JPH05293797A - Processing method for knife - Google Patents

Abstract

PURPOSE:To facilitate regulation of a blade height based on a knife holding bed by a method wherein a cutting work is applied in an arcuate shape alternately on the two surfaces of a back part and the back part is formed in a thin waveform shape in a longitudinal direction. CONSTITUTION:In processing of a knife B for blanking a long sheet-form sheet securely fitted in a knife fit-in groove formed in a knife holding bed, a cutting work is applied in an arcuate shape in a longitudinal direction on a cutting mechanism on the two surfaces, in the direction of the thickness of the knife B, of the knife B. Thereafter, the back part 8 is formed in a which waveform shape in the longitudinal direction thereof. This method simplifies regulation of a blade height based on the knife holding bed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-walled, band-shaped sheet punching knife (hereinafter referred to as a knife) used for punching a sheet of paper, plastic, corrugated board or the like into a predetermined shape by punching and pressing. It is about the method.

[0002]

BACKGROUND OF THE INVENTION As shown in FIGS. 6 and 7, for example, a conventional knife A of this type has a thin wall (for example, a wall thickness dimension of 0.4 to
1.0 mm), it has a band shape, has a cutting edge 1, and has a substantially rectangular cross section. The knife A is used by being fitted and fixed in the knife fitting groove 3 which is formed through the wooden knife holder 2 continuously. The knife fitting groove 3 is formed in a predetermined shape (a shape corresponding to a punching die) in advance by a saw or laser processing, and particularly when formed by the laser processing which has been popular recently, it has a complicated shape. While it can be processed, the width dimension of the back side of the knife insertion groove 3 varies, and when the knife A is inserted into the knife insertion groove 3 in that state, the knife holder 2 is warped. Therefore, after laser processing, finish processing is performed by the router. The knife holder 2 to which the knife A is fixed includes a thin iron plate 11 and a sheet 10 made of paper.
It is mounted on a punching press (not shown) together with the back plate 4, and in this case, there is an error in the blade height dimension h of the knife A and the knife when the knife A is fitted into the knife fitting groove 3 Since the blade height dimension h slightly changes at the bent portion 5 of A, the operator performs the blade height adjustment work before performing the punching press working. In the adjustment work, while performing the test punching, a high-low paper such as a tape 7 is attached between the thin iron plate 11 and the back plate 4 at a position where the blade height dimension h of the knife A is low (see FIG. 7), By bending the thin iron plate 11 in the portion corresponding to the back surface 6,
The error of the blade height dimension h can be absorbed. However, the above-mentioned adjustment work has problems that it requires highly skilled and sophisticated techniques and is very complicated. Therefore,
In recent years, as a knife having a structure capable of improving the ease of adjusting the height of the blade with respect to the knife holder and preventing the lowering of the holding power of the knife holder with respect to the knife, for example, Japanese Patent Laid-Open No. 6-242242.
The one disclosed in JP-A-3-312099 is proposed. The knife disclosed in the above publication has a thin back portion and is repeatedly bent in its thickness direction. The conventional technology for providing such a knife has only proposed a configuration relating to its characteristic shape, but has not yet provided a concrete and rational processing method.
Therefore, the present invention has been devised in view of the above circumstances, and has a knife structure that can improve the ease of adjusting the blade height dimension with respect to the knife holder and prevent the lowering of the holding force of the knife holder with respect to the knife. The purpose is to provide a processing method of.

[0003]

In order to achieve the above-mentioned object, the first means adopted by the present invention is, as its gist, a long length fitted and fixed in a knife fitting groove formed in a knife holder. In the method for processing a knife for punching a thin sheet, in the longitudinal direction of the knife, arc-shaped cutting is alternately performed by a cutting mechanism from both sides of the back in the thickness direction of the knife, and the back is cut. Is a method of processing a knife according to the point that the is formed into a thin wave shape in the longitudinal direction. Furthermore, in order to achieve the above purpose,
A second means adopted by the present invention is, in the gist thereof, in a method for processing a knife for punching a sheet of a long thin plate which is fitted and fixed in a knife fitting groove formed in a knife holder, and has a surface. A knife according to the point that the back of the knife is continuously passed between at least one or more pairs of rollers having appropriate concavo-convex portions to forge the back so as to form a thin wave shape in the longitudinal direction thereof. It is the processing method of.

[0004]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention. here,
FIG. 1 is an explanatory view showing a method of processing a knife according to an embodiment of the present invention, FIG. 2 shows a structure of a knife formed by carrying out the above-mentioned processing method, and (A) is a perspective view. , (B) are sectional views taken along line FF ′ in (A), and FIG.
FIG. 4 is a side sectional view of the knife mounted on the knife holder, FIG. 4 is an explanatory view showing a method for processing a knife according to another embodiment of the present invention, and FIG. 5 is a processing method according to the other embodiment. The structure of the knife formed by carrying out is carried out, (A) is a perspective view, (B) is E in (A).
FIG. The same reference numerals are used for elements common to the conventional knife A shown in FIGS. 6 and 7, and detailed description thereof will be omitted. As shown in FIGS. 2 (A) and 2 (B), the knife B according to this embodiment has a back portion 8 formed into a thin wall of a substantially tapered shape, further having a thickness t (see FIG. 1) in the thickness direction thereof. It is configured by being repeatedly formed into a wavy shape within the range. As shown in FIG. 1, the corrugated shape is cut in a circular arc shape by the end mills 12 and 13 alternately from both sides of the back portion 8 in the thickness direction toward the longitudinal direction of the long thin plate-shaped knife material 9. It is molded by applying. in this case,
The knife material 9 is fed in the direction indicated by the arrow, and the end mills 12 and 13 are moved from the direction perpendicular to or parallel to the paper surface in the figure toward the spine 8 side of the knife material 9 as appropriate. Both sides of the back portion 8 are cut at intervals of. In the knife B formed as described above, when the knife B is fitted into the knife fitting groove 3 formed in the knife holding base 2 (see FIG. 6), the protrusion of the back portion 8 formed in a corrugated shape is formed. The contact side of the knife B with the side wall of the knife fitting groove 3 and the spring property generated by the corrugated shape can ensure a sufficient contact area between the knife B and the side wall of the knife fitting groove 3. .. As a result, the holding force of the knife holder 2 for the knife B is increased.

Further, since the back portion 8 of the knife B is formed in a corrugated shape so as to have a spring property, the knife insertion groove 3 having a non-uniform width dimension immediately after being formed through the knife holder 2 by laser machining. Even when the knife B is fitted, the back portion 8 is flexibly fitted along the knife fitting groove 3 having the uneven width dimension, or the back portion 8 of the side wall of the knife fitting groove 3 is fitted. Since the contact portion partially bends due to the stress acting on the contact portion, it is possible to omit the finishing process by the router after the laser processing. Then, the knife holder 2 (see FIG. 3) having the knife B fitted and fixed in the knife fitting groove 3 is attached to the thin iron plate 1
1, when the blade height dimension h of the knife B is adjusted by mounting it on a punching press (not shown) together with the sheet 10 and the back plate 4,
By performing the test punching, the back portion 8 corresponding to a portion having a high blade height dimension h of the knife B is pressed by the thin iron plate 11 and easily compressed, and the blade height dimension h is automatically and uniformly adjusted. . Therefore, when the worker adjusts the blade height dimension h of the knife B, no advanced technique is required,
It can be carried out easily. In the method of processing the knife C (see FIG. 5) according to another embodiment shown in FIG. 4, the spine 8 of the knife material 9 is continuously passed between a plurality of roller pairs 14 having appropriate irregularities on the surface. By forging
The back 8 is configured to have a thin wave shape in the longitudinal direction. In this case, the roller pair 14
The size of the uneven portion in the above is set so as to be gradually increased toward the downstream side of the knife material 9 in the conveying direction (arrow direction), and if the knife material 9 can be smoothly conveyed and processed. It is tight. Depending on the degree of the corrugation on the back portion 8 or the thickness of the knife material 9, one pair of the rollers 14 is provided so that the corrugation is formed in one step. May be. Further, when carrying out the processing method, the back portion 8 of the knife material 9 may be formed in a thin taper shape in advance in the longitudinal direction by cutting with an end mill or forging with a flat roller.

[0006]

Since the method for processing a knife according to the present invention is configured as described above, by carrying out this processing method, the convenience of adjusting the blade height with respect to the knife holder can be improved and the knife holding can be improved. It is possible to preferably form a knife having a structure capable of preventing a reduction in the holding force of the table with respect to the knife.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a knife processing method according to an embodiment of the present invention.

FIG. 2 shows a structure of a knife formed by carrying out the above-described processing method, in which (A) is a perspective view,
(B) is a sectional view taken along the line FF ′ in (A).

FIG. 3 is a side sectional view of the knife mounted on the knife holder.

FIG. 4 is an explanatory diagram showing a knife processing method according to another embodiment of the present invention.

FIG. 5 shows a structure of a knife formed by performing a processing method according to another embodiment,
(A) is a perspective view, (B) is a plan view taken in the direction of arrow E in (A).

FIG. 6 is a perspective view for explaining the background art of the present invention and showing a state before a knife is attached to the knife holder.

7 is a view showing a conventional knife and is equivalent to FIG.

[Explanation of symbols]

2 ... Knife holder 3 ... Knife insertion groove 8 ... Back part 9 ... Knife material 12, 13 ... End mill 14 ... Roller pair B, C ... Knife

Claims (4)

[Claims] 1. A method for processing a knife for punching a sheet of a long thin plate which is fitted and fixed in a knife fitting groove formed in a knife holder, in the thickness direction of the knife in the longitudinal direction of the knife. A method of machining a knife, wherein arc-shaped cutting is alternately performed from both sides of the back by a cutting mechanism to form the back into a thin corrugated shape in the longitudinal direction. 2. A method of processing a long thin plate-shaped knife for punching a sheet, which is fitted and fixed in a knife fitting groove formed in a knife holding table, wherein at least one set of rollers having an appropriate uneven portion on the surface is used. A method of processing a knife, wherein the back portion of the knife is continuously passed between the pair for forging to form the back portion in a thin wave shape in the longitudinal direction. 3. The method of processing a knife according to claim 2, wherein the back portion is formed thin in advance in a longitudinal direction by a cutting mechanism. 4. The thin portion is formed in advance by forging with a roller in the longitudinal direction of the back portion.
The method of processing a knife according to.