JPS6035534Y2 - Processing equipment that can detect tool abnormalities - Google Patents

Description

[Detailed description of the invention] The present invention relates to a processing device that is capable of detecting tool abnormalities. This method allows abnormal machining to be performed by the machining equipment itself without having to be inspected at a dedicated inspection station, and also prevents abnormal machining of the workpiece.

In processing equipment that drills holes in workpieces, if a tool such as a drill breaks during processing, or if the tool is installed too short or too long in the tool holder, the workpiece may be damaged. Unable to process objects or drill holes to a specified depth.

Conventionally, an inspection station for inspecting the depth of the hole is provided next to the drilling station to inspect the workpiece after machining, but this increases the number of stations, which is undesirable.

In addition, some processing equipment is equipped with a detection device using an inductance coil that passes through the tool, but this
Since the tool length is detected by changes in the inductance of the coil, it is difficult to accurately measure the tool length, and even if it is possible to detect tool breakage, the tool length may be slightly It was not possible to detect the abnormal installation, which was too long, and in the end the inspection station could not be abolished.

This invention enables the processing equipment to detect abnormalities in the three areas of tool failure, withdrawal, and proper length, and eliminates the need for special inspection stations.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a table, and a workpiece W is positioned on this table 1.

2 is a column erected on the table 1.

A pair of left and right guide bars 3 are attached to the column 2 in parallel in the vertical axis direction, and a slide base 4 is guided by the guide bars 3 so as to be movable forward and backward.

5 is a feeding servo motor that moves the slide base 4 forward and backward.

A machining head 6 is integrally provided on the slide base 4, and a main shaft 7 is rotatably supported on the machining head 6 in the vertical axis direction.

A tool holder 8 is provided at the tip of the main shaft 7, and a tool 9 such as a drill is attached thereto.

7a is a main shaft motor.

The processing head 6 is moved to the retreating end (
It moves forward and backward from the forward end (in the illustration, the rising end) to the forward end (in the illustration, the descending end), but the feed control device 14 causes it to stop midway at a position a certain amount further forward than the backward end, and to a forward deceleration position where cutting feed is started. Further, the feed movement is controlled from the intermediate stop position to the forward position and the backward deceleration position.

LS is a limit switch for confirming the backward end, LS2 is a limit switch for confirming the intermediate stop position, and LS3 is a limit switch for confirming the backward deceleration position, which are operated by the upper dock 24 provided on the slide base 4.

LS4 is a limit switch for forward deceleration position confirmation, LS5
is a limit switch for confirming the forward end, and is operated by a lower dock 25 provided on the slide base 4.

A tool inspection device 10 is installed between the processing head 6 and the workpiece W near the tip of the tool 9 at the intermediate stop position of the processing head 6.

As shown in detail in FIG. 2, the structure of this tool inspection device 10 includes a fixed support member 16 protruding from the front surface of the column 2, and a horizontal axis perpendicular to the axis of the main shaft 7. and the cylinder 12 in a direction parallel to the front surface of the column 2.
and attach the support bracket 1 to the piston rod 18.
7 is fixed.

Reference numeral 19 denotes a detent shaft which is slidably held through the fixed support member 16 with an axis parallel to the piston rod 18, one end of which is coupled to the support bracket 17, and a dock 23 is attached to the other end. It is being

A detection member for the tool 9 is provided at the tip of the support bracket 17.

In the case of the detection member shown in the figure, an insulating block 22 is fixed to the tip of a support bracket 17, and a detecting plate 11 made of a conductor is supported on this insulating block 22 so as to be swingable by a pole 20, and is supported by a spring 21. It has a structure in which it is always pressed toward the insulating block 22 side.

And bolt 20 (conductive material) is the power supply and relay CR1o
It is electrically connected to column 2 via.

In addition to the above embodiments, the detection member may be a limit switch or the like.

The detection plate 11 is driven by the cylinder 12 to a forward end where it is held against the tool 9, as shown by a solid line, and to a backward end, which is far away from the tool 9, as shown by a phantom line.

LS6 is a limit switch for checking the forward end of the detection plate, LS7
is an IJ Mitsutwitch for confirming the backward end of the detection plate, and is operated by the dog 23 at the other end of the rotation prevention shaft 19.

Further, a bend detection plate 13 of the detection plate 11 is fixed to the fixed support member 16.

The tip of this bending detection plate 13 is located at the retreating end position of the detection plate 11, and this tip has a U-shaped notch 13 into which the tip of the detection plate 11 enters, as shown in FIG.
a is formed, and when the detection plate 11 is bent, the detection plate 11 comes into contact with either surface of the notch recess 13a to close an electric circuit.

In FIG. 1, 15 is a tool abnormality determination circuit, and as shown in FIG. It consists of a detection plate bending abnormality signal line (■).

Next, the operation of the present invention will be explained.

The feed cycle of the processing head 6 is at the backward end P as shown in FIG.

The lower dog 25 is moved forward at a faster rate and at the forward deceleration position P3.
turns on the limit switches I and S4, cutting feed is started, and the workpiece W is drilled and moved to the forward end P4.
At this point, the lower dog 25 turns on the limit switch LS5 and moves backward in fast forward motion.

At the backward deceleration position P2, the upper dog 24 turns on the limit switch LS, resulting in slow feed and backward movement.

Next, the upper dog 24 turns on the limit switch LS2 at the halfway stop position P□ of the tool breakage inspection position, and stops halfway.

If the tool is not broken or too short at the tool breakage inspection position, the retreat end P is reached.

is returned and the upper dog 24 turns on the limit switch 6□.
shall be.

It should be noted that the intermediate stop position P1 of the tool breakage inspection position may be in the middle of forward movement instead of in the middle of backward movement.

On the other hand, the tool inspection device 10 operates at the intermediate stop position P1 and the backward end P.

It is operated at the front end of the road, and the rest is located at the reverse end.

Abnormality detection of the tool 9 at the intermediate stop position P1 of the tool breakage inspection position is performed as follows.

When the limit switch LS2 turns NO after confirming the intermediate stop position P1 of the machining head 6, the contact IS2 of the signal line I, which indicates a broken tool or is too short, closes.

Further, the tool inspection device 10 is positioned at the forward end due to the forward movement of the piston rod 18 of the cylinder 12 and the forward movement of the support bracket 17 provided with the detection plate 11 as shown by the solid line in FIG.

At the forward end of this tool inspection device, the limit switch LS6 is turned on by the dog 25 attached to the other end of the detent shaft 19 that moves together with the support bracket 17, and the contact 1S6 is closed.

At the forward end of this tool inspection device 10, when the tool 9 is normal, the limit switch LS6 is activated to contact IS6.
Before the relay C is closed, the detection plate 11 engages with the tip of the tool 9 as shown by the solid line in FIG. 5a, and the electric circuit is closed.
Since R1o turns ON and the normally closed contact Cr1o opens, no abnormality signal is sent. However, if the tool 9 is broken or too short, the detection plate 11 will naturally not engage with the tool 9, so the relay CR1o will not be activated. remains OFF, normally closed contact Cr1o remains closed, and relay CR2o is turned ON to transmit an abnormality signal.

Relay at the same time again! When 5CR2o turns on, contact Cr2o closes and is self-held.

Next, the retreat end P of the processing head 6.

Detection of an abnormality in the tool 9 being too long is performed by checking the retreat end Po of the machining head 6 and turning on the limit switch LS□.
Then, the contact 1s1 of the tool too long signal line (■) closes.

Since the tool inspection device 10 is at the forward end position, the contact Is6 is already in a closed state.

Here, when the length of the tool 9 is normal, the detection plate 11 does not engage with the tool 9 as shown by the solid line in Figure 5, so the relay CR,o is OFF, and the normally open contact Cr1o is open. If the tool remains as long as it is, no abnormality signal is sent, but if the tool 9 is too long or abnormal, the detection plate 11 engages with the tip of the tool 9, so the relay CR3o goes ONE and sends an abnormality signal that the tool is too long, and at the same time, the contact Cr5o closes and retains itself.

As described above, the tool 9 is simultaneously detected for breakage and expulsion, and the appropriate length of the tool 9 is inspected.

At times other than the above-mentioned inspection, the tool inspection device 10 is at the avoidance position at the retreat end.

At this time, the detection member is a conductive detection plate 11 as shown in the figure.
Inspect for abnormal bending.

In the case of the detection plate 11, it is conceivable that the operator may apply excessive force to the detection plate 11 when replacing the tool 9, causing it to bend vertically or warp back.

If the detection plate 11 is bent, it is impossible to correctly inspect the tool 9 for abnormalities, so it is desirable to also inspect the detection plate 11 for abnormalities.

Therefore, in this inspection, the tip of the detection plate 11 bends at the notch recess 1 of the detection plate 13 at the retreating end of the tool inspection device 10.
3a, and when the detection plate 11 is bent, it contacts any of the three sides of the cutout recess 13a, thereby closing an electric circuit.

That is, when the limit switch LS7 is turned on by confirming the backward end of the tool inspection device 10, the contact IS7 of the detection plate bending abnormality signal line (2) closes.

When the detection plate 11 is normal, it does not contact the notch recess 13a, so the relay CR1° is in the OFF state and the contact Cr1o is closed.
remains open and no abnormality signal is transmitted, but when the detection plate 11 is bent, it comes into contact with the cutout recess 13a and the electric circuit is closed, turning on the relay CR1o.

This closes the contact Cr1o and turns the relay CR,o to O.
At the same time as it becomes N and sends a bending abnormal signal, contact cr.
.

closes and retains itself.

Furthermore, SW1. SW2. SW3 connects each signal line I, n,
This is a switch that resets the self-holding circuit of m.

As described above, the processing device according to the present invention can automatically detect not only broken and short tools, but also tools that are too long, so there is no need for an inspection station to inspect abnormal machining of the workpiece, and If abnormalities in the tool are detected before machining the object, abnormal machining of the workpiece can be prevented and the workpiece will not be wasted.

In addition, since the detection is based on the tool, the tool length can be determined accurately and easily, resulting in stability.

Furthermore, the tool inspection device is moved to an avoidance position from the forward/backward path of the machining head except when detecting a tool abnormality.
It has the effect of being able to obtain a large amount of advance without interfering with the processing head.

[Brief explanation of the drawing]

Fig. 1 is a front view of the device of the present invention, Fig. 2 is an enlarged view taken along the line A-A in Fig. 1, Fig. 3 is a feed cycle diagram of the processing head, and Fig. 4
The figure is a tool abnormality determination circuit diagram, Figure 5a is a diagram of tool breakage and leaving inspection status, Figure 5 is a diagram of tool overload inspection status, and Figure 6 is a diagram of tool overload inspection status.
The figure is a diagram showing the detection state of the detection plate bending. 1...Table, 2...Column, 6.
...Machining head, 7...Main spindle, 8...
...Tool holder, 9...Tool, 10...
...Tool inspection device, 11...Detection plate, 12...
...Cylinder, 14...Feed control device, 1
5... Tool abnormality determination circuit.

Claims (1)

[Scope of utility model registration request] A feed control device that stops a machining head that moves forward and backward at a predetermined forward position from the backward end of the original position, and a direction perpendicular to the direction of forward and backward movement of the machining head at a predetermined position between the workpiece and the machining head. a tool inspection device equipped with a detection member that can move forward and backward and electrically detect whether the tool is engaged or not engaged with the tool; A drive device moves the tool forward toward the tool side, detects breakage or withdrawal of the tool by disengagement between the detection member and the tool at an intermediate stop position of the processing head, and detects engagement between the detection member and the tool at the retreating end of the processing head. A processing device capable of detecting tool abnormality, which is equipped with a tool abnormality determination circuit that detects the appropriate length of the tool when the tool is in the correct length.