JPS58206366A - Process for returning table to origin in nc machine - Google Patents

Abstract

PURPOSE:To establish a precise origin by deciding an operational condition of an origin draw-in switch each during deceleration of a machine and upon end of decelaration of same by a deceleration command switch, and halting return of the machine to the origin in dependence upon a result of such a decision. CONSTITUTION:A table is moved at a high speed on the basis of movement command from a control section 13, and when a deceleration command switch is operated to go on, a deceleration command signal DS is inputted to the control section 13. As a result, the control section 13 acts to decide whether or not an origin draw-in command signal HS is present. Such a decision is repeated five times to improve decision accuracy. In the case that adjacent flag NF is one and an origin draw-in switch HL is under a faulty condition, the origin draw- in signal HS is outputted to process an error and to stop the movement of the table. On the other hand, when the origin draw-in switch HL is in a normal state, the deceleration is continued and it is decided whether or not the origin draw-in signal HS is present upon reaching a base speed, thereby carrying out an origin draw-in processing operation. Thus, a precise origin may be established at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an origin return processing method for an NC machine.

1 (In an NC machine, once the power is turned off, -
Since the position of the machine cannot be recognized, a so-called origin return process is recommended, in which the machine is returned to the reference point of a predetermined coordinate system (6'ItIL) after the power is turned on.

The origin return processing method for ψ rice is +ﾾiJ of the predetermined origin.
The machine is moved by the motor, and the machine is moved by the motor, and when the machine operates the deceleration command switch, the machine is brought to a specified speed. The monkey that was decelerated, the machine moves with the speeded up speed and the machine is pulled into the home position on the condition that the switch for pulling into the home position is activated.

However, in such conventional methods, if the home retraction switch is defective and in the ON state, the regular town Pψ1萱~Sagi processing is performed, or the point at which the deceleration is completed and the origin retraction switch is turned on. If the timing is the same as when the switch is turned on, the return-to-origin processing will be performed while the deceleration speed is not stable, and the machine will be pulled from the next point to the normal ω to f″ and 11□!-, The origin of Kasakitate was located at the FuiE location, which was the origin of Kasumai.

The purpose of the present invention is to create such a stop b'/, after the origin of the arc at NC+1, which is never established with the origin at ILv.
It is possible to use the JJ method for processing.

Therefore, in the present invention, the mechanical cedar! lll1 force direction first
and the second switch by determining the operating state of the second switch at the point in time during which the 14i is decelerated to constant speed H by the switch a* &j' %]. Whether or not the second switch is not expanded can be determined by determining the operating state of the second switch at the time when the machine is decelerated to a constant speed of Qr, and by determining the time when deceleration is completed and the operating timing of the second switch. The purpose is to achieve the above object by determining whether or not the position is a car, and stopping the -C origin return process based on the result of the determination.

An embodiment of the present invention will be explained in one section below.

Figure 1 shows the drive mechanism on the arc body side of the NC machine that implements the gravity method. In the same figure, a machine, for example, a table l, is rotated 600 times by a feed screw shaft connected to one output shaft 3 of a drive motor 2 via a gear 4.5.
It is now possible to move to the right. A limit switch l)L for deceleration command as a first switch and a limit switch HL for retracting the origin as a second switch are provided on the tip side of the front self-feed screw @6. The deceleration command limit switch DL is located before a predetermined origin, and when turned on by the movement of the table I, issues a deceleration command to decelerate the moving speed of the table I to a predetermined speed (pace speed VB). (No. g DS is output. The limit switch HLld for pulling the origin is located at a position where the table 1 has advanced a certain distance toward the origin from the position where it has been decelerated to the base speed vB and is located in front of the origin, When turned on by the movement of the table 1, a home retraction command signal H8 is output.Furthermore, a resolver 10 is connected to the output shaft 7 of the other force of the drive motor 2 via a gear 8.9. 10 outputs the rotation of the drive motor 2, that is, the amount of movement of the table 1, as a number of pulses.

For example, 2000-'' lus is output per rotation.

Figure 2 shows the circuit configuration of the NC device that drives the drive mechanism 1. The NC device includes an operation section 11,
Tape reader 12, control unit 13, ]-order full counter 14, feed counter 15 for adding and storing the number of pulses from the resolver 10; 1 mountain J counter 1;
4@15, and an amplifier 17 that amplifies the output from the booster 16 and supplies it to the drive motor 2. The operation section 11 is provided with a display in addition to each yuzu switch and keys. Further, the tape IJ-da 12 is connected to the operation section 11.
The information on the tape T is read in response to a command from the controller 13, and the information is sent to the control section 13. Furthermore, the control unit 13 performs interpolation calculation on the information given from the chip reader 12, and based on the result, the command value control unit 13
A force that distributes the movement command value to 4, 6 limit switches before turning on the power source, 6 self-limit switch I) A signal DS from L, IIL, H8 and Art H self-feedback power; grid signal GS given from counter 15. (For example, if the resolver 10 has a rotation count of 2000 A, this is given every time the foot counter 15 counts 2000! It is given once every time the Lupa 10 rotates once.) It is designed to perform origin return processing to return to the origin.

FIG. 3 shows an example in which the control section 13 is constituted by a microcomputer. The control unit 13 includes a central processing unit (referred to as CPU) 21, a lead-off memory (
22 (referred to as ROM) and random access memory (referred to as RAM) 23. Said CPU
21 inputs the signals DS from the limit switches DL and HL, the grid signal O81 from the feedback counter 15, and the information from the operating section 11 and the tape reader 12, and interpolates the information from the chip reader 12. , distributes the result to the command value counter 14, and executes the atrocity restoration process when the power is turned on. Still stored in the 1tUM 22 is a program that executes 1M point (1W return processing) in No. 11 of the programs that execute the Nll record interlude etc.

In history, the above t (AM23 has 011 tape reader 1)
In addition to the storage area for storing information from 2, a proximity flag NF, a proximity counter NC, etc. are allocated to the address b[fixed].

Next, the operation of this embodiment will be explained. Now, in the state shown in Fig. 8I41, when the w1 source is turned on, a movement command value is given to the command value counter 14 from the CPU 21 of the groan suppressing section 13 at regular intervals. Then, the difference between the movement command value of the command value counter 14 and the data of the feedback counter 15 is determined by the amplifier 16 and then applied to the drive motor 2 via the amplifier 17. As a result, the drive motor 2 is rotated, and the rotation is via the gear 4.5! As a result of being transmitted to the machine feed screw shaft 6, the table 1 is moved rightward in FIG. 1 at high speed. At this time, as shown in the flowchart shown in FIG. 4, it is determined whether the deceleration command signal D''S is received, that is, whether the deceleration command limit switch DL is on.

Now, while the table l is being moved at high speed, the limit switch D for deceleration command is activated by the table l.
When L is turned on and the deceleration command signal DS is given, the presence or absence of the home retraction command signal H8 is determined.
When the proximity flag NF is set to "@1" if it is "destruction", and the proximity flag NF' is set to "1" when it is "absent", the proximity counter NC is counted up (+1), and the value of the proximity counter NC is @ It is determined whether or not the value of the proximity counter NC has reached @5#. If the value of the proximity counter NC has not reached @5#, the above-mentioned process is continued until the value of the proximity counter NC reaches @5". It is repeated. In fact, even if the limit switch IIL for home retraction is fluctuating between on and off states when the limit switch DL for deceleration command is turned on, it is stable because it has been taken in five times. It is possible to take in the signal of the limit switch HL for pulling in the origin of the state.

- When the first cycle of the proximity counter NC reaches "5", it is then determined whether the proximity flag NF is l#.

Here, if the limit switch HL for home position retraction is defective and is in the on state, a home position retraction command signal HS is issued,
Since the proximity flag NF is l# due to the above processing,
Next, F-processing is performed. In this error processing, the distribution of the movement command value to the finger 4 candy counter 14 is stopped, thereby stopping the driving of the drive motor 2, and an error is displayed on the display of the operation unit 11. Therefore.

If the limit switch L-L for retracting the origin is defective, the origin return process will be canceled and the origin will not be established at the 11th position. You can know this. 5 Also, if the limit switch HL for retracting the origin is normal, that is, if the line is off, the proximity flag NF is "0", so
Next, the value of the movement 1b command value distributed to the command value counter 14 is gradually decreased. As a result, the table 1 is set at board speed, and its movement speed is set to the preset pace speed vB.
is decelerated until it reaches . Eventually, when the movement speed of the table l reaches the pace speed VBK, it is next determined whether the movement at the pace speed vB is within a certain distance.In this case, the movement speed at the pace speed vH is determined. is within a certain distance, then the origin retraction command signal 1
It is determined whether there is -18.

At this time, if there is a home retraction command signal H8, immediately after the table 1 is decelerated to the pace speed vB, the limit switch H for home retraction is activated by the table 1.
In a pigeon coop in which a limit switch HL for retracting the origin is provided at a position where L is turned on, the table I is stopped during the above-described error handling, and an error is displayed on the display of the operation unit 11. Therefore, if the timing at which the origin pull-in limiter 1SOCHILLL is activated is not normal, the origin return process will be canceled due to error processing, so the origin will not be established at an incorrect position, and an error will be displayed. Workers can know this.

In addition, if there is no origin retraction command signal Ha, that is, if the origin retraction limit switch (IL) is off in the judgment immediately after the table l is decelerated at the pace speed VBt, the table l is moved at the pace speed vB. go. Eventually, table 1 will reach its pace speed v
After moving a certain distance at B and reaching a stable speed, turn on the limit switch lt S for pulling back to the home position, and the home pulling 1'' FJ command (g No. 1 (S) is given. Then, the value of the feedback counter 15 at that time is The value, that is, the value of the resolver lO is taken, and the difference between the child value and the count number (2000) per revolution of the resolver 10 is given to the command value counter 14 as a movement command value. If the value of the resolver lO when the pull-in limit switch [I L is turned on is 1500, then the value is 2000.
A value of -1500=500 is given to the command value counter 14 as a movement command value. As a result, the table 1 is moved by the movement command value of the command value counter 14 and stopped at the next grid □ point. Therefore, the origin can be established accurately at the grid points.

In addition, if the limit switch HL dt for retracting the origin remains off, table 1 will change the pace speed V.
It continues to be moved as n, and an error is detected at the point where the movement reaches the maximum.

In this manner, after one origin return process is performed, Denol 1 is moved according to the information from Chi and #Ill, and the work specified in #51 is performed.

By the way, in this S) 6 example, the limit switch l for deceleration command is set in the moving direction of the table l and +All from the origin.
) L and limit switch Hl for retracting the origin.

When the table 1 is moved at high speed and the deceleration command limit switches J and 41 are turned on by the chisel l, it is determined whether the origin retraction limit switch IIL is on or not. ,, -t, the origin return process is canceled when the origin retraction limit switch HL is on, so even if the origin retraction limit switch HL remains on and is defective, the origin will be established at the incorrect position. You can prevent this from happening.゛Also, by turning on the fall speed command limit switch DL, table 1
When the moving speed of is decelerated and reaches the pace speed vB, it is determined whether or not the limit switch 11L for home position retraction is on, and if the IJ 5 switch HL for home position retraction is on, the home return process is performed. Since the limit switch HL for retracting the home position is installed in a position where the limit switch HL is turned on immediately after table 1 is decelerated to the pace speed vB, the home position will be established at the incorrect position. You can prevent this from happening. Therefore, the limit switch II for retracting the origin
After determining that L is constant and the position is correct,
Table 1 is stopped at the next grid point on the condition that limit switch HL for pulling in the origin is turned on based on Chinol l's movement at pace speed vB, so the origin is always established at the normal position. be able to. If this ti or the origin return process is canceled, an error or - is displayed on the six indicators, so that the operator can be informed that the origin return process is in error. Accordingly, the operator can replace the origin retraction limit switch HL and adjust the mounting position from the error display.

In addition, in implementation, for example, as shown in FIG. 6, a substantially half-moon-shaped cam 31 may be attached to the tip of the feed screw shaft 6, and the limit switch HL for retracting the origin may be brought into sliding contact with this cam 31. good. However, in this case, each time the feed screw shaft 6 rotates once, the IJ Mitswitch HL for pulling the origin is turned on and off as shown in Fig. 7(C), so multiple Determine whether the limit switch IIL for retracting the origin is on or off,
When all of them are in the ON state, the origin point retraction river limit switch HL is determined to be defective and the IIjj point return process is stopped.

Furthermore, the configuration of the control section 13 does not necessarily have to be a microcomputer.

As described above, according to the present invention, the defect and position of the switch for pulling the machine to the home position are determined, and if these are not normal, the home return process is canceled, so that the home position is not established at an incorrect position. It is possible to provide a method for returning to the origin of NC and machines without causing problems.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the drive mechanism of the NC machine that implements the method of the present invention, Fig. 2 is a circuit diagram of the NC device, Fig. 3 is a circuit diagram showing the configuration of the control section, Fig. 4 is a flow chart, Fifth
The figure is a time chart. FIG. 6 is an explanatory diagram of another drive mechanism of the NC machine that implements the method of the present invention, and FIG. 7 is a time chart thereof. 1...Table as a machine, DL...Switch for deceleration command as the first switch, H...Elephant switch for retracting the origin as the second switch @ Misakito Dai Misaki Patent attorney Minoru Kinoshita (1 other person) □ Figure 1 Figure 2 Figure 3 Figure 3 Figure 5 1 (D) GS 61ヱI (A) (B) Figure 7 (D) GS 10 Inji) Ill Il,
lu- (@ Yuiro) August 6, 1989 T111'l' Director-General Kazuo Chikusugi T, it I'l indication Showa 5711 Patent No. 1 No. 90373: 3'f
+ Old 1: Nasurusha Elementary School (Relationship with 'l Patent Applicant 1'::')':1'f104 1-1, 4-2-11, Ginza, Chuo-ku, Tokyo'”:'1 (?sin, )(34B
) Toshiba Machine Co., Ltd. Representative Akinobu Kuno 4 Representative Person 8 Nyama 11 Person 1 (- (1) On page 8 of the specification, lines 8-9, [hp is changed to l”,
After ........., INF changes "1" to "1".
Changed to ``he who was set to.'' (2) On page 8, line 14 of the specification, “Repeat 1.
``As a result of repeated determination, if the origin pull-in command signal H8 is received even once out of 5 determinations, the proximity flag NF is set to 1''. Changed to 11. (3) Delete ``1 Stable Mata Akinaka'' in Line 18 of No. 8 Sada of the Specification. (4) Specification No. 8jj No. 191'T [Signal capture f
r l is changed to [Incorporate On 1r issue into salary] (5
) Figure 4 in the figure has been revised as shown in the attached sheet. . that's all

Claims (1)

[Claims] (1) A first switch and a second switch in the direction of the moving force of the machine.
A switch is provided, and when the first switch is actuated by the movement of the machine, the movement of the machine Ik! In the NC machine return-to-origin processing force method, which stops the machine at DrW-pc on the condition that the second switch is activated, the first Arashi is decelerated to n1 foot speed. At any time from the time the first switch is actuated until the machine is decelerated to a predetermined speed, and at least at the time when the machine is decelerated to a predetermined speed. A method for processing the return-to-origin processing power of an NC machine, in which the operating state of the second switch is determined, and depending on the operating state, execution of the process for stopping the mechanical sound D1 at a fixed position is stopped.