JPH01240260A - Non-contact type digitizer - Google Patents

Abstract

PURPOSE:To eliminate biaxial control of a sensor head by providing a tracer head for detecting the position of one point in a measuring surface by providing at least two non-contact type sensors inclined before and after a motion direction at the optimum angles for receiving light or signal in parallel to the motion direction, and a digitization controller. CONSTITUTION:A tracer head 9 is installed at the forward end of a tracer head quil 7 for the X-axis direction, and two sensors A, B are provided at the optimum angles for receiving light provided in parallel to the Y-axis when the Y-axis of the motion direction of a main shaft head 6 is taken for the motion axis. A digitization controller 11 selects the sensor on the back side in the advancing direction among the sensors A, B when the surface form of a model 2 is flat in measuring an up inclined surface +DEF, and the sensor on the front side is selected for measuring a down inclined surface -DEF. The motion in the Z-axis direction for the quil 7 is controlled based on a sensor output on the selected side, and coordinates on the surface of the model 2 and a Z-axis speed are calculated based on coordinates for the Y-axis and Z-axis, thereby the form data by NC being formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a digitizer that digitizes model shapes and creates NC programs.

Conventional technology In optical sensors that irradiate an object with a beam of light from an infrared LED and then focus the reflected light onto a position detection element using a light receiving lens to output a signal, the detection element must be set at the optimal angle for light reception. Must be installed at an angle. This creates a shadow area, and a single sensor always has a dead zone, which limits the slope angle that can be measured. Conventionally, to solve this problem, the entire model shape was measured by controlling the sensor head on two axes to rotate the sensor head to change the inclination angle of the sensor, and to rotate the rotation plane to make it parallel to the direction of travel. I was trying to do it.

Problems to be Solved by the Invention The two-axis control method for the sensor head described in the prior art has the problems of complicated control, difficulty in increasing the scanning speed, and complicated data processing. Ta. The present invention has been made in consideration of these problems of the prior art, and its purpose is to provide a sensor with a vertical wall of ±900 mm, which does not require two-axis control.
The aim is to provide a digitizer that can measure all model shapes up to 0°.

Means for Solving the Problems In order to achieve the above object, the non-contact digitizer of the present invention includes at least two non-contact sensors tilted forward and backward in the direction of movement at an optimal angle for light reception or reception. A tracer head installed in parallel to detect the position of one point on the measurement surface, a sensor on the rear side with respect to the direction of travel when the old measurement surface is a flat or two-sided slope, and a sensor on the front side with respect to the direction of travel when it is a down slope. and a digitizing control device that selects a sensor and creates NC shape data based on scanning data based on an output signal of the sensor.

Further, the at least two optical sensors each detecting the positions of at least two points separated by a certain distance on the axis of movement may be combined so that the speed in hectors can also be calculated.

The tracer head is attached to the tip of the tracer head quill in the X-axis direction, and when the Y-axis in the direction of movement of the spindle head is used as the movement axis, the tracer head is tilted at an optimal angle for light reception, which is arranged parallel to the Y-axis. Of the two sensors 4, j-A, and B, the sensor on the rear side in the direction of travel is selected when the surface shape of the dry deck is flat and measures the upward slope +DEF, and also measures the downward slope ~DEF. In this case, the front sensor is selected. Then, the movement of the tracer head tile in the X-axis direction is controlled by the sensor output of the selected side, and each coordinate value and Z-axis speed of the model surface are calculated from the coordinate values of the Y-axis and Z-axis, and the shape data is generated by NC. create.

In addition, the two sensors mentioned above are separated by a certain distance from each other.
Two sensors A1 that simultaneously detect the positions of two points on the axis.
A2 or B1. B2 is selected, and when driving to the right, sensor B1 that detects the position on the front side in the direction of travel is selected, and when driving to the left, sensor A1 that detects the position on the rear side in the direction of travel is selected. It is combined when ±DEF is detected. Two sensors A1. The positions of two points are detected simultaneously at A2 or B1°B2, and a velocity vector is calculated.

Embodiment An embodiment will be described with reference to the drawings. 1st to 2nd
In the figure, a model table 3 on which a model 2 is attached is movably placed on a sliding guide surface in the X-axis direction cut into a head 1 in a well-known digitizer, and is controlled in the X-axis by NG. A rectangular column 4 is erected on both sides of the head 1, and a spindle head 6 is movably placed on a sliding guide surface in the Y-axis direction of a crossbeam 5 attached to the column 4.
The Y-axis is controlled by A tracer F coil 7 is provided on the spindle head 6 so as to be movable in the X-axis direction, and is controlled by an NC. The tracer head 9 attached to the tip of the tracer head quill 7 has two optical sensors A and B that are tilted back and forth in the X-axis direction at an angle θ that is optimal for light reception and detect the position of one point on the model. are installed in line in the Y-axis direction. Sensors A and B can be, for example, H3O65 type optical distance sensors manufactured by Hamamatsu Photonics Co., Ltd., which irradiate the object with a pulsed infrared LED light beam through a projection lens. The reflected light is focused onto a position detection element by a light receiving lens, and the controller calculates it based on the output position signal of the detection element, which corresponds to distance information to the target object, and outputs an analog voltage corresponding to the distance. It is. and a digitizer control device that controls the Z-axis so that the output voltage of sensor A or B is always a constant value (for example, zero volts) and creates NC shape data from the ever-changing scanning data of the moving axis and the tracer head tile. 11 is installed near the head.

Next, the scanning procedure will be explained with reference to the flowchart in FIG. In step S1, it is determined whether the moving direction of the spindle head 6 in the Y-axis direction is to the right, and if yes, in step S2, it is determined whether the displacement output DEF of the sensor is zero or greater than zero, and if yes, in step S3. , the measurement point on the model surface is a plane or an upward slope + D E F as shown in Figure 4, and the sensor 43B
is selected. If no, in step S4, it is a downhill slope -DEF and sensor A is selected. In step S1, if the direction of movement of the spindle head 6 is leftward, the result is NO, and in step S5, it is again determined whether DEF is zero or greater than zero, and if YES, step S6
In this case, the measurement point on the top surface of the model is a flat surface or an upward slope +DEF as shown in FIG. 5, and sensor A is selected. If no, in step S7, the downhill slope -DE
F, and Sen'IIB is selected.

Next, in step S8, it is determined whether there is an output signal from the selected sensor and this output data can be read. If no, in step S9, switching between sensors A and B is performed, and in step S10, sensor A or sensor B is switched. B is selected again, and in step 31.1 it is determined whether the output data from the sensor can be read. If NO, it is determined in step S12 whether the number of data readings is within the pre-input set number of data readings. If YES, step SIO is performed. Returning to step S13, if no, in step S13,
Return to the first measurement point and restart measurement. Then, in step S14, it is determined whether the number of returns is within the set value, and if YES, the process returns to step S10, and if NO, the alarm is stopped.

Step S8. If YES in Sll, the model surface coordinate values are calculated in step 31.5, and the deviation value DE between the previous and current data is calculated in step S16.
The slope angle is calculated from F, and in step S17,
Z-axis velocity is calculated.

Then, in step S18, tolerance processing is performed to process allowable errors, and in step S19, NC shape data is created, and in step S20, the data is stored. Then, the process returns to step S1 and one-dimensional scanning is performed by repeating the above steps. Next, the sixth
As shown in the figure, sensor A is equipped with two sensors A1 and A2, and sensor B is equipped with two sensors B1 and B2 so that it can simultaneously detect positions a and b separated by a certain distance in the Y-axis direction. is incorporated. Then, the sensors Al and B1 measure the a position, and the sensors A2 and B2 measure the b position, and the combination of AI, A2, Bl, and B2 detects the velocity in hectors.

Next, referring to FIG. 7, the sensor A1. A2゜Bl,
The scanning procedure using B2 will be explained.

The description of the same parts as those in the flowchart of FIG. 3 above will be omitted or simplified to avoid duplication.

In steps 81 to S7, sensor A or B is selected, and in step S8, it is determined whether sensor output data can be read. If NO, steps SIO to S14 are repeated until step Sll becomes YES, and the number of repetitions is The alarm will be stopped when exceeds the set number of times.

Step S8. If YES in Sll, it is determined in step S15 whether the selected sensor is A1, and if YES, in step S16, it is determined whether the selected sensor is A2.
is selected, and if no, sensor B is selected in step S17.

In this way, as shown in FIGS. 8 and 9, when the traveling direction is rightward or leftward, sensor A performs position detection using AI and sensor B uses B1, and hector detection is performed by sensor A1. A2 or a combination of B1 and B2 is selected. In step S18, it is determined again whether data can be read, and if no, the alarm is stopped; if yes, model surface coordinate values are calculated in step S19, and in step S20, sensor A2. AI or sensor B2. The slope angle is calculated from the deviation value DEF of the data of Bl, and in step S21, the velocity vector is calculated and the axis velocities of the Y-axis and the Z-axis are determined. In steps 822 to S24, tolerance processing is performed and NC data is created and stored, and then the process returns to step S1 and two-dimensional scanning is performed by repeating the above steps.

Note that the sensor is not limited to an optical non-contact sensor, but a non-contact sensor that uses ultrasonic waves or the like may also be used.

Effects Since the present invention is configured as described in detail above, it produces effects as described below.

In the non-contact digitizer according to claim 1, the tracer head is provided with two optical sensors tilted forward and backward in the direction of movement at an angle optimal for light reception, and one sensor out of the two is tilted in the direction of movement and in the direction of movement. Since the measurement is automatically selected according to the shape of the measurement surface, the tracer head is controlled on two axes to eliminate blind spots (shaded areas), which are the disadvantages of optical methods, and to measure ±906 mm including vertical walls. All shapes up to this point can be measured.

In the non-contact digitizer of claim 2, since the two sensors of claim 1 are configured to be capable of detecting the positions of two separate points, in addition to the effect of claim 1, the detection of velocity in hectares is also possible. This makes it possible to perform two-dimensional scanning at a smooth speed even for objects with unknown shapes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the digitizer, control device, and model of the present invention, FIG. 2 is an explanatory diagram showing the installation state of two sensors, and FIG. 3 is a flowchart diagram for explaining the operation of claim 1.
4 and 5 are diagrams explaining the selection conditions of the sensor in Figure 2, Figure 6 is an explanatory diagram showing the mounting state of the sensor for detecting the positions of two distant points according to claim 2, and Figure 7 is The flowchart for explaining the operation of claim 2, FIGS. 8 and 9 are explanatory diagrams of the selection conditions of the sensor of FIG. 6. A, A1. A2. B, B1. B2...Sensor 9...Tracer head 11...Digitizer control device

Claims (2)

[Claims] (1) Detect the position of one point on the measurement surface by installing at least two non-contact sensors (A, B) arranged parallel to the direction of movement and tilted back and forth in the direction of movement at the optimal angle for receiving or receiving light. A tracer head (9) that selects a sensor on the rear side in the direction of travel when the measurement surface is a flat surface or an upward slope, and a sensor on the front side in the direction of movement when the measurement surface is on a downward slope, and scans data based on the output signal of the sensor. by NC
A non-contact digitizer comprising a digitizing control device (11) for creating shape data, and capable of tracing a model shape up to ±90° including vertical walls. (2) The at least two optical sensors each have a velocity vector that is a combination of two sensors (A1, A2 and B1, B2) that detect the positions of at least two points separated by a certain distance on the axis of movement. 2. The non-contact digitizer according to claim 1, wherein the non-contact digitizer is also capable of calculating.