Metal fusion bonding – Means to apply vibratory solid-state bonding energy to work
Patent
1996-05-15
1999-08-24
Ryan, Patrick
Metal fusion bonding
Means to apply vibratory solid-state bonding energy to work
228 447, B23K 1006, B23K 37000
Patent
active
059414430
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for compaction and subsequent welding of electric conductors, in particular for manufacturing through-type or end nodes of strands using ultrasound in a compaction area adaptable to the conductors and adjustable in height and width, with the conductors to be welded first being compacted and then welded.
Furthermore, the invention relates to a device for compaction and subsequent welding of electric conductors, in particular for manufacturing through-type and end nodes of strands, comprising a sonotrode generating ultrasonic vibrations, of which one surface is a first lateral limiting surface of a compaction area adjustable in height and width, preferably rectangular in cross-section and open at the end, the other limiting surfaces of said compaction area are surfaces of a multi-part counter-electrode, where said counter-electrode comprises a first part movable approximately parallel to the sonotrode surface and forming a (second) limiting surface approximately vertical to the sonotrode surface, and a part movable parallel to the second limiting surface and forming a third limiting surface, from which part extends a movable portion forming a fourth limiting surface running approximately parallel to the sonotrode section, and contacting or almost contacting the first part of the counter-electrode at least during compaction and welding, and where the first part and the second part perform a positively coupled movement during compaction.
DESCRIPTION OF THE PRIOR ART
A suitable method and device for implementation of this method can be found in DE 37 19083, now U.S. Pat. No. 4,869,419. Here, the compaction area is altered in its cross-section both during compaction, i.e. pre-compaction, and during welding. In order to weld the conductors in the required quantity, the welding parameters have to be set individually for each conductor cross-section.
A method for controlling the process for quality checking during ultrasonic welding of workpieces is known from EP 0 208 310 B1. For this purpose, a sonotrode of an ultrasonic welding jig is lowered onto a workpiece positioned on an anvil in order to activate the ultrasonic energy, where a zero adjustment takes place as the sonotrode contacts the workpiece, in order to then activate the sonotrode and cause it to move over a required deformation travel.
A method is known from SU-A 757 337 for ultrasonic welding of thermoplastic substances whereby the sink-in depth of the sonotrode and hence the deformation of the workpieces during the welding operation is recorded by a travel pickup attached directly to the sonotrode. The welding operation ends when there is a change in the prefixed symbol of the second time derivation of the travel signal.
DE-OS 2 149 748 describes a method, a device and a system for manufacturing of connections to integrated circuits. In order to obtain better connections, the force introduced into a tool and also the energy imparted to the latter is controlled by the deformation of the parts being connected that has been ascertained by a travel pickup.
Control of the welding process using ultrasound is known from FR-A 2 303 172 in which the speed of the movement of a sonotrode during the welding process is measured and compared with given limit values, and the energy supply to the sonotrode is limited if presettable thresholds are exceeded.
Even if an attempt is made to optimize welding processes with the aid of known methods or devices, it is necessary to adjust the welding parameters individually depending on the parts to be welded, particularly when through-type and end nodes of strands are to be manufactured by ultrasonic welding.
OBJECTS OF THE INVENTION
The object underlying the present invention is to develop a method and a device of the type mentioned before such that defined welding is possible regardless of the cross-section even if conductors of differing cross-section are to be consecutively welded in an arbitrary sequence.
The problem is substantially solved by the method ac
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Welding Handbook, 8th ed., AWS, pp. 41-42, 1991.
Gotz Heinz
Steiner Ernst
Stroh Dieter
Gamino Carlos J.
Ryan Patrick
Schunk Ultraschalltechnik GmbH
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