Data processing: measuring – calibrating – or testing – Measurement system – Orientation or position
Reexamination Certificate
2002-07-22
2004-03-02
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Orientation or position
C700S028000, C700S118000, C700S119000, C700S159000, C700S182000, C700S195000, C700S255000, C700S262000
Reexamination Certificate
active
06701278
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on an apparatus and a method for generating a set-point value for triggering at least one drive mechanism, in particular for machine tools. In conventional machine tool controllers, movement specifications can be stored in memory inside a so-called parts program in the form of a succession of support points. In order to take certain technical conditions into account, dynamic conditions are stored in memory in, the parts program in the form of feed values. Particularly in the case of a path of motion whose feed values fluctuate severely, ramp-like speed courses can become established, since as a rule, the controller imposes a train of set-point values on the drive mechanism in order to reach the next programmed feed value with maximum acceleration. The discontinuous speed courses that result under some circumstances make high demands on the machine mechanics. These have an adverse effect on the machining quality.
SUMMARY OF THE INVENTION
The object of the invention is to specify suitable set-point values to the drive mechanism of a machine tool so as to achieve a uniform course of speed and/or acceleration. This object is attained with the characteristics of the bodies of the independent claims.
ADVANTAGES OF THE INVENTION
The apparatus and method according to the invention for generating a set-point value for triggering at least one drive mechanism, in particular for a machine tool, includes a parts program or a comparable arrangement for describing a path of motion of a tool that is movable by the drive mechanism. The parts program includes at least two parts program positions with an associated parts program parameter, such as the feed. From the parts program, the controller ascertains a train of set-point values for triggering the drive mechanism. Means are provided for ascertaining a distance that is located between the at least two parts program positions and for generating the train of set-point values as a function of the distance and of the parts program parameter.
Including the distance to be traversed between two position values permits a uniform, continuous specification of the drive mechanism set-point value. By ascertaining the distance still to be traveled, the total (future) path of motion sequence is incorporated into the set-point value specification. As a result, fast, continuous machining of workpieces can be achieved. Gentle speed or acceleration transitions can be attained even when the motion sequences are fluctuating severely. In addition, the apparatus according to the invention enables simple programming of a parts program when the speed specifications are varying sharply. Only two position values have to be programmed with the associated motion values (speed or acceleration). On its own, the controller ascertains the distance located between the two position valves and from that derives a continuous course of the drive mechanism set-point values as a function of the change in the two parts program parameters stored in memory. A path of motion with feed values that vary monotonously need not be specified on the basis of individual NC sets; merely programming the starting and ending feed values as parts program parameters suffices.
In an expedient refinement, the at least two parts program positions, to which respective beginning and ending parts program motion values are assigned, are identified in a certain way in order to cause the controller to ascertain the distance between precisely these two parts program positions. The user can easily alternate between the conventional specification of a drive mechanism set-point value or that according to the invention, depending on the kind of machining desired.
Another advantageous feature provides that the drive mechanism set-point values be interpolated linearly between the parts program parameters with regard to the speed.
Further expedient refinements will become apparent from other dependent claims and from the description.
REFERENCES:
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patent: 6401001 (2002-06-01), Jang et al.
patent: 6401002 (2002-06-01), Jang et al.
patent: 6405095 (2002-06-01), Jang et al.
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patent: 6493607 (2002-12-01), Bourne et al.
patent: 6501997 (2002-12-01), Kakino
patent: 6535794 (2003-03-01), Raab
patent: 2002/0095236 (2002-07-01), Dundorf
Barg Juergen
Deisenroth Joerg
Barlow John
Bhat Aditya
Robert & Bosch GmbH
Striker Michael J.
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