JP3002338B2 - Die casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting machine, and more particularly to a die casting machine having a molten metal supply unit having a holding furnace or a melting furnace and an injection unit having a mechanism for injecting a molten metal into a mold. It is about machines.

[0002]

2. Description of the Related Art A molten metal supply unit having a melting furnace for melting metal or a holding furnace for holding molten metal, and an injection unit having a mechanism for injecting the molten metal into a mold are provided. A die casting machine configured to supply a molten metal from a molten metal supply unit to an injection unit is disclosed in, for example, Japanese Patent Application No. 3-3037 by the present applicant.
No. 58, Japanese Patent Application No. 3-303760, Japanese Patent Application No. 3-303
No. 767.

[0003] In a die casting machine having such a molten metal supply unit and an injection unit, in order to reliably maintain a connection state between an outlet runner tube of the molten metal supply unit and an inlet runner tube of the injection unit. The melt supply unit and the injection unit are mechanically connected by a plurality of joints, so that both units are integrated. And
In order to press the tip of the nozzle part projecting upward from the injection unit into the injection port of the mold (fixed mold) so as not to leak the molten metal, the entire composite in which the above-described molten metal supply unit and the injection unit are integrated is integrated. Then, the nozzle was lifted horizontally by a lifting mechanism using a hydraulic cylinder, and the tip of the nozzle was pressed against the injection port of the fixed mold.

[0004]

However, as described above, if a configuration is adopted in which the entire composite in which the molten metal supply unit and the injection unit are integrated is lifted up horizontally, the lifting mechanism becomes large and complicated, and a large Since a driving source is required, and it is difficult to lift the entire composite horizontally in a well-balanced manner, there has been a problem that the pressure applied to the tip of the nozzle tends to vary.

[0005] In order to press the tip of the nozzle portion into the injection port of the fixed mold, a method of lifting only the nozzle portion from the injection unit or a method of pushing the fixed mold side down with respect to the nozzle portion are also considered. However, in the former method of moving only the nozzle portion up and down, it is difficult to complete the sealing structure between the sliding nozzle portion and the runner tube member connected to the nozzle portion. In the latter technique of moving the fixed mold side up and down, the fixed die plate holding the fixed mold serving as the reference position member in the mold mechanism must be moved. There is a concern that the operation accuracy of the mechanism may be affected, and there is also a problem that the elevating mechanism of the fixed die plate is complicated.

[0006] The present invention has been made in view of the above points,
The purpose is to simplify the mechanism for press-fitting the tip of the nozzle to the injection port of the fixed mold in a die-casting machine having a structure in which the molten metal supply unit and the injection unit are integrated. An object of the present invention is to realize a die casting machine that can easily and reliably determine the accuracy of a crimping force applied to a tip.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a molten metal supply unit provided with a melting furnace for melting metal or a holding furnace for holding molten metal, and a metal melt from the molten metal supply unit. An injection unit having a nozzle portion projecting upwardly for injecting a molten metal into a mold receiving the supply of the molten metal, and a die casting machine comprising a molten metal supply unit and an injection unit integrally connected side by side, At the lower end of the molten metal supply unit side opposite to the injection unit, there is provided a rotating support means of a complex formed by integrating the molten metal supply unit and the injection unit, and a nozzle portion on the lower surface side of the injection unit. Is provided at a position substantially directly below the composite body, for example, a hydraulic cylinder that can lift the composite body. Lifting by tilting the turning support means as a pivot point, and allows pushing the tip of the nozzle portion of the mold inlet, it is achieved by a structure.

[0008]

The composite body in which the molten metal supply unit and the injection unit are integrated by the hydraulic cylinder as the lifting drive means is tilted and lifted up using the rotation support means as a rotation fulcrum. That is, the composite is lifted in a cantilever manner with the rotation support means as a rotation fulcrum, and accordingly, the tip of the nozzle on the upper surface side of the injection unit is pressed against the injection port of the mold with a predetermined pressure. In this case, since the hydraulic cylinder is disposed substantially directly below the nozzle on the lower surface side of the injection unit, the driving force of the hydraulic cylinder is transmitted to the tip of the nozzle without waste. Thus, the setting of the pressing force by the driving force of the hydraulic cylinder is also easy and reliable. Furthermore, since the above-mentioned complex is lifted in a cantilever manner, the driving force (drive source) for lifting up can be reduced as compared with the case where the whole complex is lifted horizontally, and the lift-up mechanism is simple. And contribute to cost reduction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a simplified front view of the die casting machine according to the present embodiment. In the figure, reference numerals 1 and 2 generally denote a molten metal supply unit and an injection unit. The die casting machine according to the present embodiment includes the molten metal supply unit 1, the injection unit 2, and a mold opening / closing unit (not shown). It is mainly composed of a vertically arranged mold mechanism unit whose mechanism moves up and down, and FIG. 1 shows only a fixed mold 3 of the mold mechanism unit.

Although not shown, a holding furnace for holding a molten metal obtained by melting a metal material such as aluminum and zinc is provided in the molten metal supply unit 1, and is provided at a lower side of the holding furnace. The molten metal outflow hole is communicated with the outlet runner tube 4 via a runner tube member as appropriate. In addition, as a furnace provided in the molten metal supply unit 1, instead of a holding furnace, a melting furnace for melting and holding a metal material may be used.

Further, the injection unit 2 is provided with an inlet runner pipe 5 connected to the outlet runner pipe 4, so that the outlet runner pipe 4 and the inlet runner pipe 5 are securely connected to each other without leakage. Are connected and communicated via a simple sealing mechanism. In the injection unit 2, although not shown, a pressurized chamber filled with the molten metal supplied from the molten metal supply unit 1, a lower part of the pressurized chamber and a nozzle portion 6 protruding from the upper surface side of the injection unit 2. A runner pipe structure communicating with the lower part of the nozzle is provided, and the molten metal pressurized by air or the like in the pressurizing chamber can be injected and filled into the mold from the nozzle portion 6 by a predetermined amount per shot. It has become.

In this embodiment, since the internal structures of the molten metal supply unit 1 and the injection unit 2 are not directly related to the gist of the present invention, a description thereof will be omitted. No. 3-303758, Japanese Patent Application No. 3-
No. 303760, Japanese Patent Application No. 3-303767).

In the present embodiment, the molten metal supply unit 1 and the injection unit 2 are connected by four joints 7, so that the molten metal supply unit 1 and the injection unit 2 are firmly integrated side by side. It is configured to be a combined (combined with sufficient mechanical strength) composite A.

A support bracket 8 is fixed to a lower end of the molten metal supply unit 1 opposite to the injection unit 2, and the support bracket 8 is supported by a rotation holding frame 10 mounted on a base 9. It is rotatably held via a shaft 11. That is, the composite A obtained by integrating the molten metal supply unit 1 and the injection unit 2 is as follows.
It is configured to be rotatable with the lower right corner in the drawing as a pivot point.

An elevation drive cylinder 12 (hydraulic cylinder) capable of lifting the complex A is attached to the lower surface of the injection unit 2 at a position substantially below the nozzle section 6. The tip of the piston rod 12a is always carried by the receiving member 13 on the base 9. In this embodiment,
Although not shown, the lifting drive cylinder 12 is provided with a relief valve. By setting the relief pressure of the relief valve to an appropriate pressure force applied to the tip of the nozzle portion 6, the relief valve is moved from the nozzle portion 6 by thermal expansion or the like. When the load (reaction force) increases, the lifting / lowering drive cylinder 12 relieves the pressurized oil corresponding to the excess pressure.

In the above-described configuration, when the lifting drive cylinder 12 is driven to project the piston rod 12a by a predetermined amount, the composite A is cantilevered in the direction of the arrow in FIG. It is tilted up and lifted up. Accordingly, the nozzle portion 6 also rises (for example, rises by about 5 mm), and the tip end surface (spherically-formed contact surface) of the nozzle portion 6 becomes the injection port 3 of the fixed mold 3.
a, and the tip end surface of the nozzle portion 6 is pressed against the fixed mold 3 with a predetermined appropriate press-fitting force. Are connected.

At this time, since the elevation drive cylinder 12 is disposed substantially below the nozzle section 6 on the lower surface side of the injection unit 2, the elevation drive cylinder (hydraulic cylinder) is provided.
The driving force of No. 12 is surely transmitted to the tip of the nozzle portion 6 without waste, and therefore, the setting of the pressing force by the driving force of the hydraulic cylinder becomes easy and reliable. Further, the complex A
Is lifted in a cantilever manner, so that the driving force (drive source) for lifting up can be made smaller than in the case where the entire complex A is lifted horizontally, and the lifting up mechanism can be simplified.

In the above-described embodiment, the nozzle portion 6 is always pressed against the injection port 3a of the solid mold 3 during the casting operation. However, the nozzle portion 6 is pressed every shot cycle during the casting operation. The solid mold 3 may be separated from the injection port 3a. That is, the nozzle may be touched when the molten metal is injected and filled into the mold, the nozzle may be backed during the cooling period of the casting, and the nozzle portion 6 may be separated from the solid mold 3 during the cooling period. In this way, heat is not transmitted from the nozzle portion 6 to the mold during the cooling period, and greatly contributes to non-defective casting, for example, when casting a thin-walled product.

[0019]

As described above, according to the present invention, in the die casting machine having a structure in which the molten metal supply unit and the injection unit are integrated, the mechanism for pressing the tip of the nozzle portion to the injection port of the fixed mold is simple. In addition, there is a remarkable effect that the accuracy of the crimping force applied to the tip of the nozzle portion can be easily and reliably obtained.

[Brief description of the drawings]

FIG. 1 is a simplified front view of a die casting machine according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten supply unit 2 Injection unit A complex 3 Fixed mold 3a Inlet 4 Outlet runner tube 5 Inlet runner tube 6 Nozzle part 7 Joint part 8 Support bracket 9 Base 10 Rotation holding frame 11 Support shaft 12 Elevating drive cylinder (Hydraulic cylinder) 12a Piston rod 13 Receiving member

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-238155 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 17/30 B22D 45/00

Claims (2)

(57) [Claims] 1. A molten metal supply unit having a melting furnace for melting metal or a holding furnace for holding molten metal, and receiving the supply of the molten metal from the molten metal supply unit, injecting the molten metal into a mold. And an injection unit having a nozzle portion protruding upward for performing the above operation, wherein the molten metal supply unit and the injection unit are laterally and integrally connected to each other. At the lower end on the opposite side, there is provided a rotating support means of a composite body in which the molten metal supply unit and the injection unit are integrated, and the composite body is provided substantially directly below the nozzle portion on the lower surface side of the injection unit. Lifting / lowering driving means capable of lifting a body is provided, and the composite is tilted and held by the lifting / lowering driving means with the rotation supporting means as a rotation fulcrum. Below,
A die casting machine, wherein a tip of the nozzle portion can be pressed against an injection port of the mold. 2. The die casting machine according to claim 1, wherein said lifting drive means is a hydraulic cylinder with a relief valve, said hydraulic cylinder relieving hydraulic oil in response to an increase in load.