JP4255669B2 - Automatic lathe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic lathe.
[0002]
[Prior art]
As a conventional automatic lathe, there is one described in Patent Document 1, for example. The automatic lathe described here is of a main shaft moving type, and a support stand extending on a plane orthogonal to the moving direction of the main shaft is provided at a fixed position with respect to the machine base. A dovetail groove extending in the first direction orthogonal to the moving direction of the main shaft is formed as a guide member on the front surface of the machine base, and a plate-like movable body (base member) can be moved in the same direction by the dovetail groove. To support.
[Patent Document 1]
JP 2001-18101 A
[0003]
As other guide members for supporting the base member in such an automatic lathe so as to be movable, there are a rolling guide and a sliding guide such as a linear guide, and the one having the above-mentioned dovetail is known as one of the sliding guides. ing. On the other hand, a first base member attached to the gantry and movable in a predetermined first direction with respect to the gantry, and a second base member attached to the first base member and movable in a direction orthogonal to the first direction There is an automatic lathe with a tool post with which it is equipped. In this automatic lathe, the cutting tool is moved in the first direction by moving the first base member, and the cutting tool is moved in the second direction by moving the second base member.
[0004]
[Problems to be solved by the invention]
In such an automatic lathe, the manner in which the first base member is attached to the gantry and the second base member is attached to the first base member via a dovetail groove, which is an example of a sliding guide, is shown in FIG. The one shown in FIG. 7 can be considered.
In the tool post 50 in the first mode shown in FIG. 6, a first dovetail groove 52 is formed on the vertical surface of the gantry 51 along the depth direction of the paper surface and along the horizontal direction. A base member 53 is attached. The sliding surface 52b of the first dovetail groove 52 is disposed along the vertical direction, and the first base member 53 is attached to the side of the mount 51 side by side. A second dovetail groove 54 is formed in the first base member 53 along the vertical direction, and the second base member 55 is attached to the first base member 53 via the second dovetail groove 54. In addition, a servo motor for controlling movement of the second base member 55 is also attached to the first base member 53. On the other hand, a tool 56 or the like that is a tool is attached to the second base member 55.
A servo motor (not shown) for controlling movement of the first base member 53 is further attached to the gantry 51 in the direction of the first dovetail groove 52. A feed screw 46 is connected to the rotation shaft of the servo motor coaxially therewith, and a feed nut 45 screwed with the feed screw 46 is provided on the first base member 53. The feed screw 46 is provided near the first dovetail groove 52 and substantially at the center of the guide surface interval of the first dovetail groove 52 in consideration of the balance of the sliding resistance of the first dovetail groove 52.
Thus, in this example, the dovetail groove 52 and the feed screw 46 are offset from the cutting point at which the cutting tool 56 cuts the material by the distances A2 ′ and A2 in the axial direction of the spindle and toward the headstock, respectively. It is the composition arranged at the position.
[0005]
On the other hand, in the tool post 60 in the second mode shown in FIG. 7, a first dovetail groove 62 is formed on the horizontal surface of the gantry 61 along the depth direction and the horizontal direction of the drawing surface. A base member 63 is attached. The first dovetail groove 62 has a sliding surface 62 b disposed along the horizontal direction, and is attached in such a manner that the first base member 63 is placed on the mount 61. A second dovetail groove 64 is formed in the first base member 63 along the vertical direction, and the second base member 65 is attached via the second dovetail groove 64 in the same manner as in the first embodiment. . Further, a servo motor for controlling movement of the second base member is also attached to the first base member. On the other hand, a tool such as a tool 65 is attached to the second base member 65.
A servo motor (not shown) for controlling the movement of the first base member 63 is further attached to the gantry 61 in the direction of the first dovetail groove 62. A feed screw 46 is connected to the rotation shaft of the servo motor coaxially therewith, and a feed nut 45 screwed with the feed screw 46 is provided on the first base member 63. The feed screw 46 is provided near the first dovetail groove 62 and at the approximate center of the guide surface interval of the first dovetail groove 62 in consideration of the sliding resistance balance of the first dovetail groove 62.
Thus, in this example, the dovetail groove 62 and the feed screw 46 are offset from the cutting point at which the cutting tool 56 cuts the material by the distances A3 ′ and A3 in the direction orthogonal to the main shaft axis and upward, respectively. In addition, it is configured to be disposed at a position offset by a distance B3 in the direction of the main shaft axis and also on the main shaft side.
[0006]
Generally, when turning using the cutting tool 56, the cutting tool 56 is moved by moving back and forth in the main axis direction. At the time of cutting, a main component force Fy, a feed component force Fz, and a back component force Fx act on the tip of the cutting tool 56. In this case, the rigidity necessary for guiding and supporting the cutting tool 56 is given to the second base members 55 and 65 and then supported by the first base members 53 and 63. The guide surfaces of the members 55 and 65 are located deeper toward the headstock than the cutting point at which the cutting tool 56 cuts the workpiece. In addition, the first base members 53 and 63 that support the second base members 55 and 65 with respect to the gantry 51 and 61 are used to input loads and the like from the second base members 55 and 65 and the bite 56 as described above. Since sufficient rigidity is required, the guide surfaces of the first base members 53 and 63 are further recessed toward the headstock side than the guide surfaces of the second base members 55 and 65. For this reason, the dovetail grooves 52 and 62 provided to guide the first base members 53 and 63, and the offset distance from the feed screw 46 to the above-described cutting point become very large. As a result, the dovetail grooves 52 and 62 are formed. The moment applied to the guide surface is also very large.
[0007]
After all, when the offset distance is large as described above, the moment becomes very large, so that it is difficult to sufficiently secure the support rigidity of the cutting tool 56. As a result, there is a concern that it becomes difficult to design a machine capable of processing with high accuracy. Moreover, if it is intended to secure the support rigidity on the assumption of these structures, it is necessary to increase the size of the dovetail, which may result in an increase in the size of the device. If the device becomes larger, the offset distance increases, and it may be necessary to devise to further improve the rigidity.
[0008]
Accordingly, an object of the present invention is to provide an automatic lathe capable of preventing the increase in size of the base member, reducing the overall size, and reducing the load applied to the guide structure such as the dovetail. is there.
[0009]
[Means for Solving the Problems]
  An automatic lathe according to the present invention that has solved the above problems includes a spindle that grips a workpiece and rotates the workpiece around a predetermined Z-axis, a bite holder that holds a tool for machining the workpiece, and a bite holder that extends in the Z-axis direction. A first guide member that moves and guides in the orthogonal Y-axis direction, a first base member that is provided on the gantry via the first guide member and is movable relative to the gantry in the Y-axis direction, and a tool holder A second guide member that moves and guides in the X-axis direction orthogonal to the Z-axis direction and the Y-axis direction, and is provided on the first base member via the second guide member, and is movable in the X-axis direction. And a guide surface of the first guide member is formed so as to be inclined with respect to an XY plane including the X axis and the Y axis.
  The first guide member is provided on one of the first base member and the gantry and on the other of the first base member and the gantry, is fitted in the ant groove, and is movable along the dovetail. And a protruding member.
[0010]
  in this wayWith toolsSince the moment applied to the first guide member when machining the workpiece can be reduced, the burden on the first guide member during machining can be reduced. For this reason, abrasion of the 1st guide member can be prevented suitably.
[0011]
Further, the automatic lathe includes a cutting point of a tool for machining the workpiece when the first guide member is disposed in a horizontal direction or a vertical direction, and a feeding unit that moves the first base member in the first direction. The distance in the height direction of the first guide member between the cutting point of the tool for machining the workpiece and the point of action of the feeding means is shorter than the distance in the height direction of the first guide member from the point of action. As described above, the inclination angle and the position of the action point of the feeding means are set.
Thus, by reducing the distance between the action point and the cutting point, the amount of moment that is applied to the guide surface of the first guide member can be further reduced.
[0012]
Furthermore, in the automatic lathe, the first guide member is provided with a sliding guide.
As described above, in the automatic lathe according to the present invention, the first base member is attached to be inclined with respect to the gantry. In addition, by using the sliding guide, it becomes possible to receive the weight of the first and second base members in a wide area, and the weight is intensively applied to a part of the first guide member. Can be prevented. For this reason, it is possible to suitably prevent wear of the first guide member. Moreover, since the area ratio which a 1st base member occupies in a machine longitudinal direction can be made low compared with the case where the guide surface of a 1st guide member is arrange | positioned in a horizontal direction, it can contribute to size reduction of the whole apparatus. Is.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension ratio of drawing does not necessarily correspond with the thing of description.
[0014]
1 is a side view of an automatic lathe according to an embodiment of the present invention, FIG. 2 is a side view of a tool rest in the automatic lathe, FIG. 3 is a front view of the tool rest, and FIG. 4 is a plan view of the tool rest. As shown in FIG. 1, an automatic lathe 1 according to this embodiment includes a bed 2. On the bed 2, a headstock 3, a tool post 4, and a back attachment 5 are provided.
[0015]
A spindle 11 is installed on the spindle stock 3. A chuck 12 for holding a bar is provided on the tip end side of the main shaft 11, and holds a bar serving as a workpiece to be cut. A spindle (not shown) is disposed inside the main shaft 11, and the rod held by the chuck 12 is rotated about the axis by driving the spindle. A bar supply device is provided outside the machine behind the main shaft 11. The bar supply device has a finger chuck at the tip of the feed arrow, and is fixed by pinching the rear end of the bar with the finger chuck. The bar is urged forward through In addition, a first guide rail 13 extending in the Z-axis direction is laid at a position where the headstock 3 is installed in the bed 2, and a first runner block 14 is attached to the lower surface of the headstock 3. ing. The first runner block 14 is fitted into the first guide rail 13 and drives the servo motor, so that the first runner block 14 moves along the first guide rail 13, and the spindle 11 installed on the spindle stock 3. Etc. move in the Z-axis direction.
[0016]
  The tool post 4 is shown in FIGS.FIG.As shown also in FIG. The base 21Bed 2It is mounted in a fixed state, and its upper surface is formed as an inclined surface that is inclined obliquely. In the present embodiment, the angle of the inclined surface is set to 60 degrees. A first dovetail groove 22 constituting a part of the first guide member of the present invention having a trapezoidal cross section is formed on the upper surface of the gantry 21. Further, the first dovetail groove 22 is provided with a lateral load charge portion 22a and a sliding surface 22b. The longitudinal direction of the first dovetail groove 22 extends along the Y-axis direction (horizontal direction). Further, a guide bush 23 is provided at a lower position of the gantry 21, and a main shaft passage portion through which the main shaft 11 passes is formed behind the guide bush 23 (left side in the drawing). The main shaft passage portion passes through the gantry 21 along the Z-axis direction, and the axis of the main shaft 11 passes through the central hole portion of the guide bush 23. Accordingly, the bar held by the main shaft 11 is guided to the guide bush 23 as it is. Each axis of the bar gripped by the main shaft 11 and the workpiece formed at the tip of the bar coincides with the axis of the main shaft 11.
  Further, the gantry 21 is provided with a servo motor (not shown). A feed screw 46 formed to have substantially the same length as the depth direction of the gantry 21 is supported by the gantry 21 via a cantilever bracket (not shown) provided on the gantry 21. By driving the servo motor, the feed screw 46 connected to the motor rotation shaft of the servo motor is rotated. A first base member 25, which will be described later, is driven by a feed screw 46 that is screwed into a feed nut 45 provided on the first base member 25, and slides on the sliding surface 22b in a predetermined first direction, the Y-axis direction. It is moved along the first dovetail groove 22.
[0017]
  A first base member 25 is provided on the inclined surface of the gantry 21. The first base member 25 is provided with a first protrusion 26 having a trapezoidal cross section that constitutes a part of the first guide member. The cross-sectional shape of the first protrusion 26 has a base angle that is the same as the base angle of the cross-sectional shape of the first dovetail groove 22, and the top and bottom sides are shorter than the cross-sectional shape of the first dovetail groove 22. There is no. A first protrusion 26 is inserted into the first dovetail groove 22, and a first spacer 27 is inserted in the space between the first dovetail groove 22 and the first protrusion 26. The first spacer 27 has a parallelogram-shaped cross section that fills the space between the first dovetail groove 22 and the first protrusion 26, and the first spacer 27 is between the first dovetail groove 22 and the first protrusion 26. The first protrusion 26 is fitted into the first dovetail groove 22 by inserting 27. The first spacer 27 is disposed in the upper part of the first dovetail groove 22. In this way, the first spacer 27 isOf the first dovetail 22By arranging in the upper part instead of the lower part, the replacement work for replacing the first spacer 27 or the first dovetail groove 22 itself when the sufficient guide accuracy cannot be obtained due to wear or the like is easy. Can be done. When the replacement work of the first spacer 27 is performed, at least the first base member 25 is fixed to the gantry 21 by the jig J among movable parts such as the first base member 25 as shown in FIG. By using the jig in this way, the first protrusion 26 is pressed against the first dovetail groove 22 so that a space for extracting the first spacer from the arrangement space can be defined. It is possible to prevent the first base member 25 from dropping from the gantry 21.
[0018]
The surface of the first base member 25 forms an XY plane that is orthogonal to the Z axis and extends along the vertical line. On the surface of the first base member 25, as shown in FIG. 4, a second dovetail groove 28 having a trapezoidal cross section constituting a part of the second guide member is formed. The second dovetail groove 28 has the same cross-sectional shape as that of the first dovetail groove 22 and is formed along the X-axis direction (vertical direction). Further, a servo motor 29 is provided above the first base member 25. The servo motor 29 moves a second base member 30 (to be described later) along the second dovetail groove 28 in the X-axis direction, which is a predetermined second direction orthogonal to the Y-axis direction.
[0019]
A second base member 30 is attached to the surface of the first base member 25, and the second base member 30 is provided with a second protrusion 31 having a trapezoidal cross section that constitutes a part of the second guide member. It has been. The cross-sectional shape of the second protrusion 31 is the same as the cross-sectional shape of the first protrusion 26. A second protrusion 31 is inserted into the second dovetail groove 28, and a second spacer 32 is inserted between the second dovetail groove 28 and the second protrusion 31. The second spacer 32 has the same shape as the first spacer 27. The second protrusion 31 is fitted into the second dovetail groove 28 by inserting the second spacer 32 between the second dovetail groove 28 and the second protrusion 31.
[0020]
In addition, a tool holder 33 is provided on the surface of the second base member 30. An appropriate number, six bytes B1 to B6 are attached to the tool holder 33 in the present embodiment. A predetermined seating reference surface is set on the tool holder 33, and the tools B1 to B6 are attached along the seating reference surface, whereby accurate positioning is performed. By using these cutting tools B1 to B6 while appropriately selecting and exchanging them, the workpiece at the tip end portion of the bar which is held and rotated by the main shaft 11 and guided by the guide bush 23 is processed. In order to selectively replace the cutting tools B1 to B6 used in the processing, the first base member 25 is moved and selected, and the second base member 30 is moved and moved to the standby position. ing. Furthermore, a tool holder 24 is provided at the center in the height direction of the second base member 30. The tool holder 24 is formed so as to protrude from the surface of the second base member 30 to the back attachment side, and holds a plurality of, in the present embodiment, four drilling tools D1 to D4. These drilling tools D1 to D4 are used for front drilling. A workpiece is processed and formed at the tip of the bar by using these cutting tools B1 to B6 and drilling tools D1 to D4.
[0021]
Further, the second base member 30 is provided with a breakage detecting device 34 for detecting breakage of the parting tool. The breakage detection device 34 has a plate-like drive plate 34A, and an upper end portion of a detection rod 34B, which is a rod-like detector having a crank shape bent at an intermediate position, is attached to the drive plate 34A. ing. Further, the breakage detection device 34 has a proximity sensor (not shown) and the like. When the first base member 25 and the second base member 30 are moved after the parting process is completed, the proximity sensor reacts when the detection bar 34B comes into contact with the workpiece, and the parting tool is damaged. Detect that
[0022]
The back attachment 5 includes an attachment main body 41, and a work holding portion 42 that holds the cut workpiece by cutting with the cutting tools B <b> 1 to B <b> 6 is provided in front of the attachment main body 41. Further, a second guide rail 43 is laid on the bed 2 at a position where the attachment main body 41 is provided, and a second runner block 44 is attached to the lower surface of the attachment main body 41. The second runner block 44 is fitted into the second guide rail 43 and drives the servo motor, whereby the second runner block 44 moves along the second guide rail 43, and the attachment main body 41 and the work provided thereon The holding part 42 moves in the Z-axis direction.
[0023]
A chute 6 is provided between the back attachment 5 and the tool post 4. The workpiece processed by the cutting tools B1 to B6 and the drilling tools D1 to D4 provided on the tool post 4 is collected through the chute 6.
[0024]
A mechanism for achieving the operation of the automatic lathe according to the present embodiment having the above configuration will be described with reference to FIGS. 5, 6, and 7.
[0025]
First, the relationship between the cutting point P1 when cutting with the cutting tool 56 and the load application point P2 with the feed screw 46 will be described with reference to FIG. The offset distance between the load application point P2 and the cutting point P1 is A1. A reaction force equal to the main component force Fy of the bite is generated from the feed screw 45 at the load application point P2. In this case, the balance equation of the moment by the main component force Fy is as follows.
[0026]
My1a = Fy * A1
My1b = Fy * B1
For comparison, in the automatic lathe of the form shown in FIGS.
My2a = Fy * A2 My2b = Fy * B2
My3a = Fy * A3 My3b = Fy * B3
In the illustrated structure drawn on the premise that the normal design requirements are satisfied,
A1 <A2 <A3 and B1≈B2 <B3
∴My1a <My2a <My3a, My1b≈My2b <My3b
It becomes. That is, as compared to the comparative example, in the embodiment of the present invention, the moment generated by the main component force Fy can be uniquely reduced. As a result, the main component force Fy does not have to be specially improved. In contrast, it is easy to obtain a high tool post rigidity.
[0027]
To explain this, as is understood from the first equation, My1a is an amount that depends only on the distance A1. When the guide bush 23 is provided on the gantry 21, if an arrangement space for the second base member 30, the tool holder 33, and the like is secured, an area where the inclined surface itself can be arranged is limited. On the other hand, with respect to the dovetail groove 22, the feed screw 46 is supported at the position close to the slope in consideration of the balance between securing the rigidity and the sliding resistance of the first dovetail groove 22 from the form in which it is supported with respect to the mount 21. In addition, there is a demand for supporting the first dovetail groove 22 at approximately the center of the guide surface interval. The feed screw 46 is preferably arranged so that the offset distances A1 and A1 'are close to zero while satisfying each requirement.
[0028]
Furthermore, FIG. 8 is used to explain the balance relationship between the cutting point P1 and the load application point P3 that is virtually determined at the reference position located in the center in the height direction of the first dovetail groove 22 provided on the slope. To do. The offset distance between the load application point P3 and the cutting point P1 is A1 '. A reaction force of the feed component force Fz of the cutting tool is generated from the first dovetail groove 22 at the load application point P3. In this case, the balance formula of the moment by the feed component force Fz is as follows.
[0029]
Mz1 = Fzsinθ * B1-Fzcosθ * A1 ′
For comparison, a similar balance equation is also examined in the automatic lathe of the form shown in FIGS.
Mz2 = Fz * B2
Mz3 = Fz * A3 '
In the illustrated structure drawn on the premise that the normal design requirements are satisfied,
θ ≒ 60 °
B1 ≒ B2 ≒ A3
∴Mz1 <Mz2 ≒ Mz3
That is, as compared to the comparative example, in the embodiment of the present invention, the moment generated by the feed component force Fz can be uniquely reduced. As a result, the feed force force Fz does not have to be specially improved. In contrast, it is easy to obtain a high tool post rigidity.
[0030]
  To explain this, as is understood from the first equation, Mz1 is an amount depending on the distances A1 ', B1, and θ. In terms of design, the distance B1 depends on the size of the dovetail groove 22; that is, it is determined by the size of the machining load applied to the dovetail groove 22 and both requirements for making the size of the machine itself as compact as possible. As a constant selected based on In other words, B1Mz1It cannot be used to optimize the value of. on the other hand,A1 'Is a quantity that depends on θ, that is, by optimizing θMz1The value of can be reduced.
  When optimizing θ, the load application point P3, the load application point P2, and the cutting point P1 are arranged in this order as seen in the height direction of the dovetail groove 22 as shown in FIGS. More preferably. This is because Fzcosθ becomes a component that increases Mz1 when arranged in the order of P3, P1, and P2. In addition, this is not preferable because it leads to an increase in the size of the machine.
[0031]
  The operation of the automatic lathe according to the present embodiment achieved by the above mechanism will be described.
  As described above, in the automatic lathe 1 according to this embodiment, the first base member 25 is inclined and attached to the gantry 21. For this reason, compared with the mode shown in FIGS. 6 and 7, the offset distance A1 between the load application point P3 and the cutting point P1 that are virtually determined at the reference position located in the center of the first dovetail groove 22 in the height direction. 'Can be shortened. Furthermore, the offset distance A1 between the load application point P2 which is the center of the feed screw 46 and the cutting point P1 can also be shortened. Therefore, the main component force Fy,Feed force FzThe moments My1a and Mz1 generated by the above are reduced, and the load on the first dovetail groove 22 can be reduced.
[0032]
In the automatic lathe 1 according to this embodiment, the first base member 25 in the tool post 4 is provided to be inclined with respect to the gantry 21. For this reason, the weights of the first base member 25, the second base member 30, and the like are received by a surface having a large area where the sliding surface 22b of the first base member 25 and the first dovetail groove 22 of the mount 21 are in contact. it can. Therefore, the weight of the first base member 25, the second base member 30, and the like can be prevented from being greatly applied only to the lower end portion of the first dovetail groove 22. Therefore, it is possible to prevent the first dovetail groove 22 from being worn due to the weight of the first base member 25 and the second base member 30 and adversely affecting the service life. In addition, since the first base member 25 is disposed in an inclined manner, the installation area of the entire apparatus can be reduced as compared with the aspect in which the first base member is placed on the gantry as shown in FIG. I can do it.
[0033]
As mentioned above, although the suitable Example of this invention was described, this invention is not limited to the said embodiment. For example, in the above-described embodiment, a sliding guide, specifically a guiding member having a dovetail groove 22 is used as the guiding member, but a sliding guide having a V-shaped cross section or a rectangular section is also used. You can also. Further, not only sliding guidance but also rolling guidance having a linear guide can be used.
[0034]
Further, in the above-described embodiment, the attachment angle of the first base member 25 with respect to the gantry 21 is set to approximately 60 degrees due to various factors, but may be appropriately set according to the shape of the tool rest and the like. I can do it. Preferably, the angle is 30 degrees below and 70 degrees above about 45 degrees. Here, when determining the mounting angle of the first base member 25 with respect to the gantry 21, the distance A between the reference position in the height direction of the first dovetail groove 22 and the cutting edge position of the cutting tool B <b> 1 is shortened or set to zero. The arrangement relationship between the bush and the first guide member is preferable.
[0035]
【The invention's effect】
As described above, according to the present invention, an automatic lathe capable of preventing an increase in size of the base member, reducing the overall size, and reducing the load and weight load applied to a guide structure such as a dovetail groove. Can be provided.
[Brief description of the drawings]
FIG. 1 is a side view of an automatic lathe according to an embodiment of the present invention.
FIG. 2 is a side view of a tool post in an automatic lathe.
FIG. 3 is a front view of a tool post in an automatic lathe.
FIG. 4 is a plan view of a tool post in an automatic lathe.
FIG. 5 is a side view of the tool rest for explaining a moment load applied to a first dovetail groove in the tool rest.
FIG. 6 is a side view of a first embodiment of a tool post in an automatic lathe that can be considered based on a conventional automatic lathe.
FIG. 7 is a side view of a second mode of a tool post in an automatic lathe that can be considered based on a conventional automatic lathe.
FIG. 8 is a side view of the tool rest for explaining a moment load applied to a first dovetail groove in the tool rest.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automatic lathe, 2 ... Bed, 3 ... Spindle head, 4 ... Tool post, 5 ... Back attachment, 6 ... Chute, 11 ... Spindle, 12 ... Chuck, 13 ... 1st guide rail, 14 ... 1st runner block, 21 ... Mount, 22 ... 1st dovetail groove, 23 ... Guide bush, 24 ... Tool holder, 25 ... 1st base member, 26 ... 1st protrusion, 27 ... 1st spacer, 28 ... 2nd dovetail groove, 29 ... Servo motor, 30 ... 2nd base member, 31 ... 2nd protrusion part, 32 ... 2nd spacer, 33 ... Bite holder, 34 ... Damage detection device, 34A ... Drive plate, 34B ... Detection rod, 41 ... Attachment body, 42 ... Work holding part, 43 ... Guide rail, 44 ... Runner bro 45 ... feed nut, 46 ... feed screw, B1 to B6 bite, D1 to 4 ... drilling tool, My1a, My1b, My2a, My2b, My3a, My3b ... moment load, P1 ..Cutting point, P2... Load application point, P3... Load application point, P4.

Claims (2)

A spindle that grips the workpiece and rotates the workpiece around a predetermined Z axis;
A bite holder for holding a tool for machining the workpiece;
A first guide member for moving and guiding the tool holder in the Y-axis direction orthogonal to the Z-axis direction;
A first base member provided on the gantry via the first guide member and movable relative to the gantry in the Y-axis direction;
A second guide member for moving and guiding the tool holder in the X-axis direction orthogonal to the Z-axis direction and the Y-axis direction;
A second base member provided on the first base member via the second guide member, movable in the X-axis direction, and attached with the bite holder;
An automatic lathe, wherein a guide surface of the first guide member is formed to be inclined with respect to an XY plane including the X axis and the Y axis. The first guide member is a dovetail groove formed on one of the first base member and the gantry ;
Protruding members provided on the other of the first base member and the pedestal , fitted into the dovetail groove, and movable along the dovetail groove;
An automatic lathe according to claim 1 .

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