JPS5861959A - Bearing backing metal - Google Patents

Abstract

PURPOSE:To provide a bearing backing metal which is provided with the advantages of both materials of cast iron and steel materials by casting and melt- sticking a steel plate on the surface to be lined with molten cast iron. CONSTITUTION:After the otuside circumferential surface of a steel plate 2 formed to a required shape is applied with tin hot dipping 3, said plate is fixed via a steel bar 5 on a bottom part 4. The surface of the plate 2 is heated to 300-400 deg.C with a burner and a top part 6 is put thereon, whereby a mold is assembled. Molten metal is charged from the bottom part of the mold so as to be filled on both sides of the plate 2. In the stage of solidifying after the charging, the surface of the plate 2 melts and after the solidification of the molten iron, both are firmly and metallically bound. The cast backing metal is subjected to a heat treatment of stress relief annealing for about 3hr at about 500 deg.C; thereafter the cast iron lyaer inserted in the inside circumferential surface is machined away, whereby the bearing backing metal wherein the white metal lining surface of the backing metal is formed of the steel materials is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cast iron bearing base metal having a structure in which a bearing surface is lined with a bearing alloy such as white metal.

White metal bearings, which have a cast iron or steel base metal lined with white metal, are often used as high-speed, high-load bearings. In the case of a cast iron base metal, it has the advantage of having a higher damping capacity compared to a steel base metal, but on the other hand, the presence of graphite in the structure inhibits adhesion to the white metal, resulting in poor adhesion strength. . As a solution to this problem, methods such as electrochemically removing graphite from the surface of cast iron, or repeating plating several times before lining have been used, but in either method, the steel base metal The reality is that we cannot expect good adhesion.

Recently, in addition to the conventional pouring method and centrifugal casting method, welding overlay has also been put into practical use as a lining method, but even with this method, the adhesion of cast iron base metals is poorer than that of steel materials due to the release of gas due to continuous heat input. In recent years, there has been a trend towards higher speeds and larger capacities, especially in heavy electrical equipment such as generators and motors, and the bearings used in these equipment are required to be even more reliable. , has the advantages of cast iron base metal,
Moreover, an alloy material that has excellent adhesion to white metal has not yet been announced.

The present invention has been made in view of the above, and its purpose is to provide a bearing base metal that combines the advantages of both cast iron and steel by casting steel on the surface lining the bearing metal. be.

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a cast iron base metal, 2 is a steel plate with a thickness of 1 to 3 cm cast between the white metal lining, and the cast iron base metal 1 and steel plate 2 are welded together during casting.) Metallic bonded.

Next, the manufacturing procedure of the above structure will be explained. FIG. 2 is a longitudinal sectional view of a hook part of a steel plate casting part showing an embodiment of the manufacturing method. First, the surface of a predetermined shape (: preformed steel @2) is shot blasted, and then the outer peripheral surface is plated with hot-dip tin (3).
After that, it is fixed on the lower part 4, but in order to avoid welding at the contact part and to prevent deformation of the steel plate 2, it is fixed on the end face and center of the steel plate 2 as shown in Fig. 3C2. steel rod 5
is attached, and the steel plate 2 is fixed to the lower die 4 through this rod 5. The thickness of the steel plate 2 to be used is the thickness of the alloy (although it is different, if the base metal thickness of the casting part is 100 days, approximately 4-thickness is appropriate. After heating the surface of the steel plate 2 at 300 to 400°C (with a -ner), cover it with the upper mold 6 and assemble the @ mold.In addition, the end surface of the steel plate 2 in the axial direction is also completely sealed. Therefore, a cavity of a predetermined size is also provided in the part formed by the axial end surface of the steel plate 2 and the lower W4.The pouring is carried out from the bottom of the casting wrinkle on both sides of the steel plate 2 simultaneously by the molten metal force; After melting and solidifying the molten cast iron, the two are strongly metallurgically bonded.The cast alloy is 5
After performing a stress relief annealing heat treatment at 00° C. for 3 hours, the cast iron casting layer on the inner circumferential surface is cut and removed to obtain a bearing base metal in which the alloy white metal lining surface is formed of steel material.

As explained above, according to the present invention, since the bearing base metal has an overlapping structure in which cast iron and steel are metallically combined,
Adhesion to white metal is greatly improved compared to single cast iron. In addition, the bearing properties of this bearing, combined with the large damping capacity of cast iron itself, can be expected to be several steps better in terms of reliability and, ultimately, service life, compared to bearing base metals made of cast iron or steel alone.

According to the present invention, the steel material 2 is cast all over the part corresponding to the lining surface of the white metal, but it is also possible to cast the steel material 2 partially on the end face of the alloy, etc., where the white metal is likely to peel off during bearing operation. Various modifications can be made without changing the gist.

As explained above, according to the present invention, it is possible to provide a highly reliable white metal bearing base metal that has the advantages of both cast iron and steel bearing base metals.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view and a sectional view, respectively, showing an embodiment of a bearing base according to the present invention, and Figure 3 is a perspective view showing a part of a steel plate in the FS2 diagram. Base metal, 2... steel plate, 3...
Hot-dip tin plating, 4...lower mold, 5...rod,
6...Top mold. (7317) Agent Patent attorney Kensuke Norichika (and 1 other person) Figure 1 Figure 2

Claims (1)

[Claims] A bearing base metal made of cast iron whose bearing surface is lined with a bearing alloy, characterized in that a steel plate is cast-welded to the lining surface with molten cast iron.