US3616712A - Stainless steel knife blade and process for the manufacture thereof - Google Patents

Stainless steel knife blade and process for the manufacture thereof Download PDF

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Publication number
US3616712A
US3616712A US38329A US3616712DA US3616712A US 3616712 A US3616712 A US 3616712A US 38329 A US38329 A US 38329A US 3616712D A US3616712D A US 3616712DA US 3616712 A US3616712 A US 3616712A
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United States
Prior art keywords
blade
stainless steel
blank
cutting edge
core
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Expired - Lifetime
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US38329A
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English (en)
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Rolf-Jurgen Eickhorn
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K11/00—Making cutlery wares; Making garden tools or the like
    • B21K11/02—Making cutlery wares; Making garden tools or the like knives

Definitions

  • FIG.1 STAINLESS STEEL KNIFE BLADE AND PROCESS FOR THE MANUFACTURE THEREOF Filed May 18, 1970
  • FIG.1 STAINLESS STEEL KNIFE BLADE AND PROCESS FOR THE MANUFACTURE THEREOF Filed May 18, 1970
  • FIGA A first figure.
  • the purpose of the invention is to enable these disadvantages to be avoided and to provide a blade unaffected by dish-water and detergents, particularly a washingmachine-proof blade, with normal shape and cross-section but nevertheless with the necessary hardness, accompanied by elasticity, together with the desired cutting power and cutting stability.
  • the invention proposes a process for the production of stainless steel knife blades which is characterized by the fact that a semi-finished product consisting of stainless steel, with or without carbon and also of any desired alloying ingredient, is shaped with extra core-hardness, the blade being worked out of the hard core of the said semi-finished product.
  • the invention is thus based on the realization that when stainless steels are shaped into blades or similar objects the surface of the material will be somewhat less hard, after the shaping process, than the core of the blank.
  • the blank is depth-hardened, or the hardening is carried out in such a way that a softer elastic core is left.
  • a blank is first of all shaped, e.g. by hot forging, with a considerably greater volume than that intended for the finished blade, and this intermediate product can then be further shaped to form a semi-finished product, e.g. by the cold shaping process, the finished blade being finally worked out of the core of the said semi-finished product.
  • the operation of working the finished blade out of the core can be effected, for example, by grinding the surplus material off the core belonging to the semi-finished product and forming the blade, thus exposing the said core.
  • the machining can be carried out in such a way that only the material surrounding the core is shaped beyond the flow limit, thus providing a comparatively hard core surrounded by a softer outer skin.
  • the core will have a Rockwell hardness of the order of 42-50 R that of the outer skin being only about 35-42 R
  • the invention further provides that in the case of the blank and the semi-finished product the surplus of material can be the maximum in the zone corresponding to the cutting edge of the finished blade, i.e. a comparatively moderate surplus of material can be adopted in the remaining portions of the blade, so that the deformation energy can be kept fairly low.
  • the hardness of the-blade in the non-cutting zones is somewhat less than in the portion corresponding to the cutting edge, this does not matter, because the quality of the knife is assessed according to its cutting power and cutting stability; the flexural strength will then also be sufficient in the zones in which the aforementioned extra hardness is not obtained.
  • the stainless steel blank is preferably shaped, e.g. by the cold forming process, into a semi-finished product having a surrounding fin or burr.
  • This fin deliberately produced in the shaping process and destined to form the actual blade, is to be regarded as the fiow zone, thus acting as a clamp surrounding the core, so that in this latter the material is unable to flow in the course of the shaping process and not only retains its original strength as a result of the deformation pressure and the supporting effect of the fin but is actually increased in the strength.
  • This deliberately created fin thus forms a contrast to the otherwise usual forging burr, which does not exert the said clamping and supporting action but is merely to be regarded as surplus material.
  • the fin is removed in the further processing of the semi-finished product.
  • the blank is also available for the blank to be shaped, e.g. by forging, from material with a smooth, e.g. ground and polished surface, providing satisfactory and accurate surfaces in the further processing, this being again a condition for the desired supporting effect.
  • a smooth, e.g. ground and polished surface providing satisfactory and accurate surfaces in the further processing, this being again a condition for the desired supporting effect.
  • the invention also proposes a stainless steelknife blade characterized by the fact that it consists of the core of a blank which has first been forged and then further processed by the cold shaping method, the material of which this blank is made consisting of stainless steel, such as 18/8 steel, which in the initial state takes the form of a cleavage product with a ground surface.
  • a blade of this kind can be produced particularly advantageously from a blank which, in accordance with the invention, is characterized by an extra accumulation of material in the zone of the cutting edge of the finished blade, i.e. the blank possesses, in contrast to blanks of the known kind, far more material in the place where the finished blade is to be thinnest.
  • FIG. 1 is a side view of a blank produced by the hot shaping process
  • FIG. 2 is a plan view of the blade blank shown in FIG. 1;
  • FIG. 4 is a similar cross-section to that shown in FIG. 3, through a semi-finished product made from the blade blank, and likewise on a larger scale.
  • FIGS. 1 to 3 DESCRIPTION OF A PREFERRED EMBODIMENT
  • the blank shown in FIGS. 1 to 3 has an approximately rectangular cross-section in the zone of the cutting edge 2, as shown in particular by FIG. 3.
  • a forging temperature of 600 C. for example, a knife blade can be forged with a drop energy of 2,000 mkp. This not only results in the shape shown in FIGS.
  • the fin is followed by a tongue 5 by means of which the blade can be inserted in a handle and secured there in. It is also possible, however, to produce the blade and the handle in one single piece or to connect the blade to the handle by some other method.
  • FIG. 4 shows how the blank illustrated in FIGS. 1 to 3 is further processed.
  • the shaping of the blank 1 is accompanied by the deliberate formation of a kind of fin 7 around the actual blade 6, particularly in the zone corresponding to the cutting edge, which is to be regarded as the flow zone.
  • This fin 7 functions during the shaping process as a kind of grip or clamp around the actual blade 6, illustrated in broken lines in FIG. 4, so that the material in the core of the blank ll does not flow during the shaping process but is consolidated still further.
  • the actual blade 6 consists of the core of the semi-finished product, which is exposed, e.g. by a grinding process, after the completion of the shaping.
  • the grinding process according to the invention, not only serves to counteract any inaccuracies in the surface but also contributes considerably to the exposure of the hard core of the semi-finished product.
  • the blank used in accordance with the invention for the production of knife blades or similar objects has quite a different shape from the blanks employed in the production of knife blades by the known method.
  • the familiar shape of the knife does not appear until after the final processing.
  • a method of manufacturing a stainless steel knife blade having a finished cutting edge of predetermined shape and volume comprising the steps of (a) forming a blank of stainless steel having an edge forming portion of substantially greater volume than said finished cutting edge,
  • said fin is shaped beyond its fiow limit.
  • said blank deforming step is effected by cold working.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
  • Forging (AREA)
US38329A 1969-05-21 1970-05-18 Stainless steel knife blade and process for the manufacture thereof Expired - Lifetime US3616712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691925846 DE1925846A1 (de) 1969-05-21 1969-05-21 Verfahren zum Herstellen von aus rostfreiem Stahl bestehende Messerklingen und nach diesem Verfahren hergestellte Klingen

Publications (1)

Publication Number Publication Date
US3616712A true US3616712A (en) 1971-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US38329A Expired - Lifetime US3616712A (en) 1969-05-21 1970-05-18 Stainless steel knife blade and process for the manufacture thereof

Country Status (9)

Country Link
US (1) US3616712A (fr)
AT (1) AT300519B (fr)
BE (1) BE750618A (fr)
CH (1) CH525047A (fr)
DE (1) DE1925846A1 (fr)
FR (1) FR2048547A5 (fr)
GB (1) GB1280401A (fr)
LU (1) LU60937A1 (fr)
NL (1) NL7007354A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714850A (en) * 1970-06-16 1973-02-06 Henckels J Zwillangswerk Method of manufacturing of knives
US3844148A (en) * 1973-03-23 1974-10-29 Weatherhead Co Corrosion-resistant flareless tube fitting-ring
WO1997029892A1 (fr) * 1996-02-14 1997-08-21 Julien Gerald J Instruments coupants
EP1382414A4 (fr) * 2001-04-27 2010-07-07 Kan Tech Gmbh Procede de fabrication de la lame d'un outil de coupe et blanc destine a mettre en oeuvre ce procede
US20130111767A1 (en) * 2010-07-26 2013-05-09 Reuben Jon Davis Knife
USD808749S1 (en) * 2016-06-16 2018-01-30 Klein Tools, Inc. Knife blade
CN109047635A (zh) * 2018-10-30 2018-12-21 新昌县奔力机械有限公司 一种制作刀坯用的锻压设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102884884A (zh) * 2012-11-01 2013-01-23 黑龙江红兴隆机械制造有限公司 一种弯曲的水田灭茬搅浆刀及其制作方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714850A (en) * 1970-06-16 1973-02-06 Henckels J Zwillangswerk Method of manufacturing of knives
US3844148A (en) * 1973-03-23 1974-10-29 Weatherhead Co Corrosion-resistant flareless tube fitting-ring
WO1997029892A1 (fr) * 1996-02-14 1997-08-21 Julien Gerald J Instruments coupants
EP1382414A4 (fr) * 2001-04-27 2010-07-07 Kan Tech Gmbh Procede de fabrication de la lame d'un outil de coupe et blanc destine a mettre en oeuvre ce procede
US20130111767A1 (en) * 2010-07-26 2013-05-09 Reuben Jon Davis Knife
US9956696B2 (en) * 2010-07-26 2018-05-01 Start Food-Tech Nz Limited Knife
USD808749S1 (en) * 2016-06-16 2018-01-30 Klein Tools, Inc. Knife blade
CN109047635A (zh) * 2018-10-30 2018-12-21 新昌县奔力机械有限公司 一种制作刀坯用的锻压设备

Also Published As

Publication number Publication date
NL7007354A (fr) 1970-11-24
FR2048547A5 (fr) 1971-03-19
BE750618A (fr) 1970-11-03
CH525047A (de) 1972-07-15
LU60937A1 (fr) 1970-07-20
GB1280401A (en) 1972-07-05
AT300519B (de) 1972-07-25
DE1925846A1 (de) 1970-11-26

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