DE202009009301U1 - Cutting and scoring tool - Google Patents

Abstract

Cutting and scoring tool, preferably for a pressure cut, consisting of a band-shaped blade (1) with a cutting edge (2) and with at least one cutting edge (3) formed on a blade longitudinal side (4) starting from the cutting edge (2), characterized the cutting bevel (3) has an average roughness (R _Z ) of not more than 0.8 μm and an arithmetic mean roughness (R _a ) of not more than 0.20 μm according to DIN EN ISO 4287.

Description

The The invention relates to a cutting and scoring tool, preferably for a pressure cut, consisting of a band-shaped blade with a cutting edge and at least one on a blade longitudinal side starting from the cutting edge formed chamfer.

One Such tool is used in the paper processing and cardboard industry used to a cardboard, cardboard or plastic material Making blanks for cartons or folding cartons. This is usually done by means of punching devices, the blade-shaped tools with at least the cutting process to record the material level vertical blade so that the at one Blade longitudinal side existing cutting bevel perpendicular to Material level by lifting or rotating movement into the material penetrates. This allows the blanks cut out on the one hand as well as on the other hand to the formation of fold lines by a only partially cut carved, stamped, groomed or angerillt, the fold lines a unfolding of the blank, z. B. allow for a box.

It Cutting and scoring lines are known, either a ground Have bevel or a chamfered chamfer. The ground chamfer can have a minimal hollow ground, resulting in an excellent Sharpness results, so a low punching pressure required is. However, the dimensional accuracy of such a bevel not satisfactory for all purposes.

Under Cockroaches are understood to mean a machining process in which the workpiece to be machined relative to a fixed one Tool, z. B. a hard metal die or the like moves is, d. H. the steel strip is used to form the chamfer in the longitudinal direction pulled through at least one pulling station. Have shaved bevels due to their preparation in the drawing process a very good dimensional stability, so they meet high standards of dimensional accuracy be used. But since the bevel is slightly convex, that is Sharpness of this bevel low, and it does not appear cutting, but pressing on the material, so that higher punching pressures required are.

In order to combine the advantages of the scraped and ground chamfer, the EP 0 234 009 B2 a cutting and scribe line consisting of a steel blade with a beveled chamfer formed on a blade longitudinal side, the blade being hardened in the area of the chamfer and the chamfer having a finish in the hardened area starting from the tip of the chisel. In the following sees the EP 0 234 009 B2 before that the hardened area is about 3/10 to 5/10 mm - measured from the tip of the tip - and the degree of hardness is about 66 HRc and that the chamfer in the hardened area, in particular to a final hardness in the range of 50 to 64 HRc, preferably in the range of 57 to 59 HRc, is tempered. Such tools have proven themselves in practice. The tool has a comparatively increased service life, and the formation of cutting dust is largely avoided. The cutting and scoring tool has a schabriefenfreie from the tip of the claw-free honed surface. The bevel angle of the fine grinding is in an advantageous embodiment about 45 ° to 60 °.

The DE 20 2007 013 402 U1 describes a cutting line for cutting sheet materials comprising a steel strip having a cutting edge, two side surfaces and a spine, further comprising first planar facets on both sides of the steel strip, a first rounded transition between the side surfaces and the first facets, and a second rounded transition between the first facets and the cutting edge. Here, the point angle at the cutting edge is greater than the angle between the first facets. To produce the second rounded transition, second facets may be introduced on both sides of the steel strip between the first facets and the cutting edge. In this known cutting line is provided in preferred embodiments that the first and the second rounded transition, the first facets and / or the second facets are polished. As a result, a simple production of the transitions and a smoothing of the Schabriefen be achieved in order to reduce the accumulated dust volume.

The high demands on those used in cutting and scribing Tools are derived from the fact that the cut good a must have high quality cut or quality. This includes adherence to a geometrically accurate cut surface, the absence of banding and wavy bulges in the cutting direction, the absence of cracks in front of the cutting edge, a low roughness of the cut surface and a minimal Accumulation of cutting dust. For the tools, this means at the lowest possible production costs and short When making the stamping dies, make a high Cutting edge, and indeed a very low height tolerance the blade, dimensional accuracy of the chamfer, high durability of the Tool, in particular by strength and hardness of the blade, as well as ensuring an optimal sequence of the cutting process with regard to a cutting (non-pressing) intrusion in the stamped and in terms of a low punching pressure through minimal cutting resistance and small frictional forces during Striving to be sought.

Of the Invention is based on the object, a cutting and scoring tool of the type mentioned so far to improve that it satisfies the said complex requirements better, wherein it should be produced in a cheap way.

According to the invention, this is achieved in that the cutting bevel has an average roughness depth R _Z of not more than 0.8 μm and an arithmetic mean roughness R _a of not more than 0.20 μm DIN EN ISO 4287 (or earlier Standard DIN 4768 ) having.

By definition, the average roughness depth R _Z is the mean value of the single roughness depths of successive individual measuring sections, whereby single roughness depths are to be understood as meaning the vertical distance of the highest from the deepest profile point in a measuring section. The average roughness R _a is the arithmetic mean of the amounts of all profile values of the roughness profile.

As regards the manufacture of the cutting and scoring tool according to the invention, they are preferably staggered by a wet and / or dry running finish micromachining on the bevel values of the averaged roughness depth R _z of not more than 0.8 .mu.m and a roughness average R _a of not more than 0.20 μm DIN EN ISO 4287 set.

In a preferred embodiment of the tool according to the invention, it can be provided that the cutting bevel has an average roughness depth R _Z of not more than 0.7 μm, preferably not more than 0.5 μm, and an arithmetic mean roughness R _a of not more than 0.10 μm , preferably not more than 0.07 μm, after DIN EN ISO 4287 having.

The invention is based on the finding that the surface quality of the cutting bevel corresponding to the averaged surface roughness R _Z and the arithmetic mean roughness R _{a are} in direct causal relationship with the cutting action of the cutting and scoring tool according to the invention. For example, under otherwise unchanged conditions, a punching force reduction can be achieved by 30 to 50 percent. In case of extreme straightness, a height tolerance of the cutting edge in the range of 0.002 mm to +/- 0.02 mm per running meter can be achieved, whereby the dressing time can be significantly reduced.

The inventive values of the average roughness R _z and the arithmetic mean roughness R _a can be achieved by means of a special finish micromachining, the stepped wet and / or dry - using abrasives of a Mohs hardness of about 9 or a Knoop hardness of over 4500 and also includes the use of leather, felt and fleece to treat the chamfer surface. In the abrasive bodies, it may preferably be cubic boron nitride or diamond, z. B. in grain size of 150 to 240 US mesh or 280 to 600 US mesh after ASTM E 11 or in resin bond as B64-46 or D54-15. The concentration of the abrasive particles is tuned to the process and may in particular be 1 to 4 carats per cm ³ .

In front the finish micromachining, the cutting bevel scraped, ground, etched and / or eroded. A preferred technological Variant is that the phase in per se known Milled and / or scraped, then hardened, tempered and is sanded.

The Hardening can be done inductively, by laser, plasma or electron beam, preferably with air cooling and optionally under Protective gas can be realized. The hardening can be before and / or done after the finish micromachining.

To the Loops may preferably be 800 to 1500, preferably 1000 and 1200 grinding wheels with round grain - particle size distributions according to the standard of FEPA (Fédération Européene of the Fabricants de Produits Abrasifs) for abrasive grains in particular no grinding along the cutting edge according to the invention and scoring tool, but the discs in terms of their Direction of rotation transverse to the longitudinal axis of the invention Cutting and scoring tool standing on the chamfer surface be set.

Further advantageous embodiments of the invention are in the subclaims and the description below. On the basis of several in the enclosed drawing figures shown embodiments the invention will be explained in more detail. Show it:

1 in cross-section and enlarged in relation to the natural size, a first embodiment of a cutting and scoring tool according to the invention,

2 in one of the 1 corresponding representation, a second embodiment of a cutting and scoring tool according to the invention,

3 a profilogram of the surface of a cutting bevel of a cutting and scoring tool not according to the invention,

4 a profilogram of the surface of a cutting bevel of a cutting and scoring tool according to the invention,

5 to 8th further embodiments of a cutting and scoring tool according to the invention.

In the different figures of the drawing are the same parts always provided with the same reference numerals, so they usually each described only once.

As first 1 shows, there is an inventive cutting and scoring tool, which is preferably used for a pressure cut, from a band-shaped blade 1 with a cutting edge 2 and at least one from the cutting edge 2 formed chamfer 3 on a blade side 4 , A between cutting bevel and a midplane XX through the blade 1 formed tip angle μ at the cutting edge 2 may be in a range of 20 ° to 90 °, preferably in the range of 30 ° to 54 °.

According to the invention it is provided that the cutting bevel 3 an average roughness R _z of not more than 0.8 μm and an arithmetic mean roughness R _a of not more than 0.20 μm DIN EN ISO 4287 having. Such values are indicated by the profile picture P3 in FIG 1 indicated, which a section of the in 4 represents illustrated profilogram according to the invention.

Preferably, the cutting bevel 3 an average roughness R _z of not more than 0.7 μm, in particular not more than 0.6 μm, and an arithmetic mean roughness R _a of not more than 0.10 μm, preferably not more than 0.07 μm DIN EN ISO 4287 exhibit.

In the execution according to 1 , but also in the comments according to 2 . 7 and 8th , are the blade long sides 4 each symmetrical to the midplane XX through the blade 1 trained and have two similar cutting chamfers 3 on.

In the statements according to 5 . 6 is provided that the blade longitudinal sides 4 with respect to a longitudinal plane YY through the cutting edge 2 are formed asymmetrically and two dissimilar, especially unequal cutting edges 3 exhibit. It could just be a cutting edge 3 to be available.

For the production of the blade of the tool according to the invention, a known technological treatment can first be carried out by a flat material made of spring band steel for the blade 1 is drawn with a thickness of 0.4 to 2 mm in a carbide tipped, so that thereby one or two sides a cutting bevel 3 is produced. This is called a so-called scraped bevel. The cutting bevel 3 is manufactured with a certain oversize, in particular with an oversize of 2/100 to 4/100 mm. The cutting bevel 3 is now - at least in a high-end range 5 - Hardened, preferably induction hardened with a depth of insertion of 3/10 to 5/10 mm from the cutting edge 2 measured. The curing is preferably carried out to a hardness of 66 HRc. After hardening, tempering takes place in the same area 5 , preferably to a final temper hardness of 57-59 HRc. After that, the chamfer can 3 get a finishing touch, which is carried out such that the existing after cockroach oversize is removed. As a result, at the same time the softer outer skin of the hardened and tempered cutting bevel 3 taken away. By this fine grinding, which can be advantageously carried out with an added grinding wheel, the dimensional accuracy of the scraped cutting bevel 3 not affected, but is prevented by the fine ship that grooves occur in the chamfer surface.

This is followed according to the invention for setting the values of the average roughness depth R _Z and the arithmetic mean roughness R _{a of} the cutting bevel 3 a special finish micromachining. This can in particular in several successive steps stepped - wet and / or dry - using abrasive with a Mohs hardness of over 9 or a Knoop hardness of over 4500 run.

U. a. can as part of the finishing micro-machining of the cutting bevel 3 a lapping process with said abrasive bodies are used, wherein the grinding bodies are distributed in a liquid or paste. The cutting bevel 3 is processed with a lapping disc, between this and the cutting bevel 3 a lapping mixture is, which is a suspension of carrier medium (Läppflüssigkeit), possibly lubricant and Läppkorn (abrasive). As Läppflüssigkeiten example, medium-viscosity all-purpose oils are suitable. The concentration of the abrasive particles is tuned to the process and may in particular be 1 to 4 carats per cm ³ .

In the abrasive bodies, it may preferably be cubic boron nitride or diamond, z. B. in grain size of 150 to 240 US mesh or 280 to 600 US mesh after ASTM E 11 or on a resin bonded panel as B64-46 or D54-15. (B is boron nitride, D is diamond, data 64-46 and 54-15 refer to grain sizes according to FEPA).

In the intermediate and / or finishing stage of the chamfer 3 leather, felt, wool, silk, fleece and poro may also be preferred neoprene are used.

With the cutting and scoring tool according to the invention can cut punch reductions by 30 to 50 percent and a height tolerance of the cutting edge of not more than +/- 0.02 mm per running meter are achieved, so that the dressing time can be lowered significantly.

While at the in 1 illustrated first embodiment, the both sides and symmetrically formed cutting chamfers 3 each directly to a wall section 6 boundaries whose surface is parallel to the mid-plane XX of the blade 1 runs is in the in 2 illustrated second embodiment of a cutting and scoring tool according to the invention provided that each cutting chamfer 3 each to a standing at a smaller angle to the center plane XX Anschlußfase 7 adjacent, which in turn connect to the wall section 6 whose surface is parallel to the mid-plane XX of the blade 1 runs.

The non-cutting acting chamfer 7 requires no special finish micro-machining. It can - as usual for the production of chamfers and also, as already mentioned, for the first method section for the production of the chamfer 3 applicable - be prepared by processes or process steps, such as scraping, grinding, fine grinding, etching and / or erosion. For this purpose, an average roughness R _z and an arithmetic mean roughness R _a after DIN EN ISO 4287 characteristic, which are significantly larger than the respective inventively provided values. Such surface quality values for the connection bevel 7 are through the profile picture P7 in 2 indicated, which a section of the in 3 represented profilogram with known on cutting chamfers existing surface quality.

3 and 4 contain the recorded profilograms and the values of the average roughness depth R _Z and the arithmetic mean roughness R _a . The average roughness R _a on the surface of the cutting bevel formed according to the invention ( 4 ) Is 0.07 microns and the average surface roughness R _Z at 0.43 microns, while the corresponding values of the non-inventively embodied surface of Anschlussfase 7 at 0.12 microns and 0.88 microns were.

3 and 4 contain further and more detailed information about the measuring device and the measuring parameters. For the measurement, the stylus method was used, using the surface roughness tester "Surftest 301" Mitutoyo was used. The stylus method is a method for the metrological description of surfaces, wherein for roughness measurement a probe tip made of diamond is moved at a constant speed over the surface of the sample. Roughness measurement is based on standards DIN 4762 . DIN 4768 . DIN 4772 . DIN 4775 and ISO 4288 , The measuring profile results from the vertical positional shift of the probe tip, which is usually detected by an inductive distance measuring system. For the metrological description of a surface, the standardized roughness parameters, such as the average roughness depth R _Z and the arithmetic mean roughness R _a , are obtained from the measurement profile. For this is the DIN EN ISO 4287 binding. Out 3 and 4 However, it is apparent that the device according to the corresponding Japanese standard JIS2001 is working. In particular, from the 3 and 4 the information on the filter used, the evaluation length, the cut-off wavelength λ _c and the feed can be found. When comparing the profilograms, it should be noted that the measurements according to 4 at twice the feed rate ("M-Gesch") as in 3 were made. As a further measured value, the average roughness value R _{q is} included, which is 0.16 ( 3 ) or 0.08 μm ( 4 ) lies. By definition, the average roughness value R _q is the root mean square value of all profile values of the roughness profile.

In the 5 to 8th shown further embodiments of a cutting and scoring tool according to the invention show that this can be produced in a variety of forms. Thus, it has already been described that in the embodiments according to 5 . 6 provided is that the blade longitudinal sides 4 are formed asymmetrically and two dissimilar cutting bevels 3 exhibit. Here are the cutting chamfers 3 in these, as well as the previous versions, just trained.

But it is also possible that the cutting bevel 3 is curved, like this 7 and 8th demonstrate.

Thus, the execution according to 7 a cutting chamfer 3 on, which is curved over its entire length with a first radius of curvature R1 and a second radius of curvature R2 in the wall portion 6 passes whose surface is parallel to the mid-plane XX of the blade 1 runs.

8th shows an inventive cutting and scoring tool, wherein the cutting bevel 3 at least two areas merging into each other 3a . 3b has, at least a first, in the vicinity of the cutting edge 2 arranged area 3a with - seen in cross-section - convex curvature and at least one to the convex portion 3a subsequent second area 3b seen in cross-section - concave curvature. The latter is located near the transition point of the cutting bevel 3 to the wall section 6 whose surface is parallel to the mid-plane XX of the blade 1 runs. The cutting bevel 3 has - seen in cross-section - at least partially an approximately S-shaped or inverted S-shaped contour on.

The invention is not limited to the illustrated embodiments, but also includes all the same in the context of the invention embodiments. Thus, with regard to further advantageous technical features with which the person skilled in the art can provide the invention without departing from its scope, reference is made to those already mentioned EP 0 234 009 B2 , but also regarding the possible geometric design of the blade 1 or bevels 3 . 7 in full on the DE 197 41 089 A1 , the DE 10 2007 031 904 A1 and the EP 1 10 685 B1 directed.

Further the invention is not yet on the in claim 1 defined feature combination limited, but can also by any other combination of certain characteristics be defined all the individual features disclosed. This basically means virtually every single feature of claim 1 omitted or by at least one on another Steep the application disclosed individual feature can be replaced. insofar claim 1 is only as a first formulation attempt to understand for an invention.

1

blade

2

cutting edge

3

bevel

3a

convex area of 3

3b

concave area of 3

4

Sound long side

5

tip area

6

Wall section of 1

7

Connection bevel between 3 and 6

D

Thickness of 1 ( 6 )

P3

Profile of 3 (Invention)

P7

Profile of 7

R1

Radius of 3

R2

Radius at the transition 3 / 6

R _Z

roughness

R _a

roughness

X X

Middle level of 1

Y-Y

Longitudinal plane of 1 by 2 ( 5 . 6 ).

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0234009 B2 [0005, 0005, 0044]
• - DE 202007013402 U1 [0006]
• - DE 19741089 A1 [0044]
• - DE 102007031904 A1 [0044]
• - EP 110685 B1 [0044]

Cited non-patent literature

• - DIN EN ISO 4287 [0009]
• - Standard DIN 4768 [0009]
• - DIN EN ISO 4287 [0011]
• - DIN EN ISO 4287 [0012]
• ASTM E 11 [0014]
• - DIN EN ISO 4287 [0026]
• - DIN EN ISO 4287 [0027]
• ASTM E 11 [0033]
• - DIN EN ISO 4287 [0037]
• - DIN 4762 [0039]
• - DIN 4768 [0039]
• - DIN 4772 [0039]
• - DIN 4775 [0039]
• - ISO 4288 [0039]
• - DIN EN ISO 4287 [0039]
• - JIS2001 [0039]

Claims (19)

Cutting and scoring tool, preferably for a pressure cut, consisting of a band-shaped blade ( 1 ) with a cutting edge ( 2 ) and at least one on one blade longitudinal side ( 4 ) starting from the cutting edge ( 2 ) formed cutting bevel ( 3 ), characterized in that the cutting bevel ( 3 ) has an average roughness (R _Z ) of not more than 0.8 μm and an arithmetic mean roughness (R _a ) of not more than 0.20 μm according to DIN EN ISO 4287. Cutting and scoring tool according to claim 1, characterized in that the cutting bevel ( 3 ) has an average roughness (R _Z ) of not more than 0.7 μm, preferably not more than 0.5 μm, and an arithmetic mean roughness (R _a ) of not more than 0.10 μm, preferably not more than 0.07 μm, according to DIN EN ISO 4287. Cutting and scoring tool according to claim 1 or 2, characterized in that the cutting bevel ( 3 ) is formed. Cutting and scoring tool according to claim 3, characterized in that the cutting bevel ( 3 ) curved (R1, R2, 3a . 3b ) is trained. Cutting and scoring tool according to one of claims 1 to 4, characterized in that the blade ( 1 ) has a thickness (D) in the range of 0.3 to 2.0 mm, preferably a thickness (D) of about 0.7 mm. Cutting and scoring tool according to one of claims 1 to 5, characterized in that the blade longitudinal sides ( 4 ) symmetrical to the center plane (XX) through the blade ( 1 ) are formed and two similar cutting chamfers ( 3 ) exhibit. Cutting and scoring tool according to one of claims 1 to 5, characterized in that the blade longitudinal sides ( 4 ) with respect to a longitudinal plane (YY) through the cutting edge (YY) 2 ) are formed asymmetrically and two dissimilar, especially unequal cutting edges ( 3 ) or just a cutting bevel ( 3 ) exhibit. Cutting and scoring tool according to one of claims 1 to 7, characterized in that a point angle (μ) at the cutting edge ( 2 ) in the range of 20 ° to 90 °, preferably in the range of 30 ° to 54 °. Cutting and scoring tool according to one of claims 1 to 8, characterized in that the blade ( 1 ) in a lace area ( 5 ) near the cutting edge ( 2 ), preferably in the region of the cutting bevel ( 3 ), in particular to 66 HRc, is cured. Cutting and scoring tool according to one of claims 1 to 9, characterized in that the blade ( 1 ) in a lace area ( 5 ) near the cutting edge ( 2 ), preferably in the region of the cutting bevel ( 3 ), in particular to a final hardness in the range of 50 to 64 HRc, preferably in the range of 57 to 59 HRc, tempered. Cutting and scoring tool according to one of claims 1 to 10, characterized in that the cutting bevel ( 3 ) is scraped, ground, etched and / or eroded. Cutting and scoring tool according to one of claims 1 to 11, characterized in that the cutting bevel ( 3 ), especially in the hardened tip area ( 5 ), starting from the cutting edge ( 2 ) is processed by fine grinding, wherein the Abbeiffmaß the fine grinding is preferably 2/100 to 4/100 mm. Cutting and scoring tool according to one of claims 1 to 12, characterized in that the blade ( 1 ) consists of spring steel strip. Cutting and scoring tool according to one of claims 1 to 13, characterized in that the values of the average roughness (R _Z ) and the arithmetic mean roughness (R _a ) are adjusted by a stepped, wet and / or dry finishing micromachining, the using abrasives having a Mohs hardness greater than 9 or a Knoop hardness exceeding 4500. Cutting and scoring tool according to one of claims 1 to 14, characterized in that the values of the average roughness (R _Z ) and the arithmetic mean roughness (R _a ) are set using cubic boron nitride or diamond grinding wheels. Cutting and scoring tool according to one of claims 1 to 15, characterized in that the values of the average roughness (R _Z ) and the arithmetic mean roughness (R _a ) using abrasive grains in a grain size of 150 to 240 US-mesh or 280 to 600 US mesh according to ASTM E 11 or in synthetic resin bond as B64-46 or D54-15 are set. Cutting and scoring tool according to one of claims 1 to 16, characterized in that the values of the mean roughness (R _Z ) and the arithmetic mean roughness (R _a ) are set using abrasive bodies in a concentration of 1 to 4 carats per cm ³ , Cutting and scoring tool according to one of Claims 1 to 17, characterized in that the values of the average roughness depth (R _Z ) and the arithmetic mean roughness (R _a ) are adjusted by means of a particular stepped finish micromachining, which is a treatment of the surface of the cutting bevel ( 3 ) comprising leather, felt, wool, silk, non-woven and / or porous neoprene. Cutting and scoring tool according to one of claims 1 to 18, characterized in that the values of the mean roughness (R _Z ) and the arithmetic mean roughness (R _a ) are adjusted by means of a finish micromachining, in which a lapping mixture is used, which is a Suspension of abrasive bodies in a carrier medium, optionally containing a lubricant.