Sealing groove milling cutter

Abstract

The utility model provides a seal groove milling cutter which comprises a cutter handle and a cutter head which is arranged on the cutter handle and is coaxial with the cutter handle, the head of the cutter head is provided with a plurality of cutting edges which are arranged at intervals along the circumferential direction of the cutter head, and the plurality of cutting edges are spiral and are consistent in rotation direction. One end, far away from the end part of the cutting edge, of the cutting part of each cutting edge inclines inwards relative to the axis of the tool bit to form a dovetail shape, an included angle formed between each cutting edge and the axis of the tool bit is a helical angle, and the adjacent helical angles are arranged at equal intervals. According to the sealing groove milling cutter disclosed by the utility model, the inclined cutting part and each helical angle are arranged at equal intervals, so that the machining precision of a machined workpiece can be ensured, and meanwhile, the sealing effect of the workpiece is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to milling cutter technical field, especially a sealing groove milling cutter. BACKGROUND

[0002] With the development of industrial technology, the requirement of equipment sealing performance is higher and higher, many products and equipment need to realize sealing assembly through sealing ring, for example, the interface of cooling water channel and oil channel often needs to install sealing ring to ensure that liquid or gas does not leak. In the process of mold design, sealing groove needs to be opened, and sealing ring is placed in the sealing groove to realize its sealing effect.

[0003] At present, after the sealing groove is processed by using the existing milling cutter, the sealing ring can not be fixed well, thereby affecting the sealing effect of the device. Moreover, under the working condition of high-speed cutting, the milling cutter generates a large centrifugal inertia force due to high speed, so that the cutting edge generates radial displacement, and suddenly generates fluctuation during processing, so that the cutting force is unstable, and the workpiece surface may appear undulating uneven phenomenon, thereby affecting the processing precision. SUMMARY

[0004] Therefore, the utility model aims at providing a sealing groove milling cutter to ensure the processing precision of the workpiece and improve the sealing effect of the workpiece.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A sealing groove milling cutter, comprising a handle, and a tool bit coaxially arranged on the handle, the head of the tool bit is provided with a plurality of cutting edges arranged at a circumferential interval, the plurality of cutting edges are spiral and have consistent rotation directions, and the cutting part of each cutting edge is inclined inward relative to the axis of the tool bit away from one end of the cutting edge end, forming a dovetail shape.

[0007] The included angle between each cutting edge and the axis of the tool bit is a spiral angle, and each adjacent spiral angle is equally divided.

[0008] Further, the angle of each spiral angle is between 24.98° and 25.02°.

[0009] Further, the inclination angle of each cutting part is between 34.99° and 35.01°.

[0010] Further, the end of each cutting edge is provided with a corresponding end edge, the connection between each end edge and the corresponding cutting part is a fillet structure, and the radius R of the fillet is between 2.485mm and 2.515mm.

[0011] Further, the side of each of the cutting edges is provided with a peripheral edge, and the first clearance angle of each of the peripheral edges is 13°, and the second clearance angle of each of the peripheral edges is 26°.

[0012] Further, the rake angle of each of the end edges is 2°, and / or the first clearance angle of each of the end edges is 8°, and the second clearance angle of each of the end edges is 16°.

[0013] Further, a chip groove is formed between two adjacent cutting edges.

[0014] Further, the tail of the tool head is provided with a connecting section for connecting the tool handle.

[0015] The connecting section is in the shape of a circular truncated cone, and the outer diameter of the connecting section gradually increases in the direction away from the tool head, and the outer diameter of the large end of the connecting section is the same as the diameter of the tool handle.

[0016] Further, the tool head has a core portion, and the ratio of the diameter of the core portion to the diameter of the tool handle is between 0.6 and 0.7, and / or the ratio of the length of the tool head to the total length of the tool head and the tool handle is between 0.2 and 0.25.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The sealing groove milling cutter disclosed by the utility model is characterized in that each cutting part is arranged to be inclined to form a dovetail shape, so that the sealing groove after milling has a structure of being narrow at the top and wide at the bottom, thereby being capable of fixing the sealing ring well, thereby being capable of improving the sealing effect.

[0019] Secondly, by limiting the angle of each adjacent spiral angle, the cutting force can be stabilized, the machining precision is ensured, meanwhile, the appropriate angle of the spiral angle can reduce the risk of damage of the milling cutter edge, and further improve the durability of the tool.

[0020] By arranging the chamfer structure, the workpiece surface is not easy to scratch, the workpiece surface can be effectively protected, meanwhile, the tool can be more smoothly transitioned when milling the corner, the tool wear rate is reduced, and therefore the cutting performance is maintained.

[0021] Furthermore, the first and second clearance angles of the peripheral cutting edge are limited in angle, and by selecting appropriate angles, the friction between the cutting edge and the workpiece can be reduced, so that the cutting speed can be increased, thereby improving the cutting efficiency, and at the same time, when hard points in the material are encountered during milling, the cutting edge can have sufficient strength to resist these external forces and prevent chipping.

[0022] By limiting the rake angle of the end cutting edge, the cutting force can be reduced, so that the milling cutter can adopt a higher cutting speed and feed rate during cutting, thereby improving the cutting efficiency. Furthermore, by limiting the clearance angle of the end cutting edge, the components of the cutting force in different directions can be balanced, thereby reducing the phenomenon of tool deflection caused by unbalanced cutting force, and thereby improving the machining accuracy.

[0023] Furthermore, by providing the chip flute, the chip can be smoothly discharged, ensuring the continuity of the milling process, and also helping to reduce the accumulation of heat in the cutting area and reduce the cutting temperature. The outer diameter of the connecting section gradually increases in the direction away from the tool head, and the outer diameter of the large end of the connecting section is consistent with the diameter of the shank, achieving the effect of gradually changing the outer diameter, so that the stress can be more evenly distributed on the shank, reducing the risk of shank fracture, and also helping to improve the connection stability and improve the structural strength of the tool.

[0024] By limiting the ratio between the diameter of the core and the diameter of the shank, the natural frequency of the tool can be optimized, thereby avoiding resonance during milling, making the tool more stable during milling. At the same time, by limiting the ratio of the length of the tool head to the total length of the shank and the tool head to be between 0.2 and 0.25, the structural strength of the tool can be improved, thereby prolonging the service life of the tool, and at the same time, the milling accuracy can be improved, thereby helping to ensure the quality of the product, and the structure is reasonable and easy to design and implement. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of the present application, are used to provide a further understanding of the present application and are incorporated herein for explanation along with the descriptions. In the drawings:

[0026] Figure 1 The overall structure of the sealing groove milling cutter is shown in the schematic view.

[0027] Figure 2 The structure shown in A is an enlarged view. Figure 1

[0028] The structure shown in A is an enlarged view. Figure 3 Figure 1 The structure shown in A is an enlarged view.

[0029] ​Description of reference numerals:

[0030] 1. Handle;

[0031] 2. Cutting head; 21. Cutting edge; 211. Cutting portion; 212. End edge; 213. Circumferential edge;

[0032] 3. Connecting section;

[0033] 4. Chip groove;

[0034] γ1, the angle of the helix angle; γ2, the inclination angle of the cutting part; α1, the first clearance angle of the peripheral edge; α2, the second clearance angle of the peripheral edge; β1, the rake angle of the end edge; β2, the first clearance angle of the end edge; β3, the second clearance angle of the end edge;

[0035] D1, the diameter of the core; D2, the diameter of the shank; L, the total length of the cutter head and shank; L1, the length of the cutter head; L2, the length of the connecting section; L3, the length of the shank; L4, the extension length of the chip groove. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0038] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Example 1

[0041] This embodiment relates to a sealing groove milling cutter, which can ensure the machining accuracy of the workpiece and improve the sealing effect of the workpiece. Figures 1 to 3 As shown in the figure, the sealed groove milling cutter of this embodiment includes a shank 1 and a cutter head 2 arranged on the shank 1 and coaxially with the shank 1. The head of the cutter head 2 is provided with a plurality of cutting edges 21 arranged at intervals along the circumference of the cutter head 2. The plurality of cutting edges 21 are spiral and have the same rotation direction, and the cutting portion 211 of each cutting edge 21 is inclined inwardly relative to the axis of the cutter head 2 at one end away from the end of the cutting edge 21, forming a dovetail shape.

[0042] Here, by tilting each cutting portion 211 to form a dovetail shape, the milled sealing groove forms a structure that is narrow at the top and wide at the bottom, thereby being able to well fix the sealing ring and thus improving the sealing effect.

[0043] The angle formed between each cutting edge 21 and the axis of the cutter head 2 is the helix angle, and adjacent helix angles are arranged equally. This arrangement ensures that the cutting thickness and cutting width of each cutting edge 21 change in the same pattern, preventing sudden fluctuations in cutting force during the cutting process, thereby reducing surface roughness and improving machining accuracy.

[0044] In the specific structure, the cutting portion 211 of this embodiment can be configured as a straight edge. It should be understood that in other embodiments, the cutting portion 211 can be configured as a plurality of arc-shaped edges with gradually changing radians and sequentially inscribed with each other, or the cutting portion 211 can be configured as a smooth arc-shaped edge.

[0045] Furthermore, the cutting edges 21 in this embodiment can be provided as three, evenly spaced, with the angle between two adjacent cutting edges 21 being 120°. This improves the tool's impact resistance, reduces the risk of chipping, and ultimately extends the tool's life. Of course, the specific number of cutting edges 21 can also be designed and adjusted based on actual needs, such as two or four.

[0046] Based on the above overall introduction, in this embodiment, as a preferred implementation form, as Figure 1 As shown in , the angle γ1 of each helix angle is between 24.98° and 25.02°. This setting, by limiting the angle γ1 of each adjacent helix angle, helps stabilize the cutting force and ensure machining accuracy. At the same time, a suitable helix angle γ1 can reduce the risk of milling cutter edge damage and further improve tool durability.

[0047] In the specific structure, the angle of the spiral angle γ1 can be designed and adjusted according to actual requirements, for example, it can be set to 24.98°, 25°, 25.02°, etc., as long as the accuracy during processing can be ensured. Specifically, the angle of the spiral angle γ1 of the embodiment is set to 25°.

[0048] Furthermore, as a preferred implementation form, as shown in Figure 1 the inclination angle γ2 of each cutting portion 211 in the embodiment is between 34.99° and 35.01°. The advantage of this setting is that by limiting the inclination angle γ2 of the cutting portion 211, the peak value of the cutting force can be reduced, the process of the milling cutter entering the workpiece is smoother, thereby reducing the stress value of the cutting edge 21 in the initial cutting stage, effectively reducing the probability of the occurrence of the chipping phenomenon, and further facilitating the extension of the service life of the milling cutter.

[0049] It can be understood that if the inclination angle γ2 of the cutting portion 211 (i.e., the included angle between the cutting portion 211 and the axis of the tool head 2) is set too large, the cutting force will be unstable, the vibration will be intensified, and the required machining accuracy cannot be achieved. If the inclination angle γ2 of the cutting portion 211 is set too small, the sealing groove after milling cannot well fix the sealing ring, thereby being not conducive to improving the sealing effect of the workpiece.

[0050] Specifically, the inclination angle γ2 of the cutting portion 211 can be set to 35°, thereby being able to improve the fixing effect of the sealing ring while ensuring the machining accuracy, and further improving the sealing effect of the workpiece. Of course, in addition to being set to 35°, it can also be adjusted according to actual requirements, for example, it can also be set to 34.99°, 35.01°, etc.

[0051] In addition, in the embodiment, as a preferred implementation form, as shown in Figure 2 each end of each cutting edge 21 is provided with a corresponding end edge 212, and the connection between each end edge 212 and the corresponding cutting portion 211 is a fillet structure, and the radius R of the fillet is in the range of 2.485 mm to 2.515 mm.

[0052] By setting the fillet structure, the workpiece surface is not easily scratched, the workpiece surface can be effectively protected, and at the same time, the tool can be more smoothly transitioned when milling the corner, the tool wear rate is reduced, and the cutting performance is maintained.

[0053] Specifically, the radius R of the fillet of the embodiment can be set to 2.5 mm. Of course, it can also be designed and adjusted according to actual requirements, for example, it can be set to 2.485 mm, 2.515 mm, etc. As long as the radius R of the fillet is in the range of 2.5 ± 0.015 mm, it can be ensured.

[0054] In addition, in the embodiment, as a preferred implementation form, as shown in Figure 2 and Figure 3 each side of each cutting edge 21 is provided with a peripheral edge 213, and the first clearance angle a1 of each peripheral edge 213 is 13°, and the second clearance angle a2 of each peripheral edge 213 is 26°.

[0055] Here, the first clearance angle a1 and the second clearance angle of the peripheral edge 213 are limited by angles, and by selecting appropriate angles, it is helpful to reduce the friction between the cutting edge 21 and the workpiece, so as to improve the cutting speed, and further improve the cutting efficiency, and at the same time, when hard points in the material are encountered in the milling process, the cutting edge 21 can have enough strength to resist these external forces, and prevent the occurrence of chipping.

[0056] Meanwhile, as a preferred implementation form, as shown in Figure 1 the rake angle b1 of each end edge 212 of the embodiment is 2°. By limiting the rake angle b1 of the end edge 212, the cutting force can be reduced, so that the milling cutter can adopt a higher cutting speed and feed rate during cutting, and further improve the cutting efficiency.

[0057] And the first clearance angle of each end edge 212 is 8°, and the second clearance angle b2 of each end edge 212 is 16°. Here, the clearance angle of the end edge 212 is limited, which can balance the components of the cutting force in different directions, thereby reducing the phenomenon of letting the tool due to unbalanced cutting force, and improving the machining precision.

[0058] It is worth mentioning that the first clearance angle a1 of the peripheral edge 213, the second clearance angle a2 of the peripheral edge 213, the rake angle b1 of the end edge 212, the first clearance angle of the end edge 212, the second clearance angle b2 of the end edge 212, and the first clearance angle b3 of the end edge 212 all have an error range of ±0.02°, as long as these angles are within the error range.

[0059] In addition, in the embodiment, as a preferred implementation form, as shown in Figure 1 and Figure 2 a chip groove 4 is formed between the two adjacent cutting edges 21. Here, by setting the chip groove 4, it can ensure that the chips are smoothly discharged, ensure the continuity of the milling process, and also help to reduce the accumulation of heat in the cutting area and reduce the cutting temperature.

[0060] It should be noted that if the extension length L4 of the chip groove 4 is set too long, the waste materials are easy to be wound or stacked together in the groove, causing blockage. If the extension length L4 of the chip groove 4 is set too short, the waste materials cannot be completely constrained from discharging, and are easy to fly out of the chip groove 4, affecting the milling operation. Specifically, the extension length L4 of the chip groove 4 in the embodiment can be set to 7mm. Of course, in addition to being set to 7mm, it can also be designed and adjusted according to actual needs, for example, 6mm, 8mm, etc.

[0061] In view of the requirement of tool structure strength, in the embodiment, as a preferred implementation form, as shown in Figure 1 Figure 1 The tail of the tool head 2 is provided with a connecting section 3, which is used to connect the tool shank 1. Moreover, the connecting section 3 is in the shape of a circular truncated cone, and the outer diameter of the connecting section 3 gradually increases in the direction away from the tool head 2, and the outer diameter of the large end of the connecting section 3 is the same as the diameter D2 of the tool shank 1.

[0062] Here, the outer diameter of the connecting section 3 gradually increases in the axial direction away from the tool head 2, and the outer diameter of the large end of the connecting section 3 is consistent with the diameter D2 of the tool shank 1, achieving the effect of gradual change of the outer diameter, so that the stress can be more evenly distributed on the tool shank 1, reducing the risk of fracture of the tool shank 1, and also facilitating the improvement of connection stability and the improvement of the structure strength of the tool.

[0063] In the specific structure, the outer diameter of the small end of the connecting section 3 is the same as the diameter of the tail of the tool head 2 (i.e. the diameter D1 of the core), and the tool head 2, the connecting section 3 and the tool shank 1 can be connected by welding. Of course, in addition to welding, other common connection forms can also be used, or the tool head 2, the connecting section 3 and the tool shank 1 can be integrally formed. It should be noted that the head of the tool head 2 refers to the end of the tool head 2 away from the connecting section 3, and the tail of the tool head 2 refers to the end of the tool head close to the connecting section 3.

[0064] In addition, in the embodiment, as a preferred implementation form, the tool head 2 has a core, and the ratio of the diameter D1 of the core to the diameter D2 of the tool shank 1 is between 0.6 and 0.7. Here, by limiting the proportional relationship between the diameter D1 of the core and the diameter D2 of the tool shank 1, the natural frequency of the tool can be optimized, thereby avoiding resonance phenomenon in the milling process, and making the tool more stable in the milling process.

[0065] In specific implementation, the ratio of the diameter D1 of the core to the diameter D2 of the tool shank 1 can be set to 0.67, i.e. the diameter D2 of the tool shank 1 can be set to 6mm, and the diameter D1 of the core can be set to 4mm. Of course, the diameter D2 of the tool shank 1 and the diameter D1 of the core can also be designed and adjusted according to actual needs, as long as the ratio of the diameter D1 of the core to the diameter D2 of the tool shank 1 is between 0.6 and 0.7.

[0066] Meanwhile, the ratio of the length L1 of the tool head 2 to the total length L of the tool head 2 and the tool handle 1 is between 0.2 and 0.25. Thus, the structural strength of the tool is improved, the service life of the tool is prolonged, the milling precision is improved, the quality of the product is ensured, the structure is reasonable, and the design is facilitated.

[0067] In the specific structure, the ratio of the length L1 of the tool head 2 to the total length L of the tool head 2 and the tool handle 1 can be set to 0.21, that is, the length L1 of the tool head 2 is set to 15 mm, and the total length of the tool head 2 and the tool handle 1 is set to 70 mm. At this time, the length L2 of the connecting section 3 is 3 mm, and the length L3 of the tool handle 1 is 52 mm.

[0068] The length L1 of the tool head 2, the length L3 of the tool handle 1, and the length L2 of the connecting section 3 can be designed and adjusted according to actual requirements, as long as the ratio of the length L1 of the tool head 2 to the total length L of the tool head 2 and the tool handle 1 is between 0.2 and 0.25.

[0069] The sealing groove milling cutter of the embodiment can better fix the sealing ring after milling, thereby improving the sealing effect of the workpiece, and the spiral angles are equally divided, so that the change rules of the cutting thickness and the cutting width of each cutting edge 21 are the same, the cutting force does not suddenly fluctuate in the cutting process, thereby facilitating the reduction of the roughness of the machined surface, and further facilitating the improvement of the machining precision.

[0070] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealed groove milling cutter, characterized in that: comprising a shank (1), and a head (2) coaxially arranged on the shank (1), the head (2) is provided with a plurality of cutting edges (21) arranged at a circumferential interval along the head (2), the plurality of cutting edges (21) are helical and have a consistent rotation direction, and the cutting portion (211) of each cutting edge (21) is inclined inward relative to the axis of the head (2) from one end of the cutting portion (211) away from the end of the cutting edge (21), forming a swallowtail shape. The included angle between each cutting edge (21) and the axis of the head (2) is a helix angle, and each adjacent helix angle is equally divided. 2.The sealed groove milling cutter according to claim 1, characterized in that: The angle of each helix angle is between 24.98° and 25.02°. 3.The sealed groove milling cutter according to claim 1, characterized in that: The inclination angle of each cutting portion (211) is between 34.99° and 35.01°. 4.The sealed groove milling cutter according to claim 3, characterized in that: Each end of the cutting edge (21) is provided with a corresponding end edge (212), the connection between each end edge (212) and the corresponding cutting portion (211) is a rounded corner structure, and the radius R of the rounded corner is between 2.485mm and 2.515mm. 5.The sealed groove milling cutter according to claim 1, characterized in that: Each side of the cutting edge (21) is provided with a peripheral edge (213), and the first clearance angle of each peripheral edge (213) is 13°, and the second clearance angle of each peripheral edge (213) is 26°. 6.The sealed groove milling cutter according to claim 4, characterized in that: The rake angle of each end edge (212) is 2°; and / or, The first clearance angle of each end edge (212) is 8°, and the second clearance angle of each end edge (212) is 16°. 7.The sealed groove milling cutter according to claim 1, characterized in that: A chip groove (4) is formed between two adjacent cutting edges (21). 8.The sealed groove milling cutter according to claim 1, characterized in that: The tail of the head (2) is provided with a connecting section (3), and the connecting section (3) is used to connect the shank (1) ; The connecting section (3) is in the shape of a circular truncated cone, and the outer diameter of the connecting section (3) gradually increases away from the head (2), and the outer diameter of the large end of the connecting section (3) is the same as the diameter of the shank (1). 9.The sealed groove milling cutter according to claim 8, characterized in that: The ratio of the diameter of the core of the head (2) to the diameter of the shank (1) is between 0.6 and 0.7; and / or, The ratio of the length of the head (2) to the total length of the head (2) and the shank (1) is between 0.2 and 0.

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