A cutting tool

Abstract

The present invention provides a cutting tool, which relates to the technical field of finishing tools and includes a shank and a cutting head located at one end of the shank. The cutting head includes a cutting edge portion, and the cutting edge portion includes a bottom edge, a side edge, and an R corner connecting the bottom edge and the side edge. A part of the R corner is located at the end of the end where the bottom edge is located and is connected to the bottom edge to form a part of the bottom edge, and a part is located at the side of the side where the side edge is located and is connected to the side edge to form a part of the side edge. A grinding method for a cutting tool provided by the present invention includes the following steps: continuously and uninterruptedly grinding the bottom edge, the R corner, and the side edge with a grinding wheel until the grinding work is completed. In the present invention, whether machining the bottom surface, the R corner, or the side surface, the cutting tool is always in a point contact state with the machining surface, and the machining load is always uniform. At the same time, the cutting tool production process is updated to ensure that there are no seams or steps on the machining surface, thereby obtaining a super-high-quality machining surface.

Description

Technical Field

[0001] The present invention relates to the technical field of finishing tools, and particularly relates to a cutting tool. Background Art

[0002] In recent years, customers' requirements for the appearance quality of products (injection molded parts) have increased sharply, which is equivalent to the increased requirements for the quality of molds. In the processing of 3D-shaped molds, ball nose end mills and corner radius end mills are usually used. The tip of the ball nose end mill wears quickly, the quality of the machined surface is poor, and the service life is short. When the corner radius end mill processes the side wall, as the machining depth increases, the load in the side cutting edge direction increases, resulting in unstable load from the side cutting edge direction, easy chatter, and poor quality of the machined surface. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a cutting tool.

[0004] A cutting tool provided by the present invention includes: a shank portion and a cutter head located at one end of the shank portion. The cutter head includes a plurality of cutting edges that are rotationally symmetric about the axis of the shank portion. The cutting edge includes a bottom edge at the end, a side edge at the side, and an R corner connecting the bottom edge and the side edge. A part of the R corner is located at the end of the bottom edge and is connected to the bottom edge to form a part of the bottom edge, and a part is located at the side of the side edge and is connected to the side edge to form a part of the side edge.

[0005] Preferably, the central angle θ of the R corner is greater than 90° so that the connecting portion of the R corner and the bottom edge extends into the end of the bottom edge to form a part of the bottom edge, and the connecting portion of the R corner and the side edge extends into the side of the side edge to form a part of the side edge.

[0006] Preferably, the angle of the cutting angle α of the bottom edge is greater than 10°.

[0007] Preferably, the angle of the flank angle β of the side edge is greater than 10°.

[0008] A grinding method for a cutting tool provided by the present invention includes the following steps: continuously and uninterruptedly grinding the bottom edge, the R corner, and the side edge with a grinding wheel until the grinding work is completed.

[0009] Preferably, the grinding wheel continuously grinds in sequence from the bottom edge, the R corner, and the side edge direction without interruption until the grinding work is completed.

[0010] Preferably, the grinding wheel continuously grinds in sequence from the side edge, the R corner, and the bottom edge direction without interruption until the grinding work is completed.

[0011] A cutting tool proposed by the present invention, a part of the R corner is located at the end of the end where the bottom edge is located and is connected to the bottom edge to form a part of the bottom edge, and a part is located at the side of the side where the side edge is located and is connected to the side edge to form a part of the side edge. Such a design enables the cutting tool to always maintain a point contact state with the machining surface when machining the workpiece, whether it is machining the bottom surface or machining the R bottom corner and the side surface. During the entire machining process, the machining load remains uniform, achieving a high-quality machining surface. A grinding method for a cutting tool proposed by the present invention uses a grinding wheel to continuously and uninterruptedly grind the bottom edge, the R corner, and the side edge until the grinding work is completed (i.e., integrated grinding), thereby producing an integrated cutting edge, ensuring that there are no seams or steps on the machining surface, and thus obtaining an ultra-high-quality machining surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of a cutting tool proposed by the present invention.

[0013] Figure 2 It is an enlarged view of the tool head in a cutting tool proposed by the present invention.

[0014] Figure 3 It is a schematic diagram of the working principle of a cutting tool proposed by the present invention.

[0015] Figure 4 It is a schematic diagram of the working route of the grinding wheel in a grinding method for a cutting tool proposed by the present invention Figure 1 .

[0016] Figure 5 It is a schematic diagram of the working route of the grinding wheel in a grinding method for a cutting tool proposed by the present invention Figure 2 . DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0018] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0020] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0021] Referring to Figure 1 , a cutting tool proposed by the present invention includes: a shank 1 and a tool head 2 located at one end of the shank 1. The tool head 2 includes a plurality of cutting edges that are rotationally symmetric about the axis of the shank 1. The cutting edges include a bottom edge 21 at the end, a side edge 22 at the side, and an R corner 23 connecting the bottom edge 21 and the side edge 22. The angle of the cutting angle α of the bottom edge 21 is greater than 10°, and the angle of the clearance angle β of the side edge 22 is greater than 10°. The large cutting angle α can reduce the load during planar machining. At the same time, the large angles of the cutting angle α of the bottom edge and the clearance angle β of the side edge both being greater than 10° can maintain good chip evacuation performance.

[0022] Referring to Figure 2 , a part of the R corner 23 (such as Figure 2 H1 in Figure 2 ) is located at the end of the end where the bottom edge 21 is located and is connected to the bottom edge 21 to form a part of the bottom edge 21. A part (such as

[0023] Referring to Figure 3, when machining a workpiece, whether machining the bottom surface or the R-bottom corner and the side surface, the tool always maintains a point contact state with the machining surface, and the machining load remains uniform throughout the machining process, achieving a high-quality machining surface.

[0024] Referring to Figures 4 - 5 , a grinding method for a tool proposed by the present invention includes the following steps: continuously and uninterruptedly grinding the bottom edge 21, the R corner 23, and the side edge 22 with a grinding wheel 3 until the grinding work is completed to produce an integrated cutting edge, preventing seams or steps from existing between the side edge 22, the R corner 23, and the bottom edge 21 in the tool due to the precision error of the grinding wheel 3 used in different processes, the difference in grinding directions, and the influence of manual operations, which may further lead to problems such as seams, steps, and color differences on the machining surface.

[0025] Specifically: the grinding wheel 3 continuously and uninterruptedly grinds in the order of the bottom edge 21, the R corner 23, and the side edge 22 until the grinding work is completed; or the grinding wheel 3 continuously and uninterruptedly grinds in the order of the side edge 22, the R corner 23, and the bottom edge 21 until the grinding work is completed.

[0026] As can be seen from the above, a grinding method for a tool proposed by the present invention continuously and uninterruptedly grinds the bottom edge 21, the R corner 23, and the side edge 22 with a grinding wheel 3 until the grinding work is completed (i.e., integrated grinding), thereby producing an integrated cutting edge, ensuring that there are no seams or steps on the machining surface, and thus obtaining an ultra-high-quality machining surface.

[0027] As can be seen from the above, the present invention always maintains a point contact state between the tool and the machining surface whether machining the bottom surface, the R corner, or the side surface. That is, the machining load is always uniform. At the same time, the tool production process is updated to ensure that there are no seams or steps on the machining surface, thereby obtaining an ultra-high-quality machining surface.

[0028] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A cutting tool, characterized in that, Comprising: A handle portion (1) and a cutter head portion (2) located at one end of the handle portion (1). The cutter head portion (2) includes a plurality of cutting edge portions rotationally symmetric about the axis of the handle portion (1). The cutting edge portion includes a bottom edge (21) at the end, a side edge (22) at the side, and an R corner (23) connecting the bottom edge (21) and the side edge (22). A part of the R corner (23) is located at the end of the end where the bottom edge (21) is located and is connected to the bottom edge (21) to form a part of the bottom edge (21), and a part is located at the side of the side where the side edge (22) is located and is connected to the side edge (22) to form a part of the side edge (22). The central angle θ of the R corner (23) is greater than 90° so that the connecting portion of the R corner (23) connected to the bottom edge (21) extends into the end of the end where the bottom edge (21) is located to form a part of the bottom edge (21), and the connecting portion of the R corner (23) connected to the side edge (22) extends into the side of the side where the side edge (22) is located to form a part of the side edge (22).

2. The cutting tool according to claim 1, characterized in that, The angle of the cutting angle α of the bottom edge (21) is greater than 10°.

3. The cutting tool according to claim 1, wherein The angle of the clearance angle β of the side edge (22) is greater than 10°.

4. A grinding method for a cutting tool, applied to the cutting tool according to any one of claims 1-3, characterized in that, Including the following steps: Using a grinding wheel (3) to continuously and uninterruptedly grind the bottom edge (21), the R corner (23), and the side edge (22) until the grinding work is completed.

5. The grinding method of the cutting tool according to claim 4, characterized in that, The grinding wheel (3) continuously grinds in sequence from the direction of the bottom edge (21), the R corner (23), and the side edge (22) until the grinding work is completed.

6. The grinding method of the cutting tool according to claim 4, characterized in that, The grinding wheel (3) continuously grinds in sequence from the direction of the side edge (22), the R corner (23), and the bottom edge (21) until the grinding work is completed.

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