Boots – shoes – and leggings
Patent
1988-06-29
1989-10-31
Smith, Jerry
Boots, shoes, and leggings
36447431, 318573, G05B 1941
Patent
active
048781711
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a numerical control method for forming a circular arc on a cylindrical surface of a cylindrical workpiece.
2. Description of the Related Art
Conventionally, it has been known to utilize a linear interpolation function of a numerical control unit to effect simultaneous control concerning a rotation axis and a linear axis of a machine tool. Using this function, a tool and a cylindrical workpiece, respectively mounted on the machine tool, are moved relative to each other along a desired machining locus, to thereby form a circular arc on a cylindrical surface of the workpiece. According to the above-mentioned conventional method, however, it is required to set machining conditions for a respective one of a plurality of sections obtained by finely dividing the machining locus. As a consequence, a program for effecting the circular arc machining on the cylindrical workpiece consists of complicated statements. This requires effort for preparation of the program. On the other hand, if a dividing number of the machining locus is decreased for ease of preparation of the program, a drawback occurs in that machining accuracy decreases.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a numerical control method which is capable of performing circular arc machining on a cylindrical workpiece with high accuracy while using a simplified program.
In order to achieve the above-mentioned object, according to the present invention, a numerical control method is provided, in which simultaneous control concerning a rotation axis and a linear axis of a machine tool is effected by means of a numerical control unit which operates in accordance with a machining program, so that a circular arc is formed on a cylindrical surface of a cylindrical workpiece.
In this numerical control method, a distance interval, in the circumferential direction of the workpiece between a start point and an end point of a circular arc to be formed, is calculated on the basis of a moving command value for the rotation axis. The moving command value value is indicative of an angular interval between the start and end points of the circular arc in the circumferential direction of the workpiece and is represented by a unit of angle. Next, a circular arc interpolation processing is executed on the basis of the thus calculated distance interval and a moving command value for the linear axis, which is represented by a unit of length, so as to calculate a first distribution amount for the rotation axis and a second distribution amount for the linear axis, respectively. The first distribution amount is converted into a third distribution amount which is represented by a unit of angle. Then, the linear and rotation axes are controlled in accordance with the second and third distribution amounts, respectively.
In this manner, according to the present invention, the distribution amounts for the rotation and linear axes are obtained by effecting the circular arc interpolation processing on the basis of the value, obtained by the angle/length conversion of the moving command value for the rotation axis, and the moving command value for the linear axis. Control along the linear axis is then performed in accordance with the thus obtained distribution amount for the linear axis. The control around the rotation axis is performed in accordance with the distribution amount, which is represented by the unit of angle and obtained by the length/angular conversion of the distribution amount for the rotation axis, obtained by the circular arc interpolation processing. Therefore, the control for the rotation and linear axes can be carried out so that a tool and the workpiece are moved relative to each other along a desired machining locus, only by setting, in general, the moving command values for the rotation and linear axes. In other words, it is possible to form the circular arc on the cylindrical workpiece with a simplified program.
BRIEF DESCRIPTION OF THE
REFERENCES:
patent: 4031369 (1977-06-01), Heaman et al.
patent: 4704688 (1987-11-01), Kamata
Kiya Nobuyuki
Maeda Kimio
Fanuc Ltd.
Kulbaski James J.
Smith Jerry
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