DE102021132345A1 - Wear-optimized blade for a knife roller of a soil tillage and/or sowing machine, agricultural soil tillage and/or sowing machine and method for producing a wear-optimized blade - Google Patents

Abstract

Wear-optimized blade for a knife roller of a soil tillage and/or sowing machine, the blade having a flat and elongated base body consisting of a base material with a first hardness, and a hardened area made of a material with a second hardness, which is greater than the first hardness Having, wherein the base body comprises a front side with a bevel forming a cutting edge and a rear side adjoining the cutting edge, the hardened region (5) being formed on the rear side (5).

Description

The invention relates to a wear-optimized blade for a knife roller of a soil tillage and/or seeding machine, an agricultural soil tillage and/or seeding machine with rotating knife rollers that have wear-optimized blades, and a method for producing the wear-optimized blade.

Soil tillage machines are known from the prior art, which are used in particular for crushing harvest and plant residues on an agricultural area. For example, describes the DE 10 2018 205 887 A1 an agricultural soil cultivating machine that has several rows of tools on a frame construction transverse to a direction of travel of the machine. A first row comprises a cutting section in the form of several knife rollers for crushing plant residues on the surface of a soil, followed by a second row with a tine section for distributing the plant residues and for leveling the surface of the soil, and a third row with a soil reconsolidation section. The cutting section comprises at least two knife rollers rotating one behind the other in the direction of travel, with the knife rollers typically rotating about a horizontal axis of rotation which is oriented approximately transversely to the direction of travel of the soil cultivation machine.

Furthermore, systems are also known for combining knife rollers, for example, with conventional disc harrows or other tillage implements or seed drills.

The knife rollers are each composed of a plurality of blades each mounted on a mounting tube substantially along a longitudinal direction of the mounting tube and evenly distributed in a circumferential direction of the mounting tube. In order to achieve a desired work result using the knife roller, it is necessary for the respective cutting edge of a blade to have sufficient sharpness permanently or over a very long period of time. However, the high stress when crushing crop and plant residues on agricultural land leads to wear of the blades, especially the cutting edges. The disadvantage of this is that the cutting edges become blunt and a desired work result cannot be achieved fully and satisfactorily. Accordingly, the blades have to be changed frequently or their cutting edges have to be reground manually, which on the one hand requires work and costs and on the other hand the knife rollers or the soil tillage and/or seed drill cannot be used while the blades are being changed or resharpened.

The invention is therefore based on the object of providing a wear-optimized blade for a knife roller of a soil tillage and/or seeding machine, a method for producing such a blade, and an agricultural soil tillage and/or seeding machine with wear-optimized blades having knife rollers.

This object is achieved by a wear-optimized blade having the features of patent claim 1, by an agricultural machine according to claim 9, and by a method according to claim 10. Advantageous refinements of the invention can be found in the dependent patent claims.

The core idea of the invention is a wear-optimized blade for a knife roller of a soil tillage and/or sowing machine, the blade having a flat and elongated base body consisting of a base material with a first hardness, and a hardened area made of a material with a second hardness, which is greater is as the first hardness. The base body comprises a front side with a chamfer forming a cutting edge and a back side adjoining the cutting edge, with the hardened area being formed on the back side.

In this context, wear-optimized means that the wear of the blade is minimized compared to blades for cutting rollers of a soil tillage and/or seeding machine from the prior art. This has the specific advantage that the service life of the blade can be increased for a desired work result and the blade therefore has to be changed or sharpened less frequently. A further advantage of the blade according to the invention is that the work result is improved compared to blades from the prior art with the same service life and the same load.

According to the invention, the blade has a flat base body. This means that a length extension and a width extension is significantly greater than a thickness of the base body. The base body preferably has a thickness of 5 mm or 6 mm or 8 mm or a preferred thickness in a range from 4 mm to 10 mm.

Likewise, the base body is elongate, so that the longitudinal extension of the base body pers is considerably longer than the width extension. The base body preferably has a length of 300 mm to 1000 mm, for example 584 mm. The base body preferably has a width extension of 50 mm to 120 mm, for example 90 mm. In particular, the respective directions of the length extension, the width extension and the thickness are at least point-wise orthogonal to one another.

The front side is a side of the main body with essentially the same dimensions as the length and width of the main body. The back side is opposite to the front side.

The bevel is a beveled surface on an edge of the front that makes an acute angle with the back. Preferably the acute angle is between 30° and 50°, for example 45°. The chamfer forms the cutting edge with this angle along the longitudinal extension.

According to a preferred embodiment, the hardened area is formed along the cutting edge. The hardened area preferably adjoins the cutting edge at least in part.

In particular, the cutting edge is the parting line between the chamfered face and the back, with the back including the hardened area along the cutting edge. A sharpness of the blade is characterized above all by the fact that the acute angle is as small as possible and the cutting edge is linear, i.e. has essentially no surface. This also means that the cutting edge is not rounded.

The wear of the blade is such that the acute angle formed by the bevel becomes increasingly blunt and/or rounds off the cutting edge due to mechanical stress with plant residues or the ground, so that there is no longer a clear dividing line.

The advantage of the blade according to the invention for a knife roller is that the sharpness of the blade is retained for a significantly longer time compared to conventional blades, despite the mechanical stress. This is achieved in that the material of the hardened area, which at least partially adjoins the cutting edge on the rear side, is removed less by abrasion than the base material of the blade on the front side along the cutting edge. Consequently, both the chamfer with an acute angle and a cutting edge are preserved.

Preferably, the hardness is expressed in units of Rockwell Hardness C (HRC) and determined by the appropriate Rockwell method.

According to a preferred embodiment, the cutting edge is formed along the length of the base body. Correspondingly, the chamfer, which according to the invention is provided on the front side and forms the cutting edge, also extends along the longitudinal extension.

A width extension of the base body is preferably essentially constant along the length extension. In other words, the width extension of the base body essentially does not change as it progresses along the length extension.

The base body preferably runs in a straight line along the longitudinal extension. In the case of a rectilinear longitudinal extent, the base body is thus of essentially rectangular design.

Alternatively or cumulatively, the base body runs spirally and/or helically and/or twisted along the longitudinal extent. The base body would thus be essentially in the form of a strip.

According to a preferred embodiment, a width of the hardened area is at least 10% or at least 20% or at least 25% of the width extension of the base body. Any other width that proves to be advantageous is also conceivable. For example, a width of the cured material is 5 up to 50 millimeters, or 5 to 25 millimeters, preferably substantially 10 millimeters. It is also conceivable that the width, which extends orthogonally to the cutting edge on the rear side and in the same direction as the width extension, varies along the length extension.

According to a preferred embodiment, the hardened area is materially connected to the base body. The hardened area is preferably welded to the base body, in particular welded by means of laser welding and/or laser build-up welding. The base material of the base body is processed and thereby hardened by means of laser welding, the hardened region being formed from hardened base material. Material is applied to the base body using laser deposition welding and welded to the base material.

Preferably, the hardened area comprises a backside coating. According to one embodiment, the hardened area is only the coating. According to an alternative embodiment, the hardened area consists of hardened base material and the coating. Alternatively or cumulatively, the hardened includes Area a 3D contour on the back. In contrast to the coating, which essentially has a 2D contour with a small thickness, preferably less than 0.5 mm, the 3D contour has a greater thickness, at least in sections, preferably greater than 0.5 mm, more preferably between 0 .5mm and 2mm. For example, the 3D contour is applied to the back with an even thickness or, for example, in the form of several weld beads. Any other 3D contour is also conceivable.

According to a preferred embodiment, the first hardness of the base material of the base body is in a range from 35 HRC to 53 HRC. The Rockwell hardness C can be converted into other hardness measurement units, e.g. Vickers (HV) or Brinell (HB) using conversion tables, whereby the corresponding hardnesses in alternative hardness measurement units are also claimed.

According to a preferred embodiment, a hardness difference between the first hardness and the second hardness is in a range from 5 HRC to 20 HRC. The difference in hardness is particularly preferably in a range from 8 HRC to 10 HRC. This difference in hardness advantageously ensures that the blade sharpens itself during operation and wears out less.

According to a preferred embodiment, the base material consists of steel. The base material preferably consists of 42CrMo4 steel or S355 steel or an abrasion-resistant steel. The carrier material preferably consists of Hardox® 400. Hardox® 400 has the advantage that it is extremely tough and hard. The base material particularly preferably consists of a material with high toughness and high hardness.

The object is also achieved by an agricultural soil tillage and/or sowing machine with rotating blade rollers having the features according to claim 9. The machine can be equipped with all of the features already described above in connection with the wear-optimized blade, individually or in combination with one another and vice versa.

The tillage and/or sowing machine is, for example, attached to a tractor and coupled to a hydraulic supply system of the tractor. The machine according to the invention comprises at least one cutting section in the form of rotating knife rollers which typically rotate about horizontal axes of rotation which are oriented approximately transversely to the direction of travel of the machine. A plurality of knife rollers are preferably arranged on the machine. For example, several knife rollers are arranged side by side across the entire width of the machine, transverse to the direction of travel. For example, several knife rollers can also be arranged one behind the other in the direction of travel. According to the invention, these knife rollers have the wear-optimized blades that can be assembled and disassembled on a mounting tube of the knife roller.

The object is also achieved by a method for producing a wear-optimized blade with the features according to claim 10. The method can be used individually or in combination with each other and vice versa.

1. a. Bereitstellen eines flach und länglich ausgebildeten Rohlings bestehend aus einem Grundmaterial mit einer ersten Härte, wobei der Rohling eine Vorderseite mit einer Fase zur Ausbildung einer Schneidkante und eine Rückseite aufweist;
2. b. Herstellen eines gehärteten Bereiches mit einer zweiten Härte, welche größer ist als die erste Härte, an der Rückseite entlang der Schneidkante mittels Bearbeitung des Grundmaterials durch Laserschweißung, und/oder Laserauftragsschweißung einer Beschichtung und/oder einer 3D-Kontur auf das Grundmaterial.

The core of the method according to the invention for producing a wear-optimized blade are the following steps:

1. a. providing a flat and elongate blank consisting of a base material with a first hardness, the blank having a front side with a chamfer for forming a cutting edge and a back side;
2. b. Producing a hardened area with a second hardness, which is greater than the first hardness, on the back side along the cutting edge by machining the base material by laser welding, and/or laser cladding a coating and/or a 3D contour on the base material.

The blank essentially corresponds to the base body, which has been untreated in terms of wear optimization and already has a chamfer on the front side. This blank essentially corresponds to the blades for a knife roller from the prior art, which is provided in the first method step.

In the second process step, the blank is treated further. According to a first embodiment of the method according to the invention, the blank is subjected to laser welding. By absorbing the laser power on the back of the blank along the cutting edge, the temperature in the irradiated area rises extremely quickly. Due to the high cooling rate after the irradiation, this area is hardened compared to an unirradiated area and thus at least partially forms the hardened area.

According to a second embodiment of the method according to the invention, which can be carried out as an alternative or in addition to the first embodiment, the blank is subjected to laser build-up welding. Here, a material is applied to the blank by means of melting and simultaneous application. Preferably, the material applied is Hardox® 400 or another very tough and hard material that at least partially forms the hardened area. The applied material can be applied in the form of a coating and/or a 3D contour.

Further method steps can preferably be carried out which contribute to optimizing the wear of the blade.

According to a preferred embodiment, the blank is processed at least in sections for hardening by means of laser welding and/or laser deposition welding. This has the advantage that the base body, which is formed from the blank, is more resistant and wears less through abrasion.

The chamfer is preferably cumulatively treated by means of laser welding for hardening, which is mechanically stressed particularly during operation. On the one hand, abrasion of the blade is thus advantageously minimized. On the other hand, the sharpness of the blade is maintained or the blade is self-sharpening, in that the hardened area on the back along the cutting edge is harder than the chamfer on the front.

• 1A eine landwirtschaftliche Bodenbearbeitungsmaschine gemäß einer bevorzugten Ausführungsform in einer perspektivischen Ansicht;
• 1B eine landwirtschaftliche Bodenbearbeitungsmaschine der in 1A dargestellten Ausführungsform in einer Draufsicht;
• 1C eine landwirtschaftliche Bodenbearbeitungsmaschine der in 1A und 1B dargestellten Ausführungsform in einer Seitenansicht;
• 2A Bodenbearbeitungswerkzeuge einer landwirtschaftlichen Bodenbearbeitungsmaschine der in 1A bis 1C dargestellten Ausführungsform in einer Draufsicht;
• 2B Bodenbearbeitungswerkzeuge einer landwirtschaftlichen Bodenbearbeitungsmaschine gemäß der in 1A bis 1C dargestellten Ausführungsform in einer perspektivischen Ansicht;
• 3 zwei an einer Konsole in Fahrtrichtung hintereinander angeordneten Messerwalzen in einer perspektivischen Ansicht;
• 4A eine Vorderseite einer verschleißoptimierten Klinge gemäß einer bevorzugten Ausführungsform;
• 4B eine Rückseite einer verschleißoptimierten Klinge gemäß einer bevorzugten Ausführungsform;
• 4C-4E eine technische Zeichnung einer verschleißoptimierten Klinge gemäß einer bevorzugten Ausführungsform mit einer Vorderansicht, einer Seitenansicht von links und einer perspektivischen Ansicht;
• 5A-5C verschleißoptimierte Klingen bevorzugter Ausführungsformen in einer Querschnittsansicht.

Further objects, advantages and advantages of the present invention can be seen from the following description in connection with the drawings. Here show:

• 1A an agricultural soil cultivating machine according to a preferred embodiment in a perspective view;
• 1B an agricultural tillage machine of the in 1A illustrated embodiment in a plan view;
• 1C an agricultural tillage machine of the in 1A and 1B illustrated embodiment in a side view;
• 2A Soil tillage tools of an agricultural tillage machine of the in 1A until 1C illustrated embodiment in a plan view;
• 2 B Soil tillage tools of an agricultural tillage machine according to in 1A until 1C illustrated embodiment in a perspective view;
• 3 two knife rollers arranged one behind the other on a console in the direction of travel in a perspective view;
• 4A a front side of a wear-optimized blade according to a preferred embodiment;
• 4B a rear side of a wear-optimized blade according to a preferred embodiment;
• 4C-4E a technical drawing of a wear-optimized blade according to a preferred embodiment with a front view, a side view from the left and a perspective view;
• 5A-5C wear-optimized blades of preferred embodiments in a cross-sectional view.

In the figures, the same components are to be understood with the corresponding reference numbers. For the sake of clarity, in some figures components may not be provided with a reference number, but they have been referred to elsewhere.

In the 1A until 1C 1 shows various views of a soil treatment machine 100 according to a preferred embodiment in its entirety. The soil cultivating machine 100 shown comprises at least one drawbar 80 which can be connected to a tractor, and a machine frame 90 on which all the components of the soil cultivating machine 100 are arranged. The 2A and 2 B show the tillage tools in the 1A-1C shown soil cultivating machine 100 in different views without the drawbar 80 and without chassis.

The soil tillage tools shown include a cutting section in the form of knife rollers 50 for crushing plant residues on the surface of a soil to be tilled, as well as a tine section 60 and a soil reconsolidation section 70.

A plurality of cutter rollers 50 or all cutter rollers 50 are arranged next to one another transversely to the direction of pull of the soil tillage machine 100, preferably over the entire width of the machine 100, with two cutter rollers 50 being arranged one behind the other in the pull direction. When tilling the soil, the blade rollers 50 come into contact with the soil to be tilled and are set in rotation by the pull of the machine 100 .

The 3 shows two knife rollers 50 arranged one behind the other in the direction of travel on a bracket 54 in a perspective view. The knife rollers 50 are rotatably mounted at their ends on the console 54 via knife roller bearings 53 . The console 54 can in turn be arranged on the machine frame 90, preferably pivotably and spring-loaded and/or damped.

A knife roller 50 comprises a mounting tube 51 which extends essentially horizontally transversely to the direction of travel and can rotate about its longitudinal axis. A plurality of blades 1 are arranged circumferentially distributed on a preferably closed lateral surface of the mounting tube 51, which are preferably detachably connected to the mounting tube 51 via a mounting device 52, with a longitudinal extent 8 of the blades 1 extending essentially horizontally transverse to the direction of travel or pulling. A back 17 of the blade 1 is directed toward the lateral surface, so that a cutting edge 7 opposite the blade back 17 protrudes from the lateral surface. As in 3 shown, the blades 1 are screwed to the mounting tube 52 at the ends of the blades 1, for example via the mounting device 52, so that they can be replaced if necessary. Preferably, the blades 1 run at least slightly spirally along the longitudinal extent 8 of the blades 1 and transversely to the pulling direction.

The cutting edge 7 protruding from the lateral surface of the mounting tube 51 is formed by a chamfer 6 , the chamfer 6 being formed on a front side 4 of the blade 1 along the length 8 . A rear side 5 of the blade 1 is adjacent to the cutting edge 7 and is opposite the front side 4 .

Due to the rotation of the blade cylinder 50, the cutting edge 7 cuts essentially perpendicularly into plant residues on the surface of the soil to be worked and comminutes them. The blade 1 then dips at least partially into the ground to be worked with the cutting edge 1, with the rear side 5 of the blade 1 being directed towards the ground.

The 4A shows the front side 4 of a wear-optimized blade 1 according to a preferred embodiment. The front side 4 has a chamfer 6 which forms the cutting edge 7 on the edge of the blade 1 . Preferably the cutting edge is a line. However, it is also conceivable that the cutting edge 7 has, for example, a wavy finish or the like. The chamfer 6 can be a flat surface. It is also conceivable that the chamfer 6 is concave or convex.

The 4B shows the rear side 5 of a wear-optimized blade 1 according to a preferred embodiment. The back 5 has a hardened area 3, which is represented by the shaded area. The hardened area 3 is adjacent to the cutting edge 7 and extends at least partially along the length 8 of the blade 1. The hardened area 3 is shown as being uniform and continuous, but is not limited to this configuration.

The blade 1 also has mounting holes 12 formed through the front 4 and back 5 . In the 4A and 4B two mounting holes 12 are introduced at the ends of the blade 1, but a different number and positioning of the mounting holes 12 are also conceivable. Metric screws, for example, can be passed through the mounting bores 12 and corresponding bores of the mounting device 52 and mounted on the mounting tube 51 of the cutter roller 50 with screw nuts.

The 4C-4E show in the overall view a technical drawing of a wear-optimized blade 1 according to a preferred embodiment with a front view ( 4C ), a side view from the left ( 4E) and a perspective view ( 4D ). The blade 1 comprises a base body 2 and the hardened area 3. The base body 2 essentially determines the shape, the contours and the dimensions of the blade 1, so that the longitudinal extent 8, a width extent 9 and the thickness 11 of the base body 2 essentially correspond to those of the Blade 1 corresponds.

The base body 2 of the blade 1 or the blade 1 itself is elongated and flat. A tang 13 with a positioning element 14 can be formed on the back 17 of the blade 1, which can be introduced in a form-fitting manner into a correspondingly complementary formation of the mounting tube 51. In particular, the positioning element 14, which preferably has the shape of a wave in the back 17 or in the tang 13, but is not limited to this shape, is designed to be able to latch the blade 1 on the mounting tube 51 in a specific position, so that the assembly is facilitated.

At the respective ends of the back 17, the base body 2 has a rounding 16 in the transition from the longitudinal extension 8 to the lateral extension 9, the radius of which is variable. At the respective ends of the cutting edge 8, the blade 1, as exemplified in FIG 4C shown, in the transition from the lengthwise extension 8 to the widthwise extension 9 each has a sharp edge 15 .

The width extension 9 is essentially constant and does not change along the length extension 8 . Only the tang 13 causes a slightly changed width extension 8 . Likewise, a thickness 11 of the base body 2 is essentially constant and is only reduced by the chamfer 6, preferably over the entire longitudinal extension.

The bevel 6 is formed over the entire thickness 11 and length 8 and thus forms the cutting edge 7, the bevel angle shown as an example being 45°.

Adjacent to the cutting edge 7 is the hardened area 3 which has at least a certain width 10 and is formed along the cutting edge 7 . The one in the 4C shown width 10 is constant. However, the width 10 can also vary along the length 8 .

The 5A - 5C show wear-optimized blades 1 of preferred embodiments in a cross-sectional view, with the bevel 6 on the front side 4 here having a flat surface at a bevel angle of 45° to the back side 5 as an example. In particular, the bevel 6 is continuous, so that the cutting edge 7 is essentially linear.

In the 5A the hardened area 3 represents an area 3a hardened by means of laser welding, which is formed within the contours of the base body 2 . The material of the hardened area 3a corresponds to a material of a blank treated by laser welding. The hardened area 3a and the base body 2 thus emerge from the blank. The chemical composition of the base material of the base body or of the blank consequently corresponds to the chemical composition of the material of the hardened area 3a. However, as a result of the laser welding and the associated thermal quenching, the material of the hardened area 3a has changed in terms of its crystalline structure compared to the crystalline structure of the base material and is therefore hardened.

In the 5B the hardened area 3 represents a coating 3b, which is applied to the base body 2 by means of laser deposition welding and is materially connected or welded. In this preferred embodiment, only the base body 2 emerges from the blank.

The hardened area 3c can also have a 3D contour, as in FIG 5C is exaggerated. The material of the 3D contour is applied to the base body by means of laser deposition welding and firmly bonded or welded. The contours of the illustrated 3D contour are only to be understood as an example, the 3D contour can assume other contours that are useful for crushing plant residues on the soil to be worked.

In particular, the embodiments in the 5A - 5C shown can be combined as desired.

All specified features and embodiments can be combined with one another as desired, unless explicitly excluded. Method features can be used as device features and device features as method features in a corresponding manner.

All features disclosed in the application documents are claimed to be essential to the invention, provided they are new compared to the prior art, either individually or in combination.

Reference List

1

blade

2

body

3, 3a

hardened area

3b

coating

3c

3D contour

4

front

5

back

6

chamfer

7

cutting edge

8th

longitudinal extent

9

latitude

10

Width of the hardened area

11

width of the body

12

mounting hole

13

acknowledgment

14

positioning element

15

edge

16

rounding

17

Move

50

knife roller

51

mounting tube

52

assembly facility

53

knife roller bearing

54

console

60

prong section

70

soil consolidation section

100

tillage and/or sowing machine

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102018205887 A1 [0002]

Claims (11)

Wear-optimized blade (1) for a knife roller (50) of a soil tillage and/or sowing machine (100), characterized in that the blade (1) has a flat and elongated base body (2) consisting of a base material with a first hardness, and a hardened area (3, 3a, 3b, 3c) made of a material with a second hardness which is greater than the first hardness, the base body (2) having a front side (4) with a chamfer forming a cutting edge (7). (6) and a rear side (5) adjoining the cutting edge (7), the hardened area (3, 3a, 3b, 3c) being formed on the rear side (5). Wear-optimized blade (1) according to claim 1 , characterized in that the hardened area (3, 3a, 3b, 3c) is formed along the cutting edge (7), the hardened area (3, 3a, 3b, 3c) at least partially adjoining the cutting edge (7). Wear-optimized blade (1) according to claim 1 or 2 , characterized in that the cutting edge (7) along a length extension (8) of the base body (2) is formed, wherein a width extension (9) of the base body (2) is substantially constant along the length extension (8), the base body ( 2) runs in a straight line and/or spirally and/or helically along the longitudinal extension (8). Wear-optimized blade (1) according to claim 2 , characterized in that a width (10) of the hardened area (3) is at least 10% or at least 20% or at least 25% of the width extension (9) of the base body (2). Wear-optimized blade (1) according to one of the preceding claims, characterized in that the hardened area (3) is materially connected to the base body, the hardened area (3) having a coating (3b) and/or a 3D contour (3c) includes. Wear-optimized blade (1) according to one of the preceding claims, characterized in that the first hardness is in a range from 35 HRC to 53 HRC. Wear-optimized blade (1) according to one of the preceding claims, characterized in that a hardness difference between the first hardness and the second hardness is in a range from 5 HRC to 20 HRC, preferably from 8 HRC to 10 HRC. Wear-optimized blade (1) according to one of the preceding claims, characterized in that the base material consists of a steel, in particular 42CrMo4 steel or S355 steel or an abrasion-resistant steel. Agricultural tillage and / or sowing machine (100) with rotating knife rollers (50), the wear-optimized blades (1) according to one of Claims 1 until 8th exhibit. Method for producing a wear-optimized blade (1) according to one of Claims 1 until 8th , comprising the steps: a. Providing a flat and elongate blank consisting of a base material with a first hardness, the blank having a front side (4) with a chamfer (6) for forming a cutting edge (7) and a back side (5); b. Production of a hardened area (3, 3a, 3b, 3c) with a second hardness on the back (5) by processing the base material by laser welding and/or laser cladding of a coating (3b) and/or a 3D contour (3c). the base material, the second hardness being greater than the first hardness. procedure after claim 9 , wherein the blank is processed at least in sections for hardening by means of laser welding and/or laser deposition welding, wherein the bevel (6) is treated for hardening by means of laser welding.

Images