EP0115555B1 - Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante - Google Patents

Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante Download PDF

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Publication number
EP0115555B1
EP0115555B1 EP83101190A EP83101190A EP0115555B1 EP 0115555 B1 EP0115555 B1 EP 0115555B1 EP 83101190 A EP83101190 A EP 83101190A EP 83101190 A EP83101190 A EP 83101190A EP 0115555 B1 EP0115555 B1 EP 0115555B1
Authority
EP
European Patent Office
Prior art keywords
apex
plate
blade
cutting edge
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83101190A
Other languages
English (en)
French (fr)
Other versions
EP0115555A1 (de
Inventor
Calvin Eric Silverstone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Picken Engineering Products Ltd
Original Assignee
Picken Engineering Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Picken Engineering Products Ltd filed Critical Picken Engineering Products Ltd
Priority to DE8383101190T priority Critical patent/DE3371751D1/de
Priority to EP83101190A priority patent/EP0115555B1/de
Priority to AT83101190T priority patent/ATE27417T1/de
Publication of EP0115555A1 publication Critical patent/EP0115555A1/de
Application granted granted Critical
Publication of EP0115555B1 publication Critical patent/EP0115555B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B9/00—Blades for hand knives
    • B26B9/02—Blades for hand knives characterised by the shape of the cutting edge, e.g. wavy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B21D53/64—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades

Definitions

  • This invention relates to a knife blade having a zig-zag cutting edge comprising a series of straight sections of which each adjacent pair are disposed at an angle to one another and meet at an apex, and to a method of making such a knife blade.
  • Such knife blades are commonly used to form chevron-shaped cossettes of sugar beet.
  • corrugated knife blades with sharp V-shaped apices may be used for other purposes than cutting beet and the present invention relates to a method of manufacturing such knife blades irrespective of their intended use.
  • Objects of the invention are to provide a new or improved more economic method of making a knife blade having a zig-zag cutting edge with sharp V-shaped apices.
  • a method of making a knife blade having a zig-zag cutting edge with sharp V-shaped apices on at least one side including the steps of taking a metal plate, forming said plate with a plurality of parallel corrugations which extend from a cutting edge thereof, each corrugation having a V-shaped apex, the forming operation including displacing metal at each apex into a region outwardly of an arc of radius not less than the thickness of the plate in regions spaced from the associated apex and having a centre of curvature lying on a bisector of the apex.
  • the apices on both sides of the plate may comprise sharp V-shaped apices.
  • the metal in said outward region may be machined to provide said sharp apex but alternatively, the displacing operation may form the metal in said region to provide said sharp apex.
  • the entire edge including the pair of straight portions and the apices are machined to provide a sharp zig-zag cutting edge.
  • the displacing operation may provide sufficient metal in said outward region so that, after machining, the thickness of the blade at each apex is not substantially less than the thickness of the straight portions of the blade.
  • the plate may be bent along lines parallel to the cutting edge to provide a stepped shape and the stepped down part distant from the cutting edge, may be provided with apertures and/or other formations, whereby the blade may be attached for example to a slicing machine.
  • a knife blade 10 for cutting beet into cossettes is illustrated.
  • Such knife blades are used in either a vertical drum slicing machine or a horizontal disc slicing machine and in both machines alternate rows of knife blades are offset laterally by a half pitch across the blades so that cossettes of the desired shape are achieved.
  • At least in the United Kingdom knife blades for the above application are of a standard dimension, namely a width of 137mm, a pitch of 7.2mm, and a height of 6mm.
  • each V-shaped corrugation is between 3.25mm and 4.0mm above the forelayer; the higher the knife the thicker the cossette achieved.
  • the distance between the cutting edge of the knife and the rear edge of the forelayer is set to be sufficient to permit the cossette to clear the cutting throat and normally the distance is set in the range 6mm to 8mm.
  • the blade 10 illustrated conforms with these dimensions although it is shown to reduced scale.
  • the blade may be of any other dimensions when conformity with the above standard is not required.
  • the blade 10 comprises a metal plate formed, as hereinafter to be described, to provide a plurality of V-shaped corrugations 11 over the entire plate.
  • each corrugation 11 has a pitch of 7.2mm giving nineteen corrugations over the 137mm width.
  • the plate is bent about lines 12, 13 to provide a stepped and inclined configuration and a stepped down part 15a being inclined relative to a front part 15b.
  • the corrugations are flattened, for example in a pressing operation for the reason hereinafter explained.
  • the corrugated edge 16 of the part 15b is sharpened to provide a zig-zag cutting edge afforded by the sharpened ends of the corrugations 11, as described below.
  • the zig-zag cutting edge comprises a plurality of straight portions 8 adjacent straight portions, for example 6 and 7, being disposed at an angle to one another and meeting at an apex A.
  • the apices A are disposed alternately at one side and the other of a plane P which passes through the straight portions 8, and shown only in Figure 3.
  • the part 15a is provided with suitable apertures indicated at 17 to permit the blade 10 to be secured in position in the slicing machine.
  • the cutting edge 16 is also dressed to an appropriate angle depending upon the nature of the beet to be cut.
  • the dressing and sharpening operations are performed to strict limits set out by the sugar beet processors but do not in themselves form part of the present invention and hence do not require detailed discussion.
  • blades of the above described standard configuration have been made previously by machining from solid blanks. This has been necessary because it has not been possible to produce the zig-zag cutting edge 16 with adequately sharp V-shaped apices, i.e. with a radius of 0.2mm or less and preferably 0.1mm or less, more preferably 0.05mm or less and still more preferably not substantially more than 0.01mm except by this machining technique.
  • the present invention permits the production of a blade 10 of the above described standard type by a much more economical method which will now be described.
  • a flat plate of the desired width, thickness, and length is taken, taking into account the extra length required for providing the corrugated configuration, and the extra width required for the stepped configuration.
  • the plate is then passed through a series of forming rolls whereby the metal plate is roll formed to provide the above described nineteen corrugations 11, over the entire plate.
  • strip or sheet may be drawn from roll stock and roll formed as described above and then blades of the desired dimensions cut from the rotted stock.
  • the forming rolls are designed so that metal is displaced into a region 20, see Figure 4a and Figure 4b, outwardly of an arc, of radius r not less than t, which the plate would not adopt if subjected to a simple bending operation as described with reference to Figure 6a.
  • the desired sharp apex i.e. an apex having a radius of 0.2mm or less and preferably 0.1 mm or less, more preferably 0.05mm or less and still more preferably not substantially more than 0.01mm is preferably produced by designing the rolls so that the metal displaced in the region 20a is formed to the desired sharp radius as illustrated at 21a in Figure 4a wherein the straight sections continue up to the apex A, but may be produced by forming the metal in region 20b adjacent the apex into a bulge and subsequently machining the metal in the region 20 to produce the sharp radius as indicated at 22 in Figure 5.
  • the metal thickness in the region of the apex is not less than the thickness t of the straight portions 6, 7 but is greater than t. It is, of course, possible for the thickness to be slightly less than t if, for some purposes the apex requires machining which results in a slight reduction in thickness below t.
  • the cutting edge is hardened and tempered by subjecting an edge region thereof to a conventional hardening and tempering sequence suitable for the particular alloy steel used and taking the usual precautions against distortion.
  • the hardened and tempered steel should, for example, have a hardness lying in the range 50-54 Rockwell C (550-606 V.P.N.).
  • the corrugations and displacement of metal into the regions 20a and 20b at the apices may be by other forming operations such as by pressing between dies, or the corrugations may be formed to an intermediate configuration by any desired bending operation and the displacement of metal adjacent each apex being performed by a roll forming operation or a pressing or punching operation.
  • the blade 10 has been described as being of stepped configuration. So that the blade 10 can be secured to a slicing machine, apertures 17 are provided in the attachment part 15a of the blade 10, through which shanks of bolts can pass.
  • attachment part 15a is corrugated similar to the cutting part 16, then the bolt heads will not seat properly in contact with the corrugated surface.
  • the corrugations are flattened by a pressing operation, over the attachment part 15a.
  • This presents a problem because the overall thickness of the blade 10 over attachment part 15a will thus be less than that required to provide the correct spacing between adjacent blades, secured to the slicing machine. Further, the bolt heads will stand proud of the attachment part 15a and interfere with the passage of cut beet over the surface of the blade 10.
  • a backing plate 25 is connected to the flattened attachment part 15a by rivets 26 or other fasteners, the backing plate 25 being of such thickness so that the overall thickness of the blade over the attachment part 15a, and the backing plate 25 together, is the same as the thickness of the blade 10 over the cutting part 16.
  • the backing plate 25 has apertures 17a aligned with apertures 17 of the blade.
  • the corrugations over attachment part 15a are flattened as much as possible so that the backing plate 25 can be as thick as possible and thus the edges of the apertures 17a can be rebated to provide a firm seating for a bolt head, and to ensure that the bolt heads lie flush, or nearly flush, with the surface of the backing plate.
  • washers may be provided in the locality of the apertures 17 and the blade 10, to firmly seat the bolt heads.
  • the washers may also have rebated apertures to allow the bolt heads to lie flush with the surface of the washers.
  • the corrugations over attachment part 15a need not be flattened, but in this case, the additional thickness provided by the washer will not severely restrict the passage of cut beet over the surface of the blade, because such thickening occurs only adjacent the apertures 17 of the blade 10.
  • the blade 10 may be straight in a direction parallel to the corrugations 11 and secured in position with an intermediate angled plate to provide the desired angle of inclination.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Food-Manufacturing Devices (AREA)
  • Knives (AREA)
  • Nonmetal Cutting Devices (AREA)

Claims (9)

1. Verfahren zur Herstellung einer Messerklinge (10) mit einer gewellten Schneide (16), mit scharfen V-förmigen Spitzen (A) an zumindest einer Seite, wobei das Verfahren die Schritte aufweist, eine Metallplatte zu nehmen, an der Metallplatte eine Mehrzahl von parallelen Sicken (11) auszubilden, die sich von deren Schneidkante (16) aus erstrecken, wobei jede Sicke (11) eine V-förmige Spitze (A) besitzt, dadurch gekennzeichnet, daß der Schritt des Ausformens einschließt, Metall an jeder Spitze (A) in einem Bereich 20 außerhalb eines Bogens zu versetzen oder zu bringen, welcher einen Radius (r) besitzt, der nicht kleiner ist als die Dicke (t) der Platte in Bereichen, welche von der zugeordneten Spitze (A) beabstandet sind und mit einem Krümmungsmittelpunkt welcher auf einer Halbierungslinie der Spitze (A) liegt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Spitzen (A) auf beiden Seiten der Platte aus scharfen V-förmigen Spitzen bestehen.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Metall in dem nach außen versetzten Bereich (20) so bearbeitet wird, daß sich scharfe Spitzen (A) ergeben.
4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Metall in dem nach außen versetzten Bereich (20) zu einer scharfen Spitze (A) durch den Versetzungsschritt gebildet ist.
5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die gesamte Schneide, einschließlich eines Paares von geraden Bereichen (6, 7), welche an den Spitzen aufeinander treffen, so bearbeitet wird, daß sich eine wellenförmige Schneide (16) ergibt.
6. Verfahren nach Anspruch 3 oder 5, dadurch gekennzeichnet, daß der Versetzungsschritt ausreichend Metall in dem nach außen versetzten Bereich (20) ergibt, so daß, nach einer Bearbeitung, die Dicke (r) der Schneide an jeder Spitze (A) nicht wesentlich geringer ist als die Dicke (t) der geraden Bereiche der Schneide (10).
7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Platte entlang Linien (12, 13) gebogen ist parallel zu der Schneide (16), um eine gestufte Form zu ergeben, wobei der nach unten gestufte Bereich (15a) von der Schneide (16) entfernt ist und daß dieser mit Ausbildungen (17) versehen ist, um zu ermöglichen, daß die Schneide an ein anderes Element angebracht wird.
8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Platte auf erforderlich Größe geschnitten ist bevor die Sicken (11) eingeformt werden.
9. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Platte (10) auf gewünschte Größe geschnitten ist nachdem die Sicken (11) in ein zusammenhängendes Vorratsmaterial eingeformt sind.
EP83101190A 1983-02-08 1983-02-08 Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante Expired EP0115555B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8383101190T DE3371751D1 (en) 1983-02-08 1983-02-08 Method of making a knife blade having a zig-zag cutting edge
EP83101190A EP0115555B1 (de) 1983-02-08 1983-02-08 Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante
AT83101190T ATE27417T1 (de) 1983-02-08 1983-02-08 Verfahren zur herstellung einer messerklinge mit gewellter schneidkante.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83101190A EP0115555B1 (de) 1983-02-08 1983-02-08 Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante

Publications (2)

Publication Number Publication Date
EP0115555A1 EP0115555A1 (de) 1984-08-15
EP0115555B1 true EP0115555B1 (de) 1987-05-27

Family

ID=8190283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101190A Expired EP0115555B1 (de) 1983-02-08 1983-02-08 Verfahren zur Herstellung einer Messerklinge mit gewellter Schneidkante

Country Status (3)

Country Link
EP (1) EP0115555B1 (de)
AT (1) ATE27417T1 (de)
DE (1) DE3371751D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6514402B1 (ja) * 2018-10-09 2019-05-15 株式会社レーベン 調理品

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE459970C (de) * 1924-12-28 1928-05-16 Paul Seydel Verfahren zur Herstellung von zickzackfoermigen Blechkoerpern
FR799656A (fr) * 1935-03-18 1936-06-17 Soc Ind Ferblanterie Procédé et dispositifs pour la fabrication de lames coupantes ondulées
US2590024A (en) * 1949-03-28 1952-03-18 Edgar M Lieberman Method of making pinking scissors
GB925970A (en) * 1958-09-05 1963-05-15 Massey Ferguson Sa Improvements in or relating to the manufacture of knife blades

Also Published As

Publication number Publication date
DE3371751D1 (en) 1987-07-02
ATE27417T1 (de) 1987-06-15
EP0115555A1 (de) 1984-08-15

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