JP4532527B2 - Cast composite - Google Patents

Description

  The present invention relates to a cast composite material in which a wear-resistant material is welded to a predetermined part on the surface of a base material by casting.

Cast walnuts, known as one of the methods for reforming the casting surface, are made by setting a member previously formed of a reforming alloy in a mold and casting a molten metal as a base material in the mold. Has been conventionally performed to improve the wear resistance of a predetermined part of a casting (see Patent Document 1).
JP-A-6-190537 (paragraph 0005)

  As an example of a cast composite material manufactured by the above-described casting method, there is a material charging chute liner in which a wear-resistant material is welded to the surface receiving the raw material.

  By the way, when casting a liner as described above, usually, a granular material layer is formed by arranging granular materials formed of wear-resistant material on a predetermined surface in a mold, and from several locations on the outer peripheral side of the predetermined surface. Since the molten metal is poured, the molten metal temperature is lowered at the central portion of the liner, and the weld strength of the granular material tends to be lowered. For this reason, in such a cast composite liner, a part of the wear-resistant material may be peeled off during use, and the wear of the base material may proceed from that position, so that the life may be significantly shortened.

  An object of the present invention is to provide a cast composite material in which the wear-resistant material welded to the base material surface is difficult to peel off.

  In order to solve the above-described problems, the present invention provides a cast composite material in which a wear-resistant material is welded to a predetermined portion of a base material surface by casting, and is formed of the wear-resistant material at a predetermined portion of the base material surface. The granular body is arranged so as to cover the base material, and the granular body layer is formed, and the columnar body formed of the wear-resistant material is embedded from the granular body layer to the base material at a predetermined interval. Adopted.

  That is, by welding the granular material layer of the wear-resistant material covering the base material and a large number of wear-resistant material columnar bodies to a predetermined part of the base material surface in a state where the columnar bodies are embedded from the granular material layer into the base material. Compared with the case where only the granular material layer is welded, the welding area of the wear resistant material and the base material is increased by the amount of the portion embedded in the base material of the columnar body, thereby increasing the welding strength of the wear resistant material.

  In the above configuration, by causing the granular bodies to be arranged around the respective columnar bodies, it is possible to prevent wear from proceeding from the surroundings of the respective columnar bodies.

  High chromium cast iron can be used as the material of the base material, and a cemented carbide containing tungsten carbide as a main component can be used as the wear resistant material.

  As described above, the cast composite material of the present invention includes a wear resistant material granular layer covering the base material and a number of wear resistant material columnar bodies at predetermined locations on the surface of the base material. Since it is welded while being embedded in the base material, the wear resistance of the wear resistant material is high, and the wear resistant material is difficult to peel off. Therefore, it can be used stably for a long period of time without causing early wear from the peeled portion of the wear-resistant material as in the prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The cast composite material of this embodiment is a liner attached to a raw material charging chute (not shown). As shown in FIGS. 1A and 1B, a thick plate-shaped mother made of high chromium cast iron is used. A cemented carbide mainly composed of tungsten carbide is welded to one surface of the material 1 as a wear-resistant material by casting.

  On one surface of the base material 1, the granulates 2 having a diameter of 8 mm formed of the cemented carbide are arranged so as to cover the base material 1, whereby the granular material layer 3 is formed. In addition, a large number of columnar bodies 4 having the same material as the granular body 2 and having a diameter of 10 mm are embedded in the base material 1 through the granular body layer 3 in the central portion. Here, the embedding positions of the respective columnar bodies 4 are aligned along the longitudinal direction of the liner, aligned along a straight line that forms 60 ° with the longitudinal direction of the liner, and the distances d between the columnar bodies 4 are all 7 mm. Is arranged. Thereby, as shown in FIG. 2, the granular bodies 2 are arranged closely around each columnar body 4. And these granular material 2 and the columnar body 4 are welded to the preform | base_material 1 with the cast hole so that it may mention later.

  In addition, the arrangement | sequence of the said columnar body 4 is not restricted to what was shown in FIG.1 and FIG.2, A various pattern is employable. The diameter of the columnar body 4 can be changed within a range of 5 to 15 mm. If it is less than 5 mm, the columnar body 4 may break due to the impact of the raw material falling on the cemented carbide welding surface, and if it exceeds 15 mm, the columnar body 4 may break due to the thermal shock of the molten metal during casting. Because. On the other hand, the diameter of the granular body 2 may be set to a size arranged around each columnar body 4 according to the arrangement of the columnar bodies 4, but if it is too small, the granular body layer 3 becomes thin and wear-resistant. Since this is disadvantageous, it is desirable that the thickness be about 4 to 12 mm.

  When casting this liner by the cast-in method, first, a columnar body 4 longer than the state shown in FIG. 1 is prepared, and a part of the columnar body 4 is embedded in a predetermined surface in a mold not shown. . Then, by arranging the granular body 2 in a portion other than the position where the columnar body 4 is embedded in the predetermined surface, the columnar body 4 is set to protrude from the granular layer 3 into the space in the mold, Pour high chromium cast iron melt from several locations on the outer circumference.

  At this time, since the temperature of the molten metal poured into the mold decreases as it approaches the center portion of the liner, the welding strength of the granular material 2 tends to be low at the center portion of the liner. However, since the columnar body 4 is embedded in the base material 1 in the central portion of the liner, the cemented carbide and the base material 1 are equivalent to the embedded portion of the columnar body 4 than when only the granular layer 3 is welded. As a result, the welding area of the cemented carbide increases. Then, while removing a casting_mold | template and cutting and removing the part embedded in the casting_mold | template of the columnar body 4, the product state shown in FIG. 1 is obtained.

  As described above, in this liner, the cemented carbide granular material layer 3 covering the base material 1 and a number of cemented carbide columnar bodies 4 are arranged at the center of one surface of the base material 1. By welding while being embedded in the base material 1 from the granular material layer 3, the low welding strength of the granular material 2 in the central portion is compensated by the size of the welded area of the columnar body 4, and the welding strength of the cemented carbide. As a result, the cemented carbide is hardly peeled off. In addition, since the granular bodies 2 are densely arranged around each columnar body 4, wear does not proceed from the periphery of the columnar bodies 4. Furthermore, since the columnar body 4 also plays a role of preventing the flow of the granular body 2 due to pouring during casting, a cemented carbide welded surface free of the granular body 2 is formed. It has become an excellent one.

  The present invention is not limited to the raw material charging chute liner as in the embodiment, and can be widely applied to various cast composite materials in which a wear-resistant material is welded to the base material surface by casting.

a is a plan view of the liner (casting composite material) of the embodiment, b is a longitudinal sectional view of a Enlarged sectional view taken along line II-II in FIG.

Explanation of symbols

1 Base Material 2 Granule 3 Granule Layer 4 Columnar

Claims (2)

In a cast composite material in which a wear-resistant material is welded to a predetermined part of the base material surface by casting, the granular material formed of the wear-resistant material is arranged on the predetermined part of the base material surface so as to cover the base material. A granular layer is formed, and the columnar body formed with the wear-resistant material longer than the diameter of the granular body penetrates the central portion of the granular layer at a predetermined interval and is embedded in the base material. Cast composite material characterized by   The cast composite material according to claim 1, wherein the granular materials are arranged around each columnar body.

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