JPH05250026A - Numerical controller with interference preventing barrier - Google Patents

Abstract

PURPOSE:To utilize the working region of two control axes effectively by defining necessary part only as interference preventing barrier. CONSTITUTION:On the plane composed of two control axes, a boundary line calculation part 6 is provided to calculate a straight line crossing two arbitrary points as the boundary line of the interference preventing barrier and an interference check part 3 is provided to control the movable region of the two control axes in accordance with the target value which is read into by a command value reading part 1 and the boundary line which the boundary line calculation part 6 calculates. The interference check part 3 reads the command value of axes A and B into variable ACOM and a BCOM from the command value reading part 1, and the boundary line calculation part 6 reads barrier data into variable AH, AG, BH and BG respectively from a barrier data memory 2, and calculates data B for interference check using the data read into and a first formula. The data B and the command value BCOM of B axis are compared, and axis moving command is instructed in the case of B>BCOM and alarm generation is instructed in the case of B<BCOM.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control apparatus having an interference prevention barrier for restricting a control axis movable area in a machine tool which obtains a two-dimensional processing area by combining two control axes.

[0002]

2. Description of the Related Art Conventionally, two control axes are combined into two
There is a machine tool that obtains a dimensional machining area, and a numerical control device having an interference prevention barrier is known to regulate the control axis movable area of the machine tool. This numerical controller is shown in FIG.
As shown in (1), it has a command value reading unit 1 that reads the command values of the A axis and the B axis, and also has a barrier data memory 2 that stores preset barrier data. The command value reading unit 1 and the barrier data memory 2 determine whether or not the target value read by the command value reading unit 1 is within the interference area defined by the barrier data preset in the barrier data memory 2. The interference check unit 3 is connected, and the command value reading unit 1 and the interference check unit 3 perform axis movement according to the command value read by the command value reading unit 1 upon receiving the axis movement command from the interference check unit 3. The axis moving unit 5 is connected. Further, the interference check unit 3 displays an alarm when the target value read by the command value reading unit 1 is in the interference region defined by the barrier data preset in the barrier data memory 2. The alarm generator 4 is connected.

FIG. 5 is a diagram showing an interference prevention barrier.
A-axis and B-axis positive stroke limit (+ LMT),
The movable range abcd is defined by the minus stroke limit (-LMT). When there is an interfering object 10 indicated by a broken line with respect to the movable range abcd, a quadrangle degf having diagonal points e and f as an interference barrier is used as an entry prohibition region (interference prevention barrier).

Next, the operation will be described with reference to the flowchart of FIG. The interference check unit 3 reads A from the command value reading unit 1.
Axis and B axis command values are read into variables ACOM and BCOM (step 1), and barrier data Af and Be are read into variables AF and BE from the barrier data memory 2 (step 2). Furthermore, based on the read data,
It is judged whether or not the command value ACOM of the A axis is larger than the variable AF (step 3), and the command value ACOM of the A axis is set to the variable A.
When it is determined that the value is larger than F, it is compared and judged whether the command value BCOM of the B axis is larger than the variable BE (step 4). When it is determined that the B-axis command value BCOM is larger than the variable BE, the alarm generation unit 4 is instructed to generate an alarm (step 5). In step 3 above, A
When it is determined that the command value ACOM of the axis is smaller than the variable AF, and in the step 4 described above, the command value BC of the B axis is
When it is determined that OM is smaller than the variable BE, the axis moving unit 5
To the axis movement command (step 6), and the axis movement unit 5
Upon receiving the axis movement command from the interference check section 3, the axis movement is performed according to the command value read by the command value reading section 1.

Further, Japanese Patent Laid-Open No. 63-118808 proposes a numerical control device which prohibits operation in a three-dimensional interference region. In this device, the three-dimensional interference area is set and stored in an arbitrary shape by turning on / off each bit of the storage means, and this bit is turned on / off during processing.
Depending on the off state, the tool is moved so as not to enter the interference area.

[0006]

Since the conventional numerical control apparatus having the interference prevention barrier is configured as described above, when the barrier check is performed, regardless of the shape of the interfering object 10, the entry prohibiting area (interference is prevented). Since the operation in the prevention barrier is prohibited, the barrier is applied to a region where interference does not actually occur depending on the shape of the interferer (for example, an interferer that obliquely intersects the movable range). There is a problem that the machining area of the control axis becomes narrow.

The present invention has been made in order to solve the above problems, and a numerical controller capable of effectively utilizing the machining areas of two control axes by making only a necessary portion an interference prevention barrier. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a numerical controller having an interference prevention barrier according to the present invention has an arbitrary two positions on a plane formed by two control axes. A setting storage unit that sets and stores the coordinates of points, a boundary line calculation unit that calculates a straight line that passes through the arbitrary two points as a boundary line of the interference prevention barrier, and a movable area of two control axes is regulated according to this boundary line. It is characterized by comprising:

[0009]

The numerical controller according to the present invention sets the coordinates of any two points on the plane formed by two control axes and stores them in the setting storage unit, and a straight line passing through any two points is used as an interference prevention barrier. The boundary line is calculated by the boundary line calculation unit.
Further, according to the boundary line calculated by the boundary line calculation unit, 2
The movable regions of the two control shafts are regulated by the regulation means, and only the necessary portions serve as the interference prevention barrier, so that the machining regions of the two control shafts can be effectively used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a numerical controller according to an embodiment of the present invention. This numerical control device
It has a command value reading unit 1 for reading command values of the axes and the B-axis, and a barrier data memory 2 for setting and storing coordinates of arbitrary two points on a plane formed by two control axes. is doing. The barrier data memory 2 has an arbitrary 2
A boundary line calculation unit 6 that calculates a straight line passing through the points as a boundary line of the interference prevention barrier is connected, and the command value reading unit 1 and the boundary line calculation unit 6 include the target value read by the command value reading unit 1 and the target value. The interference check unit 3 that restricts the movable regions of the two control axes according to the boundary line calculated by the boundary line calculation unit 6 is connected. Command value reading unit 1 and interference check unit 3
An axis moving unit 5 that receives an axis moving command from the interference checking unit 3 and moves the axis according to the command value read by the command value reading unit 1 is connected to the. Further, the interference check unit 3 displays an alarm when the target value read by the command value reading unit 1 is in the interference area defined by the barrier data preset in the barrier data memory 2. The alarm generator 4 is connected.

FIG. 2 is a diagram showing an interference prevention barrier.
In this figure, the plus stroke limit (+ LMT) and minus stroke limit (-LM) of the A and B axes are shown.
The movable range abcd is defined by T). When interference occurs in the movable range abcd in the triangle def, the movable range abcd is determined by the stroke limits of the A axis and the B axis. Ah indicates the A-axis coordinates of the intersection of the A-axis and a straight line passing through the h-point and parallel to the B-axis, and Ag is g
A-axis coordinates of an intersection of a straight line passing through a point and parallel to the B-axis and the A-axis are shown. Bh indicates the B-axis coordinates of the intersection of the straight line passing through the h point and parallel to the A axis and the B axis, and Bg indicates the B axis coordinates of the intersection of the straight line passing through the g point and parallel to the A axis and the B axis. It should be noted that 10 indicates an interfering substance.

When an axis movement command is given and a line passing through points g and h is used as a boundary line for the interference barrier check and the command point exceeds the boundary line and enters the interference area, an alarm command is issued and the command point is changed. If it is in the non-interference area without crossing the boundary line, an axis movement command is issued. It should be noted that whether or not the boundary line is in the interference region is determined by the boundary line formula (next formula) B = (Bg−Bh) / (Ag−Ah) · (A−Ag) ) + Bg ... Substituting the A-axis position of the command point for (1), if the calculated B-axis position is smaller than the B-axis coordinate of the command point, it is considered that the command is in the interference area, and the B of the command point is If it is larger than the axis coordinate, it is regarded as being commanded in the non-interference area.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. The interference check unit 3 outputs the command values of the A axis and the B axis from the command value reading unit 1 to the variables ACOM and B.
Read into COM (step 11). In addition, the boundary line calculation unit 6 uses the barrier data memory 2 to store the barrier data Ah,
Ag, Bh, and Bg are variables AH, AG, BH, and B, respectively.
Data is read into G (step 12), and the data B for interference check comparison is calculated using the read data and the first equation (step 13). The interference check unit 3 compares the interference check comparison data B calculated by the boundary line calculation unit 6 with the B-axis command value BCOM (step 14), and B> BCO
In the case of M, the axis movement command is given to the axis movement unit 5, and the axis movement unit 5 receives the axis movement command from the interference check unit 3 and moves the axis according to the command value read by the command value reading unit 1 ( Step 15). When B <BCOM, the alarm generation unit 4 is instructed to generate an alarm (step 1
6).

[0014]

As described above, according to the present invention,
The coordinates of any two points on the plane formed by the two control axes are set, a straight line passing through the two arbitrary points is calculated as the boundary line of the interference prevention barrier, and the two control axes of the two control axes are calculated according to the calculated boundary line. Since the movable area is regulated, only the necessary portion can be used as the interference prevention barrier, and the processing areas of the two control axes can be effectively used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a numerical control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an interference prevention barrier according to the present embodiment.

FIG. 3 is a flowchart showing the operation of this embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional numerical control device.

FIG. 5 is a diagram showing a conventional interference prevention barrier.

FIG. 6 is a flowchart showing an operation of a conventional example.

[Explanation of symbols]

 1 Command value reading unit 2 Barrier data memory 3 Interference check unit 4 Alarm generation unit 5 Axis movement unit 6 Boundary line calculation unit 10 Interfering objects

Claims (1)

[Claims] 1. A numerical controller for controlling a movable range of a control axis of a machine tool, which obtains a two-dimensional machining area by a synthetic operation of two control axes, by an interference prevention barrier, on a plane formed by the two control axes. Any 2
A setting storage unit that sets and stores the coordinates of points, a boundary line calculation unit that calculates a straight line that passes through the arbitrary two points as a boundary line of the interference prevention barrier, and a movable area of two control axes is regulated according to this boundary line. A numerical control device comprising: