Round nose milling cutter

Abstract

The utility model discloses a round nose milling cutter, and relates to the field of workpiece machining. The round nose milling cutter comprises a cutter handle and a cutter head which are coaxially connected, the cutter head comprises a plurality of blades spirally extending in the axial direction of the cutter handle, a cutter groove is formed between every two adjacent blades, the end, away from the cutter handle, of each blade is provided with a blade tip, a chip removal groove is formed between every two adjacent blade tips, and the depth of the chip removal groove is larger than that of the cutter groove. According to the round nose milling cutter, the chip removal grooves are used for assisting the cutter grooves in chip removal, the fluency of chip removal is guaranteed, and the chip removal efficiency is improved; meanwhile, the groove depth of the chip groove is larger than that of the cutter groove, so that the chip groove can contain and discharge more chips, accumulation of the chips at the edge point is avoided, and the milling quality and the milling efficiency of the round nose milling cutter are improved.

Description

Technical Field

[0001] The present application relates to the field of workpiece processing, and in particular to a round nose milling cutter. Background Art

[0002] A milling cutter is a rotating tool with one or more teeth used for milling. When working, each tooth cuts off the excess of the workpiece intermittently in sequence, and a round nose milling cutter refers to a milling cutter whose length of the arc part is greater than 1 / 4 of a circle. A round nose milling cutter is a commonly used mechanical cutting tool, mainly used to mill the end face, bevel or groove and other related parts of a mechanical workpiece. It includes a shank and a cutter head. The cutter head includes multiple spirally arranged blades, and spiral grooves are formed between adjacent blades. The shank is driven by the machine tool to rotate, and the shank drives the cutter head to rotate and mill the workpiece surface through multiple spiral blades. The chips after milling are discharged through the grooves.

[0003] However, since the round nose milling cutter mainly mills the workpiece surface through the tip of the blade end, the amount of debris generated by the cutting tip is much greater than the amount of debris generated by other parts of the blade. At the same time, since the cutter groove is spiral, after the round nose milling cutter is used for a long time, a large amount of debris will accumulate in the cutter groove at the tip and cannot be discharged in time, affecting the subsequent milling quality and milling efficiency. If the machine is stopped to clean the debris, it will undoubtedly affect the overall processing efficiency of the workpiece. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the present application provides a round nose milling cutter with smooth chip removal.

[0005] The round nose milling cutter provided in this application adopts the following technical solution:

[0006] A round nose milling cutter comprises a tool handle and a tool head which are coaxially connected. The tool head comprises a plurality of blades which extend spirally along the axial direction of the tool handle, a tool groove is formed between two adjacent blades, the blade has a blade tip at one end away from the tool handle, a chip groove is provided between two adjacent blade tips, and the groove depth of the chip groove is greater than the groove depth of the tool groove.

[0007] By adopting the above technical solution, the chip groove is used to assist the tool groove for chip removal, which ensures the smoothness of chip removal and improves the chip removal efficiency; at the same time, since the groove depth of the chip groove is greater than the groove depth of the tool groove, the chip groove can accommodate and discharge more debris, avoiding the accumulation of debris at the cutting edge, and improving the milling quality and milling efficiency of the round nose milling cutter.

[0008] In a specific implementation scheme, the plurality of chip grooves correspond one-to-one to the plurality of tool grooves, each chip groove is respectively opened at an end of the corresponding tool groove away from the tool handle, and the groove width of the chip groove is smaller than the groove width of the tool groove.

[0009] By adopting the above technical solution, excessive chips in the chip groove can enter the tool groove from both sides thereof, thereby effectively avoiding the accumulation of chips in the chip groove.

[0010] In a specific possible implementation scheme, a center portion is coaxially arranged at one axial end of the cutter head, the multiple chip grooves are circumferentially spaced around the center portion, and one end of each chip groove away from the cutter groove is connected to the center portion.

[0011] By adopting the above technical solution, the debris generated by multiple cutting edges can be evenly dispersed toward the periphery of the cutter head through multiple chip removal grooves and discharged outward through the cutter grooves, further avoiding the accumulation of debris at the cutting edge.

[0012] In a specific possible implementation manner, the chip removal groove is located between the corresponding tool groove and the central portion, and the chip removal groove extends obliquely from the tool groove toward the central portion.

[0013] By adopting the above technical solution, the chips formed on the axial end face of the cutter head can escape through the inclined chip removal groove into the tool groove formed on the radial side of the cutter head, effectively avoiding the axial end face of the cutter head from being affected in its milling ability due to the accumulation of chips.

[0014] In a specific possible implementation manner, the chip groove has a first groove wall, and the tool groove has a second groove wall, and the first groove wall and the second groove wall are arranged at an angle greater than 90°.

[0015] By adopting the above technical solution, when the chips in the chip groove escape from the first groove wall to the second groove wall, a part of them enters the tool groove along the second groove wall, and the other part escapes outward directly along the extension direction of the first groove wall under the action of inertia, thereby further improving the chip removal efficiency of the chip groove.

[0016] In a specific possible implementation manner, the radial cross-section of the chip groove is V-shaped, the first groove wall includes two wall bodies arranged in a V-shape, and the angles between the two wall bodies and the second groove wall are both greater than 90°.

[0017] By adopting the above technical solution, the two V-shaped walls can gather the debris in the chip groove, avoiding the debris from escaping directly before reaching the tool groove, and facilitating the collection and cleaning of the debris.

[0018] In a specific possible implementation manner, a chip removal surface is provided between the cutting edge and at least one adjacent chip removal groove, and the chip removal surface is provided at an angle to the adjacent first groove wall, and the angle is greater than 90°.

[0019] By adopting the above technical solution, when there are too many chips in the chip removal groove, the excess chips can be discharged through the chip removal surface on the side of the first groove wall, effectively avoiding the accumulation of chips in the chip removal groove.

[0020] In a specific possible implementation scheme, the cutting tip includes a first pointed body located at the axial end of the cutting head and connected to the central portion, a second pointed body located at the radial side of the cutting head and connected to the cutting edge, and the chip removal surface is formed between the first pointed body and the chip removal groove.

[0021] By adopting the above technical solution, when there are too many chips in the chip groove, the excess chips can be discharged through the chip discharge surface between the first pointed body and the chip groove, thereby effectively avoiding the accumulation of chips in the chip groove.

[0022] In a specific possible implementation manner, the blade tip further includes a protection segment with two ends respectively connected to the first pointed body and the second pointed body, and the protection segment is arc-shaped.

[0023] By adopting the above technical solution, when the cutting edge mills the end face of the workpiece, the arc-shaped protection section can protect the first pointed body and the second pointed body, thereby preventing the cutting edge from being worn and broken due to continuous contact between its side and the workpiece, thereby increasing the service life of the cutting edge.

[0024] In a specific possible implementation manner, the first pointed body, the protective segment and the second pointed body are integrally formed.

[0025] By adopting the above technical solution, the connection strength between the first pointed body, the protective section and the second pointed body is effectively improved, and the protective effect of the protective section on the blade tip is improved.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] The round nose milling cutter of the present application utilizes the chip groove to assist the tool groove for chip removal, thereby ensuring the smoothness of chip removal and improving the chip removal efficiency; at the same time, since the groove depth of the chip groove is greater than the groove depth of the tool groove, the chip groove can accommodate and discharge more debris, avoiding the accumulation of debris at the cutting edge, thereby improving the milling quality and milling efficiency of the round nose milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a round nose milling cutter according to an embodiment of the present application.

[0029] Figure 2 yes Figure 1 Right view of .

[0030] Explanation of the reference numerals: 1. tool handle; 2. tool head; 21. blade; 22. tool groove; 23. blade tip; 231. first pointed body; 232. second pointed body; 233. protection section; 24. chip groove; 25. center portion; 26. chip surface. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings.

[0032] See also Figure 1-2 As shown, a round nose milling cutter is shown, comprising a coaxially connected shank 1 and a cutter head 2, the cutter head 2 comprising a plurality of cutting edges 21 extending in a spiral along the axial direction of the shank 1, a cutting groove 22 being formed between two adjacent cutting edges 21, the cutting edge 21 having a cutting tip 23 at one end away from the shank 1, a chip groove 24 being provided between two adjacent cutting tips 23, and the groove depth of the chip groove 24 being greater than the groove depth of the cutting groove 22.

[0033] By setting the chip groove 24, the chip groove 24 is used to assist the tool groove 22 in chip removal, thereby ensuring the smoothness of chip removal and improving the chip removal efficiency; at the same time, since the groove depth of the chip groove 24 is greater than the groove depth of the tool groove 22, the chip groove 24 can accommodate and discharge more debris, avoiding the accumulation of debris at the cutting edge 23, and improving the milling quality and milling efficiency of the round nose milling cutter.

[0034] In this embodiment, the plurality of chip grooves 24 correspond to the plurality of tool grooves 22 one by one, and each chip groove 24 is respectively opened at one end of the corresponding tool groove 22 away from the tool handle 1, and the groove width of the chip groove 24 is smaller than the groove width of the tool groove 22. Excessive debris in the chip groove 24 can enter the tool groove 22 from both sides thereof, effectively avoiding the accumulation of debris in the chip groove 24.

[0035] Further, combined with Figure 2 As shown, a central portion 25 is coaxially arranged at one axial end of the cutter head 2, and a plurality of chip removal grooves 24 are arranged at intervals around the central portion 25 in the circumferential direction, and one end of each chip removal groove 24 away from the cutter groove 22 is connected to the central portion 25, wherein the chip removal groove 24 is located between the corresponding cutter groove 22 and the central portion 25 and the chip removal groove 24 extends obliquely from the cutter groove 22 toward the central portion 25. The chips generated by the plurality of cutting edges 23 can be uniformly dispersed toward the peripheral side of the cutter head 2 through the plurality of chip removal grooves 24, and discharged outward through the cutter groove 22, further avoiding the accumulation of chips at the cutting edge 23; at the same time, the chips formed on the axial end face of the cutter head 2 can be dispersed to the cutter groove 22 formed on the radial side face of the cutter head 2 through the inclined chip removal groove 24, effectively avoiding the influence of the milling ability of the axial end face of the cutter head 2 on the accumulation of chips.

[0036] In this embodiment, the radial cross-section of the chip groove 24 is V-shaped, and has a first groove wall, which includes two wall bodies arranged in a V shape. The tool groove 22 has a second groove wall, and the first groove wall and the second groove wall are arranged at an angle, and the angles between the two wall bodies and the second groove wall are both greater than 90°.

[0037] Through the above-mentioned arrangement, when the debris in the chip groove 24 escapes from the first groove wall to the second groove wall, a part of it enters the knife groove 22 along the second groove wall, and the other part escapes outward directly along the extension direction of the first groove wall under the action of inertia, thereby further improving the chip removal efficiency of the chip groove 24; at the same time, the two V-shaped walls can gather the debris in the chip groove 24, avoiding the direct escape of the debris before reaching the knife groove 22, thereby facilitating the collection and cleaning of the debris.

[0038] In this embodiment, a chip removal surface 26 is provided between the blade tip 23 and at least one adjacent chip removal groove 24, and the chip removal surface 26 is provided at an angle with the adjacent first groove wall and the angle is greater than 90 degrees. When there are too many chips in the chip removal groove 24, the excess chips can be discharged through the chip removal surface 26 on the side of the first groove wall, effectively avoiding the accumulation of chips in the chip removal groove 24.

[0039] Furthermore, the cutting edge 23 includes a first pointed body 231 located at the axial end of the cutting head 2 and connected to the central portion 25 , and a second pointed body 232 located at the radial side of the cutting head 2 and connected to the cutting edge 21 . A chip removal surface 26 is formed between the first pointed body 231 and the chip removal groove 24 .

[0040] The blade tip 23 further includes a protection section 233 connected to the first tip 231 and the second tip 232 at both ends. The protection section 233 is arc-shaped. The first tip 231, the protection section 233 and the second tip 232 are integrally formed.

[0041] When the blade tip 23 mills the end face of the workpiece, the arc-shaped protection section 233 can protect the first pointed body 231 and the second pointed body 232 to prevent the blade tip 23 from being worn and broken due to continuous contact between its side and the workpiece, thereby increasing the service life of the blade tip 23.

[0042] In this embodiment, there are four cutting edges 21 , and correspondingly, there are four cutting grooves 22 and four chip removal grooves 24 .

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A round nose milling cutter, comprising a coaxially connected shank (1) and a cutter head (2), wherein the cutter head (2) comprises a plurality of cutting edges (21) extending spirally along the axial direction of the shank (1), and a cutting groove (22) is formed between two adjacent cutting edges (21), characterized in that: The blade (21) has a blade tip (23) at one end away from the blade handle (1), and a chip removal groove (24) is provided between two adjacent blade tips (23), wherein the depth of the chip removal groove (24) is greater than the depth of the blade groove (22); A center portion (25) is coaxially arranged at one axial end of the cutter head (2), and the plurality of chip removal grooves (24) are arranged at circumferential intervals around the center portion (25), and one end of each chip removal groove (24) away from the cutter groove (22) is connected to the center portion (25).

2. A round nose milling cutter according to claim 1, characterized in that: The plurality of chip removal grooves (24) correspond one to one with the plurality of tool grooves (22), and each of the chip removal grooves (24) is respectively arranged at one end of the corresponding tool groove (22) away from the tool handle (1), and the groove width of the chip removal groove (24) is smaller than the groove width of the tool groove (22).

3. A round nose milling cutter according to claim 1, characterized in that: The chip removal groove (24) is located between the corresponding tool groove (22) and the central portion (25), and the chip removal groove (24) extends obliquely from the tool groove (22) toward the central portion (25).

4. A round nose milling cutter according to claim 1, characterized in that: The chip removal groove (24) has a first groove wall, and the tool groove (22) has a second groove wall. The first groove wall and the second groove wall are arranged at an angle, and the angle is greater than 90 degrees.

5. A round nose milling cutter according to claim 4, characterized in that: The radial cross section of the chip removal groove (24) is V-shaped, the first groove wall comprises two wall bodies arranged in a V-shape, and the angles between the two wall bodies and the second groove wall are both greater than 90°.

6. A round nose milling cutter according to claim 4, characterized in that: A chip removal surface (26) is provided between the cutting edge (23) and at least one adjacent chip removal groove (24), and the chip removal surface (26) is provided at an angle with the adjacent first groove wall, and the angle is greater than 90°.

7. A round nose milling cutter according to claim 6, characterized in that: The cutting edge (23) comprises a first pointed body (231) located at the axial end of the cutting head (2) and connected to the central portion (25), and a second pointed body (232) located at the radial side of the cutting head (2) and connected to the cutting edge (21), and the chip removal surface (26) is formed between the first pointed body (231) and the chip removal groove (24).

8. A round nose milling cutter according to claim 7, characterized in that: The blade tip (23) further comprises a protection section (233) with two ends respectively connected to the first tip body (231) and the second tip body (232), and the protection section (233) is arc-shaped.

9. A round nose milling cutter according to claim 8, characterized in that: The first pointed body (231), the protective section (233) and the second pointed body (232) are integrally formed.

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