JPH10176315A - Edge member for snow removal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by padding and welding an abrasion resistant material of specific composition on at least one end part of a grounding blade in the lengthy direction to make contact with the shoulder side. SOLUTION: An end part to make layers 9, 9' contact with a road shoulder by vertical inversion and left and right switching is made by providing the abrasion resistant padded and welded layers 9, 9' on upper and lower both end parts of, for example, a set of edge members 1, 1' installed on a snow removal vehicle. Length 1 of the layers 9, 9' is set less than 1/2 of overall length L of an edge member, and abrasion as a whole is uniformed. Hardness of an abrasion resistant material is increased by containing 3-6 weight % of B of boron carbide, etc., in a single (but except for single Ni self-dissolved alloy) or mixed alloy of an Fe base alloy, a Co base alloy and an Ni base alloy. Additionally, more than one kind of NbC, TiC, Mo2 C, Cr3 C2 , WC, W2 C, VC, TaC, ZrC is contained in the abrasion resistant material as required, and padding and welding is to be plasma powder padding and welding. Consequently, it is possible to remarkably improve longevity of the edge member and to reduce cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow removal edge member used for a snow removal vehicle, and more particularly, to an edge member which makes it hard to wear a ground contact blade of the edge member and uniformly wears the blade as a whole. The present invention relates to an edge member for snow removal in which the durability (life) of the member is significantly improved.

[0002]

2. Description of the Related Art FIG. 1 shows an edge member 1 (1 ') used when performing snow removal work using a snow removal vehicle such as a snow removal grater, a snow removal dozer and a snow removal loader. As shown in the figure, the cross section is approximately three months, mounting holes 2 (2 ') are provided at regular intervals in the length direction, and the grounding blades 3a and 3b
(3a 'and 3b') and, as shown in FIG. 2, the cross section is substantially trapezoidal, mounting holes 2 are provided at regular intervals in the length direction, and grounding blades 3a and 3b are provided in the grounding portion. What is formed is generally known.

Generally, a plurality of the edge members are mounted on a snow removing vehicle and used as a set. FIG.
Shows a case where two edge members 1 and 1 'are used as one set. In the conventional snow removing edge member described above, when the vehicle running on the road surface uses spiked tires to remove the snow compaction on the road surface and the ice layer formed on the ice burn (on the frozen road surface), Since the surface of the compacted snow or ice layer was roughened by the spike tire, only the surface layer on the compacted snow or ice layer had to be removed.

However, recently, the use of spiked tires has been banned, and it has become necessary to remove snow more completely (until the road surface can be seen) than before. For this reason, the edge member grounding blade is more worn out than in the prior art, and the life has been significantly reduced. Therefore, in recent years, in order to extend the life of the grounding blade, a material (powder) excellent in wear resistance is welded over the entire length in the length direction of the grounding blade.

[0005]

However, as shown in FIG. 3, the road surface 4 is generally not flat but curved, and the road shoulder side 4b (the area adjacent to the sidewalk 5) is lower than the central portion 4a. When the snow is removed from the road shoulder side 4b, the edge member 1 (1 ') is tilted as shown in FIG. 3 to perform the snow removal operation. 7 ') wear becomes severe. For this reason, the edge member 1 (1 ′) can be used except for the end portion.
As a whole, it is extremely uneconomical because it becomes unusable. In addition, overlay welding of the wear-resistant material over the entire length of the grounding blade is costly and extremely disadvantageous in terms of economy.

An object of the present invention is to provide an inexpensive edge member in which the durability of the edge member is improved and the entire edge member is uniformly worn.

According to a second aspect of the present invention, in addition to the object of the first aspect, a new wear-resistant material is used.
It is an object of the present invention to provide an edge member having significantly improved durability.

[0008]

According to the first aspect of the present invention, there is provided a method for welding a wear-resistant material to a grounding blade of an edge member attached to a snowplow. The build-up welding is performed on at least a part of the outer periphery of at least one end in the length direction which can abut on the road shoulder side of the ground blade.

According to a second aspect of the present invention, there is provided the wear-resistant material according to the first aspect, wherein the wear-resistant material is a Fe-based alloy, a Co-based alloy,
It is characterized by using a wear-resistant material containing 3 to 6% by weight of B in a single base alloy (except for a Ni self-fluxing alloy alone) or a mixed alloy.

The above-mentioned wear-resistant material is a novel material,
It has been found by the present inventors for the first time that the inclusion of B in a specific amount increases the hardness and suppresses the decrease in hardness at high temperatures.

[0011]

Next, an embodiment of the present invention will be described. The edge member used in the present invention may be any, and is not particularly limited. For example, as shown in FIG. 4, a snow trap having a substantially trapezoidal cross section and an edge for a snow removing loader, and as shown in FIG. 5, for a snow removing grader having a substantially three-month cross section. As shown in the edge and FIG. 6, there is a snow removal grader edge having a substantially crescent cross section and a large number of grooves 8 formed in the ground contact blade.

According to the present invention, build-up welding is performed only on the edge of the edge member where the ground blade is severely worn. FIG. 1 shows a case where two edge members (1 and 1 ') are mounted and used as a set. In the present invention, the grounding blade end portions to be overlaid are edge members 1 and 1'. It can be a part that can contact the shoulder of the road. The build-up welding is preferably performed on both ends of the pair of edge members in the longitudinal direction of the grounding blade, but may be performed only on one end where wear is particularly severe.

The edge member is generally used by mounting one to six edge members to various snow removing machines. When three or more sheets are used, no overlay welding is performed on the central edge member excluding both ends. The end of the grounding blade on which the build-up welding is performed may be build-up welded on the entire outer periphery, or may be a part.

As the overlay welding, plasma powder overlay welding (plasma arc welding) is particularly preferable because the heat affected zone of the weld is small and distortion to the base material is small.

Examples of the wear-resistant material to be welded by overlay welding include white cast iron, high Cr-Mo cast iron or cast steel, and Cr-
Mo-VW-based cast iron or cast steel, cemented carbide, or wear-resistant ceramics such as alumina or zirconia may be used.

However, in particular, a new anti-resistance alloy containing B in an amount of 3 to 6% by weight in an Fe-based alloy, a Co-based alloy or a Ni-based alloy alone (however, excluding a Ni self-fluxing alloy alone) or a mixed alloy. It is better to use an abrasive material. By using such a wear-resistant material, the durability of the edge member is significantly improved.

As the Fe-based alloy, the Co-based alloy and the Ni-based alloy, those conventionally used for this kind of purpose can be used. Preferably, an alloy containing Fe, Ni, Co and Cr is used. Good to use.

As B added to the above alloy, boron carbide (B ₄ C) is preferably used. The addition amount of B is 3 to
It must be 6% by weight. If the amount is less than this, the effect of increasing the hardness and suppressing the decrease in hardness at a high temperature is not exhibited. If the amount is more than this, the material becomes very brittle, and defects such as cracks and defects are liable to occur.

When the raw material alloy to be mixed contains B, the amount of B added needs to be adjusted so that the content after mixing becomes 3 to 6% by weight.

When carbide particles are mixed with the wear-resistant material containing B, the wear resistance is further improved. As the carbide particles, NbC, TiC, Mo ₂ C, Cr ₃ C ₂ ,
One or more of WC, W ₂ C, VC, TaC and ZrC are preferably used.

FIG. 7 shows an embodiment of the present invention, in which a pair of edge members 1, 1 'of a non-reversing type is provided with abrasion resistant meat at both longitudinal ends thereof which can abut on the road shoulder side. An example in which the fill welding layers 9 and 9 'are formed is shown.

FIG. 8 shows an example in which wear-resistant overlay welding layers 9, 9 and 9 ', 9' are formed at opposite upper and lower ends of a pair of edge members 1, 1 'of a reversing type. . In the above embodiment, the overlay welding layers 9 and 9 and 9 'and 9' are formed above and below the opposing position. By forming in this manner, the build-up welded layer becomes an end that can abut on the road shoulder side due to upside down and left / right interchange.

FIG. 9 shows a pair of reversing-type edge members 1, 1 'formed with wear-resistant overlay welding layers 9, 9 and 9', 9 'at upper and lower ends which can abut the road shoulder side. An example is shown below. In the above embodiment, the overlay welding layers 9 and 9 and 9 'and 9'
Are formed above and below a diagonal position. By forming in this manner, by inverting upside down, the build-up welding layer becomes an end that can abut on the road shoulder side.

In the embodiment shown in FIGS. 7 to 9, the overlay welding layers are formed on both the edge members 1 and 1 '.
This may be one where the wear is particularly severe. If the length 1 of the build-up welding layers 9, 9 'is too long, not only is it not possible to completely wear the grounding blade, but it is not economical, so that the length l of one edge member is one-half (L).
It is better to do the following. As shown in FIG. 10, the portions of the overlay welding layers 9, 9 ′ of the edge members 1, 1 ′ are, as shown in FIG. At least one location is sufficient.

Next, the present invention will be further described with reference to an example in which a wear-resistant material used in the present invention is manufactured and an example in which the wear resistance of the wear-resistant material is tested. (Example 1) A commercially available SUS304, Ni self-fluxing alloy, the powder of the stellite powder and B ₄ C, respectively mixed in the form of a powder, the composition shown in the following Table 1 (Fe-Ni-Co-Cr-based alloy) Alloys B, C and D of the present invention and comparative alloys A and E were produced.

[0025]

Table 1 Composition of various wear-resistant materials (% by weight)

The above alloys A to E are at room temperature and 600 ° C.
And the hardness at 800 ° C. were measured. From this, the difference between the hardness at room temperature and the hardness at 600 ° C. and 800 ° C .: ΔH ₆₀₀ and ΔH ₈₀₀ were calculated, respectively. The results are shown in Table 2 below. For comparison, as an example of the base material, S4
5C (general steel for machine structure) was measured and calculated in the same manner. The results are shown in Table 2 below.

[0027]

[Table 2] Hardness (Hv) of various wear-resistant materials

As is apparent from the above results, B is 3 to 6
By containing by weight, the hardness at normal temperature is improved, and accordingly, the decrease in hardness at high temperature (800 ° C.) can be suppressed. Alloy A containing less than 3% by weight of B has low hardness at room temperature and cannot suppress a decrease in hardness at high temperature. B is 6% by weight
It was observed that the alloy D, which has a higher content, can suppress a decrease in hardness at a high temperature, but becomes very brittle and causes defects such as cracks and defects. From the above, the content of B is
It turns out that 3-6 weight% is optimal.

Example 2 Alloy powder A described in Table 1 above
And B were mixed with 20% by weight of NbC.
The hardness at 00 ° C and 800 ° C was measured. From this, the difference between the hardness at room temperature and the hardness at 600 ° C. and 800 ° C .: ΔH ₆₀₀ and ΔH ₈₀₀ were calculated, respectively.
The results are shown in Table 3 below. For comparison, SKH51 (high-speed tool steel), Ni self-fluxing alloy (Ni-based wear-resistant material) and Stellite # 1 (Co-based wear-resistant material) were similarly measured, and the results were shown in Table 3 below. It was also described in.

[0030]

[Table 3] Hardness (Hv) of various wear-resistant materials

Example 3 Powder 10 of Alloy C shown in Table 1 above
0 parts by weight, 11 parts by weight of NbC and Ti as reinforcing materials
And C15 parts by weight to obtain a cladding material of the present invention.
This overlay material was welded to the base material by plasma powder overlay welding, and a gouging wear test was performed using the base material as a control material. For comparison, a gouging abrasion test was similarly performed on a conventional overlay. The test specimens and their Rockwell hardness (HRC) are as shown in Table 4 below.

[0032]

[Table 4] Hardness of test material (HRC)

The gouging abrasion test was performed under the following conditions.

The abrasion resistance ratio was determined according to the following evaluation method. The results are shown in FIG. Here, the smaller the numerical value of the wear resistance ratio (%), the better the wear resistance.

As is evident from the results shown in FIG. 11, the overlay welded article (1) of the present invention is significantly less likely to wear than the conventional overlay welded article (2).

The Rockwell hardness (HRC) of the test piece after the above gouging abrasion test was measured for the overlay welded article (1) of the present invention and the conventional overlay welded article (2). As a result, the overlay (1) of the present invention did not change from 57 to 57, but the overlay (2) decreased from 62 to 57.

According to the present invention, since the build-up welding is performed only on the portion where the wear is severe, the cutting edge portion of the edge member is uniformly worn in the length direction as a whole, and the durability of the edge member is improved. (Service life) is significantly improved.

Also, as for the wear-resistant material to be subjected to build-up welding, by using the wear-resistant material of the present invention containing a specific amount of B, the hardness of the wear-resistant material and the high temperature Because the hardness does not decrease even when the wear resistance is increased, the edge member obtained by overlay-welding the wear-resistant material of the present invention becomes extremely hard to wear.

[0039]

As described above, the first aspect of the present invention is as follows.
According to the invention described in (1), since the wear resistance of the portion abutting on the road shoulder side is improved, the grounding blade of the edge member wears substantially uniformly in the length direction, so that the edge is compared with the conventional product. Since the life of the member is remarkably improved and only the edge of the edge member is weld-welded, the edge member can be provided at a lower cost as compared with a conventional product in which overlay welding is performed over the entire length.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the effect of significantly improving the wear resistance of the edge member can be obtained.

[0041]

[Brief description of the drawings]

FIG. 1 is a front view, a left side view, and a right side view of a conventional edge member.

FIG. 2 is a front view and a right side view of a conventional edge member.

FIG. 3 is a front view showing a use state of the edge member.

FIG. 4 is a front view and a right side view of an edge member used in the present invention.

FIG. 5 is a front view and a right side view of an edge member used in the present invention.

FIG. 6 is a front view and a right side view of an edge member used in the present invention.

FIG. 7 is a front view showing the embodiment of the present invention.

FIG. 8 is a front view showing another embodiment of the present invention.

FIG. 9 is a front view showing another embodiment of the present invention.

FIG. 10 is a cross-sectional view of a ground blade build-up welding layer of the present invention.

FIG. 11 is a bar graph showing test results of wear resistance of the edge member of the present invention and a conventional edge member.

[Explanation of symbols]

1, 1 'edge member 2, 2' mounting hole 3, 3a, 3a ', 3b, 3b' grounding blade 4 road surface 4a central portion of road surface 4b road shoulder side of road surface 5 sidewalk 7, 7 'end portion of edge member 8 ground Grooves formed on the blade 9,9 'Overlay welding layer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Go Morishima, 5th-9th, Yonbancho, Chiyoda-ku, Tokyo Topy Industries, Ltd.

Claims (8)

[Claims] An abrasion-resistant material is weld-welded to a ground contact blade of an edge member attached to a snow-removing vehicle, and the build-up weld is formed in at least a length direction capable of contacting a road shoulder side of the ground contact blade. An edge member for snow removal formed on at least a part of the outer periphery of one end. 2. The method according to claim 1, wherein the wear-resistant material contains B in an amount of 3 to 6% by weight in an Fe-based alloy, a Co-based alloy, or a Ni-based alloy alone (excluding a Ni self-fluxing alloy alone) or a mixed alloy. 2. The edge member according to claim 1, wherein the edge member is a wear-resistant material whose hardness is increased by suppressing the decrease in hardness at a high temperature. 3. The edge member according to claim 2, wherein said B is added as boron carbide. 4. The method according to claim 1, wherein the wear-resistant material comprises NbC, TiC, M
o ₂ C, Cr ₃ C ₂ , WC, W ₂ C, VC, TaC and Z
4. The edge member according to claim 2, wherein at least one of rC is contained. 5. The edge member according to claim 1, wherein said overlay welding is plasma powder overlay welding. 6. The edge member is provided in plural in the longitudinal direction, and the overlay welding is formed on both or one of the portions of the edge members at both ends which can contact the road shoulder side. Item 6. The edge member according to any one of Items 1 to 5. 7. The length of the welded portion in the length direction is not more than の of the total length of one of the edge members.
The edge member according to any one of claims 6 to 10. 8. The edge member according to claim 1, wherein at least a part of the outer periphery of the end portion is at least one portion before and after a ground contact blade and at a tip contact portion.