JPH0217737Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure of an injection chamber particularly suitable as an injection chamber of a hot chamber die-casting machine for high melting temperature metals such as magnesium and aluminum.

[Prior art and its problems]

A sleeve is fitted into the injection chamber of the hot chamber die-casting device. However, at the time of replacement, the sleeve adheres tightly to the gooseneck body, making it extremely difficult to replace.
When the sleeve wore out, the Goosenet's main body also reached the end of its lifespan.

Since this is very uneconomical, a method has been proposed in which a sleeve having several sleeve rings fitted around its outer periphery is inserted into the injection chamber. (Jitko Showa 47-16580
In other words, according to this method, even if the fitting dimensions are loosened, the molten metal pressurized by the plunger will not leak through the space between the sleeve and the gooseneck body, and the sleeve will not last long. This makes it easier to replace the parts when they arrive.

However, when trying to cast aluminum with a melting temperature of 700°C using a hot chamber die-casting machine that uses this method, the sleeve ring becomes annealed and loses its spring force, causing hot water to leak and causing the aluminum to die. It turned out that it cannot be used for casting.

Therefore, the present invention attempts to propose a solution that changes the conventional perception that hot chamber die-casting equipment cannot cast magnesium or aluminum, which have high melting temperatures.

[Means for solving problems]

That is, in order to solve the above-mentioned problems, the present invention provides a hot chamber die-casting machine in which a sleeve having several sleeve rings fitted around the outer periphery is fitted into the injection chamber, in which the sleeve is connected from the inner wall to the sleeve ring groove. It is designed to have holes.

[Effect]

If the sleeve is provided with a hole that communicates from the inner wall to the sleeve ring groove as described above, even if the spring pressure of the sleeve ring decreases, the sleeve ring will be pressed against the goose neck body by the hot water pressure during injection, preventing hot water from leaking. Prevented.

〔Example〕

The embodiments shown in the drawings will be described below.

In the figure, 1 is a gooseneck body with an injection chamber 1a immersed in a melting pot 2, 3 is a ceramic sleeve fitted into the injection chamber 1a, and five sleeve ring grooves 4a, 4b, 4 are provided on the outer periphery.
Sleeve rings 5a, 5b, 5 are attached to c, 4e, respectively.
c, 5d, and 5e, and each groove is provided with hot water holes 6a, 6b, 6c, 6d, and 6e that communicate with the inner wall, respectively, and an injection hole 7 that communicates with the hot water suction hole 1b of the goose neck body 1 in the upper part. is provided.

This sleeve 3 is fixed with two wedges (stop pins) 8 and 9 so that it will not come off when the plunger 10 is raised.

Now, when the plunger 10 rises as shown in the figure, the molten metal 11 in the melting pot 2 is sucked into the injection chamber 1a through the hot water suction hole 1b and the injection hole 7, and when the plunger 10 descends, as in the conventional device. The hot water in the injection chamber 1a is injected into the cavity of a mold (not shown) through the nozzle 12.

[Effect of idea]

With the conventional structure where the sleeve ring is simply fitted around the outer periphery, the melting temperature will be lower than that of aluminum.
At a high temperature of 700 DEG C., the sleeve rings 5a to 5e are annealed and lose their spring force as described above, and a gap is created between the sleeve 3 and the gooseneck body 1, causing hot water to leak during injection.

However, in the case of the present invention, the hot water pressure is increased through the hot water holes 6a to 6e in each sleeve ring, and the sleeve rings are brought into close contact with the inner wall of the goose neck body, thereby preventing hot water from leaking.

Therefore, by using heat-resistant and wear-resistant materials such as ceramics for the sleeve material, it has become possible to cast metals with high melting temperatures such as magnesium and aluminum, which was previously considered impossible with hot chamber die-casting equipment. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the main part. 1... Goosenet main body, 1a... Injection chamber, 1
b... Hot water suction hole, 2... Melting pot, 3
...Sleeve, 4a-4e...Sleeve ring groove, 5a-5e...Sleeve ring, 6a-6c
...Throughout hole, 7...Injection hole, 8, 9...Wedge (stop pin), 10...Plunger, 11... Molten metal, 12... Nozzle.

Claims (1)

[Scope of utility model registration request] A hot chamber die casting device in which a sleeve having several sleeve rings fitted around its outer periphery is fitted into an injection chamber, characterized in that the sleeve is provided with a through hole that communicates from an inner wall to a sleeve ring groove. Injection chamber of the device.