JPH0366548A - Software table limit device for nc machine tool - Google Patents

Abstract

PURPOSE:To eliminate stopping on the way of positioning when a working table reaches the present point of intersection in a limit range by judging whether to be stopped or continued through a limit signal judging means, based on the input signal of a limit signal input means. CONSTITUTION:The computed result by a computing means 26 for a point of intersection in which a straight line locus between a start point ST and an end point ED to position a table intersects a limit range (oblique line part) at a present point of intersection SP and a remaining point of intersection Stheta, is compared with the position 25 of the working table by a comparison means 22. It is judged whether the point 25 is inside or outside the limit range. At outside the range, usual movement is performed by an outside limit movement control means 23. At inside the range, movement from the present point of intersection SP to the remaining point of intersection Stheta is made by an inside limit movement control means 32. Consequently, positioning is not stopped on the way and the point 25 is automatically moved to the end point ED. Further, stop or continuance of movement in the limit range is judged by a judging means 28 based on a limit signal input means 27 and it can be stopped even in the range.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a software table limit device for an NC machine tool that uses software to control the positioning of the linear trajectory of a machining tool and jig within the limit range of a machining table. It is something.

[Prior Art] Fig. 4 shows a software table limit device of a conventional NC machine tool, that is, an NC electric discharge machine, as shown in, for example, Japanese Patent Application Laid-open No. 81-260930 or Japanese Patent Application Laid-open No. 62-138249. FIG. 2 is a block diagram showing the main parts of. In the figure, (1) is a control device that includes a data input section (2), a central processing unit (3), and an interface (
4), a table driving amplifier (5>). (6> is a drive device, which drives a processing table (7>),
A motor (8) that drives a processing table (7), a workpiece (9), a processing tool 00〉, and a processing tool (10)
It consists of a jig (11) for holding the.

The central processing unit (3) includes a limit range determining means (21) that determines the limit range of the processing table (7) based on the data transferred from the data input unit (2);
a position detection means (25) for detecting the current position of the processing table (7); and a comparison means (22) for determining whether the processing tool (10) and jig (11) are within or outside the limit range. , out-of-limit movement control means (23) for controlling the movement of the machining table (7) when the comparison means (22> determines that it is outside the limit range); (7) It has a function as a movement stop control means (24) for stopping movement.

FIG. 5 is a diagram showing the principle of the conventional software table limit, in which (ST) is the positioning start point, (E
D) is the positioning end point, (SP) is the positioning stop point, (
xl> is the limited range of movement in the negative direction of the X-axis, (x2) is the limited range of movement in the positive direction of the X-axis, (Yl> is the limited range of movement in the negative direction of Ytib, and (Y2) is the limited range of movement in the positive direction of the Y-axis. be.

Next, we will discuss the operation of the conventional device having the above-mentioned configuration in the fourth section.
This will be explained based on FIG. First, limit range determining means (2
1) is a limit range (Xi - X2) based on the data transferred from the data input section (2).

(Yl-Y2) is calculated. Next, comparison means (22)
determines whether the machining tool (10) and jig (11) are within or outside the limit range based on the current position of the machining table (7) detected by the position detection means (25), and When it is determined that (ST-3P),
The out-of-limit movement control means (23) performs normal positioning, and when it is determined that it is within the limit range, that is, at the point (SP), the movement stop control means (24) controls the interface (4) and the table drive amplifier. (5)
to stop the movement of the processing table (7).

[Problems to be Solved by the Invention] Since the conventional software table limit device of the NC machine tool is configured as described above, in FIG.
If the purpose is to finally position to the positioning end point (ED), rather than having a meaning, the path to the positioning stop point (sp) may be reached midway despite automatic positioning. There was a problem that positioning stopped.

The present invention has been made to solve the above-mentioned problems, and if the operator determines that there is no need to stop positioning even when the processing table is within the limit range, positioning can be stopped midway. An object of the present invention is to obtain a software table limit device for an NC machine tool that can automatically position up to a positioning end point (ED) without stopping positioning at a point (sp).

[Means for Solving Problem 11] The software table limit device for an NC machine tool according to the present invention includes an intersection point calculation means for calculating a current intersection point and a remaining intersection point, which are two intersection points between a limit range and a linear trajectory to be positioned. and a position detecting means for detecting the moving position of the processing table, and determining whether the processing tool and jig exist within or outside the limit range from the calculated current intersection point and remaining intersection point and the position of the processing table. out-of-limit movement control means that performs normal movement when the comparison means determines that it is outside the limit range; A limit movement amount calculation means that calculates the amount of movement along the limit range up to the intersection in clockwise and counterclockwise directions, and a limit direction determination means that compares the calculated movement amounts and determines the direction that provides the shortest amount of movement. Then, the within-limit movement control means that continues to move in the determined direction along the contour shape of the limit range compares the position during the within-limit movement from the position detection means with the residual intersection point, and if they match, the above-mentioned and remaining intersection point comparison means for stopping the within-limit movement control means and driving the outside-of-limit movement control means.

Further, a limit signal inputting a signal for determining whether to stop the movement of the processing table or to continue moving along the contour shape of the limit range when the comparison means determines that the processing table is within the limit range. an input means; a limit signal determining means for determining whether to stop or continue based on the input signal of the limit signal input means when the current intersection is reached; and a limit signal determining means for determining whether to stop or continue based on the input signal of the limit signal input means; A movement stop control means for stopping the movement is provided, and the limit movement amount calculation means is configured to operate when the limit signal determination means determines to continue.

[Function] In the present invention, the comparison means compares the calculation result of the current intersection point and the remaining intersection point between the linear locus to be positioned and the limit range by the intersection calculation means with the position of the processing table, and adjusts the processing tools and jigs. The outside-of-limit movement control means performs normal movement when it is outside the limit range, and the inside-limit movement control means moves from the current intersection point to the remaining intersection point when it is within the limit range. Since the movement is performed along the limit range, even when the linear trajectory to be positioned is within the limit range, the positioning can be automatically moved to the positioning end point without stopping midway.

Furthermore, in the present invention, the limit signal input means can instruct the stop or continuation of movement within the limit range, so when it is necessary to stop the movement within the limit range, the limit signal input means If an instruction is given to stop the movement within the limit range from , the movement stop control means stops the movement of the processing table when the current intersection point is reached.

[Example] The present invention will be explained below based on illustrated embodiments.

FIG. 1 is a block diagram showing the main parts of a software table limit device for an NC machine tool according to an embodiment of the present invention;
FIG. 2 is a flowchart showing the flow of the process, and FIG. 3 is a diagram showing the principle of the software table limit. Parts corresponding to the conventional ones are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, (2B) is an intersection calculation means for calculating the intersection of the linear trajectory to be positioned and the limit range calculated by the limit range determination means (21), and (27) is the comparison means (22) that is the limit range. Limit signal input means (28> is a limit signal input means (28) for inputting a signal for determining whether to stop the movement of the processing table (7) or continue based on the limit range when it is determined that the movement is within the limit range; (27) is a limit signal determining means for determining whether to stop or continue; (29) is a limit signal determining means (29)
8) A limit movement amount calculation means that calculates the movement amount along the limit range from the current intersection point to the remaining intersection point in clockwise and counterclockwise directions when continuation is detected, and (30> compares these calculated movement amounts. (31) is the processing table (7) detected by the position detection means (25>).
residual intersection point comparison means for comparing the current position of and the residual intersection point, (3
2) is when the residual intersection comparison means (31) determines that the current position and the residual intersection do not match, the limit direction determination means <30>
This is a within-limit movement control means that continues movement along the limit range in the direction of the shortest movement amount determined in .

Further, in FIG. 3, (SP) is the first intersection (current intersection) between the linear trajectory to be positioned and the limit range, and (Sθ) is the second intersection (remaining intersection).

Next, the operation of the apparatus of this embodiment having the above-described configuration will be explained based on FIGS. 1 to 3. First, from the positioning start point (ST) to the positioning end point (ED) as shown in Figure 3.
When performing linear positioning, the operator sets data in advance using the limit signal input means (27), which means whether to stop or continue positioning when the position falls within the limit range during positioning. ). Next, the linear trajectory to be positioned and the limit range determining means (2
1) Intersection point (SP) with the limit range calculated by
(Sθ) is calculated by the intersection point calculation means (26) using a well-known intersection point calculation method (5 step 2). Here, the coordinates of both the intersection points (SP) and (Sθ> are calculated as sP<xp, Y
, ), 8B(X,,Y,).

Then, use the comparison means (22) to determine whether or not the calculated intersection point matches the current position. 5top 3)
While they do not match, that is, between (ST) and (SP), normal positioning is performed by the out-of-limit movement control means (23>) (5 tep 4). If the calculated intersection point (sp) and the current position match, 5 tep The limit signal determining means (28) determines whether the input data means stop or continuation (5step 5), and if it means stop, the movement is stopped by the movement stop control means (24) 5step 8 ), if it means to continue, the limit movement calculation means (29) calculates the movement mL1 . Calculate L2 (5step7).

Clockwise Ll-(X, -Xi) + (Y2-Yl) +(X
, -Xi) Counterclockwise L2-(X2-X, ) +(Y2-Yl) +(
X2-Xo)Ll>L2 Next, the movement ff1L1. L2 is compared by the limit direction determining means (3o) and Ll >L
2) Determine the counterclockwise direction that will result in the shortest amount of movement (
5 step 8).

After that, the remaining intersection point comparing means (31) judges whether the current position matches the remaining intersection point, that is, the second intersection point (Sθ) 5tep9), and while it does not match, the within-limit movement control means (32) at 5tep8) Along the limit range to the determined excellent poem, (SP) → (X2.Yl) → (X2
．． Y2) - 5 steps to move to (X, , Y, )
lO), and when it coincides with the second intersection (Sθ), the out-of-limit movement control means (23) resumes normal positioning. Then, it is determined whether the current position matches the positioning end point (ED) or not.
HD), return to 5 step 3, positioning end point (
ED), positioning ends.

In addition, in the above-mentioned embodiment, the case where there is an intersection between the linear locus for positioning and the limit range is shown.
It goes without saying that the apparatus of the present invention can control normal positioning even when there is no intersection.

Further, in the above-described embodiment, the limit signal input means (27
) etc., but if it is not necessary to always stop positioning even when the processing table is within the limit range, the broken lines in Figures 1 and 2 may be used. The part enclosed by , that is, the limit signal input means (27
>, limit signal judgment means (28>), limit movement amount calculation means (29), movement stop control means (24), and 5t
epl, 5tep5.5tep8 can be made unnecessary.

Furthermore, in the above-mentioned embodiments, an NC electric discharge machine was used as an example of the NC machine tool, but the present invention is not limited to this, and the present invention can also be applied to other NC machine tools, such as milling machines. Even in such a case, the same effects as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, the comparison means compares the calculation results of the current intersection point and the remaining intersection point between the linear locus to be positioned and the limit range by the intersection calculation means with the position of the processing table. The processing tool and jig are compared to determine whether they are inside or outside the limit range, and when they are outside the limit range, the outside-of-limit movement control means performs normal movement, and when they are within the limit range, the inside-limit movement control is performed. Since the means is configured to move along the limit range from the current intersection point to the remaining intersection points, even if the straight line locus to be positioned is within the limit range, positioning can be automatically completed without stopping halfway. It has the effect of being able to move to a point.

Furthermore, in the present invention, it is possible to instruct the stop or continuation of movement within the limit range using the limit signal input means, so when it is necessary to stop the movement within the limit range, the limit signal input means can be used to stop or continue the movement within the limit range. Instructing to stop the movement within the limit range has the effect that the movement stop control means stops the movement of the processing table when the current intersection point is reached.

There is an effect.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a control device of a software table limit device for an NC machine tool according to an embodiment of the present invention, Fig. 2 is a flowchart showing the flow of its processing, and Fig. 3 is the principle of the software table limit device. 4 is a block diagram showing a software table limit device of a conventional NC machine tool, and 5 is an explanatory diagram for explaining the
The figure is an explanatory diagram for explaining the principle of the software table limit. In the figure, (7) is a processing table, (9) is a workpiece, (10) is a processing tool, (11) is a jig, (21) is a limit range determining means, (22) is a comparison means, ( 23)
(24) is a movement stop control means, (25) is a position detection means, (26) is an intersection calculation means, (27> is a limit signal input means, (28) is a limit signal judgment means, (29) is limit movement amount calculation means;
(30) is limit direction determining means, (32) is within-limit movement control means, (31) is residual intersection point comparison means, (sp)
is the first intersection (current intersection), (Sθ) is the second intersection (residual intersection)
It is. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) Move the processing table to move the workpiece fixed to the processing table, the processing tool, and the jig that holds the processing tool relative to each other, and move the processing tool and jig to the workpiece. When automatically linearly positioning to the specified position,
In a software table limit device for an NC machine tool, which is equipped with means for determining a limit range of a machining table for the machining tool and jig, the current intersection point and the remaining intersection point of the limit range and a linear trajectory to be positioned are an intersection point calculation means for calculating an intersection point; a position detection means for detecting a moving position of the processing table; and a position detection means for detecting a moving position of the processing table; a comparison means for determining whether the object exists inside or outside; an outside-of-limit movement control means for causing normal movement when the comparison means determines that the object is outside the limit range; A limit movement amount calculation means that calculates the movement amount along the limit range from the current intersection point to the remaining intersection point in clockwise and counterclockwise directions, and a limit movement amount calculation means that compares the calculated movement amount and determines the shortest movement amount. a limit direction determining means for determining the direction in which the limit is moving; a within-limit movement control means for continuing the movement in the determined direction along the contour shape of the limit range; a software table limit device for an NC machine tool. (2) Limit signal input for inputting a signal that determines whether to stop the movement of the processing table or to continue moving along the limit range when the comparison means determines that it is within the limit range. means, limit signal determining means for determining whether to stop or continue based on the input signal of the limit signal input means when the current intersection point is reached, and movement of the processing table when the limit signal determining means determines to stop. The NC machine tool according to claim 1, further comprising a movement stop control means for stopping the movement, and the limit movement amount calculation means is configured to operate when the limit signal determination means determines to continue. Software table limit device.