JPH05324047A - Tangential direction control system for tool axis - Google Patents

Abstract

PURPOSE:To control a tool so as to always direct it toward a tangential direction corresponding to the advancing direction. CONSTITUTION:A pulse distributing means 61 of a CNC 6 performs pulse distribution processing for designated coordinate values X and Y and controls the revolution of servo motors 3 and 4 by sending signals to the servo motors 3 and 4 corresponding to axial pulses DELTAX and DELTAY obtained as the result. In the case of circular arc interpolation, the pulse distributing means 61 sends the axial pulses DELTAX and DELTAY to a tangential direction calculating means 62. Based on those axial pulses DELTAX and DELTAY, the tangential direction calculating means 62 calculates an angle (tangential angle) theta formed by an advancing direction 111 of a tool 62 and a tangential direction 112 and outputs the tangential angle theta to a spindle motor 2. Since the spindle motor 2 is revolved just at the tangential angle theta, a blade face 220 of the tool 22 is controlled so as to be always directed toward the tangential direction 112 corresponding to the advancing direction 111.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tangential direction control system for a tool axis for controlling the direction of a tool of a CNC machine tool, and more particularly to a tangential line for a tool axis for controlling the tool so that the tool always faces the tangential direction with respect to the traveling direction. Regarding directional control method.

[0002]

2. Description of the Related Art In recent years, the performance of a CNC device has been remarkably improved, and it also has a function of controlling a normal direction of a tool shaft, for example. This normal direction control controls the tool axis so that the tool always faces a direction perpendicular to the traveling direction during cutting. By this control, the blade surface of the tool and the advancing direction are always kept vertical, so that cutting work on a curved surface can be smoothly performed.

On the other hand, during the hail processing performed on an aluminum plate or the like, the blade surface of the tool needs to be oriented tangential to the traveling direction. Further, for example, during cutting, it is desirable that the cutting oil be accurately jetted to the cutting surface, and for that purpose, the cutting oil must be always supplied from the same direction with respect to the traveling direction of the cutting tool.

[0004]

However, the conventional CNC is used.
The device does not have the function of tangential control of the tool axis.
For this reason, the blade surface of the tool cannot always be oriented tangential to the traveling direction, and it has been difficult to smoothly perform hail processing and the like. Further, it is difficult to always supply the cutting oil from the same direction as the traveling direction of the cutting tool.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a tangential direction control system for a tool shaft which can control the tool so as to always face the tangential direction with respect to the traveling direction. To aim.

Another object of the present invention is to provide a tangential direction control system for a tool shaft which can always supply cutting oil from the same direction as the traveling direction of a cutting tool.

[0007]

According to the present invention, in order to solve the above problems, in a tangential direction control system of a tool axis for controlling a tool so that the tool always faces a tangential direction with respect to a traveling direction, a movement amount is pulse-distributed. A tool axis characterized by comprising: a pulse distributing means for processing to obtain an axis pulse; and a tangential direction computing means for obtaining a tangential direction with respect to a traveling direction of the tool based on the axis pulse and instructing the tool axis. A tangential control scheme is provided.

Further, instead of the tool shaft, the coolant mounting shaft is always controlled in a tangential direction with respect to the traveling direction of the tool.

[0009]

The pulse distribution means performs the pulse distribution processing on the movement amount to obtain the axis pulse. The tangential direction calculation means obtains a tangential direction with respect to the traveling direction of the tool based on the axis pulse, and instructs the tool axis. Therefore, the blade surface of the tool always faces the tangential direction to the traveling direction. Therefore, hail processing or the like can be performed smoothly.

Further, since the coolant mounting shaft is controlled so as to always face the tangential direction with respect to the traveling direction of the tool, the cutting oil supply port always faces the tangential direction with respect to the traveling direction of the tool. Therefore, the cutting oil can be jetted accurately to the cutting surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a tangential direction control system for a tool shaft according to the present invention. In the figure, the table 1 is moved in a predetermined axial direction by servomotors 3 and 4. That is, the servo motor 3 rotates the ball screw 31 to position the table 1 in the X direction, and the servo motor 4
Rotates the ball screw 41 to position the table 1 in the Y direction.

On the other hand, the spindle motor 2 has a spindle head (tool shaft) 2 through a gear mechanism (not shown).
Rotate 1. A tool 22 is fixed to the spindle head 21, and the tool 22 processes the work 11 fixed on the table 1. At that time, the blade surface 220 of the tool 22 is controlled so as to always face the tangential direction 112 with respect to the traveling direction (path) 111 of the tool 22. The details will be described later.

A CNC (Numerical Control Unit) 6 controls the rotation of the servomotors 3, 4 and the spindle motor 2. CN
The pulse distributing means 61 of C6 has designated coordinate values X and Y.
Pulse distribution processing, and the resulting axis pulse ΔX,
A signal corresponding to ΔY is sent to the servo motors 3 and 4 to control the rotation of the servo motors 3 and 4. When the pulse distribution processing is other than linear interpolation, that is, when circular interpolation is used,
The pulse distribution means 61 sends the axis pulses ΔX and ΔY to the tangential direction calculation means 62. The tangential direction calculation means 62 determines the traveling direction 11 of the tool 22 based on the axis pulses ΔX and ΔY.
The angle (tangent angle) θ formed by 1 and the tangential direction 112 is obtained, and the tangent angle θ is output to the spindle motor 2.
The tangent line angle θ is calculated by the following equation (1).

Θ = a · tan (ΔY / ΔX) ... (1) The spindle motor 2 rotates by its tangent angle θ. Therefore, the blade surface 220 of the tool 22 is controlled so as to always face the tangential direction 112 with respect to the traveling direction 111. Therefore, it is possible to smoothly perform processing such as hail processing in which the blade surface 220 faces the tangential direction.

FIG. 2 is a flowchart of the tangential direction control system for the tool shaft according to the present invention. The numbers following S in the figure represent step numbers. [S1] It is determined whether pulse distribution is performed by other than linear interpolation. If other than linear interpolation, the process proceeds to step S2, and if not, the process proceeds to step S4. [S2] The axis pulses ΔX and ΔY are obtained. [S3] Based on the axis pulses ΔX and ΔY, the above equation (1)
The tangent angle θ is obtained from This tangent line angle θ is output to the spindle motor 2 as described above. [S4] It is determined whether or not the pulse distribution process is completed. If it is ended, this program is ended as it is, otherwise, the process returns to step S1.

FIG. 3 is a diagram showing a second embodiment of the present invention. In the figure, the cutting oil supply port 22A is fixed to a coolant mounting shaft (spindle head) 21A, and the cutting oil 23 is supplied to the cutting surface 11A of the tool 22B from the cutting oil supply port 22A. At that time, the cutting oil supply port 22A
Is controlled to be tangential to the traveling direction (path) 111A of the tool 22B, as in the case of the tool 22 of the first embodiment.

FIG. 4 is a view showing the jetting direction of cutting oil.
As shown in the figure, the cutting oil supply port 22A moves along with the tool 22B along the traveling direction (path) 111A of the tool 22B, and its direction is always tangential to the traveling direction 111A. Is controlled to rotate. Therefore, no matter what route the tool 22B follows, the cutting oil can always be applied to the tool 22B from the same direction 111B as the traveling direction 111A. Therefore, the cutting oil can always be jetted accurately to the cutting surface 11A.

[0018]

As described above, in the present invention, the tool is always tangentially controlled so as to be tangential to the traveling direction. Therefore, it is possible to smoothly perform the hail processing or the like performed with the blade surface of the tool facing the tangential direction.

Further, the coolant mounting shaft is always controlled in a tangential direction with respect to the traveling direction of the tool. Therefore, the cutting oil supply port always faces the tangential direction with respect to the traveling direction of the tool. Therefore, the cutting oil can be jetted accurately to the cutting surface.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a tangential direction control system for a tool shaft according to the present invention.

FIG. 2 is a flowchart of a tangential direction control system for a tool shaft according to the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a jetting direction of cutting oil.

[Explanation of symbols]

 1 Table 2 Spindle Motor 3, 4 Servo Motor 6 CNC 11 Work 11A Cutting Surface 21, 21A Spindle Head (Tool Axis) 22, 22B Tool 22A Cutting Oil Supply Port 61 Pulse Distributing Means 62 Tangent Direction Calculating Means 111 Moving Direction (Path) 112 tangential direction 220 blade surface

Claims (2)

[Claims] 1. A tangential direction control system for a tool axis for controlling a tool so as to always face a tangential direction with respect to a traveling direction, and a pulse distributing means for performing a pulse distribution process on a movement amount to obtain an axis pulse; A tangential direction computing means for determining a tangential direction with respect to the traveling direction of the tool based on the above, and instructing the tool axis. 2. The tangential direction control method for a tool shaft according to claim 1, wherein the coolant mounting shaft is controlled in a tangential direction with respect to the traveling direction of the tool instead of the tool shaft.