JPS62274202A - Laser measuring instrument for nc lathe - Google Patents

Abstract

PURPOSE:To take an accurate measurement which has no error by providing a laser length measuring instrument and an electronic computer which calculates the radial size and lateral size of an object of measurement from measured values based on the input signal of a touch sensor. CONSTITUTION:The touch sensor 12 is brought into contact with the reference point of a rotating body and a cutter base 10 is moved to bring the sensor 12 into contact with a measurement point of the rotating body; and the movement distance of the base 10 is measured with a laser beam from a laser light source 15 which is divided into two axes by optical equipment 18 for laser length measurement and the measured value is sent to a minicomputer 22 through a counter 19 to calculate the axial size of the rotating body. Further, when the radial size of the rotating body is calculated, the sensor 12 is brought into contact with the reference point and then the quantity of projection of an arm 13 for measurement is varied to bring the sensor 12 into contact with a measurement point of the rotating body; and variation in the quantity of projection of the arm 13 is measured with the light beam from the laser light source 16, and the computer 22 calculates the size. Consequently, an accurate, wide- range measurement is take without depending upon the sensation of an operator and measured values are read and recorded automatically by the touch sensor, electronic computer, etc.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention <Industrial Application Minute Hand> The present invention is applicable to large-sized rotating machines such as commercial steam turbine rotors, generator and prime mover rotors that are machined using large-scale NC lathes. The present invention relates to a laser measuring device used for measuring body dimensions.

<Prior art> Conventionally, the dimensions of large rotating bodies such as steam turbine rotors have been measured manually using a micrometer or using a linear scale (
This was done using a method using an inductosin scale, optical scale, etc.) and a dial gauge.

fn's method (method using a micrometer) is the fourth
As shown in the figure and FIG.
The radial dimension is directly measured using an outside micrometer 2 suitable for the measurement diameter, and the axial dimension is measured using an inside micrometer 4 after positioning using a magnet stretch 3. On the other hand, the latter method (method using a linear scale) is effective in cases where a micrometer cannot be used, such as when the outer diameter of the rotating body 1 is extremely large or when there are large steps at the measurement point in the axial direction. As shown in Fig. 6, the axial dimension of the rotating body 1 is measured by reading the position of the tool rest 5 with a linear scale 7 while positioning it with a dial gauge 6 attached to the tool rest 5 of the NC lathe. be.

<Problems to be Solved by the Invention> The conventional measurement methods described above each have the following problems.

Measurement using a micrometer: (1) The size of the micrometer increases depending on the size of the target object, and it takes a lot of effort to handle it.

(2) Since the contact level of the micrometer probe depends on the operator's touch, measurement errors are likely to occur.

(3) Measurement errors are likely to occur depending on how the magnet stretch is installed.

(4) Measurement is impossible if the object to be measured is large, with a total length of several meters.

Furthermore, in measurement using a linear scale installed on an NC lathe, (1) the direction of measurement must be taken into consideration when positioning with a dial gauge, which requires a lot of time;

+21 Since the linear scale of the NC lathe is installed relatively far from the measuring point of the object to be measured, measurement accuracy may be affected by errors caused by twisting or tilting of the tool post (Mappe error) or bending of the sliding bed. is greatly affected.

(3) Since measurement is performed according to the same standards as for processing using an NCi board, it is not possible to perform a dimensional check function in a strict sense.

The present invention was made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide a laser measurement device that rationally solves the above-mentioned problems.

Means for Solving the Problems> A laser measurement device for an NC lathe according to the present invention includes a measurement arm provided on a tool rest of the NC lathe, and a measurement arm provided at the tip of the measurement arm and attached to the NC lathe. A touch sensor attached to the object to be measured and a laser sensor for measuring the amount of protrusion of the measuring arm, the moving distance of the turret in the axial direction of the object to be measured, and the straightness of the turret. The measuring device is characterized by comprising a length instrument and a computer that calculates the radial dimension and axial dimension of the object to be measured from the measurement value by the laser length measuring device based on the input signal of the touch sensor.

<Operation> The radial dimension of the object to be measured is determined by measuring the amount of protrusion of the measurement arm from the reference point in the radial direction of the object to the point where the touch sensor touches the measurement point using a laser length measuring device. 3 Calculate using @ machine. On the other hand, the axial dimension of the object to be measured is calculated by a computer by measuring the travel distance of the tool post from the reference point in the axial direction of the object to the point where the touch sensor touches the measurement point using a laser length measuring device. and ask. If the turret is twisted or tilted, errors will be included in the amount of protrusion of the measuring arm and the moving distance of the turret. Correct from degree.

Example of implementation An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1 showing the overall configuration of the laser measurement device, lO
t, tNc This is an NC lathe turret, and this tool rest 10 can move on a sliding bed 11 in the direction of arrow X. The turret 10 is provided with a measuring arm 13 having a touch sensor 12 at its tip, and this measuring arm 13 can be extended in the direction of the arrow Y perpendicular to the direction of the arrow X by the operation of a motor 14. There is. At a position facing the tool post 10 is a laser length measuring device main body 20 that includes three laser light sources 15, 16, 17, a plurality of laser length measuring optical devices (mirrors, half mirrors, prisms, etc.) 18, and a counter 19. A laser length measuring device is constructed by a plurality of laser length measuring optical devices (mirrors, mirrors, prisms, etc.) 21 provided on the tool rest 10 and the measuring arm 13 and a laser length measuring device main body 20. It consists of A minicomputer (computer) 22 is connected to the counter 19, and calculates the dimensions of the object to be measured from the measured values of the laser length measuring device.

Next, a measurement operation using the laser measurement device described above will be explained.

To measure the axial dimension of the rotating body 30, which is the object to be measured, as shown in FIG. This is done by bringing the rotating body 30 into contact with the point to be measured (measurement point). The laser beam divided into two axes by the laser length measuring optical device 18 [ 15
Measure the distance traveled. This measured value is the touch sensor 12
At the moment the abuts on the measurement point of the rotating body 30, the counter 19 sends it to the mini-computer 22, and the axial dimension a of the rotating body 30, which is installed parallel to the moving direction of the tool rest 10, is calculated.

Here, if the turret 10 is twisted during movement and Mappe error δ occurs, a difference will occur between the readings of the laser beam divided into the two axes, and this difference will be explained later. The error δ is corrected by calculation by the minicomputer 22 based on the amount of protrusion of the measurement arm 13.

On the other hand, to measure the radial dimension of the rotating body 3G, as shown in FIG. After touching the touch sensor 12 to the reference point of the rotating body 30, the protruding amount of the measurement arm 13 is changed and the measuring point of the rotating body 30 is touched. This is done by bringing the sensor 12 into contact with it. Then, a change in the amount of protrusion of the measuring arm 13 is measured using a laser beam from the laser light source 16, and the radial dimension φA+2b of the rotating body 30 is calculated from this measured value by the minicomputer 22 in the same manner as described above. Here, if the sliding bed 11 is curved and this curve amount C is included in the above calculation value, from the curve amount (straightness) C measured by the laser beam from the laser light source 17, The minicomputer 22 corrects the calculated value. Furthermore, here, the rotating body 30
The diameter of the measuring point (φA+b+b') is obtained by rotating the , and taking the same measurement as above at the diagonal position, and by adding the difference b' in the radius between the reference point and the measuring point and the above radius.
A more accurate measurement can be achieved by calculating .

Incidentally, since the optical axis of the laser beam is set at the same height as the reference point and the measurement point, there is no error caused by the inclination of the tool post lO as in the conventional case.

In addition, in order to eliminate errors due to time delays in transmission and reading of signals between the touch sensor 12 and the laser length measuring device and mini-computer 22, the touch sensor 12 uses the measurement value holding function of the counter 19. A trigger signal from the touch sensor 12 causes the measured value of the measurement point to be held, and a trigger signal from the touch sensor 12 causes the minicomputer 22 to hold the measured value.
If you issue a read command to , you can reliably read more accurate measured values.

<Effects of the Invention> According to the laser measurement device for an NC lathe according to the present invention, accurate and wide-range measurement can be realized without relying on the operator's senses.

Furthermore, compared to the conventional measurement method using a linear scale equipped on a lathe, since the laser beam is set closer to the measurement point, accurate measurement without errors can be achieved.

Furthermore, by adopting touch sensors, computers, etc., reading and recording of measurement values can be automated, and the number of man-hours for measurement work can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a laser measuring device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram illustrating axial dimension measurement work, and FIG. 3 is a conceptual diagram illustrating radial dimension measurement work. figure,
FIGS. 4 and 5 are conceptual diagrams showing measurement work using a conventional micrometer, and FIG. 6 is a conceptual diagram showing measurement work using a conventional linear scale. In the drawing, 101 is a tool rest, 12 is a touch sensor, 13 is a measuring arm, 15, 16, 17 are laser light sources, 18, 21 is an optical device for laser length measurement, 22 is a minicomputer, and 30 is a rotating body. be. Figure 2

Claims (1)

[Claims] a measurement arm provided on a tool post of an NC lathe; a touch sensor provided at the tip of the measurement arm and capable of contacting a measurement object attached to the NC lathe; and a protrusion amount of the measurement arm; a laser length measuring device that measures the moving distance of the tool post in the axial direction of the object to be measured and the straightness of the tool post; A laser measuring device for an NC lathe, comprising a computer that calculates radial dimensions and axial dimensions of an object to be measured.