JPS5818992Y2 - Sleeve for heat retention of feeder used in sand molds - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a riser heat-insulating sleeve that is used by being vertically divided at the mating surface of a sand mold.

Recently, when casting castings, especially ductile iron and steel castings, in order to increase the feeder effect and improve the feeder yield, an insulating type or heat-generating type heat-retaining sleeve is used in the casting method. There are many things.

This sleeve is made according to the casting plan (riseer shape) of the casting.
For example, as shown in Figs. 1 to 4, a circular cross section 1a, an elliptical cross section 1b, an open type 10 with various cross-sectional shapes, or a dome type 1d for blind feeders, etc. , their shapes and sizes vary.

Therefore, when making a sand mold using this thermal sleeve, if the sleeve, that is, the feeder part is not located on the mold mating surface of the mold, it will not be placed on the model flatly as in normal molding work. If this is done by setting the sleeve, there will be no separate installation problem, but when the sleeve 1, that is, the riser part 4 is located on the mold matching surface 6 of the mold 5, as shown in FIGS. It becomes a problem.

In this case, it is not possible to print the sleeve as it is, so
Conventionally, the manufacturing method was to remove the sleeve and mold the mold, then fit the sleeve into the feeder again, or
Alternatively, a method has been adopted in which split sleeves are vertically divided in advance according to the mating surface of the mold, and the sleeves are molded separately together with the mold, and the molds are matched.

However, with the former method, the size of the feeder after molding and the sleeve to be fitted into it often do not match, which not only requires cumbersome manual post-processing in the molding process, but also makes it difficult to create the desired shape in that part. There is a problem in that it is difficult to ensure the proper condition, which can lead to troubles in terms of casting quality.

Therefore, it is more preferable to use a split sleeve, but according to the latter method, the integral sleeve manufactured in a predetermined shape must be cut at the split position during mold molding before use.

In this case, the sleeve is usually cut using a saw blade or a cutter, but it is still a manual process that requires skill, so it cannot be done easily and efficiently, and the precision of the division is not necessarily accurate. There is a difficult problem.

Therefore, in order to solve this problem, the present invention has been developed by providing slits in advance at the positions of the riser heat-insulating sleeve, which is divided vertically according to the mold matching surface, to simplify the dividing process and improve the dividing accuracy. It was designed to measure improvement.

FIGS. 7 to 10 show embodiments of the present invention corresponding to those shown in FIGS. It is a part.

This slit 2 may be formed by cutting from the outer surface of the sleeve as shown in FIGS. 7 and 8, or may be formed by cutting from the outer surface of the sleeve as shown in
It may be formed by cutting from the inner surface of the sleeve as shown in FIG.

On the other hand, the connecting portions 3 that have not yet been cut through the slits 2 of each sleeve la, lb can be easily cut when used, and are maintained in a predetermined integral shape without being easily broken by handling when stored before use. From this point of view, it is preferable to leave the connecting portion 3 with a thickness of 1 to 2 mm.

11 and 12 illustrate this connecting portion 3. FIG. 11 shows a case in which a continuous connecting portion 3a is provided on one side of the sleeve 1, and FIG. 12 shows an example in which a continuous connecting portion 3a is provided on one side of the sleeve 1. This is a case where a connecting portion 3b is provided.

The manner in which the connecting portion 3 remains at the sleeve dividing position can be freely changed as long as it meets the above viewpoint.

When the sleeve is divided vertically and used, it is customary to mold it by dividing it into two halves, as shown in the illustrated example, but depending on the division state of the mold, this must be divided into two halves. There is no difference when it has to be divided into multiple parts, and slits can be provided at the dividing positions.

As described above, in the riser heat-insulating sleeve according to the present invention, slits are provided in advance according to the dividing positions, but forming the slits does not require any special process such as cutting.

In other words, when manufacturing this type of sleeve, it is customary to use a mold that corresponds to the shape of the sleeve and perform integral molding, but if this mold is provided with protrusions that correspond to the slits, it will be easier to mold the sleeve. At the same time, one with a predetermined slit formed therein can be manufactured without difficulty.

As described above, slits were provided at the dividing positions,
By using the feeder heat-insulating sleeve of the present invention, when making sand molds that require this type of split sleeve, the splitting work can be done easily and accurately, improving work efficiency and accurately forming the feeder part. It can be molded, and the problem of casting quality caused by mismatching the sizes of the sleeve and feeder part, which was the case in the past, is solved.

In addition, as another means of obtaining a divided sleeve, it is possible to mold the sleeve separately according to its shape from the time of manufacture, but in this case, there is a disadvantage that the number of manufacturing steps increases, and the sleeve is of low strength. However, if the sleeve is molded separately, it cannot prevent deformation and cannot maintain accurate shape and dimensions until use, so there is nothing better than using the sleeve of the present invention.

In other words, the riser heat-insulating sleeve of the present invention is restrained as a single piece until it is divided for use. Another major feature is that it does not cause problems such as deformation.

[Brief explanation of the drawing]

1 to 4 show examples of the shape of the riser heat retaining sleeve, FIGS. 1 and 2 are cross-sectional views, and FIGS. 3 and 4 are longitudinal cross-sectional views. 5 and 6 show examples of molds using split sleeves, with FIG. 5 being a longitudinal sectional view and FIG. 6 being a plan view. 7 to 10 are cross-sectional views showing an embodiment of the present invention, and FIGS. 11 and 12 are longitudinal cross-sectional views at the slit position. 1...Sleeve, 2...Slit, 3
...Connecting part, 4...Riser part, 5...
... Mold, 6... Mold mating surface.

Claims (1)

[Scope of Claim for Utility Model Registration] A riser heat insulating sleeve that is used by being vertically divided at the mold matching surface during the production of sand molds, which is formed by providing slits in the sleeve in advance at the dividing positions. A riser heat insulating sleeve used in sand molds. .