JPS5854906B2 - Molten metal filling method for vertical casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for filling molten metal in a vertical casting machine in which molten metal stored in a lower sleeve is smoothly filled into a plurality of cavities through a plunger and each cavity is filled at the same timing. It is about the method.

For vertical molding machines having multiple product cavities, the following problems arise in distributing molten metal into each cavity.

In other words, 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 pressurized by the plunger from above and by the counter below. The molten metal is delivered to the launch opening of each cavity, filled under pressure into the cavity, and distributed to fill the molten metal.

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 runner opening are not destroyed at the same time, and are separated from fragile ones. It has been destroyed, and the order of pouring molten metal into each cavity has been established, making it impossible to fill each cavity with molten metal at the same time.

Therefore, preset conditions, such as injection speed and timing, cannot be satisfied, leading to problems such as variations in the quality of the cast product and casting defects.

Therefore, the present applicant has developed a new method for filling molten metal in order to be able to distribute and fill molten metal evenly and simultaneously into multiple cavities smoothly, improve the quality of cast products, and obtain products of uniform quality. provided a method.

That is, the molten metal in the sleeve is pushed up by a lower plunger and distributed and supplied into a plurality of cavities via launches,
At the same time as filling, a distributor is provided above the sleeve, and a distribution groove in the vertical direction connecting the upper runner opening and the inside of the lower sleeve is provided in this distributor, and the molten metal is distributed and supplied into each cavity through the distribution groove. , to fill.

Although such a filling method is significantly improved over the conventional method, there are still problems such as resolution.

That is, when filling molten metal into multiple cavities, since there are multiple cavities, air existing in each cavity,
Exhaust gas etc. become obstacles and resistance when filling the molten metal, and the pressure due to the air etc. in this cavity varies depending on the individual cavities, so it is difficult to fill the molten metal into each cavity at exactly the same timing. In addition, it is difficult for the molten metal to be filled to every corner due to air, etc., and there is also a risk that air, etc. existing in the cavity may be drawn in and create cavities.
It is difficult to guarantee uniform quality.

The present inventors have achieved the present invention in order to further improve the effectiveness of an improved molten metal filling method for a vertical casting machine having multiple cavities, and to obtain a plurality of cast products of good quality and completely homogeneous. .

It is also an object of the invention to provide an improved method for filling molten metal,
Fill the molten metal with the upper part of the cavity open to the atmosphere,
The air, exhaust gas, etc. inside the cavity is released to the atmosphere, and the molten metal is distributed, supplied, and filled at the same time through the distributor and distribution groove, and the influence of the air, exhaust gas, etc. inside the cavity due to this filling is eliminated. The molten metal can be smoothly filled at the same time and at the same time without being affected by air, etc., and furthermore, the opening can be closed immediately before the filling is completed, and preferably the molten metal filled with a closing member can be filled with the molten metal. To provide a method for filling molten metal in a vertical casting machine, which pressurizes the molten metal and makes it possible to obtain a homogeneous product of good quality and free of casting defects such as blowholes.

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

FIG. 1 shows a vertical cross-sectional view of a vertical casting machine 1 for carrying out the present invention, and FIG. 2 shows a cross-sectional view taken along the line 2--2.

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 in the lower part of the sleeve 4 so as to be slidable in the vertical direction. ing.

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 with the upper mold 2, and a pouring sleeve 6 faces a part of the upper part of the sleeve 4 in the radial direction. As shown in the figure, the plunger 7 is fitted and the sleeve 6
A molten metal inlet 8 is formed in a part of the hole.

After the molten metal is supplied from the injection port 8 to the pouring sleeve 6, the pouring sleeve 6 is closed by the movement of the plunger 7, and preparation for injection is completed.

The upper mold 2 has a protrusion 3 that protrudes above the mold matching surface 3a of the lower mold 3.
2b and a recess 2b provided in the upper mold 2, and a plurality of cavities 9 are provided radially around the injection sleeve 4 described above.

The mold mating surface 2a of the upper mold 2 is provided with runners 10 that extend upward, and the runners 10 are provided to connect each cavity 9 and the inside of the plunger 4, and the runners 10 are provided with launch openings. The portion 10a faces the upper end of the sleeve 4.

A distributor 11 is provided in the center of the upper mold 2 to close the upper part of the injection sleeve 4 of the lower mold 3, and a hanging part 11a of the distributor 11 enters the upper part of the injection sleeve 4.

Concave grooves 12 .
It opens downward around the inner diameter of the runner 10, and the upper part communicates with the opening 10a of each runner 10 radially outward to form a distribution groove.

The downwardly opening inlet part of the distribution groove 12... is the hanging part 1
1a is curved at the lower end and also curved outward at the upper end to improve swirl flow.

A sleeve 13 is vertically installed in the center of each recess 2b forming the cavity 9 of the upper die 2 through the vertical mounting hole 2c, and the lower end 13a of the sleeve 13 is connected to the upper surface of the recess 2b. That is, it opens in the ceiling of the cavity 9, and the sleeve 13
The upper end 13b is open to the upper surface of the upper die 2, so that the inside of the cavity 9 communicates with the atmosphere via the sleeve 13.

Plungers 14, which are closing members, are provided concentrically on this sleeve 13 so as to be movable up and down.
The plungers 14... are driven up and down by individual cylinder units 15... above, and the units 15... are driven up and down by a common cylinder unit 17 via a support plate 16. Ru.

As described above, the molten metal M is poured into the injection sleeve 4, and the molten metal M is received on the plunger 5 and stored in the sleeve 4, as shown in FIG. 1, with the closing plunger 14 in the raised position. to open the sleeve 13, thereby opening the cavity 9 to the atmosphere.

In this stored state, a shell-like solidified film is formed around the portion of the molten metal M that contacts the inner diameter portion of the sleeve 4 .

On the other hand, the upper surface M1 of the molten metal is open, and no solidified film is formed, or even if it is formed, it is so thin that it is easily destroyed.

Next, the plunger 5 is raised, and the molten metal M moves upward.
The upper surface of the molten metal M hits the hanging part of the distributor 11 that has entered the upper part of the sleeve 4, and a part of the molten metal M, that is, the distribution groove 12...
The part corresponding to ・ is lifted without hitting the groove 12
. . . It reaches the opening 10a where it runs while rising inside, and carries through the runner 10.

It flows into the cavity 9, and the cavity 9 is the protrusion 3b in the figure.
Since it is formed to surround the , it is filled from the lower to the upper.

When this molten metal M flows into the cavity 9, the cavity 9
Air, exhaust gas, etc. inside the cavity 9 are released to the atmosphere through a sleeve 13 that connects the atmosphere and the cavity 9.

Therefore, each cavity is under the same conditions, and when the molten metal is filled into the cavity 9, there is no resistance from the air in the cavity, exhaust gas, etc., and the molten metal is filled uniformly and smoothly in each cavity, and the air, etc. No entanglement occurs.

Immediately before filling is completed, each plunger 14 is moved downward,
The plunger 14 was fitted into the sleeve 13 to close the sleeve, thereby blocking the cavity 9 from the atmosphere, as shown in FIG.

After filling each cavity 9 with molten metal, plunger 1
4 is further moved downward, thereby pressurizing the molten metal in the cavity 9. This allows filling while replenishing the molten metal in accordance with the solidification shrinkage, thereby preventing the occurrence of shrinkage cavities and the like.

This is shown in Figure 4.

Air, exhaust gas, etc. remaining between the cavity and the sleeve 13 after the cavity and the atmosphere are shut off are discharged from a small clearance between the sleeve 13 and the plunger 14.

After the molten metal solidifies, the mold is opened and multiple cast products are taken out.

As is clear from the above, according to the present invention, it is possible to distribute, supply, and fill the molten metal uniformly and simultaneously into multiple product cavities using the distributor and the distribution groove, so that multiple products can be homogenized under the same conditions. Therefore, it is possible to perform casting with good quality and fewer casting defects.In particular, air and exhaust gas inside the cavity are discharged from the open part, and the pressure conditions in each cavity are all uniform, which reduces the effects of the distributor and distribution groove. In addition, it is possible to fill each cavity with molten metal completely uniformly and at the same time, and there is no entrainment of air due to residual air in the cavity, and it is possible to produce multiple cast products of good quality without blowholes etc. can be obtained at the same time.

In addition, by pressurizing the molten metal by the closing member of the open part, filling can be performed while replenishing the molten metal according to the solidification shrinkage, preventing the occurrence of shrinkage cavities, etc., further improving quality, and making it possible to obtain stable cast products. It has many advantages.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical side view of a vertical molding machine, FIG. 2 is a sectional view taken along line 22 in FIG. 1, and FIG.
The figure is the same as FIG. 1 before the molten metal filling is completed, and FIG. 4 is the same view as FIG. 1 in the pressurized state after the molten metal filling is completed. In the drawing, 1 is a vertical casting machine, 4 is a sleeve, 9 is a cavity, 11 is a distributor, 12 is a distribution groove, 13 is an open part, 14
is a closing member.

Claims (1)

[Claims] 1. A vertical casting machine in which each of a plurality of product cavities is filled with molten metal stored in a lower sleeve via a distributor, in which the upper part of each cavity is exposed to the atmosphere. Each cavity is filled with molten metal via a distributor in an open state, and the open portion of the cavity is closed with a closing member immediately before the filling of the molten metal into each cavity is substantially completed. Method of filling molten metal into mold casting machine. 2. The molten metal filling method for a vertical casting machine according to claim 1, wherein the closing member pressurizes the molten metal filled in each cavity.