Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
2002-08-05
2003-12-30
Picard, Leo (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C318S625000, C318S568200
Reexamination Certificate
active
06671573
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a numerical control system and, more particularly, a shaft control method in the numerical control system applied in the case that each movable shaft is moved by a plurality of motion modules.
BACKGROUND ART
The numerical control system executes the numerical control process based on the machining program and applies the machining to the work in pursuance of the command by driving the machine tool according to result of the process.
FIG. 9
is a block diagram showing a hardware of the numerical control system in the prior art. In
FIG. 9
,
10
is the numerical control system. The microprocessor (CPU)
12
is the control center of the overall numerical control system
10
, and reads the system program stored in the ROM
13
via the bus line
11
, and executes the control of the numerical control system
10
according to this system program. The temporary computation data, the display data, etc. are stored in the RAM
14
. The machining program, the tool data, various parameters, etc. are stored in the CMOS
15
. The CMOS
15
is always backed up by the battery (not shown), and thus the stored data are held as they are when the power supply of the numerical control system
10
is turned OFF.
The interface
16
is the interface for the external apparatus, and the external apparatus
17
such as the floppy disk drive (FD), the personal computer (PC), or the like is connected to the interface
16
. The external apparatus
17
such as the floppy disk drive (FD), the personal computer (PC), or the like can input/output the machining program, the tool data, various parameters, etc. into/from the numerical control system
10
.
The graphic control circuit (CRTC)
18
converts the digital data such as present positions of respective shafts, the alarm, the machining program, various parameters, image data, etc. into the image signals and then outputs them. This image signals are supplied to the CRT
19
on the operation board
22
on the numerical control system
10
, and then displayed on the CRT
19
. The keyboard control portion
20
receives the data from the keyboard
21
on the operation board
22
and then transmits the data to the microprocessor
12
.
The shaft control circuit
23
receives the moving commands of respective shafts from the microprocessor
12
, and then outputs such moving commands of respective shafts to the servo amplifier
25
. The servo amplifier
25
receives these moving commands, and then drives the servo motors
34
of respective shafts installed onto the machine tool
30
. The pulse coder (not shown) to sense the position is built in the servo motor
34
, and the position signal is fed back from this pulse coder as the pulse train. The velocity signal can also be generated by F/V (frequency/velocity)—converting this pulse train. In
FIG. 9
, the feedback lines of these position signals and the velocity feedback lines are omitted. The servo motors
34
are provided to the X-axis, the Y-axis, the Z-axis, and the C-axis respectively.
The spindle control circuit
26
receives the commands such as the spindle rotation command, the spindle orientation command, etc. and then outputs the spindle velocity signal to the spindle amplifier
27
. The spindle amplifier
27
receives this spindle velocity signal and then causes the spindle motor
33
to rotate at the instructed rotation speed. Also, the spindle amplifier
27
positions the spindle at a predetermined position in response to the orientation command.
The programmable machine controller (PMC)
28
is built in the numerical control system
10
, and controls the machine based on the sequence program that is constructed in the ladder format. In other words, the programmable machine controller (PMC)
28
converts the M command, the S command, and the T command, which are instructed by the machining program, into the signals required for the sequence program on the machine side, and then outputs the signals from the I/O unit
29
to the side of the machine tool
30
. These output signals operate various devices on the machine side. Also, the programmable machine controller (PMC)
28
receives the signals from the limit switch on the side of the machine tool
30
, the switches on the machine operation panel, etc., and then transmits the signals which are subjected to the necessary process to the microprocessor
12
.
In recent years, the small and high-performance product that employs the linear motor, or the like as the motion module can be supplied. Also, the numerical control system can attain the extremely high speed in the process with the higher performance of the microprocessor
12
, and thus can simultaneously control the good many shafts. For example, as shown in
FIG. 10
, the machine having the configuration in which respective movable shafts (Z axis, C axis) are moved by a plurality of motion modules has been invented. In the case of
FIG. 10
, the configuration in which respective movable shafts in the Z axis and the C axis are moved by a plurality of motion modules is employed.
FIGS. 11A
to
11
C shows the example of the configuration in which the linear movable shaft is moved by a plurality of motion modules.
FIG. 11A
is the example of the configuration in which a plurality of motion modules
31
are arranged with respect to one movable shaft in series with the moving direction of the movable shaft. Since respective motion modules
31
can apply the force to the movable shaft
32
in the directions indicated by the arrow, the movable shaft
32
can be moved in the directions indicated by the arrow.
FIG. 11C
is the example of the configuration of the multipolar linear DC motor. This linear DC motor has the configuration that the armature (mover)
44
, which corresponds to the primary side of the linear motor, is moved on the field (stator)
45
, in which the N-pole and the S-pole of the magnet that correspond to the secondary side of the linear motor are alternatively arranged.
FIG. 11B
is the example of the configuration in which the linear movable shaft constructed by the linear motor shown in
FIG. 11C
is moved by a plurality of motion modules. In other words, a plurality of armatures (movers)
44
that correspond to the primary side of the linear motor are fixed to the linear movable shaft
32
, and the field (stator)
45
that corresponds to the secondary side of the linear motor is provided below the armatures (movers)
44
. The linear movable shaft
32
can be moved by the thrust, that a plurality of armatures (movers)
44
receive from the field (stator)
45
, in the direction indicated by the arrow.
Also,
FIG. 12A
is the example of the configuration in which a plurality of motion modules
31
are arranged with respect to one movable shaft in parallel with the moving direction of the movable shaft. In this case, like
FIG. 11A
, since respective motion modules
31
apply the force to the movable shaft
32
in the direction indicated by the arrow, the movable shaft
32
can be moved in the direction indicated by the arrow.
FIG. 12B
is the example of the configuration in which the linear movable shaft constructed by the linear motor shown in
FIG. 11C
is moved by a plurality of motion modules. In other words, a plurality of armatures (movers)
44
that correspond to the primary side of the linear motor are fixed to the linear movable shaft
32
, and in this case the fields (stators)
45
that correspond to the secondary side of the linear motor are provided below the armatures (movers)
44
to correspond to the armatures (movers)
44
respectively. The linear movable shaft
32
can be moved by the thrust, that a plurality of armatures (movers)
44
receive from the corresponding field (stator)
45
respectively, in the direction indicated by the arrow.
FIG. 13
is the example of the configuration in which the rotational movable shaft is moved by a plurality of motion modules. A plurality of motion modules
31
are arranged with respect to one rotational movable shaft in the circular direction of the movable shaft. The movable shaft
32
Nigazawa Hiromichi
Niwa Tomomitsu
Cabrera Zoila
Mitsubishi Denki & Kabushiki Kaisha
Picard Leo
Sughrue & Mion, PLLC
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