JPS6214365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-spindle lathe equipped with a workpiece measuring device.

A lathe shown in FIGS. 1 and 3 is a lathe that has two main spindles and can machine the front and back sides of a workpiece in one cycle.

That is, the lathe shown in FIG.
A loader 5 supported by a letter-shaped swing arm 4
a workpiece reversing device 8 consisting of a fixed chuck 6 provided above the loader and a turning chuck 7 rotating around a vertical axis; and an XX' axis provided in front of each of the spindle chucks 1 and 2; It is composed of turret tool rests 9 and 10 that are movable in the YY' axis direction, and the four arms 4 of the rotating arm 4.
a, 4b, 4c, and 4d have two loader chucks 11, 12, 13, and 14 provided at their ends that are open at an angle that allows them to overlap with the main shaft chucks 1 and 2, and the loading chute is In the following manner, the incoming workpiece W sent over the workpiece 15 is sequentially loaded into the two spindle chucks 1 and 2 and the workpiece reversing device 8, subjected to turning processing, and sent to the delivery chute 16. ing.

That is, as shown in FIG. 2, the loader 5 is first moved backward to load the unprocessed material work Wp onto the loader chuck 11 of the swing arm 4a (FIG. 2A).

At this time, spindle chucks 1 and 2 contain a semi-machined workpiece Wq that has already been turned in the previous machining cycle, that is, a workpiece Wq that has only the front surface machined, and a fully machined workpiece Wr, that is, a workpiece Wr whose back surface has also been machined. is being checked.

A semi-finished workpiece Wq whose surface has been machined in the previous machining cycle and which has been turned over by the rotating chuck 7 is chucked in the stationary chuck 6 of the front/back reversing device 8 .

Next, the loader 5 is moved forward and rotated 90 degrees in the direction of the arrow to bring the loader 5 into the state shown in FIG.
In addition to receiving Wq and Wr, the semi-finished workpiece Wq on the fixed chuck 6 is also received by the loader chuck 12 (FIG. 2b).

In the above condition, loader chuck 11, 12, 1
Since the workpieces Wp, Wq, Wq, and Wr are chucked at 3 and 14, respectively, and the spindle chucks 1 and 2 are empty, the loader 5 is moved 180 degrees in the direction of the arrow.
Rotate it once until it is in the state shown in Figure 2 (c).

In this state, the loader 5 is moved backward and the empty spindle chucks 1 and 2 are placed on the unprocessed work Wp and semi-processed work Wq on the loader chucks 11 and 12.
At the same time, the semi-finished workpiece Wq on the loader chuck 13 is transferred onto the turning chuck 7 of the reversing device (FIG. 2C).

Therefore, while all the processed workpieces Wr are chucked on the loader chuck 14, the loader 5 is then rotated 90 degrees in the direction of the arrow to achieve the state shown in FIG. At the same time, the empty loader chuck 11 receives the unprocessed workpiece Wp on the carry-in chute 15, and at the same time rotates the spindles 1 and 2 to load the workpiece.
Start turning Wp and Wq (Fig. 2 D).

At this time, the reversing device 8 is activated to transfer the semi-finished workpiece Wq to the fixed chuck 6 side, and the workpiece Wq
Make sure the back side faces forward.

With this, the loader 5 returns to its original position again and one cycle ends.

The lathe shown in Fig. 3 has almost the same structure as the lathe shown in Fig. 1, and the same structural parts are given the same numbers and explanations are omitted. , 2, which is supported by a shaft 3 which is rotatable and movable back and forth, is not shaped like an X like the lathe shown in FIG. 1, but has the following shape.

That is, similar to the lathe shown in FIG. 1, the swing arm 17 of this lathe has loader chucks 21, 22, 23,
Two sets of bifurcated arms 17a, 17 opened at an angle that allows the two pieces of 24 to overlap the main shaft chucks 1 and 2.
b, 17c, 17d, and these bifurcated arms 17a, 17b, 17
c and 17d are not in symmetrical positions with respect to the shaft 3, that is, they are not in an X-shape, and the angle α between the two sets of arms 17a, 17b, 17c, and 17d is an acute angle as shown below. placed in a
It is fixed to the shaft 3.

In other words, when the pivoting arm 17 is in the vertically upward direction, the pinch angle α is
Loader chuck 22 of b and arm 17 of the other set
The loader chucks 23 of c and 17d are set at an angle such that they overlap the fixed chuck 6 and the rotating chuck 7 of the workpiece reversing device 8.

In the lathe shown in FIG. 3, the incoming workpiece W sent on the carry-in chute 15 is sequentially loaded into the two main spindle chucks 1 and 2 and the workpiece reversing device 8 in the following manner. It is turned and sent out to a delivery chute 16.

As shown in FIG. 4, first, the loader 25 is moved backward, and the unprocessed workpiece Wp is loaded onto the loader chucks 21 and 22 of the bifurcated arms 17a and 17b of one set of the rotating arm 17, respectively.
At the same time, the semi-finished workpiece Wq is loaded from the fixed chuck 6 of the front-back reversing device 8 (FIG. 4A).

The semi-processed workpiece Wq on the fixed chuck 6 has already had its surface turned by turning in the previous machining cycle and has been turned over by the front-back reversing device 8 so that the back side faces forward.

The semi-processed workpiece Wq before reversal is placed on the turning chuck 7.
is being checked.

At this time, spindle chucks 1 and 2 contain semi-machined workpieces that have already been turned in the previous machining cycle.
Wq, that is, a workpiece Wq whose surface has been machined only, and a fully machined workpiece Wr, that is, a workpiece Wr whose back surface has also been machined are checked.

Next, the loader 25 is moved forward and rotated approximately 135 degrees in the direction of the arrow to move the loader 25 to the fourth position.
The loader chuck 2 of the other set is not in the state shown in Figure B.
3 and 24, the workpieces Wq and Wr chucked on the spindle chucks 1 and 2 are received (FIG. 4b).

At this time, the turning chuck 7 is turned, and the semi-finished workpiece Wq, whose surface is facing forward, is transferred to the fixed chuck 6 side and turned over.

In the above condition, the loader chucks 21, 22, 2
3, 24 all have workpieces Wp, Wq, Wq, Wr
is checked and the main shaft chucks 1 and 2 are empty, so the loader 25 is then rotated approximately 90 degrees in the direction of the arrow to achieve the state shown in FIG. 4C.

In this state, the loader 25 is moved backward and the unprocessed work Wp and semi-processed work Wq on the loader chucks 21 and 22 are transferred to the empty spindle chuck 1,
2 (Figure 4 C).

Next, when the loader 25 is rotated approximately 135 degrees in the direction of the arrow and the loader 25 is again directed directly upward, the loader chucks 21 of one set of arms 17a and 17b,
22, no work is loaded, and the other set of loader chucks 23 and 24 are loaded with a semi-processed work Wq and a completed work Wr, so the completed work Wr is transferred onto the carry-out chute 16. , one cycle is completed when the semi-processed workpiece Wq is transferred to the turning chuck 7 of the reversing device 8 (FIG. 4D).

The lathes shown in Figures 1 and 3 are constructed as described above, but these lathes also automatically measure the workpiece that is carried out on the carry-out chute 16 and turn the turret based on the measured value. Tool rest 9,10
The amount of movement of the machine is controlled by feedback, and the workpiece can be machined more accurately.

However, in the above-mentioned lathes, since they perform front and back machining in the cycle described above, the workpiece that is carried out on the carrying-out chute 16 is measured, and based on the measured value, the workpiece is immediately moved to the turret tool rests 9 and 1.
Even with feedback control of 0, several workpieces on the loaders 5 and 25 or on the spindle chucks 1 and 2 have already been machined, and the points that need correction found by measuring the workpieces remain uncorrected. Inappropriate workpieces were being produced in vain.

In other words, in the lathe shown in FIGS.
By measuring Wr, there are already two or three pieces on the spindle chucks 1 and 2 and on the work reversing device 8.
A part of the semi-processed workpiece Wq has been completed, and the workpiece Wq is carried out in an improperly processed state, or the workpiece Wq is further processed on the back side and then carried out.

In order to eliminate waste as described above, for example, the measuring head of the workpiece is attached to the turret tool rests 9 and 10, and after a certain amount of machining on one side of the spindle is completed, the turret tool rests 9 and 10 are moved. If measurement is performed, the number of tools that can be installed on the turret tool rests 9 and 10 will be reduced accordingly, and an extra operation of indexing and moving the turret tool rests 9 and 10 will be required during the workpiece machining cycle. Another problem arose in that the overall machining cycle time was lengthened.

Therefore, the present invention enables feedback control based on workpiece measurement values to be applied to a workpiece to be machined next to the measured workpiece in a two-axis lathe as described above, without causing any of the other problems described above. The purpose of this invention is to provide a lathe that can be used immediately and minimize the production of incorrect workpieces.The gist is that in the lathe described above, the workpiece is turned upside down in front of one of the spindle chucks. The main feature is that a measuring device for the semi-processed workpiece is attached to provide feedback control of the amount of movement of the tool post on the side that partially processes the workpiece.

Next, an embodiment will be described. In FIGS. 5 to 7, an example will first be shown in which the present invention is applied to a lathe in which the loader 5 shown in FIG. 1 has an X-shape. In the figure, the parts of the equipment with the same numbers as those of the lathe shown in Fig. 1 are the same parts of the equipment as the lathe shown in Fig. 1, and they have the same structure except for the device for reversing the workpiece. The description will be omitted, and the workpiece reversing device 28 of this embodiment will be described in detail below.

The workpiece reversing device 28 of this example includes a post 31 having a C-shape in side view and provided on the bearing block 29 of the shaft 3 of the loader 5;
It consists of a swing chuck 34 that is driven to swing around a vertical axis 33 by a rotary actuator 32 mounted on the top, and a workpiece measuring device 35 fixed to the side of the bearing block 29. The workpiece W transferred to the rotating chuck 34 is rotated by the rotating chuck 34 around the vertical axis 33.
When the measuring head 36 of the measuring device 35 (described later) protrudes forward after turning 180 degrees, the measuring head 36
is fitted into the center hole P of the annular workpiece W held by the rotating chuck 34, so that the inner diameter of the annular workpiece W can be measured.

37 is a support for the swing chuck 34, and 38 is a swing arm.

Next, the workpiece measuring device 35 fixed to the side surface of the bearing block 29 via the fixing plate 39 will be explained in detail based on FIG. The measurement head 36 has a tip 3 corresponding to the center hole P of the workpiece W to be handled.
From grooves 36b having an outer diameter of 6a and bored on both sides,
A measuring pin 42 of a micrometer built in the tip 36a can be horizontally projected to both sides.

36c is a flange portion for holding the workpiece W;
Reference numeral 36d indicates a flange portion on the proximal end side, and the flange portion 36d on the proximal end side is loosely fitted into a support box 44 provided on the movable plate 43, so that the distal end side 36a of the measurement head 36 is attached to the movable plate 43. The center of the workpiece W can be moved slightly depending on the position of the workpiece W held forward by the swing chuck 34, and even if there is a slight positional deviation, the center of the workpiece W A measuring head 36 can be fitted into the hole P.

45 is a steel ball interposed between the support box 44 and the flange portion 36d.

The movable plate 43 has a guide shaft 51, which has guide tubes 46, 47 provided at the upper and lower parts thereof fixed to the fixed plate 39 via brackets 48, 49.
The cylinder 55 is slidably supported by the cylinder 52 so as to be movable in the front and back direction, and the upper end is connected to the end of the rod 56 of the cylinder 55, which is also fixed to the fixing plate 39 at 53 and 54, so that the cylinder 55 can expand and contract. Then, the measuring head 36 is moved back and forth in parallel together with the moving plate 43 (solid line and chain line in FIG. 6). Reference numeral 58 denotes stopper bolts 59 and 6 that regulate the protruding position of the tip of the rod 56 of the cylinder 55.
0 are proximity switches for detecting the front and rear positions of the moving plate 43, that is, the measurement head 36;
Reference numeral 2 denotes a rib and a connecting block that fix the fixing plate 39 to the bearing block 29.

The lathe of the embodiment shown in FIGS. 5 and 6 operates according to the machining cycle shown in FIG. 7, which is the same as that shown in FIG. 2 and explained at the beginning, and turns the workpiece W. Rotate the main shafts 1 and 2 at D,
Workpieces Wp and Wq gripped by the main spindles 1 and 2
Before machining the workpieces Wq, Wr as follows:
Measurements will be made.

That is, the turning chuck 34 is rotated to bring the workpiece Wq, whose surface has already been machined, to the front of the measuring head 36 (dotted chain line in Fig. 6), and then the measuring head tip 36a is moved to the workpiece W as described above. The semi-finished workpiece is inserted into the center hole P and the measuring pin 42 of the micrometer is made to protrude to the side.
The inner diameter of Wq is measured, and the work Wr, which has already been machined on both the front and back sides using the other two spindles 1 and 2, is measured by a known measuring device 63 installed in the middle of the unloading chute 16.
Measure its inner diameter etc. Then, based on the measured values, the amount of movement of the turret tool rests 9 and 10 is feedback-controlled, and the respective second workpieces Wp and Wq loaded on the spindles 1 and 2 are
The process is corrected appropriately.

That is, based on the measured values of the semi-finished workpiece Wq measured by the measuring head 36, the main spindle 1 and the turret tool rest 9 on the left side of FIG. Based on the measured values of all processed workpieces Wr, the main spindle 2 and the turret tool rest 10 on the right side of FIG. 5 are feedback-controlled.

The swing chuck 34, which has delivered the semi-processed workpiece Wq to the measuring head 36 as described above, immediately returns to its original position, and the semi-processed workpiece Wq, which has been delivered to the measurement head tip 34a by the swing chuck 34, Next, when the process advances to the state shown in FIG.

In addition, the turning chuck 34 that transferred the workpiece Wq to the measuring head 36 in the state shown in FIG.
The inner diameter of the center hole P of Wq is too small, and the measuring head 3
If the measuring head tip 36a does not fit into the center hole P of the work Wq held in front of the measuring head 36 even if the measuring head 6 is moved forward, the proximity switch 60 will not close and the lathe will not operate. automatically stops, and the worker takes out the workpiece Wq as an rejected item.

Of course, even if the inner diameter of the workpiece Wq is found to be excessive as a result of measurement by the measurement head 36, it is also possible to automatically stop the operation of the entire lathe without performing feedback control.

Next, FIGS. 8 to 10 show an embodiment in which the present invention is applied to the lathe shown in FIG. 3, in which the loader 25 is palm-shaped.

In the figure, the parts of the equipment with the same numbers as those of the lathe shown in Fig. 3 are the same parts of the equipment as the lathe shown in Fig. 3, and they have the same structure except for the device for reversing the workpiece. The description thereof will be omitted, and the workpiece reversing device of this embodiment will be described in detail below.

The workpiece reversing device 68 in this example has a structure similar to that of the aforementioned reversing device 8, and includes a post 69 that is C-shaped in side view and is provided on the bearing block 29 of the shaft 3 of the loader 25. A swing chuck 72 that is driven to swing around a vertical axis 71 by a rotary actuator 70 mounted on the upper part.
and a workpiece measuring device 73 fixed to the side surface of the bearing block 29. When the measuring head 74 moves forward toward the workpiece W held in front of the measuring head 74 by the loader 25, a measuring device 73 with a built-in micrometer is installed. The tip fits into the center hole P of the annular workpiece W, so that the inner diameter of the annular workpiece W can be measured.

75 is a pivot arm of the pivot chuck 72.

Next, the workpiece measuring device 73 fixed to the side surface of the bearing block 29 via the fixing plate 76 will be explained in detail based on FIG. The measurement head 74 has a tip 74a having an outer diameter corresponding to the center hole P of the workpiece W to be handled, and the tip 7 is moved from grooves 74b formed on both sides.
Micrometer measurement pin 7 built into 4a
8 can be projected horizontally to both sides.

74c is a flange portion for holding a workpiece, 79 is a proximity switch attached to the flange portion 74c for detecting the presence or absence of a workpiece, and 74d is a flange portion on the base end side; A spherical recess 81 is formed in the recess 81, and a link ball 83 screwed onto the upper end of the moving plate 82 is loosely fitted into the recess 81, and the measuring head 74 is moved so that its distal end side is slightly relative to the moving plate 82. The three bolts 84, which are swingable and protrude from the flange portion 74d, are connected to the movable plate 8.
2 through the through hole 85 drilled in the movable plate 82.
A compression spring 87 is interposed between a nut 86 screwed onto a bolt 84, and the measurement head 74 is adjusted so that it always extends horizontally forward as shown in FIG.

By doing the above, the tip of the measuring head 74 moves slightly according to the position of the workpiece W held in front of the measuring head 74, and even if there is a shift in the position of the workpiece, the center of the workpiece A measuring head 74 can be fitted into the hole P.

The movable plate 82 connects the guide tubes 88 and 89 provided at the lower and middle portions to the brackets 90 and 89.
The guide shafts 92 and 93 fixed to the fixed plate 76 via the guide shafts 91 are slidably supported to be movable in the front and rear direction, and the guide tubes 88 and 8
9 is connected 97 to the end of a rod 96 of a cylinder 95 which is also fixed 94 to the fixed plate 76, so that when the cylinder 95 expands and contracts, the measuring head 74 moves back and forth in parallel with the movable plate 82. (solid line and chain line in Figure 9). Reference numerals 98 and 99 are proximity switches for detecting the forward and backward positions of the movable plate 82, that is, the measurement head 74, and 100 is a stopper bolt for regulating the forward position of the movable plate 82.

The lathe of the embodiment shown in Figs.
The machine operates according to the machining cycle shown in the figure, which is the same as that shown in FIG. 4 and described at the beginning, except that the positions of the swivel chucks 7, 72 are reversed on the left and right sides.

The lathe of this embodiment rotates the main shafts 1 and 2 in the process shown in FIG.
Perform measurements.

That is, in FIG. 10D, when the loader 25 retreats and the workpiece Wq, whose surface has already been processed and which is held by the loader chuck 23, is brought forward to the measurement head 74, the measurement head 74 is moved as described above. The tip 74 of the measurement head 74 is moved forward.
a is inserted into the center hole P of the workpiece, and the measuring pin 78 of the micrometer protrudes, causing the semi-finished workpiece to be cut.
The inner diameter of Wq is measured (dotted chain line in Figure 9). When the measurement is completed, the loader 25 moves forward and the work Wq remains on the measurement head 74 while being delivered onto the tip 74a of the measurement head 74.

The workpiece Wr, which has already been machined on both the front and back sides by the two main spindles 1 and 2, has its inner diameter etc. measured by a known measuring device 63 provided in the middle of the carry-out chute 16.

Based on the measured values, the amount of movement of the turret tool rests 9 and 10 is feedback-controlled to appropriately correct the machining of the second workpieces Wp and Wq loaded on the spindles 1 and 2, respectively.

That is, based on the measured values of the semi-finished workpiece Wq measured by the measuring head 74, the main spindle 2 and the turret tool rest 10 on the right side of FIG. Based on the measured values of all processed workpieces Wr, the main spindle 1 and the turret tool rest 9 on the left side of FIG. 8 are feedback-controlled.

Note that the semi-finished workpiece Wq that has been transferred and remains on the tip 74a of the measuring head 74 as described above will be rotated by the turning chuck 72 when the process proceeds to FIG. 10B. The workpiece is then gripped by the turning chuck 72 and removed from above the measuring head 74, and in the next process shown in FIG.
Wq is held by the turning chuck 72 and is held with its back side facing forward.

In addition, in the state shown in FIG. 10 D described above, the loader 25
moves backward and brings the workpiece Wq in front of the measurement head 74, moves the measurement head 74 forward, and tries to fit the tip 74a into the center hole P of the workpiece, but if the inner diameter of the center hole P of the workpiece is too small, the measurement Since the head 74 does not fit into the center hole P and cannot move forward beyond a certain level, the proximity switch 99 does not close.
It is detected that the workpiece Wq is an NG product, and in the case of this lathe, the loader 25 once turns over in the direction of the arrow and the loader chuck 2
Unload the rejected workpiece Wq gripped in 3 to chute 1
It is designed to be automatically discharged through 6.

After discharging the NG workpiece Wq, the loader 25 returns to the state shown in FIG. 10D, that is, FIG.
The machining of the other workpieces Wp and Wq continues with the piece missing during the machining cycle.

That is, the proximity switch 79 of the measurement head 74 detects that the workpiece Wq of the NG product is missing during the machining cycle, and the proximity switch 79
The signal is sent to the subsequent process that would be followed if the workpiece Wq of the NG item is not removed, that is, the turning chuck 72, the loader chuck 22, and the main spindle 1, and the signals are sent to the respective devices 72, 22, 1.
The workpiece W presence confirmation device installed in
While the work Wq of the product is missing, another work Wp,
Processing of Wq is progressing.

Of course, even if the inner diameter of the workpiece W is found to be excessive as a result of measurement by the measurement head 74, the workpiece W can be automatically removed by the same method as described above without performing feedback control.

When the present invention is applied to a lathe in which the loader 25 is palm-shaped as described above, as a result of measurement by the measuring device 73, the work W that significantly exceeds the set value, that is, the work W that is an NG product. Turn the loader 25 over as described above (Fig. 10 E),
The loader 25 can be discharged onto the unloading chute 16, but this is because the loader 25 is palm-shaped, and even if the loader chuck 23 holding the rejected workpiece W is indexed to the unloading chute 16 position (FIG. 10), the loader 25 is palm-shaped.
The other arms 17a, 17b, 17d of 5 do not come to the main shafts 1, 2 positions, and the main shafts 1, 2 and the main shafts 1, 2
This has been made possible because it does not interfere with the workpieces Wp, Wq, the turret tool rests 9, 10, etc. loaded on the turret.

In the above two embodiments, the workpiece measuring devices 35 and 73 have measuring heads 36 and 74 that can be fitted into the center hole P of the workpiece.
The inner diameter of the workpiece W is measured using a micrometer built into the workpiece W, but the workpiece measuring device is not limited to the above example, and may include a large diameter measurement head that can fit onto the workpiece W. It may be a device with which the outer diameter of the workpiece is measured, or a device with which the thickness of the workpiece is measured which has a clamping means for clamping the workpiece in the thickness direction.

Further, the workpiece reversing devices 28 and 68 are not limited to the embodiments described above, but may be movably supported by a guide shaft 101 horizontally provided above the loader 5, as schematically shown in FIG. It consists of a moving frame 102, a gripper 104 rotatable around a vertical axis by a rotary actuator 103 attached to the moving frame 102, and a cylinder 105 for moving the moving frame 102, and is shown by solid lines and chain lines in FIG. The gripper 104 may be reversed while reciprocating between the gripper 104 and the gripper 104.
4, when the workpiece W is clamped at the solid line position in FIG. 11, the outer diameter is immediately indicated by the opening angle of the gripper 104, so if a measuring device is installed inside the gripper 104, measurement can be performed at the same time as clamping. The workpiece W can be reversed more quickly.

In any case, as described above, this invention has two
It has a main spindle chuck for books, a loader in which a swing arm is supported by a rotatable and freely movable shaft provided above the two main spindle chucks, and a workpiece flipping device provided above the loader. death,
In a lathe, the above-mentioned turning arm consists of two sets of bifurcated arms that are opened at an angle such that a loader chuck provided at the tip thereof overlaps with the position of the two main spindle chucks, and a workpiece measuring device is attached to the above-mentioned workpiece turning device. However, since the workpiece is measured while it is supported on the workpiece's front-back reversing device, the workpiece can be measured in the middle of the machining cycle without extending the machining cycle time, and the measured value Based on this, the processing of subsequent workpieces can be immediately controlled by feedback, and the production of inappropriate workpieces can be minimized.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a two-spindle type lathe with an X-shaped loader, Figure 2 is an explanatory diagram of the machining cycle of the lathe shown in Figure 1, and Figure 3 is a two-spindle type lathe with a palm-shaped loader. FIG. 4 is an explanatory diagram of the machining cycle of the lathe shown in FIG. 3, FIG. 5 is a partially omitted front view of a lathe with an X-shaped loader in which the present invention is implemented, and FIG. 6 is a perspective view of the lathe shown in FIG.
The figure is a side view of the workpiece measuring device with the fixing plate omitted (an enlarged view taken along the - line in Figure 5), Figure 7 is an explanatory diagram of the machining cycle of the lathe shown in Figure 5, and Figure 8 is the invention according to the present invention. Figure 9 is a partially omitted front view of a lathe with a palm-shaped loader, and Figure 9 is a side view of the workpiece measuring device (an enlarged view taken along the - line in Figure 8). Figure 10 is the same as shown in Figure 8. FIG. 11, which is an explanatory diagram of a machining cycle of a lathe, is a schematic front view showing another embodiment of a device for reversing a workpiece. 1, 2...Main shaft chuck, 3...Shaft,
4, 17... Swivel arm, 5, 25... Loader,
28, 68...Workpiece front/back reversal device, 11,1
2, 13, 14... Loader chuck, 21, 2
2, 23, 24... Loader chuck, 35, 73
... Workpiece measuring device.

Claims (1)

[Claims] 1. Two main spindle chucks, two tool rests that cut and move the workpiece in front of the two main spindle chucks,
A loader having a swing arm supported by a rotatable and freely movable shaft provided above the two main shaft chucks, and a workpiece reversing device provided above the loader; consists of two sets of bifurcated arms with a loader chuck installed at the tip thereof opened at an angle that overlaps the two spindle chuck positions, and a partially machined workpiece that has been partially machined at one spindle chuck position. In a two-spindle lathe, the workpiece is received from the chuck by a loader, fed to the other spindle chuck with its front and back reversed through the above-mentioned front-back reversing device, and the remaining machining is performed at the other spindle chuck position. , a workpiece measurement device characterized in that the workpiece front-back reversing device is equipped with a half-processed workpiece measuring device for feedback-controlling the amount of movement of a tool rest for partially processing the workpiece in front of the one spindle chuck. Lathe with equipment.