Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2000-11-27
2003-01-28
Evans, Geoffrey S. (Department: 1725)
Electric heating
Metal heating
Cutting or disintegrating
Reexamination Certificate
active
06512193
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a mechanism to jet the processing liquid of a wire electric discharge machine, and to stably supply the higher flow velocity processing liquid to a gap between the work piece and a wire electrode.
Referring to
FIG. 6
, FIG.
7
(
a
) and FIG.
7
(
b
), the conventional wire electric discharge machine will be described. In
FIG. 6
, FIG.
7
(
a
) and FIG.
7
(
b
), the wire electric discharge machine is composed of: a bed
1
which is a base; a table
5
to fix a workpiece
3
processed by a wire electrode
2
; a processing tank
7
to pool the processing liquid; an X axis drive section
13
to move the table
5
in the X axis direction, by moving an X axis table
9
by the drive of an X axis motor
8
; a Y axis drive section
17
to move the table
5
in the Y axis direction, by moving a column
19
along the longitudinal direction of a lower arm
20
fixed on the base
1
by the drive of a Y axis motor
15
; a Z axis drive section
21
fixed on the column
19
to move the table
5
in the Z axis direction; an upper wire guide
25
which is fixed on the tip portion of the Z axis drive section
21
and guides the wire electrode
2
; a lower wire guide
30
fixed on the lower arm
20
through an insulation plate
26
, on the vertical surface of the tip portion of the lower arm
20
; a feeding section
60
which is housed in the lower wire guide
30
and feeds the electric energy to the wire electrode
2
; and a supply and collection section to supply the wire electrode
2
and to collect it.
The lower wire guide
30
flows the processing liquid to the work piece
3
while guiding the wire electrode
2
, and the lower end portion of the guide main body portion
33
having a collar is engaged with and fixed onto a guide attaching plate
31
having a passage to supply the processing liquid to the work piece
3
and a guide hole through which the wire electrode
2
passes. A hollow cylinder portion to guide the wire electrode
2
is provided on the guide main body portion
33
, and a central hole of a disk-like straightening plate
35
having a plurality of holes to flow the processing liquid is engaged with and fixed to the cylinder portion, thereby, a pool
36
is formed between the outlet of the passage of the guide attaching plate
31
and the holes
35
a
of the straightening plate
35
.
An upper auxiliary guide
38
to guide the wire electrode
2
is fixed to the inside of the upper portion of the guide main body portion
33
, and a lower auxiliary guide
39
is also fixed to the inside of an auxiliary plate
37
fixed to a lower portion of the guide attaching plate
31
. Incidentally, the guide attaching plate
31
and the auxiliary plate
39
are fixed onto a lower block
41
.
A nozzle
40
to jet the processing liquid is structured such that: the inner peripheral surface is fixed onto the outer peripheral surface of the straightening plate
35
, the bottom surface is fixed onto a top panel of the guide attaching plate
31
, and the top panel of the collar is fixed by a pressure plate
43
through a spring
45
, thereby, the spring
45
is compressed by the pressure of the processing liquid and the tip is elevated, and by stop of the supply of the processing liquid, the tip is returned in order to prevent the contact with the work piece
3
. Incidentally, a pipe
50
is connected to an inlet of the guide attaching plate
31
. Further, because the basic structure of the upper wire guide
25
is the same as the lower wire guide
30
, the explanation will be omitted.
The feeding section
60
is composed of a feeding dies
62
to feed the electric energy to the wire electrode
2
, and a dies pressing plate
64
to fix this feeding dies
62
, and is electrically connected to the feeding dies
62
through the guide attaching plate
31
formed of the conductive material by a wire
70
from a power source, not shown.
The supply and collect portion of the wire electrode
2
is structured in such a manner that the wire electrode
2
passes through a pipe
89
through rollers
83
,
85
and
87
which convert the direction of the wire electrode
2
wound around a wire bobbin
80
, and is accommodated in a collection box
90
.
The operation of the wire electric discharge machine structured as described above, will be described below referring to FIG.
6
and FIG.
7
. Initially, the feeding energy is electrically fed via the wire
70
to the wire electrode
2
through the feeding dies
62
, and while the discharge between the work piece
3
and the wire electrode
2
is being generated, and the table
5
is being moved to the X, Y, or Z axis, by operating the X axis drive section
23
, Y axis drive section
17
, and Z axis drive section
21
, the work piece
3
is processed to the desired shape.
On the one hand, during processing of the work piece
3
, the processing liquid passes through the passage from the pipe
50
to the guide attaching plate
31
, passes through the hole
35
a
of the straightening plate
35
to stabilize the directionality of jetting, and lightens the curvature of the fluid on the basis of the generation of the eddy flow caused through the pool
36
or the like, and jets from the jetting hole
40
a
of the nozzle
40
. Such the jetted high speed processing liquid is supplied to the gap (hereinafter, called electrode gap) between the work piece
3
and the nozzle
40
, and the processing sludge is delivered and removed, and the processing is continued while continuing the discharge by keeping the normal electrode gap and resistance value constant.
However, the processing liquid of the wire electric discharge machine structured as described above, passes through the passage of the guide attachment
31
from the pipe
50
, and after it is temporarily stays in the pool
36
and the pressure is increased, and it passes by being converted into the velocity energy by the hole
35
a
of the straightening plate
35
, and stays in the space portion formed by the inner surface of the nozzle
40
and the straightening plate
35
, and after it becomes the pressure energy, the high speed fluid is jetted from the jetting hole
40
a
of the nozzle
40
into the electrode gap as the velocity energy.
That is, because a form of the energy of the processing liquid is converted as many as 4 times in both of the velocity and pressure, the processing liquid gradually losses the holding energy at the inlet of the guide attaching plate
31
, and the velocity energy jetted from the jetting hole
40
a
of the nozzle
40
is lowered. Accordingly, when the electrode interval becomes large, because the pressure of the processing liquid is decreased, and the disturbance in the jetting direction is largely changed, there is a problem that the processing becomes unstable.
Further, the straightening plate
35
decreases the curvature or deflection of the fluid due to the generation of the eddy flow of the processing liquid inside the pool
36
, and it stably jets the processing solution so that the directionality of the processing liquid jetted from the jetting hole
40
a
of the nozzle
40
is directed upward rightly, however, there is a problem that it generates the large pressure loss.
SUMMARY OF THE INVENTION
The present invention is attained to solve the above problem, and to provide a wire electric discharge machine in which the pressure loss is small in the case of jetting the processing liquid from the nozzle.
In order to attain the object, in a wire electric discharge machine of the first aspect, a wire electric discharge machine in which a work piece is processed, while the processing liquid exists between the wire electrode and the work piece, and the discharge is being generated, the wire electric discharge machine is characterized in that a jetting nozzle to jet the processing liquid toward the work piece, and the wire guide portion which flows the processing liquid to the jetting nozzle, and guides the wire electrode into the bored hole, are provided, wherein the wire guide portion has a first passage to
Moro Toshio
Satou Seiji
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