JPS62220261A - Cooling mold for centrifugal casting - Google Patents

Abstract

PURPOSE:To remarkably lengthen service life of a metallic mold by introducing water or air to a cooling room through a peripheral part from lower part of a lower mold core in the lower mold holder laid on a rotating disk combining with an upper mold holder. CONSTITUTION:The rotating disk 6 is rotated to rotate the mold. Then, suitable quantity of molten metal is poured from a pouring gate 4 of the mold surface, to form the products 25 at a forming part of inner wall of the upper mold core 5. Then, water is introduced in the mold from a center circle hole 9 of the rotating disk 6, through a lower space 8 of the lower mold core 7 and the circle hole 9 of the peripheral part of the lower mold core 7, and through a circular hole 9 of the upper mold core 5 connected with it, and cooling water is introduced into the cooling room 10 of the peripheral face of the upper mold core 5, to cool the forming part wall. By using a device in such a constitution, the service life of the metallic mold is remarkably lengthened, and the cost is reduced.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to cooling of a rotary mold for centrifugal casting. Conventional centrifugal casting molds rotate by themselves, so this is effective. It was difficult to cool it down. On the other hand, it is a well-known fact that cooling a casting mold extends its life. The present invention aims to effectively cool rotary molds for centrifugal casting to extend the life of the molds, and has a wide range of industrial applications.

(B) Conventional technology Conventionally, rotary molds for centrifugal casting have been cooled by injecting air onto the outer surface of the rotating mold, or by cooling the mold by passing it through a tunnel-shaped cooling chamber. However, both methods have the disadvantage of poor cooling efficiency.

(C) Problems to be Solved by the Invention The rotary mold for centrifugal casting according to the present invention is used by reinforcing the outside of a small consumable mold with a holder, but in this case cooling from the outside of the holder is not effective. thin. The problem is how to cool the mold, which is wrapped inside the holder, during rotation.

(d) Means for solving the problem As mentioned above, the present invention solves the problems in the conventional technology by providing a holder and a mold with an air chamber, into which water or air is directly introduced. By doing so, it is intended to increase the effectiveness of cooling by cooling the parts that really need to be cooled.

(E) Embodiment In FIGS. 1 and 2, the upper die holder (1) and the lower die holder (2) are fitted together at the inlet part (3). The upper mold holder (1) has a circular spout (
4), and has an upper mold insert (5) built into it, and the lower mold holder (2) has a rotary plate (
6) is fitted. Furthermore, this has a built-in lower mold insert (7), and the fitting hole is such that a space (8) is created below when the lower mold insert (7) is inserted.

Furthermore, circular holes (9) are formed in the center of the rotating plate (6) and in the outer periphery of the lower mold insert (7), respectively. In addition, there is a largely cut-out space on the outer peripheral surface of the upper mold insert (5), forming a cooling chamber (10).
0) The lower through hole (12) is narrower than the upper through hole (11). Also, the upper mold insert (5
) is provided with a hole in which a gasket (13) is fitted in the upper mold holder (1) at the upper part of the outer periphery. Furthermore, a packing Qs is also applied to the circular hole (9) at the bottom of the cooling chamber (10), the lower part of the outer periphery of the lower mold insert (7), and the central circular hole (9) of the rotating plate (6). ) has been installed.

As mentioned above, the upper Poldark 1) and the lower holder (2)
The lower die holder (2) and the rotary plate (6) are assembled three-dimensionally by fitting into the inlet part (3), respectively. Three circular holes are bored inside the part (3), and a round bar-shaped slide culm 0→ and a tension spring 05) are housed in the holes. And part of the outer inlet of that part (3)
is provided with a circumferential groove (16) having the same cross-section as the tip of the zero-curve slide culm. The lower die holder (2) and the rotary plate (6) are firmly secured with bolts (1η).

In this way, the upper mold insert (5) is built into the upper mold holder (1) and the lower mold insert (7) is built into the lower mold holder (2) according to the design of each part.
), and then tighten each bolt (1η and then connect the lower mold and rotary plate (6)) (17) Place the upper mold on top of the tightened bolts. In this case, the upper mold holder (1) and the lower mold holder (2)
is equipped with a dowel pin (μs) and its insertion hole (2)) to prevent it from spinning during rotation, and the top of the mold is equipped with a dowel pin (μs) and its insertion hole (2)). The mounting bracket (A) is attached to the upper die holder (1) with a bolt (1η
It is closed. A cover is provided all around the outer periphery of the mold, and its lower end is bent to form a gutter rod. And in the gutter that was removed from the table work) No. 1
There is a drain port (24) at each location.Although the water-cooled type is illustrated and explained in this embodiment, it is also possible to remove the cover Qυ and thin through holes (In and packing α3) and implement it as an air-cooled type. be.

Furthermore, in the embodiment, the cooling chamber (10) is provided by cutting the outer peripheral surface of the upper mold insert (5), but it may also be provided by cutting the inner peripheral surface of the upper mold holder (1). It is.

Next, the embodiment shown in FIGS. 3 and 4 will be described.

In the figure, upper mold holder (1) and lower mold holder (2)
are fitted and combined at the inlet part (3).

The upper mold holder (1) has a circular pouring spout (4) on its surface, has an upper mold insert (5) built inside, and a lower mold holder (2).
has a lower mold insert (7) built-in, and is fitted with a rotary plate (6) at a part of the spigot (3) on the lower surface. Upper mold insert (
There is a cooling chamber (10) on the outer peripheral surface of the upper mold holder (1), and there is a through hole (11) leading from the outer peripheral surface of the upper mold holder (1) to the cooling chamber (10). holder(
The hole is formed in a shape that is deviated from the center line of 1) toward the direction of rotation of the mold, and its inlet has a funnel-shaped opening toward the direction of rotation of the mold. Also, a circular hole (9) communicating with the outside is provided in the upper part of the cooling chamber σ0). Part of the inlet of the upper mold holder (1) and lower mold holder (2) (
3) A circular groove is bored at an angle of about 30 degrees inside the groove, and a steel ball is housed in it. Approximately 1 of the steel balls (5) are placed in the outer inlet part (3) of that part.
A groove (16) having a shape into which a ./2 can be fitted is provided over the entire inner circumference of the upper die holder (1) side.

According to the design of each part, the upper mold insert (5) is built into the upper mold holder (1) and the bolts (17) are tightened, and the lower mold insert (7) is built into the lower mold holder (2). Then, tighten the bolts α7) and place the upper mold on top of the lower mold and rotary plate (6) that have been tightened with the bolts (17). In this case, the upper mold holder (1) and the lower mold holder (2) have a dowel pin μs) and its insertion hole (19
) is provided to prevent spinning during rotation.

(Function) To explain the function of the embodiment of the present invention, the mold is rotated by the rotation of the rotary plate (6), and when an appropriate amount of molten metal is poured from the pouring port (4) on the surface of the mold, the molten metal is poured into the mold. Centrifugal force is applied, and the molded part of the inner wall of the upper mold insert (5) is thrown and hard
). Then, the upper mold is opened, the product is taken out, and the process is repeated by pouring the metal again.

During this process, distortion occurs in the molded part of the upper mold insert (5) due to repeated heating and cooling, and eventually cracks or deformation occur in that part, resulting in the end of the life of the upper mold insert (5). It is.

The present invention introduces water into the mold and operates it while cooling with water, thereby suppressing the temperature rise of the upper mold insert (5) during pouring, thereby preventing the distortion caused by heating and cooling as described above. The purpose is to maintain the mechanical strength of the mold and extend the life of the mold. In other words, the water that entered the mold from the center circular hole (9) of the rotary plate (6) will flow into the space (8) below the lower mold insert (7).
), through the circular hole (9) on the outer periphery of the lower mold insert (7), and the circular hole (9) of the upper mold insert (5) connected thereto,
It enters the cooling chamber αO) on the outer peripheral surface of the upper mold insert (5) and cools the wall of the molding section from the outside. And the upper mold holder (
1) is discharged from the mold through the through hole C11 door 12) leading to the outer surface of the mold, and is collected by the cover Q1) and drained through the drain port Q4.
It is then placed in a water tank, pumped up again, and sent into the mold.

Next, to explain the function of the lower thin through hole (6) through which water is discharged from the cooling chamber (10), when the product is formed in the mold, the water supply to the mold is stopped and the mold is closed. Stop rotation. Then, the water in the cooling chamber (10) in the mold is discharged out of the mold through the narrow through hole (12). After that, the upper mold holder (1) is pulled up and the product on the lower mold insert (7) is taken out. After cleaning the mold, the upper mold is returned to the lower mold surface, the mold is assembled, and the pouring process is repeated.

Next, to explain the action of the slide holder 04) of the inlet part (3), the mold according to this example has an upper mold holder (1) containing an upper mold insert (5) mounted on the rotary plate (6). The structure is such that the screwed lower mold insert (7) is simply placed on the lower mold holder (2), which has a built-in lower mold insert (7). Installing the slide culm α in 3) serves as a means of locking the upper mold holder (1) and lower mold holder (2) during rotation. In other words, when the mold is not rotating, this slide culm α → is pulled by the tension spring (15) and pulled into the inside of the inlet part (3) to release the locked state, and when the mold rotates, the slide culm α → Due to the force, the slide culm (14) pops out against the force of the tension spring (15), and as shown in the figure, the tip part is fitted into the groove α6) in a part of the outer spigot, and the upper die holder (1) floats. This creates a locking force. Since it is quickly retracted when the rotation stops, it also serves as a quick locking and releasing means when opening the upper mold.

Next, to explain the operation of the embodiment shown in Figs. 3 and 4, when the mold rotates, the steel balls (b) in the inlet parts (3) of the upper and lower molds are moved by centrifugal force into the circular groove @ Hitoshi no Slope. As shown in Figure 1, it fits into the entire circumferential groove (IQJ) of the outer inlet part (3) and is locked to the upper mold i and the lower mold.Then, when the rotation reaches its peak, the pouring hole ( When an appropriate amount of molten metal is poured from step 4), centrifugal force acts on the molten metal, causing it to be thrown onto the molding part of the inner wall of the lower mold insert (5) and harden into a product.Meanwhile,
As the mold rotates, air enters through the through hole (1υ) on the outer periphery of the upper mold holder (1), passes through the cooling chamber (10), and is discharged out of the mold through the upper circular hole (9).

In this process, the upper mold insert (5) is cooled from the outer periphery, which lowers the maximum temperature reached by repeated pouring of the upper mold insert (5), which may lead to cracks, distortions, etc. This means that it will suppress the

(G) Effects of the invention Conventionally, since the molds used in centrifugal casting are rotary molds, there is no effective cooling method, and as a result, the life of the molds is short, and mold costs that account for direct manufacturing costs are high. (In addition to the negative effects of frequent mold replacement, productivity was lowered.) However, by implementing the present invention, the life of the mold can be significantly extended, reducing the cost and productivity. The positive effects on both sexual aspects are extremely significant.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a plan view showing a different embodiment of the invention, and Fig. 4 is a longitudinal sectional view thereof. be. Explanation of symbols

Claims (2)

[Claims] (1) The upper mold holder (1) containing the upper mold insert (5) and the lower mold holder (2) containing the lower mold insert (7) are combined and placed on the rotating plate (6), Water or air taken in from the central circular hole (9) of the rotating plate (6) flows into the lower mold insert (
7) A cooling mold for centrifugal casting, characterized in that the mold is introduced from below through the outer circumference into the cooling chamber (10). (2) A through hole (
11) The cooling mold for centrifugal casting according to claim 1, wherein the air taken in by using the rotation of the mold is introduced into the cooling chamber (10).