JPS5838269B2 - Molten metal filling method for vertical casting machine - Google Patents

Description

Detailed Description of the Invention The present invention is a vertical casting machine that fills a plurality of product cavities with molten metal, in which each of the plurality of product cavities is sequentially filled with molten metal in a single filling process, and each product is cast one by one. The present invention relates to a molten metal filling method that allows molten metal to be filled under substantially the same conditions as those used in the molten metal filling process.

In a vertical molding machine having a plurality of product cavities, there are the following problems in distributing molten metal into each cavity.

That is, between pouring the molten metal into the sleeve and filling it, a solidified film is formed around the molten metal stored in the sleeve, and the molten metal is pressed by the plunger from above and by the counter below. The molten metal is conveyed to the runner opening of each cavity under pressure, and the molten metal is distributed and filled into each cavity under pressure.

In this conventional molten metal distributing and filling method, pressure is applied to the molten metal using a plunger, and filling is performed by destroying the coagulated film with that pressure. Therefore, the coagulated films facing each launch opening are not destroyed at the same time, and are separated from fragile ones. The molten metal is injected into the individual cavities unevenly and irregularly, with the intention of simultaneously filling each cavity with the molten metal.

Therefore, the casting conditions for each cavity are different, causing problems such as variations in the quality of the cast product and the occurrence of casting defects.

In view of the above-mentioned problems, the present inventors have devised the present invention to solve the problem. A groove is provided and the distributor is moved vertically relative to the runner connected to the cavity to sequentially communicate the runner with the distribution groove, thereby supplying and filling multiple cavities with molten metal in one molten metal supply filling operation. The molten metal is filled into each cavity under almost the same conditions as casting one by one, and the molten metal is supplied and filled efficiently, with good workability, and with good quality and homogeneity, and with no casting defects. An object of the present invention is to provide a method for filling a vertical casting machine with molten metal, which makes it possible to obtain a cast product without any molten metal.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a vertical cross-sectional view of the vertical casting machine 1, and Fig. 2 is a longitudinal sectional view of the vertical casting machine 1.
A cross-sectional view along the line is shown.

The casting machine 1 consists of an upper mold 2 and a lower mold 3, and an injection sleeve 4 is arranged vertically in the center of the lower mold 3, and a plunger 5 is fitted below the sleeve 4 so as to be slidable in the vertical direction. has been done.

The upper end 4a of the injection sleeve 4 is provided so as to reach the same horizontal plane as the mold mating surface 3a of the lower mold 3 with the upper mold 2, and the pouring sleeve 6 faces a part of the upper part of the sleeve 4 in the radial direction. A plunger 7 is fitted into the sleeve 6 as shown in FIG.
A molten metal inlet 8 is formed in a part of the sleeve 6.

After the molten metal is supplied from the injection port 8 to the pouring sleeve 6, the sleeve is closed by the movement of the plunger 7, completing the injection process.

The upper mold 2 has a protrusion 3 that protrudes above the mold mating surface 2a with the lower mold 3.
b, and a recess 2b provided in the upper die 2. The product cavities 9 are formed between a plurality of cavities 9 and a concave portion 2b provided in the upper die 2, and the cavities 9 are arranged in plural spaces around the injection sleeve 4 described above, and in the embodiment, are arranged at equal angles. Five are provided at intervals.

Runners 10 that protrude upward are provided on the mold matching surface 2a of the upper mold 2, and the runners 10 are provided to connect each cavity 9 and the inside of the sleeve 4.
The openings 10a... are provided so as to face the upper end of the sleeve.

A guide sleeve 11 having the same diameter as the injection sleeve 4 is installed vertically in the upper die 2 concentrically with the injection sleeve 4, and a runner opening 10a is provided at the lower end of the guide sleeve 11.
... is recessed upward.

In this guide sleeve 11, a distributor 12 is attached to a rod 12a.
The distribution grooves 13 are fitted in such a way that they can be moved up and down freely by a lifting mechanism (not shown), and the same number of distribution grooves 13 are vertically provided on the circumference of the distributor 12 radially corresponding to the runner openings 10a. There is.

Each lower end 13a of the distribution groove 13... is the lower end 1 of the distributor 120.
2b to communicate with the inside of the sleeve 4, and the upper ends 13b of the grooves 13 are closed and open to the outside.

The runner openings 10a... are provided in a line so as to open on the same horizontal plane, but in the embodiment, five runner openings A to E are provided corresponding to cavities and launches, and each distribution groove 13... The lengths of the grooves 13 in the height direction are different.

That is, the lower ends 13a... of each distribution groove A-E are at the same level, but the upper ends 13b... have a height difference, and the depths are different from high ones, that is, from deep ones to shallow ones in the height direction. Ru.

FIG. 2 shows all the grooves for convenience of explanation.

In the above, the injection sleeve 4 is
The molten metal M is poured onto the plunger 5, the sleeve 6 is closed with the plunger I as described above, and the injection plunger 5 is raised after injection preparation is completed.

This state is shown in FIG. 1. In this state, the distribution groove A of the distributor 12 communicates with the runner 10 of the cavity F, while the distribution groove D of the runner 10 of the cavity H is shallow, so the distributor 12
It is closed by a surrounding wall.

As the plunger 5 rises, the molten metal M moves upward, and the distribution groove A
Since the distribution groove D and the runner 10 of the cavity F are in communication with each other, the molten metal M is supplied to the cavity F, whereas the distribution groove D and the cavity H are cut off from each other, so no molten metal is supplied to the cavity H.

As the plunger 50 further rises, the molten metal M is filled into the cavity F, as shown in FIGS. 3 and 4.

Next, the distributor 12 is moved upward, whereby the distribution groove D communicates with the lantern 0 of the cavity H, and as the plunger 50 is further moved upward, the molten metal M is supplied and filled into the cavity H. It is shown in Figure 6.

In this case, the runner 10 of the cavity F and the distribution groove A remain in communication with each other, so that the molten metal in the cavity is kept in a filled state by the upward movement of the granger 5, and after filling, the plunger is finally moved upward and the molten metal is Pressurize.

Each of the distribution grooves A to E communicates with each other at time intervals as the distributor 12 moves upward, and the molten metal is distributed and filled into the cavities F to J in sequence.

In this way, the molten metal can be sequentially supplied and filled into a plurality of cavities by vertical movement of the distributor 12, that is, the molten metal can be sequentially supplied and filled into a plurality of cavities by one molten metal supply and filling operation. Therefore, casting can be performed under substantially the same conditions as when casting one piece at a time.

In the illustrated example, cavities having the same shape and volume are filled with molten metal, but even if the cavities have different shapes and volumes, the above-described distribution and filling method allows each cavity to be filled with molten metal under substantially the same conditions.

In addition, since the molten metal is distributed and filled into multiple cavities in order, there is a risk that the temperature conditions may change depending on the cavity, but this may be done by keeping the injection sleeve warm, or keeping the area near the mold cavity warm, or even using both in combination. This can be solved by doing this.

As is clear from the above, according to the present invention, molten metal can be supplied and filled into a plurality of cavities in a single molten metal supply filling operation, and since the molten metal is sequentially supplied and filled into the cavities, in a single operation. While improving efficiency and efficiency, the quality is as good as casting one piece at a time in one cavity.
In addition to being able to obtain a homogeneous and stable cast product, it has many advantages such as being mechanically simple as the distributor is provided with distribution grooves with different heights and the distributor is simply moved up and down. .

[Brief explanation of the drawing]

The drawings show an exemplary embodiment of the present invention, and FIG. 1 is a vertical sectional view of a casting machine, FIG. 2 is an explanatory sectional view taken along the line 2-2 in FIG. 1, and FIGS. 3 to 6. 1 is an explanatory diagram showing the filling operation, and is a diagram similar to FIG. 1. In the drawings, 1 is a casting machine, 4 is a sleeve, 5 is a plunger,
9, F to J are cavities, 10 is a runner, 12 is a distributor, and 13, A to E are distribution grooves.

Claims (1)

[Claims] 1. A vertical casting machine in which the molten metal in the sleeve is pushed up by a lower plunger and distributed and supplied into a plurality of cavities through distribution grooves and launches of a distributor provided above the sleeve, and is filled with the molten metal as described above. The distributor was provided with distribution grooves having height differences, and by moving the distributor in the vertical direction, each distribution groove was sequentially connected to the launch of each cavity, and the molten metal was distributed and supplied to each cavity to fill it. A molten metal filling method for a vertical casting machine, characterized by the following.