Swivel turret

Abstract

The outer cylinder (20) of the turret device (1) has a cylindrical receiving space (24) on the front side, and a coolant discharge passage (22) on the inner circumferential surface (24a) as an opening for a connection port (22a). The connection ports (22a) are formed at predetermined intervals in the circumferential direction. A coolant supply mechanism (25) is disposed in the receiving space (24) at the end of the shaft (10), and the opening of the outer cylinder (20) is closed by a cover (39). The coolant supply mechanism (25) has a retractable rod (30) that moves forward and backward relative to the inner circumferential surface (24a) of the receiving space (24) and a shaft receiving portion (26) that supports the retractable rod (30). The retractable rod (30) has a supply hole (34, 53) that opens at the front end, and has an annular elastic body (50) arranged to surround the opening. As the forward / backward lever (30) moves forward, the elastic body (50) abuts against the connection port (22a) surrounding the inner circumferential surface (24a).

Description

Technical Field

[0001] The present invention relates to a turret assembly installed on a machine tool, and more specifically, to a turret assembly having a coolant supply mechanism. Background Technology

[0002] As a turret device equipped with the aforementioned coolant supply mechanism (coolant supply device), a turret device disclosed in Japanese Patent Application Publication No. 2014-240104 (hereinafter referred to as Patent Document 1) is known in the past. As disclosed in that publication, the turret device is configured as a coolant supply device in such a way that a piston is mounted in a piston holder installed on the tool holder body in a manner that allows it to freely protrude and retract, so that the piston engages with a coolant inlet provided on the back side of the turret, thereby supplying coolant to the tool side.

[0003] Furthermore, the positional relationship between the inlet of the piston holder and the piston is set such that the pressure of the coolant supplied from the tool holder body to the piston holder acts on the rear end face of the piston, and a coolant flow path from the rear end face to the front end face is formed through the center of the piston.

[0004] According to the coolant supply device, the pressure of the coolant supplied to the piston holder acts on the rear end face of the piston, thereby causing the piston to protrude toward the back side of the turret. The piston engages with the front end pressed against the coolant inlet provided on the back side of the turret, and coolant is supplied into the turret through the coolant flow path formed through the piston.

[0005] On the other hand, if the supply of coolant to the piston cage is stopped, the piston will retract due to the force of the compression coil spring located in the piston cage, thereby releasing the engagement between the front end of the piston and the back of the turret, allowing the turret to rotate.

[0006] However, if there is no liquid seal between the piston's front end and the turret's back side, coolant may leak from the gap between them and scatter into inappropriate locations. Additionally, sometimes machining chips generated in the machining area may scatter onto the back side of the turret. If these chips become trapped between the piston's front end and the turret's back side, a gap will form, allowing coolant to leak from this gap.

[0007] Therefore, as disclosed in Japanese Patent Application Publication No. 2017-205861, the following treatment method was used in the past: a sealing ring made of elastic resin was provided at the front end of the piston to liquid-tightly seal the front end of the piston with the back of the turret.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2014-240104

[0011] Patent Document 2: Japanese Patent Application Publication No. 2017-205861 Summary of the Invention

[0012] The technical problem that the invention aims to solve

[0013] However, as mentioned above, sometimes chips generated during processing may fly to the back side of the turret in the processing area. As a result, chips may sometimes get stuck between the sealing ring located at the front end of the piston and the back side of the turret. Although this sticking may not immediately damage the liquid tightness between the front end of the piston and the back side of the turret, if the piston front end and the back side of the turret are repeatedly pressed and separated under such sticking conditions, the sealing ring will gradually be damaged, thereby damaging its sealing performance, and coolant will leak from the damaged part of the sealing ring.

[0014] In addition, if the sealing ring is damaged like this, it needs to be replaced. However, the coolant supply device is located on the back side of the turret, making replacement difficult and causing the machine to be stopped for a long time.

[0015] The present invention was made in view of the above-mentioned actual situation, and its object is to provide a turret device that can prevent foreign objects such as chips from getting into the coolant supply mechanism, and also allows for easy replacement of parts of the coolant supply mechanism.

[0016] Solutions for solving technical problems

[0017] The present invention, which addresses the above-mentioned technical problems, relates to a turret device, the turret device comprising:

[0018] A non-rotating shaft portion having at least one support portion with a cylindrical outer circumferential surface; and

[0019] The outer cylindrical section is composed of hollow, polygonal prisms open at both ends, with at least the outer periphery's planes serving as mounting surfaces for installing tools.

[0020] The outer cylinder portion has at least one supported portion with a cylindrical inner circumferential surface, and the supported portion, when externally fitted into the support portion of the shaft portion inserted from the opening on one side, is supported by the shaft portion to rotate freely.

[0021] The turret assembly is configured to index the mounting surfaces formed on the outer peripheral surface of the outer cylinder to predetermined machining positions.

[0022] The outer cylinder has a cylindrical receiving space on the opening side on the other side, with a coolant discharge path opening as a connection port on the inner circumferential surface. The connection port is formed at predetermined intervals in the circumferential direction corresponding to each mounting surface.

[0023] A coolant supply mechanism is disposed within the receiving space of the outer cylinder portion. This coolant supply mechanism is located at the end of the shaft portion, and the opening on the other side is closed by a cover.

[0024] The coolant supply mechanism includes: a retractable lever disposed along a radial direction and retracting relative to the inner circumferential surface of the receiving space; and a shaft receiving portion that supports the retractable lever to enable it to retract, and has a drive portion for retracting the retractable lever.

[0025] The advance / retractor has a feed hole extending along its axis and opening at its front end, where an annular elastic body is arranged to surround the feed hole.

[0026] As the forward / reverse lever moves forward, the elastic body abuts against the inner peripheral surface of the receiving space in such a way that it surrounds the connection port formed on the inner peripheral surface of the receiving space.

[0027] According to this turret device, by rotating the outer cylinder section using a suitable drive device, each mounting surface formed on the outer circumferential surface of the outer cylinder section can be indexed to a predetermined machining position. Furthermore, when indexing the outer cylinder section, the advance / retreat lever of the coolant supply mechanism is driven backward by the drive unit, and the elastic body provided at the front end of the advance / retreat lever separates from the inner circumferential surface of the receiving space towards the radial center.

[0028] Furthermore, if the advance / retractor is moved forward by the drive unit of the coolant supply mechanism while the predetermined mounting surface on the outer cylinder is indexed to the machining position, the elastic body provided at the front end of the advance / retractor abuts against the inner circumferential surface of the receiving space in such a way that it surrounds the connection port formed on the inner circumferential surface of the receiving space. As a result, the coolant discharge path formed on the outer cylinder communicates with the supply hole formed on the advance / retractor, and coolant is supplied to the coolant discharge path through the supply hole of the advance / retractor.

[0029] In addition, coolant is supplied from a coolant supply source to the supply hole of the advance / retractor rod via a coolant supply flow path, which is formed in the shaft portion and connected to a designated coolant supply source.

[0030] Furthermore, in this turret assembly, the coolant supply mechanism is located on the side of the outer cylinder opposite to the shaft side, specifically within a receiving space on the front surface side of the outer cylinder. The opening of this receiving space (the opening on the other side) is sealed by a cover, thus preventing chips generated in the machining area from entering the receiving space. Consequently, it prevents foreign objects such as chips from getting stuck between the elastic body located at the front end of the advance / retractor and the inner circumferential surface of the receiving space. This prevents coolant from leaking out from the contact area between the elastic body and the inner circumferential surface of the receiving space.

[0031] In addition, the coolant supply mechanism is located within a containment space formed on the front surface side of the outer cylinder, which is the side where the operator usually performs the work. Therefore, if the coolant supply mechanism malfunctions and requires parts replacement or other maintenance, the operation can be easily and quickly performed by removing the cover.

[0032] In this invention, the following method can be adopted: the drive unit includes: a piston externally fitted to the advance / retract rod; and a pressure chamber formed in the shaft receiving portion and into which the piston is inserted. The advance / retract rod is advanced by supplying pressure fluid to the pressure chamber on the rear side in the advance / retract direction of the advance / retract rod, and the advance / retract rod is retracted by supplying pressure fluid to the pressure chamber on the front side.

[0033] Furthermore, in this invention, the following method can be employed: the retractable lever has a stepped portion in the middle, the rear side of the stepped portion having a smaller diameter and the front side having a larger diameter in the retracting direction; the shaft receiving portion has an annular abutment surface, the annular abutment surface being used by the entire surface of the larger diameter portion of the retractable lever to abut when the retractable lever retracts, thereby achieving a seal through cooperation with the larger diameter portion; when the retractable lever advances, the larger diameter portion separates from the annular abutment surface.

[0034] Furthermore, the shaft housing has a coolant supply chamber formed in a predetermined region encompassing the contact surface in the forward and backward direction.

[0035] The advance / retractor has a connection port on its outer peripheral surface, which is located on the rear side of the stepped portion, and communicates with the supply hole.

[0036] The shaft housing has a coolant supply flow path in a coolant supply chamber located on the front side of the contact surface. The coolant supply flow path is formed in the shaft and connected to a designated coolant supply source.

[0037] According to this method of turret device, when the advance / retractor rod advances, the large-diameter portion forming the stepped section separates from the contact surface of the shaft housing portion, creating a gap of a predetermined interval between them. The coolant supply chamber located behind the stepped section and the coolant supply chamber located in front of the stepped section are connected through this gap. Thus, coolant appropriately supplied from the coolant supply source through the coolant supply flow path of the shaft portion to the coolant supply chamber in front of the shaft housing portion flows through the gap into the rear coolant supply chamber, and is supplied from the connection port of the advance / retractor rod through the internal supply hole to the coolant discharge flow path of the outer cylinder portion.

[0038] If the retracting rod retracts, the entire surface of the large-diameter portion forming the stepped section comes into contact with the abutment surface of the shaft receiving section, and a seal is formed through their cooperation. The communication between the coolant supply chamber located behind the stepped section and the coolant supply chamber located in front of the stepped section is cut off. As a result, the supply of coolant to the supply hole of the retracting rod is cut off, and consequently, the supply of coolant to the coolant discharge path of the outer cylinder is also cut off.

[0039] In summary, in this method, the coolant supply path to the coolant discharge path of the outer cylinder can be opened or closed by the forward and backward movement of the lever.

[0040] Furthermore, in this invention, it is preferable that the elastomer is detachably mounted to the front end of the forward / reverse lever via a mounting component. This allows for easy replacement of the elastomer if needed.

[0041] Furthermore, in this invention, it is preferable that the front end face of the elastomer is formed as a convex surface with a predetermined curvature. This improves the tightness of contact between the elastomer and the inner circumferential surface of the receiving space, thereby more effectively preventing coolant leakage between the elastomer and the inner circumferential surface.

[0042] Furthermore, in this invention, it is preferable that the support portion of the shaft and the supported portion of the outer cylinder embedded in the support portion are sealed together in a liquid-tight manner by a sealing member. In this way, even if coolant leaks from the contact portion between the elastomer and the inner circumferential surface of the receiving space, the sealing member can prevent the coolant from entering other structures provided on the shaft.

[0043] Invention Effects

[0044] As described above, in the turret device according to the present invention, the coolant supply mechanism is disposed within a receiving space provided on the front surface side of the outer cylinder, and this receiving space is sealed by a cover. This prevents chips generated in the processing area from entering the receiving space, and consequently prevents foreign objects such as chips from getting stuck between the elastic body provided at the front end of the advance / retractor and the inner circumferential surface of the receiving space. Thus, coolant leakage from the contact portion between the elastic body and the inner circumferential surface of the receiving space is prevented.

[0045] In addition, the coolant supply mechanism is located in the containment space, which is formed on the front surface side of the outer cylinder, i.e. the side where the operator usually performs the work. Therefore, if the coolant supply mechanism malfunctions and requires parts replacement or other maintenance, the operation can be easily and quickly performed by removing the cover that encloses the containment space. Attached Figure Description

[0046] Figure 1 This is a perspective view of a turret device according to an embodiment of the present invention.

[0047] Figure 2 yes Figure 1 The cross-sectional view in the direction of arrow AA.

[0048] Figure 3 yes Figure 2 The cross-sectional view in the direction of arrow BB.

[0049] Figure 4 This is an explanatory diagram illustrating the operation of the forward / reverse lever involved in this embodiment. It is equivalent to... Figure 2 An explanatory diagram showing a partially enlarged view of the front end area of ​​the forward / reverse lever.

[0050] Figure 5 yes Figure 3 The cross-sectional view with the arrow CC pointing in the middle. Detailed Implementation

[0051] Hereinafter, the turret device according to a specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0052] In this example, the turret device 1 is installed on an NC lathe, such as... Figures 1-3 As shown, it is composed of a base 2, a shaft 10 provided on the base 2, an outer cylinder 20 supported by the shaft 10 and rotatable, a coolant supply mechanism 25 provided in the outer cylinder 20, and a drive motor 3 for rotating the outer cylinder 20.

[0053] The base 2 is composed of a roughly frame-shaped component, which is supported by a suitable support platform (not shown) such as a tool holder when upright. Furthermore, the shaft 10 is mounted on one end face (front face) of the base 2 in a non-rotating state, and the drive motor 3 is mounted on the upper part of the other end face (back face) of the base 2. The rotational power of the drive motor 3 is transmitted to the outer cylinder 20 via an internal power transmission mechanism, thereby allowing the outer cylinder 20 to rotate around its axis center and index to an appropriate angular position.

[0054] The shaft portion 10 is cylindrical in shape, and at least one outer peripheral surface functions as a support portion 11 that supports the outer cylindrical portion 20 to rotate freely. In addition, a coolant supply flow path 12 connected to a predetermined coolant supply source (not shown) is formed inside the shaft portion 10.

[0055] The outer cylindrical portion 20 is constructed of a hollow polygonal prism with openings at both ends, and has at least one supported portion 21 with a cylindrical inner circumferential surface. This supported portion 21 is supported by the shaft portion 10 and can rotate freely when it is externally fitted into the support portion 11 of the shaft portion 10, which is inserted from an opening on one side (rear side). Furthermore, the supported portion 21 and the support portion 11 are sealed by two annular sealing members 14 and 15.

[0056] Furthermore, each plane on the outer periphery of the outer cylinder 20 serves as a mounting surface 21 for mounting tools. By rotating the outer cylinder 20 using the drive motor 3, each mounting surface 21 is indexed to a machining position. In this example, the outer periphery of the outer cylinder 20 is used as the mounting surface 21, but it is not limited to this; the front end surface of the outer cylinder 20 can also be used as the mounting surface.

[0057] Furthermore, the outer cylinder 20 has a receiving space 24 on its open side (front side). The inner circumferential surface 24a of this receiving space 24 is cylindrical, and the diameter of this receiving space 24 is larger than that of the supporting portion 11 and the supported portion 21. Additionally, a coolant discharge path 22, serving as an opening for a connection port 22a, is provided on this inner circumferential surface 24a. Furthermore, multiple connection ports 22a are formed at predetermined intervals in the circumferential direction, corresponding to each mounting surface 21, and the coolant discharge paths 22 are formed corresponding to each connection port 22a. The other end of each coolant discharge path 22 is connected to a discharge portion 22b provided on the front end face of the outer cylinder 20, for example, from a discharge nozzle provided on the discharge portion 22, through which coolant is discharged.

[0058] Furthermore, a coolant supply mechanism 25 is disposed within the receiving space 24 of the outer cylinder portion 20, located at the front end of the shaft portion 10, and the opening on the other side (front side) is closed by the cover 39. In this example, the front end of the shaft portion 10 is located within the receiving space 24, and the coolant supply mechanism 25 is formed at this front end. However, this is not a limitation; the coolant supply mechanism 25 can also be constructed as a different structure from the shaft portion 10, and mounted on the front end face of the shaft portion 10.

[0059] The coolant supply mechanism 25 is composed of a shaft receiving part 26 and a forward / reverse rod 30, etc. The shaft receiving part 26 is composed of a cylindrical receiving hole formed in the radial direction at the front end of the shaft part 10 located in the receiving space 24. The forward / reverse rod 30 is received in the shaft receiving part 26 and moves forward and backward relative to the inner circumferential surface 24a of the receiving space 24 in the direction of arrow DE.

[0060] The retractable lever 30 has a supply hole 34 that passes through its axis and opens at its front end. The retractable lever 30 also has a stepped portion 31 in its middle section, with a smaller diameter (smaller diameter portion 33) on the rear side (arrow E direction) and a larger diameter (larger diameter portion 32) on the front side (arrow D direction) in the retracting direction (arrow DE direction). The shaft receiving portion 26 has an annular abutment surface 27, which allows the entire surface of the larger diameter portion 32 to abut against the retractable lever 30 when it retracts in the arrow E direction, thus achieving a seal through cooperation with the larger diameter portion 32 (see reference). Figure 2 and Figure 3 When the forward / reverse lever 30 moves in the direction of arrow D, it becomes separated from the large-diameter section 32 (see reference). Figure 4 ).

[0061] Additionally, the shaft housing 26 includes a coolant supply chamber 40, which is formed in a predetermined region in the forward and backward direction including the abutment surface 27. The forward and backward lever 30 has a connection port 35 communicating with the supply hole 34 on its outer peripheral surface, which is located further back than the stepped portion 31. The shaft housing 26 has a first coolant supply chamber 41 in the coolant supply chamber 40, which is located forward of the abutment surface 27, with a coolant supply flow path 12 (opening 13). This coolant supply flow path 12 is formed in the shaft portion 10 and connected to a predetermined coolant supply source. The connection port 35 of the forward and backward lever 30 is located in a second coolant supply chamber 42, which is located further back than the abutment surface 27.

[0062] Furthermore, the shaft housing 26 includes a drive unit 45 for advancing and retracting the retractable lever 30. This drive unit 45 comprises a pressure chamber 47 formed in the advancing / retracting direction further rearward than the second coolant supply chamber 42, and a piston 46 inserted into the pressure chamber 47 when externally fitted to the retractable lever 30. Pressure oil is selectively supplied to a pressure chamber (front pressure chamber) 48 located forward of the piston 46 (in the direction of arrow D) and a pressure chamber (rear pressure chamber) located rearward (in the direction of arrow D) via a pressure oil supply passage (not shown) formed in the shaft 10 and connected to a predetermined pressure oil supply source. Thus, if pressure oil is supplied to the front pressure chamber 48, the retractable lever 30 retracts rearward; if pressure oil is supplied to the rear pressure chamber 49, the retractable lever 30 advances forward.

[0063] Furthermore, a narrowed portion 37 with a smaller diameter than the portions before and after it is formed at the front end of the retractable lever 30, and a fitting hole 36 is formed on the front end face of the retractable lever 30, with the supply hole 34 opening at the bottom surface of the fitting hole 36. A retaining member 51 is mounted at the front end of the retractable lever 30 via a mounting plate 55, mounting bolts 56, and a nut 57. This retaining member 51 holds a resilient, cylindrical, and annular sealing body 50.

[0064] The retaining member 51 has a fitting protrusion 52 that engages with the fitting hole 36. With the fitting protrusion 52 engaged with the fitting hole 36, the retaining member 51 is mounted to the front end of the advance / retractor 30 in a liquid-tight state via an O-ring 38. Furthermore, the retaining member 51 has a through-hole 53 communicating with the supply hole 34, and the supply hole 53 opens at the front end face of the retaining member 51. An annular groove is formed on the front end face of the retaining member 51 to surround the opening of the supply hole 53. The sealing body 50 is inserted into this groove and fixed to the retaining member 51 by a mounting bolt 54 threaded from the side of the retaining member 51. Additionally, the front end face of the sealing body 50 is formed as a convex surface with a predetermined curvature.

[0065] In this way, if the retractable lever 30 moves in the direction of arrow D while the outer cylinder 20 is properly indexed, the sealing body 50 provided at the front end of the retractable lever 30 abuts against the inner circumferential surface 24a in a manner that surrounds the connection port 22a formed in the inner circumferential surface 24a of the receiving space 24.

[0066] like Figure 5 As shown, the mounting plate 55 has a U-shaped notch 55a through which the narrowing part 37 is inserted. When the narrowing part 37 is inserted into the notch 55a, the mounting bolt 56 is inserted from the side of the retaining member 51. The nut 57 is threadedly connected to the mounting bolt 56 and tightened. The retaining member 51 is connected to the front end of the advance / retractor 30 in a liquid-tight state.

[0067] Furthermore, the threaded connection of the mounting bolt 56 and nut 57 is set to be greater than the engagement amount between the engagement hole 36 of the retractable lever 30 and the engagement protrusion 52 of the retaining member 51. After loosening the threaded connection of the mounting bolt 56 and nut 57 beyond the engagement amount between the engagement hole 36 and the engagement protrusion 52, the retaining member 51 is moved forward, thereby releasing the engagement between the engagement hole 36 and the engagement protrusion 52. Then, the assembly consisting of the retaining member 51, the sealing body 50, the mounting bolt 54, the mounting plate 55, the mounting bolt 56, and the nut 57 can be detached from the retractable lever in a radial direction opposite to the opening side of the notch 55a formed in the mounting plate 55. Furthermore, by performing the reverse operation, the assembly can be installed onto the retractable lever 30.

[0068] According to the turret device 1 of this example with the above structure, the outer cylinder 20 is rotated by the drive motor 3, and each mounting surface 21 formed on the outer peripheral surface of the outer cylinder 20 is indexed to a predetermined machining position. At this time, the advance / retreat lever 30 of the coolant supply mechanism 25 retracts backward, and the sealing body 50 provided at the front end of the advance / retreat lever 30 separates from the inner peripheral surface 24a of the receiving space 24 toward the radial center side.

[0069] Furthermore, if pressurized oil is supplied to the rear pressure chamber 49 of the coolant supply mechanism 25 while the predetermined mounting surface 21 of the outer cylinder 20 is indexed to the machining position, the retractable lever 30 is propelled forward by the pressurized oil in the direction of arrow D, and the sealing body 50 located at the front end of the retractable lever 30 abuts against the inner circumferential surface 24a of the receiving space 24 in a manner that surrounds the connection port 2a formed in the inner circumferential surface 24a of the receiving space 24 (see reference). Figure 4 ).

[0070] Furthermore, simultaneously, as the retractable lever 30 advances, the large-diameter portion 32 of the stepped portion 31 leaves the abutment surface 27 of the shaft receiving portion 26, forming a predetermined gap between them. The second coolant supply chamber 42, located rearward of the stepped portion 31, and the first coolant supply chamber 41, located forward of the stepped portion 31, are connected through this gap. Thus, coolant supplied from a suitable coolant supply source via the coolant supply flow path 12 of the shaft portion 10 to the first coolant supply chamber 41 of the shaft receiving portion 26 flows into the second coolant supply chamber 42 through the gap. Coolant from the connection port 35 of the retractable lever 30, via the internal supply hole 34 and the supply hole 53 of the retaining member 51, is supplied from the connection port 2a to the corresponding coolant discharge flow path 22 (see reference). Figure 4 ).

[0071] If pressurized oil is supplied to the front pressure chamber 48 of the coolant supply mechanism 25, the retracting lever 30 is forced backward by the pressurized oil in the direction of arrow E, and the sealing body 50 at the front end of the retracting lever 30 releases its contact with the inner circumferential surface 24a of the receiving space 24, separating from the inner circumferential surface 24a towards the radial center (see reference). Figure 2 and Figure 3 ).

[0072] Furthermore, simultaneously, as the retracting lever 30 retracts, the entire surface of the large-diameter portion 32 forming the stepped portion 31 comes into contact with the contact surface 27 of the shaft receiving portion 26. Through their cooperation, the communication between the second coolant supply chamber 42, which is located behind the stepped portion 31, and the first coolant supply chamber 41, which is located in front of the stepped portion 31, is severed. As a result, the supply of coolant to the supply hole 34 of the retracting lever 30 is cut off, and consequently, the supply of coolant to the coolant discharge path 22 of the outer cylinder portion 20 is also cut off (see reference). Figure 2and Figure 3 ).

[0073] In this example, the coolant supply path to the coolant discharge path 22 supplied to the outer cylinder 20 is opened and closed by the forward and backward movement of the forward and backward lever 30.

[0074] Furthermore, in this turret device 1, the coolant supply mechanism 25 is disposed within a receiving space 24 located on the front surface side of the outer cylinder portion 20, and the opening of this receiving space 24 is sealed by a cover 39. This prevents chips generated in the processing area from entering the receiving space 24. Consequently, it prevents foreign objects such as chips from getting stuck between the sealing body 50 located at the front end of the forward / reverse lever 30 and the inner peripheral surface 24a of the receiving space 24. Thus, it prevents coolant from leaking out from the contact portion between the sealing body 50 and the inner peripheral surface 24a of the receiving space 24.

[0075] In addition, the coolant supply mechanism 25 is disposed in the receiving space 24, which is formed on the front surface side of the outer cylinder 30, i.e. the side where the operator usually performs operations. Therefore, if the coolant supply mechanism 25 malfunctions and requires parts replacement or other maintenance, the operation can be easily and quickly performed by removing the cover 39.

[0076] In addition, in this example, the assembly consisting of retaining component 51, sealing body 50, mounting bolt 54, mounting plate 55, mounting bolt 56 and nut 57 is configured to be able to be attached to and detached from the front end of the forward / reverse lever 30. Therefore, even if the sealing body 50 is replaced, the machine tool can be replaced without disconnecting the power supply, thus making the replacement operation easy.

[0077] In addition, in this example, since the front end face of the sealing body 50 is formed as a convex surface with a specified curvature, the tightness of the seal when the sealing body 50 comes into contact with the inner peripheral surface 24a of the receiving space 24 can be improved, thereby more effectively preventing coolant from leaking out between the sealing body 50 and the inner peripheral surface 24a.

[0078] In addition, in this example, the support portion 11 of the shaft portion 10 and the supported portion 21 of the outer cylinder portion 20 embedded in the support portion 11 are sealed in a liquid-tight manner by the seals 14 and 15. Therefore, even if the coolant leaks from the contact portion between the seal 50 and the inner peripheral surface 24a of the receiving space 24, it can prevent the coolant from entering other structures provided in the shaft portion 10.

[0079] Specific embodiments of the present invention have been described above; however, all aspects described in the above embodiments are illustrative and not restrictive. Modifications and alterations can be made appropriately by those skilled in the art. The scope of the invention is shown by the claims rather than by the above embodiments. Furthermore, the scope of the invention includes modifications based on embodiments equivalent to the claims.

[0080] Symbol Explanation

[0081] 1. Turret assembly, 10. Shaft section, 12. Coolant supply flow path, 20. Outer cylinder section, 22. Mounting surface, 23. Coolant discharge flow path, 24. Receiving space, 24a. Inner circumferential surface, 25. Coolant supply mechanism, 26. Shaft receiving section, 30. Advance / retract rod, 31. Stepped section, 34. Supply hole, 35. Connection port, 37. Narrowing section, 39. Cover, 40. Coolant supply chamber, 45. Drive section, 46. Piston, 47. Pressure chamber, 50. Sealing body, 51. Holding component, 55. Mounting plate.

Claims

1. A turret device comprising: A non-rotating shaft portion having at least one support portion with a cylindrical outer circumferential surface; and The outer cylindrical section is composed of hollow, polygonal prisms open at both ends, with at least the outer periphery's planes serving as mounting surfaces for installing tools. The outer cylinder portion has at least one supported portion with a cylindrical inner circumferential surface, and the supported portion, when externally fitted into the support portion of the shaft portion inserted from the opening on one side, is supported by the shaft portion to rotate freely. The turret device is configured to index each of the mounting surfaces formed on the outer peripheral surface of the outer cylinder to a predetermined machining position, characterized in that... The outer cylinder has a cylindrical receiving space on the opening side on the other side, with a coolant discharge path opening as a connection port on the inner circumferential surface. The connection port is formed at predetermined intervals in the circumferential direction corresponding to each of the mounting surfaces. A coolant supply mechanism is disposed within the receiving space of the outer cylinder portion. This coolant supply mechanism is located at the end of the shaft portion, and the opening on the other side is closed by a cover. The coolant supply mechanism includes: a retractable lever disposed along a radial direction and retracting relative to the inner circumferential surface of the receiving space; and a shaft receiving portion that supports the retractable lever to enable it to retract, and has a drive portion for retracting the retractable lever. The advance / retractor has a feed hole extending along its axis and opening at its front end, where an annular elastomer is arranged to surround the feed hole. As the forward / reverse lever moves forward, the elastic body abuts against the inner peripheral surface of the receiving space in such a way that it surrounds the connection port formed on the inner peripheral surface of the receiving space.

2. The turret device according to claim 1, characterized in that, The drive unit includes: a piston externally fitted to the retractable rod; and a pressure chamber formed in the shaft receiving portion and into which the piston is inserted. The retractable rod is advanced by supplying pressure fluid to the pressure chamber on the rear side in the retractable direction, and the retractable rod is retracted by supplying pressure fluid to the pressure chamber on the front side.

3. The turret device according to claim 1, characterized in that, The retractable lever has a stepped portion in the middle. The stepped portion has a smaller diameter on the rear side and a larger diameter on the front side in the retracting direction. The shaft receiving portion has an annular abutment surface. When the retractable lever retracts, the annular abutment surface is used to abut the entire surface of the larger diameter portion of the lever, thus achieving a seal through cooperation with the larger diameter portion. When the retractable lever advances, the larger diameter portion separates from the annular abutment surface. Furthermore, the shaft housing has a coolant supply chamber formed in a predetermined region encompassing the contact surface in the forward and backward direction. The advance / retractor has a connection port on its outer peripheral surface, which is located on the rear side of the stepped portion, and communicates with the supply hole. The shaft housing has a coolant supply flow path in a coolant supply chamber located on the front side of the contact surface. The coolant supply flow path is formed in the shaft and connected to a designated coolant supply source.

4. The turret device according to claim 2, characterized in that, The retractable lever has a stepped portion in the middle. The stepped portion has a smaller diameter on the rear side and a larger diameter on the front side in the retracting direction. The shaft receiving portion has an annular abutment surface. When the retractable lever retracts, the annular abutment surface is used to abut the entire surface of the larger diameter portion of the lever, thus achieving a seal through cooperation with the larger diameter portion. When the retractable lever advances, the larger diameter portion separates from the annular abutment surface. Furthermore, the shaft housing has a coolant supply chamber formed in a predetermined region encompassing the contact surface in the forward and backward direction. The advance / retractor has a connection port on its outer peripheral surface, which is located on the rear side of the stepped portion, and communicates with the supply hole. The shaft housing has a coolant supply flow path in a coolant supply chamber located on the front side of the contact surface. The coolant supply flow path is formed in the shaft and connected to a designated coolant supply source.

5. The turret device according to claim 1, characterized in that, The elastomer is mounted to the front end of the advance / retreat lever in a detachable manner via a mounting component.

6. The turret device according to claim 2, characterized in that, The elastomer is mounted to the front end of the advance / retreat lever in a detachable manner via a mounting component.

7. The turret device according to claim 3, characterized in that, The elastomer is mounted to the front end of the advance / retreat lever in a detachable manner via a mounting component.

8. The turret device according to claim 4, characterized in that, The elastomer is mounted to the front end of the advance / retreat lever in a detachable manner via a mounting component.

9. The turret device according to claim 1, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

10. The turret device according to claim 2, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

11. The turret device according to claim 3, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

12. The turret device according to claim 4, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

13. The turret device according to claim 5, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

14. The turret device according to claim 6, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

15. The turret device according to claim 7, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

16. The turret device according to claim 8, characterized in that, The front end face of the elastomer is formed as a convex surface with a specified curvature.

17. The turret device according to any one of claims 1 to 16, characterized in that, The support portion of the shaft and the supported portion of the outer cylinder that is embedded in the support portion are sealed together by a sealing component to form a liquid-tight seal.

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