JPH0327716Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a mold stand for centrifugal casting, and particularly to self-alignment of a mold in the mold stand.

[Conventional technology]

As a conventional centrifugal casting mold table, for example, the seventh
There is something like the one shown in the figure. (Published July 1, 1982, "Mechanical Engineering Complete Book" Volume 20, Non-Cutting Methods, Vol.
68 pages, Kenji Chijiiwa, Coronasha Co., Ltd.).

This is a mold stand for vertical centrifugal casting, 1 is a rotating device, 2 is a rotating shaft, 3 is a rotary mold stand fixed to this rotating shaft, 4 is a mold placed on this mold stand, and 5 is a The sprue 6 is the product cavity. In addition, 7 is a hot water pool, and 8 is a crucible for casting.

Molding is performed by rotating a mold stand 3 around a rotating shaft 2, pouring molten metal into a cavity 6 from a sprue 5 provided at the center of rotation, and pressing the molten metal outward by centrifugal force.

[Problem that the invention attempts to solve]

However, in such a conventional centrifugal casting mold table, a gap C is provided between the inner diameter of the rotary mold table 3 and the outer diameter of the mold 4 in order to absorb variations in the outside dimensions of the mold. However, there was no mechanism for aligning the center of the mold with the center of rotation, so even if the center was slightly misaligned, the centrifugal force would push the mold against one side of the mold table and cause it to become eccentric, resulting in molten metal scattering and mold damage. There was a problem that the mold table was damaged or the rotating shaft was damaged.

This invention was made in view of these conventional problems, and aims to solve the above problems by providing a mold table for centrifugal casting equipped with a self-aligning mechanism.

[Means for solving problems]

This invention achieves the above object by providing a self-aligning mechanism equipped with spring members that press the outer periphery of the mold toward the center of rotation at at least three locations on the inner periphery of the mold table having a rotating shaft. This is a mold stand for centrifugal casting that is characterized by:

[Effect]

The self-aligning mechanism in this invention presses the mold placed in the rotating mold table toward the center of rotation of the mold table, and automatically aligns itself while rotating, sufficiently countering eccentric centrifugal force. and suppress eccentricity.

〔Example〕

This invention will be explained below based on the drawings. 1 to 4 are diagrams showing an embodiment of this invention. In addition, the same reference numerals are attached to the same or equivalent parts as in the conventional art.

First, to explain the structure, numeral 10 is a self-aligning mechanism provided on the rotary mold stand 3, and includes a spring member 11 for mold alignment that presses the outer periphery of the mold supporter 4a constituting the mold 4 toward the center of rotation. Equipped with

In this embodiment, a leaf spring bent into a hook shape as shown in FIG. It can be easily installed by simply setting the screw 12 through the screw hole 12a. The spring force of the leaf spring 11 is set to be large enough to withstand the centrifugal force calculated from the weight of the mold 4 placed in the mold stand 3 and the estimated eccentricity. Further, the arrangement of the leaf spring 11 is similar to that of the rotary mold table 3.
It is necessary to distribute the circumference of the leaf springs 11 into at least three equal parts, and this embodiment shows a case where six leaf springs 11 are arranged in a distributed manner.

Next, the effect will be explained.

When the mold 4 is installed in the centrifugal casting mold stand 3 equipped with the self-aligning mechanism 10 as described above, it is guided by the inclined surface 11a of the spring member 11 and slides smoothly, and the center of the mold 4 is aligned with the mold. It automatically matches the center of rotation of table 3. Therefore, there is no need to correct the eccentricity of both after installation. This also applies, for example, when the mold 4 is mounted using an automatic mounting means such as a robot. Even if the mold 4 is misaligned, the mold 4 will be self-aligned when the grip is opened, making it extremely easy to automate the installation process. Since the centering force of the spring member 11 continues to act on the mold 4 even while the mold table 3 with the mold 4 attached thereto is rotating, a biased centrifugal force is generated due to eccentricity as in the conventional case, and the molten metal in the mold may be scattered. , the phenomenon of damage to the mold or mold stand can be completely prevented.

5 and 6 show other embodiments.

In this embodiment, the plate spring 11 as the spring member of the first embodiment is replaced by a coil spring 21 with a mold slide guide 20, and the self-aligning action is the same. That is, the mold slide guide plate 20 has an inclined surface 20a for guiding the mold 4, and is formed of an elastic plate with a relatively small spring force that can swing in the direction of arrow A. 3 is fixed to the upper edge 3a of the mold table with bolts 22, or a mold plate made of an inelastic plate is attached to the upper edge 3a of the mold table so as to be swingable in the same manner and loosely bolted.

On the other hand, the coil spring 21 is interposed between the mold slide guide 20 and the raised side wall of the mold table 3, and always elastically urges the mold slide guide 20 toward the rotation center of the mold table 3. ing. 23
is a bolt for fixing a coil spring, which has a hemispherical pressing head 24 and a spring seat 25 at one end, and the other end is inserted into a through hole 26 provided in the side wall of the mold table 3 and secured with a nut 27. has been done.

The strength of the spring force and the arrangement of the coil spring 21 may be considered in the same manner as in the above embodiment.

According to each embodiment, since the eccentricity of the mold is automatically aligned, it is possible to prevent the scattering of molten metal and damage to the mold due to centrifugal force, as well as the fluctuating load due to the eccentricity applied to the rotating shaft of the mold table. This will greatly extend the life of the rotating equipment.

[Effect of idea]

As explained above, according to this idea,
The rotary mold table for centrifugal casting is equipped with a self-aligning mechanism on the inner periphery that uses spring force to press the mold to the center of rotation, so the mold can be automatically mounted at the center of rotation, allowing centrifugal casting. This has the effect of preventing scattering of molten metal and damage to the mold, mold stand, etc. due to force.

[Brief explanation of drawings]

Fig. 1 is an overall side sectional view of an embodiment of this invention, Fig. 2 is a plan view, and Fig. 3 is an enlarged side view of main parts.
FIG. 4 is an enlarged rear view of the main part, FIG. 5 is a side sectional view of another embodiment, FIG. 6 is an enlarged side sectional view of the main part, and FIG.
The figure is an overall side sectional view showing an example of a conventional centrifugal casting mold table. 2...Rotating shaft, 3...Mold stand, 4...Mold, 1
0... Self-aligning mechanism, 11, 21... Spring member.

Claims (1)

[Scope of utility model registration request] At least 3 on the inner peripheral side of the mold table having a rotating shaft
1. A mold stand for centrifugal casting, characterized in that a self-aligning mechanism is provided at several locations with a spring member that presses the outer periphery of the mold toward the center of rotation.