JP3485971B2 - Wear-resistant material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant member,
In particular, it is suitable for preventing abrasion of excavating bits and excavator main bodies such as urban civil engineering.

[0002]

2. Description of the Related Art Conventionally, a wear resistant member of this type has a cemented carbide tip on the shank portion of a drill bit separately from the cutting edge portion, as disclosed in, for example, Japanese Utility Model Laid-Open No. 59-14897. There are known ones that are attached or surface-hardened. It is also known that the wear-resistant member described above is provided in a portion of the excavator body that is heavily worn.

[0003]

However, the surface-hardened build-up has problems such as rapid wear and increased number of repairs, and brazing of carbide tips does not normally have brazing equipment. There is a problem that it cannot be used in the field.

In view of the above, the present invention intends to provide a wear resistant member which can be easily applied at an excavation site.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and is made by integrally brazing a wear-resistant plate made of cemented carbide and a reinforcing plate made of steel. The reinforcing plate is made of an abradable member and has a thickness A
Is 1 to 5 mm, the ratio A / B is 1: 1 to 1:10 with respect to the thickness B of the wear resistant plate, and the outer peripheral surface of the wear resistant plate is A weldable portion is formed in a surplus portion which is larger than the shape surface and where the wear resistant plate portion is not brazed. In this case, the weldable part is the reinforcement plate.
The outer contour surface of the plate may be formed on the outer contour surface of the reinforcing plate protruding from the outer periphery of the wear resistant plate or may be formed between two opposing wear resistant plates. It is a thing.

[0006]

Since the wear resistant member of the present invention has the weldable portion formed on the steel reinforcing plate, it can be easily welded to the necessary member at the excavation site. Further, by limiting the thickness of the reinforcing member, the thermal effect due to welding is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the wear resistant member of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a wear-resistant member having a substantially rectangular plate shape, and a wear-resistant plate 2 made of cemented carbide and a reinforcing plate 3 made of steel are brazed. Are integrated by. In this case, the brazing is, for example,
Silver brazing, copper brazing, silver / copper / silver sandwich brazing and the like are applied. And this wear resistant pre-coat
The end portion and the intermediate portion of the grate 3 are the excess thickness portion. This extra portion constitutes the weldable portion 4, and in the illustrated case, the V-shaped recessed portion at the longitudinal end constitutes the weldable portion 4 such as fillet welding.

Further, the reinforcing plate 3 and the wear resistant plate
The grate 2 has thicknesses A and B, respectively, but the thickness A of the reinforcing plate 3 is set to 1 to 5 mm. The relationship of these thicknesses is that A / B is 1: 1 to 1:10. This is due to the difference in thermal expansion coefficient between the two
The reinforcing plate 3 having deformability is subjected to stress strain due to welding to reduce the stress strain due to the wear resistant plate 2 and prevent cracks. If the reinforcing plate 3 has a thickness of less than 1 mm, melting due to welding causes a problem,
If it exceeds, the load of brazing strain is applied to the wear resistant plate 2, which is a problem. As for the thickness ratio A / B, if the thickness of the reinforcing plate 3 becomes large, the wear resistance plate 2 will be burdened with brazing strain at the time of integration. If the thickness of the wear resistant plate 2 exceeds 10 times, it is disadvantageous in terms of resource saving.

FIGS. 3 to 8 show the second to the second parts of the wear resistant member 1.
7A and 7B respectively show the seventh embodiment, and FIG.
In (b), the rectangular plate-shaped reinforcing plate 3 has a substantially rectangular plate shape in which one long side is mountain-shaped, and its outer contour surface is smaller than that of the reinforcing plate 3. The wear resistant plate 2 is brazed. Then, a weldable portion 4 is configured in a surplus portion formed on the outer periphery of the reinforcing plate 3.

FIGS. 4 (a) and 4 (b) show a case where two rectangular plate-shaped wear resistant plates 2 are brazed.
A weldable portion 4 is formed on the outer peripheral edge of the reinforcing plate 3. 5 (a) and 5 (b), a hexagonal plate-shaped wear resistant plate 2 is brazed, and a weldable portion 4 is formed on the outer peripheral edge of the reinforcing plate 3 as well. It has become.

On the other hand, FIGS. 6A and 6B and FIG.
(A) and (b) are brazing plates 2 on opposite sides of a reinforcing plate 3 which are oppositely brazed to each other, and a weldable part 4 is formed in the middle part thereof. . In this case, the former wear-resistant plates 2 are each divided into two parts, which are brazed in the step portions 5 of the reinforcing plate 3. The latter reinforcing plate 3 has an elongated hole 6 for attachment formed in an intermediate portion.
This is an additional attachment means to the weldable part 4 and is attached to a member requiring wear resistance by the use of a head bolt (not shown).

8 (a) and 8 (b) show a pair of wear-resistant plates 2 arranged to face each other, the protruding surfaces of which form V-shaped projections. A threaded hole 7 for mounting is provided in an intermediate portion of the weldable portion 4 of the welding device 3.

Abrasion resistant member 1 thus constructed
Is welded to the hatched portion of, for example, the drill bit 10, the auger 20, the casing tube 30 of the drilling rig, as seen in FIGS. In this case, in FIG. 9, the wear-resistant member 1 is brazed to the main body side portion of the drill bit 10 including the carbide tip 11. In FIGS. 10 (a) and 10 (b), the wear-resistant member 1 is used. Is welded to the outer peripheral edge of the spiral screw 22 of the earth auger 20 having the auger bit 21 attached to the outer periphery of the spiral screw 22. In addition, in FIG. 11, the wear resistant member 1 is welded to the casing tube 30 to which the excavating bit 31 is attached, at the front and rear portions in the rotational direction of the excavating bit 31, and at the outer peripheral side portion. It is welded around the mounting bolt 32.

[0015]

As described above, according to the present invention, in the wear resistant member 1, the thickness relationship between the wear resistant plate 2 and the reinforcing plate 3 is specified, and both are integrated by brazing. At the same time, the weldable portion 4 is formed in the surplus portion of the reinforcing plate 3. Therefore, the wear resistant member 1 is easy to carry and can be easily welded to a member requiring wear resistance, and the wear resistant plate is not so affected by brazing and welding distortion. Has the advantage.

[Brief description of drawings]

FIG. 1 is a conceptual explanatory view showing an embodiment of a wear resistant member of the present invention, (a) is a front view, (b) is a bottom view,

FIG. 2 is a perspective view,

FIG. 3 is a conceptual explanatory view showing a second embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a perspective view,

FIG. 4 is a conceptual explanatory view showing a third embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a perspective view,

FIG. 5 is a conceptual explanatory view showing a fourth embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a perspective view,

FIG. 6 is a conceptual explanatory view showing a fifth embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a bottom view,

FIG. 7 is a conceptual explanatory view showing a sixth embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a bottom view,

FIG. 8 is a conceptual explanatory view showing a seventh embodiment of the wear resistant member of the present invention, (a) is a front view, (b) is a bottom view,

FIG. 9 is a conceptual explanatory view showing an embodiment in which the wear resistant member of the present invention is welded to a drill bit, (a) is a front view,
(B) is a plan view,

FIG. 10 is a conceptual perspective view showing a modified example in which the wear resistant member of the present invention is welded to an earth auger;

FIG. 11 is a conceptual front view showing another embodiment in which the wear resistant member of the present invention is welded to a casing tube.

[Explanation of symbols]

1 Wear resistant member 2 Abrasion resistant plate 3 Reinforcing plate 4 Weldable part 6 slots 7 screw holes 10 drill bits 20 Earth Ogre 30 casing tubes

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Claims (4)

(57) [Claims] 1. A wear resistant member in which a wear resistant plate 2 made of cemented carbide and a reinforcing plate 3 made of steel are integrated by brazing, wherein the reinforcing plate 3 has a thickness The thickness A is 1 to 5 mm, the ratio A / B is 1: 1 to 1:10 with respect to the thickness B of the wear resistant plate 2, and the outer contour surface is the wear resistant plate. -A wear-resistant member characterized in that a weldable portion 4 is formed in a surplus portion which is larger than the outer shape surface of the plate 2 and which is not brazed with the wear-resistant plate 3. . 2. The outer surface of the reinforcing plate 3 according to claim 1 is provided with the weldable portion 4 projecting from the outer periphery of the wear resistant plate 2. Abradable member. 3. The outer shape surface of the reinforcing plate 3 according to claim 1 is brazed with two opposing wear resistant plates 2 and a weldable portion 4 is formed therebetween. The wear resistant member according to claim 1 or 2. 4. The weldable portion 4 according to claim 3 is provided with an elongated hole 6 or a screw hole 7 for attachment.
The wear resistant member described.