JPS6130767Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a centrifugal casting mold.
A centrifugal casting mold is a centrifugal casting mold in which split molds are divided on a plane perpendicular to the axis and joined together with bolts, etc., and a gap is pre-existing in the joining part of the split molds, or a temperature The present invention relates to a centrifugal casting mold that does not cause misalignment at all between the divided molds even if a gap occurs due to the difference, and allows stable operation without vibration.

When producing cylindrical castings or circular cross-section solid castings, such as large rolls, by centrifugal casting,
The mold is constructed as a divided mold into several parts perpendicular to the axial direction from the viewpoint of manufacturing the mold or the shape of the product.
Centrifugal casting is performed using this split mold.

For example, FIG. 1 is a vertical cross-sectional view of one example of a conventional split mold for centrifugal casting, and this mold consists of three split molds 1, 2, and 3, each of which has a are connected with their end faces as mating surfaces 9, and are integrally connected by tightening bolts 7. The top cover 4 and the bottom cover 5 are attached by being locked with a fastening fitting 6, and the mold having this structure is placed on receiving rollers 10 and 11, and is rotated at high speed around an axis by these rollers 10 and 11.
The injected bath water 12 is biased toward the inner surface of the mold by centrifugal force, and a cylindrical product is cast. In this centrifugal casting mold, in consideration of thermal expansion and deformation during casting, workability during assembly and disassembly, etc., the fitting portion of the mating surface 9 of each split mold is usually 2 to 3 mm in advance. It is necessary to provide a gap of However, the balance of each divided mold is lost and vibration occurs, which often leads to major accidents.

In order to prevent this misalignment, it is conceivable to reduce the gap between the tightening bolt and the bolt hole, but if this is done, the bolt will shear and break due to the difference in expansion of the split molds. In addition, if the gap between the mating surfaces of the split molds is too small, it will be difficult to assemble and disassemble the split molds, and due to the difference in thermal expansion, the gap will disappear, making it difficult to fit between the split molds. There was a risk that the mold would be damaged due to heavy loads. Furthermore, even if there was no damage, vibrations made quality unstable and work often had to be interrupted for safety reasons.

The purpose of the present invention is to solve the above-mentioned problems. Specifically, it is possible to completely prevent misalignment, prevent excessive loads from being applied to the split molds, and enable stable operation without vibration. We propose a centrifugal casting mold that can produce defect-free castings.

That is, the present invention is characterized in that a guide key is interposed radially in the radial direction between the mating surfaces of split molds that are divided along a plane perpendicular to the axis, and the guide keys are integrally connected by tightening bolts. do.

Hereinafter, embodiments of the embodiments will be described with reference to the drawings.

In addition, FIG. 2 is a longitudinal cross-sectional view of a mold according to one embodiment of the present invention, and FIGS. 3 and 4 are cross-sectional views taken along arrows A-A and B-B in FIG. 2, respectively. It is a diagram.

First, as shown in Fig. 2, the mold is divided into a plurality of parts, for example, three parts, on a plane perpendicular to the axis, and each divided mold 1, 2, and 3 is the same as the conventional example shown in Fig. 1. Then, they are joined together by tightening bolts 7 and assembled by fitting the fitting portions formed on the mating surfaces 9 of each split mold, and the top cover 4 and bottom cover 5 are also assembled as shown in FIG. Similar to the vertical example shown in
It is locked by. Further, a roller receiving part 8 is formed on the outer periphery of the mold, and the mold is placed on receiving rollers 10 and 11 via these roller receiving parts 8 and rotated at high speed, and the molten metal 12 is moved into a cylindrical shape by centrifugal force. It is cast into a shaped object.

Therefore, as mentioned above, in a centrifugal casting mold that is assembled by combining the split molds 1, 2, and 3, the mating surface 9 of each split mold is tightened into the bolt hole 15 as shown in FIG. 3, as in the conventional example. At the same time, a guide key 14 is interposed between the mating surfaces 9 to guide the movement of the plane perpendicular to the axis between the adjacent split molds 1 and 2 and the split molds 1 and 3. It is restrained and restricted by the key 14.

The guide keys 14 are arranged concentrically between the respective split molds, and are interposed radially in the radial direction as shown in FIG. To explain in more detail, guide grooves 13 are formed radially in the mating surface 9 of each split mold, as shown in FIGS. 3 and 4, and guide keys are inserted into these guide grooves 13. 14 to intervene. At this time, between the guide key 14 and the guide groove 13, taking into account the distortion caused by long-term use of the mold,
It is necessary to leave a certain amount of space, but
For example, in a split mold with an inner diameter of about 1000 mm, the maximum
0.25mm is sufficient.

In addition, in the present invention, the split molds do not have to be constructed as shown in the example shown in FIG. 2, but can be constructed in any manner. For example, as in the example shown in FIG. 3, it can be formed in the central split mold 1, and the shape of the guide key 14 can be either cylindrical or polygonal if the movement of each split mold is restricted.

As described above, the present invention has a guide key interposed on the mating surface of each split mold, and the guide key is restrained from moving in the plane direction perpendicular to the axis of each split mold. , each split mold is integrated,
Stable centrifugal casting is possible without shifting the axis.

That is, since the guide key 14 is interposed between the mating surfaces, the axes of the divided molds are automatically aligned when they are combined, so that work efficiency is greatly improved. In addition, even if there is a difference in thermal expansion between the divided molds after pouring the molten metal, relative movement is performed using the guide key as a guide, which eliminates misalignment during rotation and reduces vibration.
There is no abnormal wear on the receiving roller or the roller receiving part of the mold, and there is no need to worry about deformation or damage to the tightening bolts, allowing stable operation. As a result, maintenance costs for receiving rollers, molds, etc. are greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an example of a conventional centrifugal mold, FIG. 2 is a vertical cross-sectional view of a mold according to an embodiment of the present invention, and FIGS. FIG. 2 is a cross-sectional view taken along the line A-A and the line B-B in the figure. Codes 1, 2, 3...Each split mold, 4...Top lid,
5...Bottom lid, 6...Tightening metal fittings, 7...Tightening bolts, 8...Roller receivers, 9...Matching surfaces of each split mold, 10, 11...Receiving rollers, 12... Molten metal, 13... Guide groove, 14... Guide key.

Claims (1)

[Scope of utility model registration request] In a centrifugal casting mold in which split molds are divided on a plane perpendicular to the axis and joined together by tightening bolts, etc., a guide key is placed radially in the radial direction between the mating surfaces of each split mold. A centrifugal casting mold characterized by being formed by intervening and joining.