Method for producing a steel strip knife and steel strip knife for tools

专利摘要:
The invention relates to a method for producing a strip steel knife with a hardened cutting edge, wherein one, preferably proximally, an interstage structure and surface having a decarburization, in cross section substantially rectangular steel strip 1 of a machining with formation of a longitudinal cutting edge 2 and subsequent curing of the material in Cutting edge region 6,7 is subjected. In order to achieve an improvement in the cutting edge strength of the steel strip blade or an increase in the life of the tools produced therefrom for machining of sheet material, it is provided according to the invention that in a first step, a cutting-off shaping of the blade facets 3, 3 ', 5, 5' with a cutting edge 2, followed by hardening of the cutting edge region 6, 7 in a second step, which cutting facets 3, 3 'subsequently undergo smoothing by smoothing in a third step for shaping the surface towards the cutting edge 2, after which In a fourth step, at least one subsequent hardening in the cutting edge region 6, 7 is carried out and a hardness increase of the material in the distal cutting edge region 7 to the cutting edge 2 takes place.
公开号:AT520930A4
申请号:T50538/2018
申请日:2018-06-29
公开日:2019-09-15
发明作者:Haas Anton；Kastner Andreas
申请人:Voestalpine Prec Strip Gmbh；
IPC主号:

专利说明:

Summary
The invention relates to a method for producing a band steel knife with a hardened cutting edge, wherein a, preferably proximal, an intermediate stage structure and superficially decarburizing steel strip 1, which is essentially rectangular in cross section, of machining with formation of a longitudinal cutting edge 2 and subsequently hardening of the material in Cutting edge area 6.7 is subjected.
In order to improve the edge retention of the band steel knife or to increase the service life of the tools made therefrom for processing flat material, it is provided according to the invention that in a first step a cutting shape of the cutting facets 3, 3 '; with a cutting edge 2, whereupon the cutting edge area 6, 7 is hardened in a second step, which cutting facets 3, 3 'subsequently undergo machining by smoothing in a third step for shaping the surface towards the cutting edge 2, after which in a fourth step, at least one subsequent hardening is carried out in the cutting edge area 6, 7 and the hardness of the material in the distal cutting edge area 7 towards the cutting edge 2 is increased.
Fig. 1/109
Process for producing a steel strip knife and steel strip knife for tools
The present invention relates to a method for producing a steel strip knife with a hardened cutting edge, wherein a hardenable steel strip, which has an intermediate stage structure and a decarburization on the surface and is substantially rectangular in cross section, is subjected to machining with the formation of a longitudinal cutting edge and subsequently hardening of the material in the cutting edge region becomes.
Furthermore, the invention relates to a band steel knife for producing a tool for processing flat materials.
The aforementioned strip steel knives are used for the manufacture of tools for cutting and / or scribing flat material.
Tool manufacture is essentially carried out by bending the steel strip knife into a desired shape and fixing it in a knife holder.
When a strip steel knife is bent transversely to its longitudinal extension, tensile stresses in the material naturally occur on the outside up to the neutral fiber, which can lead to cracks in the course of a material separation.
For this reason, an essentially rectangular spring steel strip with a surface decarburization to increase the deformability of this layer and with a proximal intermediate stage structure with regard to hardening of the material in the cutting edge area is used as the starting material for the production of band steel knives.
A raw material of the aforementioned type is subsequently machined / 10
Processing with the formation of a longitudinal cutting edge subjected to which processing is usually done by scraping.
To improve the edge retention of the steel band knife or to increase the service life of the tool made therefrom for processing flat material, the cutting edge or the cutting edge region can be subjected to a thermal treatment of the material or a hardening thereof.
A thermal tempering by hardening and tempering or by hardening takes place by heating the material with the creation of an austenitic or partially austenitic structure followed by rapid cooling.
Manufacturing technologies generally used can cause an unfavorable distribution of the material hardness in the cutting edge area, a reduced suitability for bending, an undesirable tendency of the flat workpieces to adhere to the cutting facet of the band steel knife and the like.
The aim of the present invention is to provide a method for producing a band steel knife of the type mentioned at the outset, which method overcomes the disadvantages of the previous production and economically yields an advantageous product quality in a production sequence.
The further object of the invention is to demonstrate an improvement in the quality of the band steel knives and an increase in the service life of the same with use-related advantages in tools.
According to the invention, this aim is achieved in that, in a first step in terms of production technology, cutting facets with a cutting edge are machined on the longitudinal side, whereupon the cutting edge region is hardened in a second step, which cutting facets are subsequently used in a third step to shape the surface Cutting edge undergoes machining by means of smoothing, after which in a fourth step at least / 102 a subsequent hardening is carried out and an increase in hardness of the material in the distal cutting edge area towards the cutting edge takes place.
The advantages achieved with the invention essentially lie in a coordinated sequence of steps.
Machining of the cutting facets from the spring steel strip exposes the proximally positioned intermediate stage structure, which leads to an advantageous hardness assumption of the material in the cutting edge area with thermal tempering.
An intermediate stage structure is largely needle-shaped and has small, possibly submicroscopic, carbides, which are dissolved at high speed during austenitization and, after rapid cooling, produce a fine hardness structure.
The cutting facets, particularly in the cutting edge area from their manufacture, consistently have a disadvantageous roughness measure of the surface, which roughness leads to unfavorable adhesion of the flat material during processing or cutting. In order to remedy this disadvantage, according to the invention, after hardening in a third step, shaping is carried out by fine machining by smoothing the surface of the cutting edge area toward the cutting edge and a roughness measure is set, which measure has a minimum tendency for the cut material or the flat material to stick Band steel knife causes.
A fine machining of the surface of the cutting facets, with the corresponding economic efficiency, can lead to a tempering of the hardness structure with an unfavorable drop in the material hardness towards the cutting edge due to the heat generated. According to the invention, at least one subsequent hardening is carried out in a subsequent fourth step, which increases the hardness of the material towards the cutting edge.
Preferred / 103 to be set according to the invention are in the subclaims
Areas of a particular material hardness, the geometric shape of the cutting edge and the roughness of the surface.
According to the invention, the further object is achieved in that the band steel knife has an intermediate stage structure in the proximal cross section, the cutting facets to the cutting edge, with a radius of max. 2.5 μm, have surfaces smoothed by fine machining and the hardness of the material in the distal cutting edge area down to a depth of 0.05 to 0.15 mm in the facet area is at least 650 HV and is reduced in the proximal direction.
It has been found that tool cutting edges with small edge radii are particularly advantageous for processing plastic surface materials.
A high hardness of the tool material in the edge area advantageously extends the edge retention in difficult use and can have advantages if the band steel knife is trimmed in the tool (AT 508 551 B1).
A band steel knife for producing a tool according to the invention is characterized in claims 5 to 7.
The invention is explained in more detail with the aid of the example shown in the drawing and material tests for a steel strip knife.
Show it:
Fig. 1 shows a basic structure and an arrangement of areas of a band steel knife according to the invention in cross section.
Fig. 2 is a metallographic structural representation of a band steel knife according to the invention.
Fig. 3 shows a detail of Fig. 2 in the facet area
The following list of reference symbols is intended to make it easier to assign the areas of a strip steel knife according to the invention / 104.
steel strip
cutting edge
3.3 'cutting facets
4.4 ‘marginal decarburization
5.5 'Further facet part (s)
Cutting edge area hardened
Cutting edge area with subsequent hardening (s)
Surface layer in the cutting area
1 schematically shows a strip steel knife in cross section, formed from a steel strip 1 with an end-end carbonization 4,4 ″ and cutting facets 3,3 ″ positioned on the narrow side of the steel strip toward the cutting edge 2, each with a further facet 5,5 ″.
If such a cross-sectional shape of a band steel knife with a cutting edge 2 and at least one facet 3, 3 'can be produced with different machining operations, in many cases shaping is carried out by scraping a steel strip 1 and hardening with induction heating of the area of the cutting edge 2.
However, a chip removal has at most machining grooves in the workpiece or a roughness of the surface of the cutting facets 3, 3 ′ of the band steel knife, which consistently cause unfavorable adhesion tendencies between the tool and the workpiece when cutting a flat material. Attempts have already been made to smooth the surface of the cutting facets 3, 3 '' by means of polishing or fine grinding in order to overcome this disadvantage.
Contrary to the expert opinion, however, it was found that for an advantageous detachment of the flat material from the surface of the cutting facets of the band steel knife, both a maximum value and a minimum degree of roughness preferably represent limit values. Accordingly, the values for Ra between 0.005 to 0.12 μm and Rz between 0.05 to 1.2 μm must be set by fine machining using smoothing (roughness parameters according to ÖNORM EN ISO 4287).
/ 105
A targeted fine machining with high performance on the cutting facets 3,3 'in the area towards the cutting edge 2 can, however, result in a drop in the material hardness in this area.
According to the invention, the material hardness in the distal cutting edge region 7 is to be set to more than 650 HV on the cutting edge 2 proximally to a depth of 0.15 mm by means of a follow-up hardening or by means of follow-up hardening, as a result of which the strip steel knife has a high edge retention.
Fig. 2 shows a strip steel knife according to the invention in cross section after an etching treatment for structural display.
A steel strip 1 with an intermediate stage structure and an edge decarburization on the surface (lightly etched) each has multi-part facets with a cutting edge.
A cutting edge area 6 shows a tempering structure which extends from the cutting edge 2 to approximately 300 μm into the cutting facet.
From the cutting edge up to about 145 μm in the cutting edge area, the tempering structure is shaped by a subsequent hardening as a finely structured hardening structure, which is lightly etched
Fig. 3 shows the cutting facet of Fig. 2 on an enlarged scale.

权利要求:
Claims (7)
[1]
1. A method for producing a steel band knife with a hardened cutting edge (2), a steel strip (1) having a, proximal, an intermediate stage structure and superficially a decarburization (4,4 ') having a machining process with the formation of a longitudinal cutting edge (2) and subsequently subjected to hardening of the material in the cutting edge area (6, 7), characterized in that in a first step, the cutting facets (3,3 '; 5,5') are machined along the length to form a cutting edge ( 2), whereupon the cutting edge region (6; 7) is hardened in a second step, which cutting facets (3, 3 ') subsequently undergo machining in a third step for shaping the surface towards the cutting edge (2) Finishing by means of smoothing is experienced, after which in a fourth step at least one subsequent hardening in the cutting edge area h (6,7) is carried out and the hardness of the material in the distal cutting edge region (7) increases towards the cutting edge (2).
[2]
2. The method according to claim 1, characterized in that the cutting facets (3,3 '; 5; 5') are shaped according to the first step by scraping and in the second step an inductive hardening of the cutting edge region (6,7) to a value from 550 to 700 HV is carried out.
[3]
3. The method according to claim 1 and claim 2, characterized in that the surfaces of the cutting edge regions (6,7), produced according to steps 1 and 2, smoothed by fine machining with a roughness Ra of 0.005 to 0.12 μm and Rz of 0 , 05 to 1.2 μm (according to ÖNORM EN ISO 4287) and an edge radius of the cutting edge (2) thus created is formed with S <2.5 μm.
[4]
4. The method according to claims 1 to 3, characterized in that based on the geometric design and the local energy input into the smoothed surface (8,8 ') in the facet area (3,3'; 5,5 '), the parameters of the subsequent hardening (s) determined and a material hardness of over 650 HV from the cutting edge (2) proximal to a depth of 0.05 to 0.15 mm in the
8/107
Facet area (7,6) can be created.
[5]
5. band steel knife for the production of a tool, in particular a tool for processing flat materials such as cardboard, corrugated cardboard, plastic foils and the like, manufactured with at least one longitudinal side cutting facet created by machining with a hardened cutting edge (2), characterized in that the band steel knife (1) in cross section proximally has an intermediate stage structure, the cutting facets (3.3 '; 5.5') to the cutting edge (2), with a radius of max. 2.5 μm, have surfaces smoothed by fine machining (3.3 ') and the hardness of the material in the distal cutting edge area (7) down to a depth of 0.05 to 0.15 mm in the facet area is at least 650 HV and is reduced in the proximal direction.
[6]
6. Steel band knife according to claim 5, characterized in that the surfaces (3,3 ') of the cutting facets machined or smoothed by means of fine machining (3.3'; 5.5 ') have a roughness Ra of 0.005 to 0.12 μm and Rz from 0.05 to 1.2 μm (according to ÖNORM EN ISO 4287.)
[7]
7. strip steel knife according to claim 5 or 6, characterized in that the surfaces of the smoothed cutting areas (7,6) at least in the distal cutting edge area (7) a surface layer (8,8 ') formed during one or another subsequent hardening, namely an oxide skin and / or carries a sliding layer or hard material layer.

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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ATA50538/2018A|AT520930B1|2018-06-29|2018-06-29|Method for producing a steel strip knife and steel strip knife for tools|ATA50538/2018A| AT520930B1|2018-06-29|2018-06-29|Method for producing a steel strip knife and steel strip knife for tools|

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TW108117133A| TWI753257B|2018-06-29|2019-05-17|Method for producing a strip steel knife, and strip steel knife for tools|

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EP19177183.1A| EP3586991B1|2018-06-29|2019-05-29|Method for producing a steel strip blade and steel strip blade for tools|

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US16/447,503| US20200023420A1|2018-06-29|2019-06-20|Method for producing a strip steel knife, and strip steel knife for tools|

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CN201910541460.8A| CN110653581A|2018-06-29|2019-06-21|Method for producing a strip steel cutter and strip steel cutter for a cutter|

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KR1020190075773A| KR20200002635A|2018-06-29|2019-06-25|Method for manufacturing strip steel cutter and strip steel cutter for tools|

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JP2019119360A| JP2020001164A|2018-06-29|2019-06-27|Method for manufacturing strip steel cutter and strip steel cutter for tool|