JPH0242603B2 - - Google Patents

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is applied to an opposed spindle lathe having two spindles facing each other when transferring a workpiece between the spindles. , relates to a work transfer control method in an opposed spindle lathe.

(b) Prior Art Normally, in an opposed spindle lathe having two spindles facing each other, in order to process a workpiece, the workpiece is attached to one of the spindles via a chuck pawl, and the first step of machining is performed. After completing the first process, the workpiece is transferred to the chuck claw attached to the other spindle using a handling robot, etc., and after the transfer is completed, the workpiece that has undergone the first process is processed in the second process. is being carried out.

(c) Problems to be Solved by the Invention However, with this method, when the workpiece is removed from one chuck and attached to the other chuck, a phase shift occurs on the C-axis of the workpiece, 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 accuracy decreases.

Therefore, the first spindle that holds the workpiece that has completed the first step and the second spindle that carries out the second step are brought relatively close together, and the workpiece that has completed the first step is transferred from the first spindle side to the second spindle side. Direct transfer is also an option, but if the work is a thin work, the claws that hold the work on the first and second spindles will interfere with each other during transfer, making it impossible to transfer the work smoothly. This will cause inconvenience.

In addition, in view of the recent trend towards increasing the efficiency of machining operations, it is necessary to structurally arrange the headstock and tool rest so that the workpiece transfer operations between the spindles described above can be carried out quickly and in a short period of time.

In view of the above circumstances, the present invention provides a machining control method for an opposed spindle lathe, which allows workpieces such as thin workpieces to be transferred between spindles without interference between the claws of each spindle, and moreover, in a short time. The purpose is to

(d) Means for solving the problem That is, the present invention has a frame 2, and a workpiece holding means 3 capable of holding a workpiece on the frame.
b, 5b rotatably support a first spindle and a second spindle provided thereon, respectively;
In a machine tool in which the first and second headstocks 3 and 5 are provided to face each other, the first and/or the second headstock
A headstock is provided so as to be relatively movable only in the axial direction of the spindle, a first tool rest corresponding to the first spindle, and a second tool rest corresponding to the second spindle, The first and second
Tool holding means 26a and 27a are provided on the tool rest in such a manner that they can be rotated freely about axes parallel to the spindle axis direction and are arranged rearward to each other, and a plurality of tools 29 are supported by the tool holding means. rotational angle positioning means 3c, 5c, 21, 22, which can selectively and freely position the first and second spindles, and which can position the first and second spindles at arbitrary rotational angle positions; is provided, and during machining, the work 36 is held on the first spindle, and the work is machined in that state, and upon delivery, the rotational angle positioning means 3c, 5c, 21, 22 The operation of angularly positioning the first spindle together with the workpiece holding means at the transfer position, and the operation of angularly positioning the second spindle together with the workpiece holding means, and adjusting the phase between the claws of the workpiece holding means of the first spindle and the claws of the second workpiece holding means. angularly positioning the first spindle at a predetermined angle with respect to the work holding means, bringing the first and/or second spindles into relative proximity to each other in a different manner; an operation of holding the workpiece by the second spindle, then an operation of releasing the holding relationship between the workpiece and the first spindle in that state, and an operation of releasing the holding relationship between the workpiece and the first spindle;
Alternatively, a transfer operation is performed in which the second spindle is relatively separated and the workpiece is held on the second spindle side, and after the transfer is completed, the workpiece held by the second spindle is transferred to a predetermined position. The machine is configured to perform processing.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The same applies to the column "(e). Effect" below.

(e) Effect With the above-described configuration, the present invention allows the first and second spindles 3a,
The claws of the work holding means 5a are positioned with different phases so as not to interfere with each other.

(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 work transfer control method 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. , FIGS. 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 the Q arrow of the workpiece in FIG. View: FIG. 12 is a view of the workpiece in FIG. 9 as seen from arrow R.

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, the machine body 2 is provided with a headstock feed drive device 6, as shown in FIG. , 11 etc. That is, at the lower ends of the headstocks 3 and 5 in FIG.
The nuts 3e and 5e each have female threads (not shown) that pass through the nuts 3e and 5e in the direction of arrows A and B, which is the Z-axis direction. It is screwed. Furthermore, drive screws 10 and 11 having the same pitch are screwed into the nuts 3e and 5e, respectively, so as to be rotatable in the directions of arrows E and F. 9 is connected. The feed drive motors 7 and 9 are provided with transducers 7a and 9a for detecting the amount of rotation angle of the feed drive motors 7 and 9 in the directions of arrows E and F, respectively.
is installed. In addition, the feed drive motors 7 and 9
and drive the drive screws 10 and 11 in the direction of arrow E or F.
By rotating in the direction, the headstocks 3 and 5 are rotated in the direction of arrow A or B via nuts 3e and 5e, respectively.
direction (Z-axis direction).

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 spindle axes of the headstocks 3 and 5 of the machine body 2, two turret-type tool rests 26 and 27 are aligned in the directions of arrows A and B, which is the Z-axis direction. Directions of arrows G and H (i.e., X
The tool rests 26 and 27 are provided with turret heads 26 and 27, respectively, so as to be movable and driveable in the axial direction) and corresponding to the respective headstocks 3 and 5.
a, 27a are supported so as to be rotatably driven in directions of arrows I and J about a pivot axis parallel to the Z axis. The turret heads 26a, 27a are entirely formed into a polygonal cylindrical shape, and a plurality of tools 29 including turning tools such as cutting tools, rotating tools such as drills and milling cutters, etc. are mounted on the sides of each headstock 3, It is designed to correspond to 5. Note that each tool is provided in such a way that it can face the corresponding headstock side, and therefore each turret head 26a,
The tools attached to 27a are connected to the turret head 2.
There is no interference caused by the turning operations of 6a and 27a. In addition, each turret head 26a, 27
a has its sides facing each other, so each turret head 26a, 27a is connected to the tool rest 26, 2.
It is arranged rearward to 7.

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 carried out from the side where the lower part of the figure is not provided with the turret without being obstructed by the turret, and the access to the chuck 3b and the workability are good. Next, in this state, the operator selects the main controller 12 via the keyboard 17.
A command is given to start machining of the workpiece 36. Then,
The main control unit 12 stores a machining program corresponding to the workpiece 36 to be machined from the machining program memory 15.
The program PRO is read out, and a predetermined process is performed on the workpiece 36 based on the process program PRO.

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 to a predetermined rotational speed 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, feed the tool rest 26 along with the tool 29 a predetermined distance in the direction of arrow H in FIG. The inner diameter portion of the workpiece 36 is machined by the tool 29 by moving and driving the workpiece 36 as appropriate in the 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 at

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 unit 12 drives the tool post control unit 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 29
Accordingly, a groove 36a is formed on the outer periphery of the workpiece 36.
It is drilled and formed at a distance of a predetermined angle θ1 in the direction of arrow D from the C-axis origin CZP shown in FIG. In addition,
Once the groove 36a has been drilled, the tool rest 26 is
The tool 29 is moved in the direction of arrow G as appropriate to retreat from the workpiece 36. Next, the main control section 12
is a C-axis control signal to the C-axis control section 21 shown in FIG.
Output CS1. Then, the C-axis control unit 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 RS3 is counted to detect the rotation angle amount of the spindle 3a. C-axis control section 2
1 stops the rotational drive of the spindle drive motor 3c in the direction of arrow C when the rotation angle amount reaches a predetermined rotation angle amount θ2. Then, spindle 3
a also stops rotating in the direction of arrow C together with the workpiece 36, and the spindle 3a (therefore the workpiece 36)
It 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 transfers the 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. In addition, as a delivery position CP if necessary,
It is also possible to select the C-axis origin (ie, when α=0). That is, the main transfer operation is performed by the spindle 3.
When transferring the work between spindles 3a and 5a, the angular position of the workpiece in the C-axis direction is
The delivery position CP may be set at any angular position, such as the spindle orientation position, as long as it does not change. Therefore, the C-axis coordinate position α is
It suffices if a and 5a are constant, for example, the first
Spindle 3a has α=40°, second spindle 5a
is α=60°, and if the chuck pawls of spindles 3a and 5a interfere with each other during transfer, position the chuck pawls of both spindles 3a and 5a at an arbitrary angular position where the phases are different, and adjust the chuck pawls. Of course, it is also possible to prevent interference. This is particularly effective when the work is a thin work.

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, and the chuck 5b attached to the spindle 5a directly holds the workpiece 36, so that the C of the workpiece 36 is transferred. There is no phase shift with respect to the 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, the tool mounted on one turret head 26a or 27a will not face the spindle 5a or 3a side of the other turret head 27a or 26a.
The tools of the tool rest 26 and the headstock 3, and the tool rest 27 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,
Even if the workpiece 36 that has completed the first process, which was transferred from the spindle 3a side, is being processed, the workpiece 36 that has not been processed is mounted on the chuck 3b (if necessary, the cutter is attached) on the headstock 3 side. (Even setup work such as replacing the tool 29 on the turret head 26a of the stand 26) can be performed regardless of the status of the headstock 5 and the turret 27, and there is no need to stop operation on 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.
Since the turret heads 26a and 5 are arranged in such a way that they can face each other, even if both tool rests 26 and 27 are used together and machining is performed simultaneously with the headstocks 3 and 5, the turret heads 26a,
The tools 29 on the 27a do not interfere with each other, and both the headstocks 3 and 5 and the tool rests 26 and 2
Simultaneous machining by 7 is carried out smoothly.

In this way, as shown in FIG. 7, the outer diameter portions of the workpieces 36, 36 have been turned, respectively, and the tool rests 26, 27 have been turned.
36 in the direction of arrow G, and in this state, the internal turning tools 29, 29 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 arrow H in FIG.
The tool 29 for internal turning is placed on the right end surface of the unprocessed workpiece 36 in the figure, and on the workpiece 36 that has undergone the first process.
In this state, the headstock 3,
5 are moved in the directions of arrows A and B (Z-axis direction), respectively, and 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 machining, the headstock 3 is appropriately moved in the direction of arrow A, and the headstock 5 is appropriately moved in the direction of arrow B, so that the tools 29 mounted on the tool rests 26 and 27 are taken out from each inner diameter portion. In this state, the tool rest 26, 2
7 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 as described above using a method similar to that 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 at low speed in the direction of arrow D. Then, the spindle 5a shown in FIG.
The reference position SP2 also rotates in the direction of arrow D, and when the reference position SP2 coincides with the C-axis origin CZP, the origin detection signal OS2 is output from the transducer 5d shown in FIG. 1 to the C-axis control unit 22. be done. 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 step 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, after the workpiece 36 is processed in the first step on the spindle 3a side, a phase shift occurs on the spindle 5a side while maintaining the C-axis angular positions of the spindles 3a and 5a. Since the workpiece 36 is directly transferred without any interference, a hole 36c is formed in the workpiece 36, and the groove 36 shown by the broken line in FIG. 12 is formed in the first step.
A and 36b, respectively, are drilled through the holes at exactly predetermined angles θ3 and (θ2+θ3) apart from each other in the direction of arrow C.

In this way, when the second step of machining the workpiece 36 is completed, the chuck 5b is loosened and
The processed workpiece 36 is removed from the chuck 5b, and the workpiece 36 is discharged into a workpiece catcher 37 in the lower part of FIG. In parallel, the workpiece 36 held by the chuck 3b shown in FIG. Perform milling with axis control,
Grooves 36a and 36b shown in FIG. 11 are formed in the workpiece 36.
to be drilled. 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 from the spindle 3a side to the spindle 5a side, the headstock 5 is transferred together with the spindle 5a,
A case has been described in which the workpiece 36 is transferred by being moved in the direction of arrow A toward the spindle 3a of the headstock 3. However, the delivery method is
Not limited to this, the headstocks 3 and 5 are relatively
Any method may be used as long as the spindles 3a and 5a can be brought close to each other by moving in the B direction (Z-axis direction) and the workpiece 36 can be transferred in this state. For example, by moving the headstock 3 together with the spindle 3a in the direction of arrow B toward the spindle 5a,
It may also be transferred from the a side to the spindle 5a side.
Also, by moving the headstock 3 in the direction of arrow B and the headstock 5 in the direction of arrow A, the spindle 3
a and 5a close to each other, and in that state workpiece 3
You may pass 6.

In the embodiment described above, the spindles 3a and 5 are controlled based on the work transfer program WTP stored in the system program memory 16.
As described above, the workpiece is transferred between spindles 3 and 3.
Any method may be used as long as it is possible to directly transfer the work 36 between a and 5a. For example, it goes without saying that a machining program PRO created including the contents of the workpiece transfer program WTP may be stored in the machining program memory 15, and the workpiece transfer operation may be performed based on the machining program PRO. be.

(g) Effect of the invention As explained above, according to the present invention, the aircraft 2
A first spindle (e.g., spindle 3a) and a second spindle (e.g., spindle 5a) are provided with workpiece holding means such as chucks 3b and 5b capable of holding a workpiece on the frame. ) rotatably supported,
In a machine tool in which first and second headstocks, such as headstocks 3 and 5, are provided to face each other, the first and/or second headstocks are positioned relative to each other only in the axial direction of the spindle. A first turret (for example, turret 2) is provided movably and corresponds to the first spindle.
6), and a second tool rest (for example, tool rest 27) corresponding to the second spindle is arranged on the same side with respect to the line segment connecting the spindle axis, and the first and second Turret head 26a, 2 on the turret
Tool holding means such as 7a are provided so as to be freely rotatable about an axis parallel to the spindle axis direction and arranged rearward to each other, and a plurality of tools 29 are attached to the respective spindle sides corresponding to the tool holding means. Drive motors 3c and 5 are provided so as to be selectively positionable in a manner that they can face each other, and furthermore, drive motors 3c and 5 can position the first and second spindles at arbitrary rotation angle positions.
c. Rotation angle positioning means such as C-axis control units 21 and 22 are provided, and during machining, the work is held on the first spindle, the work is machined in that state, and when it is delivered, An operation of angularly positioning the first spindle together with the workpiece holding means at the transfer position CP by the rotational angle positioning means; angular positioning of the first spindle at a predetermined angle with respect to the workpiece holding means in a manner in which the phases of the claws of the workpiece holding means are different, and the first and/or second spindles are brought relatively close to each other. and holding the workpiece by the first and second spindles, and then, in that state, releasing the holding relationship between the workpiece and the first spindle, and the first and/or Performing a transfer operation consisting of an operation of relatively separating the second spindle and holding the workpiece on the second spindle side, and after completing the transfer,
Since the structure is configured to perform a predetermined processing on the workpiece held by the second spindle, when the first and second spindles are brought relatively close to each other and the workpiece is transferred between the two spindles, Since the claws of the work holding means of both spindles are angularly positioned with different phases, even in the case of so-called thin workpieces whose length in the spindle axis direction is short, the workpiece transfer operation can be carried out by the work holding means of both spindles. This can be done smoothly without interfering with the nails. Furthermore, even if the workpiece held by the first spindle is an irregularly shaped workpiece, it is possible to position it at an angular position where the second spindle can grip it, with the claws of both spindles having different phases. Various transfer operations between spindles are possible.

Further, a first tool rest corresponding to the first spindle and a second tool rest corresponding to the second spindle are arranged on the same side with respect to a line segment connecting the spindle axis, Since tool holding means are provided in the first and second tool rests so as to be freely rotatable about axes parallel to the spindle axial direction and arranged rearward to each other, the tool holding means is provided between the first and second spindles. Since there is no need for a tool rest or the like to be located between the tool holding means, the distance between the first and second headstocks can be reduced if the same machining area is secured in the Z-axis direction. can be minimized,
When the first and second spindles move toward each other during transfer, the distance until the workpiece held by the first spindle is held by the second spindle can be made the shortest distance. This makes it possible to quickly transfer the workpiece between the two spindles in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram showing an example of a counter-spindle lathe to which an embodiment of the method for controlling work transfer in a counter-spindle lathe according to the present invention is applied, and FIG. 2 is a plan view of the counter-spindle lathe shown in FIG. 1. , FIGS. 3 to 10 are diagrams showing how a workpiece is machined using an embodiment of the workpiece transfer control method in a counter-spindle lathe according to the present invention, and FIG. 11 is a diagram showing the Q arrow of the workpiece in FIG. The perspective view, FIG. 12, is a view of the workpiece in the direction of arrow R in FIG. 9. 1... Opposing spindle lathe, 3a, 5a... Spindle, 3b, 5b... Work holding means (chuck), 26a, 27a... Tool holding means (turret head), 29... Tool, 36... Work,
CP...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
Further, a second tool rest corresponding to the second spindle is disposed on the same side with respect to a line connecting the spindle axis, and a tool holding means is attached to the first and second tool rests on the spindle axis. A plurality of tools are provided in the tool holding means so as to be freely rotatable around an axis parallel to the center direction and arranged rearward to each other, and selectively position a plurality of tools in the tool holding means so that they can face each corresponding spindle side. Furthermore, a rotation angle positioning means is provided which can position the first and second spindles at arbitrary rotation angle positions, and during machining, the workpiece is held on the first spindle and the workpiece is held in that state. Processing is performed on the workpiece, and upon delivery, the rotational angle positioning means
angularly positioning the second spindle together with the workpiece holding means at the transfer position;
angular positioning at a predetermined angle with respect to the work holding means of the first spindle in such a way that the phases of the claws of the work holding means of the spindle and the claws of the second work holding means are different; an operation of holding the workpiece by the first and second spindles by bringing the first and/or second spindles relatively close together, and then, in that state, a holding relationship between the workpiece and the first spindle; performing a transfer operation consisting of an operation of releasing the first and/or second spindles, and an operation of holding the workpiece on the second spindle side by relatively separating the first and/or second spindles, and after completing the transfer, A workpiece delivery control method in an opposed spindle lathe configured to perform predetermined machining on a workpiece held by a second spindle.