JPH0242602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is an opposed spindle lathe having two spindles facing each other, in which a workpiece can be moved between the spindles to change the phase on the main axis in a short time. The present invention relates to a method for controlling the transfer of workpieces in a counter-spindle lathe, which allows the transfer of workpieces without causing misalignment.

(b) Prior Art Recently, various types of turret arrangements have been proposed for opposed spindle lathes having two spindles facing each other.

In addition, normally, in order to process a workpiece in an opposed spindle lathe having two spindles facing each other, the workpiece is attached to one of the spindles via a chuck, and the first process is performed. After the process is completed, the workpiece is transferred to a chuck attached to the other spindle using a handling robot or the like, and after the transfer is completed, the second process is performed on the workpiece that has undergone the first process.

(c) Problems to be solved by the invention However, there are many problems with any of the turret arrangements, such as workability, machine size, and tool interference between the turrets, and the arrangement is still unreliable. The reality is that this has not been established.

Furthermore, remove the workpiece from one chuck,
When attaching the workpiece to the other chuck,
A phase shift occurs on the axis, and after the transfer is completed,
When the workpiece is subjected to a second process such as milling with C-axis control, there is a problem in that the machining accuracy decreases. Furthermore, in connection with the above-mentioned tool rest arrangement, a tool rest arrangement that allows workpiece transfer to be performed as quickly as possible is desired.

In view of the above circumstances, the first object of the present invention is to provide a workpiece transfer method in an opposed spindle lathe that has good workability and solves the problem of tool interference. A workpiece transfer method in an opposed spindle lathe that allows a workpiece to be transferred between two spindles in a short time without causing a phase shift on the main axis, and after the transfer is completed, the workpiece can be processed with high precision. The purpose is to provide a control method.

(d) Means for solving the problem That is, the present invention has a frame 2, and on the frame 2, workpiece holding means 3b and 5b capable of holding a workpiece 36 are respectively provided. In a machine tool that rotatably supports a spindle and a second spindle and is provided with first and second headstocks facing each other, the first and/or second headstocks are connected to the spindles 3a and 5a. , and connects one tool rest corresponding to the first spindle and a second tool rest corresponding to the second spindle, to be relatively movable only in the axis direction of the spindle. The tool holding means 26a and 27a are arranged on the same side with respect to the line segment, and the tool holding means 26a and 27a are arranged on the first and second tool rests so as to be rotatably driven around an axis parallel to the spindle axis direction and rearward to each other. Set it up in the form of
A plurality of tools 2 are held in the tool holding means 26a and 27a.
9 is selectively and freely positioned so as to be able to face each corresponding spindle, and during machining, a workpiece 36 is held on the first spindle and the workpiece is machined in that state. Upon delivery, the first and second spindles are
an operation of positioning the first and/or second spindles at a predetermined delivery angle position by controlling the spindle angle;
an operation of holding the workpiece 36 by the spindle, and then, in that state, an operation of releasing the holding relationship between the workpiece and the first spindle, and relatively separating the first and/or second spindles. and performs a transfer operation consisting of an operation of holding the workpiece on the second spindle side, and after completing the transfer operation, performs a predetermined processing on the workpiece held by the second spindle. Ru.

Note that numbers in parentheses indicate corresponding elements in the drawings. This description is for convenience only, and therefore, the present description is not limited to the description in the drawings. The same applies to the column “(e)・Effect” below.

(e) Effect With the above configuration, the present invention provides the first and second
The spindles 3a and 5a are positioned at the delivery angle position by spindle angle control, and in this state, the workpiece 36 held by the first spindle is transferred to the second spindle.
Acts to deliver to the spindle side.

(f) Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a control block diagram showing an example of an opposed spindle lathe to which an embodiment of the method for controlling the transfer of workpieces in an opposed spindle lathe according to the present invention is applied, and FIG. 2 is a plan view of the opposed spindle lathe shown in FIG. 1. 3 to 10 are diagrams showing how a workpiece is machined using an embodiment of the workpiece transfer control method in an opposed spindle lathe according to the present invention, and FIG. 11 is a diagram showing how the workpiece in FIG. 12 is a view of the workpiece in FIG. 9 as viewed from the R arrow.

As shown in FIG. 1, the opposed spindle lathe 1 has a body 2 with a guide surface 2a provided on the upper part, and two headstocks 3 and 5 are mounted on the guide surface 2a.
are provided so as to face each other and to be movable independently in the directions of arrows A and B (that is, the Z-axis direction), which are the left and right directions in the figure. The headstocks 3 and 5 are provided with spindles 3a and 5a, respectively, in a form that can be rotated freely in the directions of arrows C and D, and the spindles 3a and 5a are provided with chucks 3b and 5b, respectively.
is mounted so as to be rotatable in the directions of arrows C and D.

Furthermore, spindle drive motors 3c and 5c are directly connected to the spindles 3a and 5a, respectively.
, the spindle drive motors 3c and 5, respectively.
a transducer 3d for detecting the amount of rotation angle in the directions of arrows C and D of c (therefore, the amount of rotation angle in the directions of arrows C and D of the spindles 3a and 5a);
5d is installed.

Furthermore, as shown in FIG. 1, the machine body 2 is provided with a headstock feed drive device 6, which includes nuts 3e, 5e, feed drive motors 7, 9, and a drive screw 10. , 11 etc.
That is, the lower ends of the headstocks 3 and 5 in FIG.
The body 2 is provided in such a way that it protrudes inward and is movable together with the headstocks 3 and 5 in the directions of arrows A and B (Z-axis direction). It is threaded so as to penetrate in the directions of arrows A and B. Also, Natsuto 3
Drive screws 10 and 11 having the same pitch are screwed into the drive screws 10 and 5e so as to be rotatable in the directions of arrows E and F, and feed drive motors 7 and 9 are connected to the drive screws 10 and 11, respectively. has been done. Transducers 7a and 9a are attached to the feed drive motors 7 and 9, respectively, for detecting the amount of rotation angle of the feed drive motors 7 and 9 in the directions of arrows E and F. In addition, by driving the feed drive motors 7 and 9,
By rotating the drive screws 10, 11 in the direction of arrow E or F, the headstocks 3, 5 are driven to move in the direction of arrow A or B (Z-axis direction) via nuts 3e, 5e, respectively.

Further, the opposed spindle lathe 1 has a main control section 12, as shown in FIG.
2, a machining program memory 15, a system program memory 16, a keyboard 17, a turret control section 39, 40, a feed drive motor control section 19, 20, a C-axis control section 21, 22 via a bus line 13.
and rotation speed control units 23 and 25 are connected. Here, the tool rest control section 39 is connected to the tool rest 26 shown in FIG. 2, and the tool rest control section 40 is connected to the tool rest 26 shown in FIG.
It is connected to the tool rest 27. Further, the feed drive motor 7 and the transducer 7a described above are connected to the feed drive motor control section 19, and the feed drive motor 9 and the transducer 9a are connected to the feed drive motor control section 20. There is.

Furthermore, the C-axis control section 21 is connected to a spindle drive motor 3c and a transducer 3d, and the C-axis control section 22 is connected to a spindle drive motor 5c and a transducer 5d.
Further, the rotation speed control section 23 is connected to a spindle drive motor 3c and a transducer 3d, and the rotation speed control section 25 is connected to a spindle drive motor 5c and a transducer 5d.

Further, in the upper part of FIG. 2 of the line connecting the axes of the headstocks 3 and 5 of the machine body 2, two turret-type tool rests 26 and 27 are located in the direction of arrows A and B, which is the Z-axis direction. is in the direction of perpendicular arrows G and H (i.e., the X-axis direction),
Each headstock 3, 5 can be moved and driven freely, respectively.
Therefore, the tool rests 26 and 27 are provided with turret heads 26a and 27a corresponding to the respective spindles 3a and 5a, respectively. It is supported so that it can be rotated freely. Tarot head 26
a, 27a is formed into a polygonal cylindrical shape as a whole, and on its side, a plurality of tools 29 consisting of turning tools such as bits, rotary tools such as drills, milling cutters, etc. are attached to each headstock 3, 5. It is set up in a manner that corresponds to the In addition, each tool has a corresponding headstock,
That is, the turret heads 26a, 27a are provided in such a way that they can face the spindle side.
The tools attached to the turret head 26a,
There is no interference between the turrets due to the rotating movement of 27a. In addition, each turret head 26
a, 27a have their sides facing each other,
Therefore, each turret head 26a, 27a is arranged behind the tool rest 26, 27.

Since the opposed spindle lathe 1 has the above-described configuration, when machining a workpiece, the workpiece 36 to be machined is first attached to the spindle 3a via the chuck 3b, as shown in FIG. At this time, the setup work for the chuck 3b of the workpiece 36 and the setup work for the tool 29 for the tool rest 26 are performed when the tool rests 26 and 27 are placed in the second position of the headstocks 3 and 5.
Since it is arranged at the upper part of the figure, it can be operated from the side where the tool rest is not located at the bottom in the figure without being obstructed by the tool rest, and the accessibility to the chuck 3b and the workability are good. Next, in this state, the operator instructs the main control section 12 to start machining the workpiece 36 via the keyboard 17. Then, the main control unit 12 selects a machining program corresponding to the workpiece 36 to be machined from the machining program memory 15.
Read PRO and based on the machining program PRO,
Predetermined processing is performed on the workpiece 36.

That is, the main control section 12 shown in FIG. 1 instructs the rotation speed control section 23 to rotate the spindle 3a in the direction of arrow C at a predetermined rotation speed NA set in the machining program PRO. Rotation speed control section 23
In response to this, the spindle drive motor 3c is rotated in the direction of arrow C together with the spindle 3a.
Then, the transducer 3d attached to the spindle drive motor 3c outputs a rotation signal RS1 to the rotation speed control section 23 at every predetermined rotation angle of the spindle drive motor 3c (therefore, the spindle 3a). The rotation speed control unit 23 counts the number of input rotation signals RS1 per predetermined time, and
The rotational speed of the spindle 3a is determined, and the rotational speed of the spindle drive motor 3c is controlled so as to reach a predetermined number of times NA.

The main control unit 12 shown in FIG.
The feed drive motor controller 19 is instructed to move the motor by a predetermined amount in the Z-axis direction. In response to this, the feed drive motor control section 19 controls the feed drive motor 7.
The drive signal D2 is output to. Then, the feed drive motor 7 rotates together with the drive screw 10 in the direction of arrow E or F, and moves the headstock 3 in the direction of arrow A or B (Z-axis direction) via the nut 3e. At this time, a rotation signal is sent from the transducer 7a attached to the feed drive motor 7 every time the feed drive motor 7 (therefore, the drive screw 10) rotates by a predetermined angle in the direction of arrow E or F. RS2 is output to the feed drive motor control section 19. The feed drive motor control unit 19 counts the number of input rotation signals RS2 and detects the amount of movement of the headstock 3 in the Z-axis direction, which is proportional to the amount of rotation angle of the feed drive motor 7 in the directions of arrows E and F. The amount of movement is the machining program.
Control so that the amount of movement is set during PRO.

Furthermore, the main control unit 12 controls the tool 2 used for machining.
9 and the amount of movement of the tool 29 in the X-axis direction. Then, the tool post control unit 39 appropriately rotates the turret head 26a of the tool post 26 in the direction of arrow I or J in FIG.
the tool rest 26.
is appropriately moved and driven in the directions of arrows G and H together with the turning tool 29, and the workpiece 36 is moved by the tool 29.
The outer diameter part is turned into a predetermined shape.

When the outer diameter portion of the workpiece 36 has been turned as shown in FIG. 3, the tool rest 26 is appropriately moved in the direction of arrow G to retreat from the workpiece 36, and in this state, the turret head 26a of the tool rest 26 is turned. is appropriately rotated in the direction of arrow I or J, and the tool 29 for internal turning, such as a drill or boring tool, is positioned at a position facing the workpiece 36. Next, in this state, the tool rest 26 and the tool 29 are fed a predetermined distance in the direction of arrow H in FIG.
While holding the work 36 on the chuck 3b, the inner diameter portion of the work 36 is machined using the tool 29 by moving and driving as appropriate in the directions of arrows A and B (Z-axis direction). In addition, after this processing, the headstock 3
, move it appropriately in the direction of arrow A in FIG.
is brought out of the inner diameter part of the workpiece 36, and in this state, the rotation of the chuck 3b in the C direction is stopped. Also,
In preparation for the next milling process, the tool rest 26 is moved in the direction of arrow G to retreat from the workpiece 36, and in this state, the milling tool 29 attached to the tool rest 26 is moved to a position facing the workpiece 36. Position it.

After the inner diameter portion of the workpiece 36 has been machined as shown in FIG. 4, the workpiece 36 is subjected to a milling process or the like involving C-axis control.
That is, the main control section 12 shown in FIG. 1 first instructs the C-axis control section 21 to return the spindle 3a to the origin. Then, the C-axis control section 21
rotates the spindle drive motor 3c at low speed in the direction of arrow C or D.

When the spindle 3a reaches a predetermined position, an origin detection signal OS1 is output from the transducer 3d to the C-axis control section 21. C-axis control section 21
Upon receiving this, immediately stops the rotational drive of the spindle drive motor 3c in the direction of arrow C or D.
Then, the spindle 3a also stops rotating in the direction of arrow C or D, and the predetermined reference position SP1 of the spindle 3a is moved to the C-axis origin as shown in FIG.
Positioned at CZP.

Next, the main control section 12 drives the tool post control section 39 to move the tool post 26 shown in FIG. 5 by a predetermined distance in the direction of arrow H while rotating the milling tool 29. Further, the headstock 3 is moved and driven in the direction of arrow B as appropriate. Then, the tool 2
9, a groove 36a is formed on the outer circumference of the workpiece 36.
is drilled and formed at a predetermined angle θ1 in the direction of arrow D from the C-axis origin CZP shown in FIG. Note that when the groove 36a is drilled, the tool rest 26
is appropriately moved in the direction of arrow G to retract the tool 29 from the workpiece 36. Next, main control section 1
2 outputs a C-axis control signal CS1 to the C-axis control section 21 shown in FIG. Then, the C-axis control section 21
The spindle drive motor 3c is rotated at low speed in the direction of arrow C together with the spindle 3a. Then,
A rotation signal RS3 is transmitted from the transducer 3d to C at every predetermined rotation angle of the spindle drive motor 3c.
It is output to the axis control section 21, and the C-axis control section 21
The number of input rotation signals R3 is counted to detect the rotation angle amount of the spindle 3a. C-axis control section 21
stops the rotational drive of the spindle drive motor 3c in the direction of arrow C when the amount of rotation angle reaches a predetermined amount of rotation angle θ2. Then, spindle 3a
also stops rotating in the direction of arrow C together with the workpiece 36,
The spindle 3a (therefore, the workpiece 36) is positioned at a position rotated by a predetermined angle θ2 in the direction of arrow C from the C-axis origin CZP.

Next, the tool rest 26 that was evacuated in this state
is moved along with the milling tool 29 a predetermined distance toward the workpiece 36 in the direction of arrow H in FIG. Then, a groove 36b is drilled in the outer peripheral portion of the workpiece 36 so as to be spaced from the previously drilled groove 36a by a predetermined angle θ2 in the direction of arrow D in FIG.

In this way, when milling etc. are performed on the workpiece 36 and the first step of machining is completed, the main control section 12 sends a workpiece delivery program from the system program memory 16 shown in FIG.
Call WTP and the corresponding work transfer program
We will carry out WTP. That is, the main control unit 12
First, the C-axis control section 21 is commanded to position the spindle 3a at the delivery position CP (see FIG. 11). In response to this, the C-axis control unit 21 drives the spindle drive motor 3c to slowly rotate the spindle 3a together with the workpiece 36 in the direction of arrow C or D. Then, the transducer 3d attached to the spindle drive motor 3c converts the rotation signal RS4 to C at every predetermined rotation angle in the direction of arrow C or D of the spindle drive motor 3c.
It is output to the axis control section 21.

Then, the C-axis control unit 21 receives the rotation signal RS4.
Count the number of inputs and find the position of the spindle 3a with respect to the C-axis origin CZP (see Figure 11),
The reference position SP1 of the spindle 3a is the C-axis origin
When positioned at the delivery position CP, which is a predetermined angle α away from CZP in the direction of arrow C, a stop signal is sent.
Spindle drive motor 3c with ST1 shown in Fig. 1
Output for. Then, the spindle drive motor 3c stops rotating in the directions of arrows C and D in response to this, and as a result, the spindle 3a moves toward the workpiece 36.
At the same time, the spindle 3a stops rotating in the direction of arrow C or D, and the spindle 3a is positioned at the delivery position CP. Note that it is also possible to select the C-axis origin (that is, when α=0) as the delivery position CP.

Further, the main control section 12 shown in FIG.
(See Figure 2). Then, the C-axis control unit 22 shown in FIG. 1 rotates the spindle drive motor 5c together with the spindle 5a at low speed in the direction of arrow C or D, and detects the rotation angle amount via the transducer 5d. Based on the rotation angle amount, the position of the spindle 5a in the directions of arrows C and D with respect to the C-axis origin CZP shown in FIG. 12 is determined, and the reference position SP of the spindle 5a is determined.
2 is a predetermined angle α in the direction of arrow C from the C-axis origin CZP.
When the spindle drive motor 5c is positioned at the delivery position CP, which is separated by the distance, the rotation of the spindle drive motor 5c is stopped. Then, the spindle 5a stops rotating in the direction of arrow C or D and is positioned at the delivery position CP.

In this way, each reference position of the spindles 3a, 5a
When SP1 and SP2 are positioned at the delivery position CP, the spindle 5 shown in FIG.
Loosen the chuck 5b attached to the spindle a, and in this state move the headstock 5 together with the spindle 5a in the direction of arrow A in FIG. 5 to bring the spindle 5a and spindle 3a closer together. The part where the first step was performed is the chuck 5b.
Insert it inside. In this state, the chuck 5b is tightened and the workpiece 36 is held by the chucks 3b, 5b.

When the workpiece 36 is held by the chucks 3b and 5b, the workpiece 36 and the chuck 3b
Release the holding relationship with the headstock 5, and in that state,
With the chuck 5b holding the workpiece 36,
The spindles 3a and 5a are separated by moving a predetermined distance in the direction of arrow B, that is, in the direction away from the headstock 3. Then, the workpiece 36 is transferred from the spindle 3a side to the spindle 5a side by the chuck 5b.
It will be transferred via. Note that this work 36 is transferred by the spindle 3a,
5a are respectively positioned at predetermined transfer positions CP by C-axis control, and the workpiece 36 is directly held by the chuck 5b attached to the spindle 5a. There will be no phase shift of the workpiece 36 with respect to the C-axis origin CZP.

In this way, the workpiece 36 that has completed the first step is
When the workpiece 36 is transferred to the spindle 5a side, the workpiece 36 is processed in the second step based on the machining program PRO corresponding to the workpiece 36, and the chuck 3 is transferred to the spindle 3a side.
An unprocessed workpiece 36 is mounted via b, and the previously described first step is performed on the unprocessed workpiece 36.

At this time, the turret heads 26a and 27a of the respective tool rests 26 and 27 are arranged rearward to each other, and the tools are mounted on the headstocks 3 and 27a corresponding to each other.
5, so that the tool 29 attached to one turret head 26a or 27a is attached to the other turret head 27a or 26a.
The turret 26, the headstock 3, and the turret 27 do not face the spindle 5a or 3a side.
The tools and the headstock 5 do not interfere with each other, and can operate independently of each other. As a result, no matter what state the headstock 5 and the turret 27 are in, that is, the workpiece 36 that has completed the first process and has been transferred from the spindle 3a side.
Even if machining is being carried out, on the headstock 3 side, the unprocessed workpiece 36 must be mounted on the chuck 3b (if necessary, the unprocessed workpiece 36 must be mounted on the turret head 26 of the tool rest 26).
Even setup work such as exchanging the tool 29 for a) can be performed regardless of the state of the headstock 5 and the tool rest 27, and there is no need to stop the operation of the headstock 5 side.

That is, the main control section 12 shown in FIG. 1 instructs the rotation speed control section 25 to rotate the spindle 5a in the direction of arrow C at a predetermined rotation speed NB.
Then, the rotation speed control unit 25 rotates the spindle drive motor 5c in the direction of arrow C together with the spindle 5a. At this time, the rotation speed control section 25 detects the rotation speed of the spindle drive motor 5c via the transducer 5d, and controls the spindle drive motor 5c so that the detected rotation speed becomes a predetermined rotation speed NB. control.

The main control section 12 shown in FIG. Or move it in the B direction (Z-axis direction). At this time, the feed drive motor control section 20 controls the headstock 5 via the transducer 9a.
The amount of movement is detected, and the drive motor 9 is controlled based on the detected amount of movement. Furthermore, the main control unit 12
The turret control unit 40 is driven to move the turret 27 along with the turning tool 29 to arrows G and H as shown in FIG.
By appropriately moving and driving the tool 29 in the direction
The outer diameter portion of the workpiece 36 is turned into a predetermined shape.

Moreover, as already mentioned, for the unprocessed workpiece 36 held by the chuck 3b shown in FIG. At the same time, the tool rest 26 is moved along with the turning tool 29 in the direction of arrows G and H.
A predetermined turning process is performed by appropriately moving and driving in the direction (X-axis direction).

At this time, the turret heads 26a and 27a of the respective tool rests 26 and 27 are arranged rearward to each other, and the tools are mounted on the headstocks 3 and 27a of the respective tool rests 26 and 27, respectively.
5. Therefore, since it is arranged so that it can face the spindles 3a, 5a, even if both tool rests 26, 27 are used together and machining is performed simultaneously with the headstocks 3, 5, the turret heads 26a, 27a The upper tools 29 do not interfere with each other, and simultaneous machining using both the headstocks 3 and 5 and the tool rests 26 and 27 can be performed smoothly.

In this way, when the outer diameter portions of the workpieces 36, 36 have been turned, as shown in FIG. 7, the tool rests 26, 27 are
6, 36 in the direction of arrow G, and in this state, the tools 29, 29 for internal turning mounted on the tool rests 26, 27 are positioned at positions facing each work 36. Next, the tool rests 26 and 27 are each sent a predetermined distance in the direction of the arrow H in FIG. , and in that state, move the headstocks 3 and 5 in the directions of arrows A and B (Z-axis direction), respectively.
The inner diameter portions of the unprocessed workpiece 36 and the workpiece 36 that has undergone the first process are processed into a predetermined shape. After the processing, the headstock 3 is moved in the direction of arrow A and the headstock 5 is moved in the direction of arrow B, as appropriate.
Each tool 29 mounted on the tool rest 26, 27 is taken out from each inner diameter portion. In that state, the tool rest 26,
27 is moved in the direction of arrow G to retreat from the workpiece 36, etc., and further, the rotation of chucks 3b and 5b in the direction of arrow C is stopped.

Next, in this state, the chuck 5b shown in FIG.
Drilling with C-axis control is performed on the workpiece 36 that has undergone the first step and is held in the same position, using a method similar to the method already described with reference to FIG.
That is, the main control section 12 shown in FIG. 1 drives the C-axis control section 22 to control the spindle drive motor 5c.
It is rotated together with the spindle 5a in the direction of arrow D at low speed. Then, the reference position SP2 of the spindle 5a shown in FIG. 12 also rotates in the direction of arrow D, and when the reference position SP2 coincides with the C-axis origin CZP, the first
An origin detection signal OS2 is output from the transducer 5d shown in the figure to the C-axis control section 22. In addition,
As shown in FIG. 12, when the reference position SP2 of the spindle 5a coincides with the C-axis origin CZP, the grooves 36a and 36b bored in the workpiece 36 during the first process As shown by imaginary lines in the figure, they are located at positions separated from the C-axis origin CZP by rotational angle amounts θ1 and (θ1+θ2) in the direction of arrow D, respectively. Furthermore, the C-axis control unit 22 outputs an origin detection signal.
From the moment OS2 inputs, transducer 5
When the amount of rotation angle of the spindle 5a in the direction of arrow D detected through d reaches a predetermined angle θ3, the spindle drive motor 5c is stopped.

Then, the spindle 5a is moved to its reference position SP.
2 is positioned a predetermined angle θ3 away from the C-axis origin CZP in the direction of arrow D in FIG.

Next, in this state, the tool rest 27 shown in FIG.
While rotating, a drilling tool 29 such as a drill is moved a predetermined distance in the direction of arrow H toward the workpiece 36, and the headstock 5 is further driven to move in the direction of arrow A as appropriate. Then, as described above, the workpiece 36 is processed in the first step on the spindle 3a side and then transferred to the spindle 5a side without any phase shift.
Holes 36c are formed in hole 36c in the direction of arrow C, respectively, at predetermined angles θ3 and (θ2+
A through hole is drilled at a distance of θ3).

In this way, when the second step of machining the workpiece 36 is completed, the chuck 5b is loosened, the machined workpiece 36 is removed from the chuck 5b, and the workpiece 36 is placed in the workpiece catcher 37 shown in the lower part of FIG. discharge. In addition, in parallel with this, the work 36 held by the chuck 3b shown in FIG.
For this, use the method already described and set the tool rest 26.
C by a tool 29 such as an end mill attached to
Milling with axis control is performed to drill grooves 36a and 36b shown in FIG. 11 in the workpiece 36. In this way, the workpiece 36 is continuously processed by performing the first step and the second step in parallel.

In addition, in the embodiment described above, the workpiece 36
When transferring the workpiece 36 from the spindle 3a side to the spindle 5a side, the workpiece 36 is transferred by moving the headstock 5 together with the spindle 5a in the direction of arrow A toward the spindle 3a of the headstock 3. Stated. However, the transfer method is not limited to this, and the headstocks 3 and 5 can be moved relative to arrows A and B.
Any method may be used as long as it is possible to bring the spindles 3a and 5a close to each other by moving them in the Z-axis direction and transfer the work 36 in that state. For example, headstock 3
is moved along with the spindle 3a toward the spindle 5a in the direction of arrow B, and the spindle 3a
It may also be delivered from the side to the spindle 5a side. Also, move the headstock 3 in the direction of arrow B, and move the headstock 5 in the direction of arrow A.
By moving the spindles 3a,
5 may be brought close to each other and the workpiece 36 may be delivered in this state.

In the above-mentioned embodiment, a case has been described in which the work is transferred between the spindles 3a and 5a based on the work transfer program WTP stored in the system program memory 16.
Any method may be used as long as the work 36 can be directly transferred between the parts 5a. For example, it is of course possible to store a machining program PRO created in a form that includes the content of the workpiece transfer program WTP in the machining program memory 15, and to perform the workpiece transfer operation based on the machining program PRO. be.

(g) Effects of the Invention As explained above, according to the present invention, the machine body 2 has a frame, and workpiece holding means such as the chucks 3b and 5b capable of holding the workpiece 36 are respectively mounted on the frame. The first and second headstocks, such as headstocks 3 and 5, which rotatably support the provided first spindle (e.g. spindle 3a) and second spindle (e.g. spindle 5a) are opposed to each other. In the machine tool provided, the first and/or second headstocks are provided so as to be relatively movable only in the axial direction of the spindle, and a first tool rest (for example, a cutter tool) is provided corresponding to the first spindle. 26) and a second spindle corresponding to the second spindle.
A turret head 26 (for example, a turret head 27) is placed on the same side of the line segment connecting the spindle axis, and a turret head 26 is placed on the first and second turrets.
Tool holding means such as a and 27a are provided so as to be freely drivable around axes parallel to the spindle axial direction and are arranged rearward to each other, and a plurality of tools 29 are attached to each of the corresponding spindles. The workpiece 36 is provided in such a way that it can be selectively positioned so that it can face the sides, and during processing, the workpiece 36 is held on the first spindle and the workpiece is processed in that state. 1st and 2nd
positioning the spindle at a predetermined delivery angle position by main axis angle control, moving the first and/or second spindles relatively close to each other, and holding the workpiece by the first and second spindles. operation, and then, in that state, an operation of releasing the holding relationship between the workpiece and the first spindle, and relatively separating the first and/or second spindles to move to the second spindle side. The configuration is such that a transfer operation consisting of an operation of holding the workpiece is performed, and after the transfer operation is completed, a predetermined processing is performed on the workpiece held by the second spindle, so that the first and second spindles are The workpiece 36 held on the first spindle side is positioned at the transfer angle position by controlling the spindle angle, and in that state, the workpiece 36 can be transferred directly to the second spindle side with its movement on the spindle restricted. I can do it. As a result, the workpiece 36 is moved from the first spindle side to the second spindle side at the C-axis origin CZP.
It is possible to transfer accurately without causing a phase shift with respect to the spindle reference point such as
When performing machining that involves axis control, it is not only possible to perform machining between the two spindles in an accurate relationship with each other, but also to keep the workpiece in a specified position even when transferring workpieces with irregular cross sections. The transfer operation can be performed while holding the grip at the correct position.

In addition, the first tool rest corresponding to the first spindle and the second tool rest corresponding to the second spindle are arranged on the same side with respect to the line segment connecting the spindle axis. , the setup work for tools 29, etc. can be carried out from the side where the tool rest is not located, for example in the lower part of FIG. .

Further, tool holding means are provided in the first and second tool rests so as to be rotatably driven at centers parallel to the spindle axis direction, and are arranged rearward to each other, and the tool holding means is provided with a plurality of tools. 29 can be selectively positioned so as to face each corresponding spindle side, so that the first tool rest and the first spindle, and the second tool rest and the second spindle can operate independently from each other. . As a result, no matter what condition the other spindle and turret are in,
In other words, the first
Even if the workpiece 36 whose process has been completed is being processed, setup work such as mounting the unprocessed workpiece 36 on the one spindle side is performed regardless of the state of the other spindle and the turret. There is no need to stop the operation of the other spindle. Moreover, even if the first and second tool rests are used together and machining is performed simultaneously by the first and second spindles, the tools 29 on the tool holding means will not interfere with each other, and both spindles and Simultaneous machining using the turret is performed smoothly.

In addition, the turret head 26 of the tool rest 26, 27
By arranging the turret heads 26a and 27a from the rear and setting their rotation centers parallel to the spindle axis direction (Z-axis direction), the Z angle between the two turret heads 26a and 27a is
The distance in the axial direction can be minimized without creating wasted space that does not contribute to machining operations, and the distance the headstock must move in the Z-axis direction when transferring workpieces can be reduced, allowing for high-speed workpiece transfer. It becomes operational. Further, with this configuration, when the maximum distance in the Z-axis direction between the headstocks 3 and 5 of the machine tool is made the same, it is possible to secure the maximum machinable area.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the work transfer control method in an opposed spindle lathe according to the present invention. A control block diagram showing an example of an opposed spindle lathe, FIG. 2 is a plan view of the opposed spindle lathe shown in FIG. For example, FIG. 11 is a view of the work in the direction of arrow Q in FIG. 5, and FIG. 12 is a view in the direction of arrow R of the work in FIG. 9. 1... Opposing spindle lathe, 3a, 5a... Spindle, 3b, 5b... Work holding means (chuck), 36... Work, CP... Delivery angle position (delivery position).

Claims (1)

[Scope of Claims] A first spindle and a second spindle, each having a frame and rotatably supporting a first spindle and a second spindle, each of which is provided with a work holding means capable of holding a work. In a machine tool in which second headstocks are provided oppositely to each other, the first and/or second headstocks are provided so as to be relatively movable only in the axial direction of the spindle, and Correspondingly, the first turret
Also, a second tool rest corresponding to the second spindle,
The tool holding means is disposed on the same side with respect to a line segment connecting the spindle axis, and the tool holding means is mounted on the first and second tool rests so as to be rotatably driven around an axis parallel to the spindle axis direction and on the back side of each other. A plurality of tools are provided in the tool holding means in such a manner that they can be selectively positioned so as to face each of the corresponding spindles, and during machining, a workpiece is placed on the first spindle. is held, and the workpiece is processed in that state; upon delivery, the first and second spindles are positioned at a predetermined delivery angle position by spindle angle control; the first and/or An operation of moving the second spindle relatively close to each other and holding the workpiece by the first and second spindles; Next, in this state, an operation of releasing the holding relationship between the workpiece and the first spindle. and performing a transfer operation consisting of an operation of relatively separating the first and/or second spindles and holding the workpiece on the second spindle side, and after completing the transfer operation, transferring the workpiece to the second spindle side. A workpiece transfer control method in an opposed spindle lathe configured to perform predetermined machining on a workpiece held in the machine.