JPS60110008A - Converter of copying motion into numerical information - Google Patents

Abstract

PURPOSE:To avoid an overhang or cut-in phenomenon for a converter which converts a copying action into the numerical information, by reducing the table traveling speed after deciding a deceleration area in a copying motion mode and putting the deceleration command information into the output position information. CONSTITUTION:A controller 17 drives motors MX-MZ so that a stylus 3 has a fixed level of contact pressure to the surface of a model 1. Then a table 7 is moved to make the stylus 3 copy after the surface of the model 1. A limit switch drive bar 32 turns on a limit switch 30 when it is detected while the table 7 is moving toward an axis (x) and then turns off the switch 30 when it is detected while the table 7 is moving in the opposite direction to the axis (x). While a limit switch bar 34 has an action reverse to the bar 32 and is therefore kept on while the switch 30 is set between both bars 32 and 34. A deceleration area deciding circuit delivers the deceleration command information when the switch 30 is turned on and then delivers the release information when the switch 30 is turned off. Thus, an overhang or cut-in phenomenon is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an apparatus for converting a copying motion into numerical information by constantly detecting the locus of the copying motion and processing the trajectory to convert the copying motion into numerical information.

Conventional technology In general, in order to perform a desired process on a workpiece material, a model of the desired shape is moved in advance using a stylus, the trajectory of the scanning motion is constantly detected, and this trajectory is processed to obtain numerical information. The obtained numerical information is stored in an external memory such as a paper tape or a fluorocarbon disk, and the workpiece material is processed using the stored numerical information. The tracing operation is controlled so that the contact pressure of the stylus against the model surface is always constant. The position of the stylus, which changes from time to time, is determined by checking the position of the housing that supports the stylus.

However, when tracing a place where the model surface changes suddenly, such as a part of a corner or corner 1, the housing that supports the stylus may shift from the position that the stylus traced, resulting in so-called sinking or overhang. . For this reason, the digitized information may include data that does not accurately reflect the model surface1. Even if the workpiece material is processed using this incorrect data, the desired processing may not be performed. be. The above-mentioned biting and o
In order to avoid hang-up, the tracing speed of the stylus can be slowed down, but if the tracing speed of the stylus is slowed overall, there is a problem that it takes too much time to convert into numerical information.

Purpose of the Invention In view of the problems in the prior art described above, the purpose of the present invention is based on the concept of inserting a deceleration command signal into the numerical information of copying gpJ+ production, and the purpose of the present invention is to maintain the accuracy of the workpiece material even when the model surface changes rapidly. The purpose is to provide a numerical information system that enables correct processing.

Structure of the Invention The gist of the present invention to achieve the above object is to provide a control device that drives and controls a stylus that scans the surface of a model and converts the tracing locus obtained by the scanning operation into numerical information, and a stylus. Equipped with a deceleration area determination means that determines the deceleration area on the model surface based on relative position information between the models, and reduces the relative speed between the stylus and the model while the stylus moves along the deceleration area. In addition, the numerical information system # is characterized in that deceleration command information is inserted into the numerical information of the copying motion.

Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram schematically showing a conventional state in which a stylus overhangs a model surface. As shown in the figure, when the stylus 3 traces the corner 2 of the model 1, the stylus 3
The stylus 3 overhangs at the corner 2 due to inertia.

FIG. 2 is a diagram schematically showing a conventional state in which a stylus housing is embedded into a model surface.

As shown in the figure, when the stylus 3 follows the corner portion 4 of the model 1, when the stylus 3 hits the wall of the model 1 in the direction of movement, the stylus 3 itself is stopped from moving in the direction of movement by the wall. However, due to the inertia of the stylus 3, the housing 5 supporting the υ stylus 3 tilts in the direction of travel.

Since the tracing trajectory by the stylus is obtained by recording all changes in the position of the housing 5, in the case of Figures 1 and 2 above, the obtained numerical information does not accurately reflect the surface of the model 1. become.

FIG. 3 is a block circuit diagram showing a numerical information converting device according to an embodiment of the present invention. In the figure, 1 is a model that is a type of the workpiece material, 3Fi is a stylus, 5 is a housing of the stylus, 7 is a table on which model 1 is placed, 9 is an arm that supports the housing 5 of the stylus 3, 11,
13. and 15 are the detector mounting bases for attaching the position detectors Px + Py p and P2f in the Y-axis, Y-axis, and two-axis directions, respectively; 17 is the II + control device; 19 and 21
1i respectively indicate external storage media for input and output.

According to an embodiment of the present invention, a limit switch 30 is provided at a predetermined position on the table 7, and limit switch drive pieces 32 and 34 are provided on the detector mount 11 to control on/off of the limit switch 30. . The area between the limit switch drive pieces 32 and 34 corresponds to an area where the table 7 should be decelerated. The output of the limit switch 3o is input to the deceleration region determination circuit 36. In the figure, the limit switch drive piece #' is shown to simplify the drawing.
Although limit switch drive pieces are provided only on the detector mount 11 in the ix-axis direction, in reality, limit switch drive pieces are also provided on the detector mounts 13 and 15 in the Y-axis and Z-axis directions.

The operation of the apparatus shown in FIG. 3 will now be described.

First, a well-known normal copying operation will be briefly explained.

The control device 17 controls the motor so that the contact pressure of the stylus 3 against the surface of the model 1 is always constant.

MY and M2 are driven to move the table 7 to IM+ and control the stylus 3 to follow the surface of the model 10.The position of the table 7 is determined by each position detector Px#Py rP
2. The detected position information X, Y is constantly detected by
, are input to the z/d control device 17. The control device 17 converts the position information into numerical information and stores it in the output external storage medium #21.

Next VCIv speed region determination operation will be explained.

The limit switch drive piece 32 turns on the limit switch 30' when detected while the table 7 is moving to the left in the X-axis direction, and turns on the limit switch 30' when the limit switch 30' is detected while the table 7 is moving in the opposite direction. It is configured to turn this off. Also, when the limit switch drive piece 34 detects the limit switch 30 while the table 7 is moving to the right in the X-axis direction, it turns on the limit switch 30, and turns on the limit switch 30 while the table 7 is moving in the opposite direction to the above direction. is configured to turn it off when it detects it. Therefore, the limit switch driving piece 32
and 34, the limit switch 3o is on. The speed region determination circuit 36 outputs deceleration command information when the output of the limit switch 30 is turned on, and outputs deceleration release information when the output of the limit switch 30 is turned off. Upon receiving the deceleration command signal, the control device 17 controls the motor Mx to 1. control to reduce the moving speed of the table 7 in the X-axis direction, include the deceleration command information in the position information output to the output external storage medium 21, and when a deceleration release signal is received, decelerate the motor and output it. Include the above deceleration release information in the position information. The deceleration region determination result by the tail movement piece of the limit switch (not shown) is similarly used to reduce the table movement speed in each axial direction, and is also used to include deceleration command information and deceleration release information in the output position information. In this way, the position information output in the conventional case where no deceleration area determination is performed is Xl + Y1 +
If t-1*X2p Y2 y Z2 v Xl * y31 z3 :
Then, it becomes as follows.

Xl + Yl + Zs: X2 r Y2 y Z2; MXx; (Deceleration command) Xl t Y3 r Z3 q X4 e Y4 #Z4; , zn; As explained above, since the deceleration area is determined during the copying operation and the table movement speed is reduced, the conventional phenomena of opening and digging are prevented, and incorrect data is not included in the output position information. Since deceleration command information and deceleration release information are often included in the position information used during machining, it is possible to accurately machining the workpiece material.
It is done easily.

In the above embodiment, the deceleration area is determined using the limit switch, the limit switch drive piece, and the deceleration area determination circuit, but the present invention is not limited to this. For example, the position information of the deceleration area is set in advance as reference position information in the control device 6, and the input position information is compared with the reference position information to generate a deceleration command signal and a deceleration release signal in the control device. You may also create it with .

Effects of the Invention As is clear from the above explanation, the present invention reduces the speed and also includes deceleration command information and deceleration release information in the output position information used during machining, so that in a numerical control device, The phenomenon of 1-bar hang or digging of the stylus during the copying operation is prevented, and the workpiece material can be processed accurately and without difficulty.

[Brief explanation of the drawing]

Figure 1 is a diagram schematically showing the conventional state in which the stylus overhangs the model surface, Figure 2 is a diagram schematically showing the conventional state in which the stylus housing sinks into the model surface, and Figure 3 is a diagram schematically showing the conventional state in which the stylus housing overhangs the model surface. 1 is a block circuit diagram showing a numerical information converting device # according to an embodiment of the invention; FIG. DESCRIPTION OF SYMBOLS 1...Model, 3...Stylus, 17...Control device, 36...Deceleration area determination circuit.

Claims (1)

[Claims] (2) A control device that drives and controls a stylus that moves over the entire surface of the model and converts the tracing locus obtained by the scanning operation into numerical information, based on the relative position information between the stylus and the model. and a deceleration area determining means for determining a deceleration area on the surface of the model, while the stylus is tracing the deceleration area, the relative velocity between the cough stylus and the model is reduced, and the tracing operation is A device for converting numerical information of a tracing operation, characterized in that deceleration command information is inserted into the numerical information of the following.