Machining tool

Abstract

A machining tool comprises a tool bar, a tool body and a hemispherical tool bit, and the tool body is provided with a first cutting edge and a second cutting edge which spirally extend in the axis direction of the tool body. The first cutting edge and the second cutting edge are symmetrically distributed relative to the axis center of the cutter body and intersect on the cutter head to form an arc-shaped edge protruding outwards, and a chip groove spirally extending along the arc-shaped edge is formed in the portion, between the first cutting edge and the second cutting edge, of the cutter head. The spiral angle of the chip groove ranges from 34 degrees to 36 degrees, and the cutting edge contours of the first cutting edge and the second cutting edge coincide with the contour of the machining tool fed to the pipe groove in the axis direction of the tool bar according to the preset feeding speed.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter technology, and in particular to a machining tool. Background Technology

[0002] Milling cutters are used on milling machines to machine planes, steps, grooves, arc-shaped surfaces, and cut off workpieces. They have one or more cutting teeth so that each tooth can intermittently remove the excess material from the workpiece during operation. However, the helix angle of most milling cutters is usually between 35° and 42°. When machining hot runner plates, it is necessary to first use a flat end mill 300 to machine the groove shape, then use a ball end mill 400 to machine the bottom of the groove into an arc shape, and finally use a backing cutter 500 to bulge the side wall of the groove. It is impossible to complete the machining of the groove in one go, and chip removal is difficult, which can easily lead to chip accumulation, resulting in easy damage to the cutting edge of the tool and unevenness of the machined workpiece surface. Utility Model Content

[0003] This utility model provides a machining tool, which aims to solve at least one of the technical problems existing in the prior art.

[0004] This utility model also provides a machining tool for machining grooves on a hot runner plate. It includes a tool shank, a tool body, and a hemispherical tool head. The tool body is provided with two spirally extending first and second cutting edges along the axis of the tool body. The first and second cutting edges are symmetrically distributed with respect to the axis center of the tool body and converge on the tool head to form an outwardly convex arc-shaped edge. The tool head forms a chip removal groove spirally extending along the arc-shaped edge between the first and second cutting edges. The spiral angle of the chip removal groove is in the range of 34° to 36°.

[0005] Wherein, the cutting edge contours of the first and second cutting edges coincide with the contour of the machining tool fed into the tube groove along the axis of the tool holder at a preset feed speed.

[0006] In a machining tool according to one embodiment of the present invention, a chip-receiving groove is formed between the first cutting edge and the second cutting edge, extending spirally along the axis of the tool body, and the chip-receiving groove is connected to the chip-removing groove.

[0007] In a machining tool according to one embodiment of the present invention, the width of the chip groove gradually increases in the direction away from the central axis of the milling cutter.

[0008] In a machining tool according to one embodiment of the present invention, the ratio of the radius of the arc-shaped cutting edge to the maximum radius of the tool holder is greater than or equal to 0.6 and less than or equal to 0.8.

[0009] In a machining tool according to one embodiment of the present invention, the ratio of the radius of the arc-shaped cutting edge to the maximum radius of the tool body is greater than or equal to 0.5 and less than or equal to 0.9.

[0010] In a machining tool according to one embodiment of the present invention, the ratio of the radius of the arc-shaped blade to the core diameter of the tool body is greater than or equal to 1.2 and less than or equal to 1.4.

[0011] In a machining tool according to one embodiment of the present invention, the core diameter of the tool body is greater than or equal to 4 mm and less than or equal to 4.5 mm.

[0012] In a machining tool according to one embodiment of the present invention, the rake angle α of the first cutting edge and the second cutting edge is between -2° and -4°.

[0013] In a machining tool according to one embodiment of the present invention, the back angle β of the first cutting edge and the second cutting edge is between 7° and 9°.

[0014] In a machining tool according to one embodiment of the present invention, the surfaces of the first cutting edge and the second cutting edge are coated with a high-temperature resistant coating.

[0015] The technical solution provided in this application embodiment can include the following beneficial effects: This application designs a machining tool, including a tool holder, a tool body, and a hemispherical tool head. The tool body has two spirally extending first and second cutting edges along the tool body axis. The first and second cutting edges are symmetrically distributed with respect to the axis center of the tool body and converge on the tool head to form an outwardly convex arc-shaped edge. A chip removal groove is formed between the first and second cutting edges, spirally extending along the arc-shaped edge. The spiral angle of the chip removal groove is in the range of 34° to 36°, which not only ensures smooth chip removal but also effectively prevents tool damage and protects the workpiece. Simultaneously, the spiral groove structure makes the tool sharper. The cutting edge contours of the first and second cutting edges coincide with the contour of the tube groove to the hot runner plate that the machining tool feeds along the tool holder axis at a preset feed speed, allowing the machining tool to complete the tube groove machining in one pass, reducing machining steps and time, and improving machining efficiency.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of machining using existing machining tools;

[0019] Figure 2 yes Figure 1 A schematic diagram of the machining tool in the process;

[0020] Figure 3 yes Figure 2 Schematic diagram of the structure along section AA;

[0021] Figure 4 yes Figure 2 A schematic diagram of the machining tools used in the process.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Machining tool; 10. Tool head body; 10a. Tool head; 10b. Tool body; 11b. Chip groove; 11. First cutting edge; 12. Second cutting edge; 20. Tool holder;

[0024] 200. Hot runner plate; 201. Tube groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] It should also be understood that the terminology used in this utility model specification is merely for describing specific aspects of the present application. It is important to understand that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present application 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 the present application. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] like Figures 1 to 4 As shown, this application provides a machining tool 100 for machining the groove 201 on a hot runner plate 200. The machining tool 100 includes a tool shank 20, a tool body 10b, and a hemispherical tool head 10a. The tool head 10a is formed at the front end of the tool body 10b, and the end of the tool body 10b away from the tool head 10a is connected to the tool shank 20. The tool body 10b has two spirally extending first cutting edges 11 and second cutting edges 12 along the axial direction of the tool body 10b. The first cutting edges 11 and second cutting edges 12 are symmetrically distributed with respect to the axial center of the tool body 10b and converge on the tool head 10a to form an outwardly convex arc-shaped edge, which helps to balance cutting forces, reduce vibration, and improve machining stability.

[0029] In an optional embodiment, the cutting head 10a has a chip removal groove that extends spirally along the arc-shaped cutting edge between the first cutting edge 11 and the second cutting edge 12. The spiral angle of the chip removal groove is in the range of 34° to 36°. This not only ensures smooth chip removal and reduces the damage to the tool and workpiece caused by chip accumulation, but also effectively prevents tool damage and protects the workpiece. At the same time, the spiral groove structure can also make the machining tool 100 sharper.

[0030] In an optional embodiment, the cutting edge contours of the first cutting edge 11 and the second cutting edge 12 coincide with the contour of the tube groove 201 of the hot runner plate 200, which is fed by the machining tool 100 along the axis of the tool holder 20 at a preset feed speed, so that the machining of the tube groove 201 can be completed in one go, reducing machining steps and time, and improving machining efficiency.

[0031] In one optional embodiment, the helix angle of the chip evacuation groove is 35°, which effectively guides the chips to be smoothly discharged along the groove, preventing chip accumulation in the machining area, reducing friction between the chips and the tool and workpiece, lowering the risk of tool wear and workpiece surface damage, extending tool life and improving machining quality. Furthermore, this application combines the helix angle design with the arc-shaped cutting edge structure, thereby ensuring tool stability during machining and completing the machining of the groove 201 in one pass, avoiding errors caused by multiple machining operations.

[0032] In an optional embodiment, a chip-collecting groove 11b is formed between the first cutting edge 11 and the second cutting edge 12, extending spirally along the axis of the tool body 10b. The chip-collecting groove 11b is connected to the chip-removal groove, which enables the chips to be discharged quickly and continuously during the machining process, further reducing the possibility of chip accumulation and improving machining efficiency and tool durability.

[0033] By adopting the above technical method, since the chip groove 11b is connected to the chip removal groove to form a continuous chip discharge path, the chips can be smoothly discharged along the 35° helical angle direction of the chip groove 11b after entering the chip groove from the chip removal groove. The chip groove 11b not only effectively guides the chips to flow towards the chip removal groove, ensuring smooth chip discharge, but also provides temporary storage space for the chips generated by the machining tool 100 during the cutting process, preventing chip accumulation in the machining area, reducing chip interference with the tool and workpiece, ensuring the stability of the machining process, and enabling the tool to complete the high-precision machining of the tube groove 201 in one go.

[0034] In an optional embodiment, the width of the chip groove 11b gradually increases in the direction away from the central axis of the milling cutter, so that there is more space to accommodate the chips in this direction, avoiding chip accumulation in the groove; it also helps the chips to flow naturally outward in the chip groove 11b, reducing the possibility of chip clogging and ensuring that the chips can smoothly enter the chip evacuation groove and be discharged. The smooth flow of chips not only reduces the friction and impact of chips on the tool, extending the tool's life, but also reduces scratches and damage to the workpiece surface, improving the surface finish and precision of the machined surface.

[0035] In an alternative embodiment, the inner wall of the chip groove 11b is smoothed by grinding, which can significantly reduce the frictional resistance between the chips and the groove wall, making the chips flow more easily; it also helps the chips to pass through the chip groove 11b quickly and smoothly and enter the chip discharge groove, avoiding chip accumulation and blockage.

[0036] In one alternative implementation, the ratio of the radius R of the arc-shaped cutting edge to the maximum radius D2 / 2 of the tool holder 20 is greater than or equal to 0.6 and less than or equal to 0.8, to ensure that the arc-shaped cutting edge has sufficient strength and cutting ability, while avoiding a decrease in cutting efficiency due to an excessively large or small radius.

[0037] By adopting the above technical solution, since the ratio of the radius of the arc-shaped cutting edge to the maximum radius of the tool holder 20 is between 0.6 and 0.8, this application not only makes the tool more stable during cutting, reducing vibration and offset, and improving machining accuracy, but also reduces stress concentration during cutting, which helps to distribute the cutting force evenly on the tool, reducing the risk of tool breakage and wear, and extending the tool's service life. In particular, the precise cutting profile allows the tool to more accurately match the profile of the hot runner plate 200 groove 201, reducing machining errors, improving the surface finish and accuracy of the machined surface, and ensuring high-precision machining is completed in one pass.

[0038] In one optional implementation, the ratio of the radius R of the curved cutting edge to the maximum radius of the tool body 10b is greater than or equal to 0.5 and less than or equal to 0.9. This ensures that the curved cutting edge has sufficient strength and cutting ability, while avoiding a decrease in cutting efficiency due to an excessively large or small radius. The ratio of the radius R of the curved cutting edge to the radius of the tool body 10b directly affects the distribution of cutting force. A larger ratio results in a smoother curved edge and a more uniform distribution of cutting force, suitable for finishing. Conversely, a smaller ratio results in a sharper curved edge, suitable for roughing or efficient material removal.

[0039] For example, when the ratio of the radius R of the curved cutting edge to the maximum radius of the tool body 10b is ≥0.5, the radius of the curved cutting edge is at least half of the maximum radius of the tool body 10b, meaning the curvature of the curved cutting edge is relatively large, thus providing stronger cutting strength and stability, making it suitable for machining harder materials or applications requiring higher cutting forces. When the ratio of the radius R of the curved cutting edge to the maximum radius of the tool body 10b is ≤0.9, the radius of the curved cutting edge does not exceed 90% of the maximum radius of the tool body 10b, ensuring that the curved cutting edge is not too gentle, thereby maintaining high cutting efficiency and adaptability to complex contours. Therefore, when the ratio of the radius R of the curved cutting edge to the maximum radius of the tool body 10b is between 0.5 and 0.9, chips can be smoothly discharged through the chip evacuation groove, reducing chip accumulation and tool wear.

[0040] By adopting the above technical solution, since the ratio of the radius R of the arc-shaped cutting edge to the maximum radius of the tool body 10b is between 0.5 and 0.9, it can not only reduce the phenomenon of stress concentration during the cutting process, reduce the risk of tool breakage and wear, and extend the tool service life, but also help to distribute the cutting force evenly on the tool, so that the tool can adapt to different cutting depths and feed rates, ensure efficient cutting effect under various processing conditions, and further protect the tool.

[0041] In one optional implementation, the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b is greater than or equal to 1.2 and less than or equal to 1.4. This allows the curvature of the curved cutting edge to evenly distribute the cutting force, reducing vibration and improving machining stability. This ensures that the curved cutting edge has sufficient strength and cutting capability, while avoiding a decrease in cutting efficiency due to an excessively large or small radius. Specifically, when the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b is large, the chip removal groove can be wider, which is beneficial for chip removal; when the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b is small, the chip removal groove can be more compact to accommodate a smaller curved cutting edge radius.

[0042] For example, when the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b is ≥1.2, the radius of the curved cutting edge is at least 1.2 times the core diameter of the tool body 10b, meaning the curvature of the curved cutting edge is relatively large, thus providing sufficient cutting strength and stability while avoiding stress concentration caused by an excessively small curved cutting edge. When the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b is ≤1.4, the radius of the curved cutting edge does not exceed 1.4 times the core diameter of the tool body 10b, thus ensuring that the curved cutting edge is not too large, maintaining the compactness and flexibility of the tool, suitable for machining complex contours. Therefore, this application limits the ratio of the radius R of the curved cutting edge to the core diameter D1 of the tool body 10b to between 1.2 and 1.4, providing sufficient strength while maintaining a certain degree of flexibility to adapt to different machining needs.

[0043] In an optional embodiment, the core diameter D1 of the tool body 10b is greater than or equal to 4 mm and less than or equal to 4.5 mm to ensure that the tool body 10b has sufficient strength and rigidity to withstand the cutting force and torque during the cutting process, avoid tool deformation or breakage, make the tool more stable during the cutting process, reduce vibration and offset, and improve machining accuracy.

[0044] For example, when the core diameter D1 of the tool body 10b is ≥ 4 mm, the tool body 10b has a sufficient core diameter to provide high structural strength and rigidity, making it suitable for withstanding large cutting forces and preventing tool deformation or breakage during machining. When the core diameter D1 of the tool body 10b is ≤ 4.5 mm, the core diameter of the tool body 10b is moderate, maintaining the compactness and flexibility of the tool, making it suitable for machining smaller-sized tube grooves 201 or complex contours. Therefore, this application limits the core diameter D1 of the tool body 10b to between 4 mm and 4.5 mm, which allows chips to be smoothly discharged through the chip evacuation groove, reducing chip accumulation and tool wear.

[0045] In an optional implementation, when the core diameter D1 of the tool body 10b is 4.2 mm, the radius R of the arc-shaped cutting edge is between 5.04 mm and 5.88 mm. This not only provides the machining tool 100 with excellent cutting performance, machining quality and chip removal performance, but also makes it suitable for machining medium-sized tube grooves 201, taking into account strength, flexibility and efficiency to meet the requirements of high precision and high efficiency machining.

[0046] In an optional embodiment, the rake angle α of the first cutting edge 11 and the second cutting edge 12 is between -2° and -4°, making the cutting edges thicker, able to withstand greater cutting forces, and improving the tool's strength, wear resistance, and cutting stability. This makes it suitable for machining hard materials or applications requiring high cutting strength. The rake angle refers to the angle between the cutting edge and the workpiece contact surface; a rake angle α between -2° and -4° indicates that the cutting edge is inclined inwards relative to the workpiece surface.

[0047] In an optional embodiment, the rake angle α of the first cutting edge 11 and the second cutting edge 12 is -3°, which can not only reduce the contact area between the cutting edge and the workpiece, reduce friction and heat accumulation, thereby extending tool life; but also reduce vibration and improve the stability of the cutting process, especially in high-speed cutting or intermittent cutting.

[0048] In an optional embodiment, the clearance angle β of the first cutting edge 11 and the second cutting edge 12 is between 7° and 9°, which can effectively reduce the friction between the tool clearance face and the workpiece, thereby reducing the cutting force and cutting temperature. The clearance angle refers to the angle between the clearance face of the cutting edge and the workpiece surface; its main function is to reduce the friction between the tool clearance face and the workpiece, thereby reducing the cutting force and cutting temperature.

[0049] In an optional embodiment, the clearance angle β of the first cutting edge 11 and the second cutting edge 12 is 8°, which can not only reduce the friction between the tool and the workpiece, improve the surface finish of the machined surface, reduce the cutting temperature, reduce the thermal deformation of the workpiece and the tool, and obtain higher surface finish and contour accuracy; but also improve the impact resistance of the tool, making it suitable for intermittent cutting or machining of uneven materials.

[0050] In one optional embodiment, the surfaces of the first cutting edge 11 and the second cutting edge 12 are coated with a high-temperature resistant coating to maintain stable physical and chemical properties under high-temperature environments, improve the hardness of the cutting edges, prevent the tool from softening or failing due to high temperatures, reduce wear, and extend tool life. The high-temperature resistant coating materials include, but are not limited to, titanium nitride, aluminum titanium nitride, chromium nitride, and diamond coatings, etc., and this application does not impose any limitations.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. 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, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A machining tool for machining a tube channel on a hot runner plate, characterized in that The milling cutter comprises a cutter bar, a cutter body, and a cutter head in the shape of a hemisphere, the cutter body is provided with a first cutting edge and a second cutting edge extending spirally along the axis of the cutter body, the first cutting edge and the second cutting edge are symmetrically distributed with respect to the center axis of the cutter body and meet on the cutter head to form an outwardly convex arc-shaped edge, a chip flute extending spirally along the arc-shaped edge is formed between the first cutting edge and the second cutting edge on the cutter head, and the spiral angle of the chip flute is in the range of 34° to 36°. The first cutting edge and the second cutting edge are symmetrically distributed with respect to the center axis of the cutter body and meet on the cutter head to form an outwardly convex arc-shaped edge.

2. The machining tool according to claim 1, characterized in that The first cutting edge and the second cutting edge are symmetrically distributed with respect to the center axis of the cutter body and meet on the cutter head to form an outwardly convex arc-shaped edge.

3. The machining tool according to claim 2, characterized in that The first cutting edge and the second cutting edge are symmetrically distributed with respect to the center axis of the cutter body and meet on the cutter head to form an outwardly convex arc-shaped edge.

4. The machining tool according to claim 1, characterized in that The ratio of the radius of the arc-shaped edge to the maximum radius of the cutter bar is greater than or equal to 0.6 and less than or equal to 0.

8.

5. The machining tool according to claim 1, characterized in that The ratio of the radius of the arc-shaped edge to the maximum radius of the cutter body is greater than or equal to 0.5 and less than or equal to 0.

9.

6. The machining tool according to claim 1, characterized in that The ratio of the radius of the arc-shaped edge to the core diameter of the cutter body is greater than or equal to 1.2 and less than or equal to 1.

4.

7. A machining tool according to claim 6, characterised in that The core diameter of the cutter body is greater than or equal to 4 mm and less than or equal to 4.5 mm.

8. The machining tool according to claim 1, characterized in that The rake angle of the first cutting edge and the second cutting edge is between -2° and -4°.

9. The machining tool according to claim 1, characterized in that The relief angle of the first cutting edge and the second cutting edge is between 7° and 9°.

10. The machining tool according to claim 1, characterized in that The first cutting edge and the second cutting edge are coated with a high-temperature-resistant coating.

Images