阅读说明：本技术 用于制造带钢刀的方法和用于刀具的带钢刀 (Method for producing a strip steel cutter and strip steel cutter for a cutter ) 是由 安东·哈斯 安德烈亚斯·卡斯特纳尔 于 2019-06-21 设计创作，主要内容包括：本发明涉及一种用于制造带钢刀的方法和用于刀具的带钢刀,其中,优选使近中具有中间过渡组织且表面上具有脱碳部的、在横截面基本上呈矩形的钢带经受切削加工以形成纵向切割刃,并随后在切割刃区域中经受对材料的硬化。为了实现带钢刀的切割耐久性的改善或者由此制成的刀具用于加工面式材料的寿命的提高,根据本发明提出的是,在第一步骤中,在纵向侧进行切割棱面的切削成形以形成切割刃,此后在第二步骤中执行对切割刃区域的硬化,随后在第三步骤中对切割棱面进行通过修光的切削加工,用来对朝切割刃而去的表面进行造型,此后在第四步骤中在切割刃区域中进行至少一次连续硬化,并且朝切割刃而去地在远中切割刃区域中进行对材料的硬度提高。(The invention relates to a method for producing a steel strip cutter and a steel strip cutter for a cutter, wherein a steel strip having a substantially rectangular cross section, preferably having an intermediate structure in the immediate vicinity and decarburized sections on the surface, is subjected to a cutting process to form longitudinal cutting edges and subsequently to a hardening of the material in the region of the cutting edges. In order to improve the cutting durability of a steel strip cutter or to increase the service life of a tool produced therefrom for machining flat materials, it is proposed according to the invention that, in a first step, the cutting of the cutting edge face is carried out on the longitudinal side in order to form a cutting edge, after which a hardening of the cutting edge region is carried out in a second step, after which the cutting edge face is machined by trimming in a third step in order to shape the surface facing the cutting edge, after which in a fourth step at least one continuous hardening is carried out in the cutting edge region and an increase in the hardness of the material is carried out in the region of the remote cutting edge facing the cutting edge.)

1. Method for producing a steel strip cutter with a hardened cutting edge (2), wherein a steel strip (1) which is essentially rectangular in cross section and has an intermediate structure in the near middle and decarburized sections (4; 4') on the surface is subjected to a cutting process to form a longitudinal cutting edge (2) and subsequently to a hardening of the material in the region of the cutting edge (6, 7), characterized in that in a first step a cutting shaping of the cutting edge face (3; 3 '; 5; 5') is carried out on the longitudinal side to form the cutting edge (2), after which in a second step a hardening of the cutting edge region (6; 7) is carried out, after which in a third step the cutting edge face (3; 3') is subjected to a cutting process which is finished by means of a finishing process to shape the surface facing the cutting edge (2), after which in a fourth step the cutting edge region (6, 6 '; 5), 7) At least one continuous hardening is performed and the hardness increase of the material takes place in the distal cutting edge region (7) towards the cutting edge (2).

2. Method according to claim 1, characterized in that the shaping of the cutting edge face (3; 3 '; 5; 5') according to the first step is carried out by scraping and in the second step the cutting edge region (6, 7) is induction hardened to a value of 550 to 700 HV.

3. The method according to claim 1 and claim 2, characterized in that the surface of the cutting edge region (6, 7) produced according to steps 1 and 2 is finished by finishing to a roughness of 0.005 to 0.12 μm Ra and 0.05 to 1.2 μm Rz (according to austria standard)

4. A method according to claims 1 to 3, characterized in that the parameter(s) of the continuous hardening are known on the basis of the local energy introduction and the geometrical configuration into the smoothed face (8; 8') in the facet region (3; 3 '; 5; 5'), and that the material hardness of above 650HV is set from the cutting edge (2) mesially up to a depth of 0.05 to 0.15mm into the facet region (7, 6).

5. Strip steel blade for producing cutting tools, in particular for producing cutting tools for machining flat materials such as cardboard, corrugated paper, plastic films or the like, having at least one cutting edge surface on the longitudinal side, which is produced by means of cutting shaping and has a hardened cutting edge (2), characterized in that the strip steel blade (1) has a central transition in cross section, the cutting edge surfaces (3; 3 '; 5; 5') leading to the cutting edge (2) having a radius of at most 2.5 μm having a surface (3; 3') that is smoothed by means of finishing, and in the far-intermediate cutting edge region (7) up to a depth of 0.05 to 0.15mm in the edge region, the hardness of the material is at least 650HV and decreases in the near-intermediate direction.

6. Steel strip cutter according to claim 5, characterized in that the surface (3; 3') of the cutting edge face (3; 3 '; 5; 5') which is machined or smoothed by means of a fine machining has a roughness (according to Austrian standards) of Ra of 0.005 to 0.12 μm and Rz of 0.05 to 1.2 μm

7. Strip steel knife according to claim 5 or 6, characterised in that the surface of the smoothed-out cutting region (7, 6) has, at least in the distal cutting edge region (7), a surface layer (8; 8'), in particular an oxide skin and/or a sliding or hard layer, which is formed during one or more successive hardening processes.

Technical Field

The invention relates to a method for producing a strip steel cutter having a hardened cutting edge, wherein a hardenable steel strip having a central transition structure and a decarburized section on the surface, which is essentially rectangular in cross section, is subjected to a cutting process to form a longitudinal cutting edge and subsequently to a hardening of the material in the region of the cutting edge.

The invention further relates to a strip cutter for producing a tool for machining flat material.

Background

The above-described band steel knife is used to make a knife for cutting and/or scoring face-type materials.

The tool manufacture is basically performed by bending the strip cutter to the desired shape and fixing the strip cutter in a tool holder.

When the strip knife is bent transversely to its longitudinal extent, tensile stresses inevitably occur in the material on its outer side up to the neutral axis (neutral wire), which can lead to cracks during the severing of the material.

For this reason, a substantially rectangular spring steel strip with surface decarburization to increase the deformability of the layer and with a mesial intermediate structure in view of hardening of the material in the region of the cutting edge is used as starting material for the production of the strip knife.

The starting material of the type described above is subsequently subjected to a cutting process, usually by scraping, to form longitudinal cutting edges.

In order to improve the cutting durability of the steel strip cutter or to increase the service life of the cutter made therefrom for machining flat materials, the cutting edge or the cutting edge region can be subjected to thermal tempering of the material or hardening thereof.

Thermal tempering by hardening and tempering or by hardening is carried out here by heating the material to produce an austenitic or partially austenitic structure and then rapidly cooling.

The commonly used manufacturing techniques may lead to an unfavorable distribution of material hardness in the region of the cutting edge, a reduced ability to bend, an undesired tendency of the planar workpiece to stick to the cutting edge face of the steel band knife, or the like.

Disclosure of Invention

The object of the invention is to provide a method for producing a strip steel cutter of the type mentioned at the outset, which overcomes the disadvantages of previous production and, in the sequence of production steps, brings about an economical production of advantageous product qualities.

A further object of the invention is to provide an improved quality and an improved life of the strip-steel knife, while having application-technical advantages in the cutting tool.

According to the invention, this object is achieved in that, in terms of production technology, in a first step, the cutting shaping of the cutting edge face is carried out on the longitudinal side in order to form the cutting edge, after which in a second step the hardening of the cutting edge region is carried out, after which in a third step the cutting edge face is subjected to a cutting process finished by trimming in order to shape the surface facing the cutting edge, after which in a fourth step at least one continuous hardening is carried out

And the hardness increase of the material takes place in the region of the distal cutting edge, going towards the cutting edge.

The advantages achieved with the invention consist essentially in the sequence of steps being coordinated with one another.

The cutting shaping of the cutting edge face of the spring steel strip exposes a centrally located intermediate transition structure, which leads to a favorable hardenability of the material in the region of the cutting edge during thermal tempering.

The intermediate structure is largely formed in the shape of a needle and has small, possibly submicroscopic carbides, which dissolve at a high rate during austenitization and, after rapid cooling, lead to a fine hardened structure.

The cutting edge surfaces, in particular in the region of the cutting edges, always have an unfavorable surface roughness because of their production, which leads to undesirable adhesion of the surface-type material when it is being machined or cut. In order to overcome this disadvantage, it is proposed according to the invention that after hardening, in a third step, the shaping by smoothing of the surface of the cutting edge region facing the cutting edge is carried out and the roughness is set to such an extent that minimal sticking tendency of the material to be cut or of the surface material on the strip cutter is caused.

A correspondingly economical finishing of the surface of the cutting edge may lead to tempering of the hardened tissue due to the heat generated in the process, with an undesirable reduction in the hardness of the material going towards the cutting edge. According to the invention, at least one continuous hardening is carried out in a subsequent fourth step, which results in an increased hardness of the material going towards the cutting edge.

The regions of material hardness, the geometry of the cutting edge and the roughness of the surface, which are preferably to be set according to the invention, are indicated in the dependent claims.

According to the invention, a further object is achieved in that the strip steel knife has a mesial transition in cross section, the cutting edge face facing the cutting edge with a radius of at most 2.5 μm has a surface finished by the finishing, and in the distal cutting edge region up to a depth of 0.05 to 0.15mm in the edge face region, the hardness of the material is at least 650HV and decreases in the mesial direction.

In particular, for the machining of plastic face materials, cutting tools with small edge radii have been found to be advantageous.

The high hardness of the tool material in the edge region advantageously extends the cutting durability in complex use and can bring advantages when preparing a strip tool in the tool (AT 508551B 1).

The strip steel knife according to the invention for producing knives is indicated in claims 5 to 7.

Drawings

The invention is explained in detail with reference to the examples shown in the drawing and the material study of the strip steel knife.

Wherein:

fig. 1 shows in cross section the basic construction and the area arrangement of a strip steel knife according to the invention;

FIG. 2 shows a metallographic structure of a strip cutter according to the invention;

fig. 3 shows a detail of fig. 2 in the region of the facets.

Detailed Description

In order to facilitate the assignment of the regions corresponding to the strip steel knives according to the invention, the following list of reference numerals will be used.

1 Steel strip

2 cutting edge

3; 3' cutting facets

4; 4' edge carburized portion

5; 5' (further land) portions

6 hardened cutting edge region

7 cutting edge region with continuous hardened portion(s)

8 surface layer in cutting area

Fig. 1 shows schematically in cross section a strip steel cutter consisting of a cutter with an edge carburized portion 4; 4' and the further edge surfaces 5 located on the narrow side of the steel strip facing the cutting edge 2; 5' cutting facets 3; 3' steel strip 1.

Although with different cutting operations it is also possible to produce a cutting part 2 and at least one edge surface 3; such a cross-sectional shape of the strip knife of 3', but in many cases shaping by scraping the steel strip 1 and hardening by induction heating of the area of the cutting edge 2 are performed.

However, chip removal may result in machining grooves in the workpiece or cutting edge faces 3 of the strip cutter; the surface of the 3' has a roughness which, when cutting face-like materials, will always lead to an unfavorable adhesion tendency between the tool and the workpiece. Attempts have been made to cut the facets 3 by polishing or lapping; the surface of 3' is smoothed to overcome this disadvantage.

Contrary to the prevailing opinion in the field, however, it has been found that, in order to advantageously detach the planar material from the surface of the cutting edge face of the strip knife, both the maximum and the minimum of the roughness preferably represent limit values. Therefore, the value of Ra is set to 0.005 to 0.12 μm by finishing by trimmingAnd the value of Rz is set between 0.05 and 1.2 μm (according to Austrian standards)

Roughness characteristic value of EN ISO 4287).

However, in the region going towards the cutting edge 2, the cutting edge face 3; targeted finishing of the 3' at high power may lead to a reduction in the hardness of the material in this region.

According to the invention, in the distal cutting edge region 7, the material hardness is set to a depth of up to 0.15mm proximally at the cutting edge 2 by means of one continuous hardening or by means of a plurality of continuous hardening, whereby a high cutting durability of the band steel knife is achieved.

Fig. 2 shows a strip steel knife according to the invention in cross section after an etching process for the purpose of representing a tissue.

The steel strip 1 with the intermediate structure and the surface with edge decarburisation (light-coloured etching) has a multi-part edge surface with cutting edges.

The cutting edge region 6 shows a tempered texture which extends from the cutting edge 2 into the cutting land by about 300 μm.

The hardened and tempered structure is shaped by continuous hardening to a finely structured hardened structure, which is etched by a light color, approximately 145 μm in the region from the cutting edge to the cutting edge.

Fig. 3 shows the cutting edge face of fig. 2 in an enlarged view.