Knife Comprising an Upset Forged Bolster
The invention relates to a knife comprising an upset forged bolster ( 18 ) as well as a method for producing such a knife.
1 . A knife with upset-forged bolster.
2 . A knife according to claim 1 , wherein the blade, the bolster, and the tang are formed in one piece.
3 . A knife in accordance with claim 1 , wherein the knife has several material layers.
4 . A knife in accordance with claim 3 , wherein the several material layers are a multilayer steel.
5 . A knife in accordance with claim 3 , wherein at least one material layer has a high hardness.
6 . A knife in accordance with claim 5 , wherein the hardness of this at least one material layer is 54 to 70 HRC and is preferably in a range of 66 HRC.
7 . A knife in accordance with claim 5 , wherein the material layer with high hardness is a hardened steel with a carbon content between 0.5% and 2%.
8 . A knife in accordance with claim 5 , wherein the at least one material layer with high hardness is essentially centrally arranged in a core area.
9 . A knife in accordance with claim 8 , wherein the thickness of the core area takes up at least 50% of the overall thickness of the blade.
10 . A knife in accordance with claim 3 , wherein the number of material layers is odd.
11 . A knife in accordance with claim 5 , wherein the other material layers have a lower hardness than the material layer with high hardness.
12 . A knife in accordance with claim 5 , wherein the other material layers are essentially stainless.
13 . A knife in accordance with claim 3 , wherein visible transitions between material layers are at least partly etched.
14 . A procedure for the manufacture of a knife with a bolster, wherein an upset-forging step is provided to form the bolster.
15 . A procedure in accordance with claim 14 , wherein the blank used for the upset-forging step is preheated.
16 . A procedure in accordance with claim 15 , wherein the blank is heated by resistance heating.
17 . A procedure in accordance with claim 14 , wherein the blank used for the upset-forging step has several material layers.
18 . A procedure in accordance with claim 14 , wherein the blank used for the upset-forging step is cold-rolled.
19 . A procedure in accordance with claim 14 , wherein the blank used for the upset-forging step comprises at least one material layer with high hardness.
20 . A procedure in accordance with claim 19 , wherein this at least one material layer has a hardness of 54 to 70 HRC, or better still a hardness in the range of 66 HRC.
21 . A procedure in accordance with claim 19 , wherein this at least one material layer is hardened steel with a carbon content between 0.5% and 2%.
22 . A procedure in accordance with claim 19 , wherein this at least one material layer is provided essentially centrally in the core area of the blank.
23 . A procedure in accordance with claim 19 , wherein the other material layers have a lower hardness than the material layer with high hardness.
24 . A procedure in accordance with claim 19 , wherein the other material layers are essentially stainless.
25 . A procedure in accordance with claim 14 , wherein the blank used for the upset-forging step is punched out.
26 . A procedure in accordance with claim 14 , wherein the blade, the bolster, and the tang are formed from a one-piece blank.
27 . A procedure in accordance with claim 14 , wherein the upset-forging step is followed by a precision-forging step for further formation of the bolster.
28 . A procedure in accordance with claim 27 , wherein the precision forging step comprises exactly one stroke.
29 . A procedure in accordance with claim 14 , wherein the outline of the knife with the bolster is trimmed away.
30 . A procedure in accordance with claim 17 , wherein visible transitions between material layers are at least partly etched.