JPS63300801A - Machining control method in opposed-spindle lathe - Google Patents

Abstract

PURPOSE:To prevent generation of phase shifting of a workpiece on its C-axis, when the workpiece is delivered, by constituting a lathe positioning the first and second spindles in a delivery position so as to deliver the workpiece in that condition. CONSTITUTION:A chuck 36 of the first spindle holds a workpiece 36, and in that condition, machining involving a C-axis control is performed for the workpiece 36. After the machining, positioning the first and second spindles in a predetermined delivery position CP while moving the first and second spindles approaching, the workpiece 36 is held by chucks 3b, 5b of the first and second spindles. Next in that condition, releasing the workpiece 36 and the chuck 3b from their holding relation further separating the first spindle from the second spindle, the workpiece 36 is held by the chuck 5b of the second spindle, and in this condition, the predetermined machining involving the C-axis control is performed for the workpiece 36.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is directed to an opposed spindle lathe having two opposing spindles, in which a workpiece is moved between the spindles.
It is possible to perform milling processing or the like that involves C-axis control by transferring the parts without causing a phase shift on the C-axis. This invention relates to a machining control method in an opposed spindle lathe.

(b) 8 Prior Art Usually, in an opposed spindle lathe having two spindles facing each other, in order to process a workpiece, the workpiece must be
The workpiece is attached to one of the spindles via a chuck and processed in the first step, and after the first step is completed, the workpiece is transferred to the chuck attached to the other spindle using a handling robot, etc., and the transfer is completed. After that, the second process is performed on the workpiece that has undergone the first process.

(C) 0 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, However, when a workpiece is subjected to a second process such as milling with C-axis control, there is a problem in that the accuracy decreases.

In view of the above circumstances, the present invention provides the following features:
Machining control in an opposed spindle lathe that can transfer a workpiece without causing a phase shift on the C-axis, and after completion of the transfer, perform milling, etc. with C-axis control on the workpiece with high accuracy. The purpose is to provide a method.

(d) Means for solving the zero problem, that is, zero The present invention holds a workpiece (36) on the first spindle (3a), and in that state C,! Ill
Performs controlled processing.

After the processing, the first and second spindles (38° 5A
) at the prescribed delivery position! (CP), the first and second spindles (5a) are brought close to each other, and the workpiece (36) is held by the first and second spindles (5a). Then, the holding relationship between the workpiece (36) and the first spindle (3a) is released.

Furthermore, the first and second spindles (5a) are allowed to cross-breed, and the workpiece (3) is placed on the second spindle (5a) side.
6) is held, and in that state, the workpiece (36) is subjected to a predetermined processing accompanied by C@ control.

Please note that numbers in parentheses, etc. are [! ! ! It is for convenience only to show corresponding elements on one side, and therefore, this description is not limited to the description on the drawings.
The same applies to C8), “Effect” column.

(e) 1 Effect With the above configuration, 1 the present invention positions the first and second spindles (3a, 5a) at the transfer position (CP) and holds them in the first spindle (3a) in that state. The workpiece (36) transferred to the second spindle (5a) side is operated.

(f), Example Embodiments of the present invention will be described below 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 processing control method for an opposed spindle lathe according to the present invention is applied.

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 machining control method in an opposed spindle lathe according to the present invention, and FIG. 11 is a view of the workpiece in the direction of arrow Q in FIG. .

FIG. 12 is a view of the workpiece in the direction of arrow R in FIG. 9.

As shown in FIG. 1, the opposed spindle lathe 1 has a body 2 provided with a guide surface 2a on the upper part.
On a, two headstocks 3 and 5 are provided so that they face each other and can be driven independently to move in the directions of arrows A and B (i.e., the Z-axis direction), which are the left and right directions in the figure. ing. Headstock 3,
5, spindles 3a and 5a are respectively indicated by arrows C and D.
Chucks 3b and 5b are mounted on the spindles 3a and 5a, respectively, so as to be rotatable in the directions of arrows C and D.

Further, spindle drive motors 3c and 5G are directly connected to the spindles 3a and 5a, respectively.
The spindle drive motors 3c and 5C each include a spindle drive motor 3c.

Transducers 3d and 5d are mounted for detecting the amount of rotation angle of the spindles 5c in the direction of the arrow C1D (therefore, the amount of rotation angle of the spindles 3a and 5a in the directions of the arrows C and D).

Furthermore, as shown in FIG. 1, the machine body 2 is provided with a headstock feed drive bag [6, and the headstock feed drive device 6 is
It has nuts 3e, 5a, a feed drive motor 7.9, a drive screw 10.11, etc. That is, the first part of the headstock 3.5
At the bottom end of the figure, nuts 3e and 5e are respectively attached to the guide surface 2.
protrudes into the machine body 2 through a, and connects the machine body 2 with the headstock 3.
．． Nuts 3e and 5e are provided so as to be movable in the directions of arrows A and B (ZN direction) together with arrow A, and the nuts 3e and 5e each have female threads (not shown) in biaxial directions.

It is threaded so as to penetrate in the B direction. Also, Natsuto 3
Drive screws 10.e and 5e each have the same pitch.
11 are screwed together so as to be rotatable in the directions of arrows E and F,
The drive screws 10.11 each have a feed drive motor 7.
9 is connected.

Transducers 7a and 9a are mounted on the feed drive motor 7.9 for detecting the amount of rotation angle of the feed drive motor 7.9 in the directions of arrows E and F, respectively. In addition,
Drive the feed drive motor 7.9 to drive the drive screw 10.11.
By rotating in the direction of arrow E or F, the headstock 3,
5 is driven to move in the direction of arrow A or B (Z-axis direction) via nuts 3e and 5e, respectively.

Moreover, as shown in FIG. 1, the opposed spindle lathe 1 has the following features:
The main controller 12 has a computer program memory 15, a system program memory 16, a keyboard 17 . Turret control section 3
9.4o, the feed drive motor control section 19.20, the C-axis control sections 21, 22, and the rotation speed control section 23.25 are connected, and the tool post control section 39 is connected to the cutter tool shown in FIG. stand 2
6, and the tool post control section 4o is connected to the tool post 2.
・Connected to 7. In addition, the feed drive motor control section 19
The above-mentioned feed drive motor 7 and transducer 7a are connected to the feed drive motor control section 20.
A feed drive motor 9 and a transducer 9a are connected.

The C-axis control unit 21 also includes a spindle drive motor 3c.
and a transducer 3d, and a spindle drive motor 5c and a transducer 5d are connected to the C411 control section 22.

Furthermore, the one rotation speed control section 23 includes a spindle drive motor 3.
The spindle drive motor 5c and the transducer 5d are connected to the rotation speed control section 25.

Furthermore, as shown in FIG.
The tool rests 26 and 27 have turret heads 26a and 27a, respectively. , arrow 1. It is supported so that it can be rotated freely in the J direction. In addition, the turret heads 26a, 27
A plurality of tools 29 including turning tools such as cutting tools and rotary tools such as drills and milling cutters are removably attached to a.

Since the opposed spindle lathe machine has the above configuration, when machining a workpiece, first the workpiece 3 to be machined is
6 is attached to the spindle 3a via the chuck 3b as shown in Fig. m1.

Next, in that state, the worker uses the keyboard 17 to
The main control unit 12 is commanded to start machining the workpiece 36. Then, the main control unit 12 selects the cannibal program PRO corresponding to the workpiece 36 to be machined from the cannibal program memory 15.
is read out, and predetermined machining is performed on the workpiece 36 based on the cutting program PRO.

That is, the main control section 12 shown in FIG.
The spindle 3a is rotated in the direction of arrow C at a predetermined rotation speed NA set by RO.

In response to this, the one-rotation speed control section 23 instructs the rotation speed control section 23 to move the spindle drive motor 3c to the spindle 3.
Rotate it in the direction of arrow C along with a.

Then, the transducer 3d attached to the spindle drive motor 3c outputs a one-rotation signal R8I to the rotation speed controller 23 for every predetermined rotation angle of the spindle drive motor 3c (therefore, the spindle 3a). The one-rotation speed control unit 23 calculates the rotation speed of the spindle 3a by inputting the number of rotation signals R5I per predetermined time, and controls the rotation speed of the spindle drive motor 3c to a predetermined rotation speed NA. Control.

Further, the main control section 12 shown in FIG. 1 instructs the feed drive motor control section 19 to move the headstock 3 by a predetermined amount in the Z-axis direction. In response to this, the feed drive motor control section 19 outputs a drive signal D2 to the feed drive motor 7.

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, the transducer 7a attached to the feed drive motor 7 sends a one-rotation signal R52 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. is output to the feed drive motor control section 19. The feed drive motor control section 19 receives the rotation signal R5.
Count the number of inputs in step 2 and press the arrow E of the feed drive motor 7.
, was proportional to the amount of rotation angle in the F direction. The amount of movement of the headstock 3 in the Z# force direction is detected and controlled so that the amount of movement becomes the amount of movement set during the cutting program PRO.

Further, the main control section 12 instructs the tool post control section 39 to select the tool 29 used for machining and control the amount of movement of the tool 29 in the XM force direction. Then, the tool post control section 39
The turret head 26a of the tool rest 26 is rotated appropriately in the arrow direction or J direction in FIG.
is positioned to face the workpiece 36, and the tool rest 26 is moved and driven as appropriate in the directions of arrows G and H together with a turning tool 29, and the outer diameter portion of the workpiece 36 is shaped into a predetermined shape by the tool 29. Turning.

After the outer diameter portion of the workpiece 36 has been turned as shown in FIG. 26a is appropriately rotated in the direction of the arrow (■) or J, and the tool 29 for internal turning, such as a drill or a boring rebit, is positioned at a position facing the workpiece 36.

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 portions of the works 3 and 6 are machined using the tool 29. After the machining, the headstock 3 is appropriately moved in the direction of arrow A in FIG. 4 to take the tool 29 out of the inner diameter of the workpiece 36, and in this state, the rotation of the chuck 3b in the direction C is stopped. do. In preparation for the next milling process, the tool rest 26 is moved in the direction of arrow C to retreat from the workpiece 36, and in this state, the milling tool 29 mounted on the tool rest 26 is moved toward the workpiece 36. Position it at the desired position.

After the inner diameter portion of the workpiece 36 has been machined as shown in the fourth step, milling processing or the like involving C-axis control is performed on the workpiece 36.

That is, the soil control section 12 shown in FIG.
1 to return the spindle 3a to its origin. Then, the C-axis control unit 21 rotates the spindle drive motor 3c in the direction of arrow C or D at low speed.

When the spindle 3a reaches a predetermined position, an origin detection signal O51 is output from the transducer 3d to the C-axis control section 21. Upon receiving this, the C-axis control unit 21 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 returns to a predetermined reference position 5WSP of the spindle 3a.
1 is positioned at CMM point czp as shown in FIG.

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. Then, the headstock 3 is moved and driven in the direction of arrow B as appropriate. Then, a groove 36a is formed in the outer peripheral portion of the workpiece 36 by the tool 29 so as to be spaced by a predetermined angle θ1 in the direction of the arrow from the origin C2P shown in FIG.

Note that when the groove 36a is drilled, the tool rest 26 is
The tool 29 is evacuated from the workpiece 36 by appropriately moving in the direction of arrow G. Next, the main control section 12 outputs a C# control signal CSI to the C@ control section 21 shown in FIG. Then, the C-axis control unit 21 rotates the spindle drive motor 3c together with the spindle 3a at a low speed in the direction of arrow C. Then, the transducer 3d outputs a rotation signal R53 to the C-axis control unit 21 at every predetermined rotation angle of the spindle drive motor 3C, and the C-axis control unit 21 counts the number of input rotation signals R83. , detects the amount of rotation angle of the spindle 3a. The C-axis control unit 21 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, the spindle 3a also stops rotating in the direction of arrow C together with the workpiece 36, and the spindle 3a (therefore, the workpiece 36
) is a predetermined angle 02 in the direction of arrow C from the C-axis origin CZP.
is positioned at a rotated position.

Next, the tool rest 26 that has been retracted in this state is moved a predetermined distance toward the workpiece 36 in the direction of arrow H in FIG.
is appropriately moved and driven in the direction of arrow B. Then, a groove 36b is drilled in the outer door portion of the workpiece 36 at a predetermined angle θ2 N'' in the direction of the arrow in FIG. 11 from the previously drilled groove 36a.

In this way, when milling etc. are performed on the workpiece 36 and the first process is completed, the main control unit 1
2 calls the work transfer program WTP from the system program memory 16 shown in FIG. 1 and executes the work transfer program WTP.

First, the C-axis control unit 21 determines the delivery position W of the spindle 3a.
Command the CP (see Fig. 11) to position.

Then, in response to this, the C@ 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 outputs a rotation signal R54 to the C-axis control unit 21 every predetermined rotation angle of the spindle drive motor 3c in the direction of arrow C or D.

Then, the C@ control unit 21 counts the number of input rotation signals R54 and determines the C-axis origin czp (
(see Fig. 11), and determine the position relative to the spindle 3a.
Standard position! When the SPI is positioned at the transfer position CP that is a predetermined angle α away from the C-axis origin czp in the direction of arrow C, it outputs a stop signal STI to the spindle drive motor 3c indicated by the first VM. In response to this, the spindle drive motor 3c stops rotating in the directions of arrows C and D, and as a result, the spindle 3a stops rotating in the directions of arrows C and D together with the workpiece 36, and the spindle 3a stops rotating in the directions of arrows C and D. is positioned at the MCP. In addition, as the delivery position CP, c@R is set (in other words, when α=0)
It is also possible to choose.

Further, the main control section 12 shown in FIG. 1 instructs the C-axis control section 22 to position the spindle 5a at the delivery position CP (see FIG. 12).

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 amount of rotation angle obtained, the position of the spindle 5a in the directions of arrows C and D with respect to c@origin czp shown in FIG.
The rotation of the spindle drive motor 5c is stopped when the reference position esP2 is positioned at the transfer position mcp, which is a predetermined angle α away from the Jl origin CZP in the direction of arrow C. Then, the spindle 5a is The rotation in the D direction is stopped and the device is positioned at the delivery position CP.

In this way, each M of the spindles 3a and 5a, the city position [SPl
, SF3 are respectively positioned at the delivery position ICP, loosen the chuck 5b attached to the spindle 5a shown in Figure 5, and in that state move the headstock 5 together with the spindle 5a in the direction of arrow A in Figure 5. The spindle 5a and the spindle 3a are brought close to each other, and in this state, the portion of the workpiece 36 that has undergone the first step is inserted into the chuck Sb. In this state, the chuck 5b is abandoned and the workpiece 36 is held by the chucks 3b-5b.

When the workpiece 36 is held by the chucks 3b and 5b, the holding relationship between the workpiece 36 and the chuck 3b is released, and the headstock 5 is moved in this state.

With the chuck 5b holding the workpiece 36, arrow B
The spindles 3a and 5a are separated by moving a predetermined distance in the direction, that is, in the direction away from the headstock 3. Then, the workpiece 36 is moved from the spindle 3a side to the spindle 5.
It will be transferred to the a side via the chuck 5b. Note that this work 36 is transferred to the spindle 3a.

5a are positioned at respective predetermined transfer positions C)), and the workpiece 36 is directly held by the chuck 5b attached to the spindle 5a. There is no phase shift with respect to CZP.

In this way, the work 36 has completed the first step.

When the workpiece 3 has been transferred to the spindle 3a side,
6, the workpiece 36 is processed in the second step, and the unprocessed workpiece 36 is mounted on the spindle 3a side via the chuck 3b. The workpiece 36 is processed in the first step described above.

That is, the main control section 12 shown in FIG.
Then, the spindle 5a is instructed to rotate in the direction of arrow C at a predetermined rotational speed NB.

Then, the rotation speed control section 25 controls the spindle drive motor 5.
c is rotated together with the spindle 5a in the direction of arrow C.

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 the IT diagram also drives the feed drive motor control section 20 to rotate the drive screw 11 in the direction of arrow E or F, and rotate the headstock 5 in the direction of arrow A or F through the nut 5e. Move in direction B (Z-axis direction). At this time, the feed drive motor control section 20 detects the amount of movement of the headstock 5 via the transducer 9a, and based on the detected amount of movement.

Controls the drive motor 9. Furthermore, the main control section 12 drives the tool post control section 40 to appropriately move the tool post 27 shown in FIG. 29, the outer diameter portion of the workpiece 36 is turned into a predetermined shape.

Furthermore, for the unprocessed workpiece 36 held by the chuck 3b shown in FIG.
direction) as appropriate.

The tool rest 26 is appropriately moved and driven together with the turning tool 29 in the directions of arrows G and H (Xi11 direction) to perform a predetermined turning process.

In this way, each outer diameter portion of these workpieces 36, 36 is
1! ! As shown in , after each nine-turning process is completed, the tool rest 26.27 is moved and retracted from the workpiece 36°36 in the direction of arrow G, and in this state, the inner diameter turning tool mounted on the tool rest 26.27 is removed. The tool rest 26.27 is positioned at the zero order to position the tool 29.29 at a position facing each workpiece 36.
, respectively, by a predetermined distance in the direction of arrow H in Fig. 8.

A tool 29 for internal turning is placed on each unprocessed workpiece 36.
The right end surface in the figure is opposed to the left end surface in the figure of the workpiece 36 that has completed the first process, and in this state, move the headstock 3°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 step are processed into a predetermined shape. After the machining, move the headstock 3 in the direction of the arrow.

Move the headstock 5 appropriately in the direction of arrow B, and move the tool rest 26.
Each tool 29 attached to 27 is taken out from each inner diameter part,
In this state, the tool rests 26 and 27 are moved in the direction of arrow G to retreat from the workpiece 36 and the like.

Further, the rotation of the chucks 3b and Sb in the direction of arrow C is stopped.

Next, in this state, the first process completed wire 36 held by the chuck 5b shown in FIG. Drilling with 0-axis control is performed using the .

That is, the main control section 12 shown in FIG. 1 drives the CM control section 22 to drive the spindle drive motor 5C.
Rotate at low speed in the direction of the arrow. Then, the reference position SP2 of the spindle 5a shown in FIG. 12 also rotates in the direction of the arrow, and the reference position [SF3] coincides with the C-axis origin CZP.

An origin detection signal oS2 is output from the transducer 5d shown in FIG. 1 to the C-axis control section 22. Note that the reference position [SF3 of the spindle 5a is C as shown in FIG.
At the time when the Mg point CZP coincides with the grooves 36a and 36b drilled on the workpiece 3 during the first process,
As shown by the broken line in Fig. 12, C@JM point CZ
Rotation angle amount θ1. from I' in the direction of the arrow. (θ1002)
located at a distance. Furthermore, clJ! 11 control unit 22.

From the time when the origin detection signal OS2 is input, when the rotation angle and degree of the spindle 5a in the direction of the arrow detected via the transducer 5d reach a predetermined angle θ3,
Stop the spindle drive motor 5c.

Then, the spindle 5a moves to its reference position Il! SP2 is at a predetermined angle θ3 from the C-axis origin CZP in the direction of the arrow in Figure 12.
It will be positioned in an elegant position.

Next, in this state, install the tool rest 27 shown in FIG.

While rotating a drilling tool 29 such as a drill, move it a predetermined distance in the direction of arrow H toward the workpiece 36,
Further, the headstock 5 is moved and driven in the direction of arrow A as appropriate. Then, the workpiece 36 is moved to the spindle 3a as described above.
(After the first process is done in II!, the spindle 3
(Since the workpiece 36 is being transferred, holes 36c are formed in the workpiece 36 from the grooves 36a and 36b indicated by broken lines in FIG. 12, which were provided in the q direction in the first step.)

Predetermined angles θ3 and (θ2+0
3) are separated from each other by a through-hole.

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 removed from the chuck 5b.
is discharged to the work catcher 37 in the lower part of FIG. In parallel, the workpiece 36 held by the chuck 3b shown in FIG. A milling process is performed to form grooves 36a and 36b shown in FIG. 1-1 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 the embodiment described above, when transferring the workpiece 36 from the spindle 3a@ to the spindle 5a, the headstock 5 is moved together with the spindle 5a in the direction of the arrow toward the spindle 3a of the headstock 3. , the case where the workpiece 36 is delivered has been described. But what about the delivery method?

However, the present invention is not limited to this, and the headstock 3.5 is relative to arrow A.

By moving the spindles 3a and 5a in the B direction (Z-axis direction), the workpiece 36 is brought close to each other.
Any method may be used as long as the transfer can be carried out6. For example, by moving the headstock 3 together with the spindle 3a in the direction of arrow B toward the spindle 5d,
It may also be transferred from the spindle 3a side to the spindle 5a side.

Further, by moving the headstock 3 in the direction of arrow B and the headstock 5 in the direction of arrow A, the spindles 3a and 5a may be brought close to each other, and the workpiece 36 may be transferred in this state.

Note that in the embodiment described above, the work transfer program WT stored in the system program memory 16
Based on P, spindle 3a.

Although the case where the workpiece is transferred between the spindles Sa has been described, any method may be used to transfer the workpiece as long as the amount of the workpiece 36 can be transferred directly between the spindles 3a and 5a.

For example, the Canadian program memory 15 may store a Canadian program PRO created including the contents of the work transfer program WTP, and the work transfer operation may be performed based on the Canadian program PRO. Of course.

(g) 0 Effects of the Invention As described above, according to the present invention, the workpiece 36 is held on the first spindle (for example, the spindle 3a),
In this state, the workpiece 36 is processed with C-axis control, and after the processing, the first and second spindles are positioned at a predetermined delivery position CP, and the first and second spindles are The workpiece 36 is held close to each other by the first and second spindles, and in this state, the holding relationship between the workpiece 36 and the first spindle is removed, and further, the first and second spindles are held close to each other. and @2 spindles are separated, the workpiece 36 is held on the second spindle side, and in this state, the workpiece 36 is sealed and predetermined machining with C-axis control is performed. Therefore, the first and second spindles are positioned at the transfer position [CP].

In this state, the workpiece 3 held on the first spindle side
6 can be directly delivered to the second spindle side with its movement on the C-axis restricted.

As a result, the workpiece 36 is moved from the first spindle side to the second spindle side.
The workpiece 36 can be transferred to the spindle side without causing a phase shift with respect to the C-axis origin CZP, and milling or the like involving C-axis control can be performed with high processing accuracy on the transferred workpiece 36.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the processing control method in an opposed spindle lathe according to the present invention. FIG. 3 is 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. 11 is a view of the workpiece in FIG. S in the direction of the Q arrow, and FIG. 12 is a view of the workpiece in the direction of the R arrow in FIG. 9. 1...Opposed spindle lathe 3a...First spindle (spindle) 3b
...Work holding means (chuck) 5a...
・-Second spindle (spindle) 5b...
Work holding means (chuck) 36... Work CP... Delivery position Reijin Yamazaki Mazak Co., Ltd. agent Patent attorney Ai 1) Shinji (and 2 others) Figure 7 Figure 8 Figure 11 Figure CP December 18, 1986

Claims (1)

[Scope of Claims] An opposed spindle lathe having a first spindle and a second spindle facing each other, each of which is provided with a workpiece holding means capable of holding a workpiece, the first spindle having: The workpiece is held, and in this state, the workpiece is processed with C-axis control, and after the processing, the first and second spindles are positioned at predetermined delivery positions, and the first and second spindles are positioned at predetermined transfer positions. the workpiece is held by the first and second spindles by bringing the two spindles closer to each other; next, in this state, the holding relationship between the workpiece and the first spindle is released; The first and second spindles are separated, the workpiece is held on the second spindle side, and in this state, a predetermined machining process involving C-axis control is performed on the workpiece. , a machining control method in opposed spindle lathes.