JPH1190887A - Rotary blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain cutting quality and improve the abrasion resistance of a rotary blade by covering the back face side of a blade section with an abrasion-resistant metal to form a laminated blade section, and protruding the abrasion-resistant metal to the outer direction of the blade section to form a sharp edge when the blade section is abraded. SOLUTION: The periphery of a blade plate 1a is bent into a doglegged shape toward the surface side, and the surface side of a blade section 5 is cut nearly in parallel with the blade plate 1 a to form an abrasive face 2a. The back face side of the blade section 5 is covered with an abrasion-resistant metal 2b to form a laminated blade section 2 with the steel of the abrasive face 2a and the abrasion-resistant metal 2b. A rotary blade is abraded by repeated cutting over a long period, the abrasive face 2a made of steel of the laminated blade section 2 is inferior in abrasion resistance to the abrasion- resistant metal 2b, the abrasive face 2a is abraded inward from a tip section 4 earlier than the abrasion-resistant metal 2b, and the abrasion-resistant metal 2b is protruded outward against the blade section 2. The cutting quality for cutting straws is maintained, and abrasion resistance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the wear resistance of a rotary blade, particularly a rotary blade attached to a cutter of a combine.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique of cutting rice, wheat, and the like with a combine, threshing, and cutting a waste straw after threshing with a cutter device. A plurality of rotary blades (disk cutters) are fixed in parallel, and the rotary blades have a saw-shaped blade portion formed on the outer periphery of a disk-shaped blade plate. By rotating the rotating shaft of the above, the straw was thrown in during that time to cut the straw, and after the cutting, the straw was released to the field.

[0003]

However, the rotary blade is made of steel, and the blade is hardened by a process such as quenching. However, when a large number of straws are cut, the blade becomes hard. They wear quickly and therefore lose their sharpness, are released without being cut, or cause clogging, resulting in poor working efficiency. If the sharpness decreases, the worn rotary blade must be polished or the rotary blade must be replaced, but all of these operations are very troublesome and costly, so it is desirable to maintain the sharpness as long as possible. is there.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in the rotary blade 1 in which the blade portion 5 is formed on the outer peripheral portion on the front side (one side surface) of the disk-shaped blade plate 1a,
By forming the laminated blade portion 2 by covering the back surface (the other side surface) of the blade portion 5 with the wear-resistant metal 2b, when the blade portion 2a is worn, the wear-resistant metal 2b is Form a sharp edge protruding outward with respect to the blade portion 5 to maintain sharpness,
This is to improve the wear resistance of the rotary blade 1.

Further, the wear-resistant metal 2b is deposited on the back surface of the blade portion 5 by a thermal spray welding method to improve the wear resistance of the rotary blade 1.

[0006]

Embodiments of the present invention will be described.
FIG. 1 is an overall front view of the rotary blade of the present invention, FIG. 2 is an overall rear view of the rotary blade of the present invention, FIG. 3 is a partially enlarged view of FIG. 2, FIG. FIG. 5 is a sectional view showing a state in which the blade portion 5 of FIG. 4 is worn.

Referring to FIGS. 1, 2 and 3, a rotary blade 1 according to the present invention will be described. The rotary blade 1 is mounted in parallel on a rotating shaft of a combine cutter device, and in the combine, cuts a lower part of a grain culm in a field, transports it to a threshing unit, threshes, and removes a straw after threshing. The cutting is performed by the rotation of the rotary blade. The rotary blade 1 has a polygonal (hexagonal in this embodiment) mounting hole 1b for mounting on a rotary shaft of a cutter device at the center of a disk-shaped blade plate 1a. Is formed with a saw blade-shaped blade portion 5,
By rotating the blade plate 1 a, the straw is cut by the blade portion 5. The blade portion 5 is composed of oblique straight portions 3, 3... And cutting edge blade bottom portions R, 4,... And is formed of a relatively hard base material such as steel.

Then, the periphery of the blade plate 1a is bent toward the front side as shown in FIG. 4 in a "-" shape, and the front side of the blade portion 5 is cut substantially in parallel with the blade plate 1a. 2a. The back surface side of the blade portion 5 is covered with a wear-resistant metal 2b, and the steel on the polished surface 2a and the wear-resistant metal 2b constitute a laminated blade portion 2. The abrasion-resistant metal 2b is deposited on the back side of the blade portion 5 by a thermal spray welding method (metal fuse coating) capable of providing a high-density and high-strength coating, and then heated again at 1050 to 1100 ° C. Dissolves to form a dense and hard film.

The wear-resistant metal 2b is composed of Ni, Cr,
A low melting point self-fluxing nickel alloy containing B and Si as main components, and a fine and high-hardness compound, specifically, NiB2, Cr
It is a dense and hard film in which B, Cr23C6 and the like are uniformly dispersed in the matrix, and has excellent wear resistance. As other examples, it can also be constituted by a cobalt-based self-fluxing alloy or a tungsten carbide self-fluxing alloy,
These self-fluxing alloys are able to withstand severe conditions where corrosion and wear occur at high temperatures.

The hardness required for the wear-resistant metal 2b is a Rockwell hardness when a test is performed using a diamond conical indenter having a vertex angle of 120 ° and a tip radius of 0.2 mm. Those having 55 to 60 are preferred.

Next, the laminated blade portion 2 of the rotary blade 1 will be described with reference to FIGS. An operation of cutting the waste straw with the rotary blade 1 is performed by a combine cutter device having the rotary blade 1, but when cutting is repeated for a long period of time, the rotary blade 1 is worn, and the laminated blade portion 2 is turned from the state of FIG. The state changes to 5. In other words, the polished surface 2a made of steel or the like is inferior in wear resistance as compared with the wear-resistant metal 2b. Wears out. Therefore, as shown in FIG. 4, the wear-resistant metal 2b gradually projects outward with respect to the blade portion 2a. When the front and back surfaces of the rotary blade 1 are treated by quenching or the like and coated with a wear-resistant metal 2b as in the conventional case, the blade edge bottoms R, 4,. The mountain parts are worn and become almost circular, resulting in poor sharpness. In particular, wear is further accelerated unless covered with the wear-resistant metal 2b.

In this manner, the laminated blade portion 2 has a state in which the wear-resistant metal 2b projects even if the polished surface 2a made of steel is worn, so that the function of cutting straw (sharpness) is maintained. As a result, abrasion resistance can be improved. In addition, by improving the wear resistance of the rotary blade 1, the number of replacements of the rotary blade can be reduced, and therefore, the polishing operation time can be reduced, and the harvesting and harvesting operation by the combine can be effectively performed. It becomes.

[0013]

As described above, the present invention has the following advantages. That is, in the rotary blade 1 provided with the blade portion 5 on the outer peripheral portion on the front side of the blade plate 1a, the back side of the blade portion 5 is coated with a wear-resistant metal to form the laminated blade portion 2, The wear resistance of the rotary blade 1 could be improved.

Since the abrasion-resistant metal 2b is welded to the back surface of the blade portion 5 by a thermal spray welding method, the surface of the blade 2 wears quickly after cutting by a cutter device. The wear-resistant metal 2b can remain and create sharp edges, and the remaining wear-resistant metal 2b
Has a high hardness, and the rotary blade 1 does not lose its sharpness over a long period of time, so that the cutting performance can be maintained for a long time.
In addition, by improving wear resistance and durability,
The number of times the rotary blade needs to be replaced can be reduced, and the cutting operation can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an overall front view of a rotary blade according to the present invention.

FIG. 2 is an overall rear view of the rotary blade of the present invention.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view showing a state in which the blade portion 5 of FIG. 4 is worn.

[Explanation of symbols]

 Reference Signs List 1 rotary blade 1a blade plate 2b wear-resistant metal 5 blade portion

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Imoto 657, Kobayashi, Bessho-cho, Miki-shi, Hyogo Prefecture Inside Imoto Co., Ltd. (72) Yukio Terada 200, Asakura, Yoka-cho, Yabu-gun, Hyogo Pref.

Claims (2)

[Claims] 1. A rotary blade having a blade portion formed on the outer periphery of a disk-shaped blade plate, wherein one side surface of the blade portion is coated with a wear-resistant metal. 2. The blade according to claim 1, wherein said wear-resistant metal is welded to one side surface of said blade portion by a thermal spray welding method.
The rotary blade as described.