JPS6167555A - Injection sleeve for die casting - Google Patents

Abstract

PURPOSE:To provide a higher cooling effect and a longer life and to avert an increase in cost even if an exchangeable costly heat resistant material is used for an inside cylinder by constituting a sleeve for injection of a molten metal into inside and outside double-construction cylinders and passing cooling water therebetween. CONSTITUTION:The molten metal admitted through the feed port 2 to the inside cylinder 5 for injection is fed through an injection hole 3 into a metallic mold M when pressed P by a plunger. An outside cylinder 4 is mounted to the outside circumference of the cylinder 5 and cooling water is passed W therebetween 6 by which the cooling effect of the cylinder 5 is improved and the life is extended. Even if the exchangeable heat resistant high-grade alloy material is used for the cylinder 5, the increase in the cost is averted by the long life thereof.

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]

Injection sleeves, which are generally installed in die-casting machines that cast metal parts such as cylinder heads and camera bodies for automatic high-speed vehicles, are used to pour the molten metal to be cast into the injection sleeve, and then the plunger moves the plunger to create the metal parts under high pressure and high speed. Since it is used as a conduit to be injected into the mold, it is exposed to very high temperatures and therefore requires heat-resistant material properties.

In particular, in recent years, surface-treated refractory metals such as molybdenum alloys and tungsten alloys have been used as injection sleeves that can handle high-temperature molten metals exceeding 1000°C. It had the problem of a short service life due to deterioration.

[Purpose of the invention]

Therefore, the present invention solves the above-mentioned conventional problems and makes the molten metal injection sleeve a double structure with a cooling water jacket consisting of an inner cylinder and an outer flip, thereby increasing the cooling effect and extending its service life. The objective is to reduce costs by using expensive materials only for the inner cylinder.

[Structure of the invention]

The die-casting injection sleeve of the present invention is constructed by configuring the molten metal injection sleeve to have a double structure of an inner cylinder and an outer flip, and forming a cooling water hole between the inner cylinder and the outer cylinder. be done.

〔Example〕

The present invention will be described in detail below with reference to the drawings, and FIG.
The figure is a front sectional view taken along the line AA in FIG. 1.

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 pouring hole of the mold, and also indicated by the arrow P on the left side of the figure. On the other side, a plunger that is reciprocated by an appropriate drive means is about to be closely inserted into the inner peripheral surface of the injection hole 3, and furthermore, on the plunger side indicated by P, there is an inlet for metal/8 hot water. 2 is provided through the injection sleeve 1 so as to communicate with the injection hole 3.

Therefore, in this embodiment, the injection sleeve 1 has a double structure consisting of an outer cylinder 4 and an inner cylinder 5 fitted therein, and a cold water jacket is provided between the outer cylinder 4, the inner surface, and the link 5. 6, and the cooling water is introduced into the cooling water jacket 6 from the water injection lower part as shown by the arrow W, and is discharged from the water discharge port 8, so that the inner cylinder 5 in particular is sufficiently cooled from the outer periphery. There is.

As shown in FIG. 2, the cooling effect of the inner cylinder 5 of the cooling water outlet 6 is further enhanced by providing a large number of slits 9 in the inner cylinder 5.

〔Effect of the invention〕

The die of the present invention having the above configuration; l=J
The outer sleeve has a double structure of an inner cylinder and an outer cylinder to form a cooling water jacket.
It has a large cooling effect and is effective in extending its usage life.

In addition, it has a double structure, and the outer cylinder is the same as the conventional Gli [
Since only the inner cylinder can be made of expensive high-grade heat-resistant alloy or the like, costs can be reduced accordingly, and there is also the advantage that only the inner sleeve can be replaced.

[Brief explanation of the drawing]

FIG. 1 is a y-cross sectional view of a die casting injection sleeve installed in a die cast 1-casting machine in an embodiment of the present invention, and FIG. 2 is a front sectional view taken along the line A-A in FIG. ■...Injection sleeve, 4...Outer cylinder, 5...
・Inner cylinder, 6...Cooling water jacket.

Claims (1)

[Claims] A die-casting injection sleeve characterized in that the sleeve for molten metal injection has a double structure of an inner cylinder and an outer cylinder, and a cooling water jacket is formed between the inner cylinder and the outer cylinder.