3, a first flow path F1 is formed through which the molten metal M flows from the upper side, which is one end side, toward the lower side, which is the other end side, along the length direction. A plunger 50 for pressurizing the molten metal M is inserted into the main sleeve 30 from one end side.

[0017] The sleeve collar 40 is in contact with and connected to the other end of the main sleeve 30. The sleeve collar 40 is formed in a substantially cylindrical shape having a predetermined length shorter than that of the main sleeve 30, and its outer peripheral surface is in contact with and held by the holding portion 22. Specifically, the outer diameter of the sleeve collar 40 is formed to be different between one end side portion (the upper side portion in FIG. 3) and the other end side portion (the lower side portion in FIG. 3) in the longitudinal direction. The outer diameter of the one end side portion of the sleeve collar 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. Further, the inner diameter of the one end side portion of the sleeve collar 40 is formed to be smaller on the other end side than near the connection portion with the main sleeve 30. Specifically, as shown in FIG. 3, the inner diameter 41 of the one end side portion of the sleeve collar 40 is formed in a tapered shape so as to gradually decrease from the connection portion 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 collar 40 is formed to have a substantially constant diameter.

[0018] The interior of the sleeve collar 40 is formed with an inner diameter as described above and communicates with the interior of the main sleeve 30. That is, the interior of the main sleeve 30 and the interior of the sleeve collar 40 form a series of first flow paths F1 through which the molten metal M flows. For this reason, the vicinity of the other end of the sleeve collar 40 serves as the outflow end F1e of the first flow path F1.

[0019] Here, Fig. 4 shows an enlarged view of the connection portion between the main sleeve 30 and the sleeve collar 40, and the configuration of such a connection portion will be described. As indicated by reference numeral R1 in Fig. 4, in the vicinity of the connection portion, the side walls of the main sleeve 30 and the sleeve collar 40 overlap each other along the longitudinal direction, and are in contact with each other and connected. Specifically, by inserting the sleeve collar 40 into the main sleeve 30, the inner wall surface of the main sleeve 30 and the outer wall surface of the sleeve collar 40 are in contact with each other and connected. At this time, the outer diameter of the sleeve collar 40 in the vicinity of the connection portion is formed smaller than the inner diameter of the main sleeve 30, and the portion where the outer diameter of the sleeve collar 40 is formed smaller is inserted into the main sleeve 30 and then connected.

[0020] Also, according to the above configuration, as indicated by reference numeral R2 in Fig. 4, a stepped surface is formed at the location where the outer diameter of the sleeve collar 40 inserted into the main sleeve 30 is formed smaller, and the other end surface of the main sleeve 30 abuts against such a stepped surface. That is, the surface formed at the other end of the main sleeve 30 facing the direction of the outflow end F1e of the first flow path F1 and the stepped surface of the sleeve collar 40 facing the opposite direction face each other and abut.

[0021] Also, at the connection location, the side wall of the end portion of the main sleeve 30 into which the sleeve collar 40 is inserted is formed with a smaller outer diameter and a thinner thickness. As a result, as shown by reference numeral 32 in FIG. 4, a stepped surface facing the outflow end F1e direction of the first flow path F1 is formed on the outer peripheral surface of the end portion of the main sleeve 30. Further, as shown by reference numeral 42 in FIG. 4, a stepped surface facing the outflow end F1e direction of the first flow path F1 is also formed on the outer peripheral surface between the one end side portion and the other end side portion of the above-described sleeve collar 40.

[0022] And the holding portion 22 of the gooseneck 20 that holds the main sleeve 30 and the sleeve collar 40 is configured to have an inner surface that abuts against the outer peripheral surface corresponding to the outer peripheral surface shapes of the above-described main sleeve 30 and sleeve collar 40. For example, the holding portion 22 is formed to have abutting surfaces that respectively face and abut against the stepped surfaces 32, 42 formed on the outer peripheral surfaces of the main sleeve 30 and the sleeve collar 40. Further, the holding portion 22 abuts against and holds all locations of the outer peripheral surfaces of the main sleeve 30 and the sleeve collar 40 without gaps.

[0023] Further, inside the gooseneck 20, as shown in FIG. 3, a third flow path F3 and a second flow path F2 that communicate with a first flow path F1 formed by sleeve units 30 and 40 disposed in the accommodating portion 21 as described above are formed so as to extend from the first flow path F1. Specifically, the third flow path F3 is formed to bend and extend substantially at a right angle with respect to the longitudinal direction of the first flow path F1 from the outflow end F1e 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. Then, the second flow path F2 is further formed to bend and extend substantially at a right angle from the end of the third flow path F3, and is formed to have substantially the same inner diameter as the third flow path F3. For this reason, as shown in FIG. 3, the second flow path F2 is positioned in parallel with the first flow path F1. That is, the longitudinal direction of the second flow path F2 is substantially parallel to the longitudinal direction of the first flow path F1, and as shown by the arrow Y2 in FIG. 3, the direction of flow of the molten metal M flowing inside the second flow path F2 is opposite to the direction of flow Y1 inside the first flow path F1. Further, the end F2e side, which is the outflow destination of the second flow path F2, is further bent and extended toward the injection port where the molten metal M is injected into the mold. In addition, it is desirable that the inner wall surfaces of the third flow path F3 and the second flow path F2 described above are formed as curved surfaces at the locations where the flow paths bend. Thereby, the flow of the molten metal M in the flow path becomes smooth.

[0024] As described above, the injection device D of the die-casting machine in the present embodiment is a portion where the molten metal M flows into and is pressurized inside the gooseneck 20, and a portion where the amount of the molten metal M is large and the flow is intense is configured by ceramic sleeve units 30 and 40. For this reason, it is possible to suppress the erosion of the molten metal M in such a portion, and it is possible to improve the durability of the injection device D. Further, thereby, it is not necessary to frequently replace parts, and it is possible to reduce the parts cost and the working cost.

[0025] Further, by configuring the sleeve units 30 and 40 with the main sleeve 30 and the sleeve collar 40, it becomes easy to form the shape of the sleeve that can allow a desired amount of the molten metal M to flow through. In particular, by making the sleeve collar 40, which restricts the amount of the molten metal M, made of ceramic, it is possible to improve the durability of the portion that is easily eroded.

[0026] Also, at the connection portion between the main sleeve 30 and the sleeve collar 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 portion 22 of the gooseneck 20 by such a stepped surface. Thereby, it is possible to effectively suppress the leakage of the molten metal M at the connection portion between the main sleeve 30 and the sleeve collar 40, and it is possible to suppress the melting damage of the gooseneck 20.

[0027] As described above, the present disclosure has been described with reference to the above embodiments and the like. However, the present disclosure is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. And each of the above-described embodiments can be combined with other embodiments as appropriate.

[0028] <Supplementary Note> Some or all of the above embodiments can also be described as follows. Hereinafter, the outline of the configuration of the injection device of the die-casting machine in the present disclosure will be described. However, the present disclosure is not limited to the following configuration. (Supplementary Note 1) A gooseneck immersed in the molten metal, A substantially cylindrical sleeve disposed inside the gooseneck, having an inlet through which the molten metal flows in and forming a first flow path into which a plunger for pressurizing the molten metal is inserted on the inner wall surface, Comprising, Inside the gooseneck, a second flow path communicating from the outflow end side of the first flow path toward the injection port side where the molten metal is injected into the mold, and a holding portion surrounding the outer peripheral surface of the sleeve and abutting against the outer peripheral surface to hold the sleeve are formed. The sleeve is made of ceramic, and the gooseneck is made of a metal having aluminum melting damage resistance. An injection device of a die-casting machine. (Supplementary Note 2) The injection device of the die-casting machine according to Supplementary Note 1, The sleeve is composed of a substantially cylindrical first sleeve in which the inlet is formed and the inner diameter is 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. Injection device of a die-casting machine. (Supplementary Note 3) An injection device of a die-casting machine according to Supplementary Note 2, 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 portion with the first sleeve. Injection device of a die-casting machine. (Supplementary Note 4) An injection device of a die-casting machine according to Supplementary Note 2, the second sleeve is formed such that at least a part of the inner diameter gradually decreases from the connection portion with the first sleeve toward the outflow end of the first flow path. Injection device of a die-casting machine. (Supplementary Note 5) An injection device of a die-casting machine according to Supplementary Note 2, the side wall of the first sleeve and the side wall of the second sleeve are in contact with each other and connected such that the wall surfaces overlap at the connection portion. Injection device of a die-casting machine. (Supplementary Note 6) An injection device of a die-casting machine according to Supplementary Note 2, the first sleeve and the second sleeve are in contact with each other at the connection portion, the holding portion of the gooseneck is in contact with the outer peripheral surfaces of the first sleeve and the second sleeve to hold the first sleeve and the second sleeve. Injection device of a die-casting machine. (Supplementary Note 7) An injection device of a die-casting machine according to Supplementary Note 6, step surfaces facing the outflow end direction of the first flow path are formed on the outer peripheral surfaces of the first sleeve and the second sleeve respectively, the holding portion of the gooseneck has a surface that abuts against the step surface. Injection device of a die-casting machine. (Appendix 8) An injection device of a die-casting machine according to Appendix 6, at the connection portion between the first sleeve and the second sleeve, surfaces are formed which face each other and abut against each other in the outflow end direction of the first flow path and the opposite direction respectively. Injection device of a die-casting machine.

Explanation of reference numerals

[0029] D Injection device P Pot M Molten metal 20 Gooseneck 21 Accommodating portion 21a Inflow hole 22 Holding portion 30 Main sleeve 31 Inlet 32 Step surface 40 Sleeve collar 42 Step surface 50 Plunger 60 Sleeve retainer 70 Retainer cover F1 First flow path F2 Second flow path F3 Third flow path

Claims

1. A gooseneck immersed in molten metal, A substantially cylindrical sleeve disposed inside the gooseneck, having an inlet through which molten metal flows and forming a first flow path on the inner wall surface into which a plunger for pressurizing the molten metal is inserted, Comprising, Inside the gooseneck, a second flow path communicating from the outflow end side of the first flow path toward the injection port side where the molten metal is injected into the mold, and a holding portion surrounding the outer peripheral surface of the sleeve and contacting the outer peripheral surface to hold the sleeve are formed, The sleeve is made of ceramic, and the gooseneck is made of metal having aluminum melt erosion resistance, An injection device of a die-casting machine.

2. The injection device of a die-casting machine according to Claim 1, The sleeve is composed of a substantially cylindrical first sleeve in which the inlet is formed and the inner diameter is 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, An injection device of a die-casting machine.

3. The injection device of a die-casting machine according to Claim 2, The second sleeve has a smaller inner diameter near the outflow end of the first flow path than near the connection portion with the first sleeve, An injection device of a die-casting machine.

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

5. The injection device of a die-casting machine according to Claim 2, The side wall of the first sleeve and the side wall of the second sleeve are in contact with each other and connected at the connection portion so that the wall surfaces overlap each other, An injection device of a die-casting machine.

6. The injection device of a die-casting machine according to Claim 2, The first sleeve and the second sleeve are in contact with each other at the connection portion, The holding portion of the gooseneck contacts the outer peripheral surfaces of the first sleeve and the second sleeve to hold the first sleeve and the second sleeve, An injection device of a die-casting machine.

7. The injection device of a die-casting machine according to Claim 6, Step surfaces facing the outflow end direction of the first flow path are formed on the outer peripheral surfaces of the first sleeve and the second sleeve respectively, The holding portion of the gooseneck has a surface that abuts against the stepped surface and faces it. An injection device for a die-casting machine.

8. An injection device for a die-casting machine according to claim 6, At the connection point between the first sleeve and the second sleeve, surfaces are formed that face each other and abut against each other, facing the outflow end direction of the first flow path and the opposite direction, respectively. An injection device for a die-casting machine.

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