JPH1199443A - Turret turning control device on numerically controlled lathe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically avoid interference of tools with each other at the time of turning a turret on a turret turning control device on a numerically controlled lathe having structure where two tool rests having the turrets free to install a plural number of the tools are installed on the same saddle. SOLUTION: The device is furnished with position detection means 9, 10 to detect positions where turrets are divided, an interference judgement processing part 2 to judge whether interference with the other turret is caused or not at the time when one of the turrets is turned in accordance with a turret turning command to the one turret at dividing position of the two turrets detected by the position detection means at the time when the turret turning command is input and an interference avoidance judgement processing part 3 to judge whether interference can be avoided by revolving direction control of the one turret to which the turret revolving command is give in the case when it is judged to cause interference by the interference judgement processing part and to judge that avoidance preliminary motion is required when interference cannot be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control of a turret turning device on a tool post of a numerically controlled lathe, and more particularly, to a structure in which two tool posts having a turret to which a plurality of tools can be mounted are mounted on the same saddle. The present invention relates to a turret turning control device for a numerically controlled lathe having the following.

[0002]

2. Description of the Related Art Generally, a turret turning control in a numerically controlled lathe is controlled by short-distance control or by specifying a turning direction. ing. As one of the interference avoiding methods when the turret mounting tool interferes with the lathe main body or the workpiece during the turret turning, there is a method disclosed in Japanese Patent Publication No. 6-104291.

[0003] The method described in this publication is based on the premise that a turret number on which a tool causing interference when the turret turns is attached, and interference area data indicating the position of the interference object (the lathe main body or the work). Are set and stored, and a turning direction that does not cause interference is determined based on these setting data, and the turning control of the turret is performed based on the determination result. For example, in a numerically controlled lathe in which a turret on which a tool can be mounted on each side of a square turret head is placed on a saddle table, a special tool (a tool with a large overhang) that interferes with an interfering object is turret. Assuming that the interference object is attached to the portion of the turret number T1 and exists in the area between the turret numbers T2 and T3, the turret number T1 and the interference areas T2 to T
3 is set in advance and stored. When turning control is performed in response to the turret turning command, a direction that does not cause interference is determined based on the turret turning command, the current turret position, the turret number of the special tool, and the interfering object area data, and the turning control is performed in that direction. Is what you do.

This method of avoiding interference is a method for avoiding interference between a tool attached to a turret and a lathe body or a workpiece, and is a numerically controlled lathe having a structure in which one tool post is mounted on a saddle. Is effective in However, in the case of a numerically controlled lathe having a structure in which two turrets are mounted on the same saddle, when the tools interfere with each other when turning the turret due to the combination of the protrusion amounts of the tools mounted on the turrets of each turret Must specify the turret rotation direction in the program so that the program creator avoids interference.

[0005]

As described above, in a numerically controlled lathe having a structure in which two turrets each having a turret to which a plurality of tools can be mounted are mounted on the same saddle, the turret of each turret is used. Depending on the combination of the protrusion amounts of the tools mounted on the turret, interference between the tools may occur during turret turning. As one of the methods for avoiding interference when the turret mounting tool interferes with the lathe main body or the workpiece, there is a method disclosed in the above-mentioned Japanese Patent Publication No. 6-104291. In this method, interference between tools is avoided. Since the program creator must confirm the interference and indicate the turret rotation direction during the program, not only is it extremely difficult to create a program, but there is a there were.

Further, in the method disclosed in Japanese Patent Publication No. 6-104291, the machine operator must predict the interference situation in advance for the purpose of interference determination and set it using parameters and the like, and the machine operator can completely predict the interference. If not,
Even if the turret rotation control device has the interference avoidance capability, there may be cases where interference cannot be avoided.

The present invention has been made under the circumstances described above, and an object of the present invention is to use setting data (tool length correction value, etc.) necessary for machine operation and automatically determine the presence or absence of interference. An object of the present invention is to provide a turret turning control device in a numerically controlled lathe that can avoid interference between tools at the time of turning a turret without a program creator or a machine operator being particularly conscious by making a judgment and avoiding it.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a turret turning control device for a numerically controlled lathe having a structure in which two turrets each having a turret to which a plurality of tools can be mounted are mounted on the same saddle. The object of the present invention is to provide a device, comprising: a position detecting means for detecting a position where a turret is indexed; and a splitting means for two turrets detected by the position detecting means when a turret turning command is input. An interference determination processing unit that determines whether or not interference with the other turret occurs when the turret is rotated based on a turret rotation command for one of the turrets at the projecting position; and that the interference determination processing unit determines that interference occurs. In this case, it is determined whether or not the interference can be avoided by controlling the turning direction of one of the turrets for which the turret turning command has been issued. If unavoidable is achieved by providing the determined interference avoidance unit that avoids preliminary operation it is necessary, the.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. FIG. 3 is a schematic diagram (side view and plan view) showing the interference situation of the turret mounting tool, and FIG. 4 is a table showing the interference situation when each tool in FIG. 3 turns.

In FIG. 3B, on the saddle 20,
Two tool rests A and B each having square turrets 21a and 21b to which four tools can be mounted are arranged.
Each of the turrets 21a and 21b is turned in the direction of the arrow R and is driven in the Xa and Xb directions and the Z direction as shown in FIG. In a numerically controlled lathe having such a structure, one of the turrets 21a or 21a
When 1b is turned, interference between the tools occurs in a hatched portion in FIG. 3B depending on the combination of the protrusion amounts of the tools. In the mounting example of the tool shown in FIG. 4B, for example, the tool 22a mounted on the turret number T1 of the tool rest A
Are the tools 22f, 2 attached to T2, T4 of the tool rest B
Interferes with 2h.

In the present invention, in addition to the interference between the tool and the lathe body or the workpiece, such interference between the tools is avoided. For example, as shown in FIG.
For each turret number T1 to T4 attached to B,
It is determined whether or not there is interference between tools during turret turning based on the calculated value of the amount of protrusion of each mounted tool. The turning procedure in which the tools do not interfere with each other, such as turning the other turret and then turning the other turret as an operation, is determined based on the above-mentioned determination reference data such as the tool protrusion amount, and the respective turrets 21a and 21b are determined. The interference is avoided by controlling the turning direction.

Hereinafter, the configuration of the turret turning control device shown in FIG. 1 will be described with reference to a numerically controlled lathe having a structure as shown in FIG. 3 as an example. The machining program PR is analyzed by the program analysis unit 1, and a turret rotation command TC is transmitted to the interference determination processing unit 2 based on a turret rotation code described in the machining program PR.

The data storage unit 12 has a data setting unit 11
Various setting values SD necessary for machine operation input from an (operation panel or the like) are stored. The data calculation unit 13 uses the various setting values SD stored in the data storage unit 12 based on the various setting values SD.
An interference tool length is calculated for each of the turret numbers T1 to T4 of the tool rests A and B, and data representing the presence or absence of interference between the tools as shown in FIG. 4 is obtained as interference determination reference data JD. Here, the interference tool length TL is a correction amount of the cutting edge position of the tool accompanying the driving in the Xa, Xb and Z directions in FIG.
It is calculated by the following equation 1 using Dx and SDz. The above-described interference determination reference data JD is, for example,
It is created based on the judgment result of the judgment formula shown in. It should be noted that the case where the equation 2 is satisfied is “no interference (“ O ”in FIG. 4)”, and the case where the equation is not satisfied is “interference (“ x ”in FIG. 4)”.

[0014]

(Equation 1)

Da−Db ≧ Dc + Dd + De + Df Here, as shown in FIG. 3 (A), Da is the tool post A, B
Is the set value of the distance between the turret turning centers, Db is the interference margin dimension, and Dc and Dd are the set values of the distance from the turret turning center of each of the turrets A and B to the cutting edge position of the reference tool. De and Df are the interference tool lengths TL of the tools on the respective tool rests A and B calculated by the above equation (1).

Various setting values SD (the above-mentioned Da, Db, Dc,
Dd, SDx, SDz, etc.) are used only for avoiding interference by using data necessary for machine operation (tool length correction value, etc.) and machine-specific values (distance between tool post A and tool post B, etc.) It is possible to minimize the data setting that has been set as described above and to avoid complicated data setting and setting errors.

The interference determination processing unit 2 determines whether or not to execute the interference determination based on the interference determination execution or non-execution setting data MD which is set in advance by the data setting unit 11 and stored in the data storage unit 12. Turret indexing positions TPa and TPb obtained from the turret position detector 9 of the tool post A or the turret position detector 10 of the tool post B at the time when the turret rotation command TC is output from the section 1.
And turret indexing after the turret rotation instruction from the turret indexing position at the time when the turret rotation instruction TC is transmitted from the program analysis unit 1 based on the interference determination reference data JD calculated by the data calculation unit 13 The presence / absence of interference at the turret mounting tool interference position when the actuator is moved to the position is determined, and the determination result RD is sent to the interference avoidance determination processing unit 3.

If it is set in the setting data MD obtained from the data storage unit 12 that the execution of the interference determination is not to be performed, the turret rotation command TC sent from the program analysis unit 1 is transmitted to the tool post A as it is. To the turret turning command output unit 5 or the turret turning command output unit 6 of the tool post B. Setting data MD for determining whether or not to execute interference determination
When the interference determination processing unit 2 determines that there is no interference, the turret rotation command TC sent from the program analysis unit 1 is directly used as the turret rotation command output unit 5 of the tool post A or the tool. It is transmitted to the turret turning command output unit 6 of the table B.

An interference determination is performed based on the setting data MD for determining whether or not to execute the interference determination obtained from the data storage unit 12. If the interference determination processing unit 2 determines that there is interference, the interference avoidance determination processing unit 3 To determine whether or not to avoid interference and an interference avoidance method. If interference can be avoided by controlling the turning direction of the turret, a turret turning command TC ′ in a direction in which interference can be avoided is sent to the interference avoiding operation processing unit 4. If interference cannot be avoided only by controlling the turning direction of the turret, a preparatory avoidance operation (to avoid interference, turn the turret of the tool post opposite to the tool post for which turret turning was commanded to reduce the amount of protrusion The tool is indexed to the interference position, and the turret of the commanded turret can be rotated), and the turret rotation command TCP in the interference preliminary operation and the turret rotation command TC sent from the program analysis unit 1 are generated.
To the interference avoiding operation processing unit 4. If the avoidance preparatory action cannot be avoided even if it is generated, that is, if the avoidance preparatory action itself interferes, an alarm or the like is displayed.
Stop the program processing.

The interference avoiding operation processing section 4 sends a turret to the turret turning command output section 5 of the tool post A or the turret turning command output section 6 of the tool post B in accordance with the turret turning command TC 'sent from the interference avoiding determination processing section 3. Sends a turn command.
When the avoidance preparatory operation is generated in the interference avoidance determination processing unit 3, the turret rotation command TCa including the avoidance preparatory operation is performed.
And a command TCb for the turret turning timing of each tool post. Turret turning command output unit 5 of tool post A and tool post B
The turret turning command output unit 6 includes an interference avoiding operation processing unit 4
Alternatively, a turret turning command (TC, TC ′, TCa) and turning timing command (TCb) sent from the interference determination processing unit 2
, A command for driving the turret rotation motor 7 or the turret rotation motor 8 is output, and the turret rotation motor 7 or the turret rotation motor 8 is controlled.

FIG. 2 is a flowchart showing an example of a control operation procedure according to the present invention. When a turret rotation command is input from a program, it is determined whether or not to execute an interference check based on setting data of whether or not to execute interference determination (step S1). Determine the presence or absence of interference (step S
2). If interference is predicted, it is determined whether or not the automatic interference avoidance operation is valid (step S3). If it is, it is determined whether or not interference can be avoided by turning direction control (step S4). When interference avoidance cannot be achieved only by controlling the turning direction of the turret for which the swing command has been issued, it is determined whether or not the avoidance is possible by the avoidance preliminary operation (step S5). If interference can be avoided by generating the avoidance preliminary operation, the other turret is turned by the avoidance preliminary operation,
After locating a tool that does not cause interference due to the turning of the turret for which the turning command has been issued among the tools attached to the turret (step S6), the turning direction is controlled (step S7), and the operation is terminated. When it is determined in step S4 that the interference can be avoided by the turning direction control, the turning direction control is performed in the determined turning direction (step S7), and the operation ends. On the other hand, step S1
If it is determined not to perform interference check in
Alternatively, when it is determined in step S2 that there is no interference, the turret is rotated by the conventional control (step S8), and the operation ends. When it is determined in step S2 that there is interference and in step S3 it is determined that the automatic interference avoidance operation is not possible, or when it is determined in step S5 that avoidance by the avoidance preliminary operation is impossible. Outputs an interference warning alarm display (step S
9) After stopping the execution of the machining program (step S
10), end the operation.

[0021]

As described above, according to the present invention, when the turret is turned, the amount of protrusion of each tool is checked, and the turning direction and the interference avoiding operation are automatically determined so that interference between the tools does not occur. Since the turning of the turret is controlled, not only the burden on the program creator and the machine operator can be reduced, but also accidents such as machine breakage can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention.

FIG. 2 is a flowchart showing an example of a control operation procedure according to the present invention.

FIG. 3 is a schematic diagram illustrating an interference situation of a turret mounting tool.

FIG. 4 is a table showing the interference situation when each tool in FIG. 3 is turned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Program analysis part 2 Interference determination processing part 3 Interference avoidance determination processing part 4 Interference avoidance operation processing part 5 Turret rotation command output part of turret A 6 Turret rotation command output part of turret B 7 Turret rotation motor of turret A 8 Turret turning motor of turret B 9 Turret turning position detector of turret A 10 Turret turning position detector of turret B 11 Data setting unit 12 Data storage unit 13 Data calculation unit

Claims (2)

[Claims] 1. A turret rotation control device for a numerically controlled lathe having a structure in which two turrets each having a turret to which a plurality of tools can be mounted is mounted on the same saddle, detects a position where a turret is indexed. Position detecting means, and at the index position of the two turrets detected by the position detecting means when a turret turning command is input, when the turret is turned based on the turret turning command for one turret, the other turret The interference determination processing unit that determines whether or not interference occurs, and when the interference determination processing unit determines that interference occurs, the interference can be avoided by controlling the turning direction of one of the turrets to which the turret rotation command has been issued. Interference avoidance determination processing for determining whether or not the interference cannot be avoided, and for determining that the avoidance preliminary operation is necessary. A turret turning control device for a numerically controlled lathe, comprising: 2. The avoidance preparatory operation includes rotating the other turret, for which the turret rotation command has not been issued, so that, of the tools attached to the turret, a tool that does not cause interference due to the rotation of the one turret. 2. The turret turning control device for a numerically controlled lathe according to claim 1, wherein the turret turning control is performed.