US 12,343,786 B2
Method and device for monitoring and/or control of a flow-hole and thread-forming process
Michael Ludsteck, Munich (DE); and Manuel Guglhör, Benediktbeuren (DE)
Assigned to Atlas Copco IAS GmbH, Bretten-Goelshausen (DE)
Filed by Atlas Copco IAS GmbH, Bretten-Gölshausen (DE)
Filed on Jun. 9, 2022, as Appl. No. 17/836,847.
Claims priority of application No. 102021115210.0 (DE), filed on Jun. 11, 2021.
Prior Publication US 2022/0395893 A1, Dec. 15, 2022
Int. Cl. B21J 5/06 (2006.01); G05B 19/18 (2006.01)
CPC B21J 5/066 (2013.01) [G05B 19/182 (2013.01); Y10T 29/53383 (2015.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling a flow-hole and thread-forming process in which a fastener is driven through a workpiece with a rotation speed (N), a torque (M), and a feed force (F) over a penetration depth (Z), the method comprising:
a) measuring a process parameter (R(t)) of the flow-hole and thread-forming process;
b) determining a smoothed curve (R*(t)) of the process parameter (R(t));
c) determining a difference (D(t)) of the process parameter (R(t)) and its smoothed curve (R*(t)), D(t)=R(t)−R*(t); and
d) changing a process parameter of the flow-hole and thread-forming process based on the difference (D(t)),
wherein the process parameter (R(t)) is formed based on at least one of: the rotation speed (N), the torque (M), the feed force (F), and the penetration depth (Z).