JPH05169347A - Abnormal tool joining method for NC device - Google Patents

Abstract

(57) [Summary] [Purpose] When an abnormality in the welding state of the tool to the drive shaft is detected, the welding conditions are changed at the time of welding the tool and the NC operation is stopped again by performing the welding operation of the tool. An object of the present invention is to provide a tool joining abnormality processing method for an NC device that cancels an abnormal state without causing the abnormality. [Constitution] When a joining abnormality of a tool joining portion is detected (step S3), an abnormality avoidance program is interrupted and executed (step S9), and the tool joining portion before the tool joining is detected from the time when a poor contact of the tool is detected. Return to position. Next, the tool joining conditions such as the air blow ejection condition, the tool joining speed, and the abnormality detection waiting time after the tool joining are changed, the tool joining operation is performed again, and the tool joining conditions and the tool joining are performed until the tool joining becomes normal. Perform the action multiple times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool joining abnormality processing method in an NC device, and more specifically,
When an abnormality in the state of gripping (joining) the tool on the drive shaft is detected, the tool joining abnormality processing of the NC device is performed in which the joining condition is changed and the joining operation under the changed joining condition is repeated until the abnormal state is released. Regarding the method.

[0002]

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

In the NC device, the quality of the tool (cutting tool) is checked before and after machining, and a tool abnormality such as wear or breakage of a tool such as a drill is detected during machining. In this case, for example, JP-A-54-10
As described in Japanese Patent Publication No. 483, an ATC (automatic tool changer) automatically performs tool change, and processing is performed at the time of a tool joining abnormality such that machining work is continued.

Tool exchange is performed, for example, in Japanese Utility Model Publication No. 61-353.
No. 92 publication, the cutting waste adheres to the tool joint when the tool is replaced,
In order to prevent the incomplete joining of the tool to the drive shaft, an air blow is jetted to wash the tool after replacement, or after cleaning cutting oil and cutting debris, the tool is replaced.

[0005]

However, in the above-mentioned conventional technique, no processing is performed for an abnormality such as a defective joining of the tool to the drive shaft.

Further, when such a defective joining of the tool occurs, the NC device is stopped, the joining state of the tool is manually checked, and the joining state of the tool is returned to a perfect state by hand, and then the machining is performed. We are taking measures such as restarting. Therefore, there is a problem that the production line is temporarily stopped and the operation efficiency of the NC device is reduced.

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

[0008]

In order to achieve the above-mentioned object, the present invention provides a tool joining abnormality processing method for an NC device which is equipped with an automatic tool changer and processes a workpiece based on a control machining program. A first step of returning the tool joining part to a position before tool joining when a poor tool adhesion is detected in the tool joining part of the NC device; a second step of changing the previous tool joining conditions; After the completion of the second step, a third step of performing a tool joining re-operation, and a fourth step of executing the second step and the third step a plurality of times until the tool joining is in a normal state. It is characterized by consisting of.

[0009]

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

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

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

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tool joining abnormality processing method for an NC device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a control unit of an NC device in which the present invention is implemented.
0 indicates a control unit. The control unit 10 is composed of a plurality of sensor elements, and includes a sensor 12 for detecting an abnormality such as breakage, wear, and joint failure of a tool, and an abnormality content determination unit 14 for determining 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 is provided which drives an automatic tool changer (not shown) to change tools.

Further, in the case of an abnormal condition in which the abnormal state can be avoided by performing the welding operation again, such as a defective welding of the tool, the control unit 16 changes the tool welding condition and restarts the tool operation. Abnormality avoidance control unit 1 controlling to perform joining
8 and a main control unit 20 for controlling the drive unit 22 and machining a workpiece while appropriately exchanging tools by an automatic tool changer based on signals output from the abnormality detection unit 16 and the abnormality avoidance control unit 18. ..

FIG. 2 is a diagram showing a schematic structure of a joint between a tool and a drive shaft in the NC device. The tool magazine 30 holding the tool 30a is a spring chuck 36a, 36.
It is joined 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. 3 (a). The air switch 38 for detecting the state is turned off, and a tool joining abnormality is detected.

Similarly, when the joint between the tool 30a and the drive shaft 32 is defective, the air switch 38 for detecting the joint state of the spring chucks 36a and 36b is turned off as shown in FIG. To be 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 joining state of the chucks 36a and 36b is turned on, and it is detected that the tool joining state is normal.

The NC device according to this embodiment is basically constructed as described above, and its operation will now be described.

FIG. 4 is a flow chart showing a method for abnormal processing of tool joining. In normal processing, the NC device
In step S1, select the desired machining program,
In step S2, the selected machining program is executed to machine the workpiece. When a tool replacement is instructed by the selected machining program, a predetermined tool 30a is joined to the drive shaft 32 from the tool magazine 30, The operations of step S1 and step S2 are repeated.

In step S3, the air switch 38
The welding signal between the drive shaft 32 and the tool 30a is checked by the output signal of (FIG. 3), and if the air switch 38 is turned on and the welding 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 the step S3, when the joining abnormality of the tool 30a is detected, the abnormality content judgment unit 14 also checks the states of the other sensors 12 (FIG. 1) to judge whether or not the tool abnormality can be avoided. (Step S6). Abnormalities that cannot be avoided, such as broken tools, are detected by the abnormality detection unit 16 (Fig. 1).
When detected by, the abnormal state is displayed and the NC device is stopped (step S7).

If the abnormal state determined in step S6 is an abnormality that can be avoided, such as a defective joint of the tool 30a, the abnormality avoidance control section 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 avoidance program, first, the tool joining portion is returned from the position at the time when 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 ejection conditions of air blow for cleaning cutting chips and cutting oil, joining speed of the tool 30a to the drive shaft 32, and an abnormality detection standby time for detecting an abnormality in the tool joining.

By changing the welding conditions, for example, the air blow ejection conditions, the cleaning function of cutting chips and cutting oil at the time of welding the tools is enhanced, and the welding speed of the tool 30a to the drive shaft 32 is changed. By doing so, the impact at the time of joining is alleviated. After these welding conditions are changed, the tool welding operation is executed again. When the tool joining operation is re-executed, 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, the joining state of the drive shaft 32 and the tool 30a is checked by the output signal of the air switch 38 (FIG. 3), and the joining is performed when the air switch 38 is off. If is not good, the operations in and after step S6 are repeatedly executed.

In changing the tool joining conditions by the abnormality avoidance program in steps S8 and S9, the ejection condition of the air blow, the joining speed of the tool 30a to the drive shaft 30, and the abnormality detection waiting time for detecting the 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.

[0028]

EFFECTS OF THE INVENTION According to the tool joining abnormality processing method of the NC device according to the present invention, the following effects can be obtained. That is, when an abnormality in the state of gripping (joining) the tool to the drive shaft is detected, by changing the joining condition at the time of joining the tool and performing the joining operation of the tool again, the abnormality is caused without stopping the NC device. The state can be released. Therefore, it is possible to prevent a decrease in the operating efficiency of the manufacturing line including the NC device.

Further, since the machining is not performed in a state where the tool is incompletely joined to the drive shaft, the machining accuracy is not deteriorated, and the tool is damaged or
It is possible to prevent the occurrence of a serious obstacle such as breakage of the work.

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

 12 ... Sensor 14 ... Abnormality 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 (3)

[Claims] 1. A method for abnormally joining a tool in an NC device, which is equipped with an automatic tool changer, and which processes a workpiece based on a control machining program, wherein when a tool adhesion defect is detected in a tool joint portion of the NC device, A first step of returning the tool joining part to the position before tool joining, a second step of changing the previous tool joining conditions, and a third step of performing a re-operation of tool joining after the end of the second step. And a fourth step of performing the second step and the third step a plurality of times until the tool joining is in a normal state. 2. The method according to claim 1, wherein the change of the welding condition includes changing at least one of an air blow ejection condition before tool welding, a tool welding speed, and an abnormality detection waiting time after tool welding. A method for abnormally treating a tool joint of an NC device which is a feature. 3. The method according to claim 1, wherein the welding conditions are changed by changing an air blow ejection condition before tool welding, changing a tool welding speed, and extending an abnormality detection waiting time after the tool welding. A tool joining abnormality processing method for an NC device, which is characterized in that it is performed.