JP2023082257A - Workpiece pressing device, machine tool and workpiece pressing method - Google Patents

Abstract

To provide a workpiece pressing device, a machine tool and a workpiece pressing method capable of pressing a workpiece properly.SOLUTION: A workpiece pressing device 40 includes: a pusher 41 provided so as to be movable relative to a bed 11 in a prescribed axial direction and pushing a workpiece temporarily attached to a shaft toward the shaft along the prescribed axial direction; and an auxiliary pressure device 42 provided so as to be movable relative to the bed 11 in the prescribed axial direction and pushing, toward the shaft, the workpiece pushed by the pusher 41 along the prescribed axial direction.SELECTED DRAWING: Figure 1

Description

The present specification relates to control devices and machine tools.

Conventionally, for example, a center pushing tool (hereinafter simply referred to as a "pushing tool") for an NC lathe disclosed in Patent Document 1 below is known. This conventional pushing tool is a pusher that can be attached to and detached from the tool base of the turret device and corrects the workpiece to the center position, and is provided in an NC lathe equipped with a tailstock (tailstock).

Japanese Utility Model Laid-Open No. 5-78401

In the conventional pusher described above, the pusher is mounted on the tool rest of the turret device. Therefore, when the pusher presses and pushes the work, there is a possibility that an excessive load is applied to the turret device. Therefore, with the conventional pushing tool, it is necessary to reduce the load on the turret device, and as a result, the pushing of the workpiece by the pusher may be insufficient.

An object of the present specification is to provide a work pressing device, a machine tool, and a work pressing method capable of appropriately pressing a work.

The present specification includes a pusher that is provided to be relatively movable in a predetermined axial direction with respect to the bed, and presses a workpiece that is temporarily attached to the shaft along the predetermined axial direction toward the shaft; Disclosed is a work pressing device provided so as to be relatively movable in an axial direction and having an auxiliary pressing device for pressing a work pressed by a pusher along a predetermined axial direction toward a shaft.

According to this, the pusher can press the work temporarily attached to the shaft toward the shaft, and the auxiliary pressing device can press the work pressed by the pusher toward the shaft. Therefore, in the work pressing device, the auxiliary pressing device can press the work toward the shaft by eliminating the insufficient pressing of the work by the pusher.

It is a schematic perspective view showing the whole machine tool. It is a figure for demonstrating the structure of a machine tool. It is a partial sectional view for explaining composition of a work pressing device. FIG. 4 is a partial cross-sectional view for explaining a state in which the pusher of FIG. 3 presses a work; FIG. 4 is a partial cross-sectional view for explaining a state in which the auxiliary pressing device of FIG. 3 presses a work; FIG. 11 is a partial cross-sectional view for explaining a state in which a work pressing device presses a work according to a first modified example; FIG. 11 is a partial cross-sectional view for explaining a state in which a work pressing device presses a work according to a second modification; FIG. 11 is a partial cross-sectional view for explaining a state in which an auxiliary pressing device of a work pressing device presses a work according to a third modification;

A work pressing device, a machine tool, and a work pressing method will be described below with reference to the drawings. In this embodiment, a case where a machine tool, which is an NC lathe, cuts a workpiece that is pressed and positioned by a workpiece pressing device will be described as an example.

1. machine tool 10
The machine tool 10 is provided on a bed 11 and includes a headstock 20, a machining head 30 and a work pressing device 40, as shown in FIGS. The machine tool 10 includes a control device 12 that controls the operation of each of the headstock 20 , the machining head 30 and the work pressing device 40 . Here, the control device 12 has a computer device as a main component, and controls the operation of each of the headstock 20, the machining head 30, and the work pressing device 40 by executing various programs (not shown). do

In this embodiment, the bed 11 employs a slant bed structure in which the guide surface 111 is inclined toward the front side of the machine body in the X-axis direction (front-rear direction of the machine body). However, as for the structure of the bed 11, it goes without saying that a flat bed structure without the inclined guide surface 111 can be adopted.

The headstock 20 rotatably supports a main spindle 21 having an axis O along a Z-axis direction (body width direction), which is a predetermined axial direction. The main shaft 21 is rotationally driven by, for example, a spindle motor. The headstock 20 is provided with a spindle chuck 22 that grips the workpiece W at the tip of the spindle 21 . Further, in this embodiment, as shown in FIG. 2, an insertion hole 211 is provided in the main shaft 21 to hold the shaft-shaped work W. As shown in FIG. Inside the main shaft 21, an extrusion device 23 is incorporated that advances and retracts the extrusion shaft along the axis O by means of an actuator. Depending on the shape of the workpiece W, the insertion hole 211 and the pushing device 23 can be omitted.

As shown in FIGS. 1 and 2, the machining head 30 includes a guide 31 extending in the Z-axis direction on the guide surface 111 of the bed 11, and a guide 31 slidably assembled to the guide 31 to move in the Z-axis direction. and a Z-axis slide 32 guided by. The machining head 30 also includes a pair of guide rails 33 extending in the X-axis direction on the Z-axis slide 32 and an X-axis slide 34 guided by the guide rails 33 in the X-axis direction. The Z-axis slide 32 and the X-axis slide 34 are reciprocated along the guide 31 and the guide rail 33 by a servomotor and a ball screw mechanism (not shown), respectively.

Machining head 30 also includes a turret assembly 35 supported on X-axis slide 34, as shown in FIG. In the turret device 35, a polygonal tool table 36 is rotatable about a rotation axis parallel to the Z-axis. The turret device 35 rotates a predetermined tool 37 or pusher 41 according to the machining of the work W among various tools 37 attached to each side of the tool table 36 and a pusher 41 forming a work pressing device 40 to be described later. Select by delivery.

Here, the machining head 30 is supported by an X-axis slide 34. As shown in FIG. Also, the X-axis slide 34 is supported by the Z-axis slide 32 . As a result, the machining head 30 moves in the direction along the guide surface 111, that is, in the Z-axis direction (body width direction), which is a predetermined axial direction, and in the X-axis direction ( (longitudinal direction of the fuselage) and the Y-axis direction (vertical direction of the fuselage). Then, the machining head 30 is positioned at a machining position where the tool 37 processes the workpiece W or at a pressing position where the workpiece pressing device 40, which will be described later, presses the workpiece W, by the Z-axis slide 32 and the X-axis slide 34 that have moved. be.

2. Work pressing device 40
As shown in FIGS. 1 and 2, the work pressing device 40 includes a pusher 41 attached to the tool base 36 of the turret device 35 in the machining head 30 and an auxiliary pressing device provided movably relative to the bed 11. and a tailstock 42 as. Here, the tailstock 42 is one device forming the machine tool 10, and in this embodiment, the tailstock 42 is used as an auxiliary pressing device.

2-1. Pusher 41
The pusher 41 has a base plate 411, a guide portion 412, a shaft 413 as a pressed portion, a spring 414, and a plate member 415, as shown in FIG. The base plate 411 is a member for attaching the pusher 41 to the tool rest 36 of the turret device 35 .

The guide portion 412 accommodates and guides the convex portion W1 provided on the work W and presses the work W. As shown in FIG. For this reason, the guide portion 412 has a conical concave portion whose inner diameter gradually decreases as the distance from the convex portion W1 of the work W increases. Accordingly, the guide portion 412 guides the work W toward the axis O of the main shaft 21, which is a shaft body, by accommodating the convex portion W1 of the work W. As shown in FIG.

Here, when mounting the work W on the headstock 20, as shown in FIG. It is positioned at a position coaxial with the axis O. As a result, the guide portion 412 guides the workpiece W (convex portion W1) to the axis O of the spindle 21 of the headstock 20 .

As shown in FIG. 3, the shaft 413 has a fixing portion 413a for coaxially fixing the guide portion 412 on its distal end side, and an accommodation recess 416 for accommodating a pressing portion 421 of the tailstock 42, which will be described later, on its proximal end side. have. The accommodation recess 416 is coaxial with the shaft 413 , in other words, coaxial with the axis of the pusher 41 including the guide portion 412 . In this embodiment, as shown in FIG. 3, when the pusher 41 is arranged at the pressing position, that is, when the pusher 41 is arranged coaxially with the axis O of the main shaft 21, the accommodation recess 416 is opened. It becomes coaxial with the axis O. Further, the shaft 413 has a large-diameter flange portion 413b at a substantially central portion, and the outer peripheral surface on the distal side of the flange portion 413b is slidably supported by a slide bearing 417, and the flange portion 413b is on the proximal side of the flange portion 413b. A spring 414 is arranged in the .

The spring 414 is accommodated between the flange portion 413b of the shaft 413 and a plate member 415 fixed to the base plate 411, and is radially supported by a collar 418. As shown in FIG. Spring 414 is in a compressed state between flange portion 413 b and plate member 415 . As a result, the shaft 413 is constantly urged in the direction in which the flange portion 413b comes into contact with the stepped portion formed inside the base plate 411 by the first pressing force F1 (see FIG. 4, for example) by the spring 414. there is Therefore, the shaft 413 is biased in the direction in which the guide portion 412 accommodating the convex portion W1 of the work W presses the work W, that is, in the direction along the axis O which coincides with the Z-axis direction, which is the predetermined axial direction. ing.

Furthermore, the pusher 41 has a proximity switch 419 that outputs a signal corresponding to the distance between the base plate 411 and the guide portion 412 . For example, the proximity switch 419 outputs an ON signal to the control device 12 when the distance between the base plate 411 and the guide portion 412 is less than a preset threshold, and outputs an OFF signal to the control device 12 when the distance is equal to or greater than the threshold. Output. Here, the threshold value is, for example, a value determined based on the magnitude of the load acting on the tool rest 36 of the turret device 35 . Needless to say, a detector other than the proximity switch 419 can be used as long as the positional relationship between the base plate 411 and the guide portion 412 can be detected.

2-2. Tailstock 42
The tailstock 42 is for centering the workpiece W temporarily mounted on the spindle 21 . The tailstock 42 is also called a tailstock when used in a lathe, and is arranged coaxially with the axis O of the main shaft 21 of the headstock 20 in the Z-axis direction. As shown in FIGS. 2 and 3 , the tailstock 42 includes a shaft-shaped pressing portion 421 and a support portion 422 that supports the pressing portion 421 . The shaft-shaped pressing portion 421 has a pointed end, and as indicated by the dashed line in FIG. The pusher 41 is housed in a housing recess 416 formed in the shaft 413 of the pusher 41 by moving relative to the pusher 41 .

2, the tailstock 42 has a pair of guide rails 423 extending in the Z-axis direction on the bed 11, and a pressing portion 421 and a supporting portion 422 guided by the guide rails 423. and a driving device 424 for reciprocating along the Z-axis direction. Here, the driving device 424 moves the pressing portion 421 and the supporting portion 422 along the guide rail 423, that is, coaxially with the axis O of the main shaft 21 of the headstock 20 by means of a servomotor, a ball screw mechanism, etc. (not shown). It is designed to move back and forth. The operation of the driving device 424 is controlled by the control device 12 of the machine tool 10 .

When pressing the pusher 41 while the pressing portion 421 is housed in the housing recess 416 provided in the shaft 413, the driving device 424 uses, for example, the driving force of the servomotor to move the pressing portion 421 to the first position. It can be pressed by a second pressing force F2 (see, for example, FIG. 5) that is greater than the pressing force F1. By the way, the tailstock 42 is provided on the bed 11 so as to be coaxial with the axis O of the main shaft 21 of the headstock 20, and the pusher 41, as described above, is aligned with the main shaft when placed at the pressing position. It is coaxial with the axis O of the main shaft 21 of the base 20 . Therefore, when the pressing portion 421 of the tailstock 42 presses the pusher 41, the tailstock 42 directs the work W toward the headstock 20 (spindle 21) via the pusher 41 with the second pressing force F2. That is, it presses in the direction of the axis O of the main shaft 21 .

3. Operation of Work Pressing Device 40 Next, the operation of the work pressing device 40 described above will be described. When the workpiece W is to be cut by the machine tool 10, a predetermined tool 37 is selected by turning indexing of the turret device 35, and the machining head 30 is positioned at the machining position. The workpiece W held by the spindle chuck 22 is rotated by the rotational drive of the headstock 20, and the workpiece W is subjected to machining such as outer diameter cutting when the blade of the tool 37 is brought into contact with the workpiece W.

By the way, when the machine tool 10 automatically processes the work W, for example, an automatic work conveying device (not shown) is provided, and the works W are sequentially conveyed from the work stocker. In this case, in order to maintain or improve the machining accuracy of the machining performed on the work W by the machine tool 10, the work W must always be placed at a predetermined position on the headstock 20 (spindle 21). must be properly held and attached to the

Therefore, in the machine tool 10 , the control device 12 first selects the pusher 41 of the work pressing device 40 attached to the tool table 36 by pivoting indexing of the turret device 35 . In this embodiment, the workpiece pressing device 40 is operated to press the workpiece W conveyed and temporarily attached to the main spindle 21, which is a shaft body, to a predetermined position of the main spindle 21 (headstock 20). The workpiece W is pushed in and arranged. A first step in which the pusher 41 presses the workpiece W toward the spindle 21 (headstock 20) and a second step in which the tailstock 42 as an auxiliary pressing device presses the workpiece W pressed by the pusher 41 are performed. will be specifically described.

3-1. First Step In the first step, the control device 12 drives the Z-axis slide 32 and the X-axis slide 34 as shown in FIG. The pusher 41 selected by the extension is positioned at the pressing position. Thereby, the pusher 41 is arranged coaxially with respect to the axis O of the main shaft 21, as shown in FIG.

Subsequently, the control device 12 advances (relatively moves) the Z-axis slide 32 toward the headstock 20, thereby moving the pusher together with the turret device 35 (processing head 30) as indicated by the thick dashed arrow in FIG. 41 is moved relative to the bed 11 in the Z-axis direction, which is a predetermined axial direction. As a result, the guide portion 412 of the pusher 41 accommodates the convex portion W1 of the work W and pushes the work W toward the main shaft 21 while guiding the work W toward the axis O. As shown in FIG. As a result, the workpiece W temporarily attached to the spindle 21 moves relative to the spindle 21 (more specifically, the spindle chuck 22) so as to be coaxial with the axis O.

3-2. Second Step By the way, when the pusher 41 presses the work W as the Z-axis slide 32 advances, for example, depending on the size and shape of the work W, the first pressing force F1 by the spring 414 pushes the work W. A non-pressible situation may arise. That is, in this case, the guide portion 412 and the shaft 413 of the pusher 41 move relative to the base plate 411 rearward in the Z-axis direction against the first pressing force F1 of the spring 414 . As a result, in the turret device 35 (tool table 36) that supports the pusher 41, the load accompanying the pressing of the workpiece W increases.

Therefore, in the present embodiment, the controller 12 controls the tailstock 42 to drive the tailstock 42 when the ON signal is received from the proximity switch 419, in other words, when the load on the tool rest 36 of the turret device 35 increases. Device 424 is activated. That is, in the present embodiment, in a situation where the pusher 41 needs assistance in pressing the workpiece W in the first step, the tailstock 42 as the auxiliary pressing device is operated in the second step to press the workpiece W. Press W.

Specifically, in the second step, the tailstock 42 is directed toward the headstock 20, i.e., the pusher 41 pressing the work W in the Z-axis direction, as indicated by the thick dashed arrow in FIG. Advance. Thereby, as shown in FIG. 5, the pressing portion 421 is housed in the housing recess 416 of the shaft 413 . As the driving device 424 continues to drive, the pressing portion 421 presses the shaft 413, which is the portion to be pressed, via the housing recess 416 with the second pressing force F2.

Here, in the present embodiment, when the control device 12 acquires an ON signal from the proximity switch 419, the Z-axis slide 32, that is, the processing head 30 stops advancing (moving) in the Z-axis direction. As a result, the pusher 41 applies the second pressing force F2 from the tailstock 42 to the first pressing force F1 from the spring 414 without applying an excessive load to the tool rest 36 of the turret device 35 forming the machining head 30. can press the workpiece W.

In this case, since the forward movement of the turret device 35 (processing head 30) stops, the shaft 413 (and the guide portion 412) pressed by the tailstock 42 moves relative to the base plate 411 in the Z-axis direction. move forward to Therefore, since the compression of the spring 414 arranged between the flange portion 413b and the plate member 415 is gradually released, the first pressing force F1 gradually decreases.

On the other hand, the tailstock 42 is driven by a driving device 424 having a servomotor or the like to move forward in the Z-axis direction. , the second pressing force F2 can be greater than the first pressing force F1. Therefore, the pusher 41 is pushed (assisted) by the tailstock 42, so that the guide portion 412 guides the work W to the axis O and pushes the work W toward the predetermined position of the spindle 21. can be pushed in.

Then, for example, when the position of the workpiece W grasped via the push-out device 23 incorporated inside the headstock 20 reaches a predetermined position in the Z-axis direction, the control device 12 operates the spindle chuck 22 to move the workpiece W. , and the mounting of the work W on the headstock 20 is completed. Along with this, the tailstock 42 and the Z-axis slide 32 retreat in the Z-axis direction, thereby separating the pusher 41 from the work W. As shown in FIG. Then, the control device 12 selects the tool 37 for cutting the work W by turning indexing of the turret device 35, and performs machining (cutting) on the work W. As shown in FIG.

As can be understood from the above description, the work pressing device 40 is provided so as to be movable relative to the bed 11 in the Z-axis direction, which is a predetermined axial direction. A pusher 41 that presses the temporarily mounted work W toward the main shaft 21 and a pusher 41 that is provided so as to be relatively movable in the Z-axis direction with respect to the bed 11 . and a tailstock 42 as an auxiliary pressing device that presses toward.

According to this, as the first step, the pusher 41 pushes the work W temporarily mounted on the main shaft 21 toward the main shaft 21, and further, as the second step, the tailstock 42 pushes the work W pressed by the pusher 41. It can be pressed towards the main shaft 21 . Therefore, the work pressing device 40 can press the work W toward the main shaft 21 by eliminating the insufficient pressing of the work W by the pusher 41 through the tailstock 42 through the first process and the second process. .

By resolving the insufficient pressing, the workpiece W can be positioned at a predetermined position on the spindle 21 , and the workpiece W can finally be mounted on the spindle 21 by the spindle chuck 22 . As a result, the work W can be properly mounted at all times, and therefore, for example, the machining accuracy of the work W machined by the machine tool 10 can be maintained and improved.

Furthermore, an existing tailstock 42 (tailstock) provided in the machine tool 10 can be used as an auxiliary pressing device. As a result, there is no need to separately provide an auxiliary pressing device, and, for example, the equipment cost can be reduced.

4. Modification 4-1. First Modification In the embodiment described above, when the tailstock 42 presses the pusher 41 in the second step, the forward movement of the turret device 35 (processing head 30) is stopped. As a result, the workpiece W can be positioned at a predetermined position on the spindle 21 while reducing the load on the tool rest 36 of the turret device 35 . Alternatively, the turret device 35 (processing head 30) can be advanced in synchronism with the advancement of the tailstock 42.

That is, in the second step, the control device 12 moves the Z-axis slide 32, that is, the turret device, in accordance with (in synchronization with) the forward speed of the tailstock 42, as indicated by the thick dashed arrow in FIG. 35 (processing head 30) is continuously advanced in the Z-axis direction. Thereby, the pusher 41 can press the workpiece W by adding the second pressing force F2 from the tailstock 42 to the first pressing force F1 from the spring 414 . Therefore, in the first modified example, the same effect as the embodiment described above can be obtained.

In this case, in the second step, the turret device 35 (processing head 30) continues to advance in synchronism with the tailstock 42, so the spring 414 continues to be compressed by the flange portion 413b of the shaft 413. do. Therefore, the guide portion 412 and the shaft 413 continue to be subjected to the first pressing force F1 by the spring 414 . That is, in the first modified example, unlike the second step of the above-described embodiment, the tailstock 42 pushes the pusher 41 to the first position while the pusher 41 presses the work W with, for example, the maximum first pressing force F1. It can be pressed (assisted) by the second pressing force F2.

4-2. Second Modification In the embodiment and the first modification described above, the pusher 41 of the work pressing device 40 presses the work W as the first step. In the above-described embodiment and first modified example, when an ON signal is obtained from the proximity switch 419, that is, when the load on the tool rest 36 of the turret device 35 increases, the tailstock 42 is turned off as the second step. The work W is pressed through the pusher 41. - 特許庁Alternatively, for example, if it is known in advance that the load on the tool table 36 of the turret device 35 will increase based on the shape and size of the work W, as shown in FIG. The pusher 41 and the tailstock 42 may be connected together to press the work W at the same time.

In the second modification, as the first step, the pusher 41 is arranged at the pressing position so as to be coaxial with the axis O of the headstock 20 (spindle 21), as in the above-described embodiment. Then, as shown in FIG. 7, for example, the control device 12 drives the drive device 424 of the tailstock 42 to move the pressing portion 421 forward in the Z-axis direction to be housed in the housing recess 416 of the pusher 41. The pusher 41 and the tailstock 42 are connected.

In the second modified example, as the second step, for example, the control device 12 synchronously drives the Z-axis slide 32 and the driving device 424 as indicated by the thick dashed arrow in FIG. As a result, the guide portion 412 of the pusher 41 presses the workpiece W toward the spindle 21 while the pusher 41 and the tailstock 42 are connected to each other. In this case, as shown in FIG. 7, the guide portion 412 and the shaft 413 of the pusher 41 are slightly retracted as the workpiece W is pressed, thereby generating a first pressing force F1 and pressing the workpiece W. As shown in FIG. Further, the tailstock 42 is driven by the driving device 424 to generate a second pressing force F2 larger than the first pressing force F1 to press the workpiece W toward the spindle 21 via the pusher 41 . Therefore, in the second modified example as well, the same effects as in the above-described embodiment can be obtained.

4-3. Third Modification In the above-described embodiment and first modification, after the pusher 41 presses the work W in the first step, the tailstock 42 presses the work W via the pusher 41 in the second step. I made it That is, in the above-described embodiment and first modification, the tailstock 42 presses the pusher 41 while the pusher 41 is pressing the work W as shown in FIGS. to press the workpiece W.

Alternatively, for example, as shown in FIG. 4, after the pusher 41 presses the workpiece W in the first step, the control device 12 retracts the pusher 41 attached to the turret device 35 (processing head 30). Then, in the second step, as shown in FIG. 8, it is also possible to directly press the work W after the tailstock 42 has been pressed by the pusher 41 . In this case, as shown in FIG. 8, it is preferable that the convex portion W1 of the workpiece W is provided with a concave portion W2 that accommodates the tip of the pressing portion 421 of the tailstock .

Thus, in the third modification, the pusher 41 presses the work W in the first step, so that the work W is guided toward the axis O of the main shaft 21 to some extent, Placed near the position. In the third modification, in the second step, the tip of the pressing portion 421 of the tailstock 42 is directly accommodated in the concave portion W2 formed in the convex portion W1 of the work W, and the pressing portion 421 presses the work W. Press directly. As a result, the workpiece W becomes coaxial with the axis O and is pushed into a predetermined position on the main shaft 21 to be arranged. Therefore, also in the third modification, the same effects as those of the above-described embodiment and the first modification can be obtained.

4-4. Fourth Modification The proximity switch 419 is provided in the above-described embodiment and each modification. When the control device 12 acquires the ON signal output from the proximity switch 419, the tailstock 42 is automatically operated because the load on the tool base 36 of the turret device 35 is large. By the way, for example, when the operator manually operates the machine tool 10, the proximity switch 419 is omitted, and the tailstock 42 is manually operated based on the operator's judgment in the same manner as in the above-described embodiment and modifications. can also be activated. Therefore, even in the case of the fourth modified example, the same effects as those of the above-described embodiment and each modified example can be obtained.

4-5. Fifth Modification In the above-described embodiment and each modification, the pusher 41 presses the workpiece W with the first pressing force F1 generated by the spring 414 as the turret device 35 (processing head 30) advances, The tailstock 42 presses the workpiece W with a second pressing force F2 generated by a driving device 424 having a servomotor or the like. That is, in the embodiment and each modified example described above, the case where the second pressing force F2 is greater than the first pressing force F1 has been illustrated and explained.

However, the magnitudes of the first pressing force F1 and the second pressing force F2 are not limited to the fact that the second pressing force F2 is larger than the first pressing force F1. That is, if the workpiece W can be pushed into a predetermined position on the spindle 21, the second pressing force F2 applied to the work W by the tailstock 42 is greater than the first pressing force F1 applied to the work W by the pusher 41. can be small. As described above, even in the fifth modified example in which the magnitudes of the first pressing force F1 and the second pressing force F2 are not limited, the same effects as those of the above-described embodiment and each modified example can be expected.

4-6. Sixth Modification In the embodiment and each modification described above, the pusher 41 is assembled to the tool rest 36 of the turret device 35 . As a result, the pusher 41 is provided to be movable relative to the bed 11 in the Z-axis direction, which is a predetermined axial direction, and pushes the workpiece W temporarily mounted on the main shaft 21 toward the main shaft 21 along the Z-axis direction. I made it However, the attachment target of the pusher 41 is not limited to the tool rest 36 of the turret device 35, and may be provided at any location as long as it can press the workpiece W temporarily attached to the spindle 21. FIG. As described above, even in the sixth modified example in which the object to which the pusher 41 is attached is not limited, effects similar to those of the above-described embodiment and each of the modified examples can be expected.

However, when the pusher 41 is provided in addition to the tool table 36 of the turret device 35, it can be moved relative to the bed 11 in the Z-axis direction, which is a predetermined axial direction, and the work W temporarily mounted on the spindle 21 is directed toward the spindle 21. It is preferable that the pusher 41 is provided with a driving device corresponding to the Z-axis slide 32 so that the pusher 41 is pressed. For example, in a machine tool in which the headstock 20 is configured to be movable relative to the bed 11 in the Z-axis direction, which is a predetermined axial direction, there is no need to move the pusher 41, so the driving device can be omitted. is also possible.

4-7. Seventh Modification In the above-described embodiment and each modification, the tailstock 42 is provided with a driving device 424 guided in the Z-axis direction by a pair of guide rails 423, and the driving device 424 drives The pressing part 421 is made to move relative to the bed 11 . Alternatively or additionally, as indicated by the two-dot chain line in FIG. 2, it is also possible to provide an actuator 425 that relatively moves the pressing portion 421 and the supporting portion 422 in the Z-axis direction, which is the predetermined axial direction. is.

In this case also, the pressing portion 421 can press the workpiece W directly or via the pusher 41 by driving the actuator 425 . Therefore, even in the seventh modified example, the same effects as those of the above-described embodiment and each of the above-described modified examples can be obtained.

4-8. Eighth Modified Example In the embodiment and the modified examples described above, the housing recess 416 is provided in the shaft 413 of the pusher 41 , and the pressing portion 421 of the tailstock 42 is housed in the housing recess 416 . This ensures that the pusher 41 and the pressing portion 421 of the tailstock 42 are coaxial with the axis O. As shown in FIG. By the way, the tailstock 42 is provided on the bed 11 so as to be coaxial with the axis O of the main shaft 21 of the headstock 20 . Therefore, when the pressing portion 421 presses the pusher 41, the pusher 41 and the pressing portion 421 can be substantially coaxial with the axis O, although there is a possibility that slight variations may occur. Therefore, it is possible to omit the housing recess 416, and even in this case, the same effects as those of the above-described embodiment and modifications can be expected.

DESCRIPTION OF SYMBOLS 10... Machine tool, 11... Bed, 111... Guide surface, 12... Control device, 20... Headstock, 21... Spindle (shaft), 211... Insertion hole, 22... Spindle chuck, 23... Extrusion device, 30... Machining Head 31 Guide 32 Z-axis slide 33 Guide rail 34 X-axis slide 35 Turret device 36 Tool rest 37 Tool 40 Work pressing device 41 Pusher 411 Base plate , 412...Guide part 413...Shaft 413a...Fixed part 413b...Flange part 414...Spring 415...Plate member 416...Accommodating concave part 417...Slide bearing 418...Collar 419...Proximity switch 42... Tailstock (auxiliary pressing device) 421 Pressing portion 422 Supporting portion 423 Guide rail 424 Driving device 425 Actuator W Work W1 Convex portion W2 Concave portion O axial center

Claims (15)

a pusher that is provided movably relative to the bed in a predetermined axial direction and that presses the workpiece, which is temporarily attached to the shaft along the predetermined axial direction, toward the shaft;
an auxiliary pressing device provided movably relative to the bed in the direction of the predetermined axis, and pressing the work pressed by the pusher along the direction of the predetermined axis toward the shaft. pressing device. 2. The work pressing device according to claim 1, wherein said auxiliary pressing device presses said work toward said shaft by pressing said pusher pressing said work along said predetermined axial direction. 3. The work pressing device according to claim 1, wherein said pusher and said auxiliary pressing device are connected to each other and press said work toward said shaft. The pusher presses the workpiece with a first pressing force,
4. The work pressing device according to claim 1, wherein said auxiliary pressing device presses said work toward said shaft with a second pressing force greater than said first pressing force. The work pressing device according to any one of claims 2 to 4, wherein the pusher has an accommodating recess for accommodating the shaft-shaped pressing portion of the auxiliary pressing device in the pressed portion pressed by the auxiliary pressing device. . 6. The work pressing device according to claim 5, wherein said housing recess is arranged coaxially with the axis of said pusher. The work pressing device according to any one of claims 1 to 6, wherein the pusher has a guide portion that accommodates a convex portion formed on the work and guides the work to the axis of the shaft. Equipped with the work pressing device according to any one of claims 1 to 7,
A machine tool that performs machining on the work positioned at a predetermined position of the spindle, which is the shaft body, by the work pressing device. the pusher is provided on a tool table from which one of a plurality of tools for machining the workpiece can be selected by turning indexing;
9. The machine tool according to claim 8, wherein said auxiliary pressing device is a tailstock for centering said workpiece temporarily mounted on said spindle. 10. The machine tool according to claim 9, wherein the tailstock pushes the work toward the spindle by pushing the pusher pushing the work along the predetermined axial direction. 11. The machine tool according to claim 9, wherein said pusher and said tailstock are connected to each other and press said workpiece toward said spindle. The tailstock presses the work toward the spindle together with the pusher, and after the work is positioned at the predetermined position on the spindle, the work is fixedly mounted on the spindle. A machine tool according to any one of Items 9-11. Applied to the work pressing device according to any one of claims 1 to 7,
a first step in which the pusher presses the workpiece temporarily attached to the shaft toward the shaft along the predetermined axial direction;
and a second step in which the auxiliary pressing device presses the work pressed by the pusher toward the shaft along the predetermined axial direction. In the second step,
14. The method according to claim 13, wherein the auxiliary pressing device presses the work toward the shaft by pressing the pusher, which is pressing the work in the first step, along the predetermined axial direction. Work pressing method described. Applied to the work pressing device according to any one of claims 1 to 7,
a first step of connecting the auxiliary pressing device to the pusher;
and a second step of pressing the workpiece temporarily attached to the shaft toward the shaft while the pusher and the auxiliary pressing device are connected.

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