Electric heating – Metal heating – For bonding with pressure
Patent
1991-07-26
1993-03-09
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
051928450
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a process regulating system as well as a method for carrying out the process.
It is known to utilize, in process regulation systems for ensuring the quality of resistance welding connections, a substitution variable as the command variable, since the parameter which is actually of interest, the spot diameter, cannot be monitored during the welding (Publication "Schweissen und Schneiden", Vol. 32, (1980), No. 12, pages 491 to 495).
A process is also known regulating spot welding (See German patent document DE-OS 37 11 771) in which the mechanical and/or electrical process parameters given for the welding process are monitored during welding and each change of the process parameter within the welding process is fine tunable via several manipulated variables. The welding area is, to this end, subdivided into several areas for regulation, wherein to each of these areas an evaluation scheme is assigned. The trace of the curve for different materials and dimensions is determined on the basis of actual structural parts and is stored.
If a mathematical-physical model of the process cannot be formulated, from which the command variables and other variables of the regulation system can be determined, often the only alternatives are to use either:
a process control in which the control parameters for achieving the target function are optimized and interference influences on the process are either prevented through suitable measures or are compensated for; or
a process regulation with a command variable which describes the target function only insufficiently and consequently can only conditionally compensate for interferences and erroneous process runs.
The invention provides a process, and a device for carrying it out, with which for example the special technical processes in which a functional connection between process input and output parameters parameters is at least in part unknown, while maintaining given limits on the characteristics of the output parameters (target function).
Characteristics of processes in which a functional connection between process input and output parameters is at least in part unknown, are that
in the process (for example in a machine or reactor) variable input parameters, i.e. which are changeable from the outside, are entered through which the process can be influenced,
interference parameters act upon the process whose occurrence and effects on the process are not predictable, and
the result of the process are one or several output parameters, which are to have particular previously defined properties.
In many cases the target function is a parameter which is not directly measurable so that it cannot be fed back to the process input--in the sense of a "classical" regulating circuit. On the other hand, a target function and measurable physical parameters, which may not necessarily be output parameters, often have no unique correlation so that the problem resides in defining one or several command variables for process regulation which permit a sufficiently accurate description of the state or the course of the process.
The starting point of the invention is the structure of a process regulation system with one or several manipulated variables and several command variables. The command variables are derived from the measurable process parameters. These derivations have the goal of reducing the information content of the measuring signals in the sense of a characteristic extraction.
The regulation takes place for each manipulated variable according to an estimated regulation rule.
Measured variables and the derivations herefrom (command variables) which are present as calculation rules, cannot be estimated and must be tailored to the particular type of process. Furthermore, it is assumed that the process is in principle repeatable or proceeds periodically and can be made discrete in time.
The conversion factor corresponds to the sensitivity of the system and must be adapted to the particular process. If the system with resp
REFERENCES:
patent: 3546421 (1970-12-01), Meyer et al.
patent: 4596917 (1986-06-01), Nied et al.
Schweissen and Schneiden, vol. 32, 1980, No. 12, pp. 491-495.
Elektronik, Heft. 26, 1979, pp. 23-29.
Kirmsse Helmut
Wesselmann Ludger
Innovationsgesellschaft fur Fortgeschrittene-Produktionssysteme
Shaw Clifford C.
LandOfFree
Process and device for automatic determination of parameters for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for automatic determination of parameters for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for automatic determination of parameters for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-212342