JPS6167556A - Injection sleeve for die casting - Google Patents

Abstract

PURPOSE:To provide a titled injection sleeve for die casting which improves the cooling effect in the high-temp. part of a sleeve for injection of a molten metal, extends the life thereof and permits the reuse of waste heat by mounting a heat pipe to the outside circumferential surface of the sleeve. CONSTITUTION:The molten metal admitted through a feed port 2 to the injection hole 3 of the injection sleeve 1 is fed to a metallic mold M when pressed P by a plunger. The heat medium of a heat pump is passed from a condensing tank 7 to the heat medium passage 6 on the outside circumferential surface of the sleeve 1 to cool the sleeve 1, by which the life thereof is extended. The heat recovered in the tank 7 of the heat pump is reused by which the effect of energy economization is expected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a die-casting sleeve installed in a die-casting machine.

[Prior Art] Generally, the injection sleeve installed in a die-casting machine that casts gold parts such as cylinder heads and camera bodies for auto-hikes is used to pour the metal to be cast into the injection sleeve, and then it is heated to high pressure by moving the plunger. Since it is used as a conduit for injection into a mold at high speeds, it is exposed to very high temperatures and therefore requires material properties that are heat resistant.

In recent years, surface-treated refractory metals such as molybdenum alloys and tungsten alloys have been used as injection sleeves for high-temperature molten metals exceeding 1000°C, but these abrasives are expensive. In addition, there was a problem that the service life was short due to early deterioration.

[Object of the Invention] Therefore, the present invention solves the above-mentioned conventional problems, and by installing a heat pipe around the injection hole of the die-casting injection sleeve, it increases the cooling effect of the part that becomes the highest temperature, and also improves the cooling effect of the die-casting injection sleeve. The purpose is to extend the service life of the

[Structure of the invention]

That is, the die-casting injection sleeve of the present invention can be used as a sleeve for molten metal injection! It is constructed by installing a heat pipe around the 11 holes as a heat source.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a die-casting injection sleeve installed in a die-casting machine according to an embodiment of the present invention.

First, in FIG. 1, the injection sleeve 1 is attached to the mold with one side indicated by the arrow M on the right side of the figure aligned with the injection hole of the mold, and the other side indicated by the arrow P on the left side of the figure. On the side, a plunger that is reciprocated by an appropriate driving means is tightly inserted into the inner peripheral surface of the injection hole 3, and furthermore, on the plunger side indicated by P, there is an injection port 2 for molten metal. It is provided so as to communicate with the injection hole 3 of the injection sleeve 1 .

Therefore, in this embodiment, the injection sleeve l has a double structure of an outer cylinder 4 and an inner cylinder 5 fitted therein, and a spiral heat is generated between the outer cylinder 4 and the inner cylinder 5. A medium passage 6 is formed, and this heat medium passage 6
As shown in the schematic diagram in FIG. 1, the heat medium passage 6 is used as the evaporation side, and the condensation tank 7 provided above is connected to the condensation tank 7 through a pipe 8. It is a heat pipe composed of a passage 6.1, a compression tank 7) and piping 8.

By attaching a doped pipe to the injection sleeve I using the area around the injection hole 3 as a heat source, the injection sleeve 1 exposed to high temperatures can be effectively cooled.
The heat extracted by this heat pipe can also be used for other purposes.

Next, FIG. 2 shows an injection sleeve 1 in another embodiment of the present invention, which has almost the same structure and function as the case in FIG. 1, and the same parts have the same part numbers. However, the difference is that the structure of the injection sleeve 1 is integrated, a plurality of horizontal holes 10 are drilled around the injection hole 3 of the injection sleeve 1, and a heat pipe is installed in them. By inserting 9, the same function as shown in Fig. 1 can be provided, and the heat of the hottest part of the injection sleeve 1 can be extracted with a heat medium and the cooling effect can be doubled.
Moreover, the entire device can be made compact.

〔Effect of the invention〕

In the die-cast injection sleeve of the present invention having the above configuration, by cooling the area around the injection hole, which is exposed to the highest temperature, with a heat pump, it is effective to extend the service life of the injection sleeve.

Furthermore, since the heat extracted by the heat pump can be used for various purposes, labor-saving effects can also be expected.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a die-casting injection sleeve installed in a die-casting machine according to one embodiment of the present invention, and FIG. 2 is a side cross-sectional view of a die-casting injection sleeve according to another embodiment.

Claims (1)

[Claims] A die-casting injection sleeve characterized in that a heat pipe is attached to the sleeve for molten metal injection, and a heat pipe that uses the area around the injection hole as a heat source is attached.