Electric heating – Metal heating – For bonding with pressure
Patent
1982-01-08
1984-11-20
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
2191171, 228179, B23K 1100
Patent
active
044840560
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method for the position control of at least one welding or soldering electrode whereby a signal is supplied as a value corresponding to one electrode position and also a signal is supplied corresponding to the theoretical position, a supply mechanism for the execution of the method, with a supply element to be displaced for the electrode, and also a power unit which is connected to the supply element which is connected, at least with a position measuring means on the input, with an electrode, and supplies an electrical signal on its output with a preset value control unit for the control of at least one positioning preset value signal; further, a comparison unit connected on its input with the receiving output and the control unit output; on the output with a control input connected to the power unit, and also the use of the method for micro-spot welding and/or micro-aperture welding and/or micro-soldering, and further, the use of the supply mechanism for the supply of micro-spot welding electrodes and/or micro-aperture welding electrodes and/or micro-soldering electrodes, such as for Re-Flow soldering.
PRESENT STATE OF TECHNOLOGY
From CH-PS No. 448 308 a device is known in which the position of a welding electrode is detected with the aid of a potentiometer. After applying the welding current, the movement of the electrode where the welding current is applied, is registered and compared with a preset value such that when this preset value signal is obtained, i.e. after the resulting movement of the electrode with welding current, the latter can be brought back.
A method is known from DE-OS No. 23 32 792 whereby the electrical transfer resistance between two welding electrodes and the work piece is detected as and indication that the electrode has attained the working position, such that, by attaining a predetermined minimal resistance value, the welding current can be applied. The movement of the electrode cannot be influenced in any of these known methods before reaching the work piece in a controlled fashion.
REPRESENTATION OF THE INVENTION
The task of the present invention is to ensure contact of the work piece with the least possible mechanical impulse change, even with rapid supply of an electrode against the work piece. This is achieved with a method of the above-mentioned type, by measuring the electrode position in a definite fashion and returning it as control value upon reaching a distance between the electrode and work piece.
Consequently the influence of a power element is already possible before the mechanical contact between the electrode and the work piece, so that the latter is achieved very slowly in the approach phase.
In order to consider the work piece tolerance, it is further proposed that before reaching a second smaller approach distance, the electrode position is measured and fed back as a control value and from then this signal controls the pressure between electrodes and work piece.
The supply mechanism for the execution of the method has a displaceable supply element for the electrode and also a power element which is coupled with the supply element and additionally at least a position measuring means, which is connected on its input with the electrode and supplies an electrical signal on its output; further, a preset value control unit to give at least a positioning preset value signal, and a comparison unit which is connected on the input with the receiver output and the control value unit output and on its output with a control input of the power element, and characterizes itself by the fact that the position measuring means output supplies an electrical signal that will change in a definite fashion with the electrode position, at least after reaching an approach distance between the work piece and electrode.
With such a supply mechanism it is ensured that the electrode position is observed as a control value already before reaching the work piece, as this is necessary for the inventive method.
Usually work pieces can have relatively large sampl
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patent: 3449541 (1969-06-01), Wilcox et al.
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patent: 3553420 (1971-01-01), Shearer, Jr. et al.
patent: 3727822 (1973-04-01), Umbaugh
patent: 4340166 (1982-07-01), Bilane et al.
Rossell Electronique SA
Shaw Clifford C.
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