JP2716304B2 - NC device tool connection abnormality processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a tool joint abnormality in an NC device.
When an abnormality is detected in the state of gripping (joining) of the tool to the drive shaft, a tool joining abnormality process of the NC device that repeatedly changes joining conditions and joining operations under the changed joining conditions until the abnormal state is released. About the method.

[0002]

2. Description of the Related Art Conventionally, an NC device such as a numerically controlled machine tool used for machine work is provided with an automatic tool changer, and works a workpiece while appropriately changing tools based on a machining program.

In the NC apparatus, the quality of a tool (blade) before and after machining is checked, and a tool abnormal condition such as wear or breakage of a tool such as a drill is detected during machining. In the case, for example,
As described in Japanese Patent Publication No. 483, an ATC (Automatic Tool Changer) automatically performs a tool change and performs a process at the time of a tool joining abnormality such that a machining operation is continued.

[0004] The tool change is performed, for example, in Japanese Utility Model Publication No. 61-353.
No. 92, which is performed in a configuration, when the tool is replaced, cutting chips adhere to the tool joint,
In order to prevent the tool from being incompletely joined to the drive shaft, the tool is changed after jetting an air blow to clean the tool after the replacement or cleaning the cutting oil or cutting chips.

[0005]

However, in the above-mentioned prior art, no processing is performed for abnormalities such as poor connection of the tool to the drive shaft.

[0006] When such a poor joining of the tool occurs, the NC unit is stopped, the joined state of the tool is checked manually, and after the joined state of the tool is returned to a perfect state by hand, machining is performed. It responds by restarting. For this reason, there is a problem that the production line is temporarily stopped and the operation efficiency of the NC device is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. When an abnormality in the state of gripping (joining) of a tool to a drive shaft is detected, the joining conditions at the time of joining the tool are changed. An object of the present invention is to provide a tool joining abnormality processing method for an NC device that releases an abnormal state without stopping the NC device by performing a tool joining operation again.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an automatic tool changer having an air blow function, and a tool joining of an NC apparatus for machining a workpiece based on a control machining program at the time of tool exchange. a method for processing abnormality, when said NC apparatus adhesion failure of the tool in the tool joint has been detected, when performing <br/> back to the tool joined again the tool joint to a state before the tool joint, Start re-start of tool connection
Before changing the air blow conditions and the tool joining speed.
The degree condition is changed .

[0009]

According to the tool joining abnormality processing method of the NC apparatus according to the present invention, when the tool joining abnormality to the drive shaft is detected, the tool joining portion is returned to the position before the tool joining.

Next, the tool joining conditions before the tool joining are changed, the tool joining operation is performed again, and this is repeated until the tool joining becomes normal.

Therefore, without stopping the NC device,
The abnormal connection state between the drive shaft and the tool is released.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a method for treating a tool joint abnormality in an NC apparatus according to the present invention.

FIG. 1 is a block diagram showing a configuration of a control unit of an NC apparatus in which the present invention is implemented.
0 indicates a control unit. The control unit 10 includes a plurality of sensor elements, and each of the sensors 12 detects an abnormality such as tool breakage, abrasion, or bonding failure, an abnormality content determination unit 14 that determines the content of an abnormality signal detected by the sensor 12, If this judgment is an unavoidable tool error such as tool breakage,
An abnormality detection unit 16 that drives an automatic tool changer (not shown) and performs tool change and the like is provided.

Further, in the case of an abnormality that can avoid an abnormal state by performing the joining operation again, such as a poor joining of the tool, the control unit 16 changes the tool joining conditions and re-attachs the tool. Abnormality avoidance control unit 1 that controls to perform joining
8 and a main control unit 20 for controlling the drive unit 22 and processing the workpiece while changing tools by an automatic tool changer as appropriate based on signals output from the abnormality detection unit 16 and the abnormality avoidance control unit 18. .

FIG. 2 is a view showing a schematic configuration of a joint portion between a tool and a drive shaft in the NC device. The tool magazine 30 holding the tool 30a includes spring chucks 36a and 36.
The tool is connected to the drive shaft 32 by b, and the tool is rotated by the spindle motor 34 to perform machining.

When the tool 30a is not joined to the drive shaft 32, that is, when the tool magazine 30 is not joined to the drive shaft 32, the spring chucks 36a and 36b are joined as shown in FIG. The air switch 38 for detecting the state is turned off, and a tool joining abnormality is detected.

Similarly, if the connection between the tool 30a and the drive shaft 32 is defective, the air switch 38 for detecting the connection state of the spring chucks 36a and 36b is turned off, as shown in FIG. Is detected.

On the other hand, when the tool 30a is normally joined to the drive shaft 32, that is, when the tool magazine 30 is normally joined to the drive shaft 32, as shown in FIG. The air switch 38 for detecting the connection state of the chucks 36a and 36b is turned on, and it is detected that the tool connection state is normal.

The NC apparatus according to the present embodiment is basically configured as described above. Next, the operation thereof will be described.

FIG. 4 is a flowchart showing a method for processing a tool joining abnormality. In normal processing, NC equipment
In step S1, a desired machining program is selected,
In step S2, the selected machining program is executed to machine the workpiece. When a tool change is instructed by the selected machining program, a predetermined tool 30a is joined to the drive shaft 32 from the tool magazine 30, and Steps S1 and S2 are repeated.

In step S3, the air switch 38
Based on the output signal (FIG. 3), the joining state between the drive shaft 32 and the tool 30a is checked. If the air switch 38 is turned on and the joining is normal, the execution of the machining program is continued in step S4, and the predetermined machining is performed. When the execution of the program is completed and the machining of the workpiece is completed (step S5),
The operation of the NC device ends.

In step S3, when the joining abnormality of the tool 30a is detected, the abnormality content judging section 14 also checks the state of the other sensors 12 (FIG. 1) to judge whether or not there is a tool abnormality that can be avoided. (Step S6). An unavoidable abnormality such as tool breakage is detected by the abnormality detection unit 16 (FIG. 1).
, The abnormal state is displayed and the NC device stops (step S7).

If the abnormal state determined in step S6 is an abnormality that can be avoided, such as a defective connection of the tool 30a, the abnormality avoiding control unit 18 performs the following control. That is, the abnormality avoidance program is selected in step S8, and the abnormality avoidance program is interrupted (step S9).

In the abnormality avoiding program, first, the tool joining portion is returned from the position at which the poor contact of the tool 30a is detected to the position before the tool joining, and then the joining conditions are changed. The joining conditions include an air blow ejection condition for cleaning cutting chips, cutting oil, and the like, a joining speed of the tool 30a to the drive shaft 32, and an abnormality detection standby time for detecting an abnormality in tool joining.

By changing the joining conditions, for example, the air blowing conditions, the cleaning function of cutting chips and cutting oil at the time of joining the tools is strengthened, and the joining speed of the tool 30a to the drive shaft 32 is changed. By doing so, the impact at the time of joining is reduced. After these joining conditions are changed, the tool joining operation is executed again. In re-executing the tool joining operation, the abnormality detection standby time for detecting an abnormality in the tool joining is extended, and the tool joining condition is changed.

When the tool joining operation is executed again, the process returns to step S3, where the joining state of the drive shaft 32 and the tool 30a is checked based on the output signal of the air switch 38 (FIG. 3). If is not good, the operation from step S6 is repeated.

In the change of the tool joining conditions by the abnormality avoiding program in steps S8 and S9, the conditions of air blow, the joining speed of the tool 30a to the drive shaft 30, and the abnormality detection standby time for detecting an abnormality of the tool joining are changed. However, if any one of the joining conditions is changed, the tool joining is re-executed, and if the joining failure is not eliminated, the other joining conditions are further changed, and the execution of the tool joining is repeated again.

[0028]

According to the method for treating a tool joint abnormality in an NC device according to the present invention, the following effects can be obtained. In other words, when an abnormality in the state of gripping (joining) of the tool to the drive shaft is detected, the joining conditions at the time of joining the tool are changed, and the joining operation of the tool is performed again. The state can be released. Therefore, it is possible to suppress a decrease in the operating efficiency of the manufacturing line including the NC device.

Furthermore, since machining is not performed in a state where the tool is not completely joined to the drive shaft, the machining accuracy is not reduced, and the tool is damaged or damaged.
This has the effect of preventing the occurrence of a serious obstacle such as breakage of the work.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a control unit of an NC apparatus that executes a tool joining abnormality processing method for an NC apparatus according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of a joint between a tool and a drive shaft according to the embodiment shown in FIG. 1;

FIG. 3 is an operation explanatory view of an air switch for detecting a joint state between a tool and a drive shaft according to the embodiment shown in FIG. 1;

FIG. 4 is a flowchart showing a tool joining abnormality processing method of the embodiment shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Sensor 14 ... Abnormal content judgment part 16 ... Abnormality detection part 18 ... Abnormality avoidance control part 20 ... Main control part 22 ... Drive part 30 ... Tool magazine 30a ... Tool 32 ... Drive shaft 34 ... Spindle motor 36a, 36b ... Spring chuck 38 ... Air switch

Claims (2)

(57) [Claims] An automatic tool changer having an air blow function is provided for machining a workpiece based on a control machining program.
A tool joint abnormality processing method at the time of tool change C device, when the NC device adhesion failure of the tool in the tool joint has been detected, again return the tool joint to the state before the tool joint
When performing a tool join, before re-starting the tool join,
Change of air blow condition and change of tool welding speed condition
Tool joint abnormality processing method of the NC apparatus characterized by further performed. 2. The method according to claim 1, wherein the abnormality detection standby time after the tool rejoining is extended .