Tool Holder with Cooling Effect
The tool holder with an internal cooling system addresses the limited cooling of conventional machine tools by providing direct coolant supply to tools, enhancing cooling and reducing thermal deformation, thus extending tool life.
Patent Information
- Application Number
- JP2025001852U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2035-06-06
AI Technical Summary
Conventional machine tools with rotary turrets have limited cooling effectiveness due to coolant nozzles that only cool a part of the tool in contact with the workpiece, and are prone to coolant blockage by machining chips.
A tool holder with an internal cooling system that includes a holder base, shank, and internal coolant passages to supply coolant directly to the tool, enhancing cooling and lubrication, and incorporating seals and nozzles for efficient coolant distribution.
Improves cooling and reduces thermal deformation of tools, extending tool life by ensuring comprehensive tool cooling and effective chip removal.
Smart Images
Figure 0003252280000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a tool turret of a machine tool, and more particularly to a tool holder having a cooling effect for mounting a tool on the tool turret.
Background Art
[0002] To accommodate different machining methods, a machine tool has a plurality of tool holders for mounting tools. Conventional machine tools have a rotary turret and a plurality of tool holders arranged on the outer periphery of the tool turret for mounting different tool holders and tools. When the tool turret rotates, different tools rotate at that position to machine the workpiece.
[0003] In conventional machine tools, the cooling system usually arranges coolant nozzles around the tool holder or the rotary turret to discharge coolant towards the machining position between the tool and the workpiece. However, cooling by the coolant nozzles can only cool a part of the tool in contact with the workpiece, and the coolant may be blocked by the chips generated during machining. Therefore, the cooling effect is limited.
[0004] To overcome the above-mentioned drawbacks of conventional machine tools equipped with a rotary turret, the present invention provides a tool holder having a cooling effect for reducing or eliminating the above-mentioned problems.
Summary of the Invention
[0005] The main object of the present invention is to provide a tool holder having a cooling effect capable of cooling a tool and a tool holder through an internal cooling technique.
[0006] The tool holder having a cooling effect has a holder base and a shank. The holder base has a main body and a base passage extending inward from the outer surface of the main body to the inside of the main body. The shank is attached to the holder base and has a receiving groove and a shank passage. The receiving groove is configured to receive a tool assembly. The shank passage forms a part of the shank within the holder base, extends from the outer surface of the shank to the receiving groove, and communicates the base passage of the holder base with the receiving groove.
[0007] Other objects, advantages, and novel features of the present invention will become more apparent from the following detailed description and the accompanying drawings.
Brief Description of the Drawings
[0008]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
[0009] The present invention provides a tool holder having a cooling effect, configured to be disposed on a rotary turret of a computer numerical control (CNC) lathe. By providing a plurality of tool holders, different types of tools and corresponding tool handles can be annularly arranged on the outer periphery of the rotary turret. In this way, the rotary turret can rotate different tools to face the workpiece according to different machining processes. Referring to FIG. 1, the tool holder has a holder base 10 and a shank 20 attached to the holder base 10.
[0010] Referring to FIGS. 1, 2 and 4, the holder base 10 has a main body 30 and a base passage 31. The main body 30 has a plurality of connection holes through which a plurality of bolts are respectively passed to fix the main body 30 to the rotary turret. The main body 30 has a cavity structure in which the shank 20, bearings and other components can be arranged. The base passage 31 extends inside the main body 30 from the outer surface of the main body 30 to the inside of the main body 30. Referring to FIG. 2, the base passage 31 forms an inlet 311 on the outer surface of the main body 30. The inlet 311 is configured to be connected to a coolant source through a pipe, whereby coolant is supplied into the main body 30 through the base passage 31.
[0011] Referring to FIGS. 2 and 4, the shank 20 is rotatably attached to the main body 30 of the holder base 10. The shank 20 and the main body 30 are spaced apart from each other through a plurality of bearings disposed therebetween, whereby the shank 20 is held on the axis of the holder base 10. The shank 20 has a receiving groove 21 and a shank passage 22. The receiving groove 21 extends from one end of the shank 20 towards the other end of the shank 20 to receive the tool handle therein. In a preferred embodiment, the inner contour of the receiving groove 21 is conical, and the inner diameter of the receiving groove 21 is tapered from one end of the shank 20 towards the other end of the shank 20. This makes it possible to reliably match the receiving groove 21 with a conical tool handle.
[0012] Referring to FIGS. 2 to 5, the shank passage 22 is formed in a part of the shank 20 within the holder base 10, extends inside the shank 20 from the outer surface of the shank 20 to the accommodation groove 21, and communicates the accommodation groove 21 with the base passage 31 of the holder base 10. Thereby, after the coolant enters from the inlet 311 of the base passage 31, it flows into the shank passage 22 and then into the accommodation groove 21, and cools the tool handle received in the accommodation groove 21 and the tool attached to the tool handle.
[0013] Specifically, referring to FIG. 6, when a tool is attached to the tool holder, the accommodation groove 21 receives the tool handle 91 of the tool assembly 90. Since the internal contour of the accommodation groove 21 is conical, when the fixing cover 93 is screwed onto the shank 20, the tool handle 91 is positioned and fixed within the accommodation groove 21. When machining is performed with the tool 92 of the tool assembly attached to the tool handle 91, the coolant enters from the inlet 311, passes through the base passage 31 and the shank passage 22, and enters the accommodation groove 21. By attaching the tool assembly 90 to the internal coolant passage, the coolant flows through the tool handle 91 and further the tool 92 for cooling, and is discharged near the machining position, resulting in better cooling, lubrication, and chip removal effects.
[0014] The base passage 31 of the holder base 10 and the shank passage 22 of the shank 20 form a supply path for the coolant to the tool assembly 90 mounted thereon. In this way, since the tool holder aligns the tool assembly 90 with the internal coolant passage, it becomes possible to cool the tool handle 91, the tool 92, and the machining position by the internal cooling technique. Compared with a conventional machine tool equipped with a rotary turret that employs a coolant nozzle independent of the tool holder, the present invention improves the cooling effect on the tool 92 and reduces the thermal deformation of the tool 92, so the life of the tool 92 mounted on the rotary turret is extended.
[0015] Referring to FIGS. 2 to 5, in a preferred embodiment, the holder base 10 specifically has a sheath 40, an outer ring 50, and an inner ring 60. The sheath 40, the outer ring 50, and the inner ring 60 are disposed between the main body 30 of the holder base 10 and the shank 20, and form a passage communicating the base passage 31 and the shank passage 22.
[0016] Referring to FIGS. 3 to 5, the sheath 40 abuts against the inner surface of the main body 30 of the holder base 10 and surrounds the shank 20. The sheath 40 has a plurality of through holes 41 extending along different radial directions of the shank 20. Thereby, the coolant passes through the inside of the sheath 40 and flows from the different through holes 41 along different radial directions. Specifically, referring to FIG. 5, an annular gap G1 is formed between and surrounded by the main body 30 of the holder base 10 and the sheath 40. The base passage 31 extends to the inner surface of the main body 30 and the annular gap G1, whereby the annular gap G1 communicates the base passage 31 and the plurality of through holes 41.
[0017] Referring to FIGS. 3 to 5, the outer ring 50 and the inner ring 60 are disposed between the sheath 40 and the shank 20. The inner ring 60 fits into the shank 20, the outer ring 50 fits into the inner ring 60 and abuts against the inner peripheral surface of the sheath 40. The outer ring 50 has a plurality of penetrating outer coolant holes 51, and the inner ring 60 has a plurality of penetrating inner coolant holes 61. The plurality of outer coolant holes 51 and the plurality of inner coolant holes 61 are defined along different radial directions of the shank 20, respectively. For this reason, the coolant passes through the inside of the plurality of outer coolant holes 51 and the plurality of inner coolant holes 61 along different radial directions, and finally flows into the shank passage 22 of the shank 20.
[0018] Specifically, referring to FIG. 5, an annular outer coolant gap G2 is formed by the outer ring 50 and the sheath 40, and the gap G2 communicates a plurality of outer coolant holes 51 and a plurality of through holes 41. An annular intermediate coolant gap G3 is formed by the outer ring 50 and the inner ring 60, and the gap G3 communicates a plurality of outer coolant holes 51 and a plurality of inner coolant holes 61. An annular inner coolant gap G4 is formed by the inner ring 60 and the shank 20, and the gap G4 communicates a plurality of inner coolant holes 61 and the shank passage 22 of the shank 20.
[0019] In a preferred embodiment, since each of the above gaps is annular, even if the inlets of the plurality of through holes 41, the plurality of outer coolant holes 51, the plurality of inner coolant holes 61, and the shank passage 22 face different directions, the coolant still flows through the inside of the shank passage 22 and the accommodation groove 21 and is supplied to the internal cooling passage of the tool assembly 90. Therefore, the assembly of the sheath 40, the outer ring 50, and the inner ring 60 can be simplified. Further, due to these gaps, the coolant can keep the sheath 40, the outer ring 50, and the inner ring 60 in a low-temperature state, thereby preventing the inside of the main body 30 from overheating due to the friction when the shank 20 rotates inside the main body 30.
[0020] Furthermore, referring to FIG. 3, the outer ring 50 is composed of two ring components 52 connected to each other, and each ring component 52 has a plurality of concave notches 521. When the two ring components 52 are symmetrically connected to each other, the plurality of notches 521 of one of the two ring components 52 are connected to the corresponding notches 521 of the other ring component 52, and the outer coolant holes 51 are formed. When the outer ring 50 has a thickness (the difference between the outer diameter and the inner diameter), since the resistance of the workpiece during the process is small, it is easier to form the notches 521 in the ring component 52 to form the outer coolant holes 51 than to directly process the outer ring 50 to form the outer coolant holes 51. Thereby, the accuracy of the outer ring 50 and the outer coolant holes 51 becomes higher.
[0021] Furthermore, in a preferred embodiment, the holder base 10 has a plurality of O-rings. The plurality of O-rings are respectively disposed between the body 30 of the holder base 10 and the sheath 40, between the sheath 40 and the outer ring 50, between the outer ring 50 and the inner ring 60, and between the inner ring 60 and the shank 20. At least one of the plurality of O-rings disposed between two adjacent ones of these components is provided between them. Thereby, when the coolant flows inwards, leakage is prevented, and all of it is supplied to the internal coolant passage of the tool assembly 90 via the above-described path.
[0022] Referring to FIGS. 2 and 4, the tool holder preferably has a seal screw 70 selectively disposed in the shank passage 22. Specifically, the shank passage 22 has a plurality of radial portions 221 and a shaft portion 222 along the axis of the shank 20. The plurality of radial portions 221 each extend inside the shank 20 from the outer surface of the shank 20 along different radial directions of the shank 20 to the shaft portion 222. The shaft portion 222 extends along the axial direction of the shank 20 to the receiving groove 21, in which an internal thread is formed. The seal screw 70 can be selectively screwed into the shaft portion 222.
[0023] When the above-described internal coolant system is not used, if the seal screw 70 is screwed into the shaft portion 222 from the opening of the receiving groove 21, leakage of the coolant can be prevented. When the internal coolant system is used, the seal screw 70 may be loosened from the shaft portion 222 and removed from the opening of the receiving groove 21. Thereafter, if the tool assembly 90 is mounted in the receiving groove 21, the coolant is supplied to the internal coolant passage of the tool assembly 90 via the base passage 31, the passage in the holder base 10, and the shank passage 22.
[0024] Furthermore, referring to FIGS. 2, 4, and 6, in a preferred embodiment, the tool holder includes a coolant nozzle 80. The coolant nozzle 80 is disposed on the main body 30 of the holder base 10 and has a nozzle passage 81. One end of the nozzle passage 81 communicates with and is connected to the base passage 31, and an outlet 82 is formed at the other end of the nozzle passage 81. After the coolant flows into the base passage 31 from the inlet 311, it branches at the branch of the base passage 31. A part of the coolant flows into the internal coolant passage of the tool assembly through the passage between the main body 30 and the shank 20, and the remaining part of the coolant enters the nozzle passage 81 and is discharged from the outlet 82 to the tool 92. Therefore, the tool 92 is cooled by the coolant from both the internal coolant passage and the coolant nozzle 80.
[0025] Specifically, the coolant nozzle 80 has a spherical structure rotatably disposed in the concave groove of the main body 30. By the bolt fixed to the main body 30 abutting against the spherical structure, it is prevented that the coolant nozzle 80 comes off from the groove of the main body 30. Therefore, the coolant nozzle 80 can appropriately discharge the coolant to the spot to be cooled by adjusting the angle as needed. More preferably, referring to FIGS. 2 and 4, the coolant nozzle 80 has a nozzle screw 83 selectively screwed to the outlet 82 of the nozzle passage 81. In this way, the tool holder can be used to cool one or both of the internal coolant passage and the coolant nozzle 80.
[0026] Referring to FIG. 7, a preferred embodiment of the tool holder according to the present invention can also mount another tool assembly 90A. Referring to FIG. 6, in the tool assembly 90, the tool 92 is an elongated six-flute end mill, and the tool handle 91 has an elongated hole extending axially for mounting the tool 92. The internal coolant passage is formed by the tool handle 91 and the tool 92 being penetrated. Referring to FIG. 7, the tool assembly 90A has two tools 92A, and each of the two tools 92A is a lathe tool. The tool handle 91A is a lathe tool holder and has two recesses for mounting the two tools 92A respectively. The internal coolant passage is formed in the tool handle 91A and has openings facing the two tools 92A respectively.
[0027] Furthermore, the tool holder of the present invention is not only configured to be able to mount only the tool assembly including the tool handle and the tool as described above, but is also configured to be able to mount a tool assembly further including a collet and a collet nut. The configuration of the tool assembly mounted on the tool holder can be varied according to the type of the tool and the method of fixing the tool, and is not limited to the tool assemblies 90 and 90a in FIGS. 6 and 7.
[0028] Although many features and advantages of the present invention have been described in detail together with the structure and features of the present invention, this disclosure is only an example. Within the scope of the spirit of the present invention, detailed changes, particularly with respect to the shape, size, and arrangement of parts, can be made to the maximum extent shown by the broad general meaning of the terms expressed in the appended utility model registration claims.
Claims
1. A tool holder having a cooling effect, comprising: a main body; a base passage extending inward from the outer surface of the main body to the inside of the main body; a holder base having the same; a receiving groove for receiving a tool assembly; a shank passage extending from the outer surface of the shank to the receiving groove, communicating the base passage of the holder base with the receiving groove, and formed in a part of the shank within the holder base; a shank mounted on the holder base and having the same; a tool holder comprising the above.
2. The holder base is: a sheath that abuts against the inner surface of the main body and surrounds the shank, and has at least one through hole that enables a coolant to flow from the base passage to the shank passage. The tool holder according to Claim 1.
3. Surrounded by the sheath and the holder base, an annular gap is formed therebetween, The annular gap communicates the base passage of the holder base with the at least one through hole of the sheath. The tool holder according to Claim 2.
4. The holder base is: an inner ring that fits into the shank and has at least one penetrating inner coolant hole; an outer ring that fits into the inner ring, abuts against the inner circumferential surface of the sheath, and has at least one penetrating outer coolant hole; having the same, The at least one inner coolant hole and the at least one outer coolant hole allow the coolant to flow through the at least one through hole of the sheath into the shank passage of the shank. The tool holder according to Claim 2.
5. Surrounded by the outer ring and the sheath, an annular outer coolant gap is formed therebetween, The outer coolant gap communicates the at least one through hole of the sheath with the at least one outer coolant hole of the outer ring. The tool holder according to Claim 4.
6. Surrounded by the outer ring and the inner ring, an annular intermediate coolant gap is formed therebetween, The intermediate coolant gap communicates the at least one outer coolant hole of the outer ring with the at least one inner coolant hole of the inner ring. The tool holder according to Claim 4.
7. Surrounded by the inner ring and the shank, an annular inner coolant gap is formed therebetween, The inner coolant gap communicates the at least one inner coolant hole of the inner ring with the shank passage of the shank. The tool holder according to claim 4.
8. The outer ring has two ring components each having at least one concave notch. The two ring components of the outer ring are connected to each other such that the notches of the two ring components are connected to form the at least one outer coolant hole. The tool holder according to claim 4.
9. The shank passage has at least one radial portion extending radially inward from the outer surface of the shank, and an axial portion extending axially from the at least one radial portion to the receiving groove. The tool holder includes a seal screw selectively attached to the axial portion via a female screw. The tool holder according to any one of claims 1 to 8.
10. The tool holder has a nozzle passage having one end of both ends connected to and communicating with the base passage of the holder base, and the other end of both ends forming an outlet configured to discharge coolant toward the tool assembly, and is provided with a coolant nozzle connected to the main body of the holder base. The tool holder according to any one of claims 1 to 8.