JP6686554B2 - Rotary table device and machine tool equipped with the device - Google Patents

Description

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

  Some large-scale machine tools such as machining centers are equipped with a rotary table for installing a work piece or a tool. The turntable is rotatably mounted on and supported by a support as a base. The rotary table can be held by the support body in the rotational direction 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 arranged in the lower portion as viewed in the figure, and the turntable 120 is arranged in the upper portion. The central portion of the support body 122 serves as the rotation base shaft auxiliary member 140, and the inner peripheral cylindrical portion of the rotary table 120 is supported by the rotation base shaft auxiliary member 140 via the bearing 143. Can be rotated as. The direction of rotation is indicated by the arrow B.

  A sliding surface 146 is provided at an outer peripheral position of the support body 122 so as to slide and rotate while being placed when the turntable 120 rotates. A piston member 152 that moves up and down due to the supply of 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 of the outer peripheral portion. ing. By supplying hydraulic oil to the lower hydraulic oil chamber 164 below the piston member 152, the piston member 152 moves upward, and by supplying hydraulic oil to the upper hydraulic oil chamber 162 above the piston member 152, the piston member 152 moves down. The vertical movement range is about 1 mm.

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

  With the above configuration, the downward movement of the piston member 152 causes the acting force F indicated by the white arrow to be transmitted to the flange portion 128A of the rotation transmission auxiliary member 128. This acting force F is transmitted to the rotary table 120 integrated with the rotation transmission assisting member 128, and is also transmitted to the sliding surface 146 at the outer peripheral position of the support body 122 as the acting force F indicated by a white arrow. By the acting force F transmitted to the sliding surface 146, a frictional force is generated on the sliding surface 146, and rotation of the rotary table 120 is blocked. That is, the turntable 120 is held by being held by the support 122.

  In the above configuration, the piston member 152 is also arranged in the 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. Therefore, when a downward acting force acts on the piston member 152 and frictionally engages with the flange portion 128A of the rotation transmission auxiliary member 128, the piston member 152 moves together with the rotary table 120. That is, in the rotating state of the rotary table 120, the piston member 152 also rotates together with the rotary table 120.

JP, 2008-114306, A

  In the above-described conventional rotary table device 118, in order to improve the rotation efficiency of the rotary table 120, it is necessary to reduce the friction coefficient 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 rotating direction of the rotary table 120, it is necessary to increase the friction coefficient between the parts. That is, compatibility between high rotation efficiency and high gripping force of the rotary table 120 is a contradictory issue.

  Thus, the present invention was created in view of the above points, and the problem to be solved by the present invention is to make it possible to restrain the relative rotation between the piston member and the rotary table. , To achieve both high rotation efficiency and high gripping force of the rotary table.

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

The rotary table device according to the present invention has a basic configuration in which a support as a base of the device and a slide surface formed on the support are rotatably slidable with respect to the support. A rotary table; and a piston member arranged 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, and the support is provided by the pressure applied to the rotary table by the piston member. A rotary table device that generates an action force that restrains rotation on the sliding surface between the sliding surface of the body and the rotary table.

The rotary table device includes a connecting member that connects the support member and the piston member, and the connecting member is flexible in the rotation axis direction of the rotary table but has rigidity in the rotation direction. The rotary table device has a structure, and when the piston member presses the rotary table, an acting force that restrains the rotation of the rotary table is generated between the pressing portions of the two. In the present invention, the connection member having rigidity in the rotation direction means that the connection member does not substantially elastically deform when a load in the rotation direction is applied, and the relative rotation between the support member and the piston member is prevented. Refers to being restrained.

  According to the above-mentioned present invention, first, as in the prior art, when the action force in the direction of blocking and restraining the rotation by the piston member is applied to the rotary table, the rotary table is rotated between the sliding surface of the rotary table and the support body. An action force that blocks and restrains is generated. As a result, first, the holding action of the rotary table on the support body is performed.

  Further, according to the present invention described above, the gripping action of the rotary table is also performed as follows. That is, according to the present invention, the support member and the piston member are connected by the connecting member to be integrated in the rotational direction of the rotary table, and the piston member is displaceable in the rotational axis direction. Since the piston member is made into a non-rotating member by being integrated with a support serving as a base of the apparatus, an action of blocking and restraining rotation of the rotating table is provided between the pressing portion surfaces that press the rotating table by the piston member. Generate force. Therefore, also by this acting force, the holding action of the rotary table on the support body is performed.

  According to the present invention, as described above, the rotation table can be prevented from rotating and restrained at two different positions, and a high gripping force with respect to the support can be obtained.

  According to the present invention, when no acting force in the direction of restraining the rotation by the piston member is 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 restored, and a play gap is formed between the pressing portion surfaces. As a result, the rotary table can rotate with less sliding resistance, resulting in high rotation efficiency.

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

  First, in the above-described rotary table device, the connecting member that connects the support member and the piston member is disposed between the connecting portion of the piston member and the connecting portion of the support member with respect to the rotation axis direction of the rotating table. It is preferable to have a thin wall portion for facilitating bending. According to such a configuration, the thin-walled portion facilitates relative displacement movement with the support member due to the vertical movement of the piston member with less resistance.

  Next, it is preferable that the thin portion of the above-mentioned 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 bends, and it can be used for a long time without being damaged.

  Next, it is preferable that the connecting member in the above-described rotary table device is provided with fatigue life improving means. By providing 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 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 on the sliding surface formed on the support body. It is preferably set. When the friction coefficient is set in this way, both high rotation efficiency and high gripping force of the rotary table can be better achieved.

  Next, in the above-described rotary table device, it is preferable that a friction reducing means is provided between the sliding surface formed on the support and the contact surface with the rotary table. When the friction reducing means is provided in this manner, it is possible to reduce the rotational sliding resistance of the portion, and it is possible to improve the rotational efficiency.

  The above-mentioned friction reducing means is preferably a sliding member made of oil-impregnated resin. The sliding member made of the oil-impregnated resin can effectively reduce friction and contribute to high rotation efficiency.

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

  According to the present invention, a rotary sliding portion that relatively rotates the both is set in a path for transmitting the acting force of the piston member to the rotary table, and the relative rotation is blocked and restrained, whereby a high rotation of the rotary table is achieved. It is possible to achieve both high efficiency and high gripping force.

It is the whole perspective view showing a machining center provided with a turntable device of this embodiment. It is a half-cut sectional view showing a rotary table device of the present embodiment. It is a top view of the connecting member of this embodiment. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. It is an enlarged view of the V arrow view part of FIG. It is a half-cut sectional view showing a conventional rotary table device.

  Embodiments of the present invention will be described below with reference to the drawings. In this 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 rectilinear 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 spindle 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 moving column 12 is arranged 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 arranged in 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 spindle 14 is arranged on the Y-axis moving body 13 so as to be capable of swinging (rotating) 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 arranged 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 capable of rotating in the B rotation direction inside. The rotary table 20 is fixed to the upper end of the rotary mechanism of the X-axis moving table 16. That is, the rotary table 20 is rotatable in the B rotation direction with respect to the X-axis moving table 16. A workpiece W is attached to the upper surface of the rotary table 20. Note that the X axis, Y axis, and Z axis shown in FIG. 1 are orthogonal to each other, and the Y axis direction is vertically upward.

  Next, an embodiment of the rotary table device 18 will be described with reference to FIG. It should be noted that the illustration of the rotary table device 18 in FIG. 1 shows a schematic arrangement state as an image, and the configuration is shown in detail in FIG. The support 22 as a base of the rotary table device 18 shown 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 turntable 20 is rotatably supported by the support 22, and its rotation is restrained so that the turntable 20 is gripped by the support 22.

The rotary table 20 includes a table body member 24 and a rotation transmission auxiliary member 28. Each of these members 24 and 28 is annularly arranged around the rotation axis C of the rotary table device 18. The rotation transmission auxiliary member 28 is arranged at a position on the lower surface side of the table body member 24. The rotation transmission assisting member 28 is connected to the table main body member 24 by a bolt 34 so as to be integrated.

  The support 22 includes a support body member 38, a rotation base shaft auxiliary member 40, and a cylinder auxiliary member 42. Each of these members 38, 40, 42 is annularly arranged around the rotation axis C of the rotary table device 18. The rotation base shaft auxiliary member 40 is arranged at the position of the rotation axis C of the rotary table device 18 and at the position on the inner peripheral side of the support body member 38. The cylinder auxiliary member 42 is located at the position on the upper surface side of the support body member 38, and is arranged between the rotary base shaft auxiliary member 40 of the rotary table 20 and a piston member 52 described later.

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

  The above-described rotary table 20 and the support 22 have a rotation base auxiliary member 40 of the support 22 formed in a shaft shape, and are fitted to this member 40 via a bearing 43, so that the rotary table 20 rotates. It is possible. More specifically, a bearing 43 is provided 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 at the lower portion 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 on the sliding surface 46 of the support 22 to rotate.

  The rotation of the rotary table 20 is imparted by the power transmission mechanism of the worm gear 48 and the worm wheel 50 which are provided at the lower right position of the rotation transmission auxiliary member 28 in FIG. Rotational power from a rotational power source such as an electric motor (not shown) is transmitted to the worm gear 48.

  The piston member 52 is arranged so as to be fitted to the outer peripheral position of the cylinder auxiliary member 42. The piston member 52 and the cylinder auxiliary member 42 are connected by a connecting member 60 at the upper surface positions of each other as viewed in FIG. The connecting member 60 is connected to the cylinder auxiliary member 42 by a bolt 55, and is connected to the piston member 52 by a bolt 56. Although the detailed structure of the connecting member 60 will be described later, the connecting member 60 is rigidly connected in the rotation direction, and is flexibly deformable in the rotation axis direction C of the rotary table device 18 (vertical direction in FIG. 2). 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 is formed in 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 position of the middle step is the upper hydraulic oil chamber 62. The hydraulic oil is supplied to the upper hydraulic oil chamber 62 through an oil passage 66 formed in the cylinder auxiliary member 42. Reference numeral 54 is a closing plug of the oil passage 66.

  The lowermost position of the piston member 52 is the lower hydraulic oil chamber 64. The hydraulic oil is supplied to the upper hydraulic oil chamber 62 through an oil passage 70 formed in the support body member 38. The supply / discharge of the upper and lower hydraulic oil chambers 62, 64 can be switched by a switching valve or the like. Further, in the areas of the upper and lower hydraulic oil chambers 62 and 64 in the present embodiment, the area of the upper hydraulic oil chamber 62 is formed to be 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, in a state in which the hydraulic oil is supplied to the upper hydraulic oil chamber 62 and the hydraulic oil in the lower hydraulic oil chamber 64 is discharged, the piston member 52 is directed downward (indicated by a white arrow in the piston member 52 in FIG. 2). Directional force (pressing force) F is generated. On the contrary, when 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. The acting force in the vertical direction is set to be larger than the acting force in the downward direction due to the area difference between the upper and lower hydraulic oil chambers 62 and 64.

  3 to 5 show the structure of the connecting member 60. As shown in FIG. 3, the connecting member 60 has a disk shape having a doughnut-shaped cross section whose center is hollow. As shown in FIGS. 4 and 5, the inner peripheral portion 60A and the outer peripheral portion 60B, which are doughnut-shaped, are formed in the thick portion 60X when 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 inner and outer thick portions 60X. This facilitates flexural deformation of the connecting member 60 in the direction of the rotation axis. The concave shape of the thin portion 60Y is formed by cutting.

  As described above, in the connecting member 60, the inner peripheral portion 60A and the outer peripheral portion 60B are the thick portion 60X, and the intermediate portion 60C is the thin portion 60Y. This configuration contributes to the characteristic that the connecting member 60 can bend in the rotation axis direction but has rigidity in the rotation direction. Here, the connection member 60 having rigidity in the rotation direction means that the connection member 60 rotates in the rotation direction without being substantially elastically deformed when a load in the rotation direction is applied to the connection member 60. Refers to the state. This state means that the connecting member 60 has such rigidity that the elastic deformation amount in the rotating direction of the connecting member 60 is within the allowable deforming amount in the rotating direction when the maximum load in the rotating direction is applied to the connecting member 60.

The thin portion 60 </ b> Y is arranged in a concave shape such that the concave shape faces the cylinder auxiliary member 42, as shown in FIG. 2. As a result, when the piston member 52 is displaced downward, it is possible to prevent the coupling member 60 from interfering with the upper surface of the cylinder auxiliary member 42. Therefore, the connecting member 60 can be used for a long period of time without being damaged.

  The connecting member 60 is bendable in the direction of the rotation axis of the rotary table device 18, but is made of steel from the viewpoint of cost and rigidity, which is required to have rigidity in the rotating direction. In this embodiment, it is S45C. Further, as the piston member 52 is displaced and moved, the connecting member 60 is repeatedly flexed and displaced, and fatigue occurs. Therefore, it is necessary to improve the fatigue life. Therefore, in the present embodiment, shot peening S is applied to the thin wall portion 60Y on the inner and outer peripheral portions of the connecting member 60 as a fatigue life improving means. A portion where the shot peening S is applied is shown by a broken line in FIG. Note that the shot peening S may be applied to the entire surface of the connecting member 60 for ease of processing, but since the processing cost of the shot peening S is proportional to the area, the shot peening S should be limited to necessary parts from the viewpoint of cost. Is preferred.

  Other methods for improving the fatigue life of the connecting member 60 include a method of adjusting the quenching hardness and a method of making the connecting member 60 a material having high fatigue strength. For example, it may be hardened bearing steel or carbon composite.

  As shown in FIGS. 3 and 5, the coupling member 60 has a plurality of bolt through holes 51 through which the bolts 55 are inserted, formed in the inner peripheral portion 60A thereof at equal intervals. Similarly, a plurality of bolt insertion holes 57, into which the bolts 56 are inserted, are formed in the outer peripheral portion 60B at equal intervals. In this embodiment, each of the bolt insertion holes 51 and 57 is formed in 20 pieces. Then, in the present embodiment, as shown in FIG. 3 in only one place, the bolt insertion hole 51 of the inner peripheral portion 60A and the bolt insertion hole 57 of the outer peripheral portion 60B are located at the same radial position from the center position O. It is arranged.

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

  The contact portion K between the two 28A and 52A serves as a switching portion that restrains the rotation or freely rotates depending on whether or not the two 28A and 52A are in contact with each other. The rotation is restricted in the contact state, and the rotation is free in the non-contact state. That is, since the piston member 52 is integrally formed with the non-rotating cylinder auxiliary member 42 by the connecting member 60, the piston member 52 is a relative rotating portion in the rotating state of the rotary table 20. Then, when the contact action force is applied to the contact portion K, the rotation table 20 is prevented from rotating. Therefore, the downward acting force of the piston member 52 acts as an acting force for blocking and restraining the rotation of the turntable 20.

  Further, the downward acting force transmitted to the rotary table 20 is shown by a white arrow on the sliding surface 46 of the support body member 38 formed on the lower right side portion of the table body member 24 as viewed in FIG. The acting force F acts as an acting force that restrains the rotation of the turntable 20. Sliding members 72 and 74 are provided at contact portions M between the sliding surface 46 and the lower surface of the table body member 24, respectively. A first sliding member 72 is arranged on the sliding surface 46, and a second sliding member 74 is arranged 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 such that the contact portion K is larger than the contact portion M. Therefore, the contact portion M is formed by the friction reducing means, and each contact portion K, M is configured as follows. First, in the contact portion K, the main body of the piston member 52 is made of steel. On the other hand, the rotation transmission assisting member 28 having the collar 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 member 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 body member 24 is made of steel. The support 22 as the 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 based on FIG.

  First, in a state in which the rotary table 20 on which the workpiece W is placed is rotated, hydraulic oil is supplied to the lower hydraulic oil chamber 64 below the piston member 52 through the oil passage 70. In this state, the hydraulic fluid in the upper hydraulic fluid chamber 62 above the piston member 52 is discharged through the oil passage 66. The control of supply / discharge 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 which it is not in contact with the rotary table 20. That is, the piston member 52 moves upward due to the upward acting force. This movement is easily performed because the connecting member 60 is bendable in the rotation axis direction. Due to this upward movement, the contact portion K between the piston member 52 and the flange portion 28A of the rotation transmission auxiliary member 28 is in a separated state. As a result, the rotary table 20 is placed on the sliding surface 46 of the support body member 38, but since no downward acting force is exerted on the rotary table 20, the rotary table 20 rotates with respect to the support body 22. It is in a free rotation state with a low friction coefficient that does not restrict the direction.

  In the free rotation 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 rotary power source such as an electric motor (not shown). As a result, the workpiece W placed on the rotary table 20 can have a predetermined phase.

  Then, in the free rotation state of the rotary table 20 described above, the rotary table 20 is rotationally slid on the sliding surface 46 while being 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 rotary table 20 is rotated with high rotation efficiency.

  Next, the operation of blocking the rotation of the turntable 20 and restraining it by the support 22 to hold it will be described. In a state in which the rotary table 20 is held by being held by the support body 22, the working oil is supplied to the upper working 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 operating oil supplied to the upper operating oil chamber 62.

  The downward acting force F generated on the piston member 52 pushes the flange portion 28A of the rotation transmission assisting member 28 downward via the contact portion K. At this time, the rotation transmission auxiliary member 28, that is, the rotation table 20 is prevented from rotating and restrained. That is, at the abutting portion K, the non-rotating piston member 52 makes a rotational sliding contact with the rotating collar portion 28A by the acting force F, so that a frictional force that prevents rotation acts. As a result, rotation of the rotary table 20 is blocked and restrained, and the piston member 52 is gripped by the support 22.

  Particularly, in the present 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 done. 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 grasped.

  Further, the rotation table 20 as a whole is also moved downward by pushing the rotation transmission auxiliary member 28 downward by the contact portion K. By the downward movement of the rotary table 20, the rotation of the rotary table 20 is also prevented at the contact portion M described above. By this action, the turntable 20 is restrained by the support 22 and held. In other words, at the contact portion M, the rotary table 20 in the rotating state makes a rotational sliding contact with the non-rotating support body 22 with the acting force F, and a frictional force that prevents rotation is exerted. As a result, rotation of the rotary table 20 is blocked and restrained, and the piston member 52 is gripped by the support 22.

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

  Although the present invention has been described above with reference to specific embodiments, the present invention can be implemented in various other modes.

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

  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 it is also possible to adopt the opposite arrangement form.

  Further, although the fastening means such as bolts is used as the means for integrating the respective parts in the above-described embodiment, other means such as welding or adhesion may be used.

  Further, in the above-mentioned embodiment, the working pressure for moving the piston member 52 up and down uses the working oil, but it may be air.

10 Machining Center 11 Bed 12 Z-axis Moving Column 13 Y-axis Moving Body 14 Quill Spindle 15 Tool 16 X-axis Moving Table (Support)
18 rotary table device 20 rotary table 22 support 24 table main body member 28 rotation transmission auxiliary member 28A collar 30 cover auxiliary member 38 support main body member 40 rotary base auxiliary member 42 cylinder auxiliary member 43 bearing 46 sliding surface 48 worm gear 50 worm Wheel 52 Piston member 54 Closing plug 60 Connecting member 60A Inner peripheral portion 60B Outer peripheral portion 60C Intermediate portion 60X Thick wall portion 60Y Thin wall portion 62 Upper hydraulic fluid chamber 64 Lower hydraulic fluid chamber 66 Oil passage 70 Oil passage 72 First sliding member 74 Second sliding member B Rotational direction of rotary table C Rotational axis direction of rotary table W Workpiece K Abutment M Abutment S Shot peening

Claims (10)

A support as the base of the device,
With respect to the support, a rotary table disposed so as to be rotatable and slidable on a sliding surface formed on the support,
A piston member arranged 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;
A rotary table device that generates an action force that restrains rotation on the sliding surface between the sliding surface of the support body and the rotary table by the pressure applied to the rotary table by the piston member,
A connecting member for connecting the support member and the piston member,
The connecting member has a structure that is flexible in the rotation axis direction of the rotary table but has rigidity in the rotation direction,
A rotary table device that, when the piston member presses the rotary table, produces an acting force that restrains the rotation of the rotary table even between the pressing portions of the two. The rotary table device according to claim 1,
The connecting member that connects the support member and the piston member has a thin-walled portion between the connecting portion with the piston member and the connecting portion with the support member for facilitating bending in the rotation axis direction of the rotary table. Having a rotary table device. The rotary table device according to claim 2,
The rotary table device, wherein the thin portion of the connecting member has a shape that does not interfere with the support when the connecting member bends. The rotary table device according to claim 3,
The rotary table device is configured such that the thin portion of the connecting member does not interfere with the support when it is bent by the thin portion, and the thin portion of the connecting member is formed in a concave shape in a 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 a fatigue life improving means. The rotary table device according to claim 5,
The rotary table device, wherein the fatigue life improving means is shot peening. The rotary table device according to any one of claims 1 to 6,
A rotary table device, wherein a friction coefficient between the two pressing the rotary table by the piston member is set to be larger than a friction coefficient between a sliding surface formed on the support and a contact surface with the rotary table. The rotary table device according to any one of claims 1 to 7,
A rotary table device, wherein friction reducing means is provided between contact surfaces of a sliding surface formed on the support and the rotary table. The rotary table device according to claim 8,
The rotary table device in which the friction reducing means on the sliding surface formed on the support is a sliding member made of an oil-impregnated resin.   A machine tool comprising the rotary table device according to claim 1.

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