JPS5834222B2 - Vertical die casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical die-casting machine that is capable of low-pressure injection, has little air entrainment, and can be provided with a melting device at the top of the machine.

Initially, vertical die-casting machines such as the Eckert type and Polak type were the mainstream, but in recent years, horizontal machines have come to be used mainly due to larger machines, adoption of hydraulic equipment, and reduction in cycle time.

However, horizontal machines such as the Etzkert type pour molten metal with the mold open and then close the mold before injecting, which has the disadvantage that the poured molten metal tends to solidify inside the sleeve and the cycle time is long. there were.

In order to solve this drawback, a vertical die-casting machine that can pour metal in a closed state has been proposed, which has the advantages of low-pressure injection and little air entrainment, as proposed by Carr in U.S. Pat. No. 3,534,802. Since its introduction, it has been under review for the past three to four years.

However, conventional vertical die-casting equipment, such as the Carl process, uses a method of injecting from the top of the mold downwards, which requires a counter piston, poses a problem of keeping the sleeve warm, and requires a melting device. This has the disadvantage that the pouring device cannot be provided on the upper part of the die casting, which complicates the pouring device.

In order to solve the drawbacks of conventional die casting machines such as horizontal machines or vertical machines, the present invention is capable of pouring and immediately injecting metal in a closed mold state, and injecting from the bottom to the top, and installing a melting device above the machine. It is an object of the present invention to provide a vertical die-casting device that can be installed.

Embodiments of the vertical die casting apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment, and in the figure, reference numeral 1 denotes a fixed plate fixedly supported above a lower plate 3 by tie rods.

A movable plate 4 is interposed between the lower plate 3 and the fixed plate 1 so as to be movable in the vertical direction by a mold clamping cylinder 2.

An upper mold 5 is mounted on the lower surface of the fixed plate 1, and a movable plate 4 is mounted on the lower surface of the fixed plate 1.
A lower mold 6 is attached to the upper surface, and as the movable plate 4 moves up and down, both the upper and lower molds 5 and 6 move toward and away from each other in the vertical direction.

A runner 7 extending in the vertical direction is formed in the upper mold 5, and the upper end of the runner T functions as a pouring lower a.

The lower mold 6 has a runner I that functions as an injection sleeve 7b.
is formed coaxially with the runner I formed in the upper mold 5 and extending in the vertical direction.

Recesses are formed at appropriate locations on the mating surfaces of the upper and lower molds 5 and 6, so that a cavity 8 is formed by the recesses when the upper and lower molds 5 and 6 are brought together.

The lower mold 6 has a passage 9 that communicates the cavity 8 with the runner 7.
is formed.

A melting device 10 is disposed above the upper mold 5 and directly above the runner 7.

Further, a tip 13a of an injection plunger 13 is slidably inserted into the runner 7 functioning as an injection sleeve 7b of the lower mold 6 from below, and the injection plunger 13 is inserted into the injection cylinder 14 in the vertical direction. It is designed to be driven by

A stopper 15a of a shut-off plunger 15 for opening and closing the runner 7 is provided on the upper mold 5 so as to be movable in the horizontal direction, and the shut-off plunger 15 is reciprocated horizontally by a shaft-off cylinder 16. It has become.

The lower surface of the stopper 15a is aligned with the lower surface of the upper mold 5, that is, the mold dividing surface, and when the runner T is closed by the stopper 15a and the injection plunger 13 rises to the upper end position of the lower mold 6, the molten metal is It is designed so that it does not remain in the hot water channel T.

An extrusion rod 1T is slidably inserted into the upper mold 5 with one end facing the cavity 8, and the extrusion rod 17 is slid vertically by an extrusion cylinder 19 via an extrusion plate 18. It is designed to be driven freely.

The operation of the device having the above configuration will be explained.

First, the movable plate 4 is pushed up by the mold clamping cylinder 2, and the upper and lower molds 5 and 6 are clamped.

At this time, the shutoff plunger 15 is open.

Immediately after the molten metal melted in the melting device 10 is poured through the pouring lower a, the shutoff cylinder 16 is activated and the runner 7 is shut off by the stopper 15a.

Thereafter, the injection plunger tip 13a is driven upward, and the cavity 8 is filled with the molten metal within the injection sleeve 7b.

After solidification, the lower mold 6 is moved downward and the extrusion cylinder 19 extrudes the product.

FIG. 2 shows a device according to a second embodiment of the present invention, and parts similar to those in the first embodiment are given the same reference numerals as in FIG. 1, and their explanation is omitted. Only the parts that differ from the example will be explained.

First, the upper and lower molds 5 and 6 are interposed between the lower plate 3 and the movable plate 4, the upper mold 5 is attached to the lower surface of the movable plate 4, and the lower mold 6 is attached to the upper surface of the lower plate 3. There is.

The runner 7 is formed near the periphery of the upper and lower molds 5°6, and a cavity 8 is formed in the center.

At the bottom of the fixed plate 1, there is an extrusion rod 2 extending downward.
0 is planted, and the pushing rod 20 is inserted through a hole provided in the moving plate 4 to push the pushing plate 18.

The operation of the apparatus having this configuration is similar to that of the apparatus of the first embodiment, but when extruding the product, the moving plate 4 is pushed up,
This is done by applying the extrusion rod 20 to the extrusion plate 18.

Therefore, the extrusion cylinder 19 of the first embodiment becomes unnecessary.

When using the vertical die-casting machine of the present invention, it has all the effects of a normal vertical die-casting machine, that is, low-pressure injection is possible and little air entrainment, and the injection plunger is fitted from below the runner that extends in the vertical direction. Since the melting device is inserted above the device and directly above the runner without interfering with the injection plunger, it is possible to simplify the device and facilitate pouring.

In addition, the runner is equipped with a shut-off plunger that moves horizontally to open and close the runner, so the runner can be shut off immediately after pouring, allowing immediate injection, preventing solidification inside the sleeve, and reducing cycle time. It is possible to reduce the size.

Furthermore, since the lower surface of the stopper of the shut-off plunger is aligned with the mold dividing surface, it is possible to improve the yield of molten metal and also to solve the problem of thermal expansion without difficulty.

Although this device is particularly suitable for die-casting high-melting point metals, it is also effective for other ordinary die-casting.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a first embodiment of the vertical die-casting apparatus of the present invention, and FIG. 2 is a cross-sectional view of a second embodiment of the vertical die-casting apparatus of the present invention. 1... Fixed plate, 4... Moving plate, 5...
・Upper mold, 6... Lower mold, 7... Runway, 7b...
Injection sleeve, 8... Cavity, 10... Melting device, 13... Injection plunger.

Claims (1)

[Claims] 1 A runner is formed in the vertical direction in the upper and lower molds of vertical die casting, a melting device is provided above the runner, an injection plunger is inserted into the runner from below, and a shutoff is installed in the upper mold to open and close the runner. A vertical die-casting device characterized in that the lower surface of a stopper of a plunger is movable in the horizontal direction in alignment with the mold dividing surface.