JPH04231161A - High pressure casting device - Google Patents

Abstract

PURPOSE:To present the high pressure casting device which can perform many pieces layout by eliminating the difference of the pressure applying to four cavities, at least, in the die. CONSTITUTION:Plural sleeves to pressurize the molten metal are set, and each sleeve pressurizes the molten metal in a pair of cavities in the die, so the respective distances of the gate are made equal mutually.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure casting apparatus, and more particularly to a high-pressure casting apparatus in which a molten metal poured into a cavity in a mold is solidified under pressure, and then the mold is opened to take out a cast product. .

0002

[Prior Art] For example, in order to cast a piston for a diesel engine by a high-pressure casting method, it has been conventionally shown in FIG.
A high-pressure casting device like the one shown in Figure 1 was used. This high-pressure casting apparatus 1 is connected to a sleeve 2 for supplying molten metal. There is a pressing tip 3 inside the sleeve 2.
are slidably fitted together, and this chip 3 is pressed by the injection cylinder 4.

As shown in FIG. 4, a pair of cavities 7 are arranged in the high-pressure casting apparatus 1, and the molten metal injected by the sleeve 2 is supplied to the cavities 7 through the gate 5. , the pressure applied by the injection cylinder 4 causes the molten metal to solidify in the cavity 7 under pressure.

0004

As shown in FIG. 4, only two cavities 7 can be arranged in the high-pressure casting apparatus 1, so there is a problem in that it is not possible to perform multi-cavity casting. In other words, if the gate 5 that communicates with the sleeve 2 is branched as shown in FIG. 5 and thereby supplies molten metal to each of the four cavities 7 in the casting device 1, the cavities 7 on both sides will be connected to the cavity 7 at the intermediate position. Since the distance between the gates is longer than that of the conventional method, a pressure difference occurs due to pressure loss due to the difference in distance, making it impossible to perform uniform casting, resulting in variations in the product. In other words, the conventional high-pressure casting apparatus had a structure that was not suitable for producing a large number of pieces.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a high-pressure casting apparatus capable of producing a large number of pieces.

[0006]

[Means for Solving the Problems] The present invention provides an apparatus in which a molten metal injected into a cavity in a mold is solidified under pressure, and then the mold is opened to take out a cast product.
A plurality of sleeves are provided for pressurizing the molten metal, and each sleeve pressurizes the molten metal in a pair of cavities.

[0007]

[Operation] Therefore, each sleeve supplies molten metal into the corresponding pair of molds, and the molten metal in the molds is solidified under pressure. After solidification, the mold is opened and the cast product is removed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a high-pressure casting apparatus 10 according to an embodiment of the present invention, and this high-pressure casting apparatus 10 is connected to a pair of sleeves 11. As shown in FIG. A pressing tip 12 is slidably fitted into each sleeve 11 . And the press tip 12 is connected to the injection cylinder 13
The inner piston 14 and piston rod 15 are connected to each other.

A mold 17 is arranged inside the high-pressure casting apparatus 10 as shown in FIG. The two cavities 18 on the left side in the mold 17 are connected to a branched end side portion of a common first gate 19. On the other hand, the pair of cavities 18 on the right side are connected to the second gate 20 on the right side.
It is designed to be connected to the forked tip of the That is, each sleeve 11 has a pair of cavities 18.
and are connected via gates 19 and 20.

In the above configuration, the left and right injection cylinders 13 shown in FIG. 1 are operated, and the piston 14 is moved as shown in FIG.
When pressed upward, the tip 12 connected to the piston rod 15 of the piston 14 moves forward within each sleeve 11 and pressurizes the molten metal within the sleeve 11. The pressurized molten metal enters a pair of cavities 18 through gates 19 and 20 shown in FIG.
will be supplied to The molten metal in the mold 17 is then solidified under pressure.

According to such a high-pressure casting apparatus, as is clear from FIG. 3, the four cavities 18 make it possible to simultaneously perform high-pressure casting of four high-pressure cast products, for example, four pistons. In other words, four pieces can be taken. Moreover, each cavity 18 is connected to a branched part on the tip side of the gate 19 or 20, and since there is no difference in the distance between the gates 19 and 20 among the four cavities 18, each cavity Uniform pressure is now applied to 18. Therefore, even if a large number of pistons are produced, there will be no variation in quality among the pistons. Therefore, productivity can be improved without deteriorating quality.

FIG. 2 shows a modified high-pressure casting apparatus in which a single injection cylinder 13 moves chips 12 within a pair of sleeves 11. That is, rods 23 and 24 are attached to the tip of the piston rod 15 of the injection cylinder 13 via a connecting bar 25, and the tips 12 of the left and right sleeves 11 are attached to the tips of these rods 23 and 24. I'm trying to install it.

Even in this configuration, since the cavities 18 and the gates 19, 20 of the casting device connected to each sleeve 11 are arranged as shown in FIG. You will get a piston. Moreover, since the arrangement of the gates 19 and 20 is the same as in the above embodiment and has the structure as shown in FIG. 3, there is no difference in the distance between the gates 19 and 20 of each cavity 18. There is no difference in the pressure applied to each cavity 18. Therefore, in this modification as well, it is possible to produce a large number of pieces without deteriorating quality, and to improve productivity. Moreover, according to this modification, the injection cylinder 1
Since the number 3 is commonly used for the pair of sleeves 11, only one is required.

[0014]

As described above, the present invention provides a plurality of sleeves for pressurizing molten metal, and each sleeve pressurizes the molten metal in a pair of cavities. Therefore, it becomes possible to simultaneously cast a large number of castings using a large number of cavities without creating a difference in the pressure applied within each cavity, and it becomes possible to provide a high-pressure casting apparatus capable of producing a large number of pieces.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of a high-pressure casting apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of essential parts of a high-pressure casting apparatus according to a modification.

FIG. 3 is a cross-sectional view showing the arrangement of cavities within the mold.

FIG. 4 is a cross-sectional view showing the arrangement of cavities in a mold of a conventional high-pressure casting apparatus.

FIG. 5 is a sectional view of a conventional casting device that performs multi-cavity casting.

FIG. 6 is a plan view showing main parts of a conventional high-pressure casting apparatus.

[Explanation of symbols]

10 High pressure casting device 11 Sleeve 12 Pressing tip 13 Injection cylinder 14 Piston 15 Piston rod 17 Mold 18 Cavity 19 First gate 20 Second gate

Claims (1)

[Claims] 1. An apparatus in which a molten metal injected into a cavity in a mold is solidified under pressure, and then the mold is opened to take out a cast product, wherein a plurality of sleeves are provided for pressurizing the molten metal, A high-pressure casting device characterized in that each sleeve pressurizes the molten metal in a pair of cavities.