JPS6032921Y2 - flat split mold - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flat-sided mold used for manufacturing an ingot having a rectangular cross section.

Conventionally, in order to manufacture metal or alloy plates, strips, etc., molten metal is poured into a mold to create an ingot, which is used as a raw material.

Particularly in the case of relatively small-volume production of non-ferrous metals or alloys, a small flat ingot with a unit weight of less than 9 in 100 and a rectangular cross section is cast and directly heated without going through blooming or forging. It is often subjected to inter-rolling or cold rolling.

As a mold for casting the small ingot, it is preferable to use a split mold 1 having a rectangular cross-section divided in the long axis direction as shown in FIG. 1, as it is lightweight and convenient for cleaning the mold's inner surface. and is commonly used.

For example, the lower part of the split mold 1 is fitted onto a surface plate (not shown), and a feeder frame (not shown) is attached to the upper part, and molten metal is poured into the mold to produce a flat ingot 2 as shown in FIG. However, as shown in Fig. 3, the abutting parts of the split mold 1 are normally provided so that the male and female mating parts come into close contact when the mold is newly manufactured, so as the split mold 1 is repeatedly used, it may heat up. If the deformation occurs and is exaggerated, as shown in Figure 4, the inside of the abutment part of the split mold opens and a wedge-shaped gap 3 is created, and the molten metal that has entered this gap 3 is ingot 2 as shown in Figure 2 above. As shown in the figure, a fin-shaped so-called casting 4 is formed.

This casting 4 interferes with the subsequent processing of the ingot 2, so it must be removed.In addition to the disadvantage that it takes time and effort, the casting 4 gets wedged into the abutting part of the split mold 1 during casting. Because of this, the shrinkage tendency of the unsolidified portion of the ingot 2 is also restrained and tensile stress is generated when the unsolidified portion of the ingot 2 is solidified, resulting in partial cracks and an essential defect that a sound ingot cannot be obtained. There were drawbacks such as.

The present invention solves the above-mentioned drawbacks of conventional split molds and provides a flat-sided mold with an improved shape of the abutting part so that no gap is created inside the abutting part even if thermal deformation occurs. An explanation will be given based on drawings showing examples.

Fig. 5 is a cross-sectional view of the flat side mold of the present invention, and Fig. 6 is an enlarged sectional view of the section (■) in Fig. 5, in which two mold pieces 6 and 7 each having a groove-shaped cross section are brought into contact with each other with their opening side end surfaces. In the flat side mold 5 which forms a rectangular closed cross section with the straight line connecting the abutting surfaces being the long axis direction, a mold is attached to the abutting portion of the opening side end surface of the one mold piece 7. A stepped recess 8 consisting of an inner bottom surface 9, an inclined surface 10, and an outer flat surface 11 is provided in order from the inside, and an inner text surface 13 and the above-mentioned inclined surface are provided in the abutting portion of the opening side end surface of the other mold piece 6 in order from the inside of the mold. 10 is provided, and when both mold pieces 6 and 7 are abutted, the inner bottom surface 9 of the stepped recess 8 and the stepped protrusion 1
2, there is a wedge-shaped gap 1 that spreads outward at an angle of about 5° from the inside of the mold as a starting point.
In the embodiment described above, the inner text surface 13 is provided parallel to the longitudinal line, but the invention is not limited to this. For example, the inner bottom surface 9 may be provided parallel to the longitudinal line. good.

Note that each corner of the stepped recess 8 and the stepped protrusion 12 is rounded to ensure that the fitting parts smoothly slide against each other and are not constrained when the split molds 6 and 7 are deformed due to expansion and contraction. It is provided for.

Since the present invention is constructed as described above, even if the split mold 5 is thermally deformed due to repeated use, the split mold abutting portion shown in FIG. The angle of the wedge-shaped gap 16 is narrowed and the angle is narrowed so that the wedge-shaped gap 16 is almost in close contact with each other, or a slight gap remains, so that the molten metal does not enter, thereby preventing the occurrence of casting and producing a high-quality ingot. can be manufactured efficiently and the service life of split molds can be greatly extended. For example, in an example of an ingot mold with a unit weight of about 9 in 100, the service life of conventional molds was about 10 to 1 century. However, the mold of the present invention is extremely effective and can be used 40 to 45 times.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional flat-side mold, Fig. 2 is a perspective view of an ingot manufactured using the conventional flat-side mold, and Fig. 3 shows the collision of the conventional flat-side mold when newly manufactured. FIG. 4 is a cross-sectional view showing the abutting portion during thermal deformation, FIG. 5 is a cross-sectional view of a flat side mold showing an embodiment of the present invention, and FIG. Enlarged sectional view at part ■,
FIG. 7 is an enlarged sectional view showing the thermal deformation state in FIG. 6. 1...Split mold, 2...Ingot, 3
...Gap, 4...Casting, 5...
...Split mold, 6,7... Mold piece, 8...
...Stepped recess, 9...Inner bottom surface, 10...
... Inclined surface, 11 ... Outer plane, 12 ...
...Stepped convex section, 13...Inner text, 14...
... Inclined surface, 15 ... Outer plane, 16 ...
...Wedge-shaped gap.

Claims (1)

[Scope of utility model registration request] A flat side formed by making two mold pieces 6 and 7 with groove-shaped cross sections abut each other with their opening side end surfaces to form a rectangular closed cross section whose major axis is the straight line connecting the abutting surfaces. In the mold 5, a stepped recess 8 having an inner bottom surface 9 and an inclined surface 10 is provided at the opening side end face abutting part of the one mold piece 7, and an inner text surface 13 is provided at the opening side end face abutting part of the other mold piece 6. A stepped convex portion 12 having an inclined surface 14 corresponding to the inclined surface 10 is provided, and when both the mold pieces 6 and 7 are abutted, the inner bottom surface 9 of the stepped recessed portion 8 and the stepped convex portion 12 and an inner surface 13 of the flat side mold, a wedge-shaped gap 16 is formed between the inner surface 13 of the mold and the wedge-shaped gap 16 that spreads outward from the inside of the mold.