A partitioned internal cooling drilling tool

Abstract

The application discloses a partitioned internal cooling drilling tool, which comprises a tool body, a center cutting blade arranged in the middle of the front end of the tool body, a peripheral cutting blade arranged at the edge of the tool body, a first center cooling channel and a first peripheral cooling channel arranged in the tool body, a center cooling liquid outlet arranged at the center cutting blade of the tool body, a peripheral cooling liquid outlet arranged at the peripheral cutting blade of the tool body, input ends of the first center cooling channel and the first peripheral cooling channel communicated with a cooling liquid storage channel, an output end of the first center cooling channel communicated with the center cooling liquid outlet, an output end of the first peripheral cooling channel communicated with the peripheral cooling liquid outlet, and the cross-sectional areas of the first center cooling channel and the first peripheral cooling channel are respectively S A and S a , and 0.5S a ≤S A ≤0.9S a The application has the advantages that the cooling channels are arranged in partitions to meet the cooling requirements of different areas, improve the cooling efficiency, prolong the service life and the like.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and more specifically to a zoned cold drilling tool. Background Technology

[0002] In drilling, drilling tools have a center cutting insert and peripheral cutting inserts. During machining, the center part first contacts the workpiece, and the cutting speed from the center of rotation to the maximum cutting diameter of the cutting head changes from zero to maximum. During machining, the center cutting insert has a low linear velocity and less frictional heat generation, but there is a problem of chip breakage and tool failure due to chip compression caused by difficulty in chip breaking. On the other hand, the peripheral cutting insert has a high linear velocity and generates more heat, so tool cooling is particularly important.

[0003] Chinese patent CN113020667B discloses an internally cooled split-type drilling tool. It divides the cooling channel into multiple segments, and the outlet of the first cooling channel, which is closer to the cutting tool, is aligned with the cutting tool as much as possible to ensure the cooling effect. This reduces the setting accuracy of the second and third cooling channels, which are farther away from the cutting tool, and thus reduces the manufacturing difficulty of the cooling channel. However, the entire cooling channel formed by each segment of the internally cooled tool is symmetrically set, that is, each cooling channel is the same, which cannot meet the cooling effect required by the center and periphery of the tool. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a partitioned cooling channel to meet the cooling needs of different areas, improve cooling efficiency, and extend service life of the internal cooling drilling tool.

[0005] The present invention further provides a zoned cooling drilling tool with a graded cooling channel arrangement in each area to increase the flow rate of the coolant, thereby improving the chip breaking ability and cooling efficiency of the cutting tool.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A partitioned cold drilling tool includes a tool body. A central cutting insert is located at the center of the tool body's front end, and peripheral cutting inserts are located at its edges. The tool body contains a first central cooling channel and a first peripheral cooling channel. A central coolant outlet is located facing the central cutting insert, and a peripheral coolant outlet is located facing the peripheral cutting inserts. The input ends of both the first central and first peripheral cooling channels are connected to a coolant storage channel. The output end of the first central cooling channel is connected to the central coolant outlet, and the output end of the first peripheral cooling channel is connected to the peripheral coolant outlet. The cross-sectional areas of the first central and first peripheral cooling channels are respectively S... A and S a It should meet 0.5S. a ≤SA ≤0.9S a .

[0007] As a further improvement to the above technical solution: A second central cooling channel connects the first central cooling channel and the central coolant outlet. The cross-sectional area of ​​the second central cooling channel is S. B It should meet the requirement of 1.2S. B ≤S A ≤2S B .

[0008] The output end of the second central cooling channel is connected to the third central cooling channel, and the central coolant outlet is located at the output end of the third central cooling channel.

[0009] The first central cooling channel is linear, and the second central cooling channel is arranged around the central axis of the cutter body.

[0010] The axial helix angle of the first central cooling channel is α1, the axial spiral helix angle of the second central cooling channel is β1, and the axial helix angle of the third central cooling channel is θ1, which should satisfy: 0°≤α1≤10°, 10°≤β1≤45°, 20°≤θ1≤50°.

[0011] A second peripheral cooling channel connects the first peripheral cooling channel to the peripheral coolant outlet, and the cross-sectional area of ​​the second peripheral cooling channel is S. b S should be satisfied b ≤S a ≤1.5S b .

[0012] The output end of the second peripheral cooling channel is connected to the third peripheral cooling channel, and the peripheral coolant outlet is located at the output end of the third peripheral cooling channel.

[0013] The first peripheral cooling channel is linear, and the second peripheral cooling channel is arranged around the central axis of the cutter body.

[0014] The axial helix angle of the first peripheral cooling channel is α2, the axial helix angle of the second peripheral cooling channel is β2, and the axial helix angle of the third peripheral cooling channel is θ2, which should satisfy: 0°≤α2≤10°, 10°≤β2≤45°, 20°≤θ2≤50°.

[0015] The cross-sectional area of ​​the coolant storage channel is S, and it should satisfy: 1.5 (S a + S A )≤S≤5(S a + S A ).

[0016] Compared with the prior art, the advantages of the present invention are as follows: The partitioned cold drilling tool disclosed in this invention is provided with a first central cooling channel and a first peripheral cooling channel to provide partitioned cooling for the central cutting insert and the peripheral cutting insert. The input ends of the first central cooling channel and the first peripheral cooling channel are both connected to the same coolant storage channel, and the cross-sectional area S of the first central cooling channel is... A The cross-sectional area S of the first peripheral cooling channel is smaller than that of the first peripheral cooling channel. a Therefore, the coolant flow rate in the first central cooling channel is relatively fast, which can assist in chip breaking and chip removal, and avoid the failure of the central cutting tool due to the difficulty in chip breaking. The coolant flow rate in the first peripheral cooling channel is relatively large, which can quickly reduce the heat generated by friction, match the peripheral cutting tool with higher machining line speed, and improve the cooling efficiency. By cooling the tool in sections, the different cooling needs of different areas of the tool can be met, thereby improving the overall tool life.

[0017] Furthermore, the partitioned cold drilling tool disclosed in this invention, through the hierarchical arrangement of the first central cooling channel, the first central cooling channel and the third central cooling channel, and the hierarchical arrangement of the first peripheral cooling channel, the first peripheral cooling channel and the third peripheral cooling channel, with the cross-sectional area of ​​the central cooling channel and the peripheral cooling channel decreasing sequentially at each level, increases the flow rate of the coolant, thereby further improving the tool's chip-breaking ability, cooling efficiency and cooling effect.

[0018] Furthermore, the partitioned cold drilling tool disclosed in this invention, by setting a third central cooling channel and a third peripheral cooling channel, and making the central coolant outlet on the third central cooling channel face the central cutting tool, and the peripheral coolant outlet on the third peripheral cooling channel face the peripheral cutting tool, can ensure the flow direction of the coolant, thereby reducing the setting accuracy of the first central cooling channel, the second central cooling channel, the first peripheral cooling channel and the second peripheral cooling channel, and achieving the goal of ensuring the cooling effect of the coolant while reducing the manufacturing difficulty and improving the product qualification rate. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the cold drilling tool within the partition of this invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the cooling channel in the cold drilling tool within the partition of the present invention.

[0021] Figure 3 This is a schematic diagram of the main structure of the cooling channel in the cold drilling tool within the partition of the present invention.

[0022] Figure 4 This is a schematic diagram of the main structure of the cold drilling tool within the partition of the present invention.

[0023] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of AA.

[0024] Figure 6 yes Figure 4 A schematic diagram of the cross-sectional structure of BB.

[0025] Figure 7 yes Figure 4 A schematic diagram of the cross-sectional structure of CC.

[0026] Figure 8 This is a three-dimensional structural schematic diagram of the second embodiment of the cold drilling tool within the partition of the present invention.

[0027] Figure 9 This is a three-dimensional structural schematic diagram of the second embodiment of the cooling channel in the cold drilling tool within the partition of the present invention.

[0028] The labels in the diagram represent: 1. Tool body; 21. Center cutting insert; 22. Peripheral cutting insert; 31. First center cooling channel; 32. First peripheral cooling channel; 41. Center coolant outlet; 42. Peripheral coolant outlet; 51. Second center cooling channel; 52. Second peripheral cooling channel; 61. Third center cooling channel; 62. Third peripheral cooling channel; 7. Coolant storage channel; 8. Cutting components. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1 Figures 1 to 7 This invention illustrates an embodiment of a partitioned cold drilling tool. The tool includes a tool body 1, a central cutting insert 21 at the front center of the tool body 1, and peripheral cutting inserts 22 at the edges. The tool body 1 contains a first central cooling channel 31 and a first peripheral cooling channel 32. A central coolant outlet 41 is located towards the central cutting insert 21, and a peripheral coolant outlet 42 is located towards the peripheral cutting inserts 22. The input ends of both the first central cooling channel 31 and the first peripheral cooling channel 32 are connected to a coolant storage channel 7. The output end of the first central cooling channel 31 is connected to the central coolant outlet 41, and the output end of the first peripheral cooling channel 32 is connected to the peripheral coolant outlet 42. The cross-sectional areas of the first central cooling channel 31 and the first peripheral cooling channel 32 are S1 and S2, respectively. A and S a It should meet 0.5S. a ≤S A ≤0.9S a .

[0034] Within this partition, cold-cutting tools are provided with a first central cooling channel 31 and a first peripheral cooling channel 32 to provide partitioned cooling for the central cutting insert 21 and the peripheral cutting insert 22. The input ends of both the first central cooling channel 31 and the first peripheral cooling channel 32 are connected to the same coolant storage channel 7. The cross-sectional area S of the first central cooling channel 31 is... A The cross-sectional area S of the first peripheral cooling channel 32 is smaller than that of the first peripheral cooling channel 32. a Therefore, the coolant flow rate in the first central cooling channel 31 is relatively fast, which can assist in chip breaking and chip removal, preventing the central cutting insert 21 from breaking due to difficulty in chip breaking. Meanwhile, the coolant flow rate in the first peripheral cooling channel 32 is larger, which can quickly reduce the heat generated by friction, matching the peripheral cutting insert 22 with its higher machining linear speed and improving cooling efficiency. By partitioning the tool for cooling, the different cooling needs of different areas of the tool can be met, thereby improving the overall tool life. Preferably, S a =28mm 2 S A =23mm 2 .

[0035] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, a second central cooling channel 51 connects the first central cooling channel 31 and the central coolant outlet 41. The cross-sectional area of ​​the second central cooling channel 51 is S. B It should meet the requirement of 1.2S. B ≤S A ≤2S B The first central cooling channel 31, connected to a second central cooling channel 51 with a smaller cross-sectional area, significantly increases the coolant flow rate, allowing the coolant to rush towards the chips at a higher velocity, further improving the tool's chip breaking and removal capabilities. The change in cross-sectional area between the first and second central cooling channels 31 enables graded delivery of coolant within the central cooling channels, further enhancing the cooling effect. Preferably, S B =15mm 2 .

[0036] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the output end of the second central cooling channel 51 is connected to the third central cooling channel 61, and the central coolant outlet 41 is located at the output end of the third central cooling channel 61. By setting the third central cooling channel 61 and ensuring that the central coolant outlet 41 on the third central cooling channel 61 faces the central cutting blade 21, the flow direction of the coolant can be guaranteed, thereby reducing the setting accuracy of the first central cooling channel 31 and the second central cooling channel 51. This achieves the goal of ensuring the cooling effect of the coolant while reducing the manufacturing difficulty of the first central cooling channel 31 and the second central cooling channel 51, and improving the product qualification rate. Preferably, the cross-sectional area of ​​the third central cooling channel 61 is S. D S D =7, which is further reduced compared to the second central cooling channel 51. Through the multi-stage reduction of cross-sectional area, the flow rate of coolant is further increased, thereby improving the chip breaking ability of the tool.

[0037] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the first central cooling channel 31 is linear, and the second central cooling channel 51 is arranged around the central axis of the tool body 1. This is more adaptable to the shape of the drilling tool and facilitates the manufacture of the first central cooling channel 31 and the second central cooling channel 51.

[0038] Furthermore, such as Figure 3 As shown, in this embodiment, the axial helix angle of the first central cooling channel 31 is α1, the axial helix angle of the second central cooling channel 51 is β1, and the axial helix angle of the third central cooling channel 61 is θ1. To reduce the difficulty of tool manufacturing, ensure high-speed discharge of cutting fluid, improve the chip-breaking ability of the tool, and precisely adjust the spray angle of the coolant, the following conditions should be met: 0°≤α1≤10°, 10°≤β1≤45°, 20°≤θ1≤50°. Preferably, α1=10°, β1=15°, and θ1=30°.

[0039] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 In this embodiment, a second peripheral cooling channel 52 connects the first peripheral cooling channel 32 and the peripheral coolant outlet 42. The cross-sectional area of ​​the second peripheral cooling channel 52 is S. b S should be satisfied b ≤S a ≤1.5S b The first peripheral cooling channel 32 connects to the second central cooling channel 51, enabling graded delivery of coolant within the peripheral cooling channels. This increases the coolant flow rate, facilitating faster temperature reduction of the peripheral cutting blades 22 and improving cooling efficiency. Preferably, S b =18mm 2 .

[0040] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the output end of the second peripheral cooling channel 52 is connected to the third peripheral cooling channel 62, and the peripheral coolant outlet 42 is located at the output end of the third peripheral cooling channel 62. By setting the third peripheral cooling channel 62 and ensuring that the peripheral coolant outlet 42 on the third peripheral cooling channel 62 faces the peripheral cutting blade 22, the flow direction of the coolant can be guaranteed, thereby reducing the setting accuracy of the first peripheral cooling channel 32 and the second peripheral cooling channel 52. This achieves the goal of ensuring the cooling effect of the coolant while reducing the manufacturing difficulty of the first peripheral cooling channel 32 and the second peripheral cooling channel 52, and improving the product qualification rate. Preferably, the cross-sectional area of ​​the third peripheral cooling channel 62 is S. d S d =12, which is further reduced compared to the second peripheral cooling channel 52. Through the multi-stage reduction of cross-sectional area, the flow rate of coolant is further increased, thereby improving the cooling effect.

[0041] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 In the embodiment shown, the first peripheral cooling channel 32 is linear, and the second peripheral cooling channel 52 is arranged around the central axis of the tool body 1. This design is more adaptable to the shape of the drilling tool and facilitates the manufacture of the first peripheral cooling channel 32 and the second peripheral cooling channel 52.

[0042] Furthermore, such as Figure 3 As shown, in this embodiment, the axial helix angle of the first peripheral cooling channel 32 is α2, the axial spiral helix angle of the second peripheral cooling channel 52 is β2, and the axial helix angle of the third peripheral cooling channel 62 is θ2. In order to reduce the difficulty of tool manufacturing, ensure high-speed discharge of cutting fluid, improve cooling efficiency, and accurately adjust the spray angle of the coolant, the following conditions should be met: 0°≤α2≤10°, 10°≤β2≤45°, 20°≤θ2≤50°.

[0043] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, in this embodiment, the cross-sectional area of ​​the coolant storage channel 7 is S. To ensure sufficient coolant for distribution when the first central cooling channel 31 and the first peripheral cooling channel 32 are distributed, the following condition should be met: 1.5 (S a + S A )≤S≤5(S a + S A Preferably, S = 350 mm.

[0044] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the coolant storage channel 7, the first central cooling channel 31 and the first peripheral cooling channel 32 are provided on the handle of the tool body 1, and the second central cooling channel 51, the third central cooling channel 61, the second peripheral cooling channel 52 and the third peripheral cooling channel 62 are provided on the cutting part of the tool body 1, which facilitates manufacturing.

[0045] Example 2 Figure 8 and Figure 9This paper illustrates another embodiment of the intra-partition cold drilling tool of the present invention. In this embodiment, the central cutting area at the end of the tool body 1 is composed of rotationally symmetrical cutting components 8. Multiple peripheral cutting inserts 22 are provided along the edge of the end of the tool body 1. Each peripheral cutting insert 22 has a first peripheral cooling channel 32, a second peripheral cooling channel 52, and a third peripheral cooling channel 62. Simultaneously, a set of first central cooling channels 31 and second central cooling channels 51 are provided with cutting components 8 facing the center. The coolant storage channel 7 is located within the tool body 1. This type of tool exhibits significant efficiency advantages when drilling diameters of Φ30mm and above, further expanding the application range of this intra-partition cold drilling tool.

[0046] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A cold drilling tool with partitioned sections, comprising a tool body (1), wherein a central cutting insert (21) is provided at the center of the front end of the tool body (1), and peripheral cutting inserts (22) are provided at the edge, characterized in that: The cutter body (1) is provided with a first central cooling channel (31) and a first peripheral cooling channel (32). The cutter body (1) has a central coolant outlet (41) facing the central cutting blade (21) and a peripheral coolant outlet (42) facing the peripheral cutting blade (22). The input ends of the first central cooling channel (31) and the first peripheral cooling channel (32) are connected to the coolant storage channel (7). The output end of the first central cooling channel (31) is connected to the central coolant outlet (41), and the output end of the first peripheral cooling channel (32) is connected to the peripheral coolant outlet (42). The cross-sectional areas of the first central cooling channel (31) and the first peripheral cooling channel (32) are respectively S A and S a It should meet 0.5S. a ≤S A ≤0.9S a A second central cooling channel (51) connects the first central cooling channel (31) and the central coolant outlet (41), and the cross-sectional area of ​​the second central cooling channel (51) is S. B It should meet the requirement of 1.2S. B ≤S A ≤2S B The output end of the second central cooling channel (51) is connected to the third central cooling channel (61), and the central coolant outlet (41) is located at the output end of the third central cooling channel (61).

2. The cold drilling tool within a partition according to claim 1, characterized in that: The first central cooling channel (31) is straight, and the second central cooling channel (51) is arranged around the central axis of the blade body (1).

3. The cold drilling tool within a partition according to claim 2, characterized in that: The axial helix angle of the first central cooling channel (31) is α1, the axial spiral helix angle of the second central cooling channel (51) is β1, and the axial helix angle of the third central cooling channel (61) is θ1. These conditions should satisfy: 0°≤α1≤10°, 10°≤β1≤45°, and 20°≤θ1≤50°.

4. The cold drilling tool within a zone according to any one of claims 1 to 3, characterized in that: A second peripheral cooling channel (52) connects the first peripheral cooling channel (32) and the peripheral coolant outlet (42), and the cross-sectional area of ​​the second peripheral cooling channel (52) is S. b S should be satisfied b ≤S a ≤1.5S b .

5. The cold drilling tool within a partition according to claim 4, characterized in that: The output end of the second peripheral cooling channel (52) is connected to the third peripheral cooling channel (62), and the peripheral coolant outlet (42) is located at the output end of the third peripheral cooling channel (62).

6. The cold drilling tool within a partition according to claim 5, characterized in that: The first peripheral cooling channel (32) is straight, and the second peripheral cooling channel (52) is arranged around the central axis of the blade body (1).

7. The cold drilling tool for partitioned cutting according to claim 6, characterized in that: The axial helix angle of the first peripheral cooling channel (32) is α2, the axial helix angle of the second peripheral cooling channel (52) is β2, and the axial helix angle of the third peripheral cooling channel (62) is θ2. They should satisfy: 0°≤α2≤10°, 10°≤β2≤45°, 20°≤θ2≤50°.

8. The cold drilling tool within a zone according to any one of claims 1 to 3, characterized in that: The cross-sectional area of ​​the coolant storage channel (7) is S, and should satisfy: 1.5 (S a + S A )≤S≤5(S a + S A ).

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