JPS63312042A - Tool interference preventing apparatus in numerically controlled automatic lathe - Google Patents

Abstract

PURPOSE:To improve safety by setting an interference region in which adjacent first and second tools cannot exist simultaneously and providing a stand-by position in which the second tool stands by when the first tool is present in the interference region. CONSTITUTION:When a blank is worked by the use of adjacent tools T1 and T2 which interfere with each other, the tool T1 is first selected to approach the approach position coordinate X10.0 for working. As soon as the tool T1 moves to the approach position X10.0, the tool T2 will move to the approach position. If this approach position X10.0 is in the interference region, the tool T2 cannot move to the approach position X10.0 due to a commanding code and will stand by in the stand-by position so that the tool T1 dues not interfere with the second tool T2. Thus, even if an operator carries out complicated programmings, no hazard such as tool breakage occurs to provide high safety.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a numerically controlled automatic lathe having a plurality of tool drive sources that can be arbitrarily and independently driven.

(2) Prior Art of the Invention A conventional numerically controlled automatic lathe that has a plurality of tool drive sources that can be arbitrarily and independently driven has a drive stroke setting means that can set the tool drive stroke for each tool drive source. However, the drive stroke can be regulated for each tool. By regulating the drive stroke for each tool using the setting means, it is possible to prevent simple programming errors such as when an operator programs a value outside the range of the drive stroke set value for each tool when creating a cutting program. can be prevented.

However, in conventional numerically controlled automatic lathes, although it is possible to regulate the drive stroke of each tool individually for each drive source, it is currently not possible to regulate the relative regulation of each tool of adjacent drive sources. Therefore, if an operator makes a complex programming error that includes multiple errors, such as changing the drive stroke of a tool and driving adjacent tools at the same time, there is no way to prevent this. There is a risk that the tools will collide with each other, that is, the tools will interfere with each other, resulting in damage to the tools.

(3) Purpose of the Invention The present invention was made in view of the above-mentioned drawbacks, and it prevents tool interference in a highly safe numerically controlled automatic lathe, without causing any risk of tool damage even if the operator makes a complicated programming error. The purpose is to provide equipment.

(4) Summary of the invention In order to prevent interference between a first tool and a second tool attached to mutually adjacent tool drive sources, the present invention sets an interference area in which these tools cannot exist at the same time, Furthermore, the above object is achieved by providing a standby position where the second tool waits when the first tool is in the interference area.

(5) Example of the Invention The present invention will now be described in detail based on an example. 1st
The figure is a configuration diagram showing the configuration of a tool interference prevention device in a numerically controlled automatic lathe of the present invention.

In national isolation, 1 is a central processing unit (hereinafter referred to as cp) that performs data calculations and controls each circuit via path line 2.
3 is tool 13 to tool 17 (T
This is a tool position register circuit for storing the current position coordinates of 1 and T5), and is connected to the pass line 2 and the discrimination circuit 6. An interference area setting circuit 4 is connected to the path line 2 and the discrimination circuit 6 for setting an interference area where a plurality of adjacent tools cannot exist because they interfere with each other if they move at the same time. Reference numeral 5 denotes a four constant circuit in which the tool is located in the interference area set by the interference area setting circuit 4, and is connected to the path line 2 and the discrimination circuit 6. 6 determines whether or not a tool exists within the interference area by comparing the data content of the interference area setting circuit 4 and the data content of the tool position register circuit 3;
This is a determination circuit for determining whether another tool interfering with the tool has moved to a standby position when a tool exists in the interference area, and includes a tool position register 3, an interference area setting circuit 4, and a standby position. It is connected to the setting circuit 5, the pass line 2 and the drive data memory circuit 7.

Reference numeral 7 designates a drive data memory circuit for temporarily storing drive data for driving a servo motor 10 that drives a tool based on the determination result determined by the determination circuit 6, and includes the determination circuit 6, the pass line 2, and the input/output circuit. It is also connected to circuit 8. Reference numeral 9 denotes a servo motor drive circuit that drives the servo motor 10 according to drive data stored in the drive data memory circuit 7, and is connected to the input/output circuit 8 and the servo motor IO that moves the tool. 11 is a processed data input device for inputting the data of the Canadian program created by the operator, and 12 is a display device (hereinafter referred to as CRT) for displaying the data of the Canadian program. It is connected to the output circuit 8.

FIG. 2 shows a coordinate diagram of tools in a numerically controlled automatic lathe, and 13 to 17 are drive sources for driving the tools, and the drive sources include tools T1, T2, T3, and T3, respectively.
T4 and T5 are installed.

All of these tools have origin <X100 in the coordinate diagram.
0), the origin and the center of the coordinate system (X'0.0)
It is possible to move arbitrarily on the straight line connecting the origin and the maximum value. Therefore, for example, if adjacent tools T1 and T2 simultaneously move toward the center (X 0°0), interference between these tools will occur.
In this embodiment, the tools shown on the ground surface 1 at T1 and T2 interfere with each other.

Table 1 Tools in the interference area Tools that interfere with tools in the interference area TI T2 T2 Tl or T3 T3 T2 or T4 T4 T3 or T5 T5 T4 In Table 1, the interference area is set by the interference area setting circuit 4 It is a coordinate area that is less than or equal to the value of the coordinate p (x). For example, if the coordinate of the current position of the tool T indicated by the tool position register circuit 3 is t (X), then t (X>≦P(
In the case of X), the tool T is in the interference area and t (X)>
In the case of P (X), it is outside the interference region. The interference area can be calculated as P(X) by considering the shape of the tool, etc.
It can be set arbitrarily within the range of <Origin (X100.O). If a tool exists within the interference area, even if another tool that causes interference with the tool moves toward the interference area, the tool cannot move into the interference area. Therefore, the tool cannot move into the interference area. needs to wait somewhere on the coordinates outside the interference area. The standby position Q (X) is determined by the standby position setting circuit 5 as P (X) <Q (X)≦
It can be set arbitrarily within the range of the origin (X10.O, O).

FIG. 3 is a flowchart when the tool is moved in the center (xOlo) direction in this embodiment. When a command to move the tool Tn (1≦n≦5=n is a natural number) is received during the national isolation, first, the tools Tn-1 and Tn+ adjacent to the tool To stored in the tool position register circuit 3 are moved.
1 coordinates t o−1 (X ) and tn+l (X )
A comparison is made with the maximum value coordinate 11P (X) of the interference region stored in the interference region setting circuit 4.

As a result of the comparison, if t n-1 (X) > P (X) or t n+1 (X) > P (X), the tool To
Move toward the center (X 0°0). On the other hand, t
n-1(X)≦P(X) or tn+1(X
)≦P(X), when the tool stored in the standby position setting circuit 5 is on standby, and when n+1 is 6, there is no judgment symbol. That is, when n=1, tn-1(X)≦p(x) is omitted, and when n=5, tn÷1(X)≦P(X) is omitted.

Next, the present invention will be explained using an example of a machine program created to move adjacent tools T1 and T2 at the same time. In this program, Goo is a positioning command code and a certain value from the current position. The tool moves at a fast retraction speed to a coordinate position that is far away. GOI is a linear interpolation command code, and the tool moves from the current position to a certain coordinate position at a speed specified by the speed command code F. For A2, specific conditions can be set by a numerical value added with a specific command code used together with the command code, but in this case, the tool T2 is moved in rapid traverse at GOOXIO1OZ35.0. Also, the standby position is Q(X)=X
40.0, and the standby position of the tool (hereinafter referred to as approach position) for starting machining of the material is assumed to be X10.0.

[Program example] (1) TI (2) GOOXIo, 0215.0 (3) GOIZ30. OFo, 02 (4), 001 X 10. OF0. 03.
A2 When a material is machined using adjacent tools T1 and T2 that interfere with each other according to the cutting program, the tool T1 is first selected in sequence (1), and the tool TI is selected in sequence (2). is the coordinate X10. 0 approached to O's approach position
Next, according to sequence (3), machining is performed using tool T1, and according to sequence (4), tool T1 is moved to approach position X10. At the same time as the tool T2 moves to the approach position X10. It is designed to move to O. Therefore, if the tools T1 and T2 move according to the cannibal program, these tools will interfere and be damaged.

However, in this case, the approach position X10.0 is within the interference area, so in sequence (4), the command code A2
The tool T2 cannot be moved to the approach position due to X40. Since the tool T1 is placed on standby at O, interference with the tool T1 can be prevented.

The present invention has been described above in detail based on one embodiment. However, the interfering tool may be kept in a standby position and the movement of the tool may be started after the interference condition is canceled. It is also possible to stop the movement of all the tools while waiting at the standby position.Furthermore, in this embodiment, the tools T1 to T5 are attached to five independent tool drive sources, and the adjacent tools Although the explanation has been given as an example of a case in which tools interfere with each other, the present invention is not limited to the tool drive source or the number of tools, but can include a plurality of tool drive sources that are adjacent to each other and can be driven independently. However, this applies to all cases where the tool drive source or the tools attached to the tool drive source interfere with each other.

(6) Effects of the Invention As detailed above, according to the present invention, by setting an interference area where tools attached to adjacent tool drive sources cannot exist at the same time, an operator can avoid making complicated programming errors. However, there is no risk of damage to the tool, and there are advantages in that it is possible to provide a highly stable tool interference prevention device for numerically controlled automatic lathes.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the tool interference device in the numerically controlled automatic lathe of the present invention, Fig. 2 is a coordinate diagram of the tool in the numerically controlled automatic lathe, and Fig. 3 is a diagram of the tool in the present embodiment when the tool is moved toward the center. It is a flowchart figure.

Claims (1)

[Claims] In a numerically controlled automatic lathe having a plurality of tool drive sources that can be arbitrarily and independently driven, a first tool attached to an adjacent first tool drive source that interferes with each other, and a second tool that are attached to adjacent first tool drive sources that interfere with each other. interference area setting means for setting an interference area in which a second tool attached to a tool drive source does not exist at the same time; 1. A tool interference prevention device for a numerically controlled automatic lathe, comprising a standby position setting means for setting a standby position for waiting.