JPH0367823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a 4-axis controlled NC having two turrets.
The present invention relates to a method for correcting the X-axis origin of the other tool rest using one sensor provided on one tool rest in a lathe.

Prior art In order to measure the workpiece using the spindle center as a reference, as in the conventionally known radius measurement method, for example, as in Japanese Patent Publication No. 49-1151, a reference ring gauge is installed concentrically with the spindle, and the X of the tool post is The axis origin was corrected.

Problems to be Solved by the Invention Normally, even if there are two turrets, the sensor is attached only to the first turret due to cost reasons, and the sensor is attached to only the first turret to correct the origin of the first turret, and the sensor is attached to the second turret. Both have been revised. For this reason, the origin of the second tool rest was not accurately corrected, which was a problem.

Means for solving the problem The diameter of a reference ring gauge 4 installed coaxially with the center of the spindle is measured by a sensor 10 installed in the first tool rest 5, and the X-axis origin A of the first tool rest is determined by calculation. The X-axis direction reference plane 11 of the second tool rest 8 is measured by the sensor 10, and the X-axis origin B of the second tool rest is determined from the difference between this measured value and the origin A of the first tool rest. .

Embodiments Examples of the present invention will be described below with reference to the drawings. A chuck 3 is fitted to the tip of a main spindle 2 rotatably supported on a headstock 1 of a well-known NC lathe that is simultaneously controlled with four axes, and a reference ring 4 is specially held concentrically at the center of this chuck 3. It is becoming more and more common. On the bed, there is an X on the back side of the main shaft center.
The first turret 6 has a turret 6 whose movement is controlled in the Z-axis direction.
In addition to the tool rest 5, a second tool rest 8 having a turret 7 and corresponding to the first tool rest 5 is placed on the bed in front of the center of the spindle and is controlled to move in the X and Z axis directions. A touch sensor 10 having a feeler 9 capable of measuring the inner diameter of the reference ring 4 and having detection capability in the +-2 directions of the X-axis is attached to one tool mounting surface of the turret 6 of the first tool post 5. Further, a reference surface 11 of the second tool rest parallel to the spindle axis is formed on one surface of the second tool rest 8 from which the turret can be indexed.

Operation When continuous operation is affected by changes in environmental conditions, the machining of the workpiece is interrupted, first the turret 6 is rotated, the touch sensor 10 is indexed to the machining position, and the first tool rest 5 is moved along the X and Z axes. The feeler 9 of the touch sensor 10 is positioned in front of the chuck at point A, which is approximately at the center of the main axis, by controlling the position. Next, the feeler 9 is positioned at point B approximately in the center of the reference ring 4 by -Z axis control. Next, +X-axis control is performed to bring the feeler 9 into contact with the inner diameter of the reference ring 4, and that position is set as point C. The X-axis feed is stopped by a touch signal, and the current position of the X-axis is read and memorized. Next, the feeler 9 is brought into contact with the reference ring 4 on the opposite side of the inner diameter by controlling it in the -X axis direction, and its position is adjusted to D.
point, stop the X-axis feed with a touch signal, and read and store the current position of the X-axis. Thereafter, +X-axis control is performed to position the point B, and +Z-axis control is performed to position it at a position E facing the turret 7 of the second tool post 8. At this point or before, the turret 7 of the second tool post 8 is rotated so that the reference surface 11 is connected to the touch sensor 10.
Find a position where you can face it. Next, the feeler 9 of the touch sensor 10 is controlled by controlling the -X axis of the first tool rest.
is brought into contact with the reference surface 11, this position is set as F, and the X-axis feed is stopped by the touch signal, and the
Read and store the current value of the axis. That is, the position of the second tool rest with respect to the first tool rest 5 is determined. Among these stored values, the calculation of (current value of C + current value of D)/2 is performed in the NC device, and the origin A of the first tool rest 5 is determined from this value. Next, this (current value of the origin A-F) is calculated to determine the origin B of the second tool post. Origins A and B obtained in this way
This is to correct the original origin of the first and second tool rests.

Effects As detailed above, the present invention uses a touch sensor provided on the first tool post of a dual tool post to touch the inner diameter of the reference ring provided concentrically with the chuck, and a touch sensor provided on the second tool post on the reference surface using NC control. The first value is calculated based on the current value of the
Since the origin of each of the turret and the second turret is determined, one touch sensor is sufficient and the origin of the second turret, where no touch sensor is not attached, can be made as accurate as the first turret without increasing the cost. It is possible to obtain the same accuracy and origin correction for both, which has the effect of enabling highly accurate workpiece measurement even during long-time operation.

[Brief explanation of drawings]

FIG. 1 is a measurement explanatory diagram, and FIG. 2 is a diagram showing the flow of origin correction. 3...Chuck, 4...Reference ring, 5...First tool post, 8...Second tool post, 10...Touch sensor, 11...Reference surface.

Claims (1)

[Claims] 1 In an NC lathe that has two tool rests whose positions are controlled independently, the diameter of a reference ring gauge installed coaxially with the center of the spindle is measured by a sensor installed on the first tool rest, and the diameter of the reference ring gauge installed coaxially with the center of the spindle is calculated. Determine the X-axis origin A of the table, measure the X-axis direction reference plane of the second tool post using the sensor, and combine this measurement value with the first
A method for correcting the origin of a tool post of a 4-axis controlled NC lathe having two turrets, characterized in that the X-axis origin B of a second tool post is determined based on the difference from the origin A of the tool post.