Boots – shoes – and leggings
Patent
1991-11-25
1994-05-03
Smith, Jerry
Boots, shoes, and leggings
318578, 364474370, G05B 1936
Patent
active
053093640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a trace control method for use when machining a metal mold or the like, and more specifically, to a trace control method by which some axes are controlled by an NC command.
2. Description of the Related Art
A control method is used for moving two axes by a numerical control (NC) command and controlling the remaining one axis to carry out a tracing. In this method, for example, the X- and Y-axes are controlled by an NC command and a Z-axis is controlled to carry out a tracing operation. More specifically, the X- and Y-axes are controlled by the NC command and the Z-axis is controlled by the following expression. of displacement of the X-, Y- and Z-axes, and .epsilon..sub.0 is a standard amount of displacement.
The above trace control method enables any point or path on an X-Y plane to be traced, and thus is very convenient for partially tracing a complex configuration or the like.
Nevertheless, the above method has a low accuracy and the tracing speed cannot be increased because the tracing is carried out for only one axis, and the indexing and distribution are not carried out for the three axes.
In particular, since the indexing and distribution are not carried out, when a tracer head traces an upward plane in the direction in which the tracer head is moving, the head tends to bite into the surface of the model. Conversely, when the tracer head traces a downward plane, the head tends to move away therefrom. As a result, a problem arises in that, when the tracer head is moved forward and then backward, a step is produced at the position at which the upward tracing movement is changed to a downward tracing movement.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a trace control method by which two axes are controlled by an NC command and three axes are controlled to carry out the tracing.
To attain the above object, according to the present invention, there is provided a trace control method for use when machining a workpiece by tracing a model with a tracer head, comprising the steps of controlling the speed and path of two axes by an NC command, controlling three axes, including these two axes, to carry out a tracing, and controlling the NC command speed to cause the NC command speed to coincide with the composite speed of the three axes controlled to carry out the tracing.
The path and speed of two axes (e.g., X- and Y-axes) are controlled by the NC command, and further, three axes are controlled to carry out the tracing, and the NC command speed is changed such that it coincides with the composite speed of the three axes controlled to carry out the tracing. The paths of the two axes are controlled by the NC command, and the speed thereof is a trace control speed, and thus the trace control method provides a movement equivalent to the movement provided when the three axes are controlled to carry out the tracing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a trace control apparatus embodying a trace control method according to the present invention; and
FIG. 2 is a block diagram explaining the calculation of a distributed speed .
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a trace control apparatus embodying a trace control method according to the present invention. NC commands 1 include a movement command for moving X- and Y-axes on an X-Y plane, and a feed speed command F. The movement command is pulse distributed by an interpolator 2a, based on a speed Fd from an override circuit 2b, which speed will be described below. The speed command F is supplied to the override circuit 2b.
Distributed pulses XP and YP are supplied to acceleration/deceleration circuits 3x and 3y, respectively, are accelerated or decelerated thereby, and then are supplied to adders 4x and 4y. The adders 4x and 4y subtract position feedbac
REFERENCES:
patent: 4703239 (1987-10-01), Yamazaki et al.
patent: 4803633 (1989-02-01), Kishi et al.
Aramaki Hitoshi
Okamoto Tetsuji
Fanuc Ltd.
Garland Steven R.
Smith Jerry
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