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| OF THE INVENTION An embodiment of the present invention will be described below with reference to ... |
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| Magnetically actuated electric switch |
| OF INVENTION Referring now to the single FIGURE of the drawing, a channel or passageway 4, formed ... |
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| System and a process for recording cartographic information on a videodisk |
| The embodiments of the invention in which an exclusive property or privilege is claimed are defined ... |
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| Optical information recording apparatus |
| It is an object of this invention to prevent errors of code discrimination which tends to occur ... |
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| Loading and ejecting device for a disk player |
| OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, a disc player comprises a casing 300 ... |
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| Anti-static support for a cartridge in a disk drive |
| The electrostatic forces generated by the accumulation of static on the cartridge assembly are ... |
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| Optical disc cartridge which protects a disc therein from ambient light |
| Accordingly, an object of the present invention is to provide an optical disc cartridge which ... |
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Method and apparatus for simulating the processing of a workpiece
| Details |
Inventors: Rutkowski, Christian;
Assignee: Dr. Johannes Heidenhain GmbH (Traunreut, DE)
Primary Examiner: Lall; Parshotam S.
Assistant Examiner: Zanelli; Michael
Attorney, Agent or Firm: Willian Brinks Olds Hofer Gilson & Lione
A method and apparatus for simulating the processing of a workpiece by boring or milling by an internal computer model in which the workpiece is described by its corner points and surfaces and a bore or a milling process is described by its enveloping contour. The apparatus includes data memories in which information data about the corner points, the surfaces and the enveloping contour are stored. A control mechanism is connected to the data memories for allocating the information to geometric elements that are deposited in work memories and between which a computing mechanism determines intersection points and stores them in an intersection point memory. The control mechanism links the information data about the previous state of the model, the enveloping contour of the milling operation and the intersection points into a description of the workpiece after processing in the internal computer model and brings it into representation on a display unit. |
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DETAILED DESCRIPTION The present invention provides a method and an apparatus that avoids the disadvantages of the prior art and which makes possible a simulation of the processing of a workpiece with the aid of a numerical control program (NC program) on hand and of an NC control on hand such that the workpiece contours as modified can be represented graphically.
In accordance with the present invention, a method is provided for simulating and representing the processing of a workpiece by a tool such as a numerically controlled machine tool in which, with the aid of data structures, there are formed polygonal boundaries of workpiece surfaces and tool path contours altered by reciprocal three-dimensional linkages, characterized by the following steps: a) storing the polygonal boundaries of the workpiece surfaces and the tool path contours as closed chains having corner points and direction-oriented contour elements as connections between the corner points, the polygonal boundaries of the workpiece and the tool path contour being oppositely direction-oriented; b) identifying, in three dimensions, the intersection points between the contour elements of the polygonal boundaries of the workpiece and the tool path contour; and c) connecting the intersection points with one another to define new corner points of resulting contour elements in the prescribed direction sense, and storing the new corner points for representation of a resulting workpiece.
An apparatus for practicing the method of the invention includes means for processing workpiece data, tool data and tool path data, and display means for representing the resulting workpiece, and is characterized in comprising a plurality of data memories for storing corner point data, surface data and data regarding the tool path contour, a control mechanism connected to the data memories for allocating data stored in the data memories to geometric elements of the workpiece and of the tool path contour, which have been stored in work memories, and a computing mechanism for determining the intersection points and depositing the intersection points in an intersection point memory, wherein the control mechanism links the information data from the intersection point data memory with information data about the previous state of the workpiece to provide changed workpiece data and brings the resulting workpiece into representation on the display means
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