Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Reexamination Certificate
1998-06-04
2001-06-19
Martin, David (Department: 2837)
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
C318S568110, C318S568230, C318S568100
Reexamination Certificate
active
06249102
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for controlling a multi-axis machine tool.
2. Description of the Related Art
In connection with the control of machine tools, it is necessary to control individual axes as a function of external events, for example the temperature, or of other axes. Known machine tool controls are equipped with the required functions by the manufacturer of the machine tool, or respectively the manufacturer of the control. This means the manufacturer of the controls develops the control in accordance with the actual application case, or, respectively, changes in existing controls must be made by the manufacturer when the purpose of their use is changed.
A result of this is that the customer is required already at the time he places the order for a control to describe the intended application as exactly as possible, or, respectively, he has to contact the manufacturer of the control in case of changes.
It is therefore the object of the invention to recite a method for controlling a machine tool, wherein the user can make an adaptation to the actually prevailing conditions of use within certain limits.
BRIEF SUMMARY OF THE INVENTION
In accordance with the invention, a coupling function is provided for each one of the axes of a machine tool, which can be programmed by the operator.
In an embodiment of the invention, the execution of the coupling function is blocked here until all axes involved in the coupling have been referenced, i.e. until at least the positions of the involved axes or their relative position in relation to each other has been determined.
The method in accordance with the invention has the advantage that the final user of a machine tool can still affect the control of the machine tool. Because of this it is possible to make changes in the requirements of the machine tool rapidly and flexibly at the location of the machine. Protection from damage in the course of processing workpieces by the machine tool is achieved in that all axes involved in a coupling function must be defined in respect to their position before the coupling function can be performed.
In accordance with an advantageous embodiment of the invention the coupling function of each axis is constructed from a predeterminable number of basic operations. It has been shown to be sufficient to set the number of basic operations at ten, wherein the number can become greater or lesser, depending on the intended use.
Each basic operation has at least one source operand and one target operand and contains an operator. Functional connections between different axes or dependencies from predetermined external variables or constant values, for example master-slave-relationships or temperature dependencies, can be programmed in a simple manner by the user in this way. Higher order functions can be realized by two or more individual basic operations.
A further advantageous embodiment of the invention provides that each basic function is defined by means of two parameters. The first parameter contains the source operands, a target operand and the operator. The second parameter contains a direct input value for a source operand. If no direct input value for the basic operation exists, the second parameter is set to zero.
The invention will be explained in what follows by means of the drawing figure.
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patent: 5552688 (1996-09-01), Haga
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patent: 5880956 (1999-03-01), Graf
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patent: 44 20 598 A1 (1995-12-01), None
patent: 0 063 045 A2 (1982-04-01), None
Patent Abstracts of Japan, vol. 10, No. 106 (P-449), published Apr. 22, 1986, regarding Japanese patent publication 60 238903 A, published Nov. 27, 1985.
Brakelmann Michael
Kamieth Ralf
Brinks Hofer Gilson & Lione
Dr. Johannes Heidenhain GmbH
Martin David
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