JP2014155968A - Machine tool and workpiece carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool which has a reduced conveyance cycle by reducing the number of operation times of a workpiece carrier.SOLUTION: An NC lathe 1 includes working means 2 provided with two main shafts 23a and 23b, a workpiece reversion unit 4 for reversing the workpiece and a workpiece carrier 3 for carrying the workpiece. The workpiece reversion unit 4 has two reversion chucks 41a and 41b arranged in the longitudinal direction, and the workpiece carrier 3 has two loader chucks 36a and 36b arranged in the longitudinal direction. The interval between the two reversion chucks 41a and 41b in the longitudinal direction is practically the same as the interval between the two loader chucks 36a and 36b in the longitudinal direction. The configuration allows for simultaneous delivery of the workpiece from the loader chuck 36a to the reversion chuck 41a and reception of the workpiece by the loader chuck 41b from the reversion chuck 41b.

Description

  The present invention relates to a machine tool that sequentially processes a front surface and a back surface of a workpiece, and a workpiece conveyance device used therefor.

  Conventionally, a lathe provided with two spindles has been proposed as a machine tool that sequentially processes the front and back surfaces of a workpiece (see, for example, Patent Document 1). An example of such a conventional machine tool is shown in FIG. A machine tool 201 shown in FIG. 8 includes a workpiece reversing device 204 having two spindles 223a and 223b arranged side by side and two reversing chucks 241a and 241b arranged side by side, and a workpiece. And a work device 232 for carrying the work, the work is processed on the surface in a state of being held by one spindle chuck 225a, and then turned upside down by the work reversing device 204. The back surface is processed while being held by the main spindle chuck 225b, and both surfaces of the workpiece are sequentially processed in this way. The loader head 236 of the transport device 232 has two loader chucks 236a and 236b arranged side by side in the vertical direction, and the loader chucks 236a and 236b are directed downward from the state (the state shown in FIG. 8). It is possible to turn to the state.

  Patent Document 2 discloses a workpiece transfer device having a different configuration. In this workpiece transfer device, two loader chucks are provided on the side surface and the bottom surface of the swivel base, By turning around the center of inclination, the positions of each other can be interchanged.

Japanese Patent Laid-Open No. 2001-9666 JP 2012-110997 A

  Conventionally, the conveyance cycle of the workpiece conveyance device has been shortened by increasing the traveling speed and acceleration of the loader included in the workpiece conveyance device. However, there is a limit to shortening the conveyance cycle by improving the traveling speed and acceleration of the loader.

  Further, in the conventional configuration shown in FIG. 8, when the loader head 236 is turned downward (not shown), the two loader chucks 236a and 236b are arranged in the horizontal direction, so that the loader head 236 is bulky. However, there is a problem that the peripheral device (for example, a cleaning device for cleaning the workpiece after the double-side processing) becomes large. On the other hand, in the workpiece transfer device described in Patent Document 2, there is no problem of increasing the size of the peripheral device due to the bulk of the loader head, but the swivel is swung when the workpiece is transferred to the spindle chuck or the like. Therefore, there is a problem that it takes time to deliver the workpiece as compared with the case where the workpiece conveying apparatus as shown in FIG. 8 is used.

  It is an object of the present invention to perform an operation in which one loader chuck delivers a workpiece to one reversal chuck while the work piece transport device is maintained at a predetermined position, and the other loader chuck receives a work piece from the other reversal chuck. It is to provide a machine tool in which the number of operations of the workpiece transfer device is reduced by performing both operations of receiving a workpiece, thereby shortening the transfer cycle.

  Another object of the present invention is to provide a workpiece transfer device in which one loader chuck is configured to be rotatable with respect to the other loader chuck.

  A machine tool according to a first aspect of the present invention includes machining means having two main shafts, a workpiece reversing device for reversing the workpiece, and a workpiece conveying device for conveying the workpiece. In the machine tool, the workpiece reversing device includes a first reversing chuck and a second reversing chuck arranged in a predetermined direction, and the workpiece conveying device is arranged in the predetermined direction. A first loader chuck and a second loader chuck, and an interval between the first reverse chuck and the second reverse chuck in the predetermined direction is an interval between the first loader chuck and the second loader chuck in the predetermined direction. It is substantially the same.

  The machine tool according to claim 2 of the present invention is configured such that the workpiece transfer device is movable in a lateral direction and a vertical direction, and the first loader chuck delivers the workpiece to the first reversing chuck. The second loader chuck is configured to receive a workpiece from the second reversing chuck, and the first loader chuck to the first reversing chuck in a state where the workpiece transfer device is maintained at a predetermined position. The workpiece is transferred to and the workpiece is received from the second reversing chuck by the second loader chuck.

  According to a third aspect of the present invention, there is provided the machine tool according to the third aspect, wherein the workpiece is transferred from the first loader chuck to the first reverse chuck, and the workpiece from the second reverse chuck by the second loader chuck is transferred. The reception is performed at the same time.

  The machine tool according to claim 4 of the present invention is characterized in that the two main shafts are arranged side by side in the lateral direction, and the first and second loader chucks are arranged side by side in the vertical direction.

  The machine tool according to claim 5 of the present invention is characterized in that the two main shafts are arranged side by side in the horizontal direction, and the first and second reversing chucks are also arranged in the horizontal direction.

  In the machine tool according to claim 6 of the present invention, the first loader chuck is configured to be rotatable relative to the second loader chuck, and a turning center line of the first loader chuck is configured to be the predetermined loader. It is characterized by being perpendicular to the direction and parallel to the chuck surface of the first loader chuck.

  A workpiece transfer device according to a seventh aspect of the present invention is a workpiece transfer device used in a machine tool for processing a workpiece, and includes first and second loader chucks for gripping the workpiece. The first and second loader chucks are arranged side by side in a predetermined direction, and the first loader chuck is configured to be rotatable relative to the second loader chuck. The turning center line is perpendicular to the predetermined direction and parallel to the chuck surface of the first loader chuck.

  According to an eighth aspect of the present invention, there is provided a workpiece transfer device, wherein the first and second loader chucks are pivotally supported, and the first loader chuck is pivoted relative to the support member. And a second turning means for turning the second loader chuck relative to the support member, and a turning center line of the first loader chuck and the second loader chuck The turning center lines are coincident with each other.

  A machine tool according to claim 9 of the present invention is a machine tool comprising processing means for processing a workpiece, and a workpiece transfer device for transferring the workpiece, wherein the workpiece transfer The apparatus is a workpiece transfer apparatus according to claim 7 or 8.

  According to the machine tool of the first aspect of the present invention, the alignment direction of the first and second reversing chucks is the same as the alignment direction of the first and second loader chucks, and the first and second reversing directions are the same. Since the distance between the chucks and the distance between the first and second loader chucks are substantially the same, the second reverse chuck faces the second loader chuck simultaneously with the first reverse chuck facing the first loader chuck. Can be made. Therefore, in a state where the workpiece transfer device is maintained at a predetermined position, the workpiece is transferred from the first loader chuck to the first reversing chuck, and the workpiece from the second reversing chuck by the second loader chuck is transferred. The workpiece can be received at the same time, and the workpiece from the second reversing chuck by the second loader chuck after the workpiece is transferred from the first loader chuck to the first reversing chuck as in the prior art. There is no need to move the workpiece transfer device before receiving the workpiece, and the workpiece transfer cycle can be shortened.

  According to the machine tool of the second aspect of the present invention, the workpiece transfer from the first loader chuck to the first reversing chuck in a state where the workpiece transfer device is maintained at a predetermined position, Since the workpiece is received from the second reversal chuck by the two loader chuck, useless movement of the workpiece conveyance device can be eliminated, thereby shortening the workpiece conveyance cycle.

  According to the machine tool of the third aspect of the present invention, the workpiece is transferred from the first loader chuck to the first reverse chuck, and the workpiece is received from the second reverse chuck by the second loader chuck. Since these operations are performed simultaneously, the workpiece conveyance cycle can be shortened as compared with the conventional configuration in which these operations are performed at different timings.

  In the machine tool according to claim 4 of the present invention, the two main shafts are arranged side by side in the horizontal direction, whereas the first and second loader chucks are arranged side by side in the vertical direction. The lateral width of the loader head including the first and second loader chucks can be reduced, and interference between the first and second loader chucks and various components included in the machine tool can be avoided relatively easily.

  Further, according to the machine tool according to claim 5 of the present invention, since the first and second reversal chucks are arranged side by side, the height dimension of the workpiece reversing device can be suppressed, Compared with a configuration in which the first and second reversing chucks are arranged in the vertical direction, the entire machine tool can be reduced in size.

  According to the machine tool of the sixth aspect of the present invention, the first loader chuck can turn relative to the second loader chuck, and the turning center line of the first loader chuck is in a predetermined direction. Since the first loader chuck is pivoted relative to the second loader chuck, the loader head includes the first and second loader chucks. Can be reduced in size, and the workpiece transfer operation in a relatively narrow space can be facilitated.

  According to the workpiece transfer device of the seventh aspect of the present invention, the first loader chuck can be rotated relative to the second loader chuck, so that the first loader chuck is independent of the second loader chuck. Can be turned. The first and second loader chucks are arranged side by side in a predetermined direction, and the turning center line of the first loader chuck is perpendicular to the predetermined direction and parallel to the chuck surface of the first loader chuck. Therefore, when the first loader chuck is swung, the first loader chuck is folded with respect to the second loader chuck, and the loader head including the first and second loader chucks can be reduced in size, and the loader head is received. The peripheral device can be reduced in size.

  According to the workpiece transfer apparatus of the eighth aspect of the present invention, the first turning means for turning the first loader chuck relative to the support member, and the second loader chuck with respect to the support member. And a second swiveling means for relatively swiveling, so that both the first and second loader chucks can be swung independently of each other, and the state before the first and second loader chucks are swung. In addition, the state can be selectively changed between a state in which only one of the first and second loader chucks is turned and a state in which both the first and second loader chucks are turned. Further, since the turning center line of the first loader chuck coincides with the turning center line of the second loader chuck, both the state before the first and second loader chucks are turned and both the first and second loader chucks are turned. In this state, the relative positional relationship between the first and second loader chucks can be made constant.

  Since the machine tool according to claim 9 of the present invention includes the workpiece transfer apparatus according to claims 7 and 8, the same effect as described above can be obtained.

The perspective view which shows the principal part of the machine tool which concerns on embodiment of this invention. FIG. 2 is a simplified diagram of a loader head included in the machine tool of FIG. 1, where (a) shows a basic state, (b) shows a turning state, and (c) shows a folded state. FIG. 3 is a perspective view of the loader head shown in FIG. 2. The flowchart which shows the workpiece conveyance cycle performed in the machine tool shown in FIG. FIG. 5 is a simplified diagram for explaining the movement of the loader head in the workpiece conveyance cycle shown in FIG. 4. The perspective view which shows a mode that the loader head shown in FIG. 2 is folded and inserted in a peripheral device. The perspective view which shows the modification of the machine tool shown in FIG. The perspective view which shows the principal part of the conventional machine tool. The flowchart which shows the workpiece conveyance cycle performed in the conventional machine tool shown in FIG. FIG. 10 is a simplified diagram for explaining the movement of the loader head in the conventional workpiece conveyance cycle shown in FIG. 9.

  Hereinafter, an embodiment of a machine tool according to the present invention will be described with reference to the accompanying drawings. Referring to FIG. 1, an NC lathe 1 shown as an example of a machine tool includes a processing device 2 as processing means for performing a required processing on a workpiece (not shown), and a workpiece as required. And a workpiece reversing device 4 for reversing the surface of the workpiece.

  The processing apparatus 2 includes a bed main body 21 installed on a floor surface of a factory, two spindle bases 22a and 22b mounted in parallel to the center of the bed main body 21 in the horizontal direction (X-axis direction), and the two main spindles. Two main shafts 23a and 23b rotatably supported on each of the bases 22a and 22b, and two turret type tool rests (hereinafter simply referred to as “turrets”) 24a corresponding to the two main shafts 23a and 23b, respectively. , 24b.

  The two main shafts 23a and 23b extend in the front-rear direction (Z-axis direction), are arranged side by side, and are rotationally driven by a main shaft motor (not shown). Further, spindle chucks 25a and 25b for holding a workpiece are mounted on each of the two spindles 23a and 23b. Each spindle chuck 25a, 25b is driven by a rotating cylinder (not shown) to grip and release the workpiece. On both the left and right sides of the two headstocks 22a and 22b, feed tables 26a and 26b are arranged on the bed main body 21 so as to be movable in the front-rear direction and the horizontal direction. 24a and 24b are mounted so as to be indexable. In the machining apparatus 2, a workpiece held by one spindle chuck (left spindle chuck) 25a is subjected to required machining by a machining tool (not shown) mounted on the corresponding turret 24a. Then, the workpiece gripped by the other spindle chuck (right spindle chuck) 25b is subjected to required machining by a machining tool (not shown) attached to the corresponding turret 24b.

  The workpiece transfer device 3 includes an erection rail 31 installed in the lateral direction above the processing device 2 and a loader 32 supported so as to be movable along the erection rail 31. A traveling platform 33 that moves along the traveling platform 33, a traveling platform 34 that is installed on the traveling platform 33 so as to be movable in the front-rear direction, a lifting rod 35 that can be moved up and down on the traveling platform 34, and a lower end of the lifting rod 35 The loader head 36 is formed. The loader head 36 is provided with two loader chucks 36a and 36b for holding a workpiece in a vertical direction (vertical direction: Y-axis direction), and these two loader chucks 36a and 36b are processed. It is configured to grasp and release an object.

  Referring to FIG. 2, two loader chucks 36a and 36b are supported by a support member 37 so as to be independently rotatable. As a result, the loader head 36 in the present embodiment has the loader chucks 36a and 36b (more precisely, the chuck surfaces 36A and 36B of the loader chucks 36a and 36b) both behind as shown in FIGS. As shown in FIG. 2B, the loader chucks 36a and 36b are both turned and turned downward, and only one loader chuck 36a is turned as shown in FIG. 2C. Thus, the state can be selectively changed so that the loader chuck 36a faces downward and the other loader chuck 36b faces backward.

  More specifically, referring to FIG. 3, the support member 37 has a pair of left and right support members 37a and 37b. One loader chuck (first loader chuck) 36a is connected to the output shaft 40a of the cylinder 39a via a connecting member 38a. The connecting member 38a is connected to the support member 37a and the other loader chuck (via the rotating shaft 41a). The second loader chuck 36b) is configured to be rotatable relative to the second loader chuck 36b). In such a configuration, when the output shaft 40a of the cylinder 39a is retracted upward from the state shown in FIG. 2 (a), the connecting member 38a rotates together with the first loader chuck 36a around the rotating shaft 41a in the clockwise direction in FIG. As a result, the first loader chuck 36a faces downward, and the state shown in FIG. In this state, when the output shaft 40a of the cylinder 39a advances downward, the connecting member 38a turns in the reverse direction, the first loader chuck 36a faces backward, and the state returns to the state of FIG. Here, the rotating shaft 41a extends in the lateral direction, which is perpendicular to the longitudinal direction, which is the direction in which the loader chucks 36a and 36b are arranged, and is parallel to the chuck surface 36A of the loader chuck 36a.

  Similarly, the second loader chuck 36b is connected to the output shaft 40b of the cylinder 39b via a connecting member 38b. The connecting member 38b is connected to the support member 37b and the second loader chuck via a rotating shaft 41b extending in the lateral direction. It is configured to be rotatable relative to 36b. In the state shown in FIG. 2 (c), when the output shaft 40b of the cylinder 39b is retracted upward, the connecting member 38b pivots around the rotary shaft 41b together with the second loader chuck 36b in the clockwise direction in FIG. 2 The loader chuck 36b faces downward, and the state shown in FIG. In this state, when the output shaft 40b of the cylinder 39b advances downward, the connecting member 38b turns in the reverse direction, whereby the second loader chuck 36b faces rearward and returns to the state shown in FIG. The connecting member 38a, the cylinder 39a, and the rotating shaft 41a constitute a first turning means, and the connecting member 38b, the cylinder 39b, and the rotating shaft 41b constitute a second turning means.

  Here, the turning center line of the first loader chuck 36a (axis line of the rotating shaft 41a) and the turning center line of the second loader chuck 36b (axis line of the rotating shaft 41b) coincide with each other, thereby FIG. In the state shown in FIG. 2 and the state shown in FIG. 2B, the relative positions of the two loader chucks 36a and 36b are fixed.

  Referring to FIG. 1, the workpiece reversing device 4 includes a main body (not shown) installed on the lower surface of the installation rail 31 and two reversing chucks 41 a and 41 b supported by the main body. The two reversing chucks 41a and 41b are arranged vertically above the intermediate position between the two main shafts 23a and 23b in the lateral direction, and are configured to grip and release the workpiece. The reversal chucks 41a and 41b can change the posture between a state facing the front and a state facing each other, and the reversal chuck 41b is movable in the vertical direction. In the workpiece reversing device 4, the workpiece is reversed as follows. That is, the two reversing chucks 41a and 41b stand by in a state of being separated from each other and facing the front (standby state), and in this standby state, one reversing chuck (first reversing chuck) 41a is transferred from the loader 32 to the workpiece. Receive. Next, the reverse chucks 41a and 41b are switched to face-to-face postures, and the other reverse chuck (second reverse chuck) 41b descends toward the first reverse chuck 41a and receives the workpiece from the first reverse chuck 41a. When the second reversing chuck 41b is raised to the original position, the reversing chucks 41a and 41b are both returned to the standby state facing the front. As described above, the workpiece is transferred from the first reversing chuck 41a to the second reversing chuck 41b, whereby the workpiece is reversed.

  In the machine tool 1 configured as described above, processing is performed on both surfaces of the workpiece as follows. That is, an unprocessed workpiece (unprocessed workpiece) is held by the second loader chuck 36b and supplied to the left spindle chuck 25a, and one surface (surface) thereof is processed by a processing tool mounted on the turret 24a. The The workpiece (single-side processed workpiece) whose surface has been processed in this way is gripped by the first loader chuck 36a and conveyed to the first reversing chuck 41a of the workpiece reversing device 4 as described above. In this way, the first reverse chuck 41a is transferred to the second reverse chuck 41b to be reversed. The one-side processed workpiece that has been turned upside down is gripped by the second loader chuck 36b and conveyed from the second reversing chuck 41b to the right spindle chuck 25b, and the other side (back side) is processed by a processing tool attached to the turret 24b. Processed. The workpiece that has been processed on both sides in this way (the workpiece that has been processed on both sides) is gripped by the first loader chuck 36a, transported out of the machine from the right spindle chuck 25b, and discharged.

  Here, the distance between the two loader chucks 36a and 36b is equal to the distance between the two reverse chucks 41a and 41b in the standby state, and the arrangement direction of the two loader chucks 36a and 36b and the two reverse chucks 41a. , 41b are both in the vertical direction, the loader head 36 is positioned at a predetermined position facing the workpiece reversing device 4 (reversing device facing position P5 shown in FIG. 5 described later). The loader chuck 36a and the first reverse chuck 41a face each other, and the second loader chuck 36b and the second reverse chuck 41b face each other. Therefore, with the loader head 36 maintained at the reversing device facing position P5, the workpiece is transferred from the first loader chuck 36a to the first reversing chuck 41a, and the second reversing chuck 41b to the second loader chuck 36b. The workpiece can be transferred at the same time.

  Next, the workpiece conveyance cycle of the workpiece conveyance apparatus 3 mentioned above is demonstrated with reference to FIG.4 and FIG.5. Here, in order to facilitate understanding of the invention, two workpieces are respectively held by the two spindle chucks 25a and 25b, and a double-side processed workpiece is held by the first loader chuck 36a. The explanation starts from.

  In this workpiece transfer cycle, the loader head 36 first returns to the origin P1 (step 1). The origin P1 is defined above a supply / discharge device (not shown) arranged on the side of the bed main body 2, for example. Next, the loader head 36 moves to the workpiece supply / discharge position P2, where the double-side processed workpiece gripped by the first loader chuck 36a is transferred to the supply / discharge device, and is also not transferred from the supply / discharge device. The workpiece is received by the second loader chuck 36b (step S2). Thereafter, the loader head 36 passes through the origin P1 (step S3) and moves to the first intermediate position P3 defined above the left main shaft 23a (step S4). Next, the loader head 36 moves to the first main spindle facing position P4 facing the left main spindle chuck 25a, where the workpiece is transferred to and from the left main spindle chuck 25a (step 5). Here, the first loader chuck 36a receives a single-side processed workpiece from the left spindle chuck 25a, and the second loader chuck 36b delivers the unprocessed workpiece to the left spindle chuck 25a. Details will be described later.

  Next, after the loader head 36 moves up to the first intermediate position P3 (step S6), the loader head 36 moves rearward (right diagonally rearward) to the reversing device facing position P5, from the first loader chuck 36a to the first reversing chuck 41a. Simultaneously with the delivery of the one-side processed workpiece, the second loader chuck 36b receives the one-side processed workpiece that has been reversed from the front and the back from the second reverse chuck 41b (step S7). In the present embodiment, as described above, in the state where the loader head 36 is positioned at the reversing device facing position P5, the first loader chuck 36a is opposed to the first reversing chuck 41a, and the second loader chuck 36b is second. In order to face the reversing chuck 41b, the workpiece is transferred between the first loader chuck 36a and the first reversing chuck 41a and the workpiece is transferred between the second loader chuck 36b and the second reversing chuck 41b at the same time. be able to.

  Next, the loader head 36 moves forward (diagonally forward to the right) to a second intermediate position P6 positioned above the right main shaft 25b (step S8), to a second main shaft facing position P7 that faces the right main shaft chuck 25b. Then, the workpiece is transferred to and from the right spindle chuck 25b (step 9). That is, the first loader chuck 36a receives the double-side processed workpiece from the right spindle chuck 25b, and passes the single-side processed workpiece from the second loader chuck 36b to the right spindle chuck 25b. Thereafter, the loader head 36 moves up to the second intermediate position P6 (step S10), thereby completing one workpiece transfer cycle, returning to step S1, and repeating the workpiece transfer cycle. By repeatedly executing the workpiece transfer cycle in this manner, both sides of the unprocessed workpiece supplied from the supply / discharge device are sequentially processed, and the double-side processed workpiece is discharged to the supply / discharge device. Is done.

  Here, in order to confirm the effect of the present invention, the workpiece transfer cycle in the conventional machine tool 201 shown in FIG. 8 will be described as follows. Referring to FIG. 9 and FIG. 10, after executing Steps S1 to S6 described above, the loader head 236 moves backward to the first reverse chuck facing position P5a and moves from the first loader chuck 236a to the left reverse chuck 241a. A single-side processed workpiece is delivered (step S71). At this time, the first loader chuck 236a and the left reverse chuck 241a face each other, but the second loader chuck 236b and the right reverse chuck 241b do not face each other, so the right load chuck 241b to the second loader chuck 236b. It is not possible to deliver a single-sided workpiece to the machine. Therefore, the loader head 236 once moves forward to the first intermediate position P3 (step S72), and after the second loader chuck 236b moves laterally to the second intermediate position P6 facing the right reverse chuck 241b (step S73), The second loader chuck 236b receives the inverted single-side processed workpiece from the right reverse chuck 241b by moving backward again to the 2 reverse chuck facing position P5b (step S74). Thereafter, the above-described steps S8 to S10 are executed to complete one workpiece transfer cycle.

  Thus, in the conventional machine tool 201, after the workpiece is transferred between the first loader chuck 236a and the left reverse chuck 241a, the loader head 236 is temporarily moved, and then the second loader chuck 236b and the right reverse chuck 241b. The workpiece was transferred between the two. On the other hand, in the present embodiment, the workpiece is transferred from the first loader chuck 36a to the first reversing chuck 41a while the loader head 36 is maintained at a predetermined position (reversing device facing position P5), and the second Since the workpiece can be received from the second reversal chuck 41b by the loader chuck 36b, these workpiece transfer operations can be performed simultaneously, and the loader head 36 and the workpiece reversing device 4 It is possible to reduce the number of operations of the loader 32 required for delivery of the workpieces performed between them, and to shorten the cycle time of the entire workpiece conveyance cycle.

  Next, the delivery of the workpiece performed between the loader head 36 and the left main spindle chuck 25a in step S5 will be described as follows. In step S5, the loader head 36 first moves the first loader chuck 36a to a position facing the left spindle chuck 25a, then moves backward by a predetermined distance, and the first loader chuck 36a is moved from the left spindle chuck 25a to one side. Receive processed workpiece. Next, after the loader head 36 has moved forward by a predetermined distance, the second loader chuck 36b is lowered to a position facing the left main spindle chuck 25a. The loader head 36 moves rearward by a predetermined distance, and after the second loader chuck 36b delivers the unprocessed workpiece to the left main spindle chuck 25a, it moves forward by a predetermined distance again. The workpiece transfer performed with the spindle chuck 25a is completed. The workpiece delivery performed between the loader head 36 and the right spindle chuck 25b in step S9 described above is similarly performed.

  Thus, since the loader head 36 makes the two loader chucks 36a and 36b face the main spindle chuck 25a (25b) in order only by linear movement, for example, by turning the swivel like the loader disclosed in Patent Document 2, Compared with the configuration in which the two loader chucks are sequentially opposed to the spindle chuck, the time required to deliver the workpiece can be shortened.

  When the workpiece is transferred between the loader head 36 and the spindle chucks 25a and 25b or the reverse chucks 36a and 36b, the loader head 36 is maintained in the state shown in FIG. When an object is transported to a peripheral device (for example, a cleaning device), the loader head 36 can be downsized by bringing the loader head 36 into a folded state, whereby the peripheral device can be downsized. For example, when a double-side processed workpiece is cleaned with a cleaning device, the cleaning tank 50 into which the loader head 36 is inserted can be made compact by placing the loader head 36 in a folded state as shown in FIG. That is, the cleaning tank 50 does not need to have a front-rear width (length in the Z-axis direction) enough to receive the swivel loader head 36 as shown in FIG. 2B, thereby reducing the size of the entire cleaning device 51. it can.

  Thus, in this embodiment, since the loader head 36 can be folded, the peripheral device can be miniaturized and the time required for delivering the workpiece to the spindle chucks 25a and 25b can be reduced. Can do.

  The machine tool according to the embodiment of the present invention has been described above with reference to the accompanying drawings. However, the present invention is not limited to the embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. It is.

  For example, in the above-described embodiment, the turning means for independently turning the first loader chuck 36a and the turning means for independently turning the second loader chuck 36b are provided, but the present invention is limited to such a configuration. Instead, for example, a turning means for turning the two loader chucks 36a, 36b simultaneously and a turning means for turning one of the two loader chucks 36a, 36b relative to the other may be provided.

  In the above embodiment, the two reversing chucks 41a and 41b are arranged in the vertical direction. However, they may be arranged in the horizontal direction as shown in FIG. 7, and in this case, as shown in FIG. In addition, the arrangement direction of the two loader chucks 36a and 36b may be set to the horizontal direction. In this way, by arranging the two reversing chucks in the horizontal direction, the height of the workpiece reversing device and thus the entire machine tool can be kept low, and the entire machine tool can be downsized.

  In addition, even when the arrangement direction of the two loader chucks 36a and 36b is set to the lateral direction as described above, the two loader chucks 36a and 36b face rearward (the state shown in FIG. 7) and the two loader chucks 36a. , 36b are preferably made to be selectively switchable between a state in which the loader chuck 36b faces downward, and a state in which one loader chuck 36b faces rearward and the other loader chuck 36a faces downward. The effect of can be obtained.

  Furthermore, in the above-described embodiment, the turret type tool rests 24a and 24b are used as the tool rest, but different types of tool rests may be used. For example, as shown in FIG. 124b can also be used. When the comb-shaped tool rests 124a and 124b are used in this way, the front spaces of the main shafts 23a and 23b spread in the lateral direction, so that the reverse chucks 41a and 41b and the loader chucks 36a and 36a, Even when 36b is arranged side by side, the loader head 36 can be easily prevented from interfering with the tool rests 124a and 124b.

  Moreover, in the said embodiment, although the arrangement position of the workpiece reversing apparatus 4 in a horizontal direction was made into the intermediate position of the two main shafts 23a and 23b, this invention is not limited to the structure which concerns, for example, the main shaft 23a or the main shaft 23b It may be just above.

  In the above embodiment, the two main shafts 23a and 23b extending in the front-rear direction are arranged side by side in the horizontal direction. However, instead of such a configuration, the two main shafts extending in the horizontal direction so that the two main shaft chucks face each other. May be arranged in the horizontal direction. In the above-described embodiment, the loader 32 is configured as a so-called three-axis loader that can move in three directions, ie, a lateral direction, a front-rear direction, and a vertical direction. Alternatively, a so-called biaxial loader that does not move in the front-rear direction may be used.

DESCRIPTION OF SYMBOLS 1 NC lathe 2 Processing apparatus 3 Workpiece conveyance apparatus 4 Workpiece inversion apparatus 25a, 25b Spindle chuck 32 Loader 36 Loader head 36a, 36b Loader chuck 37 Support member 41a, 41b Inversion chuck

Claims (9)

A machine tool comprising processing means including two spindles, a workpiece reversing device for reversing the workpiece, and a workpiece conveying device for conveying the workpiece,
The workpiece reversing device includes a first reversing chuck and a second reversing chuck arranged side by side in a predetermined direction,
The workpiece transfer device includes a first loader chuck and a second loader chuck arranged side by side in the predetermined direction,
The machine tool according to claim 1, wherein a distance between the first reversing chuck and the second reversing chuck in the predetermined direction is substantially the same as a distance between the first loader chuck and the second loader chuck in the predetermined direction.   The workpiece transfer device is configured to be movable in a lateral direction and a front-rear direction, the first loader chuck delivers the workpiece to the first reverse chuck, and the second loader chuck is moved from the second reverse chuck. The workpiece is configured to be received, and the workpiece is transferred from the first loader chuck to the first reversing chuck in a state where the workpiece transfer device is maintained at a predetermined position, and the second loader The machine tool according to claim 1, wherein the workpiece is received from the second reversal chuck by the chuck. The workpiece transfer from the first loader chuck to the first reversing chuck and the workpiece receiving from the second reversing chuck by the second loader chuck are performed simultaneously. Item 3. The machine tool according to Item 2.   The machine tool according to claim 1, wherein the two main shafts are arranged side by side in the horizontal direction, and the first and second loader chucks are arranged in a vertical direction.   The machine tool according to any one of claims 1 to 3, wherein the two main shafts are arranged side by side in the horizontal direction, and the first and second reversing chucks are also arranged in the horizontal direction.   The first loader chuck is configured to be rotatable relative to the second loader chuck. A rotation center line of the first loader chuck is perpendicular to the predetermined direction and the chuck of the first loader chuck. The machine tool according to claim 1, wherein the machine tool is parallel to the surface. A workpiece transfer device used in a machine tool for processing a workpiece,
Comprising first and second loader chucks for gripping a workpiece;
The first and second loader chucks are arranged side by side in a predetermined direction;
The first loader chuck is configured to be turnable relative to the second loader chuck, and a turning center line of the first loader chuck is perpendicular to the predetermined direction and a chuck surface of the first loader chuck. A workpiece conveying device characterized by being parallel to the workpiece.   A support member for pivotally supporting the first and second loader chucks, a first turning means for turning the first loader chuck relative to the support member, and the second loader chuck for the support member. The turning center line of the first loader chuck and the turning center line of the second loader chuck coincide with each other. Workpiece conveying device.   9. A machine tool comprising processing means for processing a workpiece and a workpiece conveying device for conveying the workpiece, wherein the workpiece conveying device is the workpiece according to claim 7 or 8. A machine tool characterized by being an object conveying device.

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