JP2005100472A - Three-dimension processing method and machine by biaxial numerical control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize cutting work of a three-dimensional shape by interlocking rotation of a cutting object with longitudinal feed thereof whereas the cutting work of a three-dimensional shape conventionally requires a numerical control machine tool executing three or more axis control. <P>SOLUTION: The cutting object 1 is fixed to a cutting object rotation shaft 2 and rotated. A rotating tool 12 longitudinally moved by being interlocked with the rotation through a reducer 4 spirally cut the cutting object, and can cut an arbitrarily-shaped curved surface by combining motion of a transverse shaft 8. By numerically controlling the two shafts for the rotation of the cutting object rotation shaft and the transverse feed, that is, both of a cutting object rotation motor 3 and a transverse motor 7, a three-dimensionally arbitrarily shaped object can be processed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a three-dimensional machining method by two-axis control of a numerically controlled machine tool and a machining machine.

Technical background

The conventional two-axis numerically controlled machine tool performs two-dimensional machining with a constant cross-sectional shape, and cannot cut a three-dimensional curved surface having an indefinite cross-sectional shape.
The present invention is greatly different from the conventional invention that requires control of three or more axes in that this is realized by two-axis control.
The following is a conventional invention.
Patent Publication No. 6-110523 Patent Publication No. 7-51989 Patent Publication No. 9-47939

In order to process a three-dimensional curved surface, control of three or more axes is necessary, so a complicated machine is necessary. In addition, the control requires complicated NC data capable of controlling three axes simultaneously, and dedicated software (CAM) is required for data creation.
The present invention is a processing method and a processing machine capable of processing a three-dimensional curved surface by controlling only two axes.

The workpiece rotation motor (3) and the transverse feed motor (7) are controlled by data obtained by developing a three-dimensional curved surface in a spiral shape at equal intervals. The rotation of the work (1) is transmitted to the vertical feed shaft (5) via the transmission (4), whereby the rotation of the work and the vertical feed movement are linked. A horizontal feed base (9) and a tool axis (10) are mounted on the vertical feed base (6), and a rotating tool (12) is mounted on the tool axis.
By controlling the two axes of workpiece rotation and lateral feed with the above configuration, a spiral movement is reproduced at the tip of the tool and a three-dimensional shape is formed. (FIG. 3) In addition, the vertical feed is a processing machine that can adjust the feed distance (helix interval) for each rotation because the feed speed can be changed by the transmission.

  In the invention, a complicated curved surface shape can be machined by numerically controlling the two axes of the workpiece rotation axis (2) and the transverse feed axis (8) with the above-described structure. Not only the machine structure is simple but also the control program can be simplified for a machine tool having three or more axes, and the calculation load of the control device is reduced.

Hereinafter, embodiments of the present plan will be described.
A workpiece rotating shaft (2) to which the workpiece (1) is fixed is driven by a workpiece rotating motor (3).
The rotation of the work is linked to the longitudinal feed shaft (5) via the transmission (4). The vertical feed base (6) is moved by a screw of the vertical feed shaft.
There is a horizontal feed base (9) on the vertical feed base, and the horizontal feed motor (7) drives the screw of the horizontal feed shaft (8) to move the horizontal feed base.
There is a tool axis (10) on which a rotary tool (12) is mounted on a transverse feed base, and the rotary tool is driven by a tool axis motor (11).
The numerical control device controls a workpiece rotation motor (3) and a transverse feed motor (7) to draw a two-dimensional trajectory by combining the rotation of the workpiece and the lateral movement of the tool. When the vertical feed is added, the tool moves in a spiral to draw a three-dimensional curved trajectory.
It is possible to change the longitudinal feed distance for each rotation of the spindle by means of the transmission, and it is possible to set the finished roughness of the work surface.
For the transmission between the workpiece rotation axis and the longitudinal feed shaft, in addition to the mechanical type, a method of attaching a motor controlled by an electrically shifted signal to the longitudinal feed shaft can be considered.

It is a top view of the present invention It is a right view of the present invention. It is a conceptual diagram of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Workpiece 2 Workpiece rotating shaft 3 Workpiece rotating motor 4 Transmission 5 Vertical feed shaft 6 Vertical feed stand 7 Horizontal feed motor 8 Horizontal feed shaft 9 Horizontal feed stand 10 Tool axis 11 Tool axis motor 12 Rotary tool 13 Transmission belt

Claims (2)

  A method of machining a three-dimensional shape object by numerically controlling only two axes of a workpiece rotation axis and a tool traverse axis from data obtained by two-dimensionally developing a three-dimensional curved surface in a spiral at equal intervals.   A numerically controlled machine tool in which the rotating shaft and the longitudinal feed shaft of the work are synchronized via a transmission in order to realize the above machining.

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