JPS5916721B2 - How to manufacture tiller blades - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a tiller blade that is fixed to the rotating shaft of a tiller and used to dig up the ground surface.

Generally, in a tiller, a large number of tilling blades are fixed to a rotating shaft provided horizontally in a direction perpendicular to the direction of travel, and the work of digging up the ground surface is carried out.

Conventionally, this tilling blade is made of steel plate and hardened by quenching before use, but the blade tip is subject to severe wear as it excavates earth and sand, and the tilling blade has to be replaced frequently, making maintenance difficult. It was expensive.

Another option is to thermally spray and weld an ultra-hard metal material onto one surface of the cutting edge, but since the base material is curved into the shape of a tiller blade and then welded, the welding material may flow around the curved part of the base material. The welding thickness becomes thinner, the thickness of the welding material at the cutting edge becomes unbalanced, and there is a risk that the welding material may peel off during use.

On the other hand, if an ultra-hard metal material is welded to a base material and then the base material is curved, the ultra-hard metal material may crack or peel.

The present invention eliminates the above-mentioned drawbacks and improves durability by providing a large number of grooves in parallel on the surface of the cutting edge in a direction that intersects with the cutting edge, and by embedding an ultra-hard hard member in these grooves. To provide a method for manufacturing a tiller blade that can obtain a tiller blade with a certain degree of strength at a low cost.

Hereinafter, one embodiment of the present invention will be described using the drawings.

As shown in FIG. 1, 1 is an engine mounted on the frame 3 of the tiller, 5 is a drive wheel, 1 is a bundle, and 9 is a support frame 11 fixed to the front end of the frame 3, perpendicular to the direction of movement. a rotating shaft rotatably supported in the direction of rotation, 13, 13.
. . . are tilling blades fixed to the rotating shaft 9, and a plurality of tilling blades are arranged in parallel at positions sequentially rotated in the axial direction.

15 is a sprocket that is fixed to the rotating shaft 9, and is connected to the engine 1.
from the sprocket 19 fixed to the take-out shaft 17 of the chino 2
Power is transmitted via 1.

As shown in FIGS. 2 to 6, the tiller blade 13 has a main body 23 formed by punching out a steel plate, and a cutting edge portion 25 is formed at the tip end thereof.

On the surface of the cutting edge part 25, when the main body 25 is in a flat state before being curved as shown in FIG.・
are arranged in parallel, and the groove portions 29.29. . . . Inside is a hard member 3L31 made of ultra-hard metal or the like. . . . is buried by welding metalwork, etc.

After that, the main body 23 is curved into the shape of a tiller blade as shown in FIG.

In the above configuration, when the tiller is moved forward by the drive wheel 5, the power of the engine 1 rotates the rotary shaft 9 via the take-out shaft 17, the sprocket 19, the chino 21, and the sprocket 15, and is fixed to the rotary shaft 9. Cultivating blade 13, 13
．． It involves digging up the ground surface and cultivating it.

The hardness and strength of the cutting edge portion 25 of the tilling blade 13 are protected by the thick hard member 31 embedded in the groove portion 29, so that the life span is significantly extended and there is no possibility of peeling off.

Note that the groove portions 29, 29.・・・・・・ is the cutting edge part 2
It may be provided on either the front side or the back side of 5, or it may be provided on both the front and back surfaces.

Further, FIGS. 7 to 9 show the cutting edge part 25 of another tilling claw formed by the above method, in which the depth of the groove part 31 is set to become deeper as it approaches the cutting edge 27. It is.

As described above, in the present invention, a large number of grooves provided in a direction intersecting the edge of the blade are arranged in parallel on the surface of the cutting edge of a main body before bending formed of a steel plate, and an ultra-high-quality hard member is placed in the grooves. This is a method of manufacturing a tiller blade in which the main body is curved into the shape of a tiller blade after embedding the main body, so that it has the following effects.

That is, since the main body is curved into a tiller blade shape after embedding the ultra-hard hard member, the hard member can be buried reliably and uniformly, and processing is extremely easy.

At the same time, since the hard member is buried in a large number of grooves provided in a direction intersecting the edge of the blade, the hard member will not peel off even if the main body is bent after being buried.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well.

[Brief explanation of drawings]

Fig. 1 is a side explanatory view of a tiller equipped with a tilling blade according to the present invention, Fig. 2 is a plan explanatory view of the tilling blade, Fig. 3 is a front explanatory view of the same, Figs. The figures are a front sectional view, a side sectional view, and a plan view of the main parts, and FIGS. 7, 8, and 9 are a front sectional view, a side sectional view, and a plan view of the main parts, respectively. Explanation of the symbols representing the main parts of the drawing, 23...
- Main body, 25...Blade tip portion, 27...Blade edge edge, 29...Groove portion, 31...Hard member.

Claims (1)

[Claims] 1. A large number of grooves 2 provided on the surface of the cutting edge portion 25 of the main body 23 before bending formed of a steel plate in a direction intersecting the cutting edge edge 27.
9,29. . . are arranged in parallel, a super hard hard member 31 is buried in the groove portion 29, and then the main body 23 is curved into the shape of a tiller blade.