JPS63200945A - Indexing controller for machine tool - Google Patents

Abstract

PURPOSE:To detect an indexing miss automatically as well as to prevent a workpiece from being unmachined, by rotating a dividing plate further clockwise as much as one division after calculation of the specified indexing frequency of an index commanding device and, after judging operating frequency of a zero switch, reversing and resetting it to the zero position. CONSTITUTION:First a dividing plate 5 is reset to a zero position, and a zero switch 24 is turned off at the side of right clockwise rotation with a zero dog 5a. Next, when index numbers N equivalent to the number of teeth of a workpiece 6 is inputted into a setting means 20 and set to an index frequency calculating means 22, an index commanding means 21 rotates the dividing plate 5 and the work 6 clockwise as much as one division, thus machining is carried out by a cutter 8. At this time, the zero switch performs its on-off operation for the first time, setting N-1 with the index frequency calculating means 22 and indexing this N-1 till it becomes N=0, thus machining is repeated. And, when it becomes N=0, the dividing plate is further rotated clockwise as much as one division portion, and a fact that whether the zero switch 24 is turned on or off two time or not is judged by a judging means 27, and when it is less than two times, abnormality is displayed by a trouble displaying means 29, but if it is more than two times, the dividing plate is reset to the zero position. Thus, an unmachined work is detectable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a machine tool, and more particularly to an indexing control device for a machine tool that drives and controls an indexing plate to divide a workpiece into a predetermined number of equal parts. It is.

(Prior art) In general, those that perform index control with feedback,
The control device becomes expensive and the processing speed decreases.

For this reason, index control devices that employ open-loop control with simplified feedback control are often used.

Incidentally, an NG control device for a general machine tool employing this type of index control device is shown in FIG.

That is, an arithmetic control circuit (CP) such as a microcomputer
NG control unit 1 with a built-in NG control unit 1, an operation panel 2 that performs various processing data setting input functions and various display functions, an indexing drive unit 3 that drives an indexing plate, and a processing machine drive that drives the processing device. It has part 4.

Then, the NC control section 1 outputs various NG commands related to each other to the index drive section 3 and the processing machine drive section 4, and thereby the index drive section 3 outputs various NG commands for driving the index plate 5. The pulse motor M1 is driven and controlled, and in connection with this, the processing machine drive section 4 drives the workpiece 61i! The clamp cylinder M2 for illumination, the motor M3 for feeding the workpiece 6, the motor M4 for moving the spindle head 7N, etc. are each driven and controlled, and the workpiece 6 is sequentially divided into equal parts by the cutter 8. There is.

By the way, in the conventional control of the index drive section 3, the fifth
It was as shown in the figure.

That is, a division number setting means 10 is provided which intermittently emits a signal according to the preset number of divisions of the indexing plate 5 (workpiece 6), and each time the signal from the division number setting means 10 is input, the division number is set. indexing command means 11 that issues an indexing signal in the normal rotation direction corresponding to one division of the indexing plate 5 to the indexing drive unit 3 that drives the indexing plate 5;
and an indexing number calculation means 12 which issues an origin return signal when the number of indexing signals from the indexing command means 11 reaches a predetermined value. The index drive section 3
There is an indexing control device which is provided with a home return command means 13 which issues a signal in the normal rotation direction.

Note that the processing machine drive section 4 shown in FIG.
Each time the machine is driven once, the machine is operated for one machining cycle according to a command from the NC control section 1 described above, and the workpiece 6 is machined one tooth at a time.

(Problems to be Solved by the Invention) In the above conventional method, for example, during N processing steps, the pulse motor M1 for driving the indexing plate 5 may cause an indexing error due to some kind of overload, that is, the indexing plate Even if the number of times the indexing plate 5 is driven is less than a predetermined number, if the number of indexing times calculation means 12 becomes a normal number, the return-to-origin commanding means 13 causes the indexing plate 5 to return to its origin. There was a drawback that machining could not be detected.

Furthermore, the direction of rotation of the index plate 5 during the return-to-origin operation is as follows:
Because it was in the same direction as the rotation direction of the index plate 5 during processing, during the return-to-origin operation.

Immediately after the origin switch 15 is actuated, the index plate 5 rotates approximately one more rotation, which has the disadvantage that this return-to-origin operation takes time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an indexing control device for a machine tool that can automatically detect indexing errors to prevent workpieces from being left unprocessed, and can quickly return an indexing plate to its origin.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, each time a signal from the division number setting means is input, the indexing command means issues an indexing signal corresponding to one division to the indexing drive unit that drives the indexing plate, and the indexing command means outputs an indexing signal corresponding to one division. an indexing number calculation means for issuing an additional signal when the number of indexing reaches a predetermined value; an additional indexing command means for receiving the additional signal and issuing an indexing signal corresponding to one division to the indexing drive section; A storage means for storing the detection signal of the origin switch activated by driving the plate, a determination means for inputting signals from the additional indexing command means and the storage means to issue an abnormality signal or a return-to-origin signal, and this determination means When the origin return signal is received, the origin return command means is provided which issues a reverse rotation signal to the indexing drive unit until the origin switch detection signal is input.

(Function) Since the present invention has the above configuration, when the number of times of indexing reaches a predetermined number, the indexing plate is rotated by one division additionally by the additional indexing command means. You will need to check whether it is working or not.

If the origin switch is activated, the 1 index plate is operated to return to its origin, and if it is not activated, it is determined that there is an abnormality.

Further, the return operation of the index plate to the origin is performed by rotating the index plate in the opposite direction to the direction used when processing the workpiece by the origin return command means.

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

In the drawings, Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a flowchart thereof, Fig. 3 is an explanatory diagram showing the operating state of the index plate and the workpiece, and Fig. 4 is a diagram showing the machine tool and N.
It is an explanatory view showing a relationship with a G control device.

As described above, FIG. 4 has an NG control device consisting of the NC control section 1, the operation panel 2, the index drive section 3, and the processing machine drive section 4, and from the NG control section 1, the index drive section 3 and the processing machine drive unit 4, and thereby drive and control the pulse motor M1 for driving the indexing plate 5 in the indexing drive unit 3. Clamp cylinder M2 for fixing the workpiece 6 in the processing machine drive unit 4
, a motor M3 for feeding the workpiece 6, a motor M4 for driving the spindle head 7, etc., respectively, so that the workpiece 6 is sequentially divided into equal parts by the cutter 8.

FIG. 1 shows an indexing control device built into the NG control device, which will be explained in conjunction with FIG. 4.

20 is a division number setting means, and this division number setting means 20
inputs the number of divisions (N) corresponding to the number of divisions of the workpiece 6 held by the clamp cylinder M2 of the machine tool, and issues the index command means 21 and the machining command at a predetermined timing according to this number of divisions (N). A signal is issued to the means 30.

Each time the index command means 21 receives a signal from the division number setting means 20, it sends an index signal in the forward direction corresponding to one division of the index plate 5, that is, a pulse signal, to the index drive unit 3. The indexing plate 5 and the workpiece 6 interlocked therewith are rotated in the forward rotation direction by one division.

The machining command means 30 also controls the motors M3 and M4 on the machine tool side each time a signal from the division number setting means 20 is input.
etc., and the workpiece 6 is machined by one tooth by the cutter 8.

The indexing signal from the indexing command means 21 is calculated at any time by the indexing number calculation means 22, and the number of indexing is determined to be a predetermined value (N
), a signal is issued to the additional indexing command means 23, which issues an indexing signal in the forward rotation direction corresponding to one division to the indexing drive section 3, and thereby the indexing signal is outputted via the pulse motor M1. The protruding plate 5 is rotated in the forward direction by one division.

On the other hand, the index plate 5 is provided with an origin switch 24 that is activated when the index plate 5 passes the origin, and the operation is detected by the origin switch detection means 25 and is stored in the storage means 26. Remember.

Then, the determination means 27 determines that the additional index command means 23
and storage means 26, and determines both signals. If normal, a return signal is issued to the origin return command means 28, and if abnormal, an abnormality signal is issued to the abnormality display means 29. .

The origin return commanding means 28 issues a reverse rotation signal to the indexing drive section 3, which causes the indexing plate 5 to move through the pulse motor M1.
The reverse rotation signal is stopped when the origin switch detection means 25 confirms the operation of the origin switch 24.

Next, the operation of the above control device will be explained with reference to FIGS. 1 to 3.

First, an origin return cycle is executed to return the index plate 5 to the origin position A as shown in FIG.

The origin switch 24 is turned off on the direct pressure rotation side of the origin dog 5a provided on the index plate 5.

In this state, the clamp cylinder M2 is operated to lock the workpiece 6 to the holder interlocked with the index plate, and the NG control device is started (step 50).

Next, the number of divisions (N) corresponding to the number of teeth of the workpiece 6, for example 5, is input to the division number setting means 20, and this division number (N) is set as a counter in the indexing number calculation means 22 (step 51). .

Then, the indexing command means 21 inputs the signal from the division number setting means 20 to the indexing drive unit 3 (pulse motor Ml).
An indexing signal in the forward rotational direction for the division is issued to rotate the indexing plate 5 and the workpiece 6 in the forward rotational direction, and in this state, the machining command means 30 inputs the signal from the division number setting means 20 and starts machining. A processing signal for machining one tooth is sent to the machine drive unit 4, motors M3, M4, etc. on the machine tool side are driven, and the cutter 8 processes the first index portion of the workpiece 6 (steps 52 and 53).
be done.

At this time, the origin dog 5a moves from position A to position B as shown in FIG.
The origin switch 24 is turned on and off for the first time, and the result is stored in the storage means 26.

Next, the 1 index calculation means 22 subtracts 1 from the division number (N) and sets the counter (N-1) as the set value.
Step 54).

Next, the indexing command means 21 inputs the signal from the division number setting means 20 and issues an indexing signal in the forward rotation direction for the -division to the indexing drive unit 3 (pulse motor Ml), whereby the indexing plate 5
Then, the workpiece 6 is rotated in the forward rotation direction to start indexing (step 55), and when it has rotated by an angle corresponding to -division, the indexing plate 5 is stopped and indexing is completed (step 56). .

Next, the indexing number calculation means 22 determines that the set value of the counter is O.
It is determined whether or not it has become O (step 57), and the steps 52 to 56 described above are repeated to sequentially process each index portion (K2, K3, . . .) of the workpiece 6 until it becomes O.

When the set value of the counter reaches 0, the additional indexing command means 23 issues an indexing signal in the forward rotation direction corresponding to one division to the indexing drive unit 3, and the indexing plate 5 (Workpiece 6) is rotated by one division in the forward direction (Step 58
・59) Let.

At this time, the origin dog 5a moves from position A to [B] in FIG.
The origin switch 24 is turned on and off for the second time, and is stored in the storage means 26.

Then, the determination means 27 receives the signal from the storage means 26 and determines whether or not the origin switch 24 has been turned on and off twice (step 60).

When the origin switch 24 is turned on and off less than twice, the determination means 27 issues an abnormality signal to the abnormality display means 29, which displays the abnormality (step 61).

In other words, if the indexing drive unit 3 is operating normally, the indexing plate 5
(Work 6) has its dog 5a at position [B] in FIG. 3 when the signal is issued from the additional indexing command means 23, and the origin switch 24 has been activated twice. Therefore, if this occurs less than twice, it means that a regular machining cycle was not performed.

Further, if the origin switch 24 has been turned on and off twice, the determination means 27 issues a return signal to the origin return command means 28, which in turn issues a reverse rotation signal, that is, a drive pulse, to the index drive section 3. When the index plate 5 is reversed via the pulse motor M1 (step 62) and the origin switch 24 is turned on (step 63), the period of the drive pulse is changed to reduce the reversal speed (step 64). When the origin switch 24 is turned off (step 65), that is, when the dog 5a of the index plate 5 reaches position A in FIG. 3, the pulse motor M1 is stopped and the return to origin is completed (step 6).
6) and stop the Canadian program (step 67).
let

(Effects of the Invention) As is clear from the above description, the present invention rotates the indexing plate forward by one division after calculating the predetermined number of indexing by the indexing command means, and in this part, the origin switch is activated. After determining the number of operations, the index plate is reversed to return to the origin.

With a simple control device, it is possible to detect whether or not the workpiece is unprocessed, and it is possible to quickly return the index plate to the origin.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a flowchart thereof, Fig. 3 is an explanatory diagram showing the operating state of the indexing plate and the workpiece, and Fig. 4 is a diagram showing the relationship between the machine tool and the NG control device. An explanatory diagram showing the relationship, FIG. 5 is a block diagram showing a conventional indexing control device. 1: NC control section, 2: Operation panel, 3: Index drive section, 4: Processing machine drive section, 5: Index plate, 6: Workpiece, 7: Spindle head, 8: Cutter, Ml: Pulse motor, M2 : Clamp cylinder, M3/M4: Motor. 20: Division number setting means, 21: Index command means, 22: Index number calculation means, 23: Additional index command means, 24: Origin switch, 25: Origin switch detection means, 26: Storage means, 27: Judgment Means, 28: Origin return command means, 29:
Abnormality display means, 30: Processing command means. Application agent Hisada Matsumoto Figure 3

Claims (1)

[Claims] 1. An indexing command means that issues an indexing signal corresponding to one division to an indexing drive section that drives an indexing plate each time a signal from the division number setting means is input; an indexing number calculation means for issuing an additional signal when the number of indexing reaches a predetermined value; an additional indexing command means for receiving the additional signal and issuing an indexing signal corresponding to one division to the indexing drive section; A storage means for storing the detection signal of the origin switch activated by driving the plate, a determination means for inputting signals from the additional indexing command means and the storage means to issue an abnormality signal or a return-to-origin signal, and this determination means 1. An index control device for a machine tool, comprising: a return-to-origin command means for issuing a reverse rotation signal to an index drive unit when a return-to-origin signal is received from the origin switch until a detection signal from an origin switch is input.