JP6247531B2 - Tool mounting device for lathe - Google Patents

Description

  The present invention relates to a tool attachment device in a lathe (including a turning center having a function as a lathe) in which a turning tool is detachably attached to a ram by a draw bar mechanism.

  A tool mounting apparatus in a lathe generally has the following configuration.

  A taper-shaped mounting receiving portion that engages with a taper shank provided as a mounting base at the base end of a turning tool is provided in the ram, and a draw bar (clamp shaft) that is advanced and retracted by a draw bar driving device is driven or driven. By pulling by the force, the base end protruding portion provided at the base end of the tapered shank portion of the mounting base portion is locked and pulled, and the tapered shank portion is pulled and engaged with the mounting receiving portion, A draw bar mechanism for detachably attaching the tool to the ram is provided.

  That is, the draw bar is moved forward and backward by the draw bar driving device. For example, when the draw bar (clamp shaft) is pulled by a pulling bias (spring biasing) by a spring, the base end of the taper shank portion is engaged with the engaging portion provided at the tip of the draw bar. The base end protrusion (pull top) provided on the base is locked and pulled, and the taper shank is pulled and engaged with the taper mounting receiving portion at the lower end of the ram to clamp the tool. When the draw bar is pushed by the return drive of the draw bar drive device against this spring bias, the tool is configured to return and be removed.

  In addition, the draw bar may be moved by driving the draw bar drive device (of course, it may be moved in addition to the spring bias), and the draw bar may be driven in the reverse direction, without being configured to pull and clamp by the spring bias. If the tool is driven back (pushing), the tool may be automatically detached or removed (it may be pushed against the spring bias).

  In any case, the tool is pulled and held (clamped) by pulling the draw bar of the draw bar mechanism.

  However, when the turning tool is clamped and fixed in this way, not only the weight of the tool but also a large load is applied during turning.

  That is, since a large cutting force is applied to the tool, a large clamping force is required.

  Therefore, since the draw bar must be pulled with a large pulling force, even if it is pulled by a pulling drive or a spring bias, it is necessary to push the draw bar against the spring bias at the time of release. The drawbar drive device of the drawbar mechanism that performs the drive must use a large-diameter hydraulic cylinder device that can generate a large driving force, and for this reason, there is a hydraulic two-stage cylinder.

  Therefore, the applicant pays attention to the drive source of the tool mounting device in the lathe, which has been a major impediment to the reduction of hydraulic pressure, and breaks the conventional fixed idea so that the tool mounting device in the lathe can be realized even with the air cylinder device. Developed a tool mounting device (Patent No. 3875949, Patent No. 3976676, etc.). That is, even if the wedge mechanism is attached to the drawbar mechanism and the driving force that can be directly opposed to the directly applied large cutting force cannot be generated, the air cylinder device can sufficiently withstand the large cutting force and thereby turn. We have developed a tool mounting device that can reduce the hydraulic pressure without affecting the function and save energy and resources.

  More specifically, when the draw bar (clamp shaft) of the draw bar mechanism is moved and the turning tool is attached and fixed to the ram, a wedge engaging portion is provided in the draw bar or a moving portion that is moved together with the draw bar. A wedge portion that engages with the wedge engaging portion is provided so as to freely advance and retract, and the wedge portion that is advanced and retracted by the wedge driving device is advanced or retracted by driving or urging to press-engage (slide engage) the wedge engaging portion. Thus, a tool mounting device having a wedge mechanism in which the draw clamp fixing position of the draw bar is locked and held has been developed.

  This wedge engaging portion is an engagement gap formed by the moving side forming portion and the fixed portion (fixed side forming portion) of the wedge engaging portion that moves with the movement of the draw bar, and this engagement is achieved by pulling the draw bar. A gap is formed, and the wedge portion is slid into the wedge engaging portion thus formed (formed by pulling) from the side to engage with the wedge, and the drawing position of the draw bar is wedge locked. .

  As a result, the draw bar is pulled, and the locking portion (taper shank portion) of the mounting base is pulled and engaged and fixed to the mounting receiving portion, and the draw bar's drawing clamp fixing position is locked in this way by the wedge mechanism. Therefore, if a large cutting force is applied to this tool during turning, the wedge force that pulled the draw bar or the driving force of the draw bar drive device cannot be directly opposed to this large cutting force. The drawbar's drag clamp fixing position is wedge-locked by the wedge engagement between the wedge engaging portion and the wedge portion of the mechanism, and this force is immediately applied to the wedge engaging portion and the wedge portion even with a large cutting force. Since it does not become a force to release the joint, even if the urging force and driving force for engagement between the wedge engaging portion and the wedge portion are not sufficiently large Also so that the urging force and the driving force for 引動 drawbars even be sufficiently large, may against the sufficiently large cutting forces.

  Therefore, both the draw bar drive device and the wedge drive device can be configured by an air cylinder device, not a hydraulic cylinder device that can generate a large force that can directly face a large cutting force, and the hydraulic pressure can be reduced.

  In other words, since the tool was pulled up directly in the past, a large force opposed to the cutting force was required, but by attaching the wedge mechanism to the draw bar mechanism, the external force and the axial force of the draw bar were achieved by the wedge self-locking mechanism. Therefore, an air cylinder device with a small cylinder thrust is sufficient, which makes it possible to eliminate hydraulic pressure, and the wedge itself prevents the tool from dropping, resulting in excellent safety. It is.

  On the other hand, if higher rigidity is required, that is, in order to attach the turning tool more strongly and engage and fix it to the mounting receiving portion of the ram, the pulling force (clamping force) is further increased. For example, it is desirable that the tool is pulled and engaged and fixed by two-surface restraint.

  Specifically, for example, the draw bar mechanism pulls the draw bar to engage and pull the base end protrusion (pull top) of the mounting base of the turning tool, and the mounting receiver of the ram. The locking portion of the mounting base is pulled and locked, and the locking portion is a first locking portion serving as a first restraining surface and a second locking serving as a second restraining surface. After the taper shank portion as the first locking portion is pulled and engaged with the first receiving portion of the mounting receiving portion of the ram by pulling the draw bar, for example, by a pressure increasing mechanism. By pulling the draw bar with a stronger pulling force with increased pressure, the second locking part is pulled and locked to the second receiving part of the mounting receiving part of the ram, and the turning tool is moved to the ram with a strong pulling force. It is desirable to attach and fix by surface restraint.

  That is, after the first locking portion (taper shank portion) of the tool mounting base is pulled and engaged with the first receiving portion of the ram in this way, the draw bar is further increased in pressure to pull the second locking portion into the second locking portion. It is desirable that the receiving portion is pulled and locked and firmly clamped by two-surface restraint.

  However, it is difficult to realize such a strong pulling force for realizing such two-surface restraint by using an air cylinder device or an electric actuator without using a hydraulic cylinder device.

  On the other hand, the applicant improved a commercially available LM guide to use a linear motion guide (linear motion rail) as a wedge portion, and a slide block provided on the linear motion guide through a ball retainer circulation structure to be wedged. The wedge part which is a linear motion slide is made to slide forward and backward with respect to the wedge engaging part provided with the slide block, and the slide engaging part between the slide block and the linear guide is provided in advance in the joint part. This linear motion guide is provided by providing a pressure-increasing inclined portion that generates an expanding and pressing force in the orthogonal direction by this forward / backward slide (by setting the direction of the slide engagement portion to be inclined with respect to the slide direction). By using the air cylinder device to move the wedge part, the slide block provided in the wedge engaging part is used as a guide to move forward and backward during this time. The slide pressing force by the increase pressure inclined portion, are pressure-increasing converted into expansion pushing force orthogonal thereto, have invented that can produce a large driving force (Japanese Patent No. 4740363).

  However, a large driving force can be generated in a direction perpendicular to this even with a small wedge driving force, but a long stroke cannot be obtained.

  In other words, if the stroke is small, a large pulling force can be obtained by the pressure-increasing conversion by the pressure-increasing inclined portion, but a long stroke is required to drive the drawbar, so a large pulling force is applied to the drawbar of the drawbar mechanism. Cannot be granted.

Japanese Patent No. 3875949 Japanese Patent No. 3976676 Japanese Patent No. 4740363

  In view of such a current situation, the present invention configures the wedge portion by a slide guide body in which the inner wedge portion is slidably provided with respect to the outer wedge portion, and the slide engagement portion is set to be inclined as described above. Thus, as an arrangement for converting the slide pressing force into the expanding pressing force in the orthogonal direction, the applicant's idea that can generate a large driving force in the orthogonal direction is an increase in the pulling force of the draw bar mechanism. A slide that can be used as a mechanism, can be improved, repeated improvements, can overcome the fundamental problem of this idea that a long stroke cannot be obtained, and can obtain a strong pulling force regardless of the hydraulic cylinder device The pressure-increasing mechanism has been successfully incorporated into the wedge mechanism attached to the drawbar mechanism, and the drawbar is moved to slide the wedge portion into the wedge engaging portion. In addition to holding this by engaging, the inner wedge portion of the wedge portion formed by the slide guide body is further advanced and retracted with respect to the outer wedge portion that is slidably fixed to the wedge engaging portion. It is an object of the present invention to provide an epoch-making tool attachment device capable of further pulling a draw bar with converted strong pulling force.

  That is, according to the present invention, the drawbar mechanism allows a sufficient stroke, and the wedge mechanism holds the pulling position where the turning tool mounting base is locked to the ram mounting receiving portion, and the stroke is increased although the stroke is short. A wedge pressure mechanism with a slide guide that generates power is provided in the wedge mechanism, so that even if a weak driving force drive source is used, a strong pulling force can be applied to the drawbar, for example, a strong pulling force is required. Another object of the present invention is to provide a breakthrough lathe tool mounting device that can be mounted and fixed by two-surface restraint by the wedge mechanism including the slide pressure increasing mechanism.

  The gist of the present invention will be described with reference to the accompanying drawings.

  In a lathe provided with a draw bar mechanism 6 that draws and locks the mounting base 3 of the turning tool 1 to the mounting receiving portion 5 provided on the ram 4 by pulling the draw bar 2 and detachably attaches the turning tool 1 to the ram 4. In the tool mounting device, a wedge engaging portion 8 is provided in the draw bar 2 or a pulling portion that is moved together with the draw bar 2, and a wedge portion 9 that engages with the wedge engaging portion 8 is provided so as to be able to advance and retract. When the draw bar 2 of 6 is moved and the mounting base 3 of the turning tool 1 is pulled and locked to the mounting receiving portion 5 of the ram 4, the wedge portion 9 is engaged with the wedge engaging portion 8. And a wedge mechanism 10 that holds the position where the mounting base 3 of the turning tool 1 is attracted and locked to the mounting receiving portion 5 of the ram 4, and the wedge mechanism 10 is engaged with the wedge engaging portion 8. Together The wedge part 9 is constituted by a wedge body provided with an inner wedge part 12 slidably with respect to the outer wedge part 11, and the wedge part 9 is advanced and retracted so that the outer wedge part 11 is connected to the wedge engaging part 8. The inner wedge portion 12 is further slid with respect to the outer wedge portion 11 in the engaged and fixed state, and the outer wedge portion 12 is slid relative to the outer wedge portion 11 with the engagement and fixed. The pressure-increasing inclined portion 13 that presses the wedge portion 11 and the wedge engaging portion 8 to give further pulling force to the draw bar 2 is formed as a slide engaging portion between the inner wedge portion 12 and the outer wedge portion 11. The present invention relates to a tool mounting apparatus in a lathe, characterized in that it is configured to include a slide pressure intensifying mechanism 15 that is provided in the lathe.

Furthermore, said wedge member constituting the wedge portion 9 of the wedge mechanism 10, the to be a direct-acting slide inward wedge portion 12, the ball ball movably accommodated in the ball circulation portion is held by a ball retainer Ruritena via the circulation structure 14, the outer wedge portion 11 to become the slide block constituted by slidably slide guide body engaged, by sliding the slide guide body, wherein a slide block the outer wedge portion The inner wedge 11 is slidably stopped and fixed to the wedge engaging portion 8 by friction or a stopper, and the outer wedge portion 11 is slid and stopped. The wedge portion 12 is further slid and moved to the slide engagement portion between the outer wedge portion 11 and the inner wedge portion 12. The pressure-increasing inclined portion 13 that is narrower and wider toward the slide base end side is provided, and the outer wedge portion 11 and the wedge engaging portion 8 are pressed by the sliding of the inner wedge portion 12 with respect to the outer wedge portion 11. 2. The tool mounting device in a lathe according to claim 1, wherein the wedge pressure mechanism is provided with the slide pressure-increasing mechanism 15 for increasing the pulling force applied to the draw bar 2. .

  In addition, the draw bar mechanism 6 pulls the draw bar 2, thereby locking and pulling the base end protrusion 17 of the mounting base 3 of the turning tool 1, and the mounting receiving portion 5 of the ram 4. The locking portion 18 of the mounting base 3 is pulled and locked, and the locking portion 18 becomes a taper shank portion 19 which is a first locking portion 19 serving as a first restraining surface and a second restraining surface. A position where the taper shank portion 19 as the first locking portion 19 is drawn and engaged with the first receiving portion 21 of the mounting receiving portion 5 of the ram 4 by the pulling of the draw bar 2. Is held by the wedge mechanism 10, and the taper shank portion 20 is applied to the second receiving portion 22 of the attachment receiving portion 5 of the ram 4 by the increased pulling force by the slide pressure increasing mechanism 15 provided in the wedge mechanism 10. And the turning tool 1 is fixed to the ram 4 It is set as the structure fixed by surface restraint, It concerns on the tool mounting apparatus in the lathe of any one of Claim 1,2.

  In addition, the draw bar drive device 7 for driving the draw bar 2 of the draw bar mechanism 6 to pull back or driving against the biasing force for pulling and biasing, and the wedge portion 9 of the wedge mechanism 10 to drive forward or backward, or to advance or retract. The tool mounting on a lathe according to any one of claims 1 to 3, wherein the wedge driving device 16 driven back against the biasing force is constituted by a pneumatic driving device or an electric driving device. It concerns the device.

  Since the present invention is configured as described above, the draw bar mechanism allows a sufficient stroke, and the wedge mechanism keeps the pulling position where the mounting base of the turning tool is locked to the mounting receiving portion of the ram. Although there is a slide pressure-increasing mechanism using a slide guide body that generates increased pulling power in the wedge mechanism, even if a driving source with weak driving force is used, strong pulling force can be applied to the draw bar, for example, Mounting and fixing by two-surface restraint that requires a pulling force is an epoch-making tool mounting device in a lathe that can be realized by the wedge mechanism provided with the slide pressure increasing mechanism.

  Further, in the invention described in claim 2, the present invention can be easily realized, and the tool mounting device in a lathe is further excellent in practicality.

  Further, in the invention described in claim 3, it is an extremely excellent tool attachment device in a lathe capable of attaching and fixing a turning tool to a ram by two-face restraint.

  Further, in the invention described in claim 4, it is possible to realize a hydraulic-less operation and achieve energy and resource savings while having a structure that does not hinder the turning mechanism and can be firmly attached and fixed by, for example, two-sided restraint. It becomes a tool mounting device in a lathe.

  In other words, the hydraulic pressure can be reduced only by adding the slide pressure increasing mechanism, and the hydraulic pressure can be reduced at the minimum cost while maintaining the cutting ability comparable to the hydraulic system.

1 is a schematic configuration external view of the present embodiment. It is a schematic structure explanation front sectional view before the tool attachment fixation of a present Example. It is the time of the tool drawing locking of a present Example, Comprising: It is schematic structure explanatory front sectional drawing before a wedge lock. FIG. 3 is a front sectional view of a schematic configuration illustrating a state before a wedge lock is applied after the tool is pulled and locked according to the present embodiment, and a stronger pulling force is generated by a slide pressure increasing mechanism (before two-surface restraint). FIG. 3 is a front sectional view of a schematic configuration illustrating a state in which a wedge lock is generated after the tool is pulled and locked according to the present embodiment, and a further strong pulling force is generated by a slide pressure increasing mechanism and the tool is firmly attached and fixed by two-surface restraint. It is an explanatory perspective view of a wedge mechanism provided with a slide pressure intensifying mechanism before drawbar pulling of this example. It is an explanatory perspective view of the wedge mechanism provided with the slide pressure increasing mechanism before the wedge lock, at the time of the tool pulling engagement where the draw bar of this embodiment is moved. This slide pressure-increasing mechanism in which the draw bar of the present embodiment is moved to lock the tool after being pulled and locked, and the force is further increased by the slide pressure-increasing mechanism so that the tool is firmly attached and fixed by two-surface restraint. It is an explanation perspective view of a wedge mechanism provided with. It is an explanation front sectional view of a wedge mechanism provided with a slide pressure intensifying mechanism before drawbar pulling of this example. FIG. 5 is an explanatory front sectional view of a wedge mechanism provided with a slide pressure-increasing mechanism prior to wedge locking when the drawing bar of the present embodiment is pulled and locked. The draw bar of this embodiment is moved to lock the wedge after the tool is pulled and locked, and the wedge mechanism having this slide pressure-increasing mechanism before the slide pressure-increasing mechanism generates further strong pulling force (before the two-surface restraint). FIG. This slide pressure-increasing mechanism in which the draw bar of the present embodiment is moved to lock the tool after being pulled and locked, and the force is further increased by the slide pressure-increasing mechanism so that the tool is firmly attached and fixed by two-surface restraint. It is an explanation front sectional view of a wedge mechanism provided with.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  By moving the draw bar 2 by the draw bar mechanism 6, the mounting base 3 of the turning tool 1 is attracted and locked to the mounting receiving portion 5 provided on the ram 4, and further, the wedge mechanism 10 holds the position of the drawing and locking. At the same time, the draw bar 2 is pulled by the increased pulling force by the slide pressure increasing mechanism 15 provided in the wedge mechanism 10 to firmly attach the turning tool 1 to the ram 4.

  That is, when the draw bar 2 of the draw bar mechanism 6 is moved and the attachment base portion 3 of the turning tool 1 is pulled and locked to the attachment receiving portion 5 of the ram 4, the wedge portion 9 is engaged with the wedge engaging portion 8 of the wedge mechanism 10. Is engaged to hold the position where the mounting base portion 3 of the turning tool 1 is attracted and locked to the mounting receiving portion 5 of the ram 4. The wedge portion 9 is an outer side engaged with the wedge engaging portion 8. The wedge part 9 is constituted by a wedge body (slide guide body) provided with an inner wedge part 12 slidably with respect to the wedge part 11, and the outer wedge part 12 is slidably moved with respect to the outer wedge part 11. The pressure-increasing inclined portion 13 to which the drawing bar 2 is pressed by pressing the wedge portion 11 and the wedge engaging portion 8 is applied to the slide engagement between the inner wedge portion 12 and the outer wedge portion 11. As a configuration provided in the joint That (have a set configuration so as to be inclined with respect to the sliding direction of the direction of the slide engaging portion).

  Accordingly, when the wedge portion 9 is advanced and retracted and engaged with the wedge engaging portion 8, the outer wedge portion 11 of the wedge portion 9 is engaged and fixed to the wedge engaging portion 8, and the draw bar 2 is moved. The position where the mounting base portion 3 of the turning tool 1 is drawn and locked to the mounting receiving portion 5 of the ram 4 is wedge-locked. When the outer wedge portion 11 is locked to the wedge engaging portion 8 and the inner wedge portion 12 is further slid relative to the outer wedge portion 11, the outer wedge portion is increased by the pressure-increasing inclined portion 13. 11 and the wedge engaging portion 8 are pressed, and the draw bar 2 is surely given further increased pulling force despite a short stroke.

  For example, when the wedge portion 9 is slidably engaged with the wedge engaging portion 8, the outer wedge portion 11 on at least one side slides to the wedge engaging portion 8 by friction to be engaged and fixed, and the outer wedge portion is fixed. When the inner wedge portion 12 is further slid with respect to the outer wedge portion 11 that is fixedly engaged, with the slide stop being engaged and the 11 is stopped, the pressure-increasing inclined portion 13 (the slide engagement portion is moved in the sliding direction). The sliding force of the inner wedge portion 12 with respect to the outer wedge portion 11 is increased and converted in a direction orthogonal to the outer wedge portion 11, and the outer wedge portion 11 and the wedge portion are thereby reduced. The engaging portion 8 is pressed and further increased pulling force is applied to the draw bar 2.

  Further, for example, the draw bar mechanism 6 is moved by pulling the draw bar 2, so that the base end protrusion 17 of the mounting base 3 of the turning tool 1 is locked and pulled, and the attachment receiving of the ram 4 is performed. The locking portion 18 of the mounting base 3 is pulled and locked to the portion 5, and the locking portion 18 includes a tapered shank portion 19 that is a first locking portion 19 that serves as a first restraining surface, and a second restraining surface. The second locking portion 20 is a taper that is the first locking portion 19 on the first receiving portion 21 of the mounting receiving portion 5 of the ram 4 by the draw bar 2 being pulled by the draw bar mechanism 6. The shank portion 19 is pulled and engaged, and the position where the hook is engaged is held by the wedge mechanism 10, and further, the traction force of the ram 4 is increased by the increased pulling force by the slide pressure increasing mechanism 15 provided in the wedge mechanism 10. A second engagement with the second receiving portion 22 of the mounting receiving portion 5 The attracted and engaged with part 20 can be firmly mounted and fixed by the two-face restraint the turning tool 1 to the ram 4.

  In other words, the wedge mechanism 10 attached to the draw bar mechanism 6 is provided with a slide pressure increasing mechanism 15 having the wedge body 9 constituted by the above-mentioned slide guide body as the wedge portion 9, and the wedge constituted by this slide guide body (wedge body). After the outer wedge portion 11 on at least one side of the portion 9 is once wedge-engaged and wedge-locked to the wedge engaging portion 8, the inner wedge portion 12 is further engaged with the outer wedge portion 11 that is further wedge-locked (sliding stopped). By further sliding, the increased pulling force can be imparted to the draw bar 2, so even if the draw bar 2 requires a long stroke without using a hydraulic cylinder device, the drag bar 2 that has been moved further increases. It becomes possible to apply power, and it is possible to realize strong clamp fixing by two-surface restraint.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, the draw bar 2 is pulled to draw and lock the attachment base 3 of the turning tool 1 to the attachment receiving portion 5 provided on the ram 4 so that the turning tool 1 is detachably attached to the ram 4. A tool mounting device in a lathe provided with a wedge engaging portion 8 provided in the draw bar 2 or a moving portion that is moved together with the draw bar 2, and a wedge portion 9 that engages with the wedge engaging portion 8 can be moved forward and backward. When the draw bar 2 of the draw bar mechanism 6 is pulled and the mounting base portion 3 of the turning tool 1 is pulled and locked to the mounting receiving portion 5 of the ram 4, the wedge engaging portion 8 is engaged with the wedge. A wedge mechanism 10 that holds the position where the mounting base portion 3 of the turning tool 1 is drawn and locked to the mounting receiving portion 5 of the ram 4 by engaging the portion 9 is provided.

  Specifically, in the present embodiment, the draw bar 2 is provided with a draw bar drive device 7 that pulls and pushes the draw bar 2 (drives both forward and backward). The draw bar drive device 7 is a pneumatic drive device. (Air cylinder device). That is, as shown in the figure, for example, a cylinder device that directly drives the draw bar 2 as an advancing / retracting rod is provided, and the draw bar 2 is driven by air pressure by flowing air into one side chamber to attach and remove the turning tool 1 to remove air. It is configured to drive back (push) by air pressure by switching inflow.

  Further, the wedge engaging portion 8 of the wedge mechanism 10 of the present embodiment is formed with a moving side wedge engaging portion that forms the wedge engaging portion 8 at the base end portion of the draw bar 2 that moves forward and backward with respect to the fixed portion (main body portion). In addition to providing the portion 8A, the fixed portion is provided with a fixed-side wedge engaging portion forming portion 8B opposite to the fixed portion, and the draw bar 2 is moved to move the moving-side wedge relative to the fixed-side wedge engaging portion forming portion 8B. The engagement portion 8A is moved to increase the engagement interval, and this interval is configured to be a predetermined interval at which the wedge portion 9 can slide-engage (wedge engagement) from the side.

  That is, for example, when the draw bar 2 is moved by the draw bar driving device 7 and the draw bar 2 is moved to the position where the mounting base 3 of the turning tool 1 is attracted and locked to the mounting receiving portion 5 of the ram 4, the wedge engaging portion 8. That is, the engagement interval between the moving side wedge engaging portion forming portion 8A and the fixed side wedge engaging portion forming portion 8B is a predetermined interval at which the wedge portion 9 can slide-engage, and when the draw position of the draw bar 2 is sensed, The wedge driving device 16 constituted by the pneumatic driving device (air cylinder device) of the wedge mechanism 10 is activated, and the wedge portion 9 is moved between the moving side wedge engaging portion forming portion 8A and the fixed side wedge engaging portion forming portion 8B. It is set as the structure which carries out slide engagement (wedge engagement) in between.

  Further, the wedge portion 9 of the wedge mechanism 10 is constituted by a wedge body provided with an inner wedge portion 12 slidably with respect to an outer wedge portion 11 that slides into and stops the wedge engaging portion 8. The outer wedge portion is further moved in a state where the outer wedge portion 11 is slidably stopped and engaged inside the moving side wedge engaging portion forming portion 8A of the wedge engaging portion 8 by moving the wedge portion 9 back and forth. The inner wedge portion 12 is slid relative to the outer wedge portion 11, and the outer wedge portion 11 and the wedge engaging portion 8 are pressed by the sliding movement of the inner wedge portion 12 with respect to the engaged and fixed outer wedge portion 11. And a slide pressure-increasing mechanism 15 configured to provide a pressure-increasing inclined portion 13 for applying further pulling force to the draw bar 2 in a slide engagement portion between the inner wedge portion 12 and the outer wedge portion 11. Configuration and To have.

  More specifically, the wedge portion 9 of the wedge mechanism 10 is a wedge body (slide guide body) provided with an inner wedge portion 12 slidably with respect to the outer wedge portion 11 engaged with the wedge engaging portion 8. And an increase in the pulling force applied to the draw bar 2 by pressing the outer wedge portion 11 and the wedge engaging portion 8 by the sliding movement of the inner wedge portion 12 with respect to the outer wedge portion 11. The pressure inclined portion 13 is provided in the slide engagement portion between the inner wedge portion 12 and the outer wedge portion 11.

  Accordingly, when the wedge portion 9 is advanced and retracted and engaged with the wedge engaging portion 8, the outer wedge portion 11 of the wedge portion 9 slides inside the moving side wedge engaging portion forming portion 8 </ b> A of the wedge engaging portion 8. When the draw bar 2 is pulled and the mounting base 3 of the turning tool 1 is drawn and locked to the mounting receiving portion 5 of the ram 4, the lock is locked. When the outer wedge portion 11 is locked to the wedge engaging portion 8 and the inner wedge portion 12 is further slid relative to the outer wedge portion 11, the outer wedge portion is increased by the pressure-increasing inclined portion 13. 11 and the wedge engaging portion 8 are pressed to further increase the pulling force to the draw bar 2.

  That is, when the wedge portion 9 is slidably engaged with the wedge engaging portion 8, in this embodiment, the outer wedge portion 11 on one side is brought into contact with the moving side wedge engaging portion forming portion 8A of the wedge engaging portion 8 by friction. When the outer wedge part 11 is slid and stopped, the outer wedge part 11 is slid and stopped, and the inner wedge part 12 is further slid relative to the outer wedge part 11, the pressure-increasing inclined part 13 is moved. As a result, the sliding pushing force of the inner wedge portion 12 with respect to the outer wedge portion 11 is increased and converted in a direction orthogonal thereto, and the outer wedge portion 11 and the wedge engaging portion 8 are pushed and further applied to the draw bar 2. The increased pulling power is configured to be applied.

  In this embodiment, the draw bar 2 is moved to lock and move the base end protrusion 17 of the mounting base 3 of the turning tool 1 and to the mounting receiving portion 5 of the ram 4. The locking portion 18 of the mounting base 3 is configured to be pulled and locked. The locking portion 18 includes a taper shank portion 19 serving as a first locking portion 19 serving as a first restraining surface and a second restraining surface serving as a second restraining surface. The two locking portions 20 are used.

  Therefore, in this embodiment, the drawbar mechanism 6 pulls and engages the tapered shank portion 19 as the first locking portion 19 with the first receiving portion 21 of the attachment receiving portion 5 of the ram 4 by the pulling of the drawbar 2. The position of the draw engagement is held by the wedge mechanism 10, and further, the ram 4 is slightly deformed or moved by the increased pulling force generated by the slide pressure increasing mechanism 15 provided in the wedge mechanism 10. The second locking portion 20 (abutting surface) is also attracted and locked to the second receiving portion 22 (tip surface of the ram 4) of the mounting receiving portion 5 so that the turning tool 1 is constrained to the ram 4 in two planes. It can be fixed and fixed more firmly.

  In other words, the wedge mechanism 10 attached to the draw bar mechanism 6 is provided with a slide pressure increasing mechanism 15 having the wedge body 9 constituted by the above-mentioned slide guide body as the wedge portion 9, and the wedge constituted by this slide guide body (wedge body). After the outer wedge portion 11 of the portion 9 is once wedge-engaged with the wedge engaging portion 8 and wedge-locked, the inner wedge portion 12 is further wedge-driven with respect to the outer wedge portion 11 that is further wedge-locked (sliding stopped). Since the increased pulling force can be imparted to the draw bar 2 by sliding with the device 16, the draw bar drive device 7 and the wedge drive device 16 are configured using an air cylinder device or an electric actuator, thereby reducing hydraulic pressure. Even if the drawbar 2 requires a long stroke without using a hydraulic cylinder device as much as possible, the increased powerful pulling force (completely inferior to the hydraulic system) Not it is possible to impart a strong 引動 force), rigid clamping by the two-face restraint is to be realized.

More specifically, the wedge body constituting the wedge portion 9 of the wedge mechanism 10 according to the present embodiment is configured such that a ball is held by a ball retainer on a linearly moving slide that becomes the inner wedge portion 12, and inside the ball circulation portion. movably through the housing have been ball Ruritena circulation structure 14, whereas the side outside slide said outer wedge portion 11 to become the slide block slidably engage the (moving side wedge engaging portion forming portion 8A side) It consists of a guide body.

Similarly, an outer rail portion 23 that is slidable via a ball retainer circulation structure 14 is provided on the outer side of the opposite side (fixed side wedge engaging portion forming portion 8B side). Is fixed to the fixed side wedge engaging portion forming portion 8B of the wedge engaging portion 8 in advance, and the slide guide body (the outer wedge portion 11 and the inner wedge portion 12) is slid along the outer rail portion 23. The wedge engaging portion 8 (between the fixed side wedge engaging portion forming portion 8B and the moving side wedge engaging portion forming portion 8A) is slidably engaged, and the slide guide body is slid to the wedge engaging portion 8. If is, the sliding block the outer wedge portion 11 is a click is the wedge engagement portion 8 stops slides (moving side wedge engaging portion forming portion 8A inside) and engagement fixed by friction, the outer wedge portion 11 Sura The inner wedge portion 12 that is the linear motion slide is further slid along the outer rail portion 23 with respect to the outer wedge portion 11 in the idling stopped state, and the outer wedge portion 11 and the inner wedge portion The pressure-increasing inclined portion 13 that is narrower toward the slide distal end side and wider toward the slide proximal end side is provided in the slide engagement portion with the outer wedge portion 11 by sliding the inner wedge portion 12 with respect to the outer wedge portion 11. In addition, the wedge mechanism 10 is provided with a slide pressure increasing mechanism 15 in which the wedge engaging portion 8 is pressed and a further increased pulling force is applied to the draw bar 2.

  That is, in other words, in this embodiment, the wedge engaging portion 8 is constituted by the moving side wedge engaging portion forming portion 8A and the fixed side wedge engaging portion forming portion 8B, and is fixed to the fixing portion (main body portion). With respect to the side wedge engaging portion forming portion 8B, the movement side wedge engaging portion forming portion 8A moves along with the draw bar 2 along with the draw bar 2 by the pulling of the draw bar 2, and this moving side wedge engaging portion forming portion is moved. The distance between 8A and the fixed side wedge engaging portion forming portion 8B increases. When the draw bar 2 is pulled to a predetermined position and the position where the mounting base 3 of the turning tool 1 is attracted and locked to the mounting receiving portion 5 of the ram 4 is sensed, this interval (engagement interval) formed at a predetermined interval is detected. That is, the wedge portion 9 is driven to slide by the wedge driving device 16 from the lateral direction to the wedge engaging portion 8 (moving side wedge engaging portion forming portion 8A and fixed side wedge engaging portion forming portion 8B). It is configured to do.

  The wedge portion 9 is constituted by a slide guide body in which the outer wedge portion 11 and the inner wedge portion 12 are slidably engaged as described above, but in this embodiment, the movement side wedge engaging portion forming portion 8A side is formed. Is composed of the outer wedge portion 11, and the outer rail portion 23 is fixed in advance as a slide rail to the fixed-side wedge engaging portion forming portion 8 B, and the inner wedge portion 12 is slidably engaged with the outer rail portion 23. The wedge part 9 (slide guide body) in which the outer wedge part 11 and the inner wedge part 12 move together is slid along the outer rail part 23 and slidably engaged with the wedge engaging part 8. It is configured.

  More specifically, the outer wedge portion 11 and the inner wedge portion 12 are slidably engaged via a ball retainer circulation structure 14, and the inner wedge portion 12 is engaged with the outer rail portion 23 via the ball retainer circulation structure 14. Engageably slidably and urged by a spring so as to slide together when the outer wedge portion 11 and the inner wedge portion 12 are slidably engaged along the outer rail portion 23. An integrated slide mechanism 26 is provided that presses the outer wedge part 11 in the slide movement direction by the pressing part 28 and holds (presses) against the stopper part 25 provided on the inner wedge part 12.

  In this manner, the integrated wedge portion 9 (slide guide body) is slidably engaged with the wedge engaging portion 8 without rattling during sliding, and the outer wedge portion 11 slides on the moving side wedge engaging portion forming portion 8A. After stopping, the inner wedge portion 12 is further slid by the wedge driving device 16 with respect to the outer wedge portion 11.

  In other words, the outer rail portion 23 is fixed to the fixed-side wedge engaging portion forming portion 8B of the fixed portion, and the outer wedge portion 11 and the inner wedge portion 12 are joined by the integrated slide mechanism 26 along the outer rail portion 23. In the integrated state, the moving side wedge is formed between the moving side wedge engaging portion forming portion 8A and the fixed side wedge engaging portion forming portion 8B, that is, along the outer rail portion 23 of the fixed side wedge engaging portion forming portion 8B. After the outer wedge portion 11 and the inner wedge portion 12 are slid into the engagement portion forming portion 8A and the outer wedge portion 11 is frictionally stopped, the inner wedge portion 12 is further slightly slid and moved.

  More specifically, in this embodiment, the stopper may be stopped, but an inclined receiving surface portion 27 for locking the slide is provided inside the moving side wedge engaging portion forming portion 8A, and the outer wedge portion is provided on the inclined receiving surface portion 27. The outer surface of 11 is slidably locked by friction and stops sliding. The slide engagement part between the outer wedge part 11 and the inner wedge part 12 is not parallel to the slide direction, and the slide tip side is narrow. The inner wedge portion 12 is provided with the pressure-increasing inclined portion 13 that is set to the slide engaging portion that is gently inclined by setting both engagement-side end shapes so that the slide base end side gradually becomes wider. Is moved to the outer wedge part 11 by the sliding movement of the outer wedge part 11 in the orthogonal direction, that is, the strong pull that is increased on the draw bar 2 by the expanding force that presses the moving wedge engaging part forming part 8A. Power is given It is configured to.

  That is, the structure for obtaining the increased pulling force by the slide pressure-increasing mechanism 15 by the pressure-increasing inclined portion 13 cannot be employed as it is in the draw bar mechanism 6 that requires a long stroke. Even if this slide increase is achieved, the wedge position is wedge-locked (temporarily held) by the wedge mechanism 10 and the slide mechanism 15 is incorporated into the wedge mechanism 10 so as to be independent of the drawbar mechanism 6. Even if the pressure increase by the pressure mechanism 15 is based on a minute stroke, an innovative structure capable of additionally applying the increased pressure force to the draw bar 2 has been created.

  Furthermore, it is a tool mounting device that can realize two-side restraint by applying a pressure increase by a small stroke while temporarily tightening the drawn drawbar 2 with a wedge lock. The draw bar mechanism 6 having a pulling force realizes strong clamping by two-surface restraint.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Turning tool 2 Draw bar 3 Mounting base 4 Ram 5 Mounting receiving part 6 Draw bar mechanism 7 Draw bar drive device 8 Wedge engagement part 9 Wedge part
10 Wedge mechanism
11 Outer wedge part
12 Inside wedge part
13 Inclination for pressure increase
14 Ball retainer circulation structure
15 Slide pressure increase mechanism
16 Wedge drive
17 Base end protrusion
18 Locking part
19 First locking part (taper shank part)
20 Second locking part
21 First department
22 Second receiving part

Claims (4)

  In the tool mounting apparatus in a lathe equipped with a draw bar mechanism that draws and locks the mounting base of the turning tool to the mounting receiving portion provided on the ram by pulling the draw bar and detachably attaches the turning tool to the ram, the draw bar or A wedge engaging portion is provided in a moving portion that is moved together with the draw bar, and a wedge portion that engages with the wedge engaging portion is provided so as to be movable forward and backward, and the draw bar of the draw bar mechanism is moved to attach the turning tool. When the base portion is pulled and locked to the mounting receiving portion of the ram, the mounting portion of the turning tool is pulled and locked to the mounting receiving portion of the ram by engaging the wedge portion with the wedge engaging portion. A wedge mechanism that holds the position, and the wedge mechanism is provided with an inner wedge portion that is slidable with respect to an outer wedge portion that engages with the wedge engaging portion. The wedge part comprises the wedge part, the wedge part is advanced and retracted, and the outer wedge part is engaged with and fixed to the wedge engaging part, and the inner wedge part is further slid with respect to the outer wedge part. It is configured to move, and for the pressure increase that further pulling force is applied to the draw bar by pressing the outer wedge portion and the wedge engaging portion by the sliding movement of the inner wedge portion with respect to the outer wedge portion fixedly engaged. A tool mounting apparatus in a lathe, characterized in that a tilting portion is provided with a slide pressure-increasing mechanism configured by providing a slide engaging portion between the inner wedge portion and the outer wedge portion. Said wedge member constituting the wedge part of the wedge mechanism, the become linear slide inward wedge, ball via a movably housed a ball Ruritena circulation structure in the ball circulation portion is held by the ball cage , said outer wedge portion to become the slide block constituted by slidably slide guide body engaged, said this when the slide guide body is slid, said a sliding block the outer wedge portion friction or stop wedge In this state, the inner wedge portion, which is the linear motion slide, is further slid to the outer wedge portion in a state where the outer wedge portion is slid and stopped. The slide engagement portion between the outer wedge portion and the inner wedge portion is narrower toward the slide tip side and the slide proximal side The pressure-increasing inclined portion that is wide is provided, and the outer wedge portion and the wedge engaging portion are pressed by the sliding of the inner wedge portion with respect to the outer wedge portion, and further pulling force is applied to the draw bar to increase the pressure. The tool mounting device in a lathe according to claim 1, wherein the slide pressure increasing mechanism is provided in the wedge mechanism.   The draw bar mechanism moves the draw bar by locking the base end protrusion of the mounting base of the turning tool and pulls the mounting base on the mounting receiving portion of the ram. It is configured to draw and lock, and the locking portion includes a taper shank portion that is a first locking portion that is a first restraining surface and a second locking portion that is a second restraining surface, The wedge receiving mechanism holds the position where the taper shank portion that is the first locking portion is drawn and engaged with the first receiving portion of the mounting receiving portion of the ram, and the second receiving portion of the mounting receiving portion of the ram. The taper shank portion is attracted and locked by the increased pulling force by the slide pressure increasing mechanism provided in the wedge mechanism, and the turning tool is fixedly attached to the ram by two-face restraint. You Tool mounting apparatus in a lathe according to any one of claims 1 and 2.   A drawbar drive device that drives the drawbar of the drawbar mechanism to pull back or drive back against the biasing force that pulls and biases, and a biasing force that drives the wedge part of the wedge mechanism to advance or retreat or bias forward and backward 4. The tool mounting device in a lathe according to claim 1, wherein the wedge driving device that is driven back is configured by a pneumatic driving device or an electric driving device. 5.

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