Numerically controlled lathe and method of cutting workpiece...

Details Numerically controlled lathe and method of cutting workpiece... Numerically controlled lathe and method of cutting workpiece...

2003-03-11

2004-06-01

Fridie, Jr., Willmon (Department: 3722)

Turning

Process of turning

C082S047000, C082S118000, C082S129000

Reexamination Certificate

active

06742422

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a numerically controlled lathe which has two opposed head stocks, main shafts respectively supported by the two head stocks, and two tool rests each having attached thereto a tool used to machine a workpiece grasped by each of the main shafts, and can simultaneously machine two workpieces grasped by the respective main shafts on the two head stocks, and to a method of cutting a workpiece on this numerically controlled latch.
BACKGROUND ART
A numerically controlled lathe (which will be referred to as an NC lathe hereinafter) which has two opposed head stocks and tool rests and can simultaneously machine two workpieces grasped by main shafts of the two head stocks by using a tool attached to each of the tool rests is known from, for example, Japanese Patent Application Laid-open No. 501758/1998 and others.
FIG. 13
is a plane view illustrating a schematic structure of the NC lathe disclosed in Japanese Patent Application Laid-open No. 501758/1998.
A first head stock
220
and a second head stock
230
are oppositely arranged on a bed
210
of an NC lathe
200
. The first head stock
220
and the second head stock
230
respectively rotatably support main shafts
221
and
231
parallel to a Z axis of the NC lathe
200
. These main shafts
221
and
231
are arranged so as to be eccentric in the direction of an X axis. A non-illustrated chuck is provided at an end of each of the main shafts
221
and
231
, and the chucks grasp workpieces W
1
and W
2
.
The first head stock
220
is fixed to the bed
210
. A guide rail
240
extending in the direction of a Z
1
axial line parallel to the Z axis of the NC lathe
200
is provided to the bed
210
. A saddle
250
is mounted on the guide rail
240
, and the saddle
250
moves forward and backward in the direction of the Z
1
axis while being guided by the guide rail
240
by drive of a non-illustrated drive mechanism including a servo motor and others.
A guide rail
270
is provided on the saddle
250
in the direction parallel to the X axis. A carriage
255
which reciprocates along the guide rail
270
is mounted on the guide rail
270
. This carriage
255
moves in the direction of an X
1
axis parallel to the X axis by drive of the non-illustrated drive mechanism including a servo motor and others. A first tool rest
260
and the second head stock
230
are mounted on the carriage
255
and move together with the carriage
255
in the direction of the X
1
axis.
The first tool rest
260
includes a turret face plate
261
capable of sectional rotation on one side thereof. To this turret face plate
261
are attached a plurality of tools T
1
used to machine the workpiece W
1
grasped by the main shaft
221
of the first head stock
220
. Further, the tool T
1
is positioned with respect to the workpiece W
1
and machines the workpiece W
1
while moving the direction of the Z
1
axis by a combination of movement of the saddle
250
in the direction of the Z
1
axis and movement of the first tool rest
260
in the direction of the X
1
axis.
A second tool rest
280
is provided so as to be opposed to the main shaft
231
of the second head rest
230
. A turret face plate
280
capable of sectional rotation is provided to the second tool rest
280
on one side thereof. To the turret face plate
281
are attached a plurality of tools T
2
used to machine the workpiece W
2
grasped by the main shaft
231
of the second head stock
230
. The second tool rest
280
can freely move on the bed
210
in the direction of the X
2
axis along a guide rail
282
provided in the direction of an X
2
axis parallel to the X axis of the NC lathe
200
.
According to such an NC lathe
200
, since the first tool rest
260
and the second head stock
230
are provided on the common saddle
250
and the carriage
255
, movement of the tool T
1
in the direction of the Z
1
axis relative to the workpiece W
1
becomes movement of the tool T
2
relative to the workpiece W
2
, and the same drilling or the like can be carried out with respect to the two workpieces W
1
and W
2
at the same time.
Furthermore, different kinds of machining can be performed to the workpieces W
1
and W
2
at the same time by adding a movement speed inherent to the direction of X
2
axis to the tool T
2
while moving the tool T
2
such as a cutting tool in the direction of the X
2
axis in synchronization of movement of the tool T
1
in the direction of the X
1
axis.
The above-described NC lathe
200
can perform the same kind or different kinds of machining to a plurality of workpieces W
1
and W
2
at the same time, but there are the following disadvantages.
That is, since movement speeds of the tool T
1
and the tool T
2
in the direction of the Z
1
axis are determined by movement of the saddle
250
in the direction of the Z
1
axis, types of machining to the workpieces W
1
and W
2
which can be performed at the same time are restricted.
It is an object of the present invention to provide an NC lathe which can perform various kinds of machining to a workpiece on the first main shaft side and a workpiece on the second main shaft side at the same time, and a method of cutting a workpiece on this NC lathe.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a numerically controlled lathe having: a first head stock and a second head stock arranged so as to be opposed to each other; a first main shaft supported by the first head stock and a second main shaft supported by the second head stock; a tool rest including tools used to machine workpieces grasped by the first main shaft and the second main shaft; and a numerical control device which controls rotation of the first main shaft, rotation of the second main shaft and relative movement of the tool rest with respect to the first head stock or the second head stock, wherein the numerically controlled lathe comprises: a first tool rest to which one or both of a first tool used to machine the workpiece grasped by the first main shaft and a second tool used to machine the workpiece grasped by the second main shaft can be attached and can freely move in a direction of a Z
1
axis parallel to a main shaft axial line of the first main shaft and a direction of an X
1
axis orthogonal to the Z
1
axis; a second head stock which can freely move in a direction of an X
3
axis parallel to the X
1
axis of the first tool rest and a direction of a Z
3
axis parallel to the Z
1
axis; and a second tool rest to which one or both of a third tool used to machine the workpiece grasped by the first main shaft and a fourth tool used to machine the workpiece grasped by the second main shaft can be attached and can freely move in a direction of a Z
2
axis parallel to the main shaft axial line of the first main shaft and a direction of an X
2
axis orthogonal to the Z
2
axis.
In this numerically controlled lathe, there is provided a control device which includes a first control system which controls movement of the first tool rest in the direction of the X
1
axis and movement of the same in the direction of the Z
1
axis, a second control system which controls movement of the second head stock in the direction of the X
3
axis and movement of the same in the direction of the Z
3
axis and a third control system which controls movement of the second tool rest in the direction of the X
2
axis and movement of the same in the direction of the Z
2
axis, and it is good enough that the first control system, the second control system and the third control system perform superposition control of movement of a pair of the X
1
axis and the X
3
axis, superposition control of movement of a pair of the X
3
axis and the X
2
axis, superposition control of movement of a pair of the Z
1
axis and the Z
3
axis, and superposition control of movement of a pair of the Z
3
axis and the Z
2
axis in accordance with combinations of three tools from the tools T
1
to T
4
used to machine the workpiece W
1
and the workpiece W
2
.
According to the present invention, there is provided a

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