JP2003300198A - Trimming die for punching work and method of manufacturing cutting blade for punching work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trimming die for punching work having a cutting blade, easy in working, and capable of reducing cost, and a manufacturing method of the cutting blade for punching work. <P>SOLUTION: In this trimming die 10 for punching work, the cutting blade 12 for punching a sheet material 700 and a line 13 for forming a ruled line on the sheet material 700 are fixed to a baseplate 11. A blade part 12a of the cutting blade 12 is refined on a surface by shot blast processing. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching die used for punching a sheet material into a predetermined shape and a method for manufacturing a cutting blade for punching.

[0002]

2. Description of the Related Art Conventionally, a punching machine has been used to punch a punched piece having a predetermined shape such as a developed box from a sheet material such as a synthetic resin film, thin paper or thick paper. A conventional punching machine is composed of a die and a face plate facing the die, and punches the sheet material by pressing the die on the face plate on which the sheet material is placed.

FIG. 9 is a schematic sectional view of a main part of a die and a face plate portion in a conventional die cutting machine, and FIG. 10 shows a punching piece for a box punched by the die cutting machine.

As shown in FIG. 9, the punching machine has an upper surface plate 1
00 and a lower slider 200, and an upper surface plate 100
Attached to the chase 300 and the lower slider 20
It has a dead plate 400 attached to zero.
Here, the chase 300 is one of general-purpose jigs that is accurately positioned and fixed to the upper surface plate 100 of the punching machine, and the dead plate 400 is one of general-purpose jigs that is accurately positioned and fixed to the lower slider 200. Is one.

A die 50 fixed to the upper surface plate 100
0 is a cutting blade 502 and a ruled line 503 on a die board 501.
Is fixed. The die board 501 is usually made of a veneer plate, a resin plate or a metal plate.
A fixed groove 504 is generally formed in 01 by laser processing. On the other hand, the cutting blade 502 and the ruled line 503 are formed by cutting a strip-shaped plate material into a predetermined length and then bending it.
It is inserted and fixed in a fixing groove 504 formed in the die board 501.

On the other hand, the counter plate 600 which is fixed on the dead plate 400 and serves as a face plate has about 1 to 1.5.
It is made of a metal plate material having a thickness of mm, a groove 601 is formed in a portion corresponding to the ruled line 503, and a flat receiving surface 602 is formed in the other portions.

In such a punching machine, a sheet material 700 such as a synthetic resin film, thin paper, or thick paper is placed on the counter plate 600, and the lower slider 200 is lifted from below to be placed on the receiving surface 602 of the counter plate 600. Cutting blade 5
By pressing 02, the sheet material 700 can be punched into a desired shape.

An example of the punched piece formed in this way is shown in FIG.
0 is shown. The punching piece 701 has a desired shape, and at the same time, has a cutting line 702 and a ruled line (folding line) 703 to be a fold line at a desired position. Here, the cutting line 702 is formed by the tip of the cutting blade 502 contacting the receiving surface 602 of the counter plate 600, and the ruled line 703 is the groove 601 in which the tip of the ruled line 503 is formed.
It is formed by being inserted inside.

[0009]

The cutting blade used for the above-mentioned die-cutting is generally formed by using a band-shaped material having a very high hardness (around HRC 50 °) such as a high hardness stainless steel plate. Therefore, there is a problem that it takes much time and labor to cut the cutting blade into a predetermined length and to bend the cutting blade into a predetermined shape. In particular, when such a cutting blade is bent, there is spring back, and therefore when it is bent by a machine, it is necessary to make a correction in consideration of the degree of spring back according to the material, which makes the work very complicated.

Further, when the punching process is continued, there is a problem that the tip of the cutting blade is crushed and burrs are generated. Since cutting quality deteriorates extremely when burr appears in this way, it is practiced to scrape the burr of the blade with a cutter knife, but not only the work is difficult, but the cutting quality cannot be improved sufficiently. There was a problem.

In view of such circumstances, it is an object of the present invention to provide a die for punching and a method for manufacturing a cutting blade for punching, which can be easily machined and can reduce the cost.

[0012]

According to a first aspect of the present invention for solving the above problems, a cutting blade for punching a sheet material and a rule for forming a ruled line on the sheet material are fixed to a base plate. A punching die for punching, wherein the blade portion of the cutting blade is subjected to surface modification by shot blasting.

According to a second aspect of the present invention, in the first aspect, the cutting blade is formed by bending a strip-shaped thin steel sheet having the blade portion, and is shot-blasted after being fixed to the base plate. It is a die for punching, which is characterized by being a thing.

A third aspect of the present invention is the die for punching according to the first or second aspect, characterized in that the surface modification process is performed only in the vicinity of the blade portion of the cutting blade. is there.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the cross-sectional shape of the tip of the surface-modified blade portion is such that a substantially central portion in the thickness direction protrudes. It is a die for punching, which is characterized by a convex curved surface.

A fifth aspect of the present invention is a method of manufacturing a punching cutting blade for punching a sheet material, wherein the blade portion of the unused or unused cutting blade is surface-modified by shot blasting. A method of manufacturing a cutting blade for punching, which is characterized by processing.

A sixth aspect of the present invention is the production of a cutting blade for punching according to the fifth aspect, characterized in that the surface modification processing is performed only in the vicinity of the blade portion of the cutting blade. On the way.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the cross-sectional shape of the tip of the blade portion subjected to the surface modification processing is a convex curved surface with a substantially central portion protruding in the thickness direction. And a method of manufacturing a cutting blade for punching.

An eighth aspect of the present invention is characterized in that, in any one of the fifth to seventh aspects, a shot blasting process is performed after the cutting blade is fixed to a die-cutting base plate. It is in a manufacturing method of a cutting blade for punching.

A ninth aspect of the present invention is the punching process according to the eighth aspect, characterized in that the shot blasting process is performed using CAD data for forming a mounting groove of the cutting blade of the die. There is a manufacturing method of a cutting blade for use.

A tenth aspect of the present invention is the cutting for punching according to any one of the fifth to ninth aspects, characterized in that the surface modification is performed on a cutting blade after use. It is in the manufacturing method of the blade.

In an eleventh aspect of the present invention, in any one of the fifth to tenth aspects, the surface modification process is performed by arranging a shot blast nozzle at a substantially central portion in a thickness direction toward a tip of the blade portion. A method of manufacturing a cutting blade for punching, which is characterized in that

In a twelfth aspect of the present invention according to any one of the fifth to tenth aspects, the surface modification treatment is performed by using two or more shot blast nozzles in a thickness direction toward a tip of the blade portion. A method for manufacturing a cutting blade for punching is characterized in that the cutting blades are arranged in parallel.

As described above, according to the present invention, in the case where the blade portion of the cutting blade is surface-modified by shot blasting, the cross-sectional shape of the tip of the blade portion becomes a substantially convex curved surface, and the cutting is performed from the initial stage of punching. Quality can be secured, burrs are less likely to occur even if used for a long time, durability is improved, and the material of the cutting blade is not so high in hardness and easy to process. This is based on the new idea that there is also an advantage that high hardness can be secured only in the blade portion by performing shot blasting only on the portion. In addition, by similarly performing shot blasting on the cutting blade whose cutting quality after use has deteriorated,
It was also found that the cutting quality can be improved.

Therefore, the material of the cutting blade of the present invention may be any material that can be surface-modified by shot blasting. Not only general cutting blade materials but also low hardness thin steel plates that cannot be used conventionally are used. You can Further, the thickness of the thin steel plate may be the same as the thickness of a conventional general cutting blade,
Generally, it is about 0.5 mm to 3 mm.

In the present invention, the method of forming the blade portion of the cutting blade is not particularly limited, and for example, it may be formed by cutting or forging. In the case of cutting, it may be processed after quenching as a whole. In this case, after processing, annealing may be performed, and only the blade portion may be quenched by laser irradiation as described above.
Further, it may be as-quenched or annealed to some extent, and as a result, may be slightly annealed as a whole as long as it does not violate the spirit of the present invention.

On the other hand, the surface modification processing by blasting is performed by spraying metal powder such as iron powder or ore powder such as sand. The blast treatment may be dry or wet.

Blasting is preferred, in which iron powder, particularly iron powder having relatively large particles, is dry-jetted. The conditions such as the injection pressure and the injection distance need to be appropriately selected in relation to the steel plate to be treated, but in any case, the cross-sectional shape of the tip of the blade is thick without scraping the entire blade. It may be performed under the condition that the central portion in the vertical direction has a convex curved surface shape, and only the surface of the convex curved surface may be work-hardened by compressive deformation. Also,
If necessary, the surface modification processing may be performed step by step by repeating the steps.

When the surface modification processing by the blast treatment of the present invention is performed, the surface of the blade portion has a substantially convex curved surface in cross section, and the hardness of the surface is particularly the tip portion of the blade portion, that is, the thickness of the tip of the blade portion. Although the hardness of the central portion of the direction increases, the degree of processing and the degree of change in hardness vary depending on the conditions such as blasting time, pressure and the type of steel sheet to be treated. In any case, by repeating the blasting process, it is possible to process to a predetermined range and improve the hardness. The extent to which the surface treatment must be performed depends on the shape of the blade before treatment, the purpose of the cutting blade, and the like.

The thickness (width) of the substantially convex curved surface at the tip of the blade is, for example, at least 6 when a new cutting blade is processed.
It is sufficient that the width is about 8 μm, and even if the width is a stable collapse width + about 10 μm, the convex curved surface shape is effective. That is, when punching is repeated using an untreated blade, the stable crush width becomes stable, but this stable crush width differs depending on the hardness of the cutting edge, and is 10 to 1 for Hv500 to 600.
In the case of 5 μm and Hv 300 to 400, it is about 40 to 45 μm, and generally about 10 to 60 μm is expected. Therefore, although an effect is expected up to about +10 μm, it is preferable that the width is narrower than this, more preferably about 10 to 20 μm. Further, when the used blade in which burrs are generated is processed, the present invention is not limited to this, and the burrs are removed and processed into, for example, a convex curved surface having a width of about 50 μm, so that the blade can be reused. Further, the surface hardening in the shot blasting treatment may be almost eliminated, but can be carried out to the extent of increasing by 0 to 80 Hv. Further, the site and the depth of the surface modified by the blast treatment also differ depending on the time of the blast treatment, conditions such as pressure, and the type of steel sheet to be treated, and are not particularly limited.

1 to 4 conceptually show the shot blasting process. Basically, as shown in FIG.
The nozzle 2 is arranged in front of the tip of the blade portion 1a of the cutting blade 1, and the shot blasting treatment is performed while moving the cutting blade 1 or the nozzle 2 along the longitudinal direction of the cutting blade 1. At this time,
As shown in (b), the ejection direction of the nozzle 2 may be inclined in any direction along the movement direction. A plurality of nozzles 2 may be arranged along the longitudinal direction of the cutting blade 1.

Further, the nozzles 2 may be arranged on both sides in the thickness (width) direction of the blade portion 1a of the cutting blade 1. In this case, as shown in FIG.
As shown in (a) and (b), the two nozzles 2 may be inclined toward the tip of the blade portion 1 a of the cutting blade 1. For example, the angle formed by the blade portion 1a of the cutting blade 1 is typically 42 °.
However, for example, the inclination angles δ1 and δ of the two nozzles 2 are
2 are preferably the same, and the opening angle β can be 20 ° or more, preferably about 40 to 90 °. In the case of such a treatment, a region where the propellants collide with each other to kill the velocity occurs at the blade tip position, and it is possible to form a condition that it is difficult to scrape (difficult to flow) even when pressed with high pressure, and therefore one flow is perpendicular to the blade tip. It is thought that the tip shape is less likely to be scraped and the convex shape is better than that of hitting with a line. Also in this case,
It may be inclined along the moving direction (feed direction).
(C) shows a state in which the nozzle 2 is inclined by the angle γ.
In addition, you may arrange in multiple numbers along a moving direction.

Further, as described above, the thickness (width) of the cutting blade 1 is
When arranging the nozzles 2 on both sides in the direction, as shown in FIG. 3A, the nozzle positions on both sides may be shifted in the feed direction. In this case, when there are a plurality of nozzles in the movement direction,
As shown in (b), the injection positions 3 of the nozzles are arranged in a staggered pattern. In this case, since the flow of the propellant is good, it is considered that it can be shaved well and angle forming can be performed according to the arrangement angle, so that a so-called two-step blade can be made with the propellant, and the blade of the cutting blade 1 can be formed. The tip of the portion 1a can be processed to have a more obtuse angle and a rounded shape.

In the above description, the drawing shows a state in which two nozzles 2 are arranged, but one nozzle may be provided with two injection holes, or the injection holes may be inclined. Needless to say, the same is true.

Furthermore, the shot blasting treatment may be performed from both sides in the width direction of the cutting blade (both sides in the lateral direction).
You may go diagonally from the rear toward the tip of the blade. It is considered that such irradiation is effective for deburring a used cutting blade. For example, as shown in FIG. 4 (a), the nozzles 2 may be arranged on both sides in the width direction of the blade portion 5 a of the cutting blade 5 having burrs after use, or as shown in FIG. 4 (b). ,
The nozzle 2 may be arranged obliquely rearward. The opening angle of the nozzle 2 arranged obliquely rearward is arbitrary, but the blade 5
It is preferable to arrange it so as to substantially follow the inclination of a.

The shot blasting treatment of the present invention can be carried out in combination with work hardening treatment such as press working, ironing working, cold rolling working and the like. That is, the steel plate whose hardness is improved by such work hardening treatment may be subjected to the blast treatment, or the work hardening treatment may be performed after the blast treatment.

Since the cross-sectional shape of the blade surface-modified by the shot blasting treatment of the present invention is a substantially convex curved surface, the blade having a perfectly sharp cross-sectional shape has an optimum cutting quality from the start of use. Is obtained and the quality is maintained over a long period of time.

From such a viewpoint, it is not always necessary to modify the surface of the cutting blade having a relatively low hardness in the surface modification processing of the present invention, and the cutting edge of the cutting blade having a sufficient hardness as the cutting blade is shot. By blasting the cutting edge into a substantially convex curved surface, there is an advantage that it is possible to provide a cutting blade that can obtain optimum cutting quality without unnecessary blanking at the start of use. .

Furthermore, since the cutting blade according to the present invention has a base portion that is not substantially quenched and a blade portion having a predetermined hardness due to surface modification, the base portion is more than the blade portion when punching. Since it is largely elastically deformed, the impact on the blade is absorbed, and as a result, the life of the blade is long.

The shot blasting treatment of the present invention may be performed on a single cutting blade, for example, a cutting blade that has been cut to a fixed length, or may be performed after it is fixed to a die-cut base plate.

On the contrary, the method of the present invention has a great advantage in that shot blasting can be performed after the cutting blade is fixed. When the shot blasting process is performed on the die-cutting blade in this way, the machining data of the CAD data for machining the fixed groove such as the cutting blade on the die-die plate can be used as the position data of the shot blasting process. Therefore, there is also an advantage that the work can be very easy.

Further, in the case of treating a cutting blade of such a die, for example, by changing the treatment between the straight portion and the curved portion (corner portion) of the cutting blade, the performance as the die can be improved. There is an advantage. That is, conventionally,
For example, there is a problem that the cutting edge tends to escape and the height becomes low at the corner portion where the cutting blade is bent, so that defective cutting is likely to occur, but when performing the shot blasting treatment, the corner portion (the bent portion is intentionally bent. ) Is not shot-blasted, or the shot-blasting time is shortened so that the blade height of the entire die can be made uniform by performing a different treatment from the straight part. There is an advantage that defective cutting at a part can be prevented.

Furthermore, the method for manufacturing a cutting blade of the present invention can be used to restore a cutting blade that has become uncut. Conventionally, a cutting blade that is no longer cut has been regenerated by exchanging it with a new one or removing burrs, but in any case, the work of pulling out from the punching base plate is dangerous and difficult. However, according to the method of the present invention,
The cutting quality can be improved by treating the used cutting blade with the die fixed. Further, in the die cutting, a partial cutting defect usually occurs, but in this case, there is an effect that the partial cutting blast treatment can avoid the cutting defect.

When the cutting blade is treated in the state of being fixed in the die, the tip end of the ruled line may be similarly surface-modified by shot blasting, which can improve the durability of the ruled line. It goes without saying that you can do it.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below together with one embodiment.

FIG. 5 shows a schematic cross section of a punching machine using the cutting blade of the present invention. The same members as those of the punching machine (FIG. 9) described in the section of the prior art are designated by the same reference numerals.

As shown in FIG. 5, the die 10 fixed to the upper surface plate 100 is a die board 11 to which a cutting blade 12 and a ruled line 13 are fixed. Die board 11
Is usually made of a veneer plate, a resin plate or a metal plate.
4 are formed. On the other hand, the cutting blade 12 and the ruled line 13 are formed by bending a strip-shaped plate material after cutting it into a predetermined length, and are inserted and fixed in a fixing groove 14 formed in the die board 11. After that, the tip portion is shot blasted. The surface is modified by treatment.

On the other hand, the counter plate 600 which is fixed on the dead plate 400 and serves as a face plate has about 1 to 1.5.
It is made of a metal plate material having a thickness of mm, a groove 601 is formed in a portion corresponding to the ruled line 13, and a flat receiving surface 602 is formed in the other portions.

(Example 1) As the cutting blade 12,
Tsukaya Cutlery Thomson blade 7S (blade hardness Hv31
The blade tip 12a of 0) was surface-modified by shot blasting. Shot blast processing is 15
0 mesh pass iron powder (average particle size of about 0.17 mm)
Feed rate 1 at a pressure of 0.2 MPa from a distance of 30 mm
It was carried out under the condition of jetting at 1 mm / sec. As a result, as shown in FIG. 6, the sharp pre-treatment blade portion 21a (FIG. 6 (a)) having a blade edge width of about 2 μm becomes a sectional curved surface blade edge portion 21b having a blade edge width of 26 μm, and a surface modification layer is formed on the surface thereof. 22 is formed (FIG. 6B). Further, in this case, the hardness of the cutting edge after surface modification is not so different from the initial hardness, but when injected at a pressure of 0.4 MPa, a hardness increase of about +80 Hv was observed. In the drawing, the surface modification layer 22 shows a region where the hardness is changed by the shot blast treatment.

Using the punching machine described above, punching load 3
FIG. 7 shows the result of measuring the width of the cutting edge when blanking was performed at 0 kN / m. For comparison, a comparison was made with the case where a cutting blade not subjected to surface modification processing was used.

As a result, the cutting edge 12 of Example 1 showed almost no change in the width of the cutting edge even after performing the blanking 100 times. The width of the cutting edge was about 40 μm, which was a width at which the cutting quality deteriorated.

(Example 2) The cutting blade 12 was a Thomson blade 7S-70 (cutting edge hardness Hv550, manufactured by Tsukaya Hamono Manufacturing Co., Ltd.).
The shot blasting process was performed in the same manner as in Example 1 except that (0) was set. The results of the same test are shown in FIG.

Also in this case, as shown in FIG. 8, it was found that the cutting edge width was constant at about 20 μm from the initial stage of punching, and a constant cutting quality could be maintained from the initial stage of punching. On the other hand, it was confirmed that the cutting blade not subjected to the shot blasting process requires about 20 blank shots until the blade edge width stabilizes at about 10 μm.

[0054]

As described above, according to the present invention,
By using an inexpensive and easy-to-process material, and by only modifying the surface of the cutting blade by shot blasting at the end, a cutting blade with a high hardness blade can be easily formed and punched. The effect that a stable cutting quality can be obtained from the initial stage and a durable punching die and a cutting blade for punching can be realized.

[Brief description of drawings]

FIG. 1 is a diagram conceptually illustrating a state of implementation of shot blasting in a method for manufacturing a punching cutting blade according to the present invention.

FIG. 2 is a diagram conceptually illustrating a state of implementation of shot blasting in the manufacturing method of the punching cutting blade of the present invention.

FIG. 3 is a diagram conceptually illustrating a state of implementation of shot blasting in the manufacturing method of the punching cutting blade of the present invention.

FIG. 4 is a diagram conceptually illustrating a state of implementation of shot blasting in the manufacturing method of the punching cutting blade of the present invention.

FIG. 5 is a schematic cross-sectional view of a punching machine using a punching die according to an embodiment of the present invention.

FIG. 6 is a view conceptually showing the shape of a cutting edge of a cutting blade.

FIG. 7 is a diagram showing a cutting test result of Example 1.

FIG. 8 is a diagram showing a cutting test result of Example 2.

FIG. 9 is a schematic sectional view of a punching machine according to a conventional technique.

FIG. 10 is a plan view showing an example of a punching piece punched by a punching machine.

[Explanation of symbols]

10 die cutting 11 die board 12 cutting blades 13 lines 14 fixed groove 400 dead plate 600 counter plate 601 concave groove 700 sheet material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Nagasawa             19 Miyazawa, Mishima Town, Mishima District, Niigata Prefecture (72) Inventor Yasushi Fukuzawa             2-12-20 Kamikoido, Suginami-ku, Tokyo (72) Inventor Isamu Katayama             3-7 Higashigokencho, Shinjuku-ku, Tokyo Kata Co., Ltd.             Inside the Yamabuki Manufacturing Factory F term (reference) 3C060 AA20 BA03 BB18 BB19

Claims (12)

[Claims] 1. A punching die for punching a sheet material, wherein a cutting blade for punching the sheet material and a rule for forming a ruled line on the sheet material are fixed to a base plate, and the blade portion of the cutting blade is a shot blast. A die for punching, which is characterized by being subjected to surface modification processing. 2. The cutting blade according to claim 1, wherein the strip-shaped thin steel plate having the blade portion is bent, and the cutting blade is shot-blasted after being fixed to the base plate. Die for punching. 3. The punching die according to claim 1, wherein the surface modification processing is performed only in the vicinity of the blade portion of the cutting blade. 4. The blade according to any one of claims 1 to 3, characterized in that the cross-sectional shape of the tip of the surface-modified blade is a convex curved surface with a substantially central portion in the thickness direction protruding. A die for punching. 5. A method of manufacturing a cutting blade for punching for punching a sheet material, characterized in that the blade portion of the unused or unused cutting blade is surface-modified by shot blasting. Manufacturing method of cutting blade for punching. 6. The method for manufacturing a cutting blade for punching according to claim 5, wherein the surface modification processing is performed only in the vicinity of the blade portion of the cutting blade. 7. The striking structure according to claim 5, wherein the cross-sectional shape of the tip of the surface-modified blade portion is a convex curved surface with a substantially central portion in the thickness direction protruding. Manufacturing method of cutting blade for punching. 8. The method for manufacturing a cutting blade for punching according to claim 5, wherein shot blasting is performed after the cutting blade is fixed to a punching-use punching base plate. . 9. The method for manufacturing a cutting blade for punching according to claim 8, wherein the shot blasting process is performed by using CAD data for forming a mounting groove of the cutting blade of the die. 10. The method for manufacturing a cutting blade for punching according to claim 5, wherein the surface modification processing is performed on the cutting blade after use. 11. The surface modification process according to claim 5, wherein the shot blasting nozzle is arranged substantially centrally in the thickness direction toward the tip of the blade portion. Manufacturing method of cutting blade for punching. 12. The surface modification process according to claim 5, wherein two or more shot blast nozzles are juxtaposed in the thickness direction toward the tip of the blade portion. And a method for manufacturing a cutting blade for punching.