JPH0853860A - Abrasion resistant composite - Google Patents

Abstract

PURPOSE:To prevent deterioration from occurring to penetrability into the ground even though a material is used for a long time by a method wherein a wear-resistant layer that extends from the front side to the rear side is provided to the upper face of an excavating blade. CONSTITUTION:In a ripper point where the edge 3 of an excavating blade of a bulldozer is formed with an upper face 1 and a lower face 2 joining together, a wear-resistant layer 4, extending from the edge 3 of the excavating blade to the rear side, is formed by building-up on the center of the upper face 1. The wear-resistant layer 4 is formed by arranging hard built-up layers including hard particles and soft built-up layers made of soft materials alternately, and thereby the wear-resistant layer 4 becomes hard to be broken off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant composite material requiring wear resistance such as a ripper point of a bulldozer and a bucket tooth of a hydraulic excavator.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 12 (a), a ripper point 100 of a bulldozer has a tip portion in which an upper surface 101 and a lower surface 102 meet each other when used for a long time. 103 disappears due to wear, and as shown in FIG.
4 becomes round, and the penetration into the ground 105 (excavation) deteriorates. For this purpose, the ripper point 100 in which the grounding portion 104 is rounded is used by turning it upside down as shown in FIG. 12C, but this turning operation lowers the efficiency of the excavation work. ing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and wear-resistant composite material capable of obtaining excellent excavation work efficiency with long life without deteriorating penetration into the ground even when used for a long time. Is provided.

[0004]

In order to achieve the above-mentioned object, the wear-resistant composite material according to the present invention has an upper surface side and a lower surface side that meet at the tip and the meeting part forms a cutting edge. A wear-resistant composite material for scraping debris, characterized in that a wear-resistant layer extending rearward from the excavating cutting edge is provided on at least a part of the top surface side of the wear-resistant composite material. It is a thing.

[0005]

When excavating with the wear resistant composite material of the present invention, the wear resistant layer extending rearward from the drilling edge is provided on the upper surface side, so that the tip of the wear resistant layer always provides a sharp drilling edge. Therefore, the penetration of the wear resistant composite material into the ground can always be kept good. Further, since the work of vertically inverting as in the past is not necessary, the excavation work efficiency does not decrease.

In the wear-resistant composite material of the present invention, the wear-resistant layer extending rearward from the cutting edge provided on at least a part of the top surface side of the wear-resistant composite material extends to the left and right sides of the top surface side. It may be provided on a portion other than the above, or may be provided on one side of the upper surface side. by the way,
If the wear-resistant layer extending rearward from the cutting edge is provided on the ridge formed to extend rearward from the digging edge, the ridge is formed by this ridge. The part that is thicker than the other parts, and because the wear resistant layer is formed on the ridges, it is less likely to disappear due to wear than other parts, and it is provided so that it extends backward from the cutting edge. It will retain a cone-like shape along the wear resistant layer. Further, on the lower surface side of the body-wear composite material, a ridge portion extending rearward from the digging edge is formed back to back with the ridge portion formed on the upper surface side. The ridge portion increases the wear margin, and the shape of the cone is maintained for a long time.

A wear-resistant layer is provided on a portion of the upper surface except for the left and right sides and extends rearward from the cutting edge, and is formed on the upper surface of the wear-resistant composite material by extending rearward from the cutting edge. If it is provided in the groove part, the left and right side parts on the upper surface side will be thicker and will not easily disappear due to wear, and the wear resistant composite material will maintain a plow-like shape. It is suitable for digging work.In addition, if a ridge extending rearward from the digging blade edge is formed on the lower surface side so as to be back to the groove formed on the upper surface side, the ridge on the lower surface side is worn. Therefore, the wear-resistant composite material having a shape similar to the plow can be used for a long period of time.

Further, the wear-resistant layer described above has a hard overlay layer containing hard particles and a soft overlay layer made of a soft material so as to form stripes along a direction transverse to the friction direction of the earth and stone. Wear-resistant composite material [alternating build-up A] which is alternately arranged in the friction direction, or a hard build-up layer in which the wear-resistant layer contains hard particles, and a soft material made of a soft material. It is possible to obtain a wear-resistant composite material [alternating overlay B] in which the overlaying layer and the overlaying layer are alternately arranged in a direction transverse to the frictional direction of the earth and stone so as to form stripes. . The operation of this alternate buildup will be described below.

The wear mode of the wear-resistant composite material for scraping off the debris differs depending on the size of the debris, and when the size of the debris is small, scratching (erosion) occurs, and this scratching is accompanied by grinding, as the size increases. And it changes to gouging. In the main form of wear from scratching to grinding, a harder material is generally more excellent in wear resistance, so a harder material is required, and in a wear of main form from grinding to gouging, a harder material is lost, so a material with toughness is required. To be Thus, a wear-resistant composite material composed of hard particles in a tough matrix can be considered as a versatile material, but if the mixture of debris size is biased toward the smaller or larger one by simply mixing it, I can't handle it enough.

Therefore, in the case where the distribution of the size of the earth and stone is biased toward the smaller side, as described above, the hard overlay layer containing the hard particles and the soft overlay layer made of the soft material are Provided is a wear-resistant composite material [alternating build-up A] which is alternately arranged in the friction direction to form a wear-resistant layer. Incidentally, sand with small particles tends to preferentially wear the soft facing layer, but since the soft facing layer and the hard facing layer are alternately arranged in the friction direction of the earth and stone, the hard facing layer The soft facing layer is protected, and mainly the soft facing layer efficiently scrapes off the sand having a small particle size, so that the debris can be scraped off well and the durability of the wear resistant material is secured. Further, when a large amount of rock contained in a small amount collides with the hard facing layer, the soft facing layer absorbs the impact on the hard facing layer, so that the hard facing layer is prevented from being broken.

In addition, in the case where the distribution of the size of the earth and stone is biased toward the larger side, the hard overlay layer containing the hard particles and the soft overlay layer made of the soft material as described above are made of the earth and stone. An abrasion-resistant composite material [alternating build-up B] is provided which is arranged alternately in the direction crossing the friction direction. It should be noted that rocks with a large grain size are subject to a large impact on the hard facing layer to damage the hard facing layer as described above, but the hard facing layer is arranged in stripes along the friction direction of the earth and stone. Therefore, it is difficult to apply a large impact to the hard overlay layer. In addition, similarly, the soft buildup layer arranged in stripes receives and relaxes the impact of rock with a large grain size.

In both the alternating arrangement of the earth and stone in the direction of friction, and the alternate arrangement of the earth and stone in the friction direction, the hard overlay is grasped by the toughness deformation of the soft overlay and the hard overlay is formed. It has the effect of being difficult to destroy.

As described above, an example of the build-up shape of the wear-resistant composite material [alternate build-up A] for scraping off the work that has a biased distribution of the size of the rock (average size of the rock D ≦ 15 cm) is shown in FIG. Is shown in. Note that FIG. 1A is a schematic cross-sectional view of the overlay layer, and FIG. 1B is a graph showing the distribution of debris size. FIG. 2 shows an example of the build-up shape of the wear-resistant composite material [alternating build-up B] for scraping off the debris that has a larger distribution of debris size (average size of debris D ≧ 15 cm). . Note that FIG. 2A is a schematic cross-sectional view of the overlay layer, and FIG. 2B is a graph showing the distribution of debris size.

As shown in FIG. 1 (a) and FIG. 1 (b), in both of the overlay overlay A and the overlay overlay B, the hard overlay layer A has a trapezoidal shape with a short cross-sectional shape and a soft overlay layer. Overlay layer B
It is preferable that the hard buildup layer A is formed first, and then the soft buildup layer B is formed so that the cross-sectional shape is a trapezoid or a triangle with a long top. This is because the soft overlay layer B has a function of gripping and protecting the hard overlay layer A by plastic deformation. Further, even if the soft buildup layer B is formed first and then the hard buildup layer A is formed, since the space between the hard buildup layers A is filled with the soft material, the rock strikes the hard buildup layer A from the side. And the advantage of improved impact resistance is obtained. In addition,
The width WA of the hard facing layer A (width in the middle portion of the thickness of the hard facing layer A) is twice the width WB of the soft facing layer B (width in the middle portion of the thickness of the soft facing layer B). The above is preferable to obtain sufficient wear resistance. Further, in the case of the overlay buildup B of FIG. 2, the width WB is preferably smaller than the average size SD of the earth and stone. The reason for this is that if the width WB is larger than D, the soft buildup layer B, which is soft, is abraded significantly.

[0015]

Next, specific examples of the wear resistant composite material according to the present invention will be described with reference to the drawings.

(Embodiment 1) Ripper point-1 of bulldozer [Structure] As shown in FIG. 3, at a ripper point of a bulldozer in which an upper surface 1 and a lower surface 2 meet at a tip to form a cutting edge 3 The wear-resistant layer 4 is built up on the upper surface 1 so as to extend rearward from the digging edge 3 by the following build-up procedure. It should be noted that the portion of the upper surface 1 on which the wear resistant layer 4 is built up and the portion of the lower surface 2 corresponding to that portion are bulged from both left and right side portions to form a wall thickness, and the central protrusion 5
Has become. Here, FIG. 3 (a) is a plan view of the ripper point viewed from the upper surface 1, FIG. 3 (b) is a side view, and FIG. 3 (c) is a cross section taken along the line AA of FIG. 3 (a). It is a figure. The portion of the ripper point 1 shown by the broken line is hollow.

[Overlay Procedure] Next, the procedure for forming the wear resistant layer 4 by the overlay layer forming mechanism shown in FIG. 4 will be described. In this mechanism, the arc electrode 6 made of a welding wire (made of mild steel, φ1.2 mm) protruding by 25 mm forms an angle θ1 (torch angle = 30 °) with respect to the right angle direction of the base material 7 arranged in the horizontal direction. It is arranged in a slanted shape. The welding current by the arc electrode 6 is 280 A, the welding voltage is 28 V, the supply speed of the welding wire is 100 g / min, and carbon dioxide is supplied as a shield gas to the welding area at 30 liters per minute. Hard particles 9 made of WC-7% Co particles having a diameter of 1.2 mm are supplied through a nozzle 10 to a molten pool 8 formed by an arc generated from the arc electrode 6.
The nozzle 10 is weaved at a frequency of 1.5 Hz (a vibration width of 30 mm in the front-back direction of the paper surface of FIG. 4), and the hard particles 9 are supplied thereto at a rate of 200 g / min.

Under the above-mentioned conditions, welding is performed rightward in the figure at a speed of 20 cm / min, and the wear-resistant layer 4 is built up to a thickness of 6 mm. [Evaluation] The ripper points thus manufactured are used for 100 hours in the ripper excavation work of bauxite. 10
The wear shape of this ripper point after 0 hours is shown in Fig. 3.
It is indicated by a chain double-dashed line in (a), (b) and (c). In this way, the tip of the ripper point after abrasion is not rounded but is sharp so as to form a cone along the abrasion resistant layer 4, and has a shape that does not hinder the continuation of excavation work.

(Example 2) Ripper point-2 of bulldozer [Structure] As shown in FIG. 5, at the ripper point of the bulldozer in which the excavating cutting edge 3 is formed at the meeting portion between the upper surface 1 and the lower surface 2, By the same build-up procedure as in Example 1, a wear-resistant layer 4 is formed on the upper surface 1 so as to extend rearward from the cutting edge 3 thereof. The wear-resistant layer 4 is formed on a portion of the central ridge 5 which is raised above the surrounding portion, and the wear-resistant layer 4 is not formed on the surrounding portion (protruding portion 11). The overhanging portion 11 has a lower wear resistance and a smaller thickness than the portion where the wear resistant layer 4 is provided, and thus is a portion that disappears early due to wear. Here, FIG. 5A is a plan view of the ripper point viewed from the upper surface 1.
5B is a side view, and FIG. 5C is B- in FIG. 3A.
It is B sectional drawing. The part indicated by the broken line is hollow.

[Evaluation] The ripper points thus prepared are used for 100 hours in the ripper excavation work of bauxite. The wear shape of the ripper point after 100 hours is shown by a chain double-dashed line in FIGS. 5 (a), (b) and (c). In this way, the tip of the ripper point after abrasion is not rounded but is sharp so as to form a cone along the abrasion resistant layer 4, and has a shape that does not hinder the continuation of excavation work. When the wear resistant layer 4 is also provided on the overhanging portion 11,
It provides a ripper point that is not suitable for excavating debris containing hard and large boulders, but is suitable for excavating like soft soil.

(Example 3) Ripper point-3 of bulldozer [Structure] As shown in FIG. 6, at the ripper point of the bulldozer in which the excavating cutting edge 3 is formed at the meeting portion between the upper surface 1 and the lower surface 2, By the same build-up procedure as in Example 1, a wear-resistant layer 4 is formed on the upper surface 1 so as to extend rearward from the cutting edge 3 thereof. However, at the ripper point of this embodiment, no ridge is provided on the lower surface 2, and the wear resistant layer 4 is provided with a width narrower than the width of the central ridge 5 on the upper surface 1. Since the lower surface 2 of the ripper point of this embodiment has no ridge and is thin, excavability is good. Here, FIG. 6A is a plan view of the ripper point viewed from the upper surface 1, and FIG.
Is a side view, and FIG. 6C is a cross-sectional view taken along the line CC of FIG. The part indicated by the broken line is hollow.

[Evaluation] The ripper points thus prepared are used for 100 hours in the ripper excavation work of bauxite. The wear shape of the ripper point after 100 hours is shown by a chain double-dashed line in FIGS. 6 (a), (b) and (c). In this way, the tip of the ripper point after abrasion is not rounded but is sharp so as to form a cone along the abrasion resistant layer 4, and has a shape that does not hinder the continuation of excavation work.

(Embodiment 4) Bucket tooth-1 of hydraulic excavator-1 [Structure] As shown in FIG. 7, a bucket tooth of a hydraulic excavator in which an excavating cutting edge 3 is formed at a meeting portion between an upper surface 1 and a lower surface 2. In the same manner as in Example 1, the wear-resistant layer 4 extending rearward from the cutting edge 3 is built up on the upper surface 1 by the same build-up procedure. However, in the bucket tooth of this embodiment, as shown in FIG. 7 (a), the wear resistant layer 4 is provided over the entire width of the excavating cutting edge 3 at the tip portion and only at the central portion behind it. A wear resistant layer 4 is provided. Since the wear resistant layer 4 is provided over the entire width of the tip of the excavating blade edge 3, the bucket tooth can maintain a shape like a plow at the initial stage of work and can excavate the soil well. In addition, D- in FIG.
In the section D, as shown in the sectional view of FIG. 7 (c), the swelling side protrusions 12 are formed on both sides of the wear resistant layer 4. Here, FIG. 7A is a plan view seen from the upper surface 1 of the bucket tooth.
7B is a side view, and FIG. 7C is D- of FIG. 7A.
It is a D sectional view. The part indicated by the broken line is hollow.

[Evaluation] The bucket tooth manufactured in this manner is used for 100 hours for excavating bauxite. The wear shape of the bucket tooth after 100 hours is shown by a chain double-dashed line in FIGS. 7 (a), (b), and (c). In this way, the tip of the bucket tooth after wear is not rounded but sharp, and at the same time the side protrusions remain, so it is suitable for excavator bucket teeth and it has a shape that is easy to dig up soil such as plow. I am maintaining.

(Embodiment 5) Bucket tooth-2 of hydraulic excavator-2 (side tooth) [Structure] As shown in FIG. 8, a hydraulic excavator in which an excavating cutting edge 3 is formed at a meeting portion between an upper surface 1 and a lower surface 2. In the bucket tooth, the abrasion resistant layer 4 is formed on the upper surface 1 so as to extend rearward from the digging edge 3 by the same overlaying procedure as in the first embodiment. However, in the bucket tooth of this embodiment, as shown in FIG. 8 (a), the wear resistant layer 4 is provided over the entire width of the excavating cutting edge 3 at the tip and one side is provided behind it. Only the wear resistant layer 4 is provided. The reason for this is that this bucket tooth is a side tooth and the side portion on which the abrasion resistant layer 4 is provided becomes the outermost end portion of the bucket of the hydraulic excavator and is a portion that is easily worn. Further, the abrasion-resistant layer 4 is provided over the entire width of the tip of the excavating cutting edge 3 in the same manner as the bucket tooth -1 of Example 4 to maintain a shape like a plow at the initial stage of work and to satisfactorily remove soil. Because you can dig up.
In addition, in the EE cross section of FIG. 8A, as shown in FIG. 8C, which is a cross-sectional view thereof, swelling side protrusions 12 are formed on both sides, and the wear-resistant tank 4 has only one side. Is formed in. Here, FIG. 8A is a plan view seen from the upper surface 1 of the bucket tooth, FIG. 8B is a side view, and FIG. 8C is a sectional view taken along line EE of FIG. 8A. It is a figure. The part indicated by the broken line is hollow.

[Evaluation] The bucket tooth thus prepared is used for 100 hours for excavating bauxite. The wear shape of the bucket tooth after 100 hours is shown by a chain double-dashed line in FIGS. 8 (a), (b), and (c). In this way, the tip of the bucket tooth after wear is not rounded and is sharpened to one side, and is sharpened to one side to maintain the wall thickness to form a biased plow shape. It has a shape that does not hinder the continuation of excavation work.

Example 6 Alternate Overlay A (Average Size of Debris D ≦ 15 cm) In order to show the effect of the alternate overlay overlay A, alternate overlay overlay is applied to the ripper point of the bulldozer as follows and evaluated.

[Structure] At the ripper point of the bulldozer,
A test piece is produced by overlaying as follows.
First, by using the build-up mechanism shown in FIG. 4 as in the first embodiment, a length of 70 mm and a width of 25 are obtained as shown in FIG.
Four hard facing layers 20 with a thickness of 6 mm and a thickness of 6 mm are formed in a direction crossing the friction direction of the earth and stone. Next, using the overlay mechanism of FIG. 4, a welding current of 295 A, a welding voltage of 32 V, a welding speed of 25 cm / min, and a weaving of 1.5 Hz and 4 mm were used.
3 layers of 70 mm in length, 20 mm in width, and 6 mm in thickness without supplying hard particles 9 instead of the vibration width
1 is formed between the four hard overlay layers 20. The hard buildup layer 20 and the soft buildup layer 21 constitute the wear resistant layer 4. Here, FIG. 9A is a plan view of the ripper point viewed from the upper surface 1 side, and FIG. 9B is a side view. The part indicated by the broken line is hollow.

[Evaluation] The test piece manufactured as described above is mounted on a bulldozer, and earth and stone having an average particle size of 10 cm are excavated, and the wear shape and the presence or absence of chipping of the hard overlay layer are evaluated. After 32 hours of excavation work, the ripper points exhibited a wear profile as shown by the chain double-dashed line in FIG.
No chipping of the hard overlay layer 20 was found. As described above, the ripper point [alternating build-up A] of the present invention maintains the shape in which the tip portion is sharp even after abrasion, and since no chipping is observed, it can be further used for excavation.

(Embodiment 7) Alternate buildup B (average size of earth and stones D ≧ 15 cm) In order to show the effect of the alternate buildup B, the alternate buildup is applied to the ripper points of the bulldozer as follows.

[Structure] At the ripper point of the bulldozer,
A test piece is produced by overlaying as follows.
First, by using the build-up mechanism of FIG. 4 as in Example 1, two hard build-up layers 20 having a length of 150 mm are formed in the rubbing direction of the earth and stone as shown in FIG. Next, in the build-up mechanism of FIG. 4, a soft build-up layer 21 having a length of 160 mm is formed between the two hard build-up layers 20 under the same conditions as in Example 6 without supplying the hard particles 9. To be done. The hard buildup layer 20 and the soft buildup layer 21 constitute the wear resistant layer 4. Here, FIG. 10A is a plan view of the ripper point viewed from the upper surface 1 side.
(B) is a side view. The part indicated by the broken line is hollow. Moreover, the FF sectional view of FIG.
1 is shown. As shown in FIGS. 11 and 10 (a), each of the two hard facing layers 20 has a substantially trapezoidal cross-sectional shape with an upper side surface width of 25 mm, a lower side surface width of 30 mm, and a thickness of 6 mm. The distance between the two hard facing layers 20 is 20 mm on the upper side and 10 mm on the lower side. Therefore, the width of the upper side surface of the soft facing layer 21 is 20 m.
It has a substantially inverted triangular cross section with a height of 10 mm.

[Evaluation] The test piece produced as described above was mounted on a bulldozer, and rock bed rock made of chert rock that had not been loosened and blasted was excavated with a ripper. Is evaluated. The size of the rock to be excavated is 10 to 80 cm (about 40 cm on average). After the excavation work for 2 hours, the ripper point exhibited a wear shape as shown by a chain double-dashed line in FIG. 11, and no chipping of the hard facing layer 20 was found. As described above, the ripper point [alternating overlay B] of the present invention does not cause chipping even when the size of the earth and stone is large, and since the tip portion maintains a sharp shape even after abrasion, it should be used for long-time excavation. You can

Even if the wear resistant layer 4 formed by the alternating build-ups A and B as described above is provided at the ripper point of a bulldozer or the lower surface of the bucket tooth of a hydraulic excavator, the hard build-up layer is unlikely to be chipped, as in the above embodiment. And the wear resistance is further enhanced.

[0034]

According to the wear-resistant composite material of the present invention, it is possible to always maintain good penetration into the ground by providing the excavating cutting edge whose wear-resistant layer has a sharp tip. If this wear-resistant layer is provided on the ridge formed to extend rearward from the cutting edge, the ridge is thick and the wear-resistant layer is formed on the ridge. Therefore, it is less likely to disappear due to abrasion than other portions, and the shape like a cone along the abrasion resistant layer provided so as to extend rearward from the excavation blade edge is maintained. Further, by forming a ridge portion on the lower surface side so as to be back-to-back with this ridge portion, the ridge portion on the lower surface side increases the wear allowance and the shape of the cone is maintained for a long time. .

If the wear-resistant layer provided on the upper surface side except for the left and right side portions is provided in the groove, the left and right side portions on the upper surface side become thick and are hard to disappear by abrasion. The wear-resistant composite material maintains a plow-like shape, which is suitable for excavating soil. Furthermore, if a ridge is formed on the lower surface side so as to be back-to-back with the groove on the upper surface, The ridge portion on the side increases the wear margin, and the wear-resistant composite material having the shape like the plow can be used for a long period of time.

Further, as the wear resistant layer of the wear resistant composite material, a hard facing layer containing hard particles and a soft facing layer made of a soft material are alternately arranged in a direction corresponding to the friction direction of the earth and stone. If so, a wear-resistant layer that is less likely to be damaged is obtained, and the life of the wear-resistant composite material is extended.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an alternating overlay A of the present invention.

FIG. 2 is a diagram illustrating an alternate buildup B of the present invention.

FIG. 3 is a diagram showing a ripper point according to an embodiment of the present invention.

FIG. 4 is a diagram showing a build-up mechanism used in an embodiment of the present invention.

FIG. 5 is a diagram showing a ripper point according to another embodiment of the present invention.

FIG. 6 is a diagram showing a ripper point according to still another embodiment of the present invention.

FIG. 7 is a diagram showing a bucket tooth according to an embodiment of the present invention.

FIG. 8 is a diagram showing a bucket tooth according to another embodiment of the present invention.

FIG. 9 is a diagram showing a ripper point provided with the alternate overlay A of the present invention.

FIG. 10 is a diagram showing a ripper point provided with the alternate overlaying B of the present invention.

11 is a cross-sectional view of a wear-resistant layer formed by the alternate buildup B of FIG.

FIG. 12 is a diagram showing a problem of a conventional ripper point.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper surface 2 Lower surface 3 Excavation edge 4 Wear resistant layer 5 Central ridge 6 Arc electrode 7 Base metal 8 Molten pool 9 Hard particles 10 Nozzle 11 Overhanging part 12 Side ridges 20, A Hard facing layer 21, B Soft meat Stratum

Claims (9)

[Claims] 1. A wear-resistant composite material for scraping off debris, wherein an upper surface side and a lower surface side meet at a tip, and the meeting portion forms a cutting edge, and at least an upper surface side of the wear-resistant composite material. A wear-resistant composite material, characterized in that a wear-resistant layer extending rearward from the excavating cutting edge is provided on a part of the upper surface side thereof. 2. A wear-resistant layer, which is provided on at least a part of the upper surface side of the wear-resistant composite material and extends rearward from a cutting edge, is provided at a portion excluding the left and right side portions of the upper surface side. The wear-resistant composite material according to claim 1, wherein: 3. A wear-resistant layer extending rearward from a cutting edge provided on at least a part of the upper surface of the wear-resistant composite material is provided on one side of the upper surface side. The wear-resistant composite material according to claim 1, wherein 4. The wear resistant layer extending rearward from the drilling edge is provided on a ridge extending rearward from the drilling edge on the upper surface side of the wear resistant composite material. Item 4. The wear resistant composite material according to Item 2 or 3. 5. A ridge formed on the lower surface side of the wear-resistant composite material and extending rearward from the digging edge in back-to-back relation with the ridge formed on the upper surface side. Item 5. The wear resistant composite material according to item 4. 6. The wear resistant layer extending rearward from the excavating edge is provided in a groove formed on the upper surface side of the wear resistant composite material so as to extend rearward from the excavating edge. The wear resistant composite material according to claim 2. 7. A ridge formed on the lower surface side of the wear-resistant composite material so as to be back-to-back with a groove formed on the upper surface side and extending rearward from the cutting edge. The wear resistant composite material described in. 8. A wear-resistant composite material for scraping off debris, wherein an upper surface side and a lower surface side meet at a tip, and the meeting portion forms a cutting edge, and only on the upper surface side of the wear-resistant composite material. , A hard overlay layer comprising hard particles,
A wear-resistant layer made of a soft material and alternately arranged in the friction direction so as to form stripes along the direction traversing the friction direction of the debris, respectively, so that the wear-resistant layer extends rearward from the cutting edge. A wear-resistant composite material, which is characterized in that 9. A wear-resistant composite material for scraping off debris, wherein an upper surface side and a lower surface side meet at a tip, and the meeting portion forms an excavating cutting edge, and only on the upper surface side of the wear-resistant composite material. , A hard overlay layer comprising hard particles,
A wear-resistant layer composed of a soft overlay layer made of a soft material and alternately arranged in a direction transverse to the friction direction of the earth and stone so as to form stripes along the friction direction of the earth and stone so that it extends rearward from the cutting edge. A wear-resistant composite material, which is characterized in that