JP2000218447A - Manufacturing of cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the abrasion of grinding and cutting tools by shaping a material obtained by slitting band steel with a predetermined width and having a condition of low working resistance before the quenching/tempering heating process, with small margin after the quenching/tempering heating process by the fabrication, and then executing the quenching/tempering heating process thereto. SOLUTION: A conveyed band steel is longitudinally slitted by a cutting machine 1 to prepare a plurality of pieces of materials W of a desired width. Then the edging work is executed on the slitted material W by an edging machine 2 to provide one side edge of the material W to be used as a cutting edge, with an edge. This edging work is executed on the material W in a condition of small cutting resistance before the quenching/tempering heating process. Thereby the cutting margin after the quenching/tempering heating process can be reduced. Then the edged material W is quenched/tempered through the heating furnaces 5, 6. Then the quenched/tempered material W is ground and bent for a cutting edge by a grinding and bending machine 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a knife-edge-shaped blade such as a cutter or a blade.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing this kind of knife,
The one which goes through the process as shown in FIG. 5 is known. In the figure, the lower diagram shows a schematic device diagram of the process, and the upper diagram shows a cross-sectional shape of the material. That is, in the conventional process, the conveyed steel strip is first slit by the cutting machine 21 in the longitudinal direction, and a plurality of materials W having a predetermined width are cut.
(FIG. 5A). Next, press 22
Press to form a line for bending and folding on the surface of the material (FIG. 5B). Next, quenching and tempering are performed through heat treatment furnaces 23 and 24 (FIG. 5C).
At 25, the blade is polished and bent and folded (FIG. 5D), whereby a bladed blade having a cross-sectional shape as shown in the upper diagram of FIG. 5D can be obtained. In the above, the press working is optional, and may be omitted if necessary.

[0003] In the case of the above-mentioned conventional manufacturing method, the cutting material (W) slit from the steel strip is subjected to cutting (polishing) from a high hardness state of quenching and tempering. There has been a problem that the resistance is increased and the amount of wear of a grindstone or a cutting tool used for blade polishing or the like is extremely large.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned conventional problems, and can reduce the amount of wear of a grindstone / cutting tool and reduce the number of uses thereof. The purpose is to provide.

[0005]

In order to achieve the above object, the invention of claim 1 is to form a material which is slit from a steel strip to a predetermined width and has a small working resistance before quenching / tempering heat treatment. It is characterized by forming by processing so as to reduce the processing allowance after quenching and tempering heat treatment, and thereafter performing quenching and tempering heat treatment.

According to a second aspect of the present invention, in the first aspect, the forming process is a cutting process. In this case, grinding and plastic working may be performed together with the cutting work. According to a third aspect of the present invention, in the first aspect, the forming process is a press working.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIGS. 1A, 1B, 1C, and 1D are drawings corresponding to conventional FIGS. 5A, 5B, 5C, and 5D.
As is apparent from this correspondence, a significant difference from the conventional technique is that the slit material W is cut before the quenching / tempering heat treatment. In FIG. 1, as in the conventional case, the lower part shows a schematic device diagram of the process, and the upper part shows the cross-sectional shape of the material.

As shown in FIG. 1 (A), first, a strip is conveyed by a cutting machine 1 in the longitudinal direction of the conveyed steel strip to obtain a plurality of materials W having a predetermined width. This step is the same as the conventional one. Next, as shown in FIG. 1 (B), an edge processing machine 2 as shown in FIG.
To give an edge to one side edge of the material W, which is a portion to be a cutting edge. This edging is performed on the material W having a small cutting resistance before quenching / tempering heat treatment. This makes it possible to reduce the cutting allowance after the quenching / tempering heat treatment, which is significantly different from the conventional process. The edge processing machines 2 are installed on both sides in the transport direction of the material W, one of which is formed on the edge processing section 3 and the other is formed on the guide section 4. As shown in FIG. 3, the cross-sectional shape of one side edge of the material W having the edge is such that a slightly round surface Wa is formed at the edge, and an extension line X extending horizontally from the center of the surface and a double curved slope. The angle between the lines Y ₁ and Y ₂ connecting to the surface is a predetermined angle θa ° (a sharp angle).

Next, the material W which has been edge-processed as described above is used.
Then, quenching and tempering are performed through heat treatment furnaces 5 and 6, as shown in FIG. This step is the same as the conventional one. Next, as shown in FIG. 1 (D), the material W after quenching / tempering is subjected to blade polishing / bending / folding by a blade polishing / bending / folding machine 7. This step is basically the same as the conventional one,
The blade polishing refers to further cutting and polishing one side edge of the edge-processed material W, and the bending / folding refers to cutting the material W at a predetermined width in the transport direction. At the time of this cutting, if a line for bending and folding is previously cut on the surface of the material by press working as in the related art, the cutting operation is further facilitated. Therefore, although not shown, a step of pressing the material W after the edge processing may be provided in the same manner as in the related art. As shown in FIG. 4, the cross-sectional shape of one side edge of the material W that has been sharpened and bent is formed into a sharp point Wb with a sharp edge, and an extended line X extending horizontally from the point and both inclined surfaces. the angle between the line Y _3, Y ₄ connecting the door and has a predetermined angle .theta.b ° (an acute angle). This angle θb ° is smaller than or approximately equal to the angle θa °. As described above, one cycle of the manufacturing is completed.
Thus, a bladed tool having a cross-sectional shape as shown in FIG.

The various apparatuses for the process shown in the drawings of this embodiment are listed as preferred apparatuses as an outline, and are not limited to these apparatuses. Also,
FIGS. 3 and 4 showing the cross-sectional shape of one side edge of the material W after the edge processing, the blade polishing, and the bending / folding processing are also examples, and are not limited to these shapes. Needless to say. Further, the edge processing is described only as an example of the cutting step, and any other cutting step may be performed, and the polishing processing and the plastic processing may be performed together with the cutting processing.

[0011]

According to the first to third aspects of the present invention, as described above, a material having a small working resistance before quenching and tempering heat treatment, which is slit into a predetermined width from a steel strip, is formed by quenching. Forming to reduce the processing allowance after quenching and tempering heat treatment, and then performing quenching and tempering heat treatment, so the processing allowance after quenching and tempering heat treatment can be reduced, and as a result it was not possible conventionally This makes it possible to reduce the amount of wear of the grinding wheel / cutting tool, and has an excellent effect that the number of uses can be reduced.

[Brief description of the drawings]

FIGS. 1A, 1B, 1C, and 1D are diagrams showing an apparatus according to an embodiment of the present invention and a sectional shape of a material.

FIG. 2 is a perspective view of the edge processing machine showing an enlarged part II in FIG. 1 (B).

FIG. 3 is a cross-sectional view illustrating a cross-sectional shape of one side edge of the edge-processed material.

FIG. 4 is a drawing showing a cross-sectional shape of one side edge of a material which has been subjected to blade polishing, bending and bending.

5 (A), (B), (C), and (D) are drawings showing a conventional apparatus and a sectional shape of a material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting machine 2 Edge processing machine 3 Edge processing part 4 Guide part 5,6 Heat treatment furnace 7 Blade sharpening / bending machine W Material

Claims (3)

[Claims] 1. A method in which a material having a small working resistance before quenching / tempering heat treatment is slit from a steel strip to a predetermined width so as to reduce the machining allowance after quenching / tempering heat treatment. And then performing a quenching and tempering heat treatment. 2. The method according to claim 1, wherein the forming is a cutting. 3. The method according to claim 1, wherein the forming is press working.
A method for manufacturing the knife according to the above.