Boots – shoes – and leggings
Patent
1992-02-06
1995-12-26
Envall, Jr., Roy N.
Boots, shoes, and leggings
36447418, 36447435, G06F 1546
Patent
active
054793530
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system for correcting a tool deformation amount by which the amount of deformation of a tool is corrected for machining, and more specifically, to a system for correcting an amount of deformation of a tool by which the tool deformation amount is determined from the rigidity and the like of the tool.
2. Description of the Related Art
When a workpiece is machined by a tool, the tool is deformed by a predetermined amount by a cutting reaction force acting thereon, and therefore, a greater machining accuracy can be obtained by correcting this tool deformation amount, even in a numerically controlled machine tool. In general, a tool deformation amount is processed by the operator based on personal experience, together with a tool length correction amount and tool diameter correction amount, and the like.
A problem arises, however, in that although an experienced operator can accurately estimate a tool deformation amount, an operator having little experience cannot do so, and even an experienced operator cannot accurately determine a tool deformation amount when a new workpiece is machined.
As is well known, a tool deformation amount can be accurately determined by using a method of a trial cutting of a workpiece, but much time is lost if a trial cutting must be carried out every time, and further when an expensive workpiece is involved, the trial cutting is undesirable
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a tool deformation amount correction system by which a tool deformation amount can be accurately determined to thereby carry out an accurate machining.
To attain the above object, according to the present invention, there is provided a system for correcting a tool deformation amount by which the amount of deformation of a tool is corrected for machining, which comprises a memory for storing tool deformation parameters for calculating a tool deformation amount, a preprocessing arithmetic operation means for reading a machining program and outputting machining conditions, a tool deformation amount calculation means for determining the tool deformation amount from the tool deformation parameters and the machining conditions, a tool correction means for calculating a tool correction amount, an adder for adding the tool deformation amount and the tool correction amount to a movement command and determining an amount of movement, and an interpolation means for interpolating the amount of movement.
The tool deformation amount calculation means reads the tool deformation parameters such as the rigidity of the tool and the like from the memory, the preprocessing arithmetic operation means reads the machining program and supplies the machining conditions such as a cutting speed and the like necessary for the calculation of the tool deformation amount to the tool deformation amount calculation means, and the tool deformation amount calculation means calculates the tool deformation amount from the tool deformation parameters and machining conditions. Further, the tool correction means determines the tool correction amount, and the tool deformation amount and tool correction amount are added to the movement command to determine the amount of movement interpolated by the interpolation means.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a tool deformation amount correction system according to the present invention; and
FIG. 2 is a diagram showing the relationship between a tool and a workpiece .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is a diagram showing the relationship between a tool and a workpiece. A tool 2 machines the machining surface 1a of a workpiece 1, wherein the tool 2 travels in the direction shown by the arrow 3 and rotates in the direction shown by the arrow 4. At this time, the tool 2 is deformed by a deformati
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P. Muller et al., "CNC-Schleifmaschinensteuerungen mit Fehlerkompensation," ZWF, Zeitschrift fur Wirtshafliche Fertigung, No. 1, Feb. 1990, pp. 86-90, Munchen, DE.
Brown Thomas E.
Envall Jr. Roy N.
Fanuc Ltd.
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