JP2004249456A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly perform rotational driving by improving rotational accuracy of a tool post and a rotary table. <P>SOLUTION: The tool post is installed in a shaft part 4, and is rotatably supported, and a tool is supported by the tool post. At least a part of the shaft part 4 is housed in a support case 5, and a magnet 6 is installed on an outer peripheral surface of the shaft part 4. A core 7 is oppositely installed to the magnet 6 inside the support case 5, and a coil 8 is wound on the core 7, and is constituted so as to rotate the tool post by using force generated between the core 7 and the magnet 6 by supplying electric power to the coil 8. Rotation of the rotary table is preferably similarly constituted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

    The present invention relates to a machine tool provided with at least one of a tool rest for supporting a tool and work holding means for holding a work.

    Conventionally, for example, in a machine tool such as a CNC lathe, a tool rest is configured to be rotationally driven by a motor.

    FIG. 6 is an external perspective view showing an example of the structure of a conventional machine tool. The illustrated machine tool includes a chuck 100A for holding a workpiece W and a tailstock shaft (also referred to as a “center”) 100B. The work W can be rotated around the axis CT1. A headstock (tool post) 102 that supports the tool 101 is disposed between the chuck 100A and the tailstock shaft 100B (for example, see Patent Document 1). The headstock 102 is rotatably supported around the axis CT2 by a headstock support 103, and is rotated to a predetermined position by a motor (not shown) housed inside the tool rest main body 104. Is configured. Reference numeral 105 denotes a guide device for guiding the tool rest main body 104 in the X direction, and reference numeral 106 denotes a guide device for guiding the guide device 105 in the Z direction.

FIG. 7 is a partial cross-sectional view showing the internal structure of the machine tool shown in FIG. 6, but the driving force for rotating the headstock 102 around the axis CT2 is transmitted via gears 110 and 111. To be transmitted.
JP-A-10-328905

    By the way, in the machine tool as described above, the head stock 102 is configured to be rotationally driven via the gears 110 and 111 and there is a backlash, so that the positioning accuracy of the tool 101 is deteriorated. was there.

    Further, due to the backlash, a time lag occurs between the start and stop of the movement of the tool 101, and there is a problem that the rotational drive cannot be performed smoothly.

    According to a first aspect of the present invention, there is provided a tool rest (2) for supporting at least one tool (1), and work holding means (3A, 3B) for holding a work (W). In the machine tool for processing the work (W) in 1), the tool rest (2) has a shaft (4) attached and is rotatably supported, and at least a part of the shaft (4) is A plurality of magnets (6) are housed in a support case (5), and a plurality of magnets (6) are attached to an outer peripheral surface of the shaft portion (4) along a circumferential direction. A plurality of cores (7) are attached so as to face the core, and a coil (8) is wound around each of the cores (7), and the coil (8) is energized so that the core (7) and the magnet (6) Using the force generated between the tool post (2) and the tool post (2) to a predetermined position Let rolling, characterized in that.

    According to a second aspect of the present invention, in the first aspect, the cooling air is supplied to the core (7), the coil (8), the magnet (6), and the like in the support case by the blowing means (F). , Is characterized.

In a third aspect of the present invention, in the second aspect, a first passage (D ₁ ) disposed in the support case (5) and opened to the outside of the case (5) is substantially provided. said support casing (5) a second passageway disposed within so that the sealed state and (D _2), the core with communicates with the first passageway (D ₁₎ and said second passage (D ₂₎ (7), a third passage (D ₃ ) arranged so as to pass near the coil (8), the magnet (6), and the like, and the second passage is provided by the blowing means (F). By setting the inside of (D ₂ ) to a high pressure, the air in the second passage (D ₂ ) flows through the third passage (D ₃ ) and the first passage (D ₁ ). It is characterized by the following.

In a fourth aspect of the present invention, in the second aspect, the first passage (D ₁ ) disposed so as to penetrate the support case (5) and the first passage (D ₁ ) penetrates the support case (5). The second passage (D ₂ ) is arranged so as to communicate with the first passage (D ₁ ) and the second passage (D ₂ ) and the core (7), the coil (8), and the second passage (D ₂ ). And a third passage (D ₃ ) disposed so as to pass in the vicinity of the magnet (6) and the like, and by blowing air through the first passage (D ₁ ) by the blowing means (F), the air outside the support case (5) is to flow in the second passage (D ₂₎ and the first passage through the third passage (D ₃₎ (D _1), and characterized in that I do.

    According to a fifth aspect of the present invention, a tool provided with at least one of a tool rest (2) for supporting a tool (1) and work holding means (3A, 3B, 23) for holding a work (W). In the machine, at least one of the tool rest (2) and the work holding means (3A, 3B, 23) has a shaft (4, 24) attached and is rotatably supported. ) Are housed in a support case (5, 25), and a plurality of magnets (6, 26) are attached to the outer peripheral surface of the shaft portion (4, 24) along the circumferential direction. A plurality of cores (7, 27) are mounted inside the (5, 25) so as to face the magnets (6, 26), and the coils (8, 28) are respectively mounted on the cores (7, 27). By winding the coil (8, 28) Rotating the tool rest (2) or the work holding means (3A, 3B, 23) using a force generated between the core (7, 27) and the magnet (6, 26). Features.

In the sixth aspect of the present invention, the core (7, 27), the coil (8, 28) and the magnet (6, 26) in the support case (5, 25) are blown by the blowing means (F, F ₀ ). ) Is supplied with cooling air.

In the seventh aspect of the present invention, the support case (25) is disposed in the support case (25) and is substantially closed with the first passageway (D ₁₁ ) opened to the outside of the case. 25), a second passage (D ₁₂ ) disposed in the first passage (D ₁₁ ) and the second passage (D ₁₂ ), and the core (27), the coil (28), and the like. A third passage (D ₁₃ ) disposed so as to pass near the magnet (26) and the like, and the inside of the second passage (D ₁₂ ) is made high pressure by the blowing means (F ₀ ). Thereby, the air in the second passage (D ₁₂ ) flows through the third passage (D ₁₃ ) and the first passage (D ₁₁ ).

In the eighth aspect of the present invention, the first passage (D ₁₁ ) disposed to penetrate the support case (25) and the first passage (D ₁₁ ) disposed to penetrate the support case (25). Two passages (D ₁₂ ), the first passages (D ₁₁ ) and the second passages (D ₁₂ ), and near the core (27), the coil (28), the magnet (26), etc. And a third passage (D ₁₃ ) disposed so as to pass therethrough, and by blowing air through the second passage (D ₁₂ ) by the blowing means (F ₀ ), the support case (25) external air is to flow in the first passage _{(D 11)} and the second passage via the third passage _{(D 13) (D 12)} , characterized in that.

    Note that the numbers in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings. The same applies to the following columns of “action” and “effect of the invention”.

    According to the first aspect of the present invention, when the coil (8) is energized, a force is generated between the core (7) and the magnet (6). ) And the tool rest (2) can be rotated.

    Further, in the second aspect of the present invention, the cooling air can be supplied by the blowing means (F).

Still further, according to the third aspect of the present invention, the air in the second passage (D ₂ ) can be caused to flow through the third passage (D ₃ ).

Further, in the fourth invention of the present invention, can supply air outside the support case (5) from the second passage (D ₂₎ in the third passage (D _3).

    In the fifth aspect of the present invention, when the coil (8, 28) is energized, a force is generated between the core (7, 27) and the magnet (6, 26). The tool rest (2) or the work holding means (3A, 3B, 23) can be rotated.

Further, in the sixth aspect of the present invention, the cooling air can be supplied by the blowing means (F, F ₀ ).

In the seventh aspect of the present invention, the air in the second passage (D ₁₂ ) can be caused to flow into the third passage (D ₁₃ ).

Further, according to the eighth aspect of the present invention, the air outside the support case (25) can be supplied from the first passage (D ₁₁ ) to the third passage (D ₁₃ ).

    As described above, according to the first aspect of the present invention, the magnet (6) is attached to the shaft (4) of the tool post (2), and the core (7) is attached to a position facing the magnet (6). The tool post (2) can be rotated to a predetermined rotation position or at a predetermined angular velocity by a force generated between the magnet (6) and the core (7). Since no gear or the like is used, there is no backlash, and the positioning accuracy of the tool (1) can be improved. Further, since there is no backlash, there is no time lag between the start and stop of the movement of the tool (1), and the rotation can be smoothly performed.

    According to a second aspect of the present invention, in the first aspect, the cooling air is supplied to the core (7), the coil (8), the magnet (6), and the like in the support case by the blowing means (F). Therefore, the thermal expansion can be reduced, and the gap between the core (7) and the magnet (6) can be appropriately maintained.

According to a third aspect of the present invention, in the second aspect, the first passage (D ₁ ) disposed in the support case (5) and opened to the outside of the case (5) is substantially sealed. And a second passage (D ₂ ) disposed in the support case (5) so as to communicate with the first passage (D ₁ ) and the second passage (D ₂ ). ), A third passage (D ₃ ) arranged to pass near the coil (8), the magnet (6), and the like, and the second passage (D ₃ ) is provided by the blowing means (F). ₂ ) In order to increase the pressure inside, the cooling air having the same temperature can flow through each of the plurality of third passages (D ₃ ), and the gap between each core (7) and the magnet (6) can be increased. The dimensions can be made uniform.

According to a fourth aspect of the present invention, in the second aspect, a first passage (D ₁ ) disposed so as to penetrate the support case (5) and the first passage (D ₁ ) penetrate the support case (5). The second passage (D ₂ ) disposed in the first passage (D ₁ ) and the second passage (D ₂ ) communicate with the core (7), the coil (8), and the magnet ( 6) etc., and a third passage (D ₃ ) arranged so as to pass in the vicinity, and the air is caused to flow through the first passage (D ₁ ) by the blowing means (F). The cooling air having the same temperature can flow through each of the plurality of third passages (D ₃ ), and the gap size between each core (7) and the magnet (6) can be made uniform. .

    According to a fifth aspect of the present invention, a magnet (6, 26) is attached to the shaft (4, 24) of the tool rest (2) or the work holding means (3A, 3B, 23), and the magnet (6, 26) is attached. A core (7, 27) is mounted at a position facing the magnet (6, 26) and the tool post (2) or the work holding means (3A, 3B, 23) can be rotated to a predetermined rotation position or at a predetermined angular velocity. Since no gear or the like is used, there is no backlash, and the positioning accuracy of the tool (1) and the work (W) can be improved. Further, since there is no backlash, there is no time lag in starting or stopping the movement of the tool (1) or the work (W), and the rotation can be smoothly performed. Further, the size of the apparatus can be reduced as compared with the case where gears or the like are used.

According to a sixth aspect of the present invention, in the fifth aspect, the core (7, 27), the coil (8, 28) or the magnet (6, 26) in the support case is provided by the blowing means (F, F ₀ ). ) And the like, so that the thermal expansion can be reduced, and the gap between the cores (7, 27) and the magnets (6, 26) can be appropriately maintained.

According to a seventh aspect of the present invention, in the sixth aspect, the first passage (D ₁₁ ) disposed in the support case (25) and opened to the outside of the case (25) is substantially sealed. And a second passage (D ₁₂ ) disposed in the support case (25) so as to communicate with the first passage (D ₁₂ ) and the second passage (D ₁₂ ) and the core (27). ), A third passage (D ₁₃ ) disposed so as to pass near the coil (28), the magnet (26), and the like, and the second passage (D ₀ ) is provided by the blowing means (F ₀ ). In order to increase the pressure inside D ₁₂ ), cooling air at the same temperature can be flowed through each of the plurality of third passages (D ₁₃ ), and between each core (27) and the magnet (26). The gap size can be made uniform.

According to an eighth aspect of the present invention, in the sixth aspect, a first passage (D ₁₁ ) disposed so as to penetrate the support case (25) and the first passage (D ₁₁ ) penetrates the support case (25). The second passage (D ₁₂ ) disposed in the first passage (D ₁₁ ) and the second passage (D ₁₂ ) communicate with the core (27), the coil (28), and the magnet ( 26) etc., and a third passage (D ₁₃ ) arranged so as to pass in the vicinity of the second passage (D ₁₂ ) by the blowing means (F ₀ ). Therefore, the cooling air having the same temperature can flow through each of the plurality of third passages (D ₁₃ ), and the gap size between each core (27) and the magnet (26) can be made uniform. it can.

    An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view for explaining the structure of a rotary drive unit of the tool rest 2 (a part for rotatingly driving the shaft 4 of the tool rest 2), and FIG. FIG. 3 is a schematic view showing an example of the structure of a machine tool having the tool rest. FIG. 4 is an end view taken along the line GG of FIG. 3 and is a schematic view for explaining an attached state of a blower (fan). FIG. 5 is a perspective view showing an example of an external appearance of a tool post or the like. FIG.

    As shown in FIGS. 3 and 5, the machine tool according to the present invention includes a tool rest 2 attached to a shaft 4 and supported rotatably about an axis CT3. Supports at least one tool 1. The machine tool is provided with work holding means 3A and 3B for holding the work W, and the work W is machined by the tool 1 held by the tool rest 2 at an appropriate rotational position around the axis CT3. It is configured as follows. Further, at least a part of the shaft portion 4 is housed in a support case 5 as shown in detail in FIG. 1, and a magnet 6 is attached to an outer peripheral surface of the shaft portion 4. Further, a core 7 is mounted inside the support case 5 so as to face the magnet 6, and a coil 8 is wound around the core 7.

    The shaft portion 4 is formed in a substantially cylindrical shape or a substantially cylindrical shape. A plurality of the magnets 6 are arranged along the circumferential direction of the outer peripheral surface of the shaft portion 4, and a plurality of sets of the core 7 and the coils 8 are also arranged.

    By the way, in the machine tool according to the present embodiment, a large torque acts on the shaft portion 4 of the tool post 2, and a considerable amount of heat is generated in its driving portion (the core 7, the coil 8, and the like). It is preferable to arrange a cooling means for cooling. Thereby, the thermal expansion of the core 7 and the coil 8 can be reduced, and the gap between the core 7 and the magnet 6 can be appropriately maintained.

Such cooling means include:
・ Air-cooled type,
・ Water-cooled type,
· Using Peltier elements,
Can be mentioned. Hereinafter, an air-cooling type cooling unit will be described with reference to FIGS. 1 and 4.

For example, as shown in FIG. 4, cooling air may be supplied to the core 7, the coil 8, the magnet 6, and the like (at least one or all) in the support case by the blowing means F. _{It is} preferable to supply the cooling air through the path indicated by ₃ . In addition, the blowing means in this specification is
・ A fan that sends air into the passage,
・ It is a concept that includes both a pump that increases the pressure in the passage.

In order to flow cooling air along the path shown by the arrow D ₃ in FIG. 1, the first passage D _1, a second passage D _2, the core 7 and the conjunction communicates with the passages D _1, D ₂ a third passage D ₃ which is arranged to pass through the vicinity of such a coil 8 and the magnet 6, the previously formed in the support casing 5, the first passage D ₁ of the one is not opened in the case 5 outside , the second passage D ₂ of the other left as an approximately closed state, it is preferable to the second passage D in ₂ to high pressure by the blowing means F. By this, the air in the second passage D ₂ flows through the third passage D ₃ and the first passage D _1.

Alternatively, so as to pass through the first passage D _1, a second passage D _2, in the vicinity of such the core 7 and the coil 8 and the magnet 6 with communicates with the passages D _1, D ₂ in a third passage D ₃ arranged, the previously formed in the support casing 5, any passage of the first passage D ₁ and second passage D ₂ also advance so as to penetrate the support case 5, and a method for flowing air in the first passage D ₁ by the blowing means F. Wherein the flow wind the first passage D _1, the air in the third passage D ₃ in the vicinity of the opening of the third passage D ₃ is a negative pressure is sucked into the first passage D _1, as a result , so that the outside air of the support casing 5 is supplied to the third passage D ₃ via the second passage D _2.

In either case, the first passage D ₁ and second passage D ₂ are so as to pass through the vicinity of each core 7 (e.g., in the direction perpendicular to the paper surface in FIG. 1) are arranged, the third passage D ₃ are each core It is preferable to arrange a plurality of such components (for each core) so as to pass further closer to 7. Well the first passage D ₁ and second passage D ₂ is formed by arranging the rectifying plates 9 and 10, may third passage D ₃ is formed to penetrate the core 7 and a coil 8.

Further, it is preferable in the opening of the first passage D ₁ and second passage D ₂ providing the filter.

Furthermore, the radiator is provided on the first passage D ₁ and second passage D _2, it may be to cool the air supplied to the passage.

    On the other hand, the above-described support case 5 is preferably formed of a non-magnetic material such as aluminum. Thus, generation of unnecessary eddy current and generation of heat can be prevented. In addition, if the support case 5 is cooled by the above-described cooling means, the gap between the core 7 and the magnet 6 can be maintained at an appropriate size.

The machine tool according to the above-described embodiment is
(1) Although both the tool rest 2 for supporting the tool 1 and the work holding means 3A and 3B for holding the work W are provided, the present invention provides a tool having at least one of the tool rest and the work holding means. Applicable to machines, specifically
(2) a machine tool having a tool post but no work holding means,
(3) a machine tool having work holding means but not having a tool post,
Also applicable to

    Further, in the above-described embodiment, the core 7 and the magnet 6 are disposed toward the tool rest 2 to apply the rotational driving force. However, the core and the magnet are disposed only on the work holding units 3A and 3B. Alternatively, a core, a magnet, or the like may be provided on both of the work holding means 3A and 3B and the tool rest 2 to apply the rotational driving force. Furthermore, the rotary driving force may be applied to the tool rest of the machine tool of the above (2) by the same mechanism, or the rotary driving force may be applied to the work holding means of the machine tool of the above (3) by the same mechanism. . That is, the present invention is applicable not only to the rotation of the tool rest but also to the rotation of the work holding means, and at least one of the tool rest and the work holding means is rotatably supported with a shaft attached. At least a part of the shaft portion is housed in a support case, a plurality of magnets are attached to an outer peripheral surface of the shaft portion along a circumferential direction, and a plurality of magnets are provided inside the support case so as to face the magnets. A core is attached, a coil is wound around each core, and the tool post or the work holding means is rotated by utilizing a force generated between the core and the magnet by energizing the coil. It is characterized by the following.

    Hereinafter, an embodiment in which the present invention is applied to a work holding unit will be described with reference to FIGS. Here, FIG. 8 is a cross-sectional view showing an example of the structure of a rotation driving unit (a part for rotating the work holding unit) of the work holding unit, and FIG. 9 is a diagram for cooling the rotation driving unit. It is a figure for explaining a mechanism.

    In FIG. 8, the work holding means 23 has a shaft 24 attached thereto and is rotatably supported. At least a part of the shaft 24 is housed in a support case 25, and the outer circumferential surface of the shaft 24 A plurality of magnets 26 are attached along the direction, and a plurality of cores 27 are attached to the inside of the support case 25 so as to face the magnets 26, and a coil 28 is wound around each core 27, respectively. The work holding means 23 is configured to rotate by using a force generated between the core 27 and the magnet 26 by energizing the coil 28.

    The work holding means 23 in FIG. 8 is a rotary table on which a work is placed and is made of one plate, but has another structure (for example, having a chuck mechanism and making the table itself detachable. Structure).

    Further, the shaft portion 24 is attached to the lower surface of the work holding means 23 with the bolt 32, but may be attached by other means or may be formed integrally with the work holding means 23.

    Further, the illustrated support case 25 is shaped to surround the shaft portion 24 from the side and below, and a substantially cylindrical base 30 is erected on the bottom 25a of the support case 25. 30 is fitted in the internal space of the shaft portion 24 having a substantially cylindrical shape, and a bearing 31 is interposed between the shaft portion 24 of the base 30 and the shaft portion 24 and the work holding means 23. The base 30 is configured to be rotatably supported around the axis CT4. In the illustrated device, the base 30 is formed in a substantially cylindrical shape, and the shaft 24 is formed in a substantially cylindrical shape. However, other configurations (for example, the base 30 is formed in a substantially cylindrical shape, and the shaft 24 is formed in a substantially cylindrical shape). Configuration). Further, in the illustrated apparatus, the work holding means 23 is rotatably supported based on the shaft portion 24 being fitted to the base 30, but may be rotatably supported by another configuration. Good, the presence of the base 30 is not essential.

    By the way, as in the case of the tool post 2 described above, a cooling means for cooling the core 27, the coil 28 and the like may be arranged in the work holding means 23. Thereby, the thermal expansion of the core 27 and the coil 28 can be reduced, and the gap between the core 27 and the magnet 26 can be appropriately maintained. As the cooling means, as described above, an air-cooling method, a water-cooling method, or a method using a Peltier element can be used.

    Hereinafter, an air-cooling type cooling unit will be described with reference to the drawings.

For example, well when adapted to supply cooling air to such a core 27 and coils 28 and the magnet 26 inside the support casing by the blowing means F ₀ as shown in FIGS. 8 and 9 (at least one, or all), therefore In this case, it is preferable to supply cooling air to a passage indicated by reference numeral _D03 in FIGS.

If the passage D ₀₃ flowing cooling air, is arranged a third passage D ₀₃ to pass in the vicinity of such the core 27 and the coil 28 and the magnet 26, both ends of the passage D ₀₃ is in FIG. 9 as shown, the first passage D ₀₁ was opened to the support case 25 _outside, and the support case 25 by respectively communicated with the second passage D ₀₂ which is opened to the outside, blower means F into the opening of the first passage D _{01 0} is arranged so that the wind from the blowing means F ₀ flows in the order of the first passage D ₀₁ → the third passage D ₀₃ → the second passage D ₀₂ .

Further, a passage having the same configuration as that of the above-described embodiment may be formed. That is, as shown in FIG. 10, the first passage D ₁₁ , the second passage D _12, and the vicinity of the core 27, the coil 28, the magnet 26, etc. which are communicated with these passages D ₁₁ and D _12. a third passage D ₁₃ which are arranged to pass through, and the previously formed in the support casing 25, with one of the first passage D ₁₁ causes the opening to the case 25 outside (reference numeral 25b), the other of the first the second passage D ₁₂ leave a substantially closed state, the air blowing means F ₀ may be the second passage D ₁₂ to a high pressure. By this, the air in the second passage _{D 12} flows through the third passage _{D 13} and the first passage _{D 11.}

Alternatively, so as to pass through the first passage _{D 11,} and the second passage _{D 12,} the vicinity of such the core 27 and the coil 28 and the magnet 26 with communicates with the passages _{D 11, D 12} in a third passage D ₁₃ arranged, the previously formed in the support casing 25, any passage of the first passage D ₁₁ and the second passage D ₁₂ also advance so as to penetrate the support case 25, and a method for flowing air in the second passage D ₁₂ by the blowing unit F _0. Flowing the air in the second passage D _12, the air in the third passage D ₁₃ in the vicinity of the opening of the third passage D ₁₃ is a negative pressure is sucked into the second passage D _12, as a result , so that the outside air of the support casing 25 is supplied to the third passage D ₁₃ via the first passage D _11.

In either case, the first passage D ₁₁ and the second passage D ₁₂ is disposed so as to pass through the vicinity of each core 27, such that the third passage D ₁₃ passes through the further vicinity of each core 27 (each core It is good to arrange a plurality of them. Well the first passage _{D 11} and the second passage _{D 12} are formed by placing the rectifying plate 10, may third passage _{D 13} is formed to penetrate the core 27 and coil 28.

Note that a filter or a radiator (see reference numeral 33 in FIGS. 8 and 10) may be appropriately provided in the openings of the passages D ₀₁ , D ₀₂ , D ₁₁ , and D ₁₂ .

    Next, the operation of the present embodiment will be described.

    When the coils 8 and 28 are energized, repulsive and attractive forces are generated between the cores 7 and 27 and the magnets 6 and 26, and the forces cause the shafts 4 and 24, the tool rest 2 or the work holding means 23 to move. Can be rotated. For example, when the tool rest 2 holds a plurality of tools 1,..., The tool rest 2 is rotated to a predetermined position to replace the tools 1,. Processing such as milling can be performed on the work W.

    Next, effects of the present embodiment will be described.

    According to the present embodiment, the magnets 6 and 26 are attached to the shaft portions 4 and 24 of the tool rest 2 and the work holding means 23, and the cores 7 and 27 are attached at positions facing the magnets 6 and 26. , 26 and the cores 7, 27, the tool post 2 and the work holding means 23 can be rotated. Since no gear or the like is used, there is no backlash, and the positioning accuracy and machining accuracy of the tool 1 and the work W can be improved. Further, since there is no backlash, there is no time lag in starting or stopping the movement of the tool 1 or the work W, and the rotation can be smoothly performed. Further, the size of the apparatus can be reduced as compared with the case where gears or the like are used.

Further, when the blowing means F, by F ₀ and to supply the cooling air like the core 7, 27 and coils 8, 28 and magnets 6, 26 in said support case is to reduce the thermal expansion, the core The gaps between the magnets 7 and 27 and the magnets 6 and 26 can be appropriately maintained.

Further, the first passages D ₁ and D ₁₁ , which are disposed in the support cases 5 and 25 and open to the outside of the cases 5 and 25, are disposed in the support cases 5 and 25 so as to be substantially sealed. The second paths D ₂ , D ₁₂ and the first paths D ₁ , D ₁₁ and the second paths D ₂ , D ₁₂ are communicated with the cores 7, 27, the coils 8, 28, and the magnets. And third passages D ₃ and D ₁₃ arranged so as to pass in the vicinity of 6, 26, etc., and the inside of the second passages D ₂ and D ₁₂ is made high pressure by the blowing means F and F ₀ . In this case, cooling air at the same temperature can flow through each of the plurality of third passages D ₃ and D ₁₃ , and the gap size between each of the cores 7 and 27 and the magnets 6 and 26 is made uniform. be able to.

Also, first passages D ₁ , D ₁₁ arranged to penetrate the support cases 5, 25, and second passages D ₂ , D ₁₂ arranged to penetrate the support cases 5, 25, It is connected to the first passages D ₁ , D ₁₁ and the second passages D ₂ , D ₁₂ , and is disposed so as to pass near the cores 7, 27, the coils 8, 28, the magnets 6, 26, and the like. And the third passages D ₃ and D ₁₃ are provided, and when the air is caused to flow through the first passage D ₁ or the second passage D ₁₂ by the blowers F and F ₀ , a plurality of arrangements are provided. Cooling air at the same temperature can flow in each of the third passages D ₃ and D ₁₃ , and the gap size between the cores 7 and 27 and the magnets 6 and 26 can be made uniform.

Sectional drawing for demonstrating the structure of the rotation drive part (a part for rotating the shaft part of a tool post) of a tool post. FIG. 2 is a sectional view taken along line EE of FIG. 1. FIG. 2 is a schematic diagram illustrating an example of a structure of a machine tool. The schematic diagram for demonstrating the attachment state of a blowing means. The perspective view showing an example of the appearance of a tool rest etc. FIG. 4 is an external perspective view illustrating an example of the structure of a conventional machine tool. FIG. 9 is a partial cross-sectional view showing the internal structure of a conventional machine tool. Sectional drawing which shows an example of the structure of the rotation drive part (part for rotating a work holding means) of a work holding means. FIG. 4 is a diagram for explaining a mechanism for cooling a rotation drive unit of a work holding unit. Sectional drawing which shows the other example of the structure of the rotation drive part of a workpiece holding means.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Tool 2 Turret 3A, 3B Work holding means 4 Shaft 5 Support case 6 Magnet 7 Core 8 Coil 23 Work holding means 24 Shaft 25 Support case 26 Magnet 27 Core 28 Coil D ₁ 1st passage D ₂ 2nd passage D ₃ third passage D ₁₁ first passage D ₁₂ second passage D ₁₃ third passage F blowing means F ₀ blowing means W workpiece

Claims (8)

A tool tool that supports at least one tool, and a work holding unit that holds a work, wherein the machine tool processes the work with the tool.
The tool rest is rotatably supported with a shaft attached thereto,
At least a part of the shaft portion is housed in a support case,
A plurality of magnets are attached to the outer peripheral surface of the shaft along the circumferential direction,
Inside the support case, a plurality of cores are attached so as to face the magnet,
A coil is wound around each core,
By rotating the tool post to a predetermined position using a force generated between the core and the magnet by energizing the coil,
A machine tool characterized in that: Supplying cooling air to a core, a coil, a magnet, and the like in the support case by a blowing unit
The machine tool according to claim 1, wherein: A first passage arranged in the support case and opened to the outside of the case, a second passage arranged in the support case so as to be substantially closed, and a first passage and the second passage. And a third passage that is communicated with and disposed near the core, the coil, the magnet, and the like, and
By setting the inside of the second passage to a high pressure by the blowing means, the air in the second passage flows through the third passage and the first passage.
The machine tool according to claim 2, wherein: A first passage arranged to penetrate the support case, a second passage arranged to penetrate the support case, and the first passage and the second passage communicate with the core and the core; A third passage arranged so as to pass near a coil, the magnet, or the like, and
By causing air to flow through the first passage by the blower, air outside the support case flows into the first passage via the second passage and the third passage.
The machine tool according to claim 2, wherein: In a tool post that supports a tool, and a machine tool that includes at least one of a work holding unit that holds a work,
At least one of the tool rest and the work holding means is rotatably supported with a shaft attached thereto,
At least a part of the shaft portion is housed in a support case,
A plurality of magnets are attached to the outer peripheral surface of the shaft along the circumferential direction,
Inside the support case, a plurality of cores are attached so as to face the magnet,
A coil is wound around each core,
Rotating the tool rest or the work holding means using a force generated between the core and the magnet by energizing the coil,
A machine tool characterized in that: Supplying cooling air to a core, a coil, a magnet, and the like in the support case by a blowing unit
The machine tool according to claim 5, wherein: A first passage arranged in the support case and opened to the outside of the case, a second passage arranged in the support case so as to be substantially closed, and a first passage and the second passage. And a third passage that is communicated with and disposed near the core, the coil, the magnet, and the like, and
By setting the inside of the second passage to a high pressure by the blowing means, the air in the second passage flows through the third passage and the first passage.
The machine tool according to claim 6, wherein: A first passage arranged to penetrate the support case, a second passage arranged to penetrate the support case, and the first passage and the second passage communicate with the core and the core; A third passage arranged so as to pass near a coil, the magnet, or the like, and
By causing air to flow through the second passage by the blower, air outside the support case flows into the second passage via the first passage and the third passage.
The machine tool according to claim 6, wherein:

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