US 12,117,027 B2
Method of gluing metal parts
Dieter Groß, Mainz (DE); Marcel Denis Knorr, Frankfurt am Main (DE); and Arne Schmidt, Euskirchen (DE)
Assigned to Braun GmbH, Kronberg (DE)
Filed by Braun GmbH, Kronberg (DE)
Filed on Sep. 10, 2020, as Appl. No. 17/017,327.
Claims priority of application No. 19197011 (EP), filed on Sep. 12, 2019.
Prior Publication US 2021/0079940 A1, Mar. 18, 2021
Int. Cl. F16B 11/00 (2006.01); B23K 26/0622 (2014.01); B23K 26/36 (2014.01); C09J 5/02 (2006.01); B23K 101/20 (2006.01); B23K 103/04 (2006.01)
CPC F16B 11/006 (2013.01) [B23K 26/0624 (2015.10); B23K 26/36 (2013.01); C09J 5/02 (2013.01); B23K 2101/20 (2018.08); B23K 2103/04 (2018.08); C09J 2400/166 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of gluing a first part to a second part, the first part having a metal surface, the method comprising the steps of:
providing the first part and the second part, wherein the first part comprises a cylindrical drive shaft having a longitudinal axis;
rotating the first part about the longitudinal axis;
while rotating the first part, pre-treating a portion of the metal surface of the first part with an atmospheric-pressure plasma to at least immobilize layers of volatile organic compounds on the portion of the metal surface that is treated with the atmospheric-pressure plasma,
wherein the portion of the metal surface that is treated with the atmospheric-pressure plasma comprises a first portion and a second portion that is adjoining the first portion;
while rotating the first part, treating only the first portion of the metal surface of the first part with ultra-fast laser pulses having a pulse length in the femtosecond range of from 1 femtosecond to 990 femtoseconds, so that a surface layer of the first portion of the metal surface is removed, thereby forming a treated portion of the metal surface;
applying an adhesive to the treated portion of the metal surface of the first part or to a surface of the second part; and
gluing the first part and the second part together.