JP2017159394A - Rotary table device, and machine tool provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both high rotation efficiency and high holding force of a rotary table by arranging a rotary slide part, to which both relatively rotate, on a passage for transmitting action force of a piston member to a rotary table, and restraining the relative rotation.SOLUTION: A rotary table device 18 includes a support body 22, a rotary table 20, and a piston member 52. A cylinder auxiliary member 42 and the piston member 52, which are integrally formed with the support body 22, can bend in a rotary axial direction but are connected with rigidity in a rotation direction by a connection member 60. Thereby, the rotary table 20 is retrained and holding action is performed at two parts of an abutment part K between the piston member 52 and a rotation transmission auxiliary member 28 integrated with the rotary table 20, and an abutment part M between the rotary table 20 and a support body main body member 38.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary table device. And a machine tool including the rotary table device.

  Some large machine tools such as machining centers include a rotary table for installing a workpiece or a tool. The turntable is rotatably supported by a support as a base. The rotary table can be gripped with respect to the rotation direction on the support body by the acting force of the piston member.

  FIG. 6 shows a rotary table device 118 provided in a machining center and put into practical use. As shown in FIG. 6, the support body 122 is disposed in the lower part as viewed in the figure, and the rotary table 120 is disposed in the upper part. The central portion of the support 122 is a rotation base auxiliary member 140, and the rotary table 120 is supported by the rotation base auxiliary member 140 through the bearing 143, and the rotation table 120 is centered on the rotation base auxiliary member 140. Can be rotated. The rotation direction is indicated by an arrow B.

  A sliding surface 146 that slides and rotates while being placed when the rotary table 120 rotates is provided at the outer peripheral portion of the support 122. A piston member 152 that moves up and down by supplying hydraulic oil is disposed between the support 122 and the rotary table 120 between the rotation base auxiliary member 140 of the support 122 and the sliding surface 146 on the outer periphery. ing. The piston member 152 is moved upward by supplying hydraulic oil to the lower hydraulic oil chamber 164 at the lower part of the piston member 152, and the piston member 152 is driven by supplying hydraulic oil to the upper hydraulic oil chamber 162 at the upper part of the piston member 152. 152 moves downward. The vertical movement range is about 1 mm.

  The downward force of the piston member 152 is transmitted to the collar portion 128A of the rotation transmission auxiliary member 128 integrated with the rotary table 120 and the bolt 158, and attempts to lower the entire rotary table 120, 128 downward.

  With the above configuration, the acting force F indicated by the white arrow is transmitted to the flange portion 128 </ b> A of the rotation transmission auxiliary member 128 by the downward movement of the piston member 152. This acting force F is transmitted to the rotary table 120 integral with the rotation transmission assisting member 128, and is also transmitted to the sliding surface 146 at the outer peripheral portion position of the support 122 as the acting force F indicated by the white arrow. Due to the acting force F transmitted to the sliding surface 146, a frictional force is generated on the sliding surface 146, and the rotation of the turntable 120 is prevented. That is, the rotary table 120 is restrained and held by the support body 122.

  In the above-described configuration, the piston member 152 is disposed in an unconstrained state in the rotation direction with respect to the member on the support body 122 side and the member on the rotary table 120 side. For this reason, when a downward acting force acts on the piston member 152 and frictionally engages with the flange portion 128 </ b> A of the rotation transmission assisting member 128, the piston member 152 moves together with the rotary table 120. In other words, when the rotary table 120 is rotated, the piston member 152 is also rotated integrally with the rotary table 120.

JP 2008-114306 A

  In the conventional rotary table device 118 described above, in order to improve the rotation efficiency of the rotary table 120, it is necessary to reduce the coefficient of friction between the sliding surface 146 of the support 122 and the contact surface of the rotary table 120. is there. On the other hand, in order to improve the gripping force against the external force in the rotational direction of the rotary table 120, it is necessary to increase the coefficient of friction between the parts. That is, the compatibility between high rotation efficiency and high gripping force of the rotary table 120 is a conflicting issue.

  Thus, the present invention was devised in view of the above points, and the problem to be solved by the present invention is that the relative rotation between the piston member and the rotary table can be restricted. It is to achieve both high rotation efficiency and high gripping force of the rotary table.

  In order to solve the above problems, the present inventors have focused on integrating the support member 122 with the support member 122 in the rotational direction, which has been conventionally unconstrained in the rotational direction. As a result, it was conceived that the rotation of the rotary table 120 in the path for transmitting the acting force of the piston member 152 to the rotary table 120 is prevented and a gripping force is obtained. And this invention takes the following means.

  The basic configuration of the rotary table device according to the present invention is a support body serving as a base of the device, and is disposed so as to be capable of rotating and sliding on a sliding surface formed on the support body. A rotary table; and a piston member disposed so as to be able to press the rotary table in the direction of the rotation axis of the rotary table with respect to the rotary table, and the support by the pressure applied to the rotary table by the piston member It is a rotary table device that generates a restraining force in a rotational direction against the rotational sliding between a sliding surface of a body and the rotary table.

  The rotary table device includes a connecting member that connects the support and the piston member, and the connecting member can bend in the rotational axis direction of the rotary table but has rigidity in the rotational direction. The rotary table device has a structure and generates a binding force in the rotational direction of the rotary table between the pressing portions when the piston member presses the rotary table. In the present invention, the fact that the connecting member has rigidity in the rotational direction means that the relative rotation between the support and the piston member is not caused when the connecting member is substantially elastically deformed when a load in the rotational direction is applied. Refers to restraint.

  According to the present invention, first, as in the prior art, when an acting force in the direction of preventing and restraining rotation is applied to the rotary table, the rotary table rotates between the sliding surface of the rotary table and the support. An action force that prevents and restrains is generated. Thereby, first, the gripping action to the support body of a rotary table is performed.

  Furthermore, according to the present invention described above, the gripping action of the rotary table is performed as follows. That is, according to the present invention, the support body and the piston member are coupled by the coupling member, and are integrated in the rotation direction of the rotary table, and the piston member is displaceable in the rotation axis direction. Since the piston member is integrated with the support body as the base of the apparatus and is a non-rotating member, the rotation of the rotating table is prevented and restrained between the pressing portion surfaces that press the rotating table by the piston member. Produce power. Accordingly, the gripping action of the rotary table to the support is also performed by this action force.

  According to the present invention, as described above, it is possible to perform the action of preventing and restricting the rotation of the rotary table at two positions at different positions, and a high gripping force on the support can be obtained.

  According to the present invention, when the acting force in the direction of restraining rotation by the piston member is not applied between the pressing portion surfaces that press the rotary table by the piston member, the pressing portion surfaces are in a floating state. Become. That is, the bending action of the connecting member is returned and a play gap is generated between the pressing portion surfaces. As a result, the rotary table can rotate with little sliding resistance, resulting in high rotational efficiency.

  The rotary table device of the present invention can have the following configuration as a preferable configuration.

  First, in the above-described rotary table device, the connecting member that connects the support and the piston member is between the connecting portion of the piston member and the connecting portion of the support with respect to the rotational axis direction of the rotary table. It is preferable to have a structure having a thin wall portion for facilitating bending. According to such a structure, the relative displacement movement with respect to the support body accompanying the up-and-down movement of the piston member is easily performed with little resistance by the thin portion.

  Next, it is preferable that the thin portion of the connecting member has a shape that does not interfere with the support when the connecting member is bent. When the connecting member has such a shape, it does not interfere with the support when the connecting member is bent, and can be used for a long time without being damaged.

  Next, it is preferable that fatigue life improving means is applied to the connecting member in the rotary table device described above. By applying the fatigue life improving means, the fatigue life of the connecting member can be improved.

  Next, the above-mentioned fatigue life improving means is preferably shot peening. Since shot peening is a popular method, stable performance can be obtained.

  Next, in the above-mentioned rotary table device, the friction coefficient between the two pressing the rotary table by the piston member is larger than the friction coefficient between the contact surface with the rotary table in the sliding surface formed on the support. Preferably it is set. When the friction coefficient is set in this way, it is possible to achieve better both high rotation efficiency and high gripping force of the rotary table.

  Next, in the rotary table device described above, it is preferable that friction reducing means is provided between the contact surfaces of the sliding surface formed on the support and the rotary table. When the friction reducing means is provided in this way, the rotational sliding resistance of the part can be reduced, and higher rotational efficiency can be improved.

  The friction reducing means is preferably a sliding material made of oil-impregnated resin. According to the sliding material made of oil-impregnated resin, it is possible to effectively reduce friction and contribute to high rotational efficiency.

  The rotary table device described above can be provided in various machine tools.

  According to the present invention, a rotary sliding portion in which both of them rotate relative to each other in a path for transmitting the acting force of the piston member to the rotary table is set, and the high rotation of the rotary table is achieved by preventing and restraining the relative rotation. Both efficiency and high gripping force can be achieved.

It is a whole perspective view which shows the machining center provided with the turntable apparatus of this embodiment. It is a half cut sectional view showing the turntable device of this embodiment. It is a top view of the connection member of this embodiment. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged view of a V arrow portion of FIG. 4. It is a half-cut sectional view showing a conventional rotary table device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a rotary table device provided in a machining center will be described.

  FIG. 1 shows a four-axis machining center 10 equipped with a rotary table device 18. The machining center 10 is a machine tool having three linear axes and one rotary axis. The machining center 10 includes a bed 11, a Z-axis moving column 12, a Y-axis moving body 13, a quill main shaft 14, a tool 15, an X-axis moving table 16, and a rotary table 20.

  The bed 11 has a flat T-shape and is installed on the floor. The Z-axis movement column 12 is disposed on the bed 11 so as to be movable on the bed 11 in the Z-axis direction. The Y-axis moving body 13 is disposed on the Z-axis moving column 12 so as to be movable in the Y-axis direction with respect to the Z-axis moving column 12. The quill main shaft 14 is disposed on the Y-axis moving body 13 so as to be able to swing (rotate) in the A rotation direction with respect to the Y-axis moving body 13. The quill main shaft 14 includes a rotatable main shaft. The tool 15 is fixed to the tip of the main shaft of the quill main shaft 14 and rotates as the main shaft rotates.

  The X-axis moving table 16 is disposed on the bed 11 so as to be movable on the bed 11 in the X-axis direction. The X-axis moving table 16 has a rotation mechanism that can rotate in the B rotation direction. The rotary table 20 is fixed to the upper end of the rotation mechanism of the X-axis moving table 16. That is, the rotary table 20 can rotate in the B rotation direction with respect to the X-axis movement table 16. A workpiece W is attached to the upper surface of the turntable 20. Note that the X axis, the Y axis, and the Z axis shown in FIG. 1 are orthogonal to each other, and the Y axis direction indicates a vertically upward direction.

  Next, an embodiment of the rotary table device 18 will be described based on FIG. In addition, illustration of the rotary table apparatus 18 in FIG. 1 has shown the outline arrangement | positioning state as an image, and is the structure shown in detail in FIG. 2 is a member corresponding to the X-axis moving table 16 of the machining center shown in FIG.

  In FIG. 2, the rotary table 20 is rotatably supported by a support body 22, and its rotation is constrained so that the rotary table 20 is gripped by the support body 22.

The rotary table 20 includes a table main body member 24 and a rotation transmission auxiliary member 28. These members 24 and 28 are arranged in an annular shape around the rotation axis C of the rotary table device 18. The rotation transmission auxiliary member 28 is disposed at the lower surface side position of the table main body member 24. The rotation transmission assisting member 28 is coupled to and integrated with the table body member 24 by bolts 34.

  The support 22 includes a support main body member 38, a rotation base auxiliary member 40, and a cylinder auxiliary member 42. These members 38, 40, 42 are arranged in an annular shape around the rotation axis C of the rotary table device 18. The rotation base auxiliary member 40 is disposed at the position of the rotation axis C of the rotary table device 18 and at the inner peripheral side position of the support body member 38. The cylinder auxiliary member 42 is located on the upper surface side of the support body member 38 and is disposed between the rotation base axis auxiliary member 40 of the rotary table 20 and a piston member 52 described later.

The auxiliary members 40 and 42 are integrated with the support body member 38 by bolts or the like. The rotating shaft auxiliary member 40 is coupled to and integrated with the support body member 38 by fastening means (not shown). The cylinder auxiliary member 42 is coupled to and integrated with the support body member 38 by a bolt 39.

  The rotary table 20 and the support body 22 described above have a rotation base auxiliary member 40 of the support body 22 formed in a shaft shape, and are fitted to the member 40 via a bearing 43 so that the rotary table 20 rotates. It is possible. More specifically, a bearing 43 is disposed on the upper end shaft portion 40A of the rotation base auxiliary member 40 so that the rotation table 20 can be smoothly rotated.

  As shown in FIG. 2, the upper surface of the support body member 38 in the lower part of the right side position of the table body member 24 is a sliding surface 46 that slides and rotates with the table body member 24. The rotary table 20 slides and rotates on the sliding surface 46 of the support 22.

  The rotation of the rotary table 20 is applied by a power transmission mechanism of a worm gear 48 and a worm wheel 50 that are mounted on the lower right side of the rotation transmission auxiliary member 28 as viewed in FIG. The worm gear 48 is supplied with the rotational power of a rotational power source such as an electric motor (not shown).

  The piston member 52 is fitted and disposed at the outer peripheral position of the cylinder auxiliary member 42. The piston member 52 and the cylinder auxiliary member 42 are connected to each other by a connecting member 60 at the upper surface position as viewed in FIG. The connecting member 60 is coupled to the cylinder auxiliary member 42 by a bolt 55 and is coupled to the piston member 52 by a bolt 56. Although the detailed structure of the connecting member 60 will be described later, it is rigidly coupled in the rotational direction, and is coupled to the rotational axis direction (vertical direction as viewed in FIG. 2) C of the rotary table device 18 so that it can be flexibly deformed. ing. As a result, the piston member 52 is movable relative to the cylinder auxiliary member 42 in the rotational axis direction. In this embodiment, the relative displacement movement amount is about 1 mm.

  The piston member 52 has a stepped cross section. Upper and lower hydraulic oil chambers 62 and 64 are formed at the position of the middle step of the staircase shape and the position of the lowermost surface. The middle step is the upper hydraulic oil chamber 62. The upper hydraulic oil chamber 62 is supplied with hydraulic oil through an oil passage 66 formed in the cylinder auxiliary member 42. Reference numeral 54 denotes a closing plug for the oil passage 66.

  The position of the lowermost surface of the piston member 52 is a lower hydraulic oil chamber 64. The upper hydraulic oil chamber 62 is supplied with hydraulic oil through an oil passage 70 formed in the support body member 38. The supply and discharge to the upper and lower hydraulic oil chambers 62 and 64 are switched by a switching valve or the like. Further, the area of the upper and lower hydraulic oil chambers 62 and 64 in this embodiment is formed so that the area of the upper hydraulic oil chamber 62 is larger than the area of the lower hydraulic oil chamber 64.

  Therefore, according to the arrangement configuration of the piston member 52 described above, the following acting force (pressing force) is generated in the piston member 52. First, when hydraulic fluid is supplied to the upper hydraulic fluid chamber 62 and hydraulic fluid in the lower hydraulic fluid chamber 64 is discharged, the piston member 52 is directed downward (indicated by the white arrow on the piston member 52 in FIG. 2). Direction) acting force (pressing force) F is generated. Conversely, in the state where the hydraulic oil is supplied to the lower hydraulic oil chamber 64 and the hydraulic oil in the upper hydraulic oil chamber 62 is discharged, an upward acting force is generated in the piston member 52. This downward acting force is set to be larger due to the difference in the area between the upper and lower hydraulic oil chambers 62 and 64 described above.

  3 to 5 show the configuration of the connecting member 60. As shown in FIG. 3, the connecting member 60 has a disk shape with a cross-sectional donut shape with the center cut out. As shown in FIGS. 4 and 5, the doughnut-shaped inner peripheral portion 60A and the outer peripheral portion 60B are formed in the thick portion 60X as viewed relatively, but between the inner peripheral portion 60A and the outer peripheral portion 60B. The intermediate portion 60C is formed in the thin portion 60Y. The thin portion 60Y is formed by forming a concave shape between the thick portions 60X on the inner and outer periphery. Thus, the bending deformation of the connecting member 60 in the rotation axis direction can be easily performed. The concave shape of the thin portion 60Y is formed by cutting.

  As described above, the connecting member 60 has the inner peripheral part 60A and the outer peripheral part 60B as the thick part 60X, and the intermediate part 60C as the thin part 60Y. This configuration contributes to the characteristic that the connecting member 60 can be bent in the rotation axis direction but has rigidity in the rotation direction. Here, the fact that the connecting member 60 has rigidity in the rotational direction means that when the connecting member 60 is loaded in the rotational direction, the connecting member 60 rotates in the rotational direction without substantially elastic deformation. Points to the state. This state means that, when a design rotation direction maximum load is applied to the connecting member 60, the connecting member 60 has a rigidity that allows the elastic deformation amount of the connecting member 60 to be within the allowable deformation amount in the rotating direction.

As shown in FIG. 2, the concave portion of the thin portion 60 </ b> Y is disposed in a state where the concave shape faces the cylinder auxiliary member 42. Thereby, when the piston member 52 is displaced downward, it is possible to prevent the connecting member 60 from interfering with the upper surface of the cylinder auxiliary member 42. For this reason, the connecting member 60 can be used for a long time without being damaged.

  The connecting member 60 can be bent in the direction of the rotation axis of the rotary table device 18, but is made of a steel material from the viewpoint of characteristics that have rigidity in the rotation direction and cost. In this embodiment, it is S45C. Further, as the piston member 52 is displaced and moved, the connecting member 60 is repeatedly deflected and displaced, resulting in fatigue. Therefore, it is necessary to improve the fatigue life. For this reason, in this embodiment, shot peening S was applied to the thin-walled portion 60Y of the inner and outer peripheral portions of the connecting member 60 as fatigue life improving means. The locations where this shot peening S is applied are indicated by broken lines in FIG. The shot peening S may be applied to the entire surface of the connecting member 60 for ease of processing. However, since the processing cost of the shot peening S is proportional to the area, it is limited to the necessary part from the viewpoint of cost. Is preferred.

  As other means for improving the fatigue life of the connecting member 60, there are a method of tempering the quenching hardness and a method of making the material of the connecting member 60 a material having high fatigue strength. For example, it may be a bearing steel or carbon composite that has been baked.

  As well shown in FIGS. 3 and 5, the connecting member 60 has a plurality of bolt passage holes 51 formed at equal intervals in the inner peripheral portion 60 </ b> A. Similarly, a plurality of bolt insertion holes 57 into which the bolts 56 are inserted are formed at equal intervals in the outer peripheral portion 60B. In the present embodiment, 20 bolt insertion holes 51 and 57 are formed. In this embodiment, the bolt insertion hole 51 of the inner peripheral part 60A and the bolt insertion hole 57 of the outer peripheral part 60B are at the same radial position from the center position O, as shown in FIG. Has been placed.

  Returning to FIG. 2, the interconnection relationship between the piston member 52 and the rotary table 20 will be described. The rotation transmission auxiliary member 28 of the turntable 20 is formed with a flange portion 28A that protrudes leftward as viewed in FIG. A right lower end 52A of the piston member 52 is disposed in contact with the flange 28A by a predetermined width. Thereby, the downward force of the piston member 52 (the force F of the white arrow) is transmitted to the rotation transmission assisting member 28 (the rotary table 20) via the contact portion K between the two members 28A and 52A.

  In addition, the contact part K of both 28A and 52A is a switching site | part which restrains rotation or makes rotation free by the presence or absence of both 28A and 52A contact. The rotation is constrained in the contact state, and the rotation is free in the non-contact state. That is, since the piston member 52 is integrated with the non-rotating cylinder auxiliary member 42 by the connecting member 60, the piston member 52 becomes a relative rotation location when the rotary table 20 is in a rotating state. When the contact acting force is exerted on the abutting portion K, the rotating table 20 is prevented from rotating. Therefore, the downward acting force of the piston member 52 acts as an acting force for preventing and restricting the rotation of the rotary table 20.

  Further, the downward acting force transmitted to the rotary table 20 is indicated by a white arrow on the sliding surface 46 of the support body member 38 formed on the lower right side of the table body member 24 as seen in FIG. The acting force F acts as an acting force that restricts the rotation of the turntable 20. Sliding members 72 and 74 are disposed at the contact portions M between the sliding surface 46 and the lower surface of the table main body member 24, respectively. A first sliding member 72 is disposed on the sliding surface 46, and a second sliding member 74 is disposed on the lower surface of the table body member 24.

  In the present embodiment, the friction coefficient between the contact portion K and the contact portion M is configured so that the contact portion K is in a larger state than the contact portion M. For this reason, the contact part M is formed by friction reducing means, and each contact part K, M is configured as follows. First, as for the contact part K, the main-body part of the piston member 52 is steel. On the other hand, the rotation transmission auxiliary member 28 having the flange portion 28A is made of ductile cast iron. Next, in the contact portion M formed by the friction reducing means, the first sliding member 72 of the sliding surface 46 is a sliding material made of oil-impregnated resin. The thickness of the first sliding member 72 is 1 to 1.2 mm. The second sliding member 74 of the table main body member 24 is made of steel. The support 22 as a base is made of cast iron. As a result of the above configuration, in the present embodiment, the friction coefficient of the contact portion K is 0.1 to 0.3, and the friction coefficient of the contact portion M is 0.02 to 0.05.

  Next, the operation of the rotary table device 18 according to the above-described embodiment will be described with reference to FIG.

  First, in a state where the turntable 20 on which the workpiece W is placed is rotated, hydraulic oil is supplied through the oil passage 70 to the lower hydraulic oil chamber 64 below the piston member 52. In this state, the hydraulic oil in the upper hydraulic oil chamber 62 above the piston member 52 is discharged through the oil passage 66. Such supply / discharge control of the hydraulic oil is performed by an oil passage switching valve (not shown). In this state, an upward acting force is generated in the piston member 52 by the hydraulic oil supplied to the lower hydraulic oil chamber 64.

  Due to the upward acting force generated in the piston member 52, the piston member 52 is in a floating state in a non-contact state with the rotary table 20. That is, the piston member 52 moves upward by an upward acting force. This movement is easily performed by allowing the connecting member 60 to bend in the rotation axis direction. By this upward movement, the contact portion K between the piston member 52 and the flange portion 28A of the rotation transmission assisting member 28 is separated. As a result, the rotary table 20 is placed on the sliding surface 46 of the support body member 38. However, since no downward acting force acts on the rotary table 20, the rotary table 20 rotates relative to the support body 22. It is in a free rotation state with a low coefficient of friction that is not constrained in direction.

  In the rotation free state of the rotary table 20, the rotary table 20 is rotated through the rotation transmission mechanism of the worm gear 48 and the worm wheel 50 by driving a rotational power source such as an electric motor (not shown). Thereby, the workpiece W placed on the rotary table 20 can be set to a predetermined phase.

  The rotary table 20 is in a freely rotating state in which the rotary table 20 rotates and slides on the sliding surface 46 while the rotary table 20 is mounted on the sliding surface 46 of the support body member 38. However, since the friction coefficient on the sliding surface 46 is set low, the rotation of the turntable 20 is performed with high rotation efficiency.

  Next, the operation of preventing the rotation of the rotary table 20 and restraining it by the support 22 will be described. In a state where the rotary table 20 is held and held by the support 22, the hydraulic oil is supplied to the upper hydraulic oil chamber 62 above the piston member 52 through the oil passage 66. On the contrary, in this state, the hydraulic oil in the lower hydraulic oil chamber 64 below the piston member 52 is discharged. As a result, a downward acting force F indicated by a white arrow is generated in the piston member 52 by the hydraulic oil supplied to the upper hydraulic oil chamber 62.

  The downward acting force F generated in the piston member 52 pushes the flange portion 28A of the rotation transmission assisting member 28 downward through the contact portion K. At this time, the rotation transmission assisting member 28, that is, the rotary table 20 is prevented from rotating and restrained. That is, in the abutting portion K, the non-rotating piston member 52 rotates and slides against the rotating flange portion 28A with the acting force F, whereby a frictional force that prevents rotation is exerted. Thereby, the rotation of the rotary table 20 is prevented and restrained, and the piston member 52 is gripped by the support body 22.

  In particular, in this embodiment, the friction coefficient of the contact portion K is set larger than that of the contact portion M, and the area of the upper hydraulic oil chamber 62 is formed larger than that of the lower hydraulic oil chamber 64. Has been. As a result, a large frictional force that prevents rotation can be generated in the contact portion K, and the rotary table 20 can be restrained and gripped.

  Further, when the rotation transmission assisting member 28 is pushed downward by the contact portion K, the entire rotary table 20 also moves downward. Due to the downward movement of the turntable 20, the abutment portion M described above also acts to prevent the turntable 20 from rotating. By this action, the rotary table 20 is restrained and held by the support 22. In other words, in the contact portion M, the rotating table 20 in a rotating state is in rotational sliding contact with the non-rotating support 22 by the acting force F, and a frictional force that prevents rotation is exerted. Thereby, the rotation of the rotary table 20 is prevented and restrained, and the piston member 52 is gripped by the support body 22.

  As described above, in the present embodiment, the action of preventing the rotation of the turntable 20 and restraining and holding the turntable 20 by the support 22 is performed at two locations of the contact portion K and the contact portion M. Thereby, the rotary table 20 can be restrained with a high gripping force.

  As mentioned above, although this invention was demonstrated about specific embodiment, this invention can be implemented also with other various forms.

  For example, in the above-described embodiment, the machining center 10 has been described as a representative example of a machine tool. The rotary table device 18 of the present invention can also be applied to various machine tools such as a grinding machine.

  Further, in the above-described embodiment, the position of the contact portion K is the inner peripheral side position, and the position of the contact portion M is the outer peripheral side position, but an opposite arrangement form is also possible.

  Moreover, although the integration means of each site | part in the above-mentioned embodiment is performed with fasteners, such as a volt | bolt, other means, such as welding and adhesion | attachment, may be sufficient.

  Further, in the above-described embodiment, the hydraulic oil is used as the operating pressure for moving the piston member 52 up and down, but air may be used.

DESCRIPTION OF SYMBOLS 10 Machining center 11 Bed 12 Z-axis movement column 13 Y-axis moving body 14 Quill spindle 15 Tool 16 X-axis moving table (support body)
DESCRIPTION OF SYMBOLS 18 Rotary table apparatus 20 Rotary table 22 Support body 24 Table main body member 28 Rotation transmission auxiliary member 28A A collar part 30 Cover auxiliary member 38 Support body main body member 40 Rotating base axis auxiliary member 42 Cylinder auxiliary member 43 Bearing 46 Sliding surface 48 Worm gear 50 Warm Wheel 52 Piston member 54 Closure stopper 60 Connecting member 60A Inner peripheral portion 60B Outer peripheral portion 60C Intermediate portion 60X Thick portion 60Y Thin portion 62 Upper hydraulic chamber 64 Lower hydraulic chamber 66 Oil passage 70 Oil passage 72 First sliding member 74 Second sliding member B Rotation direction of rotary table C Rotational axis direction of rotary table W Workpiece K Contact part M Contact part S Shot peening

Claims (10)

A support as a base for the device;
A rotating table disposed so as to be able to rotate and slide on a sliding surface formed on the support;
A piston member disposed so as to be capable of pressing the rotary table in the direction of the rotation axis of the rotary table with respect to the rotary table;
In the rotary table device that generates a binding force in the rotational direction against the rotary sliding between the sliding surface of the support and the rotary table by the pressure applied to the rotary table by the piston member,
A connecting member for connecting the support and the piston member;
The connecting member is a structure that can be bent in the rotation axis direction of the rotary table but has rigidity in the rotation direction,
A rotary table device that generates a restraining force in the rotational direction of the rotary table even between the pressing portions when the piston member is pressed against the rotary table. The rotary table device according to claim 1,
The connecting member that connects the support member and the piston member is provided with a thin portion between the connecting portion of the piston member and the connecting portion of the support member so as to bend easily in the rotation axis direction of the rotary table. A rotary table device. The rotary table device according to claim 2,
The thin part of the connecting member is a rotary table device having a shape that does not interfere with the support when the connecting member is bent. The rotary table device according to claim 3,
The shape of the connecting member that does not interfere with the support when bent by the thin portion of the connecting member is formed such that the thin portion of the connecting member is recessed in the direction away from the support with respect to the axial direction. . The rotary table device according to any one of claims 1 to 4,
A rotary table device, wherein the connecting member is provided with means for improving fatigue life. The rotary table device according to claim 5,
The rotary table apparatus, wherein the fatigue life improving means is shot peening. The turntable device according to any one of claims 1 to 6,
A rotary table device in which a friction coefficient between the two pressing the rotary table by the piston member is set to be larger than a friction coefficient between contact surfaces of the sliding surface formed on the support and the rotary table. The turntable device according to any one of claims 1 to 7,
A rotary table device in which friction reducing means is provided between contact surfaces of the sliding surface formed on the support and the rotary table. The rotary table device according to claim 8,
The rotary table device, wherein the friction reducing means on the sliding surface formed on the support is a sliding material made of oil-impregnated resin.   A machine tool comprising the rotary table device according to any one of claims 1 to 9.

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