KR20210147756A - Centrifugal casting mold for manufacturing hybrid brake disc - Google Patents

Abstract

The present invention provides a centrifugal casting mold comprising: a lower mold transported through each process of a centrifugal casting process, combined above a mold base pivoting parallel to the ground while sharing a central axis with the mold base, having a multistage structure of the central region of an upper surface being higher than the edge region of the upper surface, and having a hanging bump formed along the circumference of the outer side surface of the upper end of the multistage structure; an upper mold having the inner circumference surface corresponding to a lower surface, having a casting space opened downward and having an injection hole formed in the central region of the upper surface to penetrate and communicating with the casting space to inject molten metal; and four more fixing members arranged and combined in the edge region of the lower surface of the upper mold by the predetermined angle unit around the central axis of the upper mold, and providing an elastic pressurizing force toward the center of the upper mold. According to the present invention, the defect of a centrifugal casting result can be minimized, regions of the upper mold and the lower mold being in direct contact with molten metal are arranged in a shape capable of being separated, thereby reducing costs for mold replacement caused by the deformation of the molds by a repeated centrifugal casting process or a change in the specifications of a floating seal.

Description

Centrifugal casting mold for manufacturing hybrid brake disc

The present invention relates to a mold for centrifugal casting for manufacturing a hybrid brake disc.

In the centrifugal casting device, since the mold rotates at a predetermined speed while the hot molten metal is in direct contact with the inside of the mold, when continuous centrifugal casting is performed, the mold is slightly deformed by thermal expansion due to heat and centrifugal force due to rotation. can be In particular, in the centrifugal casting device as in the prior art, since centrifugal casting is continuously and repeatedly performed to increase productivity, the frequency of occurrence of mold bias due to mold deformation and rotation is also high, so that the mold inside the mold changes, pins, etc. Due to the deformation of the fixed position between the upper and lower molds coupled by the fixing means of Due to this, defects may occur in the casting result (casting), and since the entire mold has to be replaced when a defect in the casting occurs, there is a problem in that the replacement of the mold is expensive.

As a related technology, Patent Registration No. 1017436270000 discloses a technology for fixing a mold with a clamping means, but does not contribute to the stability of the position of the mold during centrifugal casting.

An object of the present invention is to provide a mold for centrifugal casting that minimizes the occurrence of defects in the casting due to distortion of the upper and lower molds due to thermal expansion generated during the repeated centrifugal casting process.

Another object of the present invention is to provide a mold for centrifugal casting that prevents vibration and shaft deviation of the mold during centrifugal casting.

In addition, the present invention is to provide a mold for centrifugal casting that can reduce the cost of manufacturing and replacing the mold.

In the present invention, the upper part of the mold base that rotates in parallel with the ground with respect to the central axis during the centrifugal casting process is coupled to share the central axis with the mold base, and the central area of the upper surface has a higher height than the outer area of the upper surface. a lower type provided in a multi-stage structure, and having a locking jaw formed along the periphery of the upper outer surface of the multi-stage structure;

As an upper mold facing the lower mold, it has a casting space open downward while having an inner peripheral surface corresponding to the outer shape in the central region of the lower surface, and the central region of the upper surface communicates with the casting space and is formed through an injection hole through which the molten metal is injected avoirdupois; and

At least four fixing members are disposed and coupled to the outer region of the lower surface of the upper die at a predetermined angle unit with respect to the central axis of the upper die, and provide an elastic pressing force in the central direction of the upper die.

In the upper mold, the central region of the lower mold in which the casting space is formed is positioned so as to be in contact with the central region of the upper surface of the lower mold. It provides a mold for centrifugal casting, characterized in that.

The lower mold includes a lower plate in the shape of a disk that is coupled to share the central axis of rotation of the mold base and the central axis of the lower mold in an upper direction of the mold base; and

It is provided in the shape of a disk having a smaller radius than the lower plate, is seated and fixed in the central region of the upper surface of the lower plate, and includes an upper plate having a locking protrusion formed along the periphery of the outer surface;

The upper surface of the upper plate increases in height from the outer region toward the center, and provides a mold for centrifugal casting, characterized in that it has a truncated cone-shaped diffusion region having a diameter smaller than the width of the lower open region of the casting space of the upper mold. do.

The fixing member is coupled to the outer region of the lower surface of the upper die, and a passage is formed therein in a central direction of the upper die, and the inner diameter of one end of the passage adjacent to the center of the upper die is formed smaller than the inner diameter of other sections. And, the other end section of the passage provides a mold for centrifugal casting having a body provided in a shape in which a thread is formed along the inner circumferential surface.

When the central region of the lower surface of the upper mold is positioned in contact with the upper surface of the upper plate of the lower mold, the body of at least three or more fixing members arranged and coupled to the outer region of the lower surface of the upper mold in units of a defined angle with respect to the central axis of the upper mold It provides a mold for centrifugal casting, characterized in that exposed from the passage of the locking jaw formed on the upper plate and fixed, the upper mold is fixed in the vertical direction to the lower mold.

The emergency stopper provides a mold for centrifugal casting, characterized in that it is formed along the periphery of the side surface of the upper plate and is formed in a concave groove shape having a depth lower than the exposed height of the ball exposed from the body.

According to the present invention, there is provided a mold for centrifugal casting that minimizes the occurrence of defects in the casting due to the distortion of the upper and lower molds due to thermal expansion generated during the repeated centrifugal casting process.

In addition, the present invention provides a mold for centrifugal casting that prevents vibration of the mold from occurring and shaft deviation during centrifugal casting.

In addition, the present invention provides a mold for centrifugal casting that can reduce the cost of manufacturing and replacing the mold.

1 is a view of combining a centrifugal casting mold for manufacturing a hybrid brake disc.
2 is a shape diagram of a centrifugal casting upper mold for manufacturing a hybrid brake disc.
3 is a shape diagram of a centrifugal casting lower mold for manufacturing a hybrid brake disc.
4 is a view of the shape of a centrifugal casting inlet for manufacturing a hybrid brake disc.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a centrifugal casting mold coupling for manufacturing a hybrid brake disc, FIG. 2 is a shape diagram of a centrifugal casting upper mold for manufacturing a hybrid brake disc, and FIG. 3 is a view showing a shape of a centrifugal casting lower mold for manufacturing a hybrid brake disc.

1 shows a state in which the upper mold and the lower mold are coupled and the injection hole is coupled to the upper mold in cross-sectional and perspective views.

2 shows the upper mold in more detail, the upper mold has a casting space open downward while having an inner circumferential surface corresponding to the outer shape in the central region of the lower surface, and the central region of the upper surface communicates with the casting space and the molten metal This injection hole is formed through.

The injection hole coupled to the center of the upper die and the upper die are coupled with a fixing member, and the fixing members are also coupled to the outer side of the upper die at a predetermined angular interval than the central fixing member of the upper die. These fixing members reach the projected position to face the place where the locking jaw formed on the lower mold is, and serve to press the upper mold to fix the upper mold to the lower mold.

That is, the upper mold includes at least four fixing members arranged and coupled to the outer region of the lower surface of the upper mold in a predetermined angle unit with respect to the central axis of the upper mold and providing an elastic pressing force in the central direction of the upper mold, wherein the upper mold is the casting space While the central region of the formed lower surface is positioned to abut against the central region of the upper surface of the lower mold, at least three or more fixing members are caught by the locking jaws of the lower mold, and the upper mold is fixed to the upper part of the lower mold.

In addition, the alignment members installed in the radial direction are assembled to both the upper and lower molds, respectively, and serve to press toward the center, and at the same time make it possible to visually check whether the positions of the upper and lower molds are aligned with the naked eye.

On the other hand, in addition to the fixing member, the upper die is formed with a through hole (not shown) into which the extraction pin can be inserted. The through hole is an opening through hole leading to the casting space and plays a role in pushing the ejected product when the molded product is taken out from the mold.

3 shows the configuration of the lower mold.

The lower mold is a multi-stage, in which the upper part of the mold base rotates in parallel with the ground with respect to the central axis during the centrifugal casting process, sharing the central axis with the mold base, and coupled to each other, the central area of the upper surface having a higher height than the outer area of the upper surface formed into a structure.

That is, the lower mold is a disk-shaped lower plate coupled by sharing the central axis of rotation of the mold base and the central axis of the lower mold in the upper direction of the mold base; and a disk shape having a smaller radius than the lower plate, the lower plate and an upper plate that is seated and fixed in the central region of the upper surface of the .

The upper surface of the upper plate has a truncated cone-shaped diffusion region having a diameter smaller than the width of the lower open region of the casting space of the upper mold, but increasing in height from the outer region toward the center.

The fixing member and the alignment member, the inner diameter of one end of the passage adjacent to the center direction of the upper die is formed smaller than the inner diameter of the other section, and the other end section of the passage has a body provided in a shape in which a thread is formed along the inner circumferential surface. .

The locking protrusion is formed along the periphery of the side surface of the upper plate, and a concave groove shape having a depth lower than an exposure height of the ball exposed from the body is formed in association. Due to this locking jaw and groove structure, the coupling between the upper and lower molds can be stably fixed.

On the other hand, the locking jaw formed in the lower mold may be composed of a locking jaw having a groove in itself, and three or more fixing members reaching the groove formed in the locking jaw are provided in the upper mold, so that the fixing member is seated in the groove in the locking jaw During rotation for centrifugal injection, the upper and lower molds can be stably fixed by being caught on the sill.

That is, the fixing member descended from the upper mold is provided with a locking groove so that the position of the upper and lower mold can be stably fixed due to the locking phenomenon caused by the locking groove during the rotation process for centrifugal casting.

4 is a view showing the shape of a centrifugal casting inlet for manufacturing a hybrid brake disc.

The inlet is fixed to the upper die by a fixing member.

In this way, it is possible to implement a mold for centrifugal casting in which the position of the upper and lower molds can be stably fixed and aligned.

The right of the present invention is not limited to the above-described embodiments, but is defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. it is self-evident

Claims (5)

During the centrifugal casting process, on the upper part of the mold base that rotates parallel to the ground with respect to the central axis, the mold base and the central axis are shared and combined, and the central area of the upper surface has a higher height than the outer area of the upper surface. Ha Hyung; and
An upper mold facing the lower mold, having a casting space open downward in a central region of the lower surface, and an upper mold in which an injection hole is formed in communication with the casting space to inject molten metal in the central region of the upper surface;
The upper mold includes a plurality of fixing members for stably fixing the positions of the upper and lower molds during the centrifugal casting process, the fixing member provides an elastic pressing force, and the lower mold includes a locking groove through which the fixing member can be caught. A mold for centrifugal casting, characterized in that. According to claim 1,
The lower mold includes a lower plate in the shape of a disk that is coupled to share the central axis of rotation of the mold base and the central axis of the lower mold in an upper direction of the mold base; and
It is provided in the shape of a disk having a smaller radius than the lower plate, is seated and fixed in the central region of the upper surface of the lower plate, and an upper plate having a locking protrusion formed along the periphery of the outer surface; includes;
The upper surface of the upper plate increases in height from the outer region toward the center, and has a truncated cone-shaped diffusion region having a diameter smaller than the width of the lower open region of the casting space of the upper mold. According to claim 1,
The upper and lower molds each include an alignment member coupled from the outer side toward the center, wherein the alignment member is configured to confirm whether the upper and lower molds are aligned. The mold for centrifugal casting according to claim 1, wherein the upper die includes a through hole through which a take-out pin for pressing the taken-out material can pass through when the taken-out material is taken out. 4. The method of claim 3,
The locking groove is formed along the periphery of the side of the upper plate, and is formed in the shape of a concave groove on the protruding locking jaw.

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