JPS6255706A - Method for correcting rectangularity of table positioning action - Google Patents

Abstract

PURPOSE:To always secure the correct arrival a target positioning point by correcting sequentially the error of rectangularity between a primary action shift in the direction of a reference axis and a secondary action shaft in the direction of an orthogonal axis over an entire working area in a positioning mode as a position displacement amount. CONSTITUTION:The position errors DELTAy and obtained DELTAx between a target intermediate point (b) and a specific shift point (a) in a positioning mode of a table 1 are registered previously to an NC device as parameters respectively. Then a correcting operation is repeated up to an optional target point. That is, a sequential error correcting means is used to shift manually a reference point (o), i.e., a shift start point toward an orthogonal axis B. Thus the table 1 is moved to the first specific shift point (a) from the point (o) and corrected at the first intermediate point (b). Then the table 1 is moved to the next specific shift point (c) from the intermediate point (b) and corrected at the next intermediate point (d). Hereafter the correction control is repeated in the same way and at the same time the table 1 is moved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a squareness correction method for table positioning operation in a table of a machine tool or the like whose positioning operation is controlled by a numerical control (hereinafter referred to as NO) device. It is related to.

[Conventional technology]

Generally, in this type of NG type machine tools.

As shown in Fig. 1, one main operating shaft 2 is arranged in the reference axis direction A, and the other sub-operating shaft is arranged in a direction B orthogonal to the reference axis direction A (hereinafter referred to as the orthogonal axis direction). 3 is connected to table l, and each of these axes 2 and 3 is connected to NC equipment M4.
Control based on programmed drive commands from
The drive devices 2a and 3a are operated to move the table 1 in a two-dimensional direction of a reference axis direction A and an orthogonal axis direction B, thereby performing positioning on the table 1 surface.

In such a conventional device, normally,
No particular squareness correction control is performed for the two-dimensional positioning of the table 1, and only table 1. In manufacturing the positioning operation mechanism, the alignment error with respect to the perpendicularity between the main operation shaft 2 and the sub-operation shaft 3 perpendicular to the main operation shaft 2, which constitute the positioning operation mechanism, is made as small as possible. The current situation is that a lot of effort is being expended.

[Problem that the invention seeks to solve]

However, in the conventional two-dimensional positioning operation on the table surface as described above, for example, as will be described later and as can be seen in FIG. B' is set, and if there is an error θ in the perpendicularity between the set reference axis direction A and the actual orthogonal axis direction, then by this angular error θ,
The positioning error Δy of the table accompanying the feeding operation on the axis direction B orthogonal to the ideal axis direction B' is the distance from the reference point 0! Δygtsinθ at point a, and this positioning error Δy is naturally equal to these angular errors θ
The larger the value, the larger the error is, and this error is accumulated corresponding to the distance The positioning error ΔX with respect to the above-mentioned feeding operation also has the problem that it becomes Δxm x (1-cogo) and cannot be ignored.

[Means for solving problems]

Therefore, it is an object of the present invention to correct the angular error between one main operating shaft arranged in the direction of the reference axis and the other sub-operating shaft arranged in the direction perpendicular to this reference axis. It is an object of the present invention to provide a squareness correction method for a table positioning operation in a working machine tool or the like, which allows the table to always reach two positioning target points correctly during the table positioning operation.

In order to achieve this object, the present invention uses the perpendicularity error value between the main operating axis in the reference axis direction and the auxiliary operating axis in the orthogonal axis direction as the positional displacement amount at the operation start reference point of the table during positioning operation. The correction is made nine times over the entire operating range from to the positioning target point.

[Created by,]

That is, in the case of the method of the present invention, the perpendicularity error value between the reference axis direction and the orthogonal axis direction is used as the positional displacement amount, and is sequentially corrected during the positioning operation. The table positioning operation can be controlled without accumulating positioning errors.

〔Example〕

Hereinafter, an embodiment of the squareness correction method for table positioning operation according to the present invention will be described in detail with reference to FIGS. 2 and 3.

FIGS. 2 and 3 are explanatory diagrams showing different embodiments of the method of this invention.

First, the method of the embodiment shown in FIG. 2 shows the relationship between the positioning operation and its correction when the table 1 is positioned by manually operating the main operation shaft 2 and the sub-operation shaft 3 after operation control by the NG device. It shows.

That is, in the method of the embodiment shown in FIG.

As in the conventional method, B' is the ideal axis direction that is correctly orthogonal to the reference axis direction set in advance, and
is the actual orthogonal axis direction, and θ is the angular error between these reference axis directions and the actual orthogonal axis directions.

In this way, if there is an angular error θ between the reference axis direction and the actual orthogonal axis direction, the sub-operating axis 3. In other words, by issuing a manual operation command to the actual orthogonal axis direction, the table l is moved from the reference point 0 position as the starting point to the distance! When the operation is performed to a specific moving point a, as described above, at the target intermediate point, ΔysxsinO, Δ! ! x(1
-cogo), and by continuing the operation, this error will gradually accumulate, and as a result, the table 1 will not be able to reach any target point.

Therefore, in the method of the embodiment shown in FIG.
nθ, Δ! With cod x (1-cosO) as a parameter,
If table l, which is registered in advance in the NG device and is located at one reference point 0 position, is moved to a specific moving point a at a distance x, the position error up to this point is corrected and the movement at this time is The point a is positioned at the target intermediate point, and thereafter, this correction operation is successively repeated up to an arbitrary target point.

That is, by having this sequential error correction means,
When a manual movement command is issued from the reference point 0 position as the movement start point to the orthogonal axis direction B side, as is clear from FIG. When point a is reached, correction control is performed to the first target intermediate point, and then from this first target intermediate point to the next specific moving point C.
Then, the correction control is performed to the next target intermediate point d, and by moving the table l while repeating this correction control one after another, the table l can be moved without accumulating the positioning error due to the squareness error θ. 1 and the maximum Δf
By controlling the operation of f-x sin θ and Δx-x (1-cos θ), it is possible to control the positioning accurately from the reference point 0 to an arbitrary target point.

Next, the method of the embodiment shown in FIG. 3 describes the positioning operation and its correction when positioning the table 1 by controlling the operation of the main operating axis 2 and the auxiliary operating axis 3 only by program commands from an NC device. It shows a relationship.

In this case, the date! ! When a positioning operation command of
θ, Δ! ! This results in a deviation by an error of z(1-cos θ).

Therefore, in the method of the embodiment shown in FIG. 3, the error correction vector ^ is combined with the program command vector to calculate the positioning vector B', and this vector B' is used as the positioning command to correct the squareness error θ. By eliminating the positional error due to this, it is possible to precisely control the positioning from the reference point 0 to any target point.

〔Effect of the invention〕

As described in detail above, the method of the present invention is to control the operation of the main operating axis in the 5 reference operating direction and the sub operating axis in the 0 operating direction orthogonal to this reference operating direction. In NC-type machine tools, etc., which position the table during positioning, the perpendicularity error in the orthogonal axis direction with respect to the reference operating direction is registered in advance as a parameter in the NC device, and the perpendicularity error is used during positioning. Since the correction control is performed without accumulating the accompanying positioning error, the positioning error caused by the squareness error can be eliminated.
It is possible to accurately position and control the table to any target point at any time.

[Brief explanation of drawings]

FIG. 1 is an explanatory plan view showing the arrangement of a main operating shaft and a sub-operating shaft for a general controlled table to be moved, and FIGS. 2 and 3 show a squareness correction method for table positioning operation according to the present invention. FIG. 7 is an explanatory diagram showing the relationship between positioning operation and correction according to different embodiments. 1...Table, 2...Main operating axis, 2a...
・Main operating shaft drive device, 3...Sub-operating shaft, 3a...
・・Drive device for sub-operating shaft, 4・・・・NC (numerical control)
Device. A: Reference axis direction, B': Ideal axis direction that is correctly orthogonal to the reference axis direction, B: Actual orthogonal axis direction. θ...Perpendicularity error between the reference axis direction and the actual orthogonal axis direction, a, c...Specific moving point, b, d...Target intermediate point, 0...As the movement start point The reference point of I...
・Distance from the reference point to the specific moving point and target intermediate point. ΔX: Positioning error with respect to feed operation on the reference axis direction, Δy: Positioning error with respect to feed operation on the orthogonal axis direction.

Claims (1)

[Claims] It has a main operating axis arranged in the standard operating direction and a sub-actuating axis arranged in the operating direction perpendicular to the reference operating direction, and by controlling the operation of both the main and sub-actuating axes, both operations can be performed. In the table of a machine tool, etc. that performs positioning operation in the direction, during positioning operation, the amount of positional displacement is
The error value for the perpendicularity between the main operating axis and the auxiliary operating axis is
A table characterized in that the operation can be controlled without accumulating positioning errors due to squareness errors by sequentially correcting the entire operation range from the table's operation start reference point to the positioning target point. Squareness correction method for positioning operation.