JP2563423Y2 - Biting tool extraction device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to an AT such as a machining center.
The present invention relates to an automatic extracting device for a tool biting into a tapered hole of a machine tool with C.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, a tool 103 having a pull stud 102 at a rear end is mounted on a tapered hole 101a of a main shaft 101 of a machining center. The tool 103 may bite into the tool. If the degree of this bite is large,
The tool pull bar 105 is pushed out by the hydraulic cylinder 104 in response to the tool unclamping signal, and the pull stud 102 does not come off even if the pull stud 102 is hit with the tip hammer 105a, so that the exchange arm 106 cannot be pulled out. When the extraction completion signal is not output within the time set in the extraction time comparison section 107, an alarm signal is output from the alarm stop signal output section 108, and a safety device for stopping the alarm of the machine is incorporated in the NC. .

[0003]

The safety device described in the prior art for stopping an alarm due to the inability to perform a single tool removal operation may frequently stop the machine at an unexpected time. If it occurs during operation by an operator or unmanned, there is a problem that the production schedule will be significantly messed up, and even if the operator notices immediately, hit the tool with a wooden hammer etc. There is a problem in that the time and effort for removing the material are great. The present invention has been made in view of such problems of the prior art,
The purpose is to provide a bite-equipped tool extraction device that automatically taps a tool with a hammer at the tip of a tool pull-up rod a predetermined number of times when a tool bite occurs. It is.

[0004]

In order to achieve the above-mentioned object, a biting tool extracting device according to the present invention comprises an ATC.
Tool clamp to clamp the tool mounted on the main shaft of the machine tool
Tool with the piston of the hydraulic cylinder located at the rear end of the bar
A device that preparative disconnect the tool with eating the tapered hole by striking the tool through the pull rod, pressure oil to the hydraulic cylinder
Check that the solenoid-operated directional control valve for turning on / off the supply oil
Confirmation means and complete removal of the preset spindle tool
To detect if the tool has been removed within the specified time
Detecting means and if no pull-out completion signal is output from the detecting means
The means for operating the electromagnetic switching valve is turned on and off at regular intervals.
Completed withdrawal from on / off signal output means and the detection means
Reset when no signal is output
The set number of counters that counts at regular intervals
When the signal from the confirmation means is not input into the
Alarm stop signal to stop ATC operation
Output means .

[0005]

[Function] If the tool does not bite into the spindle taper hole and the set time elapses and the tool extraction complete signal is not output, a tool extraction hammer operation retry signal is output and the tool clamp / unclamp operation is continuously performed the set number of times. Then, hit the head of the pull stud of the tool with the hammer at the tip of the tool pulling rod to release the bite. If the hammering operation is not performed even after the set number of hammer operations, the alarm is stopped.

[0006]

An embodiment will be described with reference to FIGS. A spindle sleeve 2 is provided on a spindle head 1 of a known machining center so as to be movable in an axial direction, and a spindle 3 is rotatably supported by a plurality of bearings on the spindle sleeve. The through hole of the main shaft 3 has a tapered hole 3 at the tip.
a, the rear end of which is formed in a large-diameter hole for the disc spring 4. A tool T having a pull stud Ta at the rear end is detachably attached to the tapered hole 3a, and a tool pulling rod 6 having a collet 5 which can be opened and closed at the front end of the through hole of the spindle sleeve 2 for gripping the pull stud Ta is provided. The tool pulling rod 6 is constantly urged by the disc spring 4 to be pulled up.

A hydraulic cylinder 7 is fixed to the rear end of the spindle sleeve 2 concentrically, and a piston rod 9 having a piston 8 of the hydraulic cylinder 7 is fitted concentrically and axially movable with respect to the spindle axis. I have. The piston rod 9 is connected to the spring 1 stretched in the front chamber of the hydraulic cylinder 7.
1 is always urged to pull in, and a dog 12
Is fixed so as to be movable, and a clamp / unclamp confirmation limit switch LS is provided at a corresponding position on the spindle head.
1, LS2 are attached. On the other hand, a tool changing arm unit 13 is provided on the side surface of the spindle head 1, and a twin arm type changing arm 14 is provided in the tool changing arm unit.
Are provided so as to be able to turn around the turning shaft 15 and to be able to move in and out in the direction of the turning shaft. Further, an electromagnetic switching valve 16 is provided in the middle of the pipeline between the rear chamber of the hydraulic cylinder 7 and the hydraulic pressure source P, and a solenoid SOL1 of the electromagnetic switching valve 16 is provided.
And the tool change arm unit 13 in cooperation with the tool T
A control system for extracting the data is built in the NC device.

FIG. 1 is a block diagram showing this control system. A tool change command interpreting unit 17 interprets the transmitted tool change command and sequentially requires a series of tool change operation commands. The part to output to the location. The tool extraction signal output unit 18 outputs a signal for moving the exchange arm 14 forward in the direction of the pivot axis. Replacement arm axial drive unit 19
Is a part for driving the exchange arm 14 in the pivot axis direction. The tool clamp / unclamp signal output unit 21 is provided with the electromagnetic switching valve 1
6 is a part for turning on or off the voltage applied to the SOL. Sampling time comparison unit 22, from the out tool extraction signal, exchange arm 14 can contact with preset <br/> time required for tool withdrawal operation during ATC operation cycles until complete complete extraction, outputs over time signal when no out completion signal sampling within Kaname Tokoro time and outputs the next cycle continuation signal when completion signal sampling within the required time comes portion.

The tool removal hammer operation retry command output unit 23 outputs a hammer operation retry command in response to the overtime signal. The ON / OFF repetition signal output unit 24 turns ON / OFF the voltage applied to the SOL of the solenoid valve 16 at regular intervals by using the retry signal. When the number of hammer times exceeds the preset number of times stored in the hammer, the number-of-hammers-number comparing section 25 outputs an over-number signal to the alarm stop signal output section 26 to stop the machine in the alarm, and outputs a sampling confirmation signal within the set number. In this case, the section sends a stop signal to the hammer operation stop signal output section 27 to stop the hammer operation, and outputs a signal for continuing the ATC operation by outputting a next cycle continuation signal.

Next, the operation of this embodiment will be described in the order of the flowchart of FIG. In step S1, when a tool exchange command is issued from the NC, in step S2, the exchange arm 14 turns substantially 90 ° to grip the tool T, and in step S3, hydraulic oil is supplied to the rear chamber of the hydraulic cylinder 7. , The piston 8 and the piston rod 9 move forward against the force of the spring 11, the tool pulling rod 6 is pushed out against the force of the disc spring 4, and the collet 5 at the tip opens to release the gripping of the tool T. Then, the head of the pull stud Ta is hit with the hammer 6a at the tip of the tool pulling rod 6. Next, in step S4, the exchange arm 14 extends in the axial direction to start extracting the tool T. In step S5, it is confirmed whether or not the extraction completion signal has been output within the set time, and the tool T bites into the tapered hole 3a of the main shaft 3. If it cannot be removed, the determination is NO, and in step S6, the counter in the hammer frequency comparison unit 25 is reset to n = 0.

Next, at step S7, a tool removal hammer operation retry signal is output, and the SOL of the electromagnetic switching valve 16 is reset.
The voltage applied to is automatically ON / OFF, the tool clan <br/> flop and unclamping are performed once, in step S8, the counter is set to n + 1. Next, in step S9, it is confirmed whether or not a sampling completion signal has been output by the limit switch LS2.
In, it is checked whether the value of the counter is equal to or less than the set number of times. If YES, the process returns to step S7. If NO, the alarm is stopped in step S11.
If YES is obtained in steps S5 and S9, the next cycle is continued in step S12.

[0012]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. When the tool is stuck in the main shaft taper hole and cannot be removed by ATC operation, the tool clamp / unclamp is automatically repeated a predetermined number of times, and the head of the tool pull stud is hit with the tip of the tool pulling rod to remove it. , Machine stoppage due to biting tools is greatly reduced, and unmanned operation can be performed with peace of mind.
The process can be completed on schedule with a small number of workers or unattended.

[Brief description of the drawings]

FIG. 1 is a structural diagram around a main axis of a machining center including a block diagram of a hammer operation retry circuit of the present embodiment.

FIG. 2 is a flowchart for explaining the operation of the embodiment.

FIG. 3 is a structural diagram around a main shaft of a machining center including a block diagram of a conventional alarm stop circuit when a biting tool occurs.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spindle head 2 Spindle sleeve 4 Disc spring 5 Collet 6 Tool extraction bar 6a Hammer part 7 Hydraulic cylinder 13 Tool exchange arm unit 14 Exchange arm 16 Solenoid switching valve 23 Tool removal hammer operation retry command output part 25 Hammer count comparison part T Tool Ta Pull stud

Claims (1)

(57) [Scope of request for utility model registration] 1. A tool mounted on a main shaft of a machine tool with an ATC.
Hydraulic series located at the rear end of the tool
Through the tool pull rod in the piston of Sunda Apparatus that preparative disconnect the eating with tool to Te <br/> over path hole by hitting a tool, the
Solenoid switching valve that turns on and off the oil supply passage of pressure oil to the hydraulic cylinder
And confirmation means for confirming tool removal
Tool removal is completed within the complete removal time of the spindle tool
Detection means for detecting whether the
Activate the solenoid-operated directional control valve when no punching completion signal is output.
On / off signal output means for turning on / off means at a constant interval;
Reset when the pull-out completion signal is not output from the detection means.
Counting at the ON / OFF of the ON / OFF signal output means at a constant interval.
Signal from the checking means within the set number of
Stops ATC operation when tool is not input
A biting tool extracting device, comprising: an alarm stop signal output means for stopping the tool.