JPH06312341A - Numeral control device - Google Patents

Abstract

PURPOSE:To improve operability concerning the control of a feed rate by providing a highest speed clamp means capable of changing the feed rates of all machinery by one operation in a device having a function capable of manually changing various feed rates of numeral control machinery respectively. CONSTITUTION:This numeral control device is provided with a pretreating means 1 outputting movement data from a work program and a feed rate command. A feed rate command from the pre-treatment means 1, a rapid traverse, a feed rate, and outputs of respective override dials for manual running/dry run also a signal from a highest speed clamp means 3 are inputted in a speed control means 2, and here a signal representing override quantity or the highest speed to be clamped is outputted. Interpolation treatment is applied by an interpolation means 4 according to movement data from the pre-treatment means 1 and a signal from a speed control means 2, and a treatment result is fed to a spindle control means 5 to drive-control the servo motors 6a-6c of respective spindles based on a movement command concerning the respective spindles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device, and more particularly to a numerical control device having improved operability in controlling the feed rate of a machine.

[0002]

2. Description of the Related Art Normally, at the start of machining of a machine controlled by a numerical control device (CNC), when a program is first executed after a setup such as manual positioning, whether the setup is correct or not. For confirmation, the operation method is that the machine is operated slowly first, and when the confirmation is obtained, the amount of override is increased and the machine is operated at the speed as instructed. As a means to change the programmed value, the machine operation panel is usually for fast-forward, for feed speed and for manual operation (also for dry run).
There are three override dials. At the start of machining, the machine operator operates these dials to slowly move or stop the machine, while checking the positional relationship between the tool and the workpiece to confirm that correct machining is being performed. After that, the amount of override is increased to the feed speed specified by the program.

[0003]

However, when attempting to perform trial cutting at the start of machining with the override dial, the operator may use three override dials properly or may use the override dials for fast feed and cutting feed speed. Both had to be operated, and the operation was complicated.

Therefore, some machines use both the rapid feed and the feed speed override dial, but in this case, since the cutting feed speed and the rapid feed speed are different, the speed is changed from the cutting to the rapid feed even when the position of the same dial is set. May change suddenly, which may cause an operation error.

The present invention has been made in view of the above circumstances, and provides a numerical control apparatus capable of collectively controlling all movement speeds by three override dials, which are properly used in some cases. The purpose is to

[0006]

In order to solve the above-mentioned problems, the present invention provides a numerical control device having a function capable of manually changing various feed rates of a numerical control machine,
There is provided a numerical controller characterized by being provided with a maximum speed clamping means capable of changing the feed speed of all machines by one operating means.

[0007]

According to the above-mentioned means, the maximum speed clamping means sets the maximum speed at which the machine can move by operating one operating means, and the numerical controller sets the moving speed of all machines such as fast-forwarding and cutting. , Clamp to its set maximum speed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a numerical controller for carrying out the present invention. In the figure, 1 is a pre-processing means, which outputs movement data and a feed rate command from a machining program. 2 is a speed control means, which is a feed speed command from the preprocessing means 1, a fast-forward override dial,
Feed speed override dial, manual operation / dry run override dial, and maximum speed clamp means 3
And outputs a signal indicating the amount of override or the maximum speed to be clamped. The interpolation means 4 receives the movement data from the pre-processing means 1 and the signal from the speed control means 2 and performs interpolation processing, and supplies the result to the axis control means 5. The axis control means 5 receives the movement command for each axis and drives the servo motors 6a to 6c for each axis.

The maximum speed clamp means 3 has one operating means, and by operating it, a signal representing the maximum speed at which the machine can move is output. This signal is a signal similar to the override signal, and is a 1-byte binary signal representing an override value of 0 to 255%, for example. The speed control means 2 receives the signal, is input to the interpolation means 4, and clamps the speed that the servo motor can send via the axis control means 5 to the maximum speed set by the maximum speed clamp means 3 at the feed speed.

FIG. 2 is a block diagram of hardware showing a detailed configuration of a numerical controller (CNC) for implementing the present invention. In the figure, 10 is a numerical controller. The processor 11 is a central processor for controlling the entire numerical control device 10, and a ROM is provided via a bus 21.
The system program stored in 12 is read, and the entire numerical controller 10 is controlled according to this system program. RAM 13 has temporary calculation data,
Display data etc. are stored. DRAM for RAM13
Is used. The non-volatile memory 14 using a CMOS or the like stores data such as a tool correction amount, a pitch error correction amount, a machining program and parameters to be retained even after the power is turned off.

The interface 15 is an interface for an external device, and is connected to an external device 31 such as a paper tape reader, a paper tape puncher, and a paper tape reader / puncher. The processing program is read from the paper tape reader, and the processing program edited in the numerical controller 10 can be output to the paper tape puncher.

A programmable machine controller (PMC) 16 is built in the numerical controller 10 and controls the machine with a sequence program created in a ladder format. That is, according to the M function (auxiliary function), S function (spindle function) and T function (tool function) instructed by the machining program, these are converted into necessary signals on the machine side by the sequence program, and the I / O unit Output from 17 to the machine side. This output signal drives a magnet or the like on the machine side to operate a hydraulic valve, a pneumatic valve, an electric actuator, or the like. Further, various contact signals from the limit switch on the machine side and a rapid feed override dial 34 provided on the machine operation panel 33, a feed speed override dial 35, a manual operation / dry run override dial 36, and a maximum speed as a maximum speed clamping means. A signal from the clamp dial 37 is received, necessary processing is performed, and the signal is passed to the processor 11. The maximum speed clamp dial 37 may be a rotary switch having a multi-contact structure that can give signals representing various override amounts.

The graphic control circuit 18 converts digital data such as the current position of each axis, alarms, parameters and image data into an image signal and outputs it. This image signal is CRT / MDI (manual data input)
It is sent to the display device 26 of the unit 25 and displayed on the display device 26. The interface 19 receives the data input from the keyboard 27 in the CRT / MDI unit 25 and transfers it to the processor 11.

The interface 20 is a manual pulse generator 3
2 and receives the pulse from the manual pulse generator 32. The manual pulse generator 32 is used to precisely position the working part of the machine by manually rotating its handle.

The axis control circuits 41 to 44 receive the movement command of each axis from the processor 11 and output the command of each axis to the servo amplifiers 51 to 54. The servo amplifiers 51 to 54 receive the movement command and drive the servo motors 61 to 64 of the respective axes. The servo motors 61 to 64 have a built-in pulse coder for position detection, and the position signal is fed back from this pulse coder as a pulse train. In some cases, a linear scale is used as the position detector. Further, a speed signal can be generated by frequency / speed (F / V) conversion of this pulse train.
In the figure, the feedback line and velocity feedback of these position signals are omitted.

The spindle control circuit 71 receives a spindle rotation command and a spindle orientation command, and outputs a spindle speed signal to a spindle amplifier 72. The spindle amplifier 72 receives the spindle speed signal and rotates the spindle motor 73 at the commanded rotation speed. In addition, the spindle is positioned at a predetermined position according to the orientation command.

A position coder 82 is connected to the spindle motor 73 by a gear or a belt. Therefore, the position coder 82 rotates in synchronization with the spindle 73, outputs a feedback pulse, and the feedback pulse is read by the processor 11 via the interface 81. This feedback pulse is used to move the other shaft in synchronization with the spindle motor 73 and perform machining such as thread cutting.

FIG. 3 shows an example in which the manual pulse generator 32 is used instead of the maximum speed clamp dial 37 of FIG. 2 as the maximum speed clamp means. FIG. 3A shows a method of adjusting the maximum speed to be clamped according to the rotating direction of the manual pulse generator 32. The manual pulse generator 32 outputs a two-phase pulse signal whose polarity changes depending on its rotation direction, and this pulse signal is input to the register 2 a of the speed control means 2. The register 2a integrates the number of pulses of the two-phase pulse signal from the manual pulse generator 32, and adds or subtracts according to the polarity. For example, by rotating the manual pulse generator 32 to the right, the register 2a
Value is added to increase the maximum speed, and when rotating to the left, the value in register 2a is subtracted and the maximum speed is decreased.

FIG. 3B shows a method of adjusting the maximum speed to be clamped by the rotation speed of the manual pulse generator 32. The manual pulse generator 32 outputs a number of pulses corresponding to the rotation speed and is input to the register 2b of the speed control device 2. The register 2b is cleared every fixed time, and the number of pulses input within the fixed time is output as the maximum speed.

The manual pulse generator 32 is preferably of the pendant type which can be removed from the machine control panel for use. This enables operations that could only be done within reach of the override dial while observing the positional relationship between the tool and the workpiece, and when the operator moves to a position that is easy for the operator to see, it is necessary to operate again to operate the override. This eliminates the need to move and improves the operability of the feed rate control for the operator.

FIG. 4 is a flow chart showing the procedure for determining the feed rate of the numerical controller according to the present invention. The feed rate is calculated by first determining the feed rate from the override signal and the command rate in the case of fast-forward override, based on the conditions based on the cutting or fast-feed command in step 90 and the dry run conditions in steps 91 and 92. Is calculated (step 9
3) Calculate the dry run speed in the case of fast feed dry run (step 94), calculate the feed speed from the override signal and command speed in the case of cutting feed speed override (step 95), and in the case of cutting feed dry run By the method of calculating the dry run speed (step 96),
As usual.

The maximum speed clamping by the maximum speed clamping means is applied after this feed rate calculation. That is, in step 97, the numerical controller calculates the maximum speed based on the signal from the operation panel or the signal from the manual pulse generator, and in step 98, the feed speed calculated by the usual method is the maximum speed. If it exceeds, clamp the feed rate to its maximum speed.

[0023]

As described above, according to the present invention, by providing the maximum speed clamping means, the tool can be moved while confirming the positions of the tool and the work at the start of machining,
Instead of using 3 override dials, which had to be used properly when stopping, 1
The operation is simplified because it can be operated with one dial.

When the manual pulse generator is used as the maximum speed clamping means, the clamp function can be implemented without increasing the number of dials. Especially, when the pendant type manual pulse generator is used. In addition, since the operator can move freely and check the position of the tool and the work from an arbitrary angle, the operability is dramatically improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a numerical control device for carrying out the present invention.

FIG. 2 is a hardware block diagram showing a detailed configuration of a numerical control device for carrying out the present invention.

FIG. 3 is an explanatory view showing another embodiment of the maximum speed clamping means.

FIG. 4 is a flowchart showing a procedure for determining a feed rate of the numerical controller according to the present invention.

[Explanation of symbols]

 1 Pre-Processing Means 2 Speed Control Means 3 Maximum Speed Clamping Means 4 Interpolating Means 5 Axis Control Means 10 Numerical Control Devices 32 Manual Pulse Generators 33 Machine Control Panels 34 Fast Forward Override Dials 35 Feed Speed Override Dials 36 Manual Run / Dry Run Override Dials 37 Dial for maximum speed clamp

Claims (5)

[Claims] 1. A numerical controller having a function capable of manually varying various feed rates of a numerically controlled machine, wherein a maximum speed clamp means capable of varying the feed rate of all machines by one operating means is provided. Characteristic numerical control device. 2. The numerical controller according to claim 1, wherein the maximum speed clamp means is a rotary switch that outputs a signal of a feed speed according to a rotation angle. 3. The numerical value according to claim 1, wherein the maximum speed clamp means is composed of a manual pulse generator and a register for adding / subtracting the number of pulses according to the rotating direction of the manual pulse generator. Control device. 4. The maximum speed clamp means is composed of a manual pulse generator that generates a number of pulses according to the rotation speed, and a register that counts the number of pulses within a fixed time from the manual pulse generator. The numerical controller according to claim 1, characterized in that. 5. The numerical controller according to claim 3, wherein the manual pulse generator is of a pendant type which can be detached and operated.