JPH05138506A - Rotary body copying control method - Google Patents

Abstract

PURPOSE:To realize the accurate copying control of a columnar or conical model such as a screw in the case of a rotary body copying control method that copies the surface of the model while the model is being rotated around a rotary axis. CONSTITUTION:A model 6 is rotated in an A axis direction with the Z axis of a tracer head 4 fixed, and kept on moving in an X axis direction from a start point PS. When the stylus 5 of the tracer head 4 comes to limit LXN or LXP, the pick feed of the tracer head 4 is made in a Z axis direction by a predetermined quantity, and with the Z axis of the tracer head 4 fixed at its position, the action of copying is conducted by turning the A axial rotation and the X axial movement of the model 6 to the opposite directional ones. Thus, the pick feed and the copying action are repeated thereafter, and when the stylus 5 of the tracer head 4 comes to a pint Pe that is beyond limit LZP, the whole cycle of the copying action is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body tracing control system that follows a model surface while rotating the model around a rotation axis, and particularly, a model surface while rotating a cylindrical or conical model such as a screw. The present invention relates to a control method for following a rotating body.

[0002]

2. Description of the Related Art Conventionally, when a cylindrical or conical model such as a screw is rotated to follow the model surface, two limits orthogonal to the A-axis, which is the axis of the model's rotation, are provided. The model surface was modeled only within a predetermined angle range between the limits.

Alternatively, there is also a system in which the tracer head is moved only in the X-axis direction without rotating the model, and only the undulation in the Z-axis direction along the X-axis is performed.

[0004]

However, since all of these methods follow only a part of the model surface,
There was a problem that the amount of data was insufficient and accurate tracing control could not be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating body tracing control system capable of accurately tracing a cylindrical or conical model such as a screw. And

[0006]

In order to solve the above-mentioned problems, the present invention relates to a rotating body tracing control system for tracing a model surface while rotating a model around a rotation axis, wherein a first parallel to the rotation axis of the model is used. 1 limit and two second limits that are orthogonal to the rotation axis and are spaced apart by a predetermined distance, and while rotating the model by a tracer head that maintains a fixed distance from the rotation axis. When the tracing operation of the model surface is executed and the tracer head reaches the second limit position, the pick feed operation is performed and the tracing direction is reversed by reversing the rotation direction of the model to continue the tracing operation. Until it reaches, the above-mentioned pick feed operation, the reversal of the rotation direction of the model, and the tracing operation are repeated. Method is provided.

[0007]

The function of tracing the model surface is executed while the model is being rotated by the tracer head whose distance from the rotation axis is fixed, and the pick feed operation is performed when the tracer head reaches the second limit position. The tracing operation is continued by reversing the rotation direction of the model, and the pick feed operation, the reversal of the rotation direction of the model, and the tracing operation are repeated until the first limit is reached.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of a digitizing control device that executes the rotating body tracing control system of the present invention. The processor 11 reads a system program stored in the ROM 12 via the bus 10 and controls the entire digitizing control device 1 according to the system program. The RAM 13 stores temporary data. The nonvolatile memory 14 is backed up by a battery (not shown), and the operation panel 2 is connected via the interface 15.
Various parameters such as the tracing direction and the tracing speed input from are stored.

The tracer head 4 provided in the tracing machine 3 has displacements ε of the X-axis, Z-axis and A-axis which are generated when the stylus 5 at its tip comes into contact with the model 6.
x, εz and εa are detected and input to the processor 11.

The processor 11 generates Vx, Vz, and Va of each axis based on these displacement amounts, the commanded tracing direction, and the tracing speed by a well-known technique. These speed commands are converted into analog signals by the D / A converters 16x, 16z and 16a, input to the servo amplifiers 17x, 17z and 17a, and the outputs thereof drive the servomotors 32x, 32z and 32a of the copying machine 3.
As a result, the tracer head 4 moves in the Z-axis direction so that the relative positional relationship with the model 6 is kept constant, and the table 31 to which the model 6 is fixed moves in the X-axis direction. The profiling is performed by rotating 34 in the A-axis direction.

Pulse coders 33x, 33z and 33a
Are pulse signals FPx, FPz and FPa each time the servomotors 32x, 32z and 32a rotate by a predetermined angle.
To occur. The current position registers 18x, 18z, and 18a in the digitizing control device 1 convert these pulse signals into reversible coefficients to obtain the current position data X of each axis.
A, Za and Aa are obtained and input to the processor 11.

The processor 11 takes in these position data at regular time intervals or when the amount of change in the position data exceeds a predetermined tolerance value and generates 4 NC data. This NC data is input to the paper tape reader / puncher 21 via the interface 19 to create an NC tape. Further, by directly connecting a numerically controlled machine tool (not shown) to the interface 19, it is possible to perform high-precision profile machining online.

FIG. 1 is a diagram for explaining the operation of the rotor profiling control system of this embodiment. Two limits LXN and LXP that are orthogonal to the X axis and a limit LZP that is orthogonal to the Z axis are virtually drawn on the model 6 that is cylindrical and has a thread groove formed on its side surface. Tracer head 4
First, the starting point Ps is approached, and when the stylus 5 contacts the thread groove, the tracing operation is started.

In the tracing operation, the model 6 is rotated in the A-axis direction and moved in the X-axis direction while the Z axis of the tracer head 4 is fixed. Tracer head 4 stylus 5
When reaches the limit LXN or LXP, the movement of the model 6 is temporarily stopped and the tracer head 4 is pick-fed by a predetermined amount in the Z-axis direction. In this case, the stylus 5 is pick-fed along the surface of the thread groove.
Therefore, the tracer head 4 also slightly moves in the X-axis direction.

Then, with the Z-axis of the tracer head 4 fixed at that position, the model 6 is rotated in the A-axis direction and moved in the X-axis direction in the opposite direction to perform a tracing operation. Thus, thereafter, the pick feed and the tracing operation are repeated, and when the stylus 5 of the tracer head 4 reaches the point Pe beyond the limit LZP, the entire cycle of the tracing operation is completed.

FIG. 3 is a flow chart showing the control procedure by the processor 11 for performing the above-mentioned rotary member tracing control system. [S1] Virtually draw the limits LXN, LXP and LZP. [S2] The tracer head 4 is approached toward the thread groove of the model 6. [S3] The stylus 5 of the tracer head 4 is the starting point Ps.
It is determined whether or not the approach has been completed and the approach is completed. If completed, the process proceeds to step S4, and if not completed, step S3 is repeated. [S4] The following operation is executed.

[S5] Tracer head 4 has limit LX
It is determined whether or not the position is N or LXP. If yes, the process proceeds to step S5, and if not, step S5.
repeat. [S6] The tracer head 4 is pick-fed by a predetermined amount in the Z-axis direction. [S7] Stylus 5 of tracer head 4 has limit L
It is determined whether or not the ZP position is reached, and if so, the entire cycle of the tracking operation is ended, and if not, step S
Return to 4.

As described above, in this embodiment, the limit LXN or LXP perpendicular to the X axis is virtually drawn, and the model 6
Since the model is rotated in the A-axis direction to perform the profiling operation, the data on the model surface can be collected completely. Therefore, more accurate profile control is possible.

In this embodiment, a cylindrical object is used as the model 6, but a conical object can be used instead. In this case, if the limit LZP perpendicular to the Z axis is drawn in parallel with the inclination of the model surface and the tracer head 4 is also moved in parallel with this limit LZP, it is possible to perform the same accurate control as described above. Become.

[0020]

As described above, according to the present invention, the tracer head holding a fixed distance from the rotation axis executes the tracing operation of the model surface while rotating the model, and the tracer head causes the first limit. Pick-feed motion between two second limits until
Since the inversion of the rotation direction of the model and the tracing operation are repeated, the data of the cylindrical or conical model surface such as a screw can be collected without exception. Therefore, more accurate profile control is possible.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an operation of a rotating body tracing control system.

FIG. 2 is a block diagram showing a configuration of a digitizing control device.

FIG. 3 is a flowchart showing a control procedure by a processor for carrying out a rotating body tracing control method.

[Explanation of symbols]

 1 Digitizing control device 2 Operation panel 3 Tracing machine 4 Tracer head 5 Stylus 6 model

Claims (2)

[Claims] 1. A rotating body follow-up control method that follows a model surface while rotating a model about a rotation axis, comprising: a first limit parallel to the rotation axis of the model; Two traced second limits are provided, and the tracer head held at a fixed distance from the rotation axis executes the tracing operation of the model surface while rotating the model, the tracer head When the second limit position is reached, the pick feed operation is performed, the rotation direction of the model is reversed and the tracing operation is continued, and the pick feed operation and the rotation direction of the model are continued until the first limit is reached. A rotating body follow-up control method characterized by repeating inversion and follow-up operations. 2. The tracing operation is performed while setting the first limit by inclining a predetermined angle with respect to the rotation axis of the model, and changing the distance from the rotation axis of the tracer head according to the inclination angle. The method according to claim 1, further comprising: