Numerical control cutter for high-precision machining

Abstract

The utility model discloses a numerical control cutter for high accuracy processing, including the handle of integrated formation and the cutter body, the cutter body periphery is alternately equipped with the chip flute and the wedge groove along the axial direction, and forms the star type end face at the end, and a plurality of end cutter teeth are fixedly installed on the star type end face. The spin line cutter strip is embedded and installed in each wedge groove, and the one end of spin line cutter strip is equipped with the mounting hole with end cutter tooth, and is fixed through the screw rod independently. The wedge groove and spin line cutter strip adopt the inclined plane cooperation structure, realize radial and axial double surface positioning, spin line cutter strip extends along the periphery helical, and the cutting edge of its outer edge and the cutting edge of end cutter tooth form continuous cutting edge line on the end face, thereby realize seamless transition of end face and side surface cutting. The structure guarantees the precision stability of cutter under the condition of thermal expansion, and also is convenient for the detachable replacement of cutter strip and end tooth, reduces the maintenance cost, cooperates with the arc chip flute, the mounting hole inserts the screw rod and the wear -resisting coating design, and further promotes the chip removal efficiency, cutter durability and cutting stability.

Description

Technical Field

[0001] This utility model relates to the field of CNC cutting tool technology, specifically a high-precision CNC cutting tool. Background Technology

[0002] Currently, CNC milling cutters are widely used in high-precision fields such as mold manufacturing, precision parts machining, and aerospace. Common CNC cutters mainly fall into two categories: one is solid carbide end mills, which offer high overall strength and stable precision, but once their cutting edges wear down, they require complete resharpening or scrapping, resulting in high replacement costs and long downtime. The other category is indexable insert cutters, which allow for cutting edge replacement by mounting individual inserts on the cutter body. While this improves maintenance efficiency to some extent, the inserts are typically single-piece, making it difficult to achieve a completely continuous cutting line between the end and side cutting edges. This leads to step marks in the transition area between the end face and side face during cutting, resulting in poor surface finish and dimensional consistency.

[0003] Furthermore, in existing integral or assembled cutting tools, the end teeth and side cutting edges are often fixed to the tool body through integral machining or rigid fitting. When the tool body rotates at high speed and undergoes thermal expansion due to heat during cutting, the assembly accuracy of the end teeth and side cutting edges is easily affected, resulting in slight displacement or deformation. This leads to increased tool runout and decreased machining accuracy. This problem of accuracy degradation caused by thermal expansion is particularly prominent when machining parts with high surface finish or high dimensional requirements.

[0004] Therefore, there is an urgent need for a high-precision CNC tool that can independently assemble and disassemble the spiral cutter bar and end cutter teeth, and form a continuous cutting edge line on the end face and side, in order to solve the problems of inconvenient maintenance, precision degradation caused by thermal expansion, and discontinuous cutting transition in the existing technology. Utility Model Content

[0005] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted by this utility model is as follows: a high-precision CNC cutting tool, comprising an integrally formed tool holder and tool body; the outer periphery of the tool body is provided with several axially extending chip removal grooves and wedge grooves, which are alternately distributed on the outer periphery of the tool body; a star-shaped end face is formed at the end of the tool body, and several end teeth are fixedly installed on the star-shaped end face; a spiral cutting tool is embedded in each wedge groove, and one end of the spiral cutting tool and the surface of the end teeth are provided with mounting holes and fixed by threaded screws. This structure not only realizes the detachable replacement of the spiral cutting tool and the end teeth, but also ensures the continuity of the cutting edge lines of the end face and the side face, thereby improving the cutting stability and machining accuracy of the tool.

[0007] In a preferred embodiment, the inner walls on both sides of the wedge groove are respectively provided with opposing inclined surfaces, and the base of the rotary cutting tool is provided with wedge-shaped bosses on both sides that cooperate with the inclined surfaces, thereby achieving dual-sided positioning in both radial and axial directions during assembly. With this structure, the rotary cutting tool will not loosen or shift under cutting loads, effectively ensuring the positioning accuracy and long-term stability of the tool.

[0008] In a preferred example, the spiral cutter extends spirally along the outer periphery of the cutter body, and its outer cutting edge and the cutting edge of the end teeth form a continuous cutting edge line on the end face of the cutter body. This continuous cutting edge line makes the cutting transition between the end face and the side face smoother, avoiding the step marks present in traditional assembly cutters, thereby significantly improving the surface finish and dimensional consistency of the workpiece.

[0009] In a preferred embodiment, the end teeth are arranged in a multi-tooth star shape, with the outer edge of each end tooth transitioning to the outer edge of the adjacent spiral cutter bar. This arrangement enhances the stability of the tool during end-face cutting, improving the uniformity of the machined surface while ensuring cutting efficiency.

[0010] In a preferred example, the chip removal groove is machined into an arc-shaped groove structure and arranged adjacent to the inner side of the spiral cutting tool. This design can form a spiral chip removal channel during tool cutting, allowing chips to be smoothly discharged, thereby avoiding chip clogging, adhesion, and heat generation, and further improving the cooling efficiency and service life of the tool.

[0011] In a preferred embodiment, the screws are respectively disposed at both ends of the spiral cutting tool, and the heads of the screws are embedded in the mounting holes of the spiral cutting tool or end teeth. This design avoids the screws being exposed, prevents chips from accumulating at the screw location, ensures smooth chip removal, and makes the outer surface of the tool more compact.

[0012] In a preferred embodiment, the spiral cutting tool may be made of solid cemented carbide or coated high-speed steel, and its outer surface may be coated with a wear-resistant coating such as TiAlN, AlTiN, or DLC. This choice of material and coating not only enhances the tool's wear resistance and oxidation resistance but also extends its service life and reduces the costs associated with frequent tool replacements.

[0013] In a preferred embodiment, the cutting edge of the end teeth is provided with a micro-radius or chip breaker of 0.02–0.05 mm. This design can effectively reduce stress concentration on the cutting edge, prevent chipping during cutting, improve chip breakage and removal, and enhance the cutting stability of the tool.

[0014] In a preferred example, the tool holder can be made as a straight shank or a tapered shank structure to match the clamping interfaces of different machine tool spindles, thus having strong versatility and adaptability.

[0015] In a preferred example, a scale reference is provided on the star-shaped end face of the cutter body to facilitate precision adjustment after the spiral cutter bar and end cutter teeth are installed. This facilitates inspection and adjustment after the spiral cutter bar and end cutter teeth are installed, thereby further improving assembly accuracy and dimensional control capability in tool processing.

[0016] The beneficial effects achieved by this utility model are as follows: 1. In this utility model, by designing the rotary cutting tool bar and the end cutting teeth as a detachable and replaceable structure and using screws for independent assembly and fixation, it is not only convenient for quick maintenance of the tool after wear, but also avoids the overall tool's precision deterioration caused by thermal expansion, thereby maintaining long-term stable machining accuracy.

[0017] 2. In this utility model, the outer edge cutting edge of the spiral cutter bar and the cutting edge of the end cutter teeth form a continuous cutting edge line on the end face of the cutter body, realizing a seamless transition between end face and side face cutting, and greatly improving the surface finish and dimensional consistency of the workpiece. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is an exploded structural diagram of one embodiment of the present invention; Figure 3 This is a schematic diagram of a partial end face structure of the blade body according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the spiral cutting blade and end teeth structure according to an embodiment of the present invention.

[0019] Figure label: 1. Handle; 2. Tool body; 3. Spiral cutting tool; 4. End cutting teeth; 5. Screw; 21. Chip removal groove; 22. Wedge groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0021] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0022] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a high-precision CNC cutting tool.

[0023] Combination Figures 1-4As shown, this utility model provides a high-precision CNC machining tool, including a tool holder 1 and a tool body 2, which are integrally formed. The outer circumference of the tool body 2 is provided with several chip removal grooves 21 and wedge grooves 22 along the axial direction. The chip removal grooves 21 and wedge grooves 22 are alternately distributed, so that the entire tool body 2 is evenly distributed with structural units for chip removal and installation in the circumferential direction. A star-shaped end face is formed at the end of the tool body 2, and several end teeth 4 are installed on the star-shaped end face. A spiral cutting tool 3 is embedded in each wedge groove 22. One end of the spiral cutting tool 3 and the surface of the end teeth 4 are provided with mounting holes, and screws 5 are inserted to fasten the spiral cutting tool 3 and the end teeth 4.

[0024] Furthermore, such as Figure 2 As shown, the inner walls of the two sides of the wedge groove 22 are respectively machined with opposing inclined surfaces, and the base of the spiral cutting tool 3 is provided with corresponding wedge-shaped bosses on both sides. The wedge-shaped bosses fit into the inclined surfaces in the wedge groove 22. Through this structure, the spiral cutting tool 3 can achieve stable positioning in both the radial and axial directions, thereby ensuring that the spiral cutting tool 3 will not loosen or shift due to force during the cutting process, thus improving the cutting stability and accuracy of the tool.

[0025] In a preferred embodiment, the spiral cutter bar 3 extends spirally along the outer periphery of the cutter body 2, and its cutting edge forms a continuous spiral line. When the spiral cutter bar 3 is assembled into the wedge groove 22, its outer edge cutting edge and the cutting edge of the end cutter tooth 4 naturally connect at the end face of the cutter body 2, thereby forming a continuous cutting edge line on the end face of the cutter body 2. This structure ensures a smooth transition of the cutting edge line between end milling and side milling, avoiding problems such as cutting steps or uneven surfaces.

[0026] like Figure 3 As shown, the end cutter teeth 4 are arranged in a multi-tooth star shape. The outer edge of each end cutter tooth 4 is transitionally connected to the outer edge of the adjacent spiral cutter bar 3, forming a continuous star-shaped end-cutting structure. This structure not only improves the stability of the tool during end milling, but also improves the surface finish during cutting.

[0027] like Figure 1 As shown, the chip removal groove 21 is integrally machined into an arc-shaped groove structure and is arranged adjacent to the inner side of the adjacent spiral cutting tool 3. The arc-shaped chip removal groove 21 and the spiral cutting tool 3 form a chip removal channel extending in a spiral direction. When the tool rotates and cuts, the chips can be smoothly discharged along the chip removal channel, avoiding the problems of chip blockage and tool overheating.

[0028] Furthermore, such as Figure 4As shown, screws 5 are respectively located at both ends of the rotary cutting tool 3. Each screw 5 is fastened to the rotary cutting tool 3 and the end cutting teeth 4 through corresponding mounting holes. The head of the screw 5 is embedded in the mounting hole of the rotary cutting tool 3 or the end cutting teeth 4, so that the screw 5 is not exposed on the tool surface, thereby avoiding chip accumulation at the screw position and ensuring smooth chip removal.

[0029] In one embodiment, the spiral cutting tool 3 can be made of solid cemented carbide or coated high-speed steel. Its outer surface is covered with a wear-resistant coating of TiAlN, AlTiN, or DLC to enhance the wear resistance and oxidation resistance of the tool, thereby extending the tool's service life.

[0030] Furthermore, the cutting edge of the end cutter tooth 4 can be machined with a micro-radius of 0.02 to 0.05 mm, or a micro-chip breaker structure can be provided at the cutting edge. The micro-radius can effectively reduce stress concentration at the cutting edge and prevent chipping; the chip breaker structure can achieve effective chip breaking, improve chip control, and prevent chips from wrapping around the workpiece surface.

[0031] like Figure 1 As shown, the tool holder 1 can be manufactured as a straight shank or a tapered shank to adapt to the spindle clamping interfaces of different machine tools. This design enhances the compatibility between the tool and the machine tool, and can be widely used in different types of CNC milling equipment.

[0032] In one improved design, the star-shaped end face of the cutter body 2 can also be provided with a scale reference for positioning and detection, so as to perform accuracy adjustment after installing the spiral cutter bar 3 and the end cutter teeth 4. This scale reference allows for detection and adjustment after installing the spiral cutter bar 3 and the end cutter teeth 4, thereby further improving the assembly accuracy and machining stability of the tool.

[0033] In summary, this utility model achieves high-precision positioning and reliable fastening of the cutting tool by incorporating a chip removal groove 21, a wedge groove 22, a spiral cutting edge 3, end teeth 4, and a screw 5. The design of the star-shaped end face and spiral chip removal channel ensures continuous cutting between the end and side edges, improving the smoothness and finish of the machined surface. Furthermore, the use of wear-resistant coating materials and micro-rounded corner structures effectively enhances the tool's durability and cutting stability. This CNC cutting tool is particularly suitable for high-precision milling applications such as mold manufacturing and precision parts machining.

[0034] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. 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.

[0035] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-precision CNC cutting tool, characterized in that, include: The tool holder (1) and the tool body (2) are integrally formed; the outer periphery of the tool body (2) is provided with a number of chip removal grooves (21) and wedge grooves (22) extending along the axial direction; the chip removal grooves (21) and wedge grooves (22) are alternately distributed along the outer periphery of the tool body (2) and form a star-shaped end face at the end of the tool body (2); a number of end teeth (4) are fixedly installed on the surface of the star-shaped end face; a spiral blade (3) is embedded in each of the wedge grooves (22); one end of the spiral blade (3) and the surface of the end teeth (4) are provided with mounting holes and threaded rods (5) are inserted through them.

2. The CNC cutting tool according to claim 1, characterized in that: The inner walls on both sides of the wedge groove (22) are respectively provided with opposing inclined surfaces, and the base of the spiral blade (3) is provided with wedge-shaped protrusions on both sides that cooperate with the inclined surfaces, thereby realizing the radial and axial double-sided positioning of the spiral blade (3).

3. The CNC cutting tool according to claim 1 or 2, characterized in that: The spiral blade (3) extends spirally along the outer periphery of the blade body (2), and its outer edge cutting edge and the cutting edge of the end blade tooth (4) form a continuous cutting edge line at the end face of the blade body (2).

4. The CNC cutting tool according to claim 1, characterized in that: The end cutter teeth (4) are arranged in a multi-tooth star shape, and the outer edge of each end cutter tooth (4) is connected to the outer edge of the adjacent spiral cutter bar (3).

5. The CNC cutting tool according to claim 1, characterized in that: The chip removal groove (21) is an arc-shaped groove structure and is arranged adjacent to the inner side of the spiral blade (3), thereby forming a chip removal channel extending in the spiral direction.

6. The CNC cutting tool according to claim 1, characterized in that: The screws (5) are respectively located at both ends of the spiral blade (3), and the head of the screws (5) is embedded in the mounting hole of the spiral blade (3) or the end blade (4).

7. The CNC cutting tool according to claim 1, characterized in that: The spiral blade (3) is made of solid cemented carbide or coated high-speed steel, and its outer surface is covered with one of TiAlN, AlTiN or DLC wear-resistant coating.

8. The CNC cutting tool according to claim 1, characterized in that: The cutting edge of the end cutter tooth (4) is provided with a micro-rounded corner or chip breaking platform of 0.02 to 0.05 mm to enhance the anti-chipping performance and improve chip control.

9. The CNC cutting tool according to claim 1, characterized in that: The tool holder (1) is a straight shank or tapered shank structure and can be used in conjunction with the clamping interface of the machine tool spindle.

10. The CNC cutting tool according to claim 1, characterized in that: The star-shaped end face of the blade body (2) is provided with a scale reference for positioning detection so that the accuracy can be adjusted after the spiral blade (3) and the end blade teeth (4) are installed.

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