Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
1993-12-01
2001-11-06
Ngo, Chuong Dinh (Department: 2121)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C700S175000, C700S178000, C700S179000, C700S180000
Reexamination Certificate
active
06314336
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a numerically controlled machining apparatus which improves arrangements for any step of a machining process and administration of machining programs, and more particularly, to a numerically controlled machining apparatus which improves arrangements for workpieces and administration of machining programs concerning an electrode and workpieces in an electric discharge machining apparatus. And the present invention also relates to a numerically controlled machining apparatus which executes position control of an electrode and a plurality of workpieces, each having respectively a different shape, in a case where machining is executed by changing the plurality of workpieces.
BACKGROUND OF THE INVENTION
FIG. 25
shows a configuration of conventional electric discharge machining apparatus, and in
FIG. 25
, reference numeral
1
denotes an electrode, numeral
2
denotes workpiece, numeral
3
denotes a workpiece fixing device, numeral
4
denotes a X-axis motor, numeral
5
denotes a Y-axis motor, numeral
6
denotes a cross table which moves freely to X-axis direction and Y-axis direction by the X-axis motor
4
and the Y-axis motor
5
. Numeral
7
denotes an ascending/descending shaft on which the electrode
1
having a specified shape is mounted and which is moved in the direction of Z-axis by a Z-axis motor
8
, numeral
9
denotes a machining power supply for execution of electric discharge machining with electric energy between the electrode
1
and the workpiece
2
, numeral
10
denotes an electrode exchange device which automatically exchanges the electrode
1
with a new one.
Reference numeral
11
denotes a NC tape/floppy disk as a medium storing a program for a machining sequence, data on an electrode such as an electrode reduction allowance, an electrode core gap, an electrode shape and the like, and data concerning workpieces such as a machining position and a machining depth, said data being used to decide how and what point of a workpiece to be machined are stored. Numeral
12
denotes a keyboard for complying a program and specifying the data concerning the electrode and workpieces.
Reference numeral
14
denotes a program outside inputting means for inputting data into a program from outside which displays a mistake in a program. This applies in case where if the program with machining sequence commands stored in an NC tape/floppy disk
11
has a mistake, and transfers the program to a memory
15
. It also applies in a case where there is no mistake. Numeral
16
denotes a program compiling means which checks whether an input through the keyboard
12
has a mistake or not, transfers the information entered from the keyboard
12
to the program memory
15
, in case where, there is no mistake in the entered information.
Reference numeral
17
denotes an electrode data outside inputting means for entering electrode data from outside which displays a mistake in the electrode data, in case where if the electrode data such as the electrode reduction allowance, the electrode core gap amount, the electrode shape and the like stored in the NC tape/floppy disk
11
has any mistake. It transfers the electrode data to an electrode data memory
18
, in case where there is no mistake. Numeral
19
denotes an electrode data compiling means which checks whether an input through the keyboard
12
has a mistake or not, transfers the information entered from the keyboard
12
to the electrode data memory
18
, in case where there is no mistake in the entered information.
Reference numeral
20
denotes a workpiece data outside inputting means for entering workpiece data from outside which displays a mistake in the workpiece data, in a case where if the workpiece data such as the machining position and the machining depth and the like of the workpiece
2
stored in and inputted from the NC tape/floppy disk
11
has any mistake, and transfers the workpiece data to an workpiece data memory
21
, in case where, there is no mistake. Numeral
22
denotes a workpiece data complying means which checks whether an input from the keyboard
12
has a mistake or not, and transfers the information entered from the keyboard
12
to the workpiece data memory
21
, in case where there is no mistake in the entered information.
Reference numeral
23
denotes an operation command analyzing means which executes an analysis of command data issued from the program memory
15
, the electrode data memory
18
, and the workpiece data memory
21
according to the machining program. Numeral
24
denotes an axis move control means which outputs data concerning the shaft generated by the operation command analyzing means
23
to each of the X-axis motor
4
, Y-axis motor
5
and Z-axis motor
8
and drives the XY cross table
6
and the ascending/descending shaft
7
. Numeral
25
denotes an electrode exchange device controlling means which transfers an electrode exchange command analyzed by the operation command analyzing means
23
to the electrode exchange device
10
.
Reference numeral
26
denotes a program start key which gives an instruction for start of a program to the operation command analyzing means
23
, numeral
27
denotes a NC control apparatus including the program outside inputting means
14
, the program memory
15
, the program compiling means
16
, the electrode data outside inputting means
17
, the electrode data memory
18
, the electrode data compiling means
19
, the workpiece data outside inputting means
20
, the workpiece data memory
21
, the workpiece data complying means
22
, the operation command analyzing means
23
, the axis move control means
24
, and the electrode exchange device controlling means
25
.
FIG. 26
, FIG.
27
and
FIG. 28
relate to an embodiment for the administration of a conventional machining program. Reference numeral
11
denotes the NC tape/floppy disk as a medium for storing a machining program, numeral
27
denotes the NC control apparatus, numeral
31
denotes a program manual in which machining contents of the machining program such as a number of workpieces, a number of electrodes and the like are written on paper, and numeral
32
denotes a program memory list displayed on a CRT of the NC control apparatus
27
and showing contents of the program memory
15
. As above, in conventional electric discharge machining apparatus, a program is memorized in a floppy disk and the like as a medium for data entry, and all contents of the program is administered according to the program manual
31
in which all administrative instructions are written on a paper.
FIGS. 29A and 29B
, FIG.
30
and
FIG. 31
show a case of conventional machining where two workpieces each having two holes are machined with two electrodes. Reference numeral
41
denotes a workpiece W
1
, numeral
42
denotes a workpiece W
2
, numeral
43
denotes a rough electrode T
11
, numeral
44
denotes a finish electrode T
12
, P
1
and P
2
denote machining positions respectively. Reference numeral
45
denotes an embodiment of a machining program on the CRT display.
Next, the machining program
45
will be described referring to FIG.
30
and FIG.
31
. Steps S
1
to S
30
show a rough machining step by the rough machining electrode T
11
(
43
).
Step S
2
shows to exchange an electrode to the rough electrode T
11
(
43
). Step S
3
indicates that the workpiece
41
set according to the workpiece coordinates W
1
is machined at the machining position P
1
in Step S
3
to Step S
10
. Step S
4
indicates that a workpiece is set according to the workpiece coordinates W
1
. Step S
5
indicates that the subsequent commands for movement are issued with absolute values. Step S
6
indicates movement to the machining position P
1
. A dielectric and a machining are set to ON in step S
7
. Step S
3
indicates machining by 10 mm in the direction of Z-axis. After the machining, the dielectric and the machining are set to OFF in step S
9
. The electrode T
11
(
43
) returns to a machining start position when contact is ignored in step S
10
.
Step S
Sugiyama Kazuhisa
Tsukamoto Atsuko
Mitsubishi Denki & Kabushiki Kaisha
Ngo Chuong Dinh
Sughrue Mion Zinn Macpeak & Seas, PLLC
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