Cylindrical interpolation system

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Details

36447418, 36447436, 318572, 318573, G05B 19415

Patent

active

052821447

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a cylindrical interpolation for machining a cylindrical surface of a cylindrical workpiece by a numerical control device, and more particularly, to a cylindrical interpolation system in which a tool cutting surface is always located at right angles to the cylindrical surface.


BACKGROUND ART

When carrying out a complicated groove cutting in a cylindrical workpiece, using an end mill at a machining center or the like, the machining operation is effected by controlling a cylindrical axis (Z) and a rotary axis (C), and for such a machining, a cylindrical interpolation system is widely used to facilitate the preparation of a machining program.
FIG. 9 illustrates the cylindrical interpolation system, wherein a cylindrical surface is developed as an assumed plane 2a and an assumed orthogonal coordinate system is established based on the Z axis and an assumed linear axis Cy. This coordinate system is identical to a usual plane coordinate system, and a path of a tool 1 with reference to the orthogonal coordinate system is derived by a program. Since the shape to be machined is programmed with reference to a cylindrical coordinate system, it is converted into the assumed orthogonal coordinate system. After the interpolation for the Z and Cy axes is effected with reference to the orthogonal coordinate system, the amount of movement of the Cy axis is converted back (from the orthogonal coordinate system to the cylindrical coordinate system) into an amount of rotation of the axis of rotation (C axis) 6 of a workpiece 2, to thereby control the C axis. Such a cylindrical interpolation system permits an easy preparation of a program for a complicated groove cutting.
Nevertheless, in the prior art cylindrical interpolation system, the tool cutting surface is not always at right angles to the cylindrical surface. FIG. 10 shows the relationship between a tool and a workpiece during groove cutting according to a prior art cylindrical interpolation, in which a tool axis 1a is controlled so that it is at right angles to the cylindrical surface of the workpiece 2, and therefore, the tool cutting surface 5 and a line 3 perpendicular to the cylindrical surface of the workpiece 2 form a constant angle therebetween. As a result, a hatched portion 4 is cut unnecessarily, and thus a desired machining cannot be carried out.


DISCLOSURE OF THE INVENTION

This invention was created in view of the above circumstances, and an object thereof is to provide a cylindrical interpolation system for correcting a tool position in accordance with a tool contact vector, which is a vector from the center of a tool to a cutting point (point of contact) of the tool, such that the tool cutting surface is always at a right angle to the cylindrical surface.
To achieve the above object, this invention provides a cylindrical interpolation system for machining a cylindrical surface of a cylindrical workpiece, comprising tool diameter correcting means for obtaining a tool center path by calculating a tool diameter offset vector in an assumed plane defined by a cylindrical axis and an assumed linear axis obtained through a development of the cylindrical surface, interpolating means for interpolating the tool center path and outputting a first interpolation pulse related to the assumed linear axis and a second interpolation pulse related to the cylindrical axis, pulse converting means for converting the first interpolation pulse into a third interpolation pulse related to a rotary axis, correction component calculating means for calculating a correction component of a tool contact vector in a direction of the assumed linear axis from the tool diameter offset vector, correction component interpolating means for interpolating the correction component and outputting a first correction pulse related to the rotary axis and a second correction pulse related to an axis perpendicular to the cylindrical axis, and an adder for adding the third interpolation pulse and the first correction pulse and providing an output pulse f

REFERENCES:
patent: 4598380 (1986-07-01), Holmes et al.
patent: 4811235 (1989-03-01), Shirakata
patent: 4878171 (1989-10-01), Kiya et al.
patent: 4959597 (1990-09-01), Kawamura et al.
patent: 5065333 (1991-11-01), Kawamura et al.
patent: 5146410 (1992-09-01), Kawamura et al.
patent: 5153490 (1992-10-01), Ueta et al.

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