JP2790809B2 - Contour copying method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour copying method, and more particularly to a contour copying method when a model is provided on an inclined surface or when a model has an inclined contour shape. .

<Prior Art> The contour profiling is controlled by using the three-dimensional displacement of the stylus (output from the tracer head TRH) so that the stylus STL moves along the contour of the model MDL as shown in FIG. At the same time, the workpiece is processed according to the model shape by moving the cutter following the stylus.

By the way, in the conventional contour copying, a contour line having a constant height in the Z-axis direction is copied, and thereafter, the stylus is pick-fed in the Z direction, and thereafter, the same contour contour contouring and pick-feed are repeated to copy a three-dimensional shape. Was to do.

<Problem to be Solved by the Invention> However, in the conventional contour copying method, as shown in FIG. 5, when the model MDL is disposed on an inclined surface ICS that forms a predetermined inclination angle θ with a horizontal plane, With a single contour contour command (contour contour contour), contour contour processing of the entire model could not be performed.

Note that, besides the case where the model is arranged on an inclined surface, the case where the model is arranged horizontally when there is an inclined contour shape part ICPT in the model MDL as shown in FIG. However, contour profiling could not be performed.

In view of the above, it is an object of the present invention to perform contour contouring parallel to an inclined surface, which enables contour contouring even when a model is present on an inclined surface or even when an inclined contoured portion is present on the model. Is to provide a way.

<Means for Solving the Problems> FIG. 1 is a schematic explanatory view of the present invention.

MDL is a model, STL is a stylus, TRH is a tracer head, ICS is an inclined surface, θ is an inclined angle of the inclined surface in the X direction with respect to the horizontal plane, and ψ is an inclined angle of the inclined surface in the Y direction with respect to the horizontal plane.

<Function> Inclined surface IC with known inclination angles θ and の in X and Y directions
With respect to the model MDL (ψ = 0 in FIG. 1 (b)) existing on S (FIG. 1 (a)), the amount of movement L in the X and Y directions for each predetermined time moved during contour scanning _X, the following equation L _Z = L by _{X · tanθ + L Y · tanψ} , Z -axis movement required to along the inclined edge portion ICPT model MDL stylus STL moves with L _Y and the inclination angle theta, [psi The amount _LZ is calculated, contour contour control is performed with respect to the X and Y axes based on the detection signal of the tracer head, and contour control of the model is performed by performing control for _LZ movement in the Z-axis direction.

<Embodiment> FIG. 2 is a block diagram of a system embodying contour copying according to the present invention.

Reference numeral 10 denotes an operation panel for setting various data necessary for contour copying and inputting an X-direction inclination angle θ and a Y-direction inclination angle に 対 す る with respect to the horizontal plane of the inclined surface ICS (FIG. 1A).

Reference numeral 11 denotes a contour profiling control device, and the profiling operation circuit 11a and the Z
And a movement amount calculating circuit 11b for calculating the movement amount L _Z direction.

The profiling operation circuit 11a performs a well-known contour profiling operation using the three-dimensional displacement amounts ε _X , ε _Y , ε _Z of the stylus output from the tracer head TRH, and performs velocity commands V _X , V in each axis direction of the XY plane. Generate _Y. The movement amount calculation circuit 11b uses the movement amounts L _X and L _{Y in the X} and _Y axes at predetermined time intervals and the inclination angles θ and に お け る in the respective axis directions of the inclined surface ICS to move in the Z axis direction at predetermined time intervals. L _Z is calculated by the following equation _{L Z = L X · tanθ +} L Y · tanψ (1) a.

12X, 12Y, servo amplifier for 12Z is to amplify the analog velocity command V _X, V _Y, the V _Z, 13X, 13Y, 13Z is the X-axis, Y-axis and Z-axis motor, 14X, 14Y, 14Z is a motor A pulse coder (pulse generator) that generates pulses P _X , P _Y , and P _Z every time the motor rotates a predetermined amount, and 15X, 15Y counts the pulses P _X , P _Y generated from the pulse generators 14X, 14Y, respectively. A counter 16 generates the axis movement amounts L _X and L _Y at predetermined time intervals. Reference numeral 16 denotes a position control unit that moves the stylus in the Z direction.

Hereinafter, the contour copying method according to the present invention will be described with reference to FIGS.

Data necessary for contour profiling is set from the operation panel 10, and an X-axis directional inclination angle θ and a Y-axis directional inclination angle に 対 す る with respect to a horizontal plane (XY plane) of the inclined surface ICS are input to start contour profiling. Note that, in practice, the angle tangent of θ, θ tan θ, tan
ψ is also calculated.

The start of the contour tracing, copying operation circuit 11a generates X, Y velocity command V _X for each axis, a V _Y by performing a well-known contour tracing operation. The speed command V _X, motor by V _Y 13X, stylus STL rotates and 13Y moves along the inclined contour ICP model MDL (Fig. 1 (b)). When the motor rotates, the pulses P _X and P _Y are generated from the pulse generators 14X and 14Y,
The pulses are counted by the counters 15X and 15Y, respectively.
As a result, the movement amount of each axis is stored in the counter.

More contour scanning control in parallel with the moving amount calculating circuit 11b counter 15X every predetermined time, the count value from the 15Y (movement amount for each predetermined time) L _X, read the L _Y, L _X, L _Y and tilt angle θ,
Using the tangent tan θ of ψ, tan θ, tan に よ り, the Z-axis movement amount L _{Z at} every predetermined time by equation (1), in other words, the Z-axis movement amount necessary to move along the contour of the model MDL on the inclined surface to calculate the L _Z.

Thereafter, the position control unit 16 carries out a well-known position control so as to L _Z moving the stylus entered the Z-axis movement amount L _Z in the Z direction. Then, in parallel with the position control in the Z direction, contour profiling control is performed by the profiling operation circuit 11a, and contour profiling parallel to the inclined surface is performed.

That is, with respect to the X and Y axes, contour tracing control based on the detection signals ε _X , ε _Y and ε _Z of the tracer head is performed, and
With respect to Z-axis scanning contour position control to move L _Z is along the performed inclined shape ICPT) is performed.

Each time one cycle of contour scanning is completed, a pick feed command (not shown) in the Z direction is input to the position control unit 16, and the stylus STL is pick fed in the Z direction. The movement in the X and Y directions is also monitored during the pick feed, and the LZ value obtained by the above (1) is superimposed in the pick feed direction (Z direction) to keep the pick width constant.

FIG. 3 is a block diagram of another embodiment of contour contouring according to the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals.

In the embodiment of FIG. 2 calculates the Z-direction movement amount L _Z for each predetermined time, but were those for L _Z moves in the Z direction in parallel with the contour scanning control of XY, in the embodiment of Figure 3 XY contour scanning X obtained by the calculation, the speed command V _X in the Y-axis direction, the inclination angle of V _Y each axial theta, calculates a speed command V _Z of the Z-axis direction by using the [psi, V _X performs a copying inclined contour by driving each axis motor by V _Y, V _Z.

Now, FIG. 3 differs from FIG. 2 in that (i) digital speed commands V _X , V _Y from the copying operation circuit 11a.
(Ii) a speed calculation circuit 11c is provided, and the speed commands V _X , V _{Y in the X} and _Y axis directions and the inclination angle θ in each axis direction of the inclined surface ICS,
following equation Z-axis velocity command V _Z using _{ψ V Z = V X · tanθ} + V Y · tanψ (2) are calculated by, (iii) digital velocity command V _X for each axis, V _Y is that the DA converter 17X for converting the V _Z to the analog, 17Y, 17Z are provided. The operation of the embodiment of FIG. 3 will be described below with reference to FIG.

Data necessary for contour profiling is set from the operation panel 10, and the X-axis direction inclination angle θ and the Y-axis direction inclination angle に 対 す る of the inclined surface ICS (FIG. 1 (a)) with respect to the horizontal plane are set and input to start. . Within 11c, tangents tanθ and tanψ of θ and ψ are also calculated.

The start of the contour tracing, copying operation circuit 11a performs known contour tracing operation X, Y velocity command V _X for each axis, a V _Y digitally generated.

Speed computing circuit 11c speed command V _X, each time the V _Y is input, V _X, V _Y, and the inclination angle theta, tangent of [psi tan .theta, Z-axis velocity command V _Z by using tan (2) formula, In other words, the speed command VZ in the _Z- axis direction necessary for moving the stylus along the contour of the model MDL on the inclined surface is calculated.

Thereafter, the speed command V _X for each axis, V _Y, V _Z is the DA converter
17X, 17Y, converted to analog at 17Z, the speed command V _X of the analog, V _Y, motor by V _Z 13X, 13Y, stylus STL 13Z is rotated to move along the inclined portion ICPT model MDL. When each axis motor rotates, each pulse generator 14X,
Pulses P _X , P _Y , and P _Z are generated from 14Y and 14Z, and the pulses are captured by the contour copying control device 11 and integrated to monitor the position.

From the above, contour tracing control based on the detection signals ε _X , ε _Y , ε _Z of the tracer head is performed for the X and Y axes, and
The inclination angle θ with respect to the Z-axis, the scanning movement controlled by the command speed V _Z corresponding to ψ is along conducted inclined shape is performed. In addition, according to the method shown in FIG. 3, since there is no delay in the Z-axis direction, a contour parallel to the inclined surface can be accurately formed. In the method of FIG. 2, the movement in the Z direction is delayed by the sampling time.

<Effects of the Invention> As described above, according to the present invention, contour tracing control based on the detection signal of the tracer head is performed for the X and Y axes, and the Z and Y direction movement amounts L at predetermined time intervals due to contour tracing are performed for the Z axis.
_X, L _Y and model outline of the X, the inclination angle of the Y-direction theta, using ψ to calculate the movement amount L _Z in the Z direction, because I configured to perform position control for L _Z moves in the Z direction, Even when the model is provided on the inclined surface as shown in FIG. 5, or when the model itself has an inclined contour shape as shown in FIG. 6, contour copying can be performed. Processing efficiency can be improved.

Further, according to the present invention, X obtained by the contour copying operation
Speed commands V _X , V _{Y in the X-} axis and Y-axis directions and X,
Speed command V _{Z in the} Z-axis direction using the inclination angles θ and の in the Y direction
Is calculated and each axis motor is controlled by V _X , V _Y , and V _Z. Therefore, even if the model is arranged on the inclined surface, the model itself has an inclined contour shape. In this case, the contour processing can be performed efficiently, and the command speed in the Z direction can be generated simultaneously with the command speed in the X and Y directions, so that there is no time delay and contour contour parallel to the inclined surface can be accurately performed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of the present invention, FIG. 2 is a block diagram of a contour copying system embodying the present invention, FIG. 3 is a block diagram of another contour copying system of the present invention, and FIGS. The figure is a background explanatory diagram of the present invention. MDL …… Model, STL …… Stylus, TRH …… Tracer head, ICS …… Slope

Claims (4)

(57) [Claims] 1. A contour copying method for a contour control device for contouring a model shape by calculating a feed rate of each of X and Y axes from a detection signal of a tracer head, wherein a θ and a Y direction in an X direction with respect to an XY plane. When contour profiling is performed on a model having a ψ slope, contour profiling control based on the detection signal of the tracer head is performed for the X and Y axes, and the amount of movement in the X and Y axis directions for the Z axis. To monitor the X, Y direction movement amount and the inclination angle θ every predetermined time,
It calculates the amount of movement L _Z in the Z direction using the [psi, parallel contour profiling method inclined surface and performing control to L _Z moves in the Z direction. 2. The movement amounts in the X and Y axis directions at predetermined time intervals are represented by L _X and L _Y.
When a, the movement amount L _Z for a predetermined time per Z-axis direction _{L Z = L X · tanθ +} L Y · tanψ by copying the contour parallel to the inclined surface of the claims paragraph 1, wherein the calculating Method. 3. A contour profiling method in a profiling control device for performing contour profiling of a model shape by calculating a feed speed of each of X and Y axes from a detection signal of a tracer head. When contour contouring is performed on a model having a tilt angle of, the velocity commands V _X , V _Y in the X-axis and Y-axis directions obtained by contour contouring calculation and the inclination angles θ, ψ are used, and the Z-axis direction is used. of calculating a speed command _{V Z, V X, V Y} , parallel to the contour tracing method to the inclined surface, characterized by controlling each axis motor by V _Z. 4. When the speed commands in the X and Y axis directions are V _X and V _Y ,
How the copying contour parallel to the inclined surface of the claims third term, wherein the Z-axis velocity command V _Z is calculated by _{V Z = V X · tanθ +} V Y · tanψ.