A new internal cooling taper end mill

Abstract

The utility model provides a novel inner cooling taper end mill, including the cutting tool head and the shank that are connected with each other, the cutting tool head has the taper, and is equipped with a plurality of spiral cutting edges on the cutting tool head, forms the spiral type chip flute between adjacent cutting edges, the cutting edge adopts the spiral angle gradual change structure, and its spiral angle gradually increases from the cutting tool head front end to the shank direction, be equipped with the inner cooling channel in the shank, and the extension path of inner cooling channel whole along the axial distribution of shank, one end of inner cooling channel forms the liquid inlet hole in the terminal end face of shank, and the other end extends to the cutting tool head back, forms the liquid outlet hole in the chip flute of cutting tool head, and the liquid outlet hole is on the extension path of inner cooling channel, the utility model discloses through the collaborative design of taper blade type, variable spiral cutting edge and integral inner cooling channel, realizes the multiple breakthrough of low resistance, high stability, strong shearing force and effective cooling, has greater popularization and application value.

Description

Technical Field

[0001] This utility model relates to the field of milling cutting tools, specifically to a novel internally cooled taper end mill. Background Technology

[0002] End mills are among the most common machining tools. In the cutting of non-ferrous metals and difficult-to-machine materials, effective cooling can mitigate cutting edge failure. With increasingly fierce market competition and a growing variety of products, the demands on internally cooled end mills are also constantly increasing.

[0003] For example, Chinese patent CN119819982A discloses an internal cooling end mill, which includes: a shank, a cutting section, an internal cooling hole, and a side cutting edge water outlet. The cutting section is connected to the shank. The internal cooling hole extends from one end of the shank away from the cutting section toward the interior of the shank and into the interior of the cutting section. The cutting section has an axial end away from the shank. The end of the internal cooling hole located inside the cutting section is not connected to the axial end of the cutting section. The side cutting edge water outlet is disposed on the cutting section. One end of the side cutting edge water outlet communicates with the internal cooling hole, and the other end of the side cutting edge water outlet can discharge water in the direction of the shank.

[0004] However, the aforementioned existing technologies still have some defects. The front and rear diameters of the cutting section are consistent and do not have a taper, which makes the sliding resistance of the rake face large and the shearing force weak during the cutting process, resulting in poor cutting stability and affecting the cutting effect. In addition, the split internal cooling hole and side hole design requires the coolant to be diverted twice, resulting in uneven cooling coverage and insufficient cooling of the cutting edge.

[0005] To address these issues, we propose a novel internally cooled taper end mill to solve the aforementioned technical problems in existing technologies. Utility Model Content

[0006] The purpose of this invention is to provide a novel internally cooled tapered end mill to solve the problems of poor cutting performance and inability to adequately cool the cutting edge in existing technologies.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a novel internally cooled tapered end mill, comprising a cutting head and a shank connected to each other, wherein the cutting head has a taper and is provided with multiple spiral cutting edges, and a spiral chip removal groove is formed between adjacent cutting edges; the cutting edges adopt a gradually changing spiral angle structure, with the spiral angle gradually increasing from the front end of the cutting head to the shank; the shank is provided with an internal cooling channel, the extension path of which is distributed along the axial direction of the shank; one end of the internal cooling channel forms a liquid inlet hole on the end face of the shank, and the other end extends to the cutting head, forming a liquid outlet hole in the chip removal groove of the cutting head, and the liquid outlet hole is on the extension path of the internal cooling channel.

[0008] Furthermore, the taper of the cutting head is in the range of 3°-30°, and the number of cutting edges is set to 2-6.

[0009] Furthermore, the internal cooling channel is provided with two spiral cooling channels, both of which are spiral cooling channels around the axis of the tool holder; the outlets of the two internal cooling channels are respectively formed in two radially opposite chip removal grooves to form liquid outlet holes, and the liquid outlet holes are located on the spiral extension path of the corresponding internal cooling channel.

[0010] Furthermore, the internal cooling channel is provided with two straight cooling channels that extend along the axial direction of the tool holder. The outlets of the two internal cooling channels are respectively formed in two radially opposite chip removal grooves to form liquid outlet holes, and the center of the liquid outlet hole is located on the central axis of the corresponding internal cooling channel.

[0011] Furthermore, the helix angle of the cutting edge varies from 20° to 45°, and the helix angle gradually changes in a continuous linear manner from the front end of the cutting head to the tool holder.

[0012] Furthermore, the width of the chip removal groove gradually increases linearly from the front end of the cutting head to the tool holder.

[0013] Furthermore, the chip removal groove forms a U-shaped arc-shaped smooth transition structure at the end of the tool holder.

[0014] Compared with existing technologies, the above technical solution has the following advantages: 1. The helix angle of the cutting edge changes continuously and linearly from the tip to the tool holder (gradually increasing from small to large), which effectively improves the shearing ability of the cutting edge, while making the force distribution of each section of the cutting edge uniform, effectively suppressing vibration, and making the cutting smoother. 2. The internal cooling channel and the outlet hole are integrally formed in a single machining process and innovatively combined with the tapered cutting edge. During use, the coolant does not need to be redirected twice. Its spray direction is the same as the extension path of the internal cooling channel, ensuring the spray angle and making the coolant spray more evenly. The coolant can effectively form a cooling barrier on the rake face of the tool, improving the cooling effect. 3. The tapered setting of the cutting head optimizes the structure of the chip groove, reduces the resistance of chip sliding on the rake face, and allows the chips to be discharged more smoothly without the risk of retention. At the same time, the stress on the groove wall can be uniformly and gradually changed, which enhances the crack resistance.

[0015] In summary, this technical solution achieves multiple breakthroughs in low resistance, high stability, strong shear force, and effective cooling through the synergistic design of tapered cutting edge, variable spiral cutting edge, and integrated internal cooling channel, and has significant value for widespread application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is the front view of this utility model; Figure 3 It corresponds Figure 2 The right-side view; Figure 4 It corresponds Figure 2 Left side view; Figure 5 This is a schematic diagram of the structure of two straight internal cooling channels 21 in Embodiment 2 of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Cutting head; 11. Cutting edge; 111. Bottom edge; 12. Chip groove; 2. Tool holder; 21. Internal cooling channel; 211. Cooling inlet; 212. Cooling outlet; A. End of cutting head; B. End of tool holder; C. Overall length of end mill; D. Cutting edge length of end mill. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0020] To address the problems existing in the prior art, this utility model provides a novel internal cooling taper end mill, which will be described in detail below with reference to the accompanying drawings. Example

[0021] See Figures 1-4As shown, the technical solution adopted in this specific embodiment is: a novel internally cooled tapered end mill, including a cutting head 1 and a tool holder 2 connected to each other, the cutting head 1 and the tool holder 2 being an integrally formed structure. The cutting head 1 has multiple spiral cutting edges 11, and a spiral chip removal groove 12 is formed between adjacent cutting edges 11. The width of the chip removal groove 12 gradually increases linearly from the front end of the cutting head 1 to the tool holder 2, and the chip removal groove 12 forms a U-shaped arc-shaped smooth transition structure at the end of the tool holder 2. The structural design of the chip removal groove 12 allows chips to be discharged more smoothly without the risk of retention, while the stress on the groove wall can also be uniformly and gradually changed, enhancing crack resistance.

[0022] It should be specifically noted that the cutting edge 11 adopts a gradually increasing helix angle structure, with the helix angle gradually increasing from the front end of the cutting head 1 to the tool holder 2. Specifically, the helix angle of the cutting edge 11 varies from 20° to 45°, and the helix angle changes gradually in a continuous linear manner from the front end of the cutting head 1 to the tool holder 2. The continuous change of the helix angle of the cutting edge 11 can avoid the resonance risk caused by a fixed angle, effectively suppress vibration, and make cutting smoother.

[0023] It should be specifically noted that at least one internal cooling channel 21 is provided inside the tool holder 2, and the extension path of the internal cooling channel 21 is distributed along the axial direction of the tool holder 2. One internal cooling channel 21 forms a liquid inlet hole 211 on the end face of the tool holder 2 away from the cutting head 1 through a single machining operation. After the other end of the internal cooling channel 21 is machined to extend to the cutting head 1, a liquid outlet hole 212 is formed in the chip removal groove 12 of the cutting head 1. It should be emphasized that the liquid outlet hole 212 is formed exactly on the extension path of the internal cooling channel 21.

[0024] Specifically, two internal cooling channels 21 are provided. Both internal cooling channels 21 are spiral cooling channels around the axis of the tool holder 2. The outlets of the two internal cooling channels 21 are respectively formed in two radially opposite chip removal grooves 12 to form liquid outlet holes 212, and the liquid outlet holes 212 are located on the spiral extension path of the corresponding internal cooling channels 21.

[0025] Here, the formation of each coolant outlet 212 is the result of the same machining action as the corresponding internal cooling channel 21. Non-distributed drilling is performed, with the drill bit feeding through the cutting head 1, penetrating the sidewall of the chip removal groove 12, thus forming the coolant outlet 212 on the sidewall of the chip removal groove 12. During the actual use of the end mill, the coolant flows out from the internal cooling channel 21 and is sprayed out through the corresponding coolant outlet 212. The coolant does not undergo secondary diversion, resulting in no flow loss and reaching the end directly without deviation, thus achieving good cooling effect. In specific settings, the diameter of the internal cooling channel 21 is set to 0.5-1.5 mm, and the distance between the two internal cooling channels 21 is set to 3-5 mm.

[0026] It should be specifically noted that the cutting head 1 should have a taper, with the taper angle set between 3° and 30°, and the number of cutting edges 11 set to 2-6. Specifically, the taper setting of the cutting head 1 should match the number of cutting edges 11, ensuring sufficient spacing in the chip removal grooves 12 to allow the fluid outlet holes 212 to form within the grooves without affecting the rigidity of the cutting edges 11 or the tool itself. The taper setting of the cutting head 1 reduces friction on the rake face, and combined with the variable helix angle cutting edges 11, effectively increases the shearing force. Furthermore, the taper of the cutting head 1 optimizes the structure of the chip removal grooves, reducing the resistance to chip sliding on the rake face and allowing for smoother chip removal.

[0027] See Figure 2 As shown, taking a two-flute configuration as an example, the diameter of end A of the cutting head is Φ2.8, and the diameter of end B of the shank is Φ10h6; the total length C of the end mill is 75mm, and the cutting edge length D of the end mill is 29mm; the taper of the cutting head 11 is 7°, the helix angle β1 at the front end of the cutting edge 11 is 25°, and the helix angle β2 at the rear end is 42°. In this case, the diameter of the internal cooling channel 21 can preferably be set to 1.0mm, and the hole spacing of the two internal cooling channels 21 can preferably be set to 4.0mm. It should be noted that in this embodiment, since the internal cooling channel 21 is a spiral cooling channel, the hole spacing of the two internal cooling channels 21 should refer to the hole spacing at their radially relative positions. Specifically, bottom cutting edges 111 are circumferentially distributed at the end of the cutting head 1. Specifically, the number of bottom cutting edges 111 and the number of cutting edges 11 are in a one-to-one correspondence, and the bottom cutting edges 111 are connected to the corresponding cutting edges 11. Since the bottom cutting edge 111 and the relationship between the bottom cutting edge 111 and the cutting edge 11 are relatively conventional designs, they will not be elaborated here. Example

[0028] See Figure 5 As shown, the difference between this embodiment and embodiment 1 is that both internal cooling channels 21 are straight cooling channels extending along the axial direction of the tool holder 2. When the cutting edge 11 is provided with two edges, these two internal cooling channels 21 are symmetrically arranged with respect to the axis of the tool holder 2. At the same time, the outlets of the two internal cooling channels 21 are respectively formed in two radially opposite chip removal grooves 12 to form liquid outlet holes 212, and the center of the liquid outlet hole 212 is located on the central axis of the corresponding internal cooling channel 21.

[0029] In the specific implementation process, the spiral and straight internal cooling channels 21 are selected according to actual needs. The two differ in manufacturing difficulty, precision requirements and cost. At the same time, due to the different extension paths, the spray angle, cooling area and cooling position of the liquid outlet 212 will be different, resulting in different cooling effects.

[0030] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A novel internally cooled tapered end mill, comprising a cutting head (1) and a tool holder (2) connected to each other, characterized in that, The cutting head (1) has a taper and is provided with multiple spiral cutting edges (11), with spiral chip grooves (12) formed between adjacent cutting edges (11). The cutting edge (11) adopts a helix angle gradually changing structure. Its helix angle gradually increases from the front end of the cutting head (1) to the tool holder (2). The range of helix angle variation is 20°-45°, and the helix angle gradually changes in a continuous linear manner from the front end of the cutting head (1) to the tool holder (2). The tool holder (2) is provided with two internal cooling channels (21), and the extension path of the internal cooling channels (21) is distributed along the axial direction of the tool holder (2). One end of the internal cooling channel (21) forms a liquid inlet hole (211) on the end face of the tool holder (2), and the other end extends to the cutting head (1) and forms a liquid outlet hole (212) in the chip removal groove (12) of the cutting head (1), and the liquid outlet hole (212) is on the extension path of the internal cooling channel (21). The outlets of the two internal cooling channels (21) respectively form liquid outlet holes (212) in two radially opposite chip removal grooves (12).

2. The novel internally cooled taper end mill according to claim 1, characterized in that, The taper of the cutting head (1) is 3°-30°, and the number of cutting edges (11) is set to 2-6.

3. The novel internally cooled taper end mill according to claim 1, characterized in that, Both internal cooling channels (21) are spiral cooling channels around the axis of the tool holder (2), and the liquid outlet (212) is located on the spiral extension path of the corresponding internal cooling channel (21).

4. The novel internally cooled taper end mill according to claim 1, characterized in that, Both internal cooling channels (21) are straight cooling channels extending along the axial direction of the tool holder (2), and the center of the liquid outlet (212) is located on the central axis of the corresponding internal cooling channel (21).

5. The novel internally cooled taper end mill according to claim 1, characterized in that, The width of the chip removal groove (12) gradually increases linearly from the front end of the cutting head (1) to the tool holder (2).

6. The novel internally cooled taper end mill according to any one of claims 1 or 5, characterized in that, The chip removal groove (12) forms a U-shaped arc-shaped smooth transition structure at the end of the tool holder (2).

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