US 12,064,837 B2
Method for manufacturing kitchen knife by using multilayer material
Nam Chul Cho, Gongju-si (KR); Jeong Wook Han, Seoul (KR); and Sung Mo Cho, Ulsan (KR)
Assigned to Kongju National University Industry—University Cooperation Foundation, Gongju-si (KR)
Filed by KONGJU NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION, Gongju-si (KR)
Filed on Nov. 30, 2020, as Appl. No. 17/107,120.
Application 17/107,120 is a continuation of application No. PCT/KR2018/012030, filed on Oct. 12, 2018.
Claims priority of application No. 10-2018-0062886 (KR), filed on May 31, 2018.
Prior Publication US 2021/0094132 A1, Apr. 1, 2021
Int. Cl. B23P 15/40 (2006.01); B21J 5/12 (2006.01); B21K 11/02 (2006.01); B24B 3/54 (2006.01); B26B 3/02 (2006.01); C21D 9/18 (2006.01); C23F 1/02 (2006.01); C23F 1/14 (2006.01); C21D 1/58 (2006.01)
CPC B23P 15/40 (2013.01) [B21J 5/12 (2013.01); B21K 11/02 (2013.01); B24B 3/54 (2013.01); B26B 3/02 (2013.01); C21D 9/18 (2013.01); C23F 1/02 (2013.01); C23F 1/14 (2013.01); C21D 1/58 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of manufacturing a knife using a multilayer material, the method comprising:
preparing a multilayer material for manufacturing a knife;
heating and then forging the multilayer material to form a knife-shaped structure including a blade part and a handle part;
grinding the blade part to form a sharpened knife-edge;
applying mud, including kaolin and white clay, to an entire surface of the knife-shaped structure and removing the mud applied to the blade part;
heating the knife-shaped structure applied with the mud, and quenching the heated knife-shaped structure through oil-cooling;
etching a surface of the quenched knife-shaped structure to form a pattern on the surface; and
grinding the surface-etched knife-shaped structure to form a knife having a final shape.