JPS6058692B2 - Wear-resistant composite components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for bonding to structural parts of civil engineering and construction machinery, for example, parts that are exposed to environments where they are susceptible to wear due to contact with rocks, sand, mud, cement, asphalt, etc. The present invention relates to a wear-resistant composite member suitable for use as a wear-resistant composite member.

Conventionally, the cutting edges of excavators such as those used in civil engineering and construction machinery, such as bulldozers and excavators, are subject to rapid wear, so as a measure to prevent this, carbide materials have been added to the tips of these parts, which are mainly made of steel. It is used by brazing or by applying a wear-resistant alloy such as Stellite. Among these, sintered carbide materials composed of a binder phase of Co and a dispersed phase of tungsten carbide exhibit excellent wear resistance against rocks, sand, mud, cement, asphalt, etc. This material is ideal as a protective member for the above-mentioned civil engineering and construction machine parts, but since this carbide material is silver-brazed to the tip of the civil engineering and construction machine parts as mentioned above, its Since the joints often break during use and the cemented carbide material falls off from the component, it has often been impossible to take advantage of its good wear resistance. On the other hand, when you feel a wear-resistant alloy such as stellite, this build-up layer has excellent bonding strength with the above-mentioned parts, but it has poor wear resistance against rocks, sand, mudstone, cement, and asphalt. In this respect, they are several steps inferior to cemented carbide materials, so in the end, the wear life of the tip of the component is similar for both. Furthermore, silver brazing and tactile welding work is difficult to perform easily at civil engineering construction sites, so parts must be removed from the machine body or the machine itself must be brought to a welding shop to be joined. , which was extremely inconvenient. Therefore, the same applicant had previously applied for
No. 1411, in order to solve the above-mentioned inconveniences seen in the conventional wear prevention measures for the tips of parts of civil engineering and construction machinery, a binder phase made of copper or copper alloy and ceramics, cermets, and carbide. Two layers: an inner layer composed of a dispersed phase consisting of one or more types of fine lumps and fine grains of materials, and an outer layer made of a steel material metallurgically bonded and integrated with the inner layer. A composite member that has a structure, has excellent wear resistance, and can be firmly bonded to the tip of a component, etc. (hereinafter referred to as a prior invention composite member)
proposed.

That is, as shown in a schematic perspective view in FIG. 1, the above-mentioned prior invention composite member contains any one of pulverized ceramic, cermet, and cemented carbide in the binder phase of copper or copper alloy 1. Dispersed grains 2 composed of fine lumps or fine grains of one type or a mixture of two or more types are dispersed, and these dispersed grains 2 are metallurgically joined to the binder phase copper or copper alloy 1, Furthermore, the outside is surrounded by a steel square vibrator 3, and this steel square vibrator 3 also has a structure in which it is metallurgically strongly bonded to copper or copper alloy 1. Therefore, civil engineering construction machines, etc. Since they are usually made of steel, the mechanical parts and the outer layer of the composite member can be easily joined by electric welding. However, even with this level of welding, it is common practice to carry the parts back to the factory, and we are faced with the practical problem of not being able to simply join them at the site of civil engineering work. I have no choice but to.

Therefore, in the case where welding is not performed, it is conceivable to attach the above-mentioned prior invention composite member to a civil engineering construction machine part by bolting, but to do so, it is necessary to provide bolt holes in the prior invention composite member. however,
In the prior invention composite member having the structure shown in FIG.
Drilling the mounting bolt holes requires drilling.
This is not possible because the drill bit will be damaged due to the dispersed particles in the inner layer. From the above-mentioned viewpoint, the present inventors have developed a product that has better wear resistance than stellite against rocks, sand, mudstone, cement, asphalt, etc., and that is suitable for parts that require wear resistance. Easy, easy! Moreover, as a result of various studies in order to obtain a wear-resistant member that can be firmly bonded, we found that it is possible to remove dispersed particles in the inner layer at predetermined locations in a wear-resistant composite member shown in Figure 1. They came to the conclusion that bolt holes could be easily drilled in those locations.

Therefore, this invention was made based on the above study results, and consists of a binder phase made of copper or a copper alloy, and one or more of fine lumps and fine grains of ceramic, cermet, and superhard materials. It has a two-layer structure: an inner layer composed of a dispersed phase of 4, and an outer layer made of a steel material that is metallurgically bonded and integrated with the inner layer, and the inner layer is the part where the bolt holes for mounting are drilled. By constructing the part with a binder phase or a steel material in which the dispersed phase is missing, it is possible to easily drill holes for attaching to civil engineering and construction machinery parts with bolts. This is a composite member with features.

Note that the wear-resistant composite member of the present invention can be manufactured by various known methods.

That is, for example, prepare a steel pipe with an arbitrary shape,
Either a steel block is set in a predetermined position within this steel pipe, or copper or copper alloy powder is compression molded and set, and then one or more of crushed ceramic, cermet, and cemented carbide and copper or copper The alloy powder fixing mixture is filled and sealed, then heated to a predetermined temperature at which the copper or copper alloy melts, and held for a predetermined time to disperse the copper and copper alloy onto the grains, the contact surfaces of the steel pipes, and the steel blocks. When the material is set, it can be produced by reacting with the contact surface to form a metallurgical bond, and finally cooling and solidifying it. Next, the wear-resistant composite member of the present invention will be explained by way of examples with reference to the drawings.

Example 1 The composite member of the present invention, which is schematically shown in a schematic longitudinal sectional front view in FIG. 2a and in a schematic longitudinal sectional side view in FIG.
7077! It is composed of a steel pipe (2.5wn build-up) 3 with dimensions of 13wn wide x 250m long, and the inner layer is
A dispersed phase 2 consisting of uniformly dispersed fine grains of superhard material, and C
It is composed of a binder phase 1 of u alloy (Cu-O weight % Zn), and the part corresponding to the part attachment part has a vertical 7.5
It has a structure in which a steel material 4 having dimensions of wn x width 13Tn x length 25'' is installed.

In addition, when installing the composite member of the present invention, mounting bolt holes 5 are formed at appropriate locations along the length direction of the steel material 4. Example 2 The composite member of the present invention similarly shown in FIGS. 3a and 3b is
The binder phase 1 has a composition of CU-3 weight%Mn-5wt%Zn-5wt%Ni, and a steel material 4 with a thickness of 7.57m in which a bolt hole 5 is formed during installation is attached to each steel pipe 3. The composite member of the present invention was manufactured under the same conditions as Example 1, except that the composite member of the present invention was fitted at both end portions.

Example 3 The composite member of the present invention, also shown in FIGS. 4a and 4b, was
The binder phase 1 in the inner layer is made of a Cu alloy with a composition of CU-4 and Zn, and one end of the steel pipe 3 has a thickness of 8W!
This composite member has the same structure as the composite member of the present invention shown in Example 2 above, except that the entire length of the composite member is made of the same sintered Cu alloy 4″ as the binder phase 1.

Example 4 The composite member of the present invention shown in FIGS. 5a and 5b has a structure in which the dispersed phase 2 is composed of cermet, and the steel members 4 are fitted at positions 50wn inward from the end faces of the steel pipes 3. The composite member of the present invention was manufactured under the same conditions as the composite member of the present invention in Example 2 except for the following.

Embodiment 5 The composite member of the present invention shown in FIGS. 6 a and b is the same as the composite member of the present invention shown in Example 1 (see FIGS. 2 a and b), in which both ends of the steel pipe 3 are Each is 15Tm long x 13w1n wide x 7.57077 thick! It has a structure in which a steel material 4 having dimensions of .

Example 6 The composite member of the present invention shown in FIGS. 7a and b is as follows:
The outer layer is 38cm long x 13cm wide? It is composed of a steel pipe (wall thickness 2.5 wrm) 3 having a length of 250 gourds, and the binder phase 1 in the inner layer is a Cu alloy having a composition of CU-1 weight% Mn-3 weight% CO, and Each of the dispersed phases 2 is made of a carbide material, and three cylindrical steel materials (13 mm diameter x 7.9 m in size) 4'' are arranged in parallel at the upper position inside the steel pipe 3, and the bolt holes 5 are formed during installation. It has a structure that has been installed as follows.

The composite members of the present invention shown in Examples 1 to 6 above can significantly shorten the replacement time compared to when they are attached to mechanical parts by welding, and for example, when attached to a bulldozer blade. Although it took several days to replace by welding, the composite member of the present invention can be replaced by bolts and
The nano-4 can be replaced in a few hours, and the wear life in experimental operations was no different from that of the one installed by welding.

As mentioned above, the wear-resistant composite member of the present invention can be easily attached to civil engineering and construction machine parts etc. with bolts, so the installation time can be significantly shortened, and moreover, it has excellent wear resistance. Therefore, it has industrially useful properties such as being able to be used for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the composite member of the prior invention, and FIGS.
FIG. 7 is a diagram showing an example of the composite member of the present invention,
8A is a schematic longitudinal sectional front view, b is a schematic longitudinal sectional side view, and FIG. 8 is a schematic longitudinal sectional view of a main part showing the manner in which the composite member of the present invention is attached. In the drawing, 1...bond phase, 2...
・Dispersed phase, 3... Outer layer part, 4, 4'', 4''...
...Bolt hole forming part for installation, 5...
bolt hole.

Claims (1)

[Claims] 1. An inner layer composed of a binder phase made of copper or a copper alloy and a dispersed phase made of one or more of fine lumps and fine grains of ceramics, cermets, and superhard materials, and this It has a two-layer structure with an outer layer made of a steel material metallurgically bonded and integrated with the steel material, and the inner layer of the part where the mounting bolt hole is drilled is a binder phase or steel material in which the dispersed phase is missing. A wear-resistant composite member characterized by being composed of only.