JP3683459B2 - Hot chamber die casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die casting apparatus that performs casting by injecting molten metal (molten metal) into a mold at high pressure, and in particular, a hot chamber type in which an injection part for injecting molten metal is disposed in a heat-retaining furnace for molten metal. The present invention relates to a die casting apparatus.
[0002]
[Prior art]
A hot chamber type die casting apparatus is a casting machine that injects molten metal (molten metal) such as an aluminum alloy into a mold at a high pressure, and in particular, an injection part for injecting molten metal is disposed inside a heat insulation furnace that keeps the molten metal warm. It is a die casting device. FIG. 5 shows a main part of a conventional hot chamber die casting apparatus. As shown in the figure, this hot chamber die casting apparatus is provided with a melting and holding furnace 102 on a gantry 100, and in the melting and holding furnace 102, a ceramic injection functioning as a pressurizing chamber. The main cylinder 104 is supported upright on the bottom surface portion 102 </ b> A of the heat retention furnace 102. A nozzle 106 is connected to the injection main cylinder 104, and the nozzle 106 passes through the side wall 102 </ b> B of the heat retention furnace 102, and its tip communicates with a mold (not shown).
[0003]
Inside the injection main cylinder 104, a plunger (not shown) is moved up and down while sliding. Further, a gooseneck 104A is formed at the bottom of the injection main cylinder 104 so as to rise obliquely upward, and the molten metal in the injection main cylinder 104 is pressed into the mold from the gooseneck 104A and the nozzle 106 to perform casting. ing.
[0004]
[Problems to be solved by the invention]
However, in the case of the conventional die casting apparatus, there is a large difference in thermal expansion coefficient between both the melting and holding furnace 102 made of special steel and the injection main cylinder 104 made of ceramic. For this reason, when the melting and holding furnace 102 is thermally expanded by being heated or contracted by being cooled, the expansion and contraction amounts of both are greatly different, and as a result, thermal stress is generated between the two. There is a problem that the mounting accuracy is deteriorated.
[0005]
Further, in the case of the conventional structure, since the nozzle 106 penetrates the side wall 102B of the melting and holding furnace 102, a through hole for passing the nozzle 106 through the side wall 102B has to be formed. In order to prevent the leakage of the molten metal from the hole, it is necessary to provide a seal for preventing the leakage of the molten metal, which causes a problem that the structure is complicated. Further, the connecting portion between the gooseneck 104A and the nozzle 106 needs to be frequently maintained, and if this connecting portion is positioned below the upper surface level of the molten metal, the workability at the time of performing maintenance deteriorates. Let
[0006]
The present invention has been proposed in order to cope with such various circumstances, and it is possible to ensure the mounting accuracy of the injection part and to simplify the structure of the melting and holding furnace, It is another object of the present invention to provide a hot chamber type die casting apparatus that is excellent in workability during maintenance.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an injection section having a main body of a melting and holding furnace for melting and holding a metal ingot and having an injection main cylinder for pumping the molten metal into a mold in the melting and holding furnace. And an injection driving unit having a plunger that pressurizes the molten metal by moving up and down in the injection main cylinder and an injection cylinder that drives the plunger, and the molten metal passes through the injection main cylinder. In the hot chamber type die casting apparatus that forms a gooseneck and connects the gooseneck to a nozzle that guides molten metal to a mold, a nozzle base is interposed between the gooseneck and the nozzle, and An injection main cylinder is disposed in the main body via a goose holder, and a connection portion between the goose neck and the nozzle base is provided in the melting and holding furnace. It is positioned above the upper surface level of the molten metal, and each connection end surface connecting the nozzle base and the nozzles is formed with a predetermined curvature so that the connection angle of the nozzle to the mold can be changed. It is characterized by that.
[0008]
In the hot chamber die casting apparatus described above, at least one of a carbon packing and a metal O-ring is interposed in a connecting portion between the gooseneck and the nozzle base. And
[0009]
Further, the present invention provides the above-mentioned hot chamber type die casting apparatus, wherein a ring-shaped ridge or recess is formed on a connection end surface of the gooseneck with the nozzle base, and the nozzle base is connected to the gooseneck. The end surface is formed with a fitting portion into which the protruding portion or the recessed portion is fitted.
[0010]
Further, the present invention is characterized in that, in the above-mentioned hot chamber die casting apparatus, the injection driving unit is installed on a frame of the main body in which the injection unit is disposed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of a hot chamber type die casting apparatus according to the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is a side sectional view of a hot chamber type die casting apparatus according to an embodiment, and FIG. 2 is a front view thereof. The hot chamber die casting apparatus 10 according to the present embodiment includes a melting and holding furnace 11, a main body 12, an injection unit 14, an injection driving unit 16, a frame 18 and the like.
[0014]
As shown in FIGS. 1 and 2, the main body 12 of the die casting apparatus 10 is formed in a substantially rectangular parallelepiped shape, and the melting and holding furnace 11 is installed in the main body 12. Specifically, in the melting and holding furnace 11, a peripheral edge portion 11 </ b> A formed in a bowl shape around the periphery and extending in the horizontal direction is supported by an edge portion of the mounting hole 20 formed in the main body 12. Inside the main body 12 of the die casting apparatus 10, a heating device such as a heating burner (not shown) that heats the melting and holding furnace 11 or an electric heater is installed so that the melting and holding furnace 11 can be heated from the inside of the main body 12. Thus, it is possible to heat and keep the molten metal melted in the heat-retaining furnace 11.
[0015]
Next, the configuration of the injection unit 14 and the injection drive unit 16 will be described. FIG. 3 is a detailed view of the injection unit 14. As shown in the figure, the injection section 14 is mainly composed of an injection main cylinder 22. The injection main cylinder 22 is formed of ceramic as a material so as not to be eroded by a molten metal such as an aluminum alloy, and a sleeve 23 is formed in the vertical direction at a substantially central portion thereof. The molten metal in the melting and warming furnace 11 flows into the sleeve 23 from the upper supply path 22B, and a plunger 24 described later is loosely fitted to hold the predetermined sealing property against the sleeve 23 while the plunger 24 moves up and down. It comes to slide on.
[0016]
The injection main cylinder 22 is inserted and installed in the melting and warming furnace 11, and its peripheral portion 22 </ b> A is supported by the main body 12 via the goose holder 26. The goose holder 26 has a continuous shape such as a circular shape in plan view so that the peripheral edge portion 22A can be supported. Between the peripheral portion 22A and the goose holder 26, for example, a buffer material 27 made of a copper plate is interposed over the entire circumference. Therefore, the injection main cylinder 22 does not have a portion in direct contact with the melting and warming furnace 11 inside and outside, and is kept in a thermally separated state. The goose holder 26 is fixed to the frame 18 that constitutes the main body 12.
[0017]
The sleeve 23 is a relief portion 23a formed so that the inner diameter of the lower bottom portion 23A is large over the height L. Further, a gooseneck 23B shaped like a bow neck is formed obliquely upward on the side wall of the lower bottom part 23A, and the molten metal is guided from the gooseneck 23B to the nozzle base 28 leading to the mold. Yes. Since the escape portion 23a having the height L from the lower bottom portion 23A is formed in the vicinity of the entrance rising to the gooseneck 23B, the volume of the bottom portion of the sleeve 23 is increased.
[0018]
As a result of forming the escape portion 23a , the slope of the rising angle of the gooseneck 23B can be made relatively gentle at the portion where the gooseneck 23B and the sleeve 23 are connected, and the gooseneck 23B can be easily processed using a drill. . A goose heater 30 as a heating means is provided at a connection portion between the gooseneck 23B and the nozzle base 28, and the molten metal led from the gooseneck 23B to the nozzle base 28 by heat conducted from the goose heater 30. It is designed to prevent a decrease in temperature.
[0019]
As shown in FIG. 3, the connecting portion between the gooseneck 23 </ b> B and the nozzle base 28 is located above the XX line, which is the upper surface level of the molten metal in the melting and holding furnace 11. For this reason, in this embodiment, unlike the conventional case, there is no need to make a through-hole through which the gooseneck 23B is inserted in the side wall of the melting and holding furnace 11, and the side wall of the melting and holding furnace 11 needs to be sealed to prevent hot water leakage The structure is simplified. Moreover, since the connection part of the gooseneck 23B and the nozzle base 28 is located above, the workability | operativity at the time of maintaining the said part improves.
[0020]
FIG. 4 is an enlarged cross-sectional view showing details of a connecting portion between the gooseneck 23 </ b> B and the nozzle base 28. As shown in the figure, the connection end surface 23C of the gooseneck 23B is connected to the connection end surface 28A of the nozzle base 28 communicating with the nozzle 34. A ring-shaped protrusion 23D is formed on the connection end surface 23C of the gooseneck 23B. On the other hand, on the connection end surface 28A of the nozzle base 28, a groove portion 28C into which the protruding portion 23D is fitted is formed as a fitting portion. The groove 28C is formed to have a width L2 that is slightly larger than the width L1 of the convex portion 23D so that the convex portion 23D is fitted therein.
[0021]
A double sealing structure in which a carbon packing 29 and a metal O-ring 31 are interposed between the groove portion 28C and the convex portion 23D. That is, the packing 29 is fitted in a ring-shaped packing mounting groove 28D cut on the surface of the groove 28C, and the O-ring 31 is cut on the outer surface of the packing mounting groove 28D. It is attached to the ring attachment groove 28E, thereby preventing the molten metal from leaking from the connecting portion between the gooseneck 23B and the nozzle base 28.
[0022]
The connection end surface 28B on the nozzle 34 side in the nozzle base 28 is processed into a spherical shape having a predetermined curvature. On the other hand, the connection end surface 34A of the nozzle 34 is processed into a curved shape that receives the connection end surface 28B. Therefore, if the nozzle 34 is fixed at a position where the angle of the connection end surface 34A with respect to the connection end surface 28B becomes a desired value, The connection angle between the runner 28F of the nozzle base 28 and the runner 34B of the nozzle 34 can be changed. The nozzle 34 is pressed toward the nozzle base 28 with a predetermined pressing force by the nozzle support portion 35, and connects the runner 28F of the nozzle base 28 and the runner 34B of the nozzle 34 in a sealed state by a spherical surface.
[0023]
Thereby, the angle with respect to the metal mold | die of the nozzle 34 can be finely adjusted, and the leak of the molten metal which arises because the attachment angle with respect to the metal mold | die of the nozzle 34 shifts | deviates by the mold clamping force of a metal mold | die can be prevented. Further, by interposing the nozzle base 28 in which the connection end surface 28B with the nozzle 34 is formed into a spherical surface between the nozzle 34 and the gooseneck 23B, it is possible to avoid stress concentration on the ceramic gooseneck 23B. The durability of the injection main cylinder 22 is improved. Furthermore, since it is not necessary to process the ceramic gooseneck 23B into a spherical shape, the processing cost can be reduced.
[0024]
As shown in FIG. 3, the nozzle 34 is supported by a fixed plate 32 via a nozzle heater 37, and this nozzle heater 37 is similar to the goose heater 30 in that the temperature of the molten metal injected from the nozzle base 28 is lowered. To prevent.
[0025]
The configuration of the injection driving unit 16 is as follows. As shown in FIG. 1, the injection drive unit 16 includes the plunger 24, a coupling 36, a cylinder 38, and the like. A cylinder 38 connected to the plunger 24 via a coupling 36 is suspended and supported by a yoke 40 formed on the frame 18 that extends to the upper part of the main body 12 and has a substantially triangular shape. Further, as described above, the injection main cylinder 22 is supported on the frame 18 of the main body 12 by the goose holder 26. That is, the injection unit 14 and the injection drive unit 16 are installed on the same frame 18 constituting the main body 12, and as a result, the dimensional accuracy between the two is improved and the alignment is unnecessary. In addition, there is an advantage that the maintenance inspection becomes easy.
[0026]
The operation of the die casting apparatus 10 of the present embodiment configured as described above is as follows. First, as shown in FIG. 1, molten metal (molten metal) such as an aluminum alloy or a magnesium alloy is stored in the melting and holding furnace 11, and the molten state and constant temperature are set by a heating burner installed inside the main body 12. Is held in. As shown in FIG. 3, the molten metal in the melting and warming furnace 11 is filled to the level of the XX line, and is supplied into the sleeve 23 from the supply path 22 </ b> B of the injection main cylinder 22. Then, when the plunger 24 driven by the cylinder 38 slides up and down in the sleeve 23, the molten metal is pressurized and fed from the gooseneck 23B to the nozzle base 28 and the nozzle 34, and finally a mold (not shown). Casting is carried out.
[0027]
【The invention's effect】
According to the first aspect of the present invention, since the connecting portion between the gooseneck and the nozzle base is positioned above the upper surface level of the molten metal in the melting and holding furnace, the through hole for the gooseneck is provided in the melting and holding furnace. This eliminates the need for drilling, eliminates the need for a hot water leak seal, and simplifies the structure. Furthermore, since the connection end surface, which is a connection portion between the nozzle base and the nozzle, is formed with a predetermined curvature, the angle of the nozzle with respect to the mold can be finely adjusted, and the leakage of the molten metal caused by the deviation of the nozzle mounting angle can be prevented. Can be prevented.
[0028]
According to the second aspect of the present invention, since at least one of the carbon packing and the metal O-ring is interposed in the connecting portion between the gooseneck and the nozzle base, the connecting portion between the gooseneck and the nozzle base. It is possible to prevent the molten metal from leaking out.
[0029]
According to the invention described in claim 3, the ring-shaped protruding line part or the recessed line part is formed on the connecting end surface of the gooseneck connected to the nozzle base, and the protruding line part or the recessed line part is fitted. Since the joint portion is formed on the nozzle base, the sealing performance of the connecting portion between the gooseneck and the nozzle base is improved.
[0030]
According to the fourth aspect of the invention, since the injection driving unit is installed on the frame of the apparatus main body in which the injection unit is disposed, the dimensional accuracy of the injection driving unit and the injection unit is improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a hot chamber type die casting apparatus according to an embodiment.
FIG. 2 is a front view of a hot chamber die casting apparatus according to one embodiment.
3 is an enlarged view of a main part showing a main part of the hot chamber die casting apparatus shown in FIGS. 1 and 2. FIG.
FIG. 4 is an enlarged cross-sectional view showing details of a connecting portion between a gooseneck and a nozzle base.
FIG. 5 is a side sectional view showing a main part of a conventional hot chamber die casting apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Hot chamber type die-casting apparatus 11 Melting and heating furnace 11A Peripheral part 14 Injection part 16 Injection drive part 18 Frame 20 Mounting hole 22 Injection main cylinder 22A Peripheral part 22B Supply path 23 Sleeve 23A Bottom part 23B Gooseneck 23C Connection end surface 23D Convex part 24 Plunger 26 Goose holder 28 Nozzle base 28A Connection end face 28B Connection end face 28C Groove (fitting part)
28D Packing mounting groove 28E O-ring mounting groove 28F Runway 29 Packing 30 Goose heater (heating means)
31 O-ring 32 Fixing plate 34 Nozzle 34A Connection end face 34B Runway 35 Nozzle support portion 36 Coupling 37 Nozzle heater 38 Cylinder 40 Yoke

Claims (4)

A melting and holding furnace that melts and retains the metal ingot is supported by the main body, and an injection portion having an injection main cylinder that pumps the molten metal to the mold is installed in the melting and holding furnace, and the inside of the injection main cylinder is moved up and down. An injection driving unit having a plunger that pressurizes the molten metal by moving and an injection cylinder that drives the plunger is provided, and a gooseneck through which the molten metal passes is formed in the injection main cylinder. In a hot chamber type die casting apparatus connected to a nozzle for guiding molten metal to
With nozzle base is interposed between the nozzle and the gooseneck, the injection main tube is disposed in the body through Gusuhoruda, the melting heat retaining furnace coupling portion between the gooseneck and the nozzle base So that it is located above the upper surface level of the molten metal inside ,
A hot chamber type die casting apparatus , wherein each nozzle base and each connection end face connecting the nozzles are formed with a predetermined curvature so that a connection angle of the nozzle to a mold can be changed . 2. The hot chamber die casting apparatus according to claim 1 , wherein at least one of a packing made of carbon and a metal O-ring is interposed in a connecting portion between the gooseneck and the nozzle base.   The gooseneck is formed with a ring-shaped convex or concave portion on the end surface of the nozzle base connected to the nozzle base, and the convex base or concave portion is fitted to the end surface of the nozzle base connected to the gooseneck. The hot chamber die casting apparatus according to claim 1 or 2, wherein a joining portion is formed. The hot chamber die casting apparatus according to any one of claims 1 to 3, wherein the injection driving unit is installed on a frame of the main body in which the injection unit is disposed.

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