JPH079413A - Chipper blade and production thereof - Google Patents

Abstract

PURPOSE:To facilitate the repairing work of a chip blade by constituting a chipper blade of a blade substrate and the chip blade and forming the substrate from prehardened steel and providing the chip blade to the protruding part of the peripheral edge part of the substrate by hardening building-up welding. CONSTITUTION:Gas fusing processing is applied to a prehardened steel panel 1 to obtain a disc-shaped blade substrate 21. Protruding parts 21b are formed to the peripheral edge part of the substrate 21 and a fitting hole 21a is formed to the central part of the substrate and chip blades 22 are formed to the leading ends of the protruding parts 21b by built-up parts 3 using a hardening build-up welding material. Subsequently, the built-up parts 3 are subjected to cutting processing by a grinder to sharpen the chip blades 22. Since the blade substrate is constituted of prehardened steel excellent in fusing properties and weldability and the chip blades are separately provided, large-scale heat treatment equipment is unnecessary and production becomes simple. Even when a blade is broken, the build-up welding or replacing work only of the chip blades 22 can correspond and regenerating and repairing work can be easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wood chips.
The present invention relates to a chipper blade most suitable for a wood chipper that is crushed or cut into pieces and a manufacturing method thereof.

[0002]

2. Description of the Related Art Today, as the use of paper products continues to increase, the demand for chips is increasing, and from the perspective of forest protection, the raw materials used for chip production have not been used so far. It extends to waste materials such as construction waste and packaging boxes.

Under these circumstances, demands for cost reduction and easy repair of chipper blades, which are consumable parts, are increasing, in addition to improving the performance of wood chippers. Conventional chipper blades are hardened steel (JIS SCM
System) is carburized and heat treated, or high carbon steel is heat treated to harden the entire surface of the blade, and the tip blade is sharpened from this, and the size is even weight for even assembly type blade parts. It was a big one reaching several tens of kilograms.
Therefore, large-scale equipment is required for carburizing and heat treatment, and the processing process becomes complicated.
The manufacturing cost of the blade has been high.

Further, in the conventional chipper blade, it is not easy to repair the blade tip edge due to wear or breakage. Since foreign materials such as nails in building waste materials are mixed in various kinds of waste materials, when such waste materials are used as a chip raw material, chipper blade breakage accidents inevitably occur. However, I can't replace expensive chipper blades often,
In order to further promote the effective use of various waste materials, it has been earnestly desired to facilitate the reworking and repairing work of the chipper blade.

[0005]

Technical Problem to be Solved According to the present invention, the conventional chipper blades have been focused on toughness against foreign matter, although the chipper blades are frequently broken due to the use of waste materials. It was made in view of the fact that it was expensive, the chipper blade that can significantly reduce the manufacturing cost, and can also perform repair work against blade spills, etc. It is a technical object to provide a method for manufacturing a blade.

[0006]

SUMMARY OF THE INVENTION The present invention is a chipper blade comprising a blade base body made of pre-hardened steel and having a required shape, and a blade tip blade which is welded to a required portion of the blade base body or detachably attached thereto. The above problem was solved by adopting the technical means of constructing.

Further, in the method of the present invention, a fusing treatment step of obtaining a blade base body of a required shape from a pre-hardened steel sheet by fusing treatment, and a hardfacing welding material at a predetermined portion of the blade base body obtained by the fusing treatment. Perform a build-up welding process using build-up welding to obtain a build-up part, and a tip-blade forming process to grind the build-up part obtained by the build-up processing into a desired cutting edge shape to obtain a blade tip blade. I adopted the technical means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the accompanying drawings. 1 is a simplified explanatory view showing an example of a wood chipper equipped with a chipper blade of the present invention, and FIG. 2 is an overall perspective view illustrating the configuration of the chipper blades of the first to sixth embodiments of the present invention. 3 to 6 are simplified explanatory views showing the manufacturing process of the chipper blade of the first to sixth embodiments of the present invention, and FIG. 7 is an exploded perspective view illustrating the configuration of the chipper blade of the seventh embodiment of the present invention. is there.

FIG. 1 shows a wood chipper C for chipping a wood material W such as various kinds of waste materials. The chipper C is a chipper blade 2.2 of the present invention.
... is attached. Two rotary shafts S, S driven by a motor (not shown) each have a plurality of chipper blades 2, 2, ...
・ 2 ... are fitted together, and the chipper blades 2, 2, ...
The wood material W charged from the upper part is crushed.

The "first to sixth embodiments" of the chipper blade 2 have, as shown in FIG. 2, two protrusions 21b and 21b at the opposite positions of the peripheral edge and a fitting hole 21a at the center. A substantially disk-shaped blade base body 21 and this blade base body
It is composed of the tip blades 22 and 22 welded to the tips of the projections 21b and 21b of 21. The blade base 21 is made of pre-hardened steel (material A, material B; see Table 1) that has been previously heat-treated and has excellent weldability and fusing properties, and the tip blade 22 is a hardfacing weld material. (Material 1 to Material 3; see Table 2) are used.

[0011]

[Table 1]

[0012]

[Table 2]

The pre-hardened steels (material A, material B) and the hardfacing welding materials (materials 1 to 3) have different hardnesses (Vickers hardness) depending on the materials. Each type of chipper blade can be obtained as in the first to sixth embodiments shown in FIG. The optimum chipper blade can be selected according to the properties of various waste materials used as chip materials.

[0014]

[Table 3]

Next, an example of a method for manufacturing the chipper blade of the first to sixth embodiments of the present invention will be described with reference to FIGS.

First, a pre-hardened steel plate having a thickness of about 50 mm indicated by reference numeral 1 was subjected to a normal gas fusing treatment (crater size No. 4; fusing speed 100 mm / min) to give a substantially disc shape (maximum diameter of about 400 mm. The work for obtaining the blade bases 21, 21 ... Protrusions 21b, 21b of each blade base 21
The fusing is performed so as to form the welded portions 21c and 21c shown in FIG.

Next, the welded portions 21c and 21c formed at the tips of the projections 21b and 21b of the blade substrate 21 obtained by the fusion cutting process.
21c is preheated (150-200 ℃), and the hardfacing welding material (diameter 4mm) is used to perform the electric overlay welding (current value 150A) to form the overlay portion 3/3. (See FIG. 5).

Then, the built-up portions 3 and 3 are cut with a disc grinder (grinding stone roughness 80),
The tipper blades 22 and 22 are each sharpened to complete the chipper blade (see FIG. 6).

As described above, in the above-described chipper blades of the first to sixth embodiments, since the blade base body and the blade tip blade made of different materials are joined by welding, for example, nails and the like are used. Even when a large impact force that causes blade breakage due to foreign matter is applied to the chipper blade, in most cases, the blade tip blade part made of hardfacing welding material or the welding of the blade base and the blade tip blade The blade will be broken in some parts. Unlike conventional chipper blades, where the tip blade is formed integrally with the blade base, there are also various breakage occurrence points, in the chipper blade of the present invention,
Repairing the broken part is also extremely easy.

[Seventh Embodiment] A seventh embodiment of the chipper blade is to mechanically join a blade base and a blade tip blade with a bolt. Similar to the first to sixth embodiments, the blade base body is made of pre-hardened steel, and its shape is substantially the same as that of the first to sixth embodiments. However, a mounting portion 23c is formed by cutting a plurality of fixing grooves at the tip of the protruding portion 23b of the blade base (FIG. 7 is an enlarged view of the protruding portion 23b of the blade base).
In addition, the tip blade 24 made of tool steel (JIS SKS-3, SKH-51, etc.) formed in a shape that fits into the mounting portion 23c is detachably fixed by bolts 25 made of high-tensile steel material. There is.

[0021]

As described above with reference to the embodiments, the tipper blade according to the present invention is composed of a pre-hardened steel excellent in fusing property and weldability in a blade base body which tends to be large, and a blade tip. Since the blade is separately provided, a large-scale various heat treatment equipment is not required, and at the same time, the manufacturing process can be simplified and the manufacturing cost can be significantly reduced.

Further, the chipper blade according to the present invention, even if the blade breaks due to the inclusion of foreign matter such as nails, can be dealt with by the overlay welding work of only the blade tip blade or the replacement work of the blade tip blade. As a result, it is easy to regenerate and repair the chipper blade when it is broken or worn.

[Brief description of drawings]

FIG. 1 is a simplified explanatory view showing an example of a wood chipper equipped with a chipper blade according to an embodiment of the present invention.

FIG. 2 is an overall perspective view illustrating a configuration of chipper blades according to first to sixth embodiments.

FIG. 3 is a simplified explanatory view showing the manufacturing process of the chipper blades of the first to sixth embodiments.

FIG. 4 is a simplified explanatory view showing the manufacturing process of the chipper blades of the first to sixth embodiments.

FIG. 5 is a simplified explanatory view showing the manufacturing process of the chipper blades of the first to sixth embodiments.

FIG. 6 is a simplified explanatory view showing the manufacturing process of the chipper blades of the first to sixth embodiments.

FIG. 7 is an exploded perspective view for explaining the configuration of a chipper blade main portion of a seventh embodiment.

[Explanation of symbols]

 1 Pre-hardened steel plate 2 Chipper blade 21 Blade base 21b ・ 23b Projection 22 ・ 24 Blade tip blade 3 Buildup part

Claims (5)

[Claims] 1. A chipper blade for use in a wood chipper for crushing or cutting wood into chips, which comprises a blade tip blade for directly crushing or cutting wood,
Including a blade base supporting the blade tip blade,
A chipper blade, wherein the blade substrate is made of pre-hardened steel. 2. The blade base has a substantially disc shape having at least one protrusion on its peripheral edge, and a blade tip blade made of a hardfacing weld material is welded to the protrusion of the blade base. The chipper blade according to claim 1. 3. The blade base has a substantially disc shape having at least one protrusion on its peripheral edge, and a blade tip blade is detachably provided on the protrusion of the blade base. The described chipper blade. 4. A fusion cutting process for obtaining a blade base body of a required shape from a pre-hardened steel sheet by a fusion cutting process, and a build-up welding using a hardfacing welding material at a required portion of the blade base body obtained by the fusion cutting process. It is characterized by including a build-up treatment step for obtaining a build-up portion by applying Chipper blade manufacturing method. 5. A fusing treatment process for obtaining a substantially disk-shaped blade base body having at least one protrusion portion at a peripheral portion from a pre-hardened steel plate by fusing treatment, and a step for forming the protrusion portion on the blade base body obtained by the fusing treatment. , A build-up treatment process to obtain a build-up portion by carrying out build-up welding using a hardened build-up welding material, and a build-up portion obtained by the build-up treatment is ground into a desired cutting edge shape to obtain a blade tip blade. A method for manufacturing a chipper blade, comprising a tip blade forming step.