JPH034426Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold device in a vertical centrifugal casting machine for casting hollow cylindrical castings having a spherical outer surface.

(Prior Art) As a general mold device for a vertical centrifugal casting machine, the one described in, for example, Japanese Patent Application No. 87217/1987 is known.

According to the above-mentioned conventional mold device, the mold body is fixed on the rotary table of the rigid centrifugal casting machine,
A top cover is detachably attached to the casting opening at the top of the mold body, and the top cover is fixed to the mold body by a locking set pin inserted into the top of the mold body.

(Problems to be solved by the invention) In the above-mentioned conventional mold device, when pouring molten metal into the mold body and performing centrifugal force casting, the molten metal inside the mold body presses the top lid upward due to centrifugal force. .

This pushing up force acts as a tensile force on the mold body via the locking set pin.

However, since a large tensile force acts on the mold body at high temperatures, from the standpoint of safety, the body must be made of strong and expensive materials such as carbon steel cast steel or carbon steel forged steel. There was a problem that the main body could not be manufactured at low cost.

Therefore, the present invention has been developed so that the mold body can be manufactured at a low cost, and by replacing a part of the mold device without replacing the entire mold device, molds with different inner diameters can be made, and various types of molds can be produced. The purpose of the present invention is to provide a mold device that can easily accommodate various product diameters.

(Means for solving the problems) The present invention takes the following measures to achieve the above object. That is, the feature of the present invention is that an outer cylinder into which a mold is removably inserted is provided on the rotary table of a rigid centrifugal casting machine, and is concentric with the table. A mounting surface stepped portion is formed at the upper part of the interior, and the mold consists of a main body divided into upper and lower parts, and an upper cover and a lower cover that are removably attached to the upper and lower parts of the main body, and the mold main body is A protrusion that is removably placed on the step of the mounting surface is provided on the upper part in a radially outward direction, and when the protrusion is placed on the step of the placement surface, the table and the mold are spaced apart from each other by a predetermined distance in the vertical direction, a stopper is provided at the top of the outer cylinder to prevent the mold from moving upward with respect to the outer cylinder, and an engaging part for centering with the table is formed on the lower cover. It is in the point that it is.

(Function) According to the present invention, the mold body is suspended in the outer cylinder at its upper part. Therefore, the force pushing up the molten metal acting on the top lid due to centrifugal force is:
This upward force merely acts on the stopper, and does not generate any tensile force inside the mold body.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 2 shows a rigid centrifugal casting machine, and the casting machine is
A casting machine main body 1 in a rigid facing position, and a mold device 3 detachably provided on a rotary table 2 of the casting machine main body 1.
, a drive device 5 shown as an electric motor that rotates the mold device 3 around a rigid axis via a belt transmission device 4 and the casting machine main body 1, and a pouring gutter 6 for injecting molten metal into the inside of the mold device 3. and a lifting device 7 for lifting and lowering the pouring gutter 6.

As shown in FIG. 1, the mold device 3 includes an outer cylinder 8, upper and lower split mold bodies 9 and 10 that are removably fitted inside the outer cylinder 8, a stopper 11, and the like.

The outer cylinder 8 has a cylindrical shape with vertical openings and is made of carbon steel cast steel material, carbon steel forged steel material, etc., and is removably attached concentrically to the table 2 with bolts and nuts 12. At the upper part of the inner circumferential portion of the outer cylinder 8, a horizontal link-shaped mounting surface stepped portion 13 having a planar shape on the upper side is formed.

The mold consists of a main body with a spherical inner surface, which is assembled with upper and lower molds 9 and 10 using bolts and nuts 14, a lower cover 15 that is removably fitted to the lower end of the main body, and a lower lid 15 that is removably fitted to the upper end of the main body. Mold bodies 9 and 10 comprising an upper lid 16 etc., an upper lid 16 and a lower lid 1
5 is made of various cast iron materials such as ductile cast iron, and linings 17 and 18 made of refractory material are adhered to the inner surfaces of the upper lid 16 and the lower lid 15.

A portion 19 projecting outward in the radial direction is provided on the entire outer periphery 8 portion of the upper end of the mold body 9, and this protruding portion 19 is placed on the mounting surface stepped portion 13 of the outer cylinder 8. As a result, the mold bodies 9 and 10 are provided in a state separated from the table 2.

The upper lid 16 is provided at the upper end of the mold 9 by a plurality of removable taper pins 20 equally distributed in the circumferential direction.

Like the upper lid 16, the lower lid 15 has a taper pin 21.
and is held in the mold body 10 at a predetermined distance from the table 2 in the vertical direction.
Further, at the center of the lower surface of the lower lid 15, an annular protrusion 2 is provided.
2 is formed, and the mold is positioned with respect to the table by removably fitting the protrusion 22 into a protrusion 23 that protrudes upward from the center of the table top surface with a spigot. That is, this protrusion 22 is used as a centering engagement part.

A plurality of hanging bolt screw portions 24 are formed downwardly on the upper end surfaces of the mold bodies 9 and 10 and are equally spaced in the circumferential direction.

The stopper 11 prevents the mold bodies 9 and 10 from moving upward with respect to the outer cylinder 8, and has a through hole 25 formed radially through the upper end of the outer cylinder 8.
It is removably inserted into the outer cylinder 8 from the inside side.

According to the embodiment configured as described above, the bodies 9 and 10 of the mold are made of cast iron material, so the bodies 9 and 10 can be manufactured at low cost.

Further, during centrifugal casting, the mold device 3 is driven to rotate, and molten metal is injected into the molds 9 and 10 to centrifugally cast the product 26. In this case,
The protrusion 19 at the upper end of the mold bodies 9, 10 is the outer cylinder 8.
The main bodies 9, 10 and the lower cover 15 are vertically spaced apart from the table 2, and there is a vertical gap between the main bodies 9, 10 and the lower cover 15 and the table 2. is formed, the downward thermal expansion of the main bodies 9, 10 is allowed, and no pushing up force due to the centrifugal force from the product 26 acts on the main bodies 9, 10, so that Large compressive stress, tensile stress, etc. are not generated in the main bodies 9, 10, and there is no risk that the main bodies 9, 10, which are made of cast iron, will be damaged.

Furthermore, the mold bodies 9 and 10 can be easily taken out from the inside of the outer cylinder 8 by attaching a hanging bolt to the hanging bolt threaded portion 24 formed on the upper end surface side.

Furthermore, as shown by the imaginary line in Fig. 2, Table 2
In addition, by arranging the bolt holes 27 for attaching the outer tubes 8 in a row in the radial direction, outer tubes 8 having different diameters can be attached to the table 2.

(Effects of the invention) According to the invention, large compressive stress or tensile stress is not generated in the main body of the mold during centrifugal casting work, so the main body can be made of inexpensive materials such as cast iron, and the outer cylinder can be made from inexpensive materials such as cast iron. By changing the inner diameter of the main body without replacing it, it is possible to adapt to various product diameters, and the main body can be manufactured at low cost. Furthermore, the stopper that prevents the upper cover from moving upward relative to the outer cylinder can be easily handled, and the mold can also be easily removed from the outer cylinder.

The present invention not only has the above-mentioned advantages, but also has a simple structure and is very useful.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a mold device showing an embodiment of the present invention, and FIG. 2 is a front view of the rigid centrifugal casting machine. 2...Rotary table, 3...Mold device, 8...Outer cylinder,
9, 10...Mold body, 11...Stopper, 13...
Placement surface stepped portion, 15...lower lid, 16...upper lid, 19...protruding portion, 22... protruding portion, (engaging portion).

Claims (1)

[Claims for Utility Model Registration] An outer cylinder into which a mold is removably inserted is provided on a rotary table of a vertical centrifugal casting machine, and the upper part of the inside of the outer cylinder is concentric with the table. On the other hand, the mold consists of a main body divided into upper and lower parts, and an upper cover and a lower cover that are detachably attached to the upper and lower parts of the main body, and the above-mentioned mounting surface is formed on the upper part of the mold main body. A protrusion that is removably placed on the surface step is provided radially outward, and in a state where the protrusion is placed on the placement surface step, the table and the mold are vertically aligned. A stopper is provided on the upper part of the outer cylinder which is spaced a predetermined distance apart and prevents upward movement of the mold relative to the outer cylinder, and an engaging part for centering with the table is formed in the lower cover. A mold device for a rigid centrifugal casting machine.