JP2014037043A - Machine tool having cutter holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform workpiece processing having high degree-of-freedom, while suppressing thermal displacement of a cutter holder body at parts where rotary tools are attached.SOLUTION: A machine tool (1) includes: a cutter holder body 20 having a holder base part 30 of which a longitudinal direction (X direction) is in a direction different from an axial direction (Z direction) of a workpiece W1, and first and second holder leg parts 40, 50 which protrude in a direction different from the axial direction (Z direction) and the longitudinal direction (X direction) of the holder base part 30, from one end side (31) in the longitudinal direction and the other end side (32) in the longitudinal direction, of the holder base part 30, and to which rotary tools RT1, RT2 are attached; a motor 65 provided at the holder base part 30; a first force transmission mechanism 70 for transmitting rotational driving force of the motor 65 to the rotary tool RT1 attached to the first holder leg part 40; and a second force transmission mechanism 80 for transmitting the rotational driving force of the motor 65 to the rotary tool RT2 attached to the second holder leg part 50.

Description

  The present invention relates to a machine tool including a tool post to which a rotary tool is attached.

  As a machine tool, there is known a CNC (Computerized Numerical Control) lathe for machining a work gripped by a spindle with a tool of a tool post. A lathe in which a guide bush is arranged between the front spindle and the rear spindle (opposite spindle), for example, supports the workpiece gripped by the front spindle with the guide bush and processes it with the front machining tool. Gripping with the back spindle and machining with the back machining tool. In a tool post provided with a rotary tool as a processing tool, a servo motor for driving the rotary tool is attached to the back side of the tool post main body to which the rotary tool is attached. That is, the rotary tool and the servo motor are attached to positions opposite to each other with respect to the tool post body. A tool post equipped with a rotating tool can machine a hole having a center different from the axis of the workpiece, such as a cross hole orthogonal to the axis of the workpiece.

  When the first tool post and the second tool post opposite to each other are provided, the rotary tool and the servo motor are attached to the tool post body at positions opposite to each other on the first tool post. In the table, the rotary tool and the servo motor are attached to positions opposite to each other with respect to the tool body. That is, the servo motor for driving the rotary tool is provided separately for each tool post body.

JP 2007-196366 A

  A servo motor for driving a rotary tool generates heat when driven. This heat is transmitted to the tool post body to which the servo motor is attached, and the tool post body to which the rotary tool is attached may be displaced. The thermal displacement of the tool post body leads to a decrease in processing accuracy by the rotary tool. In particular, if the number of rotating tools and servo motors is increased in order to improve the degree of freedom of workpiece processing, the heat generated from the servo motors increases.

  In addition, in the tool post cutting device described in Patent Document 1 cited as a reference, a plurality of tool post units to which a tool that does not rotate is attached are arranged in the circumferential direction around the spindle center line. Therefore, the servo motor for driving the rotary tool is not provided in the tool post unit, and the technique described in Patent Document 1 does not solve the above-described problem.

  In view of the above, the present invention has an object of performing workpiece machining with a high degree of freedom while suppressing thermal displacement of the tool post body at the portion where the rotary tool is attached.

In order to achieve the above object, the machine tool of the present invention includes a holder base portion whose longitudinal direction is directed in a direction different from the axial direction of the workpiece, and the shaft from one end side in the longitudinal direction and the other end side in the longitudinal direction of the holder base portion. A tool post body having first and second holder legs that project in a direction different from the central direction and the longitudinal direction of the holder base and to which the rotary tool is attached;
A motor provided at the holder base;
A first power transmission mechanism for transmitting a rotational driving force of the motor to a rotary tool attached to the first holder leg;
And a second power transmission mechanism that transmits the rotational driving force of the motor to the rotary tool attached to the second holder leg.

That is, the rotational driving force of the motor is transmitted to the rotary tools attached to the first and second holder legs protruding from one longitudinal end and the other longitudinal end of the holder base by the power transmission mechanism. Since the rotary tool is attached to the first and second holder legs, workpiece processing with a high degree of freedom can be performed.
Further, since the motor that generates heat is provided not at the holder leg but at the holder base, the heat from the motor is not directly transmitted to the holder leg. Further, the first and second power transmission mechanisms can share a motor that rotationally drives the rotary tools attached to the first and second holder legs, thereby reducing the amount of heat generated from the motor. be able to. Therefore, the thermal displacement of the holder leg which is the tool post body of the part to which the rotary tool is attached can be suppressed.

Here, the longitudinal direction of the holder base may be in a direction different from the axial direction of the workpiece, and may be a direction shifted from the direction orthogonal to the axial direction in addition to the direction orthogonal to the axial direction. The protruding direction of the holder leg may be in the direction different from the axial direction of the workpiece and the longitudinal direction of the holder base, and in addition to the axial direction and the direction orthogonal to the longitudinal direction, the axial center The direction and the direction shifted from the direction orthogonal to the longitudinal direction may be used.
The longitudinal direction one end side and longitudinal direction other end side of a holder base should just be a position shifted in the longitudinal direction from the center of the holder base, and are not limited to the end of the holder base.
The holder leg to which the rotary tool is attached includes both the holder leg with the rotary tool attached and the holder leg before the rotary tool is attached. Attaching the rotary tool includes attaching a rotary tool unit having a rotary tool. The rotary tool may be detachably attached to the holder leg or may be detachably attached to the holder leg. Further, a tool other than the rotary tool may be attached to the holder leg.
The holder leg may be fixed with respect to the holder base, but may be provided so as to be rotatable with respect to the holder base.

  The holder base may be capable of attaching a rotary tool to the protruding side of the first and second holder legs. Of course, attaching the rotary tool unit is also included in attaching the rotary tool. Since the workpiece can be machined by not only the rotary tool attached to the holder leg but also the rotary tool attached to the holder base, this aspect can improve the degree of freedom of workpiece machining.

  At least one of the first and second holder leg portions may be rotatable with respect to the holder base portion with its own protruding direction as a central axis. Further, a turning drive means for turning the holder leg that can be turned may be provided. Since the direction of the rotary tool attached to the pivotable holder leg can be changed, this embodiment can also improve the degree of freedom of workpiece machining.

According to the invention which concerns on Claim 1, it becomes possible to process a workpiece | work with a high freedom degree, suppressing the thermal displacement of the tool post main body of the part to which the rotary tool was attached.
The inventions according to claims 2 and 3 can improve the degree of freedom of workpiece machining.

2 is a front view schematically illustrating an outline of a configuration of a lathe 1. FIG. It is a figure which illustrates the external appearance of the tool post 10 at the time of holder leg part non-turning. It is a figure which illustrates the principal part of the tool post 10 at the time of a holder leg part non-turning partially in cross-sectional view. 3A is a diagram illustrating an example of a power transmission mechanism provided on the holder base 30 from the direction A1 in FIG. 3, and FIG. 3B is an example of the power transmission mechanism provided on the first holder leg 40 in FIG. The figure shown from A2 direction, (c) is a figure which shows the example of the power transmission mechanism provided in the 2nd holder leg part 50 from A3 direction of FIG. It is a figure which illustrates the principal part of the tool post 10 in which the turning drive means 100 was provided in partial cross section view. It is a figure which illustrates the A4-A4 cross section of FIG. (A) is a figure which illustrates the mode of the tool post 10 at the time of front processing, (b) is a figure which illustrates the mode of the tool post 10 at the time of back processing. It is a figure which shows the external appearance of the tool post 910 which concerns on a comparative example.

  Embodiments of the present invention will be described below. Of course, the embodiments described below are merely illustrative of the present invention.

(1) Outline of a machine tool provided with a tool post to which a rotating tool is attached:
FIG. 1 schematically shows a schematic configuration of a CNC lathe 1 illustrating the machine tool. In the machining section 200 of the lathe 1, a front spindle table 211 is provided on the front spindle table 210, a rear spindle table 221 is provided on the rear spindle table 220, and a tool post 10 is provided on the tool table 9. . The back main shaft 222 is an opposite main shaft of the front main shaft 212. A guide bush 230 is disposed between the front main shaft 212 and the rear main shaft 222. An NC (Numerical Control) device 300 is a computer including an operation accepting unit and a display unit, and is a control subject when numerically controlling the operation of the processing unit 200.

A collet (gripping tool) 213 for releasably gripping a long columnar material (work W1) supplied from behind is attached to the front end portion (right end portion in FIG. 1) of the front main shaft 212. Front spindle 212 holding the workpiece W1 is rotatably driven by the front spindle rotation servo motor (not shown) to rotate the workpiece W1 around an axis AX1 along the Z ₁ direction (lateral direction in FIG. 1). Front spindle 212 is driven in the Z ₁ direction with respect to the front headstock table 210 in front spindle feed servo motor (not shown) with a front headstock 211.

Guide bush 230, the workpiece W1 projecting from the front spindle 212 in the forward direction is inserted into the central through-hole, to hold the workpiece W1 in slidable state to Z ₁ direction. The guide bush 230 holding the workpiece W1 rotates about the axis AX1 together with the front main shaft 212.

A collet (gripping tool) 223 for releasably gripping the workpiece W1 after front processing supplied from the front is attached to the front end portion (left end portion in FIG. 1) of the back main shaft 222. Sub spindle 222 holding the workpiece W1 is rotatably driven by a sub spindle rotation servomotor (not shown), to rotate the workpiece W1 about the axis along the Z ₂ direction (lateral direction in FIG. 1). Back spindle 222 is driven to Z ₂ direction with respect to back attachment table 220 in the sub spindle feed servo motor (not shown) together with the back head stock 221. When the Z ₂ direction, the X direction, and the Y direction are orthogonal (different) directions, the back main shaft 222 may be driven in at least one of the X direction and the Y direction.
The X direction is the same direction along the control axis called the X axis, the Y direction is the same direction along the control axis called the Y axis, and the Z direction is the same direction along the control axis called the Z axis. is there. The substantially parallel Z ₁ direction and Z ₂ direction are collectively referred to as the Z direction.

  The tool post 10 shown in FIG. 2 and the like has a tool group including rotating tools RT1 to RT3 and tools T1 and T2 that do not rotate around the tool axis. The tools T1 and T2 include, for example, each comb-shaped tool shown in FIG. 2, a thread warping tool for thread cutting, a slotting tool for forming a slot, a polygon processing tool for forming a polygonal column, and the like. It is. The tool post 10 uses these tools to process the front side of the workpiece W1 held by the guide bush 230 or to process the back side of the workpiece W1 held by the back spindle 222. The tool post 10 also includes a motor 65 that is a servo motor for rotationally driving the rotary tools RT1 to RT3, and a motor 101 that is a servo motor for rotationally driving the holder leg 50. The tool post 10 is driven in the X direction with respect to the tool rest table 9 by a tool post X-axis feed servo motor (not shown), and is driven in the Y direction with respect to the tool rest table 9 by a tool post Y-axis feed servo motor (not shown). The The X direction, the Y direction, and the Z direction need only be different from each other, and are preferably substantially orthogonal from the viewpoint of ease of movement control, but at an angle of, for example, 45 ° or less from the orthogonal direction. The direction may be shifted.

  The NC device 300 numerically controls the rotational drive and the like of various servo motors by issuing an instruction according to an application program or a machining program to a servo amplifier connected to the various servo motors provided in the machining unit 200.

The machine tool illustrated in FIGS. 1 to 4 and the like includes the tool post body 20 and the rotation driving means 60 as basic elements.
The tool post body 20 has a holder base 30 and holder legs 40 and 50. The holder base 30 is oriented in the longitudinal direction (X direction) in a direction different from the axial direction (Z direction) of the workpiece W1. The first holder leg 40 protrudes from a connecting portion 31 on one end side in the longitudinal direction of the holder base 30 in a direction (Y direction) different from the Z direction and the X direction, and a rotary tool RT1 is attached thereto. The second holder leg 50 protrudes from the connecting portion 32 on the other end side in the longitudinal direction of the holder base 30 in a direction (Y direction) different from the Z direction and the X direction, and the rotary tool RT2 is attached thereto. The projecting direction of the holder legs 40 and 50 is preferably substantially parallel from the viewpoint of ease of movement control, but may be a direction deviated from the parallel direction at an angle of 45 ° or less, for example.

  The rotation driving means 60 includes a motor 65 and power transmission mechanisms 70 and 80. The motor 65 is provided on the holder base 30. The first power transmission mechanism 70 transmits the rotational driving force of the motor 65 to the rotary tool RT1 attached to the first holder leg 40. The second power transmission mechanism 80 transmits the rotational driving force of the motor 65 to the rotary tool RT2 attached to the second holder leg 50. Therefore, workpiece processing with a high degree of freedom is performed by the rotary tools RT1 and RT2 attached to both the holder legs 40 and 50.

  In recent years, the number of rotating tools has increased with the complexity of workpiece shapes. Arranging rotating tools necessary for workpiece machining in a row leads to an increase in the size of the tool post. In the present technology, the rotation of the tool post is suppressed by arranging the rotary tools RT1 and RT2 on the holder legs 40 and 50, respectively.

  FIG. 8 shows the appearance of the tool post 910 according to the comparative example. The tool rest 910 includes holder portions 940 and 950 having tool groups facing each other. That is, the rotary tool RT1 and the other tool T1 are provided on the inner side surface 941 of the first holder portion 940. A rotary tool RT2 and other tools T2 are provided on the inner surface 951 of the second holder portion 950. A servo motor 965 that rotationally drives the rotary tool RT1 is attached to the outer surface 942 of the first holder portion 940. A servo motor 966 that rotationally drives the rotary tool RT2 is attached to the outer side surface 952 of the second holder portion 950.

The motors 965 and 966 generate heat when driven. This heat is transmitted to the holder portions 940 and 950 to which the motors 965 and 966 are attached, and the holder portions 940 and 950 may be displaced. The thermal displacement of the holder portions 940 and 950 leads to a decrease in processing accuracy by the rotary tool.
In addition, since the motors 965 and 966 are attached to the outside of the holder portions 940 and 950 in the X direction, the tool post becomes large in the X direction.

On the other hand, in the machine tool illustrated in FIGS. 1 to 4, since the motor 65 is provided not on the holder legs 40 and 50 but on the holder base 30, the heat from the motor 65 is directly applied to the holder legs 40 and 50. I ca n’t tell you. Further, the power transmission mechanisms 70 and 80 can share the motor 65 that rotationally drives the rotary tools RT1 and RT2 attached to the holder leg portions 40 and 50, thereby reducing the amount of heat generated from the motor 65. be able to. Therefore, the present technology can suppress the thermal displacement of the holder leg portions 40 and 50 that are the tool post body 20 of the portion to which the rotary tool is attached.
Further, since the motor is eliminated from the X direction outside of the holder legs 40 and 50, the tool post is reduced in the X direction.
Furthermore, since the rotary tools RT1 and RT2 are rotationally driven by the same motor 65, the number of servo motors, servo amplifiers and cables is reduced, and the cost of the machine tool is reduced.

  The holder base 30 illustrated in FIGS. 2 and 3 is configured such that the rotary tool RT3 can be attached to the protruding side (inner side surface 33) of the holder legs 40 and 50. The holder base 30 is provided with a third power transmission mechanism 90 that transmits the rotational driving force of the motor 65 to the rotary tool RT 3 attached to the holder base 30 as a part of the rotational driving means 60. Since the workpiece W1 can be machined not only by the rotary tools RT1 and RT2 attached to the holder legs 40 and 50 but also by the rotary tool RT3 attached to the holder base 30, workpiece machining with a higher degree of freedom is performed.

  Moreover, the holder leg part 50 illustrated by FIGS. 2-6 can be turned with respect to the holder base 30 by making own protrusion direction (Y direction) into a central axis (swivel axis AX2). The tool post 10 is provided with a turning drive means 100 for turning the holder leg 50. In the tool post 910 shown in FIG. 8, since the motor 966 is attached to the second holder portion 950, the second holder portion 950 cannot be turned. The turret 10 illustrated in FIGS. 2 to 6 can change the direction of the rotary tool RT <b> 2 attached to the holder leg 50. Therefore, workpiece processing with a higher degree of freedom is performed.

(2) Description of specific examples of tool post:
The tool post main body 20 shown in FIG. 2 is provided with rotating tool units UR1 to UR3 obtained by unitizing the rotating tools RT1 to RT3. A rotary tool means the blade part which rotates among rotary tool units. The holder base 30 is oriented in the longitudinal direction in the X direction orthogonal to the Z direction. The holder leg portions 40 and 50 are oriented in the longitudinal direction in the Y direction perpendicular to the Z direction and the X direction. As shown in FIGS. 2 and 3, the second holder leg portion 50 that is capable of turning is a non-turning state when the rotary tools RT <b> 1 and RT <b> 2 are opposed to each other in the X direction.

A plurality of tool unit mounting portions 35 for removably attaching a tool such as the rotary tool RT3 are provided on the inner side surface 33 of the holder base 30. As shown in FIGS. 2 and 3, the rotary tool unit UR <b> 3 is attached to these tool unit mounting portions 35 with the rotation axis AX <b> 13 directed in the Y direction. In addition to the rotating tool unit, a threading unit for thread cutting, a slotting unit for forming a slot, a polygon processing unit for forming a polygonal column, and the like can be attached to the tool unit mounting portion 35. One tool unit may be attached to the plurality of tool unit mounting portions 35.
In addition, on the inner side surface 33 of the holder base, connection portions 31 and 32 of holder leg portions 40 and 50 are provided at positions on the outer side in the X direction from the tool unit mounting portion 35. A holder leg 40 protruding in the Y direction is fixed to one connection part 31. A holder leg 50 protruding in the Y direction is connected to the other connection portion 32 so as to be able to turn about the turning axis AX2. The connection portions 31 and 32 shown in FIGS. 2 and 3 are provided not on the strict ends in the longitudinal direction of the holder base 30 but on the inner side in the longitudinal direction from the strict ends.

A motor 65 for driving the rotary tool and a motor 101 for turning the holder leg are attached to the outer surface 34 of the holder base 30.
The holder base 30 shown in FIGS. 3 and 4A is provided with a drive shaft 66, transmission shafts 71, 81, 82, 83, and a tool shaft 91 of the rotary tool unit UR3.

  A plurality of rotary tool units UR1 having a rotary tool RT1 are attached to the inner side surface 41 of the first holder leg 40 with the rotation axis AX11 in the X direction. A tool unit mounting portion for detachably attaching the rotary tool unit UR1 may be provided on the inner surface 41. Further, a plurality of tools T1 are fixed to the inner surface 41 in a comb-tooth shape at a position on the tip side (lower side) from the rotary tool unit UR1.

A motor for driving the rotary tool is not attached to the outer surface 42 of the first holder leg 40.
The holder leg 40 shown in FIGS. 3 and 4B is provided with a transmission shaft 72 and a tool shaft 73 of each tool unit UR1.

  A plurality of rotary tool units UR2 having rotary tools RT2 at both ends are attached to the second holder leg 50 with the rotary shaft AX12 directed in the X direction during non-turning. One rotating tool RT2a protrudes inward in the X direction when not turning from the inner side surface 51, and the other rotating tool RT2b protrudes outward in the X direction when not turning. A tool unit mounting part for detachably attaching the rotary tool unit UR2 may be provided in the holder leg 50. In addition, a plurality of tools T2 are fixed to the inner surface 51 at positions on the front end side (lower side) from the rotary tool unit UR2.

A motor for driving the rotary tool is not attached to the outer surface 52 of the second holder leg 50.
The holder leg 50 shown in FIGS. 3 and 4C is provided with a transmission shaft 84 and a tool shaft 85 of each tool unit UR2.

  The holder base 30 is provided with a drive shaft 66 connected to the motor 65. A spur gear 66a is provided on the drive shaft 66 whose longitudinal direction is in the Y direction.

  The first power transmission mechanism 70 that transmits the rotational driving force of the motor 65 to the rotary tool RT1 of the first holder leg 40 includes a transmission shaft 71 provided on the holder base 30 and a transmission shaft provided on the holder leg 40. 72. The transmission shaft 71 having the longitudinal direction in the Y direction has a spur gear 71a on the outer surface 34 side and a bevel gear 71b on the inner surface 33 side. The spur gear 71a meshes with the spur gear 66a of the drive shaft. The transmission shaft 72 with the longitudinal direction oriented in the X direction has a spur gear 72a on the outer surface 42 side and a bevel gear 72b on the inner surface 41 side. The bevel gears 71b and 72b mesh with each other. The tool shaft 73 of each rotary tool unit UR1 is provided on the holder leg 40 with the longitudinal direction facing the X direction, has a spur gear 73a on the outer surface 42 side, and the rotary tool RT1 protrudes from the inner surface 41. . The spur gear 73a of the tool shaft 73 closest to the transmission shaft 72 and the spur gear 72a of the transmission shaft 72 are engaged with each other. Adjacent spur gears 73a and 73a mesh with each other.

  The second power transmission mechanism 80 for transmitting the rotational driving force of the motor 65 to the rotary tool RT2 of the second holder leg 50 is provided on the transmission shafts 81, 82, 83 provided on the holder base 30 and the holder leg 50. Transmission shaft 84. The transmission shaft 81 whose axis is directed in the Y direction has a spur gear 81a meshed with a spur gear 66a of the drive shaft. The transmission shaft 82 whose axis is directed in the Y direction has a spur gear 82 a that meshes with a spur gear 81 a of the transmission shaft 81. As shown in FIG. 4A, the transmission shafts 81 and 82 are shifted in the X direction so as to avoid the tool shaft 91 of each rotary tool unit UR3. The transmission shaft 83 whose longitudinal direction is in the Y direction has a spur gear 83a on the outer surface 34 side and a bevel gear 83b on the inner surface 33 side. The spur gear 83 a meshes with the spur gear 82 a of the transmission shaft 82. The transmission shaft 84 whose longitudinal direction is in the X direction has a spur gear 84a on the outer surface 52 side and a bevel gear 84b on the inner surface 51 side. The bevel gears 83b and 84b mesh with each other. The tool shaft 85 of each rotary tool unit UR2 is provided on the holder leg 50 with its longitudinal direction facing the X direction during non-turning, has a spur gear 85a in the middle position, and the rotary tool RT2a protrudes from the inner side surface 51. The rotary tool RT2b protrudes from the outer surface 52. The spur gear 85a of the tool shaft 85 closest to the transmission shaft 84 and the spur gear 84a of the transmission shaft 84 are meshed with each other. Adjacent spur gears 85a and 85a mesh with each other.

  The third power transmission mechanism 90 that transmits the rotational driving force of the motor 65 to the rotary tool RT3 of the holder base 30 is provided with spur gears 66a and 91a shown in FIG. The spur gear 66a, 81a, 82a, 91a shown in FIG. 4A is engaged with the rotating tool RT3 on the right side of FIG. The tool shaft 91 of each rotary tool unit UR3 is provided on the holder base 30 with the longitudinal direction in the Y direction, has a spur gear 91a on the outer side surface 34 side, and the rotary tool RT3 projects from the inner side surface 33. The left spur gear 91 a in FIG. 4A directly meshes with the spur gear 66 a of the drive shaft 66. The right spur gear 91 a in FIG. 4A meshes with the spur gear 82 a of the transmission shaft 82.

  FIG. 5 shows a partial cross-sectional view of the main part of the tool post 10 having the turning drive means 100 in a state where the second holder leg 50 is turned 90 °. FIG. 6 shows a cross section A4-A4 of FIG.

  The turning drive means 100 includes a holder leg turning drive motor 101, a speed reducer 102, and transmission shafts 103 to 105. The drive shaft of the motor 101 and the transmission shafts 103 to 105 are rotatable around a turning axis AX2 that is also the axis of the transmission shaft 83. The input end of the speed reducer 102 is fixed to the drive shaft of the motor 101. The reducer 102 reduces the rotational speed of the drive shaft of the motor 101 to a predetermined ratio and transmits it to the transmission shaft 103. The input end (upper end portion) of the transmission shaft 103 is fixed to the output end of the speed reducer 102. The transmission shaft 104 is disposed outside the spur gear 83a of the transmission shaft 83 having the same axis. An input end (upper end portion) of the transmission shaft 104 is fixed to an output end (lower end portion) of the transmission shaft 103. As shown in FIG. 6, the connecting portion 104a of the transmission shaft 104 to the transmission shaft 103 is only part of the periphery of the spur gear 83a. That is, the transmission shaft 104 is formed with an opening 104 b for meshing the spur gear 83 a with the spur gear 82 a of the transmission shaft 82. The transmission shaft 105 is disposed concentrically with the transmission shaft 83 outside the transmission shaft 83 having the same axis. The input portion of the transmission shaft 105 is fixed to the output portion of the transmission shaft 104. An output end (lower end portion) of the transmission shaft 105 is fixed to an upper portion of the second holder leg portion 50.

As shown in FIG. 7A, the turning drive means 100 described above turns the second holder leg 50 within a predetermined angular range around the tip of the rotary tool RT2a on the inner surface 51 side. In FIG. 7A, the holder leg 50 is set to 135 ° in one direction (on the back main shaft 222 side), with the angle 0 ° for making the rotary tool RT2a opposed to the rotary tool RT1 of the first holder leg 40 as a non-turning angle. Is shown to be pivotable. For example, if the rotation angle is 0 °, the movement of the Z ₁ direction front spindle 212, and, X of the tool rest 10, together with the movement in the Y direction, the workpiece W1 held by the guide bush 230 On the other hand, the cross hole can be machined by the rotary tool RT2a. Of course, the cross hole on the opposite side to the cross hole by the rotary tool RT2a can be processed by the rotary tool RT1 of the first holder leg 40. When the turning angle is 45 ° or 135 °, it is possible to carry out front oblique hole machining with the rotary tool RT2a on the workpiece W1 held by the guide bush 230. When the turning angle is 90 °, front hole machining can be performed with the rotary tool RT2a.

The rotating tool of the pivotable holder leg 50 can be used for back machining as shown in FIG. For example, if the turning angle is 90 °, the movement of the Z ₂ direction back spindle 222, and, X of the tool rest 10, together with the movement in the Y direction, the workpiece W1 held by the back spindle 222 On the other hand, back hole machining can be performed with the rotary tool RT2b. When the turning angle is 45 ° or 135 °, the back diagonal hole machining can be performed on the workpiece W1 held on the back main shaft 222 by the rotary tool RT2b.

  In addition, the principal part and tool (RT1-RT3, T1, T2) of the tool rest main body 20 can be formed, for example with a metal.

(3) Operation, action and effect of machine tool with tool post:
Next, the operation, action, and effect of the lathe 1 will be described with reference to FIGS.
The rotational driving force from the servo motor 65 for driving the rotary tool is transmitted to the rotary tools RT1 to RT3 via the power transmission mechanisms 70, 80, 90.

The first power transmission mechanism 70 applies rotational driving force from the drive shaft 66 in the order of the transmission shaft 71 of the holder base 30, the transmission shaft 72 of the first holder leg 40, and the tool shaft 73 of the rotary tool unit UR1. Tell. Thereby, each rotary tool RT1 rotates synchronously about the rotation axis AX11.
The second power transmission mechanism 80 uses the rotational driving force from the drive shaft 66 to transmit the transmission shafts 81, 82, 83 of the holder base 30, the transmission shaft 84 of the second holder leg 50, and the tool axis of the rotary tool unit UR2. We tell in order of 85. Thereby, each rotary tool RT2 rotates around the rotation axis AX12 in synchronization. Even when the rotary tool RT3 is not attached to the tool unit mounting portion 35, the rotational driving force is transmitted to the tool shaft 85 by the transmission shafts 81, 82, 83.

  The third power transmission mechanism 90 transmits the rotational driving force from the drive shaft 66 directly to the tool shaft 91 of the left rotary tool unit UR3. The third power transmission mechanism 90 transmits the rotational driving force from the drive shaft 66 in the order of the transmission shafts 81 and 82 and the tool shaft 91 of the right rotating tool unit UR3. Therefore, each rotary tool RT3 rotates around the rotation axis AX13 in synchronization.

  The turning driving force from the servo motor 101 for turning the holder leg is transmitted to the second holder leg 50 through the turning force transmission mechanism (the speed reducer 102 and the transmission shafts 103 to 105). That is, the rotation of the drive shaft of the motor 101 is decelerated to a predetermined ratio by the speed reducer 102, the transmission shafts 103, 104, and 105 are rotated at a low speed, and the holder leg 50 is turned around the turning axis AX2. As a result, the rotary tool RT2a can be used at various turning angles for front machining of the workpiece W1 as shown in FIG. 7 (a), and various back machining of the workpiece W1 can be performed as shown in FIG. 7 (b). The rotary tool RT2b can be used at the turning angle.

As described above, the lathe 1 can perform workpiece machining with a high degree of freedom because the rotary tools RT1 to RT3 are attached to the holder base 30 and the holder legs 40 and 50, respectively. Since the motor 65 for rotationally driving these rotary tools RT1 and RT2 is attached to the holder base 30 instead of the holder legs 40 and 50, the heat from the motor 65 directly goes to the holder legs 40 and 50. I don't get it. Furthermore, since the rotary tools RT1 to RT3 can be rotationally driven by the same motor 65, the amount of heat generated from the motor 65 can be reduced.
Therefore, the lathe 1 can suppress the thermal displacement of the holder legs 40 and 50, can reduce the tool post in the X direction, and reduce the cost by reducing the number of servo motors, servo amplifiers, and cables. Can do.

  Further, since the lathe 1 does not have a motor for driving the rotary tool on the holder leg, the holder leg attached with the rotary tool can be turned. Therefore, the lathe 1 can improve the degree of freedom of workpiece processing.

(4) Modification:
Various modifications can be considered for the present technology.
For example, the present technology can be applied to machine tools other than a lathe.
The connecting portions 31 and 32 of the holder legs 40 and 50 may be strict ends in the longitudinal direction of the holder base 30.
The number of rotary tools provided in the holder base 30 and the holder legs 40 and 50 is not particularly limited and may be one. When the first holder leg 40 is turnable, a rotary tool may be provided on the outer surface 42 of the holder leg 40, or a rotary tool protruding in the X direction or the like may be provided. The second holder leg 50 may be provided with a rotary tool only on one of the inner side surface 51 and the outer side surface 52, or may be provided with a rotary tool protruding in the X direction or the like. Even if the rotary tool is not attached to the holder base 30, the effect of suppressing the thermal displacement of the holder leg can be obtained. A tool that does not rotate with the rotating tool may be attached to the holder base 30. The holder legs 40 and 50 may not have the tools T1 and T2.
The rotational driving force may be transmitted from the motor to the rotary tool by a belt or the like in addition to the gear.

  The rotary tool attached to the tool post body 20 may be selectively rotated. For example, if the holder base 30 is provided with a mesh release mechanism for releasing the meshing between the spur gear 66a of the drive shaft 66 and the spur gear 71a of the transmission shaft 71, the rotational driving force when the meshing of the spur gears 66a, 71a is released. Is not transmitted to the rotary tool RT1 group of the holder leg 40. If the holder base 30 is provided with a meshing release mechanism for releasing the meshing between the spur gear 82a of the transmission shaft 82 and the spur gear 83a of the transmission shaft 83, the rotational driving force is applied to the holder when the meshing of the spur gears 82a, 83a is released. It cannot be transmitted to the rotary tool RT2 group of the leg 50. The holder base 30 may be provided with a mesh release mechanism that releases the mesh with the spur gears 66a and 91a and a mesh release mechanism that releases the mesh with the spur gears 82a and 91a.

  The mesh release mechanism can be constituted by a reciprocating mechanism that moves one spur gear away from the meshing spur gear or contacts the meshing spur gear, for example. When the spur gear 71a is reciprocated to come into contact with the spur gear 66a or separated from the spur gear 66a, the rotational driving force can be transmitted to the rotary tool RT1 group or the transmission can be stopped. The same applies to the rotary tool RT2 group and the rotary tool RT3 group. Of course, the rotational drive of the rotary tool may be individually controlled.

In addition, even if the holder leg parts 40 and 50 do not turn, the basic effect that the thermal displacement of a holder leg part is suppressed is acquired. Even if a rotary tool is not attached to the holder base 30, the above basic effect can be obtained.
As illustrated above, the above-described basic actions and effects can be obtained even with a technique or the like that does not have the constituent requirements according to the dependent claims but includes only the constituent requirements according to the independent claims.

By the way, according to the above-described embodiment, the machine tool (1) of the present invention includes a holder base 30 having a longitudinal direction (X direction) directed in a direction different from the axial direction (Z direction) of the workpiece W1, and the holder base. 30 protrudes in a direction different from the axial direction (Z direction) and the longitudinal direction (X direction) of the holder base 30 from one longitudinal side (31) and the other longitudinal end side (32) of the rotary tool RT1, RT2. Are attached to the first and second holder legs 40, 50, and the holder base 30 is provided with a rotary tool RT3 on the protruding side (33) of the first and second holder legs 40, 50. A tool post body 20 that can be attached;
The first and second holder leg portions 40 and 50 and the rotation driving means 60 that rotationally drives the rotary tools RT1 to R3 attached to the holder base 30 are provided.

That is, the rotary tools RT1 and RT2 are attached to the first and second holder leg portions 40 and 50, and the rotary tool RT3 is attached to the protruding side (33) of the holder leg portions 40 and 50 in the holder base 30. . Therefore, this aspect can improve the degree of freedom of workpiece machining.
In this aspect, even if the holder leg portions 40 and 50 do not turn, the basic effect of improving the degree of freedom of workpiece processing can be obtained. In this aspect, the basic effect can be obtained even if a motor for driving the rotary tool is provided on the holder legs 40 and 50.

  As illustrated above, the above-described basic functions and effects can be obtained even with a technique that includes only the constituent elements according to the aspect of the independent claim.

As described above, according to the present invention, according to various aspects, a technique for machining a workpiece with a high degree of freedom while suppressing thermal displacement of the tool post body at the portion where the rotary tool is attached, and the degree of freedom of workpiece machining are improved. Can be provided.
In addition, the configurations disclosed in the embodiments and modifications described above are mutually replaced, the combinations are changed, the known technology, and the configurations disclosed in the embodiments and modifications described above are mutually connected. It is possible to implement a configuration in which replacement or combination is changed. The present invention includes these configurations and the like.

DESCRIPTION OF SYMBOLS 1 ... Lathe (machine tool), 10 ... Turret, 20 ... Turret body,
30 ... Holder base, 31, 32 ... Connection part,
33 ... inner side surface (side from which holder leg protrudes) 34 ... outer side surface,
35 ... Tool unit mounting part,
40 ... first holder leg, 41 ... inner side, 42 ... outer side,
50 ... Second holder leg, 51 ... Inner surface, 52 ... Outer surface,
60 ... Rotation drive means, 65 ... Motor, 66 ... Drive shaft, 66a ... Spur gear,
70: first power transmission mechanism, 71, 72: transmission shaft,
71a, 72a ... spur gear, 71b, 72b ... bevel gear,
73 ... Tool shaft, 73a ... Spur gear,
80 ... second power transmission mechanism, 81, 82, 83, 84 ... transmission shaft,
81a, 82a, 83a, 84a ... spur gear, 83b, 84b ... bevel gear,
85 ... Tool shaft, 85a ... Spur gear,
90 ... Third power transmission mechanism, 91 ... Tool shaft, 91a ... Spur gear,
DESCRIPTION OF SYMBOLS 100 ... Turning drive means, 101 ... Motor, 102 ... Reduction gear,
103, 104, 105 ... transmission shaft, 104a ... connection, 104b ... opening,
212 ... Front spindle, 222 ... Back spindle, 230 ... Guide bush,
AX1 ... axis, AX2 ... swivel axis, AX11-AX13 ... rotation axis,
RT1 to RT3, RT2a, RT2b ... rotary tools, T1, T2 ... tools,
UR1 to UR3 ... Rotary tool unit,
W1 ... Work.

Claims (3)

A holder base whose longitudinal direction is directed in a direction different from the axial direction of the workpiece, and a direction different from the axial direction and the longitudinal direction of the holder base from one longitudinal end and the other longitudinal end of the holder base. A tool post body having first and second holder legs to which the protruding rotating tool is attached;
A motor provided at the holder base;
A first power transmission mechanism for transmitting a rotational driving force of the motor to a rotary tool attached to the first holder leg;
A machine tool comprising: a second power transmission mechanism that transmits a rotational driving force of the motor to a rotary tool attached to the second holder leg.   The machine tool according to claim 1, wherein the holder base is capable of attaching a rotary tool to the protruding side of the first and second holder legs. At least one of the first and second holder leg portions is rotatable with respect to the holder base portion with its own protruding direction as a central axis,
The machine tool according to claim 1, further comprising a turning drive unit that drives the turnable holder leg to turn.

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