JPS63300802A - Opposed-spindle lathe - Google Patents

Abstract

PURPOSE:To prevent generation of phase shifting on a C-axis, when a workpiece is delivered, by providing a memory means, in which a workpiece delivery program is stored, while connecting a C-axis control means to a rotary driving means of each spindle further a driving control means to a feed driving means. CONSTITUTION:A lathe, performing machining in the first process holding a workpiece 36 to the first spindle 3a and, after the machining, controlling rotary driving means 3c, 5c by C-axis control means 21, 22 being based on a workpiece delivery program WTP stored in a memory 16, positions spindles 3a, 5a to a delivery position CP. Next the lathe, controlling feed driving means 7, 9 by feed driving control meals 19, 20 and moving the spindles 3a, 5a approaching, holds the workpiece 36 by both the spindles 3a, 5a. And the lathe, releasing the spindle 3a and the workpiece 36 from their holding relation further separating both the spindles 3a, 5a, delivers the workpiece 36 directly to a side of the spindle 5a performing machining in the second process for the workpiece 36.

Description

[Detailed description of the invention] (a), Industrial application field In the present invention, between two spindles facing each other.

The present invention relates to an opposed spindle lathe that can transfer a workpiece without causing a phase shift on the C-axis and perform milling processing with C-axis control.

(b), Prior Art Usually, in an opposed spindle lathe having two spindles facing each other, in order to process a workpiece, the workpiece must be
Workpiece a is attached to one of the spindles via a chuck and processed in the first step. After the first step is completed, workpiece a 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) 2 Problems to be Solved by the Invention However, with this, when a 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 milling or the like involving C-axis control is performed on a workpiece, there is an inconvenience that the accuracy decreases.

In view of the above circumstances, one aspect of the present invention provides that between opposing spindles,
The workpiece can be transferred without causing a phase shift on the C-axis, and after the transfer is completed, milling or the like involving C-axis control can be performed on the workpiece with high processing accuracy. The purpose of the present invention is to provide an opposed spindle lathe.

(d) Means for Solving Problem No. 9 The present invention has first and second spindles (3a, 5a) facing each other and rotatably provided; Rotary drive means (, 3c, 5C) are attached to the spindles (3a, 5a) of No. 2, respectively.
, 5a), and feed drive means (7, 9) to the first and second spindles (3a).

5a) is connected so that it can be driven to move in the Z-axis direction, and the work transfer program (WTP
) is provided, and the rotation drive means (3c, 5c) is provided with a memory means (16) storing the rotation drive means (3c, 5c) based on the work transfer program (WTP).
) to drive and control the first and second spindles (3a
, 5a) to a predetermined transfer position (cp), and furthermore, the workpiece transfer program (w'rp) is connected to the feed drive means (7, 9). The feed drive means (7°9) is driven and controlled based on the first and second spindles (3a, 5a
) to approach and separate from each other a feed drive control means (19
, 20).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in one drawing.

This description is not limited to the description on the drawings.
The same applies to the column "r(e), Effect" below.

(e) 0 effect With the above-described configuration, the present invention performs processing in the first step while holding the workpiece (36) on the first spindle (3a), and after the completion of the first step, the workpiece (36) When transferring from the first spindle (3a) side to the second spindle (5a) side, the C-axis control means (21, 22) rotates the rotational drive means (3c, 5c) to position the first and second spindles (3a, 5a) at the transfer position [(CP).0 Next, the feed drive control means (19, 20) controls the feed drive means (7, 9). ) to bring the first and second spindles (3a, 5a) closer together to move the workpiece (36
) is held by the first and second spindles (3a, 5a), and in that state, the holding relationship between the first spindle (3a) and the workpiece (36) is released, and further, in that state, the first and second The spindles (3a, 5a) are separated and the workpiece (36) is directly delivered to the second spindle (5a), and after the delivery is completed, the workpiece (36) is processed in the second step. It works like this.

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

FIG. 1 is a control block diagram showing an embodiment of the opposed spindle lathe according to the present invention.

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 opposed spindle lathe according to the present invention. FIG. 11 is a view of the workpiece in the direction of arrow Q in FIG. 5.

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 face each other and independently in the directions of arrows A and B (i.e. 24
It is provided in such a way that it can be freely moved and driven in the m+ direction). Spindles 3a and 5a are provided on the headstock 3.5, respectively, so as to be rotatably driven in the directions of arrows C and D, and chucks 3b and 5b are provided on the spindles 3a and 5a, respectively. It is mounted so that it can rotate in any direction. Further, spindle drive motors 3c and 5c are directly connected to the spindles 3a and 5a, respectively.
Spindle drive motor 3c.

5c, each spindle drive motor 3c.

Transducers 3d and 5d are mounted to detect the rotation angle Jl of the spindles 5c in the directions of the arrows C and D (therefore, the amount of rotation angle of the spindles 3a and 5a in the directions of the arrows C and D).

Furthermore, one machine body 2 is provided with a headstock feed drive device 6, as shown in FIG.
It has nuts 3Q, 5e, a feed drive motor 7.9, a drive screw 10.11, etc. That is, at the lower ends of each of the headstocks 3 and 5 in FIG.

Narrows 3e and 5e protrude into the machine body 2 through the guide surface 2a, and are movable in the machine body 2 together with each headstock 3.5 in the directions of arrows A and B (direction Z411). Each of the nuts 313.56 has a female thread (not shown) threaded through the nut 313.56 in the zm direction.The nuts 3e-5e each have a drive screw 10.11. , are screwed together so as to be rotatable in the directions of arrows E and F, and the drive screws 10.11 are respectively connected to feed drive motors 7.9. Transducer 7a for detecting the amount of rotation angle pi in the directions of arrows E and F in 7.9.

9a is installed. By driving the feed drive motors 7.9 and rotating the drive screws 10.11 in the directions of the arrows E and F, the headstock 3.5 is moved in the direction of the arrow A through the nuts 3e and 5e, respectively. Or it is driven to move in the B direction (Z-axis direction).

The opposed spindle g11 also has a main control section 12, as shown in FIG. 1, and the main control section 12 is connected to a computer program memory 15. System program memory 16. Keyboard 17, turret control section 39.40, feed drive motor control section 19.20-
A C-axis control section 21.22, a rotation speed control section 23.25, etc. are connected.

Here, the turret control section 39 is connected to a turret 26 (see FIG. 2), which will be described later, and the turret control section 40 is connected to a turret 27, which will be described later. Further, the feed drive motor 7 and the transducer 7a are connected to the feed drive motor control section 19 shown in FIG. 1, and the feed drive motor 9 and the transducer 9a are connected to the feed drive motor control section 20. Connected.

The C@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 C@ control section 22.

Furthermore, the 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 each include a turret head 26 and a turret head 26.
a, 27a is the arrow 1. It is supported so that it can be rotated freely in the J direction. Note that the turret heads 26a and 27a are equipped with a turning tool such as a cutting tool and a drill, respectively.

A plurality of tools 2 consisting of rotating tools such as milling cutters, etc.
9 is attached in a removable manner.

Since the opposing spindle l12111 has one or more configurations, when processing a work, the work 36 to be processed is first attached to the spindle 3a via the chuck 3b, as shown in FIG.

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 unit 12 shown in FIG. 1 first instructs the rotation speed control unit 23 to rotate the spindle 3a together with the workpiece 36 in the direction of arrow C at a predetermined rotation speed NA set in the cannibal program PRO. The 6-rotation speed control unit 23 is
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
From the spindle drive motor 3c, the spindle 3
Every time a rotates by a predetermined angle, a rotation signal RSI is output to the rotation speed control section 23. Then, the 1 rotation speed control section 23
counts the number of input rotation signals R5I per predetermined time to determine the rotation speed of the spindle 3a, and controls the spindle drive motor 3c so that the rotation speed becomes a predetermined rotation speed NA.

Further, the main control unit 12 shown in FIG.
, so as to move it by a predetermined amount in the B direction (Z-axis direction).
A command is given to the feed drive motor control section J9. Then, the feed drive motor control unit 19 controls the feed drive motor 7 to the drive screw 1.
o in the direction of arrow E or F to move the headstock 3 in the Z-axis direction via the nut 3e. Note that at this time, the transducer 7a attached to the feed drive motor 7
From there, a one-rotation signal R52 is outputted to the feed drive motor control section 19 every predetermined rotation angle of the feed drive motor 7. Then, the feed drive motor control section 19 controls the rotation signal R.
By counting the number of inputs in S2, the arrow A of the headstock 3 is proportional to the rotation angle amount in the arrow E and F directions of the feed drive motor 7.
Detect the amount of movement in the B direction (Z @ force direction, and then
Controls the feed drive motor 7.

Furthermore, the main control section 12 shown in FIG.
Based on the RO, the tool post controller 39 is instructed to select a tool to be used for machining and control the amount of movement of the tool in the X-axis direction. Then.

The tool post control unit 39 rotates the turret head 26a of the tool post 26 shown in FIG. 36, and further move the tool rest 26 along with the turning tool 29 in the directions of arrows G and H (
(X-axis direction) by a predetermined amount, and the tool 29 turns the outer diameter portion of the workpiece 36 into a predetermined shape.

After the outer diameter portion of the workpiece 36 has been turned as shown in FIG. 3, the tool rest control unit 39 moves the tool rest 26 appropriately in the direction of arrow C to retreat from the workpiece 36, and in this state, The turret head 26a of the tool rest 26 is appropriately rotated in the arrow direction or J direction to position the tool 29 for internal turning, such as a drill or boring rebit, to a position facing the workpiece 36.6 Next, in that state. The tool rest 26 is attached to the machine J42.
9 by a predetermined amount in the direction of arrow H in FIG. The inner diameter part of the workpiece 36 is machined. After the machining, the headstock 3 is appropriately moved in the direction of the arrow in FIG. In this state, the rotation of the chuck 3b in the C direction is stopped.

In addition, the tool rest 26 is moved in the direction of arrow C to be evacuated from the workpiece 36 in preparation for the next milling processing instructed by the machine program PRO, and in this state, the milling tool mounted on the tool rest 26 is tool 29, workpiece 36
Position it in a position opposite to.

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 unit 12 shown in FIG. 1 first instructs the cim control unit 21 to move the spindle 3a to the C
Command P to return. In response to this, the C-axis control unit 21 rotates the spindle drive motor 3c shown in FIG. 1 together with the spindle 3a in the direction of arrow C or D at low speed. 3d is the spindle 3 shown in the 111th
When the predetermined reference position [SPl of a] coincides with C@origin czp, the original position detection signal O3I is output to the C-axis control unit 21 shown in FIG. Upon receiving this, the C-axis control unit 21 immediately stops the rotation 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 reference position Hsp1 of the spindle 3a is positioned at point C41IIlyK czp shown in FIG.

Next, the main control unit 12 rotates the feed drive motor 7 in the direction of arrow E or F via the feed drive motor control unit 19 shown in FIG.
, while moving by a predetermined amount in the B direction (Z-axis direction),
The turret control unit 39 is driven to control the turret 26 shown in FIG.
When the milling tool 29 is rotated, it is moved by a predetermined amount in the direction of arrow H (X-axis direction).

A groove 36a is formed in the outer periphery of the workpiece 36 so as to be spaced apart from the ON origin CZP by a predetermined angle θ1 in the direction of the arrow in FIG. Note that once the groove 36a has been bored, the tool rest 26 is appropriately moved in the direction of arrow G to retreat the tool 29 from the workpiece 36.

Next, the main control section 12 outputs a C-axis control signal C8I to the C-axis control section 21 shown in FIG. Then, the C-axis control section 2
1 rotates the spindle drive motor 3C together with the spindle 3a at low speed in the direction of arrow C. Then, a rotation signal RS3 is outputted from the transducer 3d to the C-axis control section 21 every time the spindle drive motor 3c (therefore, the spindle 3a) rotates by a predetermined angle in the direction of arrow C. In response to this, the C-axis control unit 21 outputs a one-rotation signal R53.
Based on the number of inputs, C of the spindle 3a shown in FIG.
The amount of rotation angle with respect to the axis origin CZP is detected, and when the amount of rotation angle reaches a predetermined amount of rotation angle θ2, the rotation of the spindle drive motor 3C in the direction of arrow C is stopped. 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 positioned at a position rotated by a predetermined angle θ2 in the direction of arrow C from the C-axis origin czp.

Next, in this state, the retracted tool rest 26 shown in FIG. , to move and drive in the direction of arrow B as appropriate. Then,
A groove 36b is formed in the outer circumference of the workpiece 36 by the tool 29.
However, as shown in FIG. 11, the groove 36a is drilled at a predetermined angle θ2 away from the previously drilled groove 36a in the direction of the arrow.

In this way, when the milling process etc. are performed on the workpiece 36 and the machining process of the second process is completed, the main control unit 12
The main control unit 12 calls the work transfer program WTP from the system program memory 16 shown in FIG. 1 and executes the work transfer program WTP.
The reference position of the spindle 3a is set in the axis control unit 21! A command is given to align SP1 with the predetermined delivery position icp shown in FIG. In response to this, the C-axis control unit 21 shown in FIG. 1 drives the spindle drive motor 3c to slowly rotate the spindle 3a together with the workpiece 36 in the direction of arrow C. Then, the transducer 3d outputs a rotation signal R84 to the C@control unit 21 every time the spindle drive motor 3c rotates by a predetermined angle.

Then, the C-axis control unit 21 controls the spindle drive motor 3c (therefore, based on the rotation signal R54).

The position of the spindle 3a) with respect to the cnyx point CZP shown in FIG. 11 is determined, and the reference position i! of the spindle 3a is determined. sP1
is positioned at a delivery position CP that is a predetermined angle α away from the cm origin czp in the direction of arrow C, and outputs a stop signal STI to the spindle drive motor 3c shown in FIG. Then.

In response to this, the spindle drive motor 3c stops rotating in the direction of arrow C, and as a result, the spindle 3a moves toward the workpiece 3.
6, the rotation in the direction of arrow C is stopped, and the spindle 3
a will be positioned at the delivery position 1i1cP. Note that the transfer position 1tYcP can be set at any position with respect to C@origin C7P. For example, it is also possible to set C@origin CZP as the transfer position CP.

Further, the main control section 12 shown in FIG. 1 instructs the csPA control section 22 to position the spindle 5a at the transfer position based on the transfer program WTP. Then,
In response to this, the C-axis control unit 22 rotates the spindle drive motor 5c along with the spindle 5a at low speed in the direction of arrow C or D, and detects the amount of rotation angle of the motor 5c via the transducer 5d. Then, the C-axis control section 22
calculates the position of the spindle 5a with respect to C@origin czp (see Fig. 12) from the detected rotation angle amount, and determines the position of the spindle 5a with respect to C@origin CZP.
A delivery position C separated by a predetermined angle α in the direction of arrow C from
When the spindle drive motor 5c is positioned at P, the spindle drive motor 5c
to stop. Then.

The spindle 5a stops rotating in the direction of arrow C or D together with the workpiece 36, and is positioned at the delivery position CP.

In this way, each reference position of spindles 3a and 5a! SP1,
When the SFs 3 are positioned at the respective transfer positions cp, loosen the chuck 5b attached to the spindle 5a shown in FIG. The rotation is controlled based on the WTP, and the headstock 5 is moved together with the spindle 5a in the direction of arrow A in FIG. It is fitted into the chuck 5b. In this state, tighten the chuck 5b and
is held by the chucks 3b and 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 in this state, the feed shaft drive motor control unit 20 With the workpiece 36 held by the chuck 5b, the headstock 5 is moved a predetermined distance in the direction of arrow B, that is, in the direction away from the headstock;
alienate. Then, the workpiece 36 is moved to the spindle 3a
side to the spindle 3a side. In addition, the work of transferring this work 36 is as follows.

Each reference position fisP1. of the spindles 3a, 5a. SP2 is positioned at the delivery position CP, and the workpiece 36 is directly held in this state 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 work transfer program WTP is transferred to the spindle 5a side, execution of the work transfer program WTP is completed.

Therefore, the second process is performed on the workpiece 36 based on the nitrogram PRO, and the spindle 3a
An unprocessed workpiece 36 is mounted on the side via a chuck 3b, and the unprocessed workpiece 36 is processed in the first step described above.

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

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 one-rotation speed control unit 25 detects the rotation angle amount of the spindle drive motor 5C in the direction of arrow C via the transducer 5d, and adjusts the rotation speed of the spindle 5a to a predetermined value based on the detected rotation angle amount. The spindle drive motor 5c is controlled so that the rotational speed does not vary from NB.

The main control section 12 shown in FIG. 1 also drives the feed drive motor control section 20 to control the feed drive motor 9 to
At the same time, the headstock 5 is rotated in the direction of arrow E or F to move the headstock 5 by a predetermined amount in the direction of arrow A or B (Z-axis direction) via the nut 5e.

At this time, the feed drive motor control unit 20 detects the rotation angle amount of the feed drive motor 9 in the arrow E or F direction via the transducer 7a, and adjusts the Z of the headstock 5 based on the rotation angle amount. Controls the amount of axial movement.

Furthermore, the main control section 12 drives the tool post control section 40,
The turret head 27a of the tool post 27 shown in FIG. 7 is rotated by a predetermined angle in the direction of the arrow or J, and the tool 29 for outer diameter turning, as instructed by the machining program PRO, is placed in a position facing the workpiece 36. After positioning, the tool rest 27 is moved along with the turning tool 29 in the directions of arrows G and H (X-axis direction).
By moving the workpiece 36 by a predetermined amount, the outer diameter portion of the workpiece 36 is turned into a predetermined shape.

On the other hand, as for the unprocessed workpiece 36 held by the chuck 3b shown on the left side of FIG. 7, the spindle 3a is rotated in the direction of arrow C together with the fE workpiece 36, and of.

move the tool post 26 along with the turning tool 29 in the directions of arrows G and H (
Turning is performed by appropriately moving and driving in the X-axis direction).

In this way, each outer diameter portion of these workpieces 36, 36 is
As shown in the figure, after each 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 tool 29.29 for each workpiece 36
The turret 26.2 is positioned opposite to the 0th order.
7.

Each is fed a predetermined distance in the direction of arrow H in Fig. 8,
Each tool 29 for internal turning is attached to an unprocessed workpiece 3.
The right end surface in the figure of 6 is opposed to the left end surface in the figure of the workpiece 36 that has undergone the first process, and in this state, the headstock 3.5 is moved by a predetermined amount in the directions of arrows A and B (Z-axis direction), respectively. These are the unprocessed workpiece 36 and the workpiece 36 that has undergone the first process.
Each inner diameter portion is processed into a predetermined shape. After the processing, the headstock 3 is appropriately moved in the direction of arrow A, and the headstock 5 is moved in the direction of arrow B, so that each tool 29 attached to the tool rest 26, 27 is taken out from each inner diameter portion, and the In the state.

Move the tool rest 26 and 27 in the direction of arrow G to remove the workpiece 36.
evacuate from etc. Further, the rotation of the spindles 3a and 5a in the direction of arrow C is stopped.

Next, the first
For the processed workpiece 36, drilling is performed with C-axis control, that is, the main control unit 12 shown in FIG.
Axis control unit 22 1@! Move, te.

The spindle drive motor 5c is rotated together with the spindle 5a 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 when the reference position SP2 coincides with the CmM point CZP, the first Ii! An origin detection signal O82 is output from the transducer 5d shown in FIG. Note that when the reference position @SP2 of the spindle 5a coincides with the C-axis origin CZP as shown in FIG.
are respectively at the C-axis origin C, as shown by the broken line in FIG.
Rotation angle amount θ1 from ZP in the direction of the arrow. (01+02)
located at a distance.

Further, the C@ control unit 22 controls the spindle when the rotation angle amount of the spindle 5a in the direction of the arrow detected via the transducer 5d reaches a predetermined angle θ3 from the time when the origin detection signal OS2 is manually input. Stop the drive motor 5c.

Then, spindle 5a was ranked 1st in that Ju! SP2 is C
It is positioned at a position separated from the origin C7P by a predetermined angle θ3 in the direction of the arrow in FIG.

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

While the drilling tool 29, such as a drill, is being rotated, it is moved a predetermined distance in the direction of arrow I toward the workpiece 36, and the headstock 5 is further driven to move in the direction of arrow A as appropriate.

Then, the workpiece 36 is moved to the spindle 3 as described above.
After the first step is processed on the a side, the workpiece 36 is transferred to the spindle 5a side without any phase shift, so the hole 36c is formed in the workpiece 36 in the first step. From the grooves 36a and 36b indicated by broken lines in Figure 12,
Predetermined angle θ3 accurately in the direction of arrow C, respectively. (θ2+0
3) are separated from each other by a through-hole.

In this way, when the second process is completed by performing drilling etc. with C-axis control on the workpiece 36 held by the chuck 5b shown in FIG. 9, the chuck 5b is loosened and the machined workpiece is 36 is removed from the chuck 5b, and the workpiece 3G is released into the workpiece catcher 37 at the bottom of FIG. In parallel, the workpiece 36 held by the chuck 3b shown in FIG. A milling process is performed with grooves 36a and 3 shown in FIG. 11 in the workpiece 36.
6b. thus.

By performing the first step and the second step in parallel, the workpiece 36 is continuously processed.

In the embodiment described above, when transferring the workpiece 36 from the spindle 5a side to the spindle 5a side, the headstock 5 is moved along with the spindle 5a in the direction of the arrow toward the spindle 3a of the headstock 3. Move the work 36
We have discussed the case where the transfer of However, the delivery method is not limited to this, and by relatively moving the headstock 3.5 in the directions of arrows A and B (Z-axis direction),
Any method may be used as long as it is possible to bring the spindles 3a and 5a close to each other and transfer the work 36 in that state. For example, by moving the headstock 3 together with the spindle 3a in the direction of arrow B in FIG. 5 toward the spindle 5a.

The workpiece 36 may be transferred to the spindle 5a side by bringing the spindle 3a and the spindle 5a closer together, or by moving the headstock 3 in the direction of arrow B and the headstock 5 in the direction of the arrow. , spindle 3a
, 5a may be brought close to each other and the workpiece 36 may be transferred in this state.

(g) 0 Effects of the Invention As described above, according to the present invention, the first and second spindles facing each other and rotatably provided (for example, the first spindle is connected to the spindle 3a, the second spindle is The spindle is referred to as a spindle 5a.), and the first and second spindles each have a spindle drive motor:
A rotation drive means such as 3c and 5c is connected so as to be able to rotationally drive the spindle, and a feed drive motor 7.
A feed drive means such as 9 is connected to move at least one of the first and second sliders in the Z-axis direction, and a system program memory 16 or the like storing a work transfer program WTP is connected. Memory means is provided in the rotational drive means.

a C-axis control section 21 that controls the rotation drive means based on the work transfer program WTP to position the first and second spindles at predetermined transfer positions;
22 or the like, and further controls the feed drive means based on the work transfer program WTP to cause the first and second spindles to approach and separate from each other. Since the feed drive control means such as the feed drive motor control unit 19 and 20 are connected to each other, the workpiece 36 held by the first spindle can be positioned at a predetermined transfer position between the first and second spindles. In this state, it can be directly held on the second spindle and transferred without using a handling robot or the like. As a result, the workpiece 36 is removed from the first spindle side.

After the transfer is completed, it is transferred to the second spindle without causing any phase shift on the C-axis.

It becomes possible to perform milling processing or the like with C-axis control on the workpiece 36 with high processing accuracy.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram showing an embodiment of the opposed spindle lathe according to the present invention, and FIG. 2 is a plan view of the opposed spindle lathe shown in FIG. 1. Figures 3 to 10 are diagrams showing how a workpiece is machined using an embodiment of the opposed spindle lathe according to the present invention, Figure 11 is a view of the workpiece in the 5th position in the direction of arrow Q, and Figure 12 is , is a view taken along arrow R of the workpiece in FIG. 9; 1...Opposed spindle lathe 3a...First spindle (spindle) 3G
, 5c... Rotation drive means (spindle drive motor) 5a... Second spindle (spindle) 7.
9...Feed drive means (feed drive motor) 16.
...Memory means (system program memory) 19.2o...Feed control drive means (feed drive motor control section) 21.22...C-axis control means (C-axis control section) )W
TP...Work delivery program CP...
...Delivery position Applicant Yamazaki Mazak Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 2 others) December 18, 1988 1 Indication of the case 1988 Patent Application No. 134151 2 Name of the invention Opposed spindle lathe 3. Relationship with the case of the person making the amendment Patent applicant address: 1 No. 1, Oaza and Koro, Oro-cho, Niwa-gun, Aichi Prefecture Name (
Name) Yamazaki Mazak Co., Ltd. Representative Teruyuki Yamazaki 4 Agent Address 3-12-21 Shimoai, Shinjuku-ku, Tokyo 161
No. 1, No. 5, Subject of amendment, -77 Specification, "Detailed Description of the Invention" column (1) 4 Between lines 13 and 14 on page 27 of the specification, the following Insert the text. [Note that by rotating the spindles 3a and 5a of the headstock 3.5 in the directions of arrows C and D, respectively,
5a each reference position SP1. SP2, each 11th
The workpiece 36 is positioned at the transfer positions V1cp and cp shown in the figure and FIG.
It is possible to vary the C#1 values α and α for the llI origin c z p , respectively. Therefore, when the reference positions 1SP1.8P2 of the spindles 3a and 5a are positioned at the respective delivery positions cp and cp, so that the C@ coordinate values of the winter melon (not shown) on the chucks 3b and 5b do not match. By setting the C-axis coordinate values α and α of the transfer positions 1tcp and cp, even if the workpiece 36 to be transferred between the headstocks 3.5 is short in the direction of arrows A and B in FIG. It becomes possible to smoothly transfer the winter melons in the chucks 3b and 5b without interfering with each other. ”

Claims (1)

[Scope of Claims] It has first and second spindles facing each other and rotatably provided, and a rotary driving means is provided on each of the first and second spindles, and the spindle is rotatably driven. and a feed drive means is connected to drive at least one of the spindles to move in the Z-axis direction, and a memory means storing a work transfer program is provided, and the rotation drive means is provided with a memory means storing a work transfer program; C-axis control means is connected to drive and control the rotary drive means to position the first and second spindles at predetermined transfer positions based on the workpiece transfer program; An opposed spindle lathe configured by connecting a feed drive control means for controlling the feed drive means based on a delivery program to cause the first and second spindles to approach and move away from each other.