JPH091402A - Spindle movable automatic lathe - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the work efficiency by shortening the time required from the completion of machining of one spindle to the machining of the other spindle. [Structure] A tool rest 23 installed on the machine base 11 so as to be capable of reciprocating laterally, two main spindles 17a and 17b capable of moving forward and backward with respect to the tool rest, and work supply and work recovery racks 34b and 34a. Work supply and work recovery work mounting means 36b and 36a slidably provided along the work supply and work recovery racks, and one main shaft, the other main shaft, the work supply and work recovery racks The arm rotating shaft 29, which is arranged between the respective end portions of the main shaft of the workpiece, which can move forward and backward, and the unprocessed workpiece mounted on the workpiece mounting workpiece mounting means are transferred to both spindles and mounted on both spindles. The arm 49 fixed to the arm rotation shaft for transferring the processed work to the work collecting work attaching means.
And comprising.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle-moving automatic lathe capable of concurrently performing a work attachment / detachment operation on one of two spindles and a lathe machining operation on the other of the two spindles by an NC mechanism.

[0002]

2. Description of the Related Art Conventionally, as an automatic lathe of this type, there is the one proposed by the present applicant and published in Japanese Patent Application No. 2-90565. As shown in FIG. 5, this conventional automatic lathe has a pair of spindles 2 and 3 mounted on a machine base 1 at predetermined intervals in the left-right direction, and the machine base 1 in front of both spindles 2 and 3 is mounted. A saddle 4 is provided on top of which both spindles 2 and 3 are freely accessible.
On this saddle 4, there is provided a tool rest 6 which is movable in the left-right direction via a lateral feed base 5.

Then, for example, the tool rest 6, which has been machined by one of the spindles 2, moves to the front of the one spindle 2 and separates from the one spindle 2, and further moves to the right to mount an unmachined work. It stops before the other main spindle 3 and further approaches the other main spindle 3 to process the work.

[0004]

However, in such a conventional automatic lathe, when the machining of the one spindle 2 is finished and the machining of the other spindle 3 is finished, the tool rest 6 makes the one spindle 2 one. From the front position of one main spindle 2 to the front position of the other main spindle 3 on which the unworked work is mounted, and the second stroke And the third stroke in which the tool rest 6 approaches the other spindle 3 from the front position of the other spindle 3, so that the maneuverability of the tool rest 6 decreases and one of the spindles 2
There is a problem in that it takes a long time from the completion of the machining of 1 to the machining of the other spindle 3.

Therefore, the present invention has been made in view of the actual situation of such a conventional automatic lathe, and shortens the time from the completion of machining of one spindle to the machining of the other spindle, The purpose is to provide a spindle-moving type automatic lathe with improved workability.

[0006]

In order to achieve the above-mentioned object, the present invention is arranged in parallel with a tool rest installed on a machine base of a lathe so as to be reciprocally movable in the lateral direction at a predetermined distance in the lateral direction. And two spindles that can move forward and backward with respect to the tool post, and are provided above the one spindle, and extend laterally from the vicinity of the one spindle, and the end of the machine base near the one spindle. A work supply rack having one end protruding from the edge, and a work supply rack horizontally provided above the other main shaft, extending laterally from the vicinity of the other main shaft, and projecting one end from the edge of the machine base near the other main shaft. The work collecting rack, the work supplying work attaching means slidably attached in the lateral direction along the work feeding rack, and the slidable side in the lateral direction along the work collecting rack. And the work mounting means for collecting the work One main shaft, the other main shaft, the end of the work supply rack near the main shaft, and the end of the work recovery rack near the main shaft are arranged in parallel with both the main shafts and move forward. Retractable arm rotation shaft and unprocessed workpieces attached to the workpiece supply attachment means are transferred to both spindles, and processed workpieces attached to both spindles are transferred to the workpiece recovery attachment means. An arm fixed to the arm rotation shaft,
It will be equipped with.

Further, the arm is provided with a rod-shaped support portion projecting in a radial direction from the arm rotation shaft, and a work-supplying mounting seat and a workpiece which are protruded to the left and right sides of the rod-shaped support portion within a rotation plane of the rod-shaped support portion. A recovery mounting seat, a chuck is provided on the work supply mounting seat, a suction pad for attaching and detaching the work is provided on the work recovery mounting seat, and the work is provided on the front end faces of the both spindles. And a suction hole for attaching and detaching the work, and the work supplying work attaching means has a suction pad for attaching and detaching the work to the work supplying work attaching member,
The work-recovering work attaching means has a suction pad for attaching and detaching the work to the work-recovering work attaching member.

[0008]

According to the above means, the automatic lathe according to the present invention is N
The C mechanism operates according to the following procedure. The unprocessed work mounted on the work supply attachment means is transferred along the work supply rack to the other end of the work supply rack at the center of the machine base.

Next, the unprocessed work transferred to the other end of the work supply rack is gripped by the chuck of the arm, and then the arm is rotated, for example, rightward to the front position of the one of the main shafts, whereby one of the main shafts is rotated. Be attached to.

Next, the arm that has transferred the unmachined work to one of the main shafts rotates counterclockwise, and the chuck grips the unmachined work at the other end of the above-mentioned work supply rack (hereinafter referred to as "upper vertical position"). Stop at.

Next, after the chuck of the arm grips the unprocessed work newly transferred to the other end of the work supply rack, the arm rotates counterclockwise to the front position of the other spindle and is gripped by the chuck. Attach the unprocessed workpiece to the other spindle.

Then, after the arm rotates rightward and returns to the upper vertical position, the chuck of the arm grips the unprocessed work newly transferred to the other end of the work supply rack in the same manner as described above.

Further, when the arm that has transferred the unworked work to one of the main shafts returns to the upper vertical position, the tool rest moves to the right and stops at the front position of the one main shaft.

Next, one of the spindles, on which the unmachined work is mounted, rotates and advances toward the tool post to perform a predetermined cutting process.

Then, when the cutting work of the unmachined work on one of the spindles is completed, the one spindle is retracted and stopped at a predetermined position.

Next, the tool rest moves to the left and stops at the front position of the other spindle.

Then, the other main shaft on which the unprocessed work is mounted rotates and advances toward the tool rest to perform a predetermined cutting work.

On the other hand, when one of the spindles, which has completed the cutting process, moves backward and stops at a predetermined position, the arm stopped at the upper vertical position rotates clockwise and stops at the front position of one of the spindles.
The processed work is adsorbed by the adsorption pad of the arm. Next, the arm rotates counterclockwise and mounts the unprocessed work held by the chuck of the arm on one of the spindles, and then further rotates counterclockwise to return to the upper vertical position.

Next, the processed workpiece mounted on the arm is mounted on the workpiece collecting mounting means at the other end of the workpiece collecting rack and transferred to one end of the workpiece collecting rack protruding outside the machine base. To be done. At the same time as the transfer of the processed work, a new unprocessed work is attached to the arm.

Such a series of operations is performed, for example, by supplying an unprocessed work to the work supply work attaching means by the work supply means and collecting the processed work from the work collecting work attaching means by the work collecting means. It can be repeated.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a spindle moving automatic lathe according to the present invention. In FIG. 1, 11 is a machine base, and 12 is a headstock mounted on the machine base 11. Two pairs of guide rails 13a and 13b are provided on the upper surface of the headstock 12 and extend in the front-rear direction at predetermined intervals in the lateral direction (left-right direction).

On the pair of left guide rails 13a,
A first main spindle support 15a is provided slidably in the front-rear direction, and a first main spindle 17a extending in the front-rear direction is rotatably provided on the first main spindle support 15a. This first spindle 1
At the rear end of 7a, as shown in FIG.
A first spindle rotation driving servomotor 18a, which is fixed to 5a and rotationally drives the first spindle 17a, is directly connected.

A nut 19a provided with a ball screw is hung vertically on the bottom surface of the first main spindle support 15a.
A screw rod 20a that is screwed into the shaft 9a and extends in the front-rear direction is pivotally supported by the headstock 12, and the rear end of the screw rod 20a is fixed to the headstock 12 to rotate and drive the screw rod 20a. The linear drive servomotor 21a is directly connected. Therefore, when the screw rod 20a is driven to rotate in the forward or reverse direction by the first spindle linear drive servomotor 21a, the first spindle support 15a, that is, the first spindle support 15a via the nut 19a.
The main shaft 17a can be moved forward or backward.

The right side portion of the headstock 12 also has the same structure as the above left side portion. That is, the right side portion of the headstock 12 has a pair of left side guide rails 13.
a, the first main spindle support 15a, the first main spindle 17a, the first main spindle rotational drive servomotor 18a, the first main spindle linear drive servomotor 21a, the nut 19a, and the pair of right guides that are symmetrical to the screw rod 20a. Rail 13b, second main spindle support 15b, second main spindle 17b, second main spindle rotary drive servo motor 18b, second main spindle linear drive servo motor 21.
b, a nut 19b and a screw rod 20b are provided. Therefore, the second main spindle 17b can also perform the same operation as the above-described first main spindle 17a. That is, when the screw rod 20b is normally or reversely rotated by the second spindle linear drive servomotor 21b, the second spindle support 15b, that is, the second spindle 17b can be moved forward or backward via the nut 19b. There is.

As shown in FIGS. 2 and 3, on the upper surface of the machine base 11 in front of the first main spindle 17a and the second main spindle 17b, the first main spindle 17a and the second main spindle 17b are connected via the transverse feed table 22. Is provided with a tool rest 23 that is capable of reciprocating in the lateral direction between the first and second spindles 17a and 17b.
The front end of each of the can be moved forward and backward.

Further, the first spindle 17a and the second spindle 17
A predetermined number of suction holes (not shown) are formed in the front end surface of each of the b.
By attaching to the front end surface of each of the main spindle 17a and the second main spindle 17b, and by releasing the suction state between the front end surface of each of the first main spindle 17a and the second main spindle 17b and the work,
The workpieces attracted to the front end surfaces of the first main spindle 17a and the second main spindle 17b can be removed from the front end surfaces of the first main spindle 17a and the second main spindle 17b, respectively.

On the upper surface of the machine base 11 on the left side of the first main spindle support 15a and the right side of the second main spindle support 15b, the first main spindle 17 is provided.
a and a gantry-shaped pedestal 2 that horizontally extends above the second spindle 17b
4 are erected.

An arm mounting seat 25 is vertically provided at the center of the bottom surface of the beam 24c constituting the frame 24. The guide member 27 is vertically provided, and the arm support 28 is vertically provided on the pair of guide members 27 so as to be slidable in the front-rear direction. As shown in FIG. 2, an arm rotation shaft 29 extending in the front-rear direction is rotatably supported on the arm support body 28, and an arm fixed to the arm support body 28 is fixed to a rear end portion of the arm rotation shaft 29. An arm rotary shaft rotary drive servomotor 30 for rotationally driving the rotary shaft 29 is directly connected.

A nut 31 provided with a ball screw is attached to the arm support 28, and a screw rod 32 screwed to the nut 31 and extending in the front-rear direction is pivotally supported by the arm support 28. At the rear end of the screw rod 32, an arm rotation axis linear drive servomotor 33 fixed to the arm support 28 and rotationally driving the screw rod 32 is directly connected. Therefore, by the arm rotation axis linear drive servo motor 33,
When the screw rod 32 is driven in forward or reverse rotation, the nut 31
The arm support 28, that is, the arm rotation shaft 29 can be moved forward or backward via the.

On the front surface of the upper end portion of the left column 24a forming the pedestal 24, the beam 2 from the center of the beam 24c of the pedestal 24 is provided.
A square pipe-shaped work recovery rack 34a extending to the left along 4c and protruding to the outside of the machine base 11 is fixed.
A block-shaped sliding member 35a slidably supported between the left and right ends thereof is attached to the front surface of the work recovery rack 34a extending in the lateral direction. Is to the right (that is, the beam 24c of the mount 24)
To the center of the) mounting member 3 for projecting rectangular plate
7a is attached.

Further, as shown in FIG. 2, a nut 38a, which protrudes into the rack 34a for recovering the work and is provided with a ball screw, is fixed to the sliding member 35a, and is screwed to the nut 38a to fix the work. The screw rod 39a extending laterally inside the recovery rack 34a is attached to the work recovery rack 34.
The screw rod 39a is pivotally supported on the right end of the screw rod 39a, and the left end of the screw rod 39a is fixed to the work collecting rack 34a.
A workpiece collecting servomotor 40a for rotating and driving 9a is directly connected. Therefore, the work recovery servomotor 40
When the screw rod 39a is normally or reversely rotated by a, the work recovery mounting member 37a moves leftward or rightward between the left and right ends of the work recovery rack 34a via the nut 38a and the sliding member 35a. You can do it.

At the end of the work collecting mounting member 37a protruding rightward from the sliding member 35a, three tubular suction pads 41 protruding forward from the position forming the apex of an equilateral triangle.
a is projected. This suction pad 41a sucks a work and attaches it to the suction pad 41a, and the work sucked by the suction pad 41a lowers the vacuum degree in the suction pad 41a to suck the work.
It can be removed from.

To the sliding member 35a, a bracket 42a having an inverted L-shaped cross section, which is formed by projecting upward from the work collecting rack 34a and bending backward at the upper end thereof, is also fixed. On the upper surface of the rack 34a, there is mounted a guide member 43a having a concave cross section extending from the lateral center to the left end. In this guide member 43a,
A flexible vacuum tube 44a and the like are housed, and the flexible vacuum tube 44a is fixed by the bracket 42a and the right end portion of the guide member 43a, and the end of the vacuum tube 44a is Three suction pads 41a
Connected to In addition, the work recovery mounting member 37a,
The suction pad 41a and the like constitute the work collecting work attaching means 36a.

The right side portion of the beam 24c forming the gantry 24 has the same structure as the left side portion of the beam 24c described above. That is, in the right part of the beam 24c,
The left side work recovery rack 34a and the sliding member 3 described above.
5a, work recovery mounting member 37a, nut 38a, screw rod 39a, work recovery servomotor 40a, tubular suction pad 41a, bracket 42a, guide member 43.
a and the vacuum supply tube 44a, the right side work supply rack 34b, the sliding member 35b, the work supply attachment member 37b, the nut 38b, the screw rod 39b, the work supply servomotor 40a, and the tubular suction pad 41b. A bracket 42b, a guide member 43b and a vacuum tube 44b are provided.

Therefore, the work supplying servomotor 40b
Thus, when the screw rod 39b is normally or reversely rotated, the work recovery mounting member 37b can be moved leftward or rightward between the left and right ends of the work recovery rack 34a via the nut 38b and the sliding member 35b. It is like this. The work supplying attachment member 37b, the suction pad 41b, and the like constitute the work supplying work attaching means 36b.

Further, when the work supply mounting member 37b moves to the left end of the work supply rack 34b, which is the center of the beam 24c, the center point P _{1 of the} equilateral triangle formed by the installation positions of the three suction pads 41b. , Work recovery mounting member 3
When 7a moves to the right end of the work collecting rack 34a, which is the center of the beam 24c of the gantry 24, the center point P ₂ of the equilateral triangle formed by the installation positions of the three suction pads 41a, the first point
The axis P ₃ of the main shaft 17a and the axis P of the second main shaft 17b
₄ is arranged on the circumference X around the axis of the arm rotation shaft 29 in FIG.

At the front end of the arm rotation shaft 29, as shown in FIG. 4, a rod-shaped support portion 45 projecting from its axis in the radial direction of the arm rotation shaft 29, and a rod-shaped support portion within the rotation surface of the rod-shaped support portion 45. A substantially T-shaped arm 49 including a work supply mounting seat 47 and a work recovery mounting seat 48 that project to the left and right of the projecting end of the support portion 45 is fixed. Further, when the work supply mounting seat 47 and the work recovery mounting seat 48 are above the arm rotation shaft 29 and the rod-shaped support portion 45 of the arm 49 is vertical, in FIG. The seat 47 is on the right side (work supply rack 34b
Side), and the work recovery mounting seat 48 is on the left side (work recovery rack 34a side). In the following description, such a position of the arm 49 will be referred to as an “upper vertical position” for the sake of simplicity.

On the rear surface of the work supply mounting seat 47 of the arm 49, an unmachined work is mounted on the first or second main spindle 17a or 1.
In order to mount it accurately on 7b, a chuck 50 that projects rearward and can be opened and closed by pneumatic operation is fixed, and on the rear surface of the work recovery mounting seat 48, it projects rearward from a position forming the apex of an equilateral triangle. Three tubular suction pads 51
Is protruding. The center of the chuck 50 and the center of the equilateral triangle formed by the installation positions of the three suction pads 51 of the arm 49 are arranged on the circumference X in FIG. 1 described above, and the arm 49 is at the upper vertical position. At this time, the center of the chuck 50 of the work supply mounting seat 47 is the center point P ₁ of the three suction pads 41b of the work supply mounting member 37b.
And the center points of the three suction pads 51 of the work collecting mounting seat 48 are located at the center of the work collecting mounting member 37a.
It is arranged to face the center point P ₂ of the three suction pads 41a.

The axial center distance between the first main spindle 17a and the second main spindle 17b is such that when the center of the chuck 50 of the workpiece supply mounting seat 47 is on the axial center line of the first main spindle 17a, the workpiece recovery mounting seat 48 is provided. Are spaced so as not to contact the second main shaft 17b. Reference numeral 52 denotes an operation panel provided on the front surface of the machine base 11, and this operation panel is provided with an operation switch, an NC mechanism and the like.

Next, the operation of the spindle moving type automatic lathe of this embodiment will be described. The operation of the automatic lathe of this embodiment is performed by the NC mechanism according to the following procedure. First, a predetermined state before the work of the automatic lathe according to the present embodiment is started, that is, the work supply mounting member 37b is at the right end of the work supply rack 34b, and the work recovery mounting member 37a is the work recovery rack 34a. At the right end, the arm rotation shaft 29 moves forward, the arm 49 is at the upper vertical position, and the first main spindle 17a and the second main spindle 17b are in the retracted position (hereinafter, such a state will be referred to as " If it is not in the "initial state"), when the operation switch is turned on, the respective parts of the automatic lathe are moved to the above-mentioned positions to be in the initial state.

When the automatic lathe is in the initial state, the unprocessed work placed on the work supply table (not shown) is conveyed by the work supply means (not shown) to the work supply mounting member 37b of the work supply rack 34b. , Suction pad 41
Adsorbed on b. Next, the workpiece supply mounting member 37b that has adsorbed the unprocessed workpiece moves to the left and stops at the left end of the workpiece supply rack 34b.

Next, the arm 49 retracts, and the chuck 50 of the work supply mounting seat 47 grips the unprocessed work adsorbed by the work supply mounting member 37b. At this time, the degree of vacuum inside the suction pad 41b of the work supply mounting member 37b is lowered, and the suction state between the suction pad 41b and the unprocessed work is released.

Next, the arm 49 holding the unprocessed work
Moves forward and stops at a predetermined position away from the suction pad 41b. At this time, the work supply attachment member 37b moves to the right end of the work supply rack 34b.

Next, the arm 4 holding the unprocessed work
9 rotates right and stops at a position in front of the second main spindle 17b, and then moves backward to bring the unworked workpiece into contact with the front end surface of the second main spindle 17b. At this time, the front end surface of the second spindle 17b adsorbs the unprocessed work, the chuck 50 holding the unprocessed work opens, and the unprocessed work is released from the chuck 50.

Next, after the arm 49 moves forward and stops at a predetermined position, it rotates counterclockwise to return to the upper vertical position, and the tool rest 23 moves rightward and stops at the front position of the second main spindle 17b. , The second main spindle 17b rotates.

Next, the rotating second spindle 17b is advanced to bring the unmachined work into contact with the tool mounted on the tool rest 23 to perform a predetermined cutting process.

On the other hand, the arm 49 returned to the upper vertical position.
The chuck 50 newly grips an unprocessed work placed on a work supply table (not shown) by the same process as described above.

Next, the arm 49 newly gripping the unmachined work rotates counterclockwise and stops at the front position of the first main spindle 17a, and then retreats to bring the non-machined work into contact with the front end surface of the first main spindle 17a. At this time, the front end surface of the first main spindle 17a adsorbs the unprocessed work, and the chuck 50 holding the unprocessed work opens and the unprocessed work is chucked by the chuck 50.
Release from.

Next, the arm 49 advances to move the first spindle 1
After stopping at a predetermined position in front of 7a, it rotates right and returns to the upper vertical position.

Then, the chuck 50 of the arm 49 newly grips the unprocessed work placed on the work supply table (not shown) by the same process as described above.

Next, when the cutting of the unmachined work on the second spindle is completed, the second spindle retreats to a predetermined position, and then the arm 49 holding the new unmachined work rotates to the right from the upper vertical position. The work collecting mounting seat 48 of 49 stops at the front position of the second main spindle 17b.

Next, the arm 49 is retracted, and the arm 49
The suction pad 51 of the work recovery mounting seat 48 comes into contact with the processed work of the second main spindle 17b to adsorb the processed work. At this time, the degree of vacuum of the suction hole on the front end surface of the second main spindle 17b is lowered, and the suction state between the front end surface of the second main spindle 17b and the processed work is released.

Next, the arm 4 which adsorbs the processed work
9 moves forward and stops at a predetermined position, and then rotates counterclockwise to attach the workpiece supply mounting seat 47 of the arm 49 holding the unmachined workpiece.
Stops at the front position of the second main shaft 17b.

Then, similarly to the above, after mounting the unmachined work held by the arm 49 on the front end surface of the second main spindle 17b, the arm 49 which adsorbs the machined work rotates to the upper vertical position. Return.

Next, the arm 4 which adsorbs the processed work
9 is retracted, and the processed work is the work collection rack 3
4a Workpiece recovery mounting member 37a suction pad 41a
Is abutted against and adsorbed. At this time, the degree of vacuum in the suction pad 51 of the work recovery mounting member seat 48 of the arm 49 is lowered, and the suction state of the suction pad 51 and the processed work is released.

Simultaneously with the transfer of the processed work to the work recovery mounting member 37a, the chuck 50 of the arm 49 renews the unprocessed work placed on the work supply table (not shown) by the same process as described above. To hold.

Next, when the arm 49 moves forward and stops at the upper vertical position, the work recovery mounting member 37a on which the processed work is mounted moves to the left end of the work recovery rack 34a and stops.

Next, the processed work transferred to the left end of the work recovery rack 34a is conveyed by the work recovery means (not shown) and is transferred to a work recovery table (not shown) installed at a predetermined position. Collected on. Next, the work recovery mounting member 37a that has transferred the processed work to the work recovery means moves to the right and returns to the right end of the work recovery rack 34a.

When the cutting work of the unworked work of the second main spindle 17b is completed and the second main spindle 17b retreats to a predetermined position, the tool rest 23 moves leftward to move the first main spindle 17b.
After stopping at the front position of a, the first main spindle 17a rotates.

Then, the rotating first spindle 17a is advanced to bring the unmachined work into contact with the tool mounted on the tool rest 23 to perform a predetermined cutting process.

Next, when the cutting of the unmachined work of the first spindle 17a is completed, the first spindle 17a retracts to a predetermined position, and then the arm 49 holding the unmachined workpiece rotates leftward from the upper vertical position, and the arm 49 The work recovery mounting seat 48 of 49 stops at the front position of the first main spindle 17a.

Then, similarly to the above, after the suction pad 51 of the arm 49 sucks the processed work of the first spindle 17a, the arm 49 rotates counterclockwise and the unprocessed work held by the arm 49 is moved to the first spindle. It is attached to the front end face of 17a.

Then, similarly to the above, the arm 49 on which the machined work is mounted rotates rightward and stops at the upper vertical position, and then the machined work is transferred to the work recovery mounting member 37a of the work recovery rack 34a. At the same time, a new unprocessed work is mounted from the work supply mounting member 37b of the work supply rack 34b.

On the other hand, when the cutting work of the unprocessed work of the first main spindle 17a is completed and the first main spindle 17a retreats to a predetermined position, the tool rest 23 moves to the right and the second main spindle 1 moves.
Stop in front of 7b.

Then, similarly to the above, the second main spindle 17b rotates, advances toward the tool rest 23, and the unworked work is cut.

Thereafter, a series of operations are repeated in the same manner. By such a repetitive operation, the unprocessed work placed on the work supply table is automatically subjected to predetermined cutting processing one after another and collected in the work recovery table.

As described above, in the automatic lathe of this embodiment, when the tool rest 23 completes the cutting work of the workpiece mounted on one of the spindles, the automatic lathe moves to the front position of the other spindle that has already sucked the workpiece and moves to the other side. Since the workpiece mounted on the spindle can be cut, the waiting time for mounting the workpiece on the spindle becomes zero, and the working efficiency can be significantly improved.

Further, in addition to the above, in the present embodiment, when the cutting work of the work attached to one main spindle is completed and the cutting work of the work attached to the other main spindle is performed, both main spindles 17
Since a and 17b are moved forward and backward with respect to the tool rest 23, and the tool rest 23 is only reciprocally moved in the lateral direction between the two spindles 17a and 17b, compared to the conventional example, one of the spindles can be cut. The time required from the end to the start of cutting of the other spindle is shortened, further than the conventional example,
Work efficiency can be improved.

Further, in the conventional example, the tool rest 6 has the spindles 2, 3
Since it can move forward and backward with respect to the work piece, the saddle 4 enters below the spindles 2 and 3 when the work piece is machined, and the work pieces are piled up on the saddle 4, and the lathe becomes dirty and cluttered with the work piece chips. There was a problem that it would end up. On the other hand, in the present embodiment, the first and second spindles 17a and 17b mounted with the work are brought close to the tool rest 23. There is no possibility of the automatic lathe breaking down due to chips, which in turn makes it possible to improve the safety of workers.

In this embodiment, the screw rod 39b screwed into the nut 38b is rotationally driven by the work supplying servomotor 40b to reciprocate the work supplying mounting member 37b along the work supplying rack 34b. However, the invention is not limited to this, and the work supply mounting member 37b can be reciprocally moved along the work supply rack 34b using an air cylinder or a hydraulic cylinder. Further, the work recovery mounting member 37a can also be reciprocated along the work recovery rack 34a by using an air cylinder or a hydraulic cylinder, similarly to the work supply mounting member 37b.

[0071]

As described above, according to the present invention, when the cutting work of the work attached to one of the main spindles is completed and the cutting work of the work attached to the other of the main spindles is performed, the two spindles are attached to the tool post. In contrast to the conventional example, after finishing the machining of one spindle, the tool post is moved back and forth, so that the tool rest can only be reciprocated laterally between the two spindles. The time required to start work can be shortened, and the work efficiency can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a spindle moving automatic lathe according to the present invention.

FIG. 2 is a partially cutaway plan view of the spindle moving automatic lathe shown in FIG.

3 is a side view of the spindle-moving automatic lathe shown in FIG. 1, showing a state in which a first spindle is advanced with respect to a tool rest and an arm is in an upper vertical position.

FIG. 4 is a view taken along the line AA of FIG. 3;

FIG. 5 is a plan view showing an example of a conventional automatic lathe.

[Explanation of symbols]

 11 machine base 12 spindle headstock 17a 1st spindle 17b 2nd spindle 18a 1st spindle rotation drive servo motor 18b 2nd spindle rotation drive servo motor 19a, 19b, 31, 38a, 38b nut 20a, 20b, 32, 39a, 39b Screw rod 21a 1st main-axis linear drive servo motor 21b 2nd main-axis linear drive servo motor 23 Turret stand 24 mount 29 Arm rotary shaft 30 Arm rotary shaft rotary drive servo motor 33 Arm rotary shaft linear drive servo motor 34a Work Recovery rack 34b Work supply rack 36a Work recovery work mounting means 36b Work supply work mounting means 37a Work recovery mounting member 37b Work supply mounting member 40a Work recovery servo motor 40b Work supply servo motor 41a, 41b, 51 Adsorption pad De 45 rod-shaped support portion 47 a work feeding attachment seat 48 work collecting attachment seat 49 arm 50 chuck 52 pendant

Claims (2)

[Claims] 1. A tool rest installed on a machine base of a lathe so as to be reciprocally movable in the lateral direction, and two spindles arranged in parallel at a predetermined distance in the lateral direction and capable of advancing and retracting with respect to the tool rest. And a work supply rack that is laterally provided above the one main spindle, extends laterally from the vicinity of the one main spindle, and projects one end from an end edge of the machine base near the one main spindle, and the other one. A work recovery rack that is provided above the main shaft and that extends laterally from the vicinity of the other main shaft and projects one end from the edge of the machine base near the other main shaft, and along the work supply rack. Work supply work attachment means attached slidably in the lateral direction, work collection work attachment means attached slidably in the lateral direction along the work collection rack, the one spindle, the The other spindle for supplying the work Between the end of the rack near the main shaft and the end of the work recovery rack near the main shaft, the arm rotation shaft is arranged in parallel with the both main shafts and is movable forward and backward; and the work supply mount. An unfixed workpiece attached to the means is transferred to the both spindles, and further, the processed workpiece attached to the spindles is transferred to the workpiece collecting attachment means, and an arm fixed to the arm rotating shaft, A spindle moving automatic lathe, characterized in that an NC mechanism enables a work attachment / detachment operation on one of the two spindles and a lathe machining operation on the other of the two spindles to be performed in parallel. 2. The arm comprises a rod-shaped support portion that extends radially from the arm rotation shaft, a work-supplying mounting seat and a workpiece that protrude to the left and right sides of the rod-shaped support portion within a rotation plane of the rod-shaped support portion. A recovery mounting seat, a chuck is provided on the work supply mounting seat, a suction pad for attaching and detaching the work is provided on the work recovery mounting seat, and a work is provided on the front end faces of the both spindles. And a suction pad for attaching and detaching the work to and from the work supplying work attaching member, wherein the work collecting work attaching means is a work collecting work attaching means. The spindle-moving automatic lathe according to claim 1, wherein the member has a suction pad for attaching and detaching a work.