JPH06201312A - Controlling method for touch probe - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a control method of a touch probe that outputs a measurement command to bring the touch probe into contact with a workpiece in an optimal direction. [Structure] After the shape is determined by the interactive automatic program, the work W is processed and the touch probe P of the work W is processed.
The measurement direction and the measurement point are designated, and the measurement point and the work shape measurement are evaluated to measure each measurement point Pn, Pn-1, Pn.
The control method of the touch probe measures and determines the shape of the work by determining and controlling the optimum touch probe direction θn at -2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch probe control method for outputting a measurement command to bring a touch probe into contact with a workpiece in an optimum direction.

[0002]

2. Description of the Related Art Conventionally, for example, actual Kaihei 1-1640
As shown in No. 51 and FIG. 2, a vertical approach function part and a horizontal approach function part that perform the approach function until the stylus S is brought into contact with the model M in two stages of vertical and horizontal, and next to this approach function, three-dimensional A control device having a three-dimensional copying execution unit that executes copying has been proposed. In the approach up to contacting the model with the stylus, the stylus does not contact the model, and the touch probe does not contact the work piece from the optimum normal direction. There is a problem that incorrect shape data is taken in depending on the probe diameter and the like.

Therefore, as disclosed in JP-A-59-1424551, the axis center of the rotary support shaft and the center of the copying end portion of the stylus are offset so that the copying end portion comes into contact with the unevenness on the curved surface of the copying die. In some cases, the same end portion is configured to be swung along the uneven surface to improve the followability of the processing head. However, since the stylus has a constant tilting posture, it lacks the controllability of directing it to the correct normal direction with respect to any tilted surface of the model or workpiece.

Further, as disclosed in Japanese Patent Laid-Open No. 188254/1989, there is a device capable of non-contact copying digitizing even if a model inclination angle exceeds a limit value in either a traveling direction or a direction orthogonal to this direction. That is, "a method of digitizing model surface data while scanning the model surface with a distance measuring probe that can measure distance without contact, in which the optical axis of the distance measuring probe is tilted by an angle Θ from the vertical direction and The optical axis is configured to be rotatable around the vertical axis while maintaining Θ, and non-contact scanning is performed by inclining Θ from the vertical axis with respect to the traveling direction of the distance measurement probe. While stopping the movement of the measuring probe, check the distance measurement probe by rotating the optical axis of the distance measuring probe 90 ° around the vertical axis from the current position to check if distance measurement is possible. If possible, restart non-contact copying and measure distance. If this is not possible, it is a non-contact copying digitizing method in which the non-contact copying is restarted after further rotating by 90 °.

The above-mentioned non-contact copying digitizing method also lacks the controllability of directing it to the correct normal direction with respect to any inclined surface of the model or the workpiece. Further, in Japanese Patent Laid-Open No. 61-48711, a shaft on which a probe is attached is made rotatable in a predetermined plane parallel to the shaft, and a probe is used to move the work surface by the passage data. Calculate the angle of the workpiece normal direction using the data,
The angle data is used to direct the probe in the direction of the normal to the work. However, the posture control is limited to the two-dimensional plane of the X and Z axes. Therefore, it is desired to develop a control method of a touch probe that outputs a measurement command to bring the touch probe into contact with the work piece from the optimum three-dimensional direction.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to solve the problems.
A control method of a touch probe that outputs a measurement command to bring the touch probe into contact with a work piece in a three-dimensional optimum direction.

[0007]

According to the present invention, after a shape is determined by an interactive automatic program, a workpiece is machined, a measuring direction and a measuring point of the workpiece are designated by a touch probe, and the measuring point and the workpiece shape are measured. And controlling the optimum touch probe direction at each measurement point to measure the shape of the work, thereby controlling the touch probe. In addition, after the shape is determined by the interactive automatic program, the workpiece is processed, the measurement direction and measurement point of this workpiece are specified by the touch probe, and this measurement point and workpiece shape measurement are evaluated, and the optimum touch at each measurement point is made. The shape of the workpiece is measured by determining and controlling the probe direction.If the shape measurement is judged to be good, the process moves to the next process.If the shape measurement is judged to have a large margin, the error is automatically detected in the dialog. At the same time as adding to the program, a finishing tool is called on the spindle again to correct the work.On the other hand, when the shape measurement judgment is small, the correction value is input and given to the dialog automatic program, and at the same time the spindle is finished again. A touch probe characterized by performing a full correction to call a tool to correct and correct a workpiece, or a processing skip to move to the next process. Control method.

[0008]

According to the present invention, the controllability of directing the correct normal direction to any inclined surface of the model or the work piece is exerted, so that the touch probe is brought into contact with the work piece from the optimum three-dimensional direction. It acts as a control method of the touch probe that outputs a measurement command to perform the operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below. Figure 1
2 is a perspective view of a touch probe showing the method of the present invention, FIG. 2 is a perspective view of a touch probe showing the conventional method, FIG. 3 is a perspective view showing measurement points of the probe, and FIG. 4 is a flow chart showing machining and measuring method of a workpiece. It is a figure.

FIG. 1 shows the control for directing the touch probe P in the correct normal direction with respect to any inclined surface of the model or the workpiece. Therefore, a state is shown in which the touch probe functions as a control method of the touch probe that outputs a measurement command to bring the touch probe into contact with the curved surface serving as each measurement point of the workpiece W from the optimum directions θn and θo.

Next, a method of designating each measurement point of the touch probe P will be described with reference to FIG. In FIG. 3A, the surface of the workpiece W to be measured is measured at a measurement point P with a mesh (mesh) M at equal intervals.
Designate n, Pn-1, Pn-2, ... Further, in FIG. 3B, measurement points Pn, Pn-1, Pn-2, ... Are designated at arbitrary points on the surface of the workpiece W to be measured. The measurement points are measured by one of these designated methods, and FIG.
As shown in (b), the measurement points Pn, Pn-1, Pn-2.
.. Normal direction of work surface at .theta.o, .theta.1, .theta.2.
.. is measured. In this way, the touch probe P at each measurement point Pn, Pn-1, Pn-2 on the work surface
The optimum direction is designated, the shape of the entire work is measured, and it is determined whether the machined work has been corrected.

Next, a series of operations from "NC data creation for shape creation by an automatic professional to work machining, measurement, and correction" will be described with reference to a flowchart in FIG. The hardware configuration includes a known interactive automatic professional, a copying and NC control device, a machine tool, and a control system that corrects NC data, and illustration thereof is omitted. First, create "NC data" (b) of "create shape" (a) by interactive automatic professional, and "process"
Execute (c). On the other hand, "measurement direction, measurement point" (d) of the processed work shape is created from "shape creation" (a). "Measurement" (e) of the work surface shape is performed by this measurement direction and measurement point, and "judgment" of the work surface shape is performed.
Do (f).

Here, if "OK" is reached, the process moves to "screen shape display / plot" (G) and "machining of the next process" (K) and ends. Also, if you get "NG" with a lot of money,
Correct by adding "error to automatic professional" (ke), and
On the C side, the finishing tool is called again on the main spindle "(ko) to rework the work, and the above measurement and determination are repeated.

On the other hand, if "NG" occurs when the stock removal is small, a selection "correction" or "non-correction" is performed. If the correction cannot be made, "skip machining, warning""Display" (SI) is issued, the work is treated as a defective product, and the process moves to "Machining in the next process" (K). However, if it can be corrected, "Enter the correction value" (S) and press "N
The self-correction processing function is exerted by correcting "C data", reprocessing and then repeating the above measurement and determination.

It is needless to say that the present invention is not limited to the above-mentioned respective embodiments, and that design changes can be further made within the scope of the invention.

[0016]

[Effects] According to the present invention, the controllability of directing a correct normal direction to all inclined surfaces of a model or a work piece is exerted, and therefore, the touch probe is set to the work piece from an optimal three-dimensional direction. This is effective as a control method of a touch probe that outputs a measurement command to bring it into contact.

[Brief description of drawings]

FIG. 1 is a perspective view of a touch probe showing a method of the present invention.

FIG. 2 is a perspective view of a touch probe showing a conventional method.

FIG. 3 is a perspective view showing measurement points of a probe.

FIG. 4 is a flow chart showing a method of processing and measuring a work.

[Explanation of symbols]

 P Touch probe W Work θn Optimal direction of touch probe Pn, Pn-1, Pn-2 Each measurement point

Claims (2)

[Claims] 1. After the shape is determined by the interactive automatic program, the work is processed, the measurement direction and the measurement point of the work are specified by the touch probe, the measurement point and the work shape measurement are evaluated, and at each measurement point. A method for controlling a touch probe, characterized in that the shape of a workpiece is measured by determining and controlling the optimum touch probe direction. 2. After the shape is determined by the interactive automatic program, the work is machined, the measurement direction and the measurement point of the work are specified by the touch probe, and the measurement point and the work shape measurement are evaluated and at each measurement point. The optimum shape of the workpiece is measured by controlling the optimum touch probe direction, and if the shape measurement is judged to be good, the process moves to the next process.If the shape measurement is judged to have a large margin, the error is corrected. At the same time as giving to the dialogue automatic program, the finishing tool is called again to correct the work.On the other hand, when the shape measurement judgment is small, the correction value is input and given to the dialogue automatic program. Touch-up featured by calling a finishing tool to the main spindle to perform all modifications to correct the work, or to select a processing skip to move to the next process How to control the lobe.