A nozzle for providing a flow of coolant fluid to a cutting edge of a metal cutting tool and a metal cutting tool

Abstract

A nozzle (10) for providing a coolant fluid to a cutting edge of a metal cutting tool (1) and such a metal cutting tool (1), wherein the nozzle (10) comprises: - at least one internal inlet coolant channel (16 1i ; 16 2i ), - at least one internal outlet coolant channel (17 1i ; 17 2i ), wherein - the at least one internal inlet coolant channel (16 1i ; 16 2i ) is connected to a coolant inlet (18), and - the at least one internal outlet coolant channel (17 1i ; 17 2i ) is connected to a coolant outlet (19 1i ; 19 2i ) for guiding the coolant fluid to the cutting edge, wherein the nozzle (10) further comprises - a plenum (201; 202) comprising - at least one inlet opening (21 1i ; 21 2i ) connecting the at least one internal inlet coolant channel (16 1i ; 16 2i ) and the plenum (201; 202), and - at least one outlet opening (22 1i ; 22 2i ) connecting the at least one internal outlet channel (17 1i ; 17 2i ) and the plenum (201; 202), wherein - each of the at least one inlet opening (21 1i ; 21 2i ) has a cross-sectional area Ai, and - each of the at least one outlet opening (22 1i ; 22 2i ) has a cross-sectional area A2 I , wherein - wherein i is an integer, n is the number of inlet openings, and m is the number of outlet openings.

Description

Technical Field

[0001] The present invention relates to a nozzle for supplying coolant fluid to the cutting edge of a metal cutting tool and to such a metal cutting tool. Background Technology

[0002] In some metal cutting applications, very high temperatures are generated, which leads to high thermal loads on the cutting tools, resulting in reduced tool life.

[0003] To reduce temperature and thus increase tool life, coolant fluid can be delivered as close to the cutting edge as possible. Many cooling systems are available on the market today, where coolant fluid is supplied under high pressure through the tool holder and coolant nozzles, such as EP3167985A1.

[0004] However, in some applications, one problem with existing systems is that their ability to reduce the thermal load on the cutting edge and thus increase the life of the cutting tool is not satisfactory. Summary of the Invention

[0005] The object of the present invention is to overcome, or at least partially overcome, the aforementioned problem by introducing a nozzle for supplying coolant fluid to the cutting edge of a metal cutting tool and such a metal cutting tool, wherein the coolant effect is increased.

[0006] The object of this invention is achieved by a nozzle that provides coolant fluid to the cutting edge of a metal cutting tool, wherein the nozzle includes...

[0007] - At least one internal inlet coolant passage

[0008] - At least one internal outlet coolant passage, in which

[0009] -The at least one internal inlet coolant passage is connected to the coolant inlet, and

[0010] - The at least one internal outlet coolant passage is connected to a coolant outlet for guiding coolant fluid to the cutting edge, characterized in that the nozzle further comprises:

[0011] -Pressure chamber, including:

[0012] - At least one inlet opening, the at least one inlet opening connecting the at least one internal inlet coolant passage and the pressurization chamber, and

[0013] - At least one outlet opening, the at least one outlet opening connecting the at least one internal outlet passage and the pressurization chamber, wherein

[0014] - Each of the at least one inlet opening has a cross-sectional area A1 i,and

[0015] - Each of the at least one outlet opening has a cross-sectional area A2 i ,in

[0016] -

[0017] Where i is an integer, n is the number of inlet openings, and m is the number of outlet openings.

[0018] By introducing a pressure chamber into the nozzle, where the total cross-sectional area of ​​the inlet opening is larger than that of the outlet opening, this pressure chamber is filled with coolant fluid. This increases the fluid pressure in the subsequent internal outlet channel and thus also increases the fluid pressure at the coolant outlet. By supplying the cutting edge with coolant fluid at increased pressure, the chip-breaking properties of the coolant fluid are improved, which helps reduce friction between the chips and the tool, and thus reduces the thermal load on the tool.

[0019] The term "nozzle" refers to a unit, preferably a detachable unit, for delivering coolant fluid to the cutting edge, preferably as close as possible to the cutting edge. For example, a nozzle can be implemented in the form of a clamp or an inducer.

[0020] The term "coolant fluid" refers to a fluid, either in liquid or gas form, used to improve cutting conditions and also increase tool life. This type of fluid is also commonly referred to as "coolant," "cutting fluid," "cutting oil," or "lubricating fluid."

[0021] A pressurization chamber is an internal volume of any geometry that can be filled with coolant fluid to establish a fluid pressure, and is referred to as a “chamber,” “cavity,” “container,” or “storage unit.”

[0022] The inlet opening can have any geometry and is suitable for connecting the inlet passage to the pressurization chamber.

[0023] The outlet opening can have any geometry and is suitable for connecting the outlet channel to the pressurization chamber.

[0024] According to at least one embodiment, the cross-sectional area represents the area perpendicular to the flow direction measured at the inner walls of the inlet and outlet openings.

[0025] According to one embodiment, the at least one outlet opening is located entirely in plane P, and the coolant outlet is located in plane Q, wherein plane P is parallel to plane Q. By making the outlet opening parallel to the coolant outlet, the outlet coolant channel will have minimal impact on the ejected coolant fluid, which will help maintain the high pressure of the coolant fluid at the coolant outlet.

[0026] According to another embodiment, plane Q and plane P are arranged at an acute angle to each other. By having this type of orientation, the direction of the ejected coolant fluid can be optimally arranged.

[0027] According to one embodiment, the at least one internal coolant outlet channel is linear and has a constant cross-sectional area A2. i By making the linear outlet coolant channel have a constant cross-sectional area corresponding to the cross-sectional area of ​​the corresponding outlet opening, the outlet coolant channel will have a minimal impact on the ejected coolant fluid, which will help maintain the high pressure of the coolant fluid at the coolant outlet.

[0028] According to another embodiment, the at least one outlet coolant passage is tapered, meaning that the diameter of the at least one outlet coolant passage decreases as it extends from the pressurization chamber to the coolant outlet. This tapered outlet coolant passage allows for further increases in fluid pressure within the outlet coolant passage.

[0029] According to one embodiment, the at least one internal outlet coolant channel has a length L out Where 0.5mm≤L out ≤2.0mm. A shorter outlet coolant channel will reduce the channel's impact on pressure. In some applications, channels longer than 2.0mm will have too much of an impact on coolant pressure and are therefore undesirable. In some applications, a shorter outlet channel less than 0.5mm will negatively affect the strength of the outermost portion of the nozzle and is therefore undesirable.

[0030] According to one embodiment, the relationship between the total inlet opening cross-sectional area and the total outlet opening cross-sectional area is as follows:

[0031]

[0032] A high ratio between the total inlet opening cross-sectional area and the total outlet opening cross-sectional area will increase the amount of fluid in the pressurization chamber, and therefore also increase the fluid pressure in the outlet coolant passage. In some applications, a ratio below 1.3 will not result in a preferred increase in fluid pressure. In some applications, a ratio above 56.3 will negatively impact the strength of the pressurization chamber due to a lack of solid material.

[0033] According to one embodiment, 1.5mm 2 ≤A1 i ≤15.0mm 2 In some applications, the cross-sectional area is less than 1.5 mm². 2The aforementioned at least one inlet opening will result in insufficient coolant fluid being supplied to the cutting edge to achieve the desired coolant effect, because the corresponding outlet opening becomes too small due to the need to maintain the ratios discussed above. In some applications, the large cross-sectional area of ​​the at least one inlet opening will negatively impact the strength of the pressurization chamber due to the lack of solid material.

[0034] According to one embodiment, the pressurization chamber has an internal volume V, wherein 40 mm² 3 ≤V≤420mm 3 In some applications, less than 40mm 3 The internal volume will not be sufficient to generate the amount of fluid pressure required to achieve optimal coolant performance. In some applications, due to the lack of solid materials, volumes above 420 mm² are insufficient. 3 The internal volume will have a negative impact on the strength of the nozzle.

[0035] According to one embodiment, the nozzle includes at least two internal outlet coolant channels. By having multiple outlet coolant channels, coolant fluid can be supplied to a larger portion of the cutting edge.

[0036] According to one embodiment, the nozzle includes at least two pressurization chambers, wherein each pressurization chamber includes...

[0037] - At least one inlet opening connecting the pressurization chamber to at least one internal inlet coolant passage, and

[0038] - At least one outlet opening that connects the pressurization chamber to at least one internal outlet coolant passage.

[0039] By having multiple pressurization chambers, the ejected coolant fluid can be controlled to different pressures at different parts of the cutting edge, thus creating a more adaptable cooling system.

[0040] The objective of this invention is further achieved through a metal cutting tool, which includes...

[0041] - Tool holder body,

[0042] - Cutting insert, which is mounted in the tool holder body, and

[0043] - The nozzle described above is attached to the tool holder body.

[0044] Metal cutting tools are preferably turning tools, but can also be any other type of metal cutting tool, such as milling cutters.

[0045] Depending on the application, the cutting inserts can be cubic boron nitride cutting inserts, carbide cutting inserts, cermet cutting inserts, or ceramic cutting inserts.

[0046] According to one embodiment, the nozzle is a detachable nozzle attached to the tool holder body. With a detachable nozzle attached to the tool, the nozzle can be easily replaced when necessary.

[0047] According to one embodiment, the nozzle is a clamp that presses against a portion of the cutting insert. This nozzle achieves the goal of reducing the number of parts in the tool because a separate clamp is not required to hold the insert within the tool holder body. Attached Figure Description

[0048] Figure 1 This is a perspective view of a metal cutting tool according to an embodiment of the present invention.

[0049] Figure 2 This is a side view of the nozzle according to the first embodiment of the present invention.

[0050] Figure 3A This is a front view of the nozzle according to the first embodiment of the present invention.

[0051] Figure 3B This is a front view of the nozzle according to the second embodiment of the present invention.

[0052] Figure 4A This is a top view of the nozzle according to the first embodiment of the present invention.

[0053] Figure 4B This is a top view of the nozzle according to the second embodiment of the present invention.

[0054] Figure 4C This is a top view of the nozzle according to a third embodiment of the present invention.

[0055] Figure 4D This is a top view of the nozzle according to the fourth embodiment of the present invention.

[0056] Figure 5 Is it like this? Figure 4B The diagram shown is a schematic diagram of a pressurization chamber in a nozzle according to a second embodiment of the present invention. Detailed Implementation

[0057] The disclosed embodiments will now be described more fully below with reference to the accompanying drawings, in which specific embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that the disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Similar reference numerals refer to similar elements throughout. Elements shown in the drawings are not necessarily to scale. Some elements may have been enlarged for clarity.

[0058] Figure 1 A metal cutting tool (1) according to an embodiment of the present invention is shown. The metal cutting tool (1) includes a tool holder body (2), a cutting insert (5) mounted in the tool holder body (2), and a nozzle (10) for supplying coolant fluid to the cutting edge of the metal cutting tool (1). The metal cutting tool (1) according to this embodiment is a turning tool.

[0059] Figure 2 A side view of a nozzle (10) according to a first embodiment of the present invention is shown. The nozzle (10) includes an internal inlet coolant passage (16) connected to a coolant inlet (18). 11 ), and having a length L out Internal outlet coolant passage (17) 11 ), the internal outlet coolant passage (17 11 ) Connect to the coolant outlet (19 11 The nozzle (10) is used to spray coolant fluid toward the cutting edge of a metal cutting tool. The nozzle (10) further includes a connection to an internal inlet coolant passage (16). 11 ) and internal outlet coolant passage (17 11 The pressurization chamber (201) of the coolant outlet passage (17) is also included. 11 ) is connected to the pressurization chamber (201) in plane Q and the coolant outlet (19) 11 The plane Q lies in plane P. In the illustrated embodiment, plane Q is parallel to plane P.

[0060] Figure 3A A front view of a nozzle (10) according to a first embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes a coolant outlet (19). 11 ( ), used to spray coolant fluid toward the cutting edge of a metal cutting tool.

[0061] Figure 4A A top view of a nozzle (10) according to a first embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes an internal inlet coolant passage (16) connected to a coolant inlet (18). 11 ) and a pressurization chamber (201). The nozzle (10) further includes an internal outlet coolant passage (17) 11 ), the internal outlet coolant passage (17 11 ) Connect to the coolant outlet (19 11 The nozzle (10) further includes a hole (15) for a fastening element, such as a screw, for securing the nozzle (10) to the tool holder body (2).

[0062] In the following text, alternative embodiments will be described, focusing on different features.

[0063] Figure 3B A front view of a nozzle (10) according to a second embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes two coolant outlets (19). 11 ;19 12 ( ), used to spray coolant fluid toward the cutting edge of a metal cutting tool.

[0064] Figure 4B A top view of a nozzle (10) according to a second embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes two internal inlet coolant channels (16) connected to a coolant inlet (18). 11 ;16 12 ) and a pressurization chamber (201). The nozzle (10) further includes two internal outlet coolant passages (17) 11 ;17 12 ), the two internal outlet coolant passages (17 11 ;17 12 ) Connected to two coolant outlets (19 11 ;19 12 The nozzle (10) further includes a hole (15) for a fastening element, such as a screw, for securing the nozzle (10) to the tool holder body (2).

[0065] Figure 5 The pressurization chamber (201) of the second embodiment is schematically shown. The pressurization chamber (201) has an internal volume V and includes a first inlet opening (21) having a cross-sectional area A11. 11 ) and a second inlet opening (21) with a cross-sectional area A12. 12 The pressurization chamber (201) further includes a first outlet opening (22) having a cross-sectional area A21. 11 ) and a second outlet opening (22) with a cross-sectional area A22. 12 ).

[0066] exist Figure 5 In the middle, the pressurization chamber (201) is shown as a rectangular block, and the inlet opening (21) 11 ;twenty one 12 ) and outlet opening (22 11 ;twenty two 12 The opening is circular. However, in other embodiments, other geometries may be provided, such as, for example, a spherical pressurization chamber with a square inlet opening and a triangular outlet opening.

[0067] Figure 4CA top view of a nozzle (10) according to a third embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes an internal inlet coolant passage (16) connected to a coolant inlet (18). 11 ) and a pressurization chamber (201). The nozzle (10) further includes two internal outlet coolant passages (17) 11 ;17 12 ), the two internal outlet coolant passages (17 11 ;17 12 ) Connected to two coolant outlets (19 11 ;19 12 The nozzle (10) further includes a hole (15) for a fastening element, such as a screw, for securing the nozzle (10) to the tool holder body (2).

[0068] Figure 4D A top view of a nozzle (10) according to a fourth embodiment of the present invention is shown. In this embodiment, the nozzle (10) includes a first internal inlet coolant passage (16). 11 ), the first internal inlet coolant passage (16 11 The nozzle (10) is connected to the coolant inlet (18) and the first pressurization chamber (201). The nozzle (10) further includes a second internal inlet coolant passage (16). 21 The second internal inlet coolant passage (16) 21 It is connected to the coolant inlet (18) and the second pressurization chamber (202). Further, the nozzle (10) includes a first internal outlet coolant passage (17). 11 ), the first internal outlet coolant passage (17 11 ) Connect coolant outlet (19 11 ) and the first pressurization chamber (201), and the second internal outlet coolant passage (17) 21 The second internal outlet coolant passage (17) 21 ) Connect to the coolant outlet (19 21 The nozzle (10) further includes a hole (15) for a fastening element, such as a screw, for securing the nozzle (10) to the tool holder body (2).

[0069] In the second and fourth embodiments shown, the two internal inlet coolant channels (16) 11 ;16 12 ;16 21 They are connected to the same coolant inlet (18). However, they can also be connected to different coolant inlets.

Claims

1. A nozzle (10) for supplying coolant fluid to the cutting edge of a metal cutting tool (1), wherein, The nozzle (10) includes -First internal inlet coolant passage (16) 11 ) and the second internal inlet coolant passage (16 12 ),and -First internal outlet coolant passage (17) 11 ) and the second internal outlet coolant passage (17 12 ),in - First internal inlet coolant passage (16) 11 ) and the second internal inlet coolant passage (16 12 ) is connected to the coolant inlet (18), and -First internal outlet coolant passage (17) 11 ) connected to the first coolant outlet (19 11 ), for guiding the coolant fluid to the cutting edge, and the second internal outlet coolant passage (17) 12 ) connected to the second coolant outlet (19 12 The nozzle (10) is used to guide the coolant fluid to the cutting edge, wherein the nozzle (10) further includes an orifice (15) for receiving a fastening element. The nozzle (10) is characterized in that it further comprises: - A pressurization chamber (201), the pressurization chamber (201) comprising: -First entrance opening (21) 11 ) and second inlet opening (21 12 ), the first inlet opening (21) 11 ) connects to the first internal inlet coolant channel (16) 11 ) and the pressurization chamber (201), the second inlet opening (21) 12 ) connects to the second internal inlet coolant passage (16) 12 ) and the pressurization chamber (201), and -First exit opening (22) 11 ) and second outlet opening (22 12 ), the first outlet opening (22) 11 ) connects to the first internal outlet coolant channel (17) 11 ) and the pressurization chamber (201), the second outlet opening (22) 12 ) connects to the second internal outlet coolant channel (17) 12 ) and the pressurization chamber (201), wherein The first inlet opening (21) 11 ) has a cross-sectional area A11, and the second inlet opening (21) 12 ) has a cross-sectional area of ​​A12, and in which The first outlet opening (22) 11 ) has a cross-sectional area A21, and the second outlet opening (22) 12 ) has a cross-sectional area of ​​A22, where (A11+A12)>(A21+A22), wherein the first inlet opening (21) 11 ) and second inlet opening (21 12 ) is located in the first plane, and wherein the first outlet opening (22) is located in the first plane. 11 ) and second outlet opening (22 12 The first plane is located in the second plane P, wherein the first plane is parallel to the second plane P.

2. The nozzle (10) according to claim 1, wherein, The first coolant outlet (19) 11 ) and the second coolant outlet (19 12 ) lies in plane Q, where The second plane P is parallel to the plane Q.

3. The nozzle (10) according to any one of claims 1-2, wherein -First internal outlet coolant passage (17) 11 ) is linear, has a constant cross-sectional area A21, and wherein, Second internal outlet coolant passage (17) 12 It is linear and has a constant cross-sectional area A22.

4. The nozzle (10) according to any one of claims 1-2, wherein -First internal outlet coolant passage (17) 11 ) and the second internal outlet coolant passage (17) 12 ) has a length L out ,in, 0.5mm≤L out ≤2.0mm。 5. The nozzle (10) according to any one of claims 1-2, wherein 6. The nozzle (10) according to any one of claims 1-2, wherein, 1.5mm 2 ≤Al1,Al2≤15.0mm 2 。 7. The nozzle (10) according to any one of claims 1-2, wherein The pressurization chamber (201) has an internal volume V, wherein, 40mm 3 ≤V≤420mm 3 。 8. A metal cutting tool (1), comprising: - Tool holder body (2); - Cutting blade (5), said cutting blade (5) is mounted in said tool holder body (2); and - The nozzle (10) according to any one of claims 1-7 is attached to the tool holder body (2).

9. The cutting tool according to claim 8, wherein The nozzle (10) is a detachable nozzle attached to the tool holder body (2).

10. The cutting tool according to any one of claims 8 or 9, wherein The nozzle (10) is a clamp that presses against a portion of the cutting blade (5).

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