JP5243124B2 - Machine Tools - Google Patents

Description

  The present invention relates to a machine tool having a main shaft that is configured to be rotatable by attaching a tool for machining to a workpiece, and a turning main shaft that can turn and index the main shaft about a turning axis.

  For example, in Patent Document 1, a tool support is provided so as to be rotatable about a predetermined rotation axis, and in a machine tool in which a turning tool or a rotating tool is mounted and used on the tool support, A technique is disclosed in which the rigidity of the tool is improved, the positioning accuracy is improved, and the tool spindle is quickly rotated and positioned at a fine index angle during rotary machining.

In the machine tool of Patent Document 1, when turning using the above-described turning tool, the first coupling member of the tool post main body is engaged with the second coupling of the tool support so that the tool base main body is engaged. To clamp the tool support.
Further, in the machine tool of Patent Document 1, the tool post is brought into contact with the second friction clamp surface of the tool support by bringing the first friction clamp surface of the tool base body into contact with the second friction clamp surface of the tool support during the rotary processing using the rotary tool. The tool support is clamped against the body.

In the above machine tool, at the time of turning, the rigidity at the time of supporting the tool support with respect to the tool post body can be improved by the engagement between the first coupling member and the second coupling member. This improves the positioning accuracy of the tool spindle.
In addition, in the above machine tool, the first friction clamp surface and the second friction clamp are used by utilizing the surface friction between the first friction clamp surface and the second friction clamp surface at the time of rotational processing. Clamping and unclamping between the surfaces is simple and quick, and the tool spindle is positioned at an arbitrary angle.
Therefore, in the above machine tool, a method of clamping the tool support relative to the blade support can be selected in accordance with the form of each processing (turning, rotational processing).
JP-A-10-328907

  By the way, in general, chatter vibration may occur in a tool due to instability of a machining state when machining a workpiece. When chatter vibration is generated in the tool, it is considered that due to the chatter vibration, the machining accuracy of the workpiece is lowered and the finished surface of the workpiece is adversely affected. For this reason, in order to perform various machining operations on the workpiece, it is necessary to increase the rigidity of the spindle in order to make the spindle to which the tool can be attached difficult to be affected by chatter vibration in a state where the spindle is positioned at an arbitrary angle. is there.

  However, in the machine tool of Patent Document 1, when the number of engagement points between the first coupling member and the second coupling member is increased in order to increase the rigidity of the tool support that supports the spindle to which the tool can be attached. The total length of the first coupling member and the total length of the second coupling member are each increased. Thereby, the dimension of a tool post main body provided with the 1st coupling member and the dimension of a tool support provided with the 2nd coupling member increase, respectively. For this reason, there is a concern that the size of the machine tool increases as the size of the tool post body and the size of the tool support increase.

  The present invention has been proposed in view of such a situation, and can prevent an increase in the size of the apparatus, and the rigidity of the main shaft can be determined with a main shaft to which a tool can be attached positioned at an arbitrary angle. An object of the present invention is to provide a machine tool that can improve the process.

A machine tool according to a first aspect of the present invention is a spindle head having a spindle capable of rotating with a tool for machining a workpiece, fixed to the spindle head, and pivoting the spindle about a pivot axis. In a machine tool having a pivotable spindle, the upper side in the vertical direction corresponding to the axial direction of the pivotal spindle is fixed to the spindle head, and the housing in the headstock that supports the pivotable spindle is fixed in the vertical direction. and retractable sleeve member, said formed to swivel the spindle, a first tapered portion inclined by a prescribed angle with respect to the vertical direction toward the end portion in the vertical direction of the revolving spindle, being formed in the sleeve member the a first tapered portion and a parallel second tapered portion, provided with a, the adjacent sleeve member, said the upper surface of the sleeve member in the axial direction of the sleeve member which coincides with the vertical direction housings Is formed between the grayed, the second tapered portion is moved toward the first tapered portion to the lower side of the front Symbol vertically, the second tapered portion wherein the first tapered portion to the lower And a first pressurized fluid working chamber into which a pressurized fluid that generates a pressing force to be pressed flows.

According to the machine tool of the first aspect of the present invention, the second taper formed on the sleeve member in parallel with the first taper is formed in surface contact with the first taper formed on the turning main shaft. In addition, the first taper portion and the second taper portion can be brought into pressure contact by the pressing force generated by the pressurized fluid. Thereby, a braking force can be applied to the turning main shaft fixed to the main shaft head having the main shaft.
The rotation of the turning main shaft is braked by pressing (contacting) the first taper portion formed on the turning main shaft and the second taper portion formed on the sleeve with a relatively small hydraulic pressure. Therefore, the structure of the hydraulic pump, the hydraulic cylinder, etc. can be reduced in size, which contributes to the downsizing of the mechanism for restricting the rotation of the swiveling main shaft and the downsizing of the machine tool.

According to a second aspect of the present invention, in the first aspect of the present invention, the rotation that presses the turning main shaft in the radial direction of the turning main shaft in contact with the housing between the housing and the sleeve member and restricts the rotation of the turning main shaft. A rotation control mechanism that is formed between the housing and the sleeve member and that is expanded by the pressure of the pressurized fluid; a second pressurized fluid working chamber into which the pressurized fluid flows; And an elastic member that presses the turning main shaft from the housing toward the radial direction of the turning main shaft.
According to the invention of claim 2, the elastic member is expanded by the pressure of the pressurized fluid flowing into the second pressurized fluid working chamber formed between the housing of the headstock and the sleeve member, and the swiveling spindle Is pressed from the housing toward the radial direction of the turning main shaft. In addition, a pressing force can be applied to the turning main shaft by pressing the turning main shaft from the housing toward the radial direction of the turning main shaft by the elastic member. For this reason, the pressing force can increase the frictional force that restricts the rotation of the turning main shaft. Thereby, it can prevent that the main axis | shaft fixed to the turning main axis | shaft rotates.
Furthermore, since it has both the mechanism for restricting the rotation of the turning main shaft composed of the first taper portion and the second taper portion and the rotation restricting mechanism having the elastic member, there are two mechanisms for restricting the rotation of the turning main shaft. By dividing the structure into two parts, each structure can be further reduced, and the degree of freedom of arrangement of each structure is increased. Therefore, the mechanism for restricting the rotation of the pivoting spindle can be downsized, and further downsizing the machine tool. Contribute. A structure that regulates the rotation of the swivel spindle when the same pressurized fluid is used for pressure contact (adhesion) / separation between the first taper part and the second taper part, or when the elastic member is expanded. Control can be simplified.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a pressing force adjusting unit that increases the pressing force by increasing the pressure of the pressurized fluid is provided.
According to the invention of claim 3, the pressing force adjusting portion increases the pressing force for moving the second taper portion to the first taper portion, and with respect to the first taper portion according to the magnitude of the increased pressing force. The restraining force of the second taper portion can be increased.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a diamond plating layer is formed on one or both of the surface of the first taper portion and the surface of the second taper portion. It is characterized by.
According to the invention of claim 4, surface treatment with high frictional resistance can be applied to either one or both of the surface of the first taper portion and the surface of the second taper portion with diamond having high hardness. Thereby, the frictional force between the 1st taper part and the 2nd taper part can be increased.

  According to the machine tool of the present invention, the swiveling main shaft is moved by press-contacting (contacting) the first taper portion formed on the swiveling main shaft and the second taper portion formed on the sleeve with a relatively small hydraulic pressure. Since it is possible to effectively brake the rotation, the configuration of the hydraulic pump, the hydraulic cylinder, etc. can be reduced in size, and the size of the mechanism that restricts the rotation of the swivel spindle can be reduced. Contributes to downsizing. Moreover, since it has both the mechanism which controls rotation of the turning main shaft which consists of said 1st taper part and said 2nd taper part, and said rotation restriction mechanism provided with the elastic member, the mechanism which controls rotation of a turning main shaft is 2 By dividing the structure into two parts, each structure can be further reduced, and the degree of freedom of arrangement of each structure is increased. Therefore, the mechanism for restricting the rotation of the pivoting spindle can be downsized, and further downsizing the machine tool. Contribute. A structure that regulates the rotation of the swivel spindle when the same pressurized fluid is used for pressure contact (adhesion) / separation between the first taper part and the second taper part, or when the elastic member is expanded. Control can be simplified.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall perspective view of the combined machining lathe 1. The combined machining lathe 1 is an example of a machine tool according to the present invention. The combined machining lathe 1 includes a bed 10, a first spindle stock 20, a second spindle stock 30, a first tool post 40, and a second tool post 50.

  The bed 10 includes a guide rail 11. The two guide rails 11 are laid in parallel on the inclined surface of the bed 10.

  The first spindle stock 20 includes a first base portion 21 and a first spindle portion 22. The first base portion 21 is fixed to the bed 10. A chuck (not shown) can be attached to the first main spindle portion 22. A workpiece is gripped by the chuck.

  The second head stock 30 includes a second base portion 31 and a second main shaft portion 32. The second base 31 is engaged with the guide rail 11. Similar to the first main spindle 22 described above, the work is gripped by the second main spindle 32 via a chuck (not shown).

  The first tool post 40 includes a support base 41 and a spindle head 60. The support base 41 is supported by the column 5 so as to be movable in the X direction. Further, the column 5 can be moved in the Z direction on two guide rails 12 provided in parallel to each other on the upper surface of the bed 10.

  The second tool post 50 includes a tool post body 51 and a turret head 52. The tool post main body 51 is engaged with the guide rail 11 together with the second base portion 31 described above. Various tools 53 can be attached to the turret head 52. By rotating and indexing the turret head 52, the tool 53 is indexed to the workpiece machining position.

  As shown in FIG. 2, the support base 41 includes a turning main shaft 61, a sleeve 62, a piston P, and a support base main body 66. The pivot main shaft 61 is supported by the support base body 66 by the bearing B. A turning spindle 61 is fixed to the spindle head 60 in a direction orthogonal to the spindle head 60. The turning main shaft 61 is rotationally driven by the rotational drive mechanism 70. The spindle head 60 is rotationally indexed at a predetermined angle about the turning axis B1 by the rotation drive mechanism 70. Here, the rotation drive mechanism 70 includes a gear that meshes with the turning main shaft 61. A tool spindle 42 is rotatably inserted into the spindle head 60. The tool spindle 42 is rotationally driven by a spindle drive mechanism (not shown). A tool 43 can be attached to the tool spindle 42 as shown in FIGS. The tool spindle 42 is an example of a spindle in the present invention, and the support base body 66 is an example of a spindle head. The turning axis B1 is an example of the turning axis of the present invention.

  The sleeve 62 is loosely fitted in the housing 66 </ b> A of the support base body 66. Even if the turning main shaft 61 rotates by fixing the leaf spring 80 to both the housing 66A and the sleeve 62 with the bolt 81, the sleeve 62 moves in the axial direction of the turning main shaft 61 within the housing 66A. It becomes possible and is restricted from rotating. The sleeve 62 has a second tapered surface T2. The second tapered surface T <b> 2 has a shape that expands at a predetermined angle toward the distal end side of the sleeve 62.

  A first taper surface T1 is formed on the turning main shaft 61. The first tapered surface T1 is formed at a position facing the second tapered surface T2. The second tapered surface T2 is formed in parallel with the first tapered surface T1.

  A second empty space 65 is formed between the upper surface of the sleeve 62 and the support base 66. The second vacant chamber 65 is formed in the axial direction of the sleeve 62. As will be described later, pressure oil is supplied to the second vacant chamber 65. Pressure is applied to the sleeve 62 by the pressure oil. As a result, the sleeve 62 moves downward in the axial direction of the sleeve 62. When pressure oil is not supplied to the second vacant chamber 65, the leaf spring 80 holds the sleeve 62 at a position where the first taper surface T1 of the turning main shaft 61 and the second taper surface T2 of the sleeve 62 do not contact each other. Is done.

  The second vacant chamber 65 is connected to the first vacant chamber 63 by the communication path 68. For this reason, the pressure oil supplied to the second empty chamber 65 is also supplied to the first empty chamber 63 through the communication path 68.

  A piston P is provided below the sleeve 62 so as to be movable up and down. A third cavity 67 is formed between the upper surface of the piston P and a surface of the support base body 66 that faces the upper surface of the piston P, and the downward surface of the piston P and the support base body A fourth empty space 75 is formed between one surface of 66 and a surface facing the downward surface of the piston P. A plurality of protrusions are provided on the lower surface of the piston P. The plurality of protrusions of the piston P can be engaged with the plurality of protrusions provided on the turning main shaft 61 and the support base body 66 facing the lower surface of the piston P, and a coupling is formed by both protrusions. ing. Thereby, rotation of the turning main shaft 61 is restricted. Here, the turning main shaft 61 is rotated in a state where the turning main shaft 61 is rotationally driven to a position where the protruding portion of the piston P described above meshes with the protrusion provided on the turning main shaft 61 and the support base body 66 described above. Can be regulated. The piston P moves to the lower side in the axial direction of the sleeve 62 by the pressure oil supplied to the third chamber 67, and the upper side in the axial direction of the sleeve 62 by the pressure oil supplied to the fourth chamber 75. It is possible to float to.

  An elastic member 64 is fixed to the outer periphery of the sleeve 62. The vicinity of the central portion of the elastic member 64 is cut out over the entire circumference to form a thin wall, and the upper and lower portions of the cut out portion are formed thick. Thereby, a first empty chamber 63 is formed between the thin portion of the elastic member 64 and the sleeve 62. Here, the elastic member 64 is formed of a metal such as a steel material. In this embodiment, the upper thick portion and the lower thick portion of the elastic member 64 are connected and fixed to the sleeve 62 by the electron beam welding method. As a result, the elastic member 64 and the sleeve 62 are welded and firmly connected without being distorted, and a gap is prevented from being generated between the elastic member 64 and the sleeve 62. Even if supplied, the pressure oil is prevented from leaking from between the elastic member 64 and the sleeve 62.

  As shown in FIG. 2, a hydraulic circuit is connected to the support base body 66. The hydraulic circuit includes a direction switching valve 71, a pilot check valve 72, an electromagnetic valve 73, and a pressure increasing valve 74.

  The first port of the direction switching valve 71 is connected to the hydraulic pump P1 via the first pump connection pipe 71A. The second port of the direction switching valve 71 is connected to the tank T via the first tank connection pipe 71B.

  The third port of the direction switching valve 71 is connected to the third empty chamber 67 via the first oil feed pipe 72A. A pilot check valve 72 is provided in the first oil feed line 72A. The fourth port of the direction switching valve 71 is connected to the fourth empty chamber 75 via the second oil feed line 72B. A pilot port of a pilot check valve 72 is connected to the second oil feed line 72B. Note that the oil discharged from the fourth empty chamber 75 is returned to the tank T. Pressure oil is sent from the tank T toward the third empty chamber 67 by the hydraulic pump P1.

  One of the solenoid valves 73 is connected to the hydraulic pump P1 via the second pump connection pipe 73A. The other side of the electromagnetic valve 73 is connected to the tank T through the second tank connection pipe 73B.

  One of the electromagnetic valves 73 is connected to the second empty chamber 65 via a third oil feed conduit 74A. A pressure increasing valve 74 is connected to the third oil feed line 74A. A bypass pipe 74B is connected to the other side of the electromagnetic valve 73 described above. The bypass conduit 74B is a conduit that bypasses the hydraulic pump P2 provided in the third oil feed conduit 74A.

  Next, the operation of the combined machining lathe 1 will be described as an embodiment of the machine tool of the present invention. Hereinafter, as an example of machining that requires a large load, operations during turning will be described. At the time of turning, with the pivot main shaft 61 indexed at a predetermined angle, the piston P is lowered, and the projections (couplings) of the piston P, the pivot main shaft 61 and the support base body 66 are engaged with each other. The first taper surface T1 and the second taper surface T2 and the elastic member 64 and the turning main shaft 61 are separated from each other. That is, first, the hydraulic oil is supplied to the fourth empty chamber 75 through the direction switching valve 71 and the second oil feed pipe 72B by the hydraulic pump P1. As a result, the piston P moves upward in the axial direction of the sleeve 62. For this reason, the meshing state of the protrusions of the piston P, the turning main shaft 61 and the support base body 66 described above is released.

  Thereafter, the rotation driving mechanism 70 indexes the rotation main shaft 61 to a predetermined rotation angle around the rotation axis B1. As a result, the spindle head 60 fixed to the turning spindle 61 turns around the turning axis B1, and the direction of the tool 43 (turning tool) is changed. At this time, it is necessary that the protrusion of the turning main shaft 61 after being indexed to rotate at a predetermined angle be in a state where it can mesh with the protrusion of the piston P.

  When the rotation index of the turning main shaft 61 is completed, the direction switching valve 71 is subsequently switched, and the hydraulic oil is supplied to the third empty chamber 67 by the hydraulic pump P1, and the piston P is lowered. At this time, the oil in the fourth empty chamber 75 is discharged to the tank T.

  A pin (not shown) can project toward the piston P from the surface of the support base body 66 having the protrusion, and the pin can be biased toward the piston P. Thus, when the pin is pushed down, the meshing states of the protrusions of the piston P, the turning main shaft 61 and the support base body 66 are confirmed, and it is determined that turning is possible. In this state, the index angle of the spindle head 60 is limited to a position where the projections of the piston P, the turning main shaft 61, and the support base body 66 can be engaged with each other. Since the main shaft 61 and the support base main body 66 can be firmly clamped, it is possible to realize processing on a workpiece that requires a large load without any trouble. The operation of firmly clamping the piston P, the turning main shaft 61 and the support base main body 66 is not limited to the turning processing, and can be applied to the rotating processing for rotating the tool main shaft 42 using a rotating tool. .

  Further, as an example of performing machining by determining the spindle head 60 at an arbitrary angle in the combined machining lathe 1, an operation at the time of rotary machining for rotating the tool spindle 42 using a rotary tool will be described. At the time of rotational processing, first, the hydraulic oil is supplied to the fourth empty chamber 75 through the direction switching valve 71 and the second oil feed pipe 72B by the hydraulic pump P1. As a result, the piston P moves upward in the axial direction of the sleeve 62. For this reason, the meshing state of the protrusions of the piston P, the turning main shaft 61 and the support base body 66 described above is released.

  Thereafter, as in the turning process described above, the spindle head 60 fixed to the turning spindle 61 turns around the turning axis B1, and the direction of the tool 43 (rotating tool) is changed. In this case, the protrusion of the turning main shaft 61 does not have to be in a state where it can mesh with the protrusion of the piston P.

  When the rotation index of the turning main shaft 61 is completed, the hydraulic oil is supplied to the hydraulic pump P2 by the hydraulic pump P1 through the electromagnetic valve 73 and the third oil feed pipe 74A. The hydraulic pump P <b> 2 increases the pressure oil and supplies the increased pressure oil to the second empty chamber 65. In this embodiment, the said pressure oil is an example of the pressurized fluid of this invention.

  Due to the pressure oil supplied to the second empty chamber 65, a pressure acting on the sleeve 62 toward the lower side in the axial direction of the sleeve 62 is applied. As a result, the sleeve 62 descends against the holding force of the plate spring 80, and the second tapered surface T2 is pressed against the first tapered surface T1.

  In the present embodiment, the second vacant chamber 65 is an example of a first pressurized fluid working chamber of the present invention. The pressure increasing valve 74 is an example of a pressing force adjusting unit of the present invention. The pressure acting toward the lower side in the axial direction of the sleeve 62 is an example of the pressing force of the present invention. The first taper surface T1 is an example of the first taper portion of the present invention, and the second taper surface T2 is an example of the second taper portion of the present invention. The sleeve 62 is an example of the sleeve member of the present invention.

  Further, the pressure oil passes through the communication portion 68 from the second empty chamber 65 and is supplied to the first empty chamber 63. Pressure is applied to the elastic member 64 by the pressure oil supplied to the first empty chamber 63. By this pressure, the elastic member 64 is elastically deformed in the direction radiating from the central axis of the turning main shaft 61 (the radial direction of the turning main shaft 61), and the elastic member 64 is in close contact with the side surface of the turning main shaft 61. Thereby, the frictional force that restricts the rotation of the turning main shaft 61 can be increased, and a braking force can be applied to the turning main shaft 61. In the present embodiment, the first empty chamber 63 is an example of a second pressurized fluid working chamber (rotation restricting mechanism) of the present invention. The elastic member 64 is an example of the rotation restricting mechanism of the present invention.

  In addition, when the pressure oil is further increased by the hydraulic pump P2, the force for pressing the second tapered surface T2 against the first tapered surface T1 increases. As the pressure oil is increased, the pressing force applied to the elastic member 64 increases. As a result, the elastic member 64 is strongly pressed against the side surface of the turning main shaft 61 and the braking force against the turning main shaft 61 is increased.

In this state, when turning the workpiece with the tool 43, the second taper surface T2 is strongly pressed against the first taper surface T1, and the elastic member 64 is provided on the side surface of the turning spindle 61. Strongly pressed against. In the present embodiment, the pressing force applied to the first tapered surface T1 by the second tapered surface T2, the brake force of the elastic member 64 applied to the pivot spindle 61, a force swivel spindle 61 is braked to be rotated Added. Therefore, in the present embodiment, the spindle head fixed to the turning spindle 61 in a state where the spindle head 60 (the tool spindle 42) is rotationally indexed at a predetermined angle by the force for braking the rotation of the turning spindle 61. The rigidity of the 60 (tool spindle 42) is increased, and chatter vibration that tends to occur during turning is suppressed. Thereby, in this embodiment, it is preventing that the process precision of the workpiece | work at the time of a turning process falls. In the multi-tasking lathe 1, at the time of rotary machining, as described above, the spindle head 60 (the tool spindle 42) is in a predetermined state with the meshing state between the piston P, the turning spindle 61 and the support base body 66 being released. Rotation indexed to an angle. For this reason, it is possible to restrict the rotation of the turning main shaft 61 even at a position where the protruding portion of the piston P and the protruding portions provided on the turning main shaft 61 and the support base body 66 do not mesh with each other.

  In the present embodiment, as shown in FIG. 3, the diamond plating layer 69 is formed on the surface of the first tapered surface T1 by fixing diamond abrasive grains to the nickel plating layer.

  In the combined machining lathe 1 of the present embodiment, it is possible to perform machining on the workpiece while rotating the turning spindle 61 around the turning axis B1. In this case, the supply of the pressure oil to the second empty chamber 65 is stopped, and the pressure oil is supplied to the fourth empty chamber 75, and the protrusions of the piston P, the turning main shaft 61, and the support base main body 66 described above. The meshing state of the part (coupling) is released.

<Operation and effect of this embodiment>
In the combined machining lathe 1, as described above, the second tapered surface T <b> 2 formed on the sleeve 62 can press the first tapered surface T <b> 1 formed on the turning main shaft 61. Thereby, the 2nd taper surface T2 can be press-contacted to the 1st taper surface T1, and a braking force can be applied with respect to the turning main shaft 61 fixed to the main shaft head 60 (tool main shaft 42).
Further, in the combined machining lathe 1, the elastic member 64 is elastically deformed in the direction radiating from the central axis of the turning main shaft 61 by the pressure oil supplied to the first empty chamber 63, and the elastic member 64 is turned. The main shaft 61 is in close contact with the side surface. Thereby, the side surface of the turning main shaft 61 can be tightened to generate a force for braking the rotation of the turning main shaft 61.
Therefore, in the combined machining lathe 1, a braking force can be applied to the turning main shaft 61 and a force for braking the rotation of the turning main shaft 61 can be generated. Therefore, the braking force and the rotation of the turning main shaft 61 can be generated. The turning spindle 61 fixed to the spindle head 60 (tool spindle 42) is fixed in a state where the spindle head 60 (tool spindle 42) is rotationally indexed at a predetermined angle by the turning spindle 61. Can be urged. For this reason, with the fixation of the turning spindle 61, the spindle head 60 (the tool spindle 42) can be urged to be fixed, and the rigidity of the tool spindle 42 can be increased.

  Further, in the combined machining lathe 1, as described above, the swivel fixed to the spindle head 60 (the tool spindle 42) by pressing the second tapered surface T2 against the first tapered surface T1 with a relatively small hydraulic pressure. A braking force can be applied to the main shaft 61 to generate a force for braking the turning main shaft 61 from rotating. For this reason, it is possible to reduce the size of the hydraulic pump of the pressure increasing valve 74 by relatively reducing the oil pressure necessary for generating the above-described braking force, and the rotation main shaft 61 is generally rotated. It is possible to reduce the size of the braking mechanism, and thus to reduce the size of the combined machining lathe 1.

  In the combined machining lathe 1, as described above, the second tapered surface T2 is pressed against the first tapered surface T1. Thereby, the 2nd taper surface T2 can be surface-contacted with respect to the 1st taper surface T1. For this reason, it becomes possible to increase the restraining force of the 2nd taper surface T2 with respect to 1st taper surface T1 according to the grade of the surface contact of both taper surfaces T1 and T2.

  In the combined machining lathe 1, the pressure oil supplied to the second empty chamber 65 is increased by the hydraulic pump P <b> 2 of the pressure increasing valve 74 as described above. As the pressure oil supplied to the second empty chamber 65 is increased, the pressure for moving the second tapered surface T2 to the first tapered surface T1 increases. By increasing the pressure for moving the second tapered surface T2 to the first tapered surface T1, the restraining force of the second tapered surface T2 on the first tapered surface T1 can be increased.

  In the composite working lathe 1, the surface of the first taper surface T1 can be subjected to a surface treatment having a high frictional resistance by the diamond plating layer 69 containing diamond grains having high hardness. Thereby, the frictional force between the first tapered surface T1 and the second tapered surface T2 can be increased. As a result, the restraining force of the second tapered surface T2 with respect to the first tapered surface T1 can be increased.

  The present invention is not limited to the embodiment described above, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. The elastic member 64 is not limited to one formed of a metal such as a steel material, and may be formed of a resin or the like as long as conditions such as strength and abrasion resistance can be satisfied.

  Further, instead of the first taper surface T1, a diamond plating layer may be formed on the second taper surface T2, or a diamond plating layer may be formed on both the first taper surface T1 and the second taper surface T2. Good.

  Further, unlike the above-described embodiment, the sleeve and the elastic member are arranged on the central axis side of the turning main shaft 61, and the elastic member is elastically deformed toward the side surface of the central axis so that the central axis It may be in close contact with the side.

  In addition, unlike the embodiment described above, the support base 41 and the support base body 66 may be formed integrally.

1 is an overall perspective view of a combined machining lathe according to an embodiment of the present invention. It is the figure which each showed the principal part cross section of the 1st tool rest, and the hydraulic circuit connected to this 1st tool rest. It is the figure which showed the state in which the diamond plating layer was formed in the 1st taper surface.

Explanation of symbols

  1 .. Complex machining lathe, 42 .. Tool spindle, 43 .. Tool, 60 .. Spindle head, 61 .. Turning spindle, 62 .. Sleeve, 63 .. First vacant space, 64 .. Elastic member, 65 .. Second vacant chamber, 66 .. Support base body, 66A .. Housing, 69 .. Diamond plating layer, 74 .. Booster valve, T1 .. First taper surface, T2.

Claims (4)

In a machine tool having a spindle head having a rotatable spindle attached with a tool for machining a workpiece, and a turning spindle fixed to the spindle head and capable of turning and indexing the spindle about a turning axis. ,
The upper side in the vertical direction corresponding to the axial direction of the turning main shaft is fixed to the main shaft head,
A sleeve member capable of advancing and retreating in the vertical direction in a housing of the headstock for supporting the turning spindle;
A first tapered portion inclined by a prescribed angle with respect to the formed in the turning spindle, the vertical direction toward the end portion in the vertical direction of said pivot spindle,
A second taper portion formed on the sleeve member and parallel to the first taper portion;
Adjacent to the sleeve member, formed between the upper surface of the sleeve member and the housing in the axial direction of the sleeve member coinciding with the vertical direction , the second taper portion is directed to the first taper portion. is moved to the lower side of the front Symbol vertically Te, a first pressurized fluid working chambers pressurized fluid for generating a pressing force which the second tapered portion presses the first tapered portion to the lower flows,
A machine tool comprising: Between the housing and the sleeve member, a rotation restricting mechanism that presses the turning main shaft in a radial direction of the turning main shaft in contact with the housing and restricts the rotation of the turning main shaft,
The rotation restricting mechanism is
A second pressurized fluid working chamber formed between the housing and the sleeve member and into which the pressurized fluid flows;
An elastic member that expands due to the pressure of the pressurized fluid and presses the swivel main shaft in a radial direction of the swivel main shaft from the housing;
The machine tool according to claim 1, comprising:   The machine tool according to claim 1, further comprising a pressing force adjusting unit that increases the pressing force by increasing the pressure of the pressurized fluid.   The machine tool according to any one of claims 1 to 3, wherein a diamond plating layer is formed on one or both of the surface of the first taper portion and the surface of the second taper portion. .

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