Numerical control machining combined tool and numerical control machining equipment

Abstract

The utility model belongs to numerical control processing technical field discloses a numerical control processing combined tool and numerical control processing equipment, including handle and tool bit subassembly, wherein tool bit subassembly installs in the working end of handle, tool bit subassembly includes tool bit body and sets up a plurality of processing cutting edges on tool bit body, and a plurality of processing cutting edges include edge correction blade, rough milling blade, up and down chamfer blade, fine milling blade and dovetail reverse chamfer blade from top to bottom along handle axial in proper order, this numerical control processing combined tool and numerical control processing equipment not only avoided the positioning error and workpiece damage caused by frequent replacement of tool, improved the stability and continuity of processing process, reduced artificial intervention, also effectively reduced the processing difficulty and manufacturing cost of subsequent rework, polishing and other procedures, effectively inhibited burr, corner and misplacement defects, improved processing precision and corner quality, especially suitable for high appearance precision requirement shell type part's large batch automation processing.

Description

Technical Field

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

[0002] With the rapid development of the smartphone industry, consumers are placing higher demands on the lightweight structure and refined appearance of the entire device. Composite materials, with their characteristics of light weight and high strength, can provide superior mechanical properties within the same structural dimensions, while effectively reducing the weight and thickness of the product, gradually becoming an ideal choice for casing materials.

[0003] However, as a complex functional component, the three-dimensional mobile phone casing presents a significantly increased processing difficulty compared to traditional planar composite materials. On the one hand, the three-dimensional structure of mobile phone casings often involves complex geometries such as multiple curved surfaces, thin walls, and multi-angle chamfers, requiring multiple tool changes to process different parts of the casing. This process is complex, inefficient, and prone to damaging the surface of the casing during tool changes. On the other hand, the hardness and brittleness of the high-strength fibers in composite materials can lead to unstable casing cutting dimensions, surface burrs, and edge chipping during processing. This necessitates repeated processing, further exacerbating tool wear, reducing tool life, and significantly impacting product yield.

[0004] Therefore, there is an urgent need for a combination of CNC machining tools and CNC machining equipment to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a CNC machining combination tool and CNC machining equipment, which improves the feasibility and stability of the machining process, reduces the damage to the appearance of the machined shell caused by frequent tool changes, thereby improving the product yield, increasing processing efficiency, and effectively reducing the processing difficulty and cost of subsequent processes for mobile phone shells.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A CNC machining combination tool, comprising:

[0008] Handle;

[0009] A cutting head assembly is installed at the working end of the tool holder. The cutting head assembly includes a cutting head body and a plurality of machining cutting edges disposed on the cutting head body. The plurality of machining cutting edges include, from top to bottom, an edge correction cutting edge, a rough milling cutting edge, an upper and lower chamfering cutting edge, a finish milling cutting edge, and a dovetail reverse chamfering cutting edge along the axial direction of the tool holder.

[0010] The edge correction blade is located at the top of the cutter head body and is used for high-precision trimming of the workpiece edge. The roughing blade is located below the edge correction blade and is used for rough machining of the workpiece contour. The upper and lower chamfering blades are located below the roughing blade and are arranged at an angle to trim the workpiece corners. The finishing blade is located below the upper and lower chamfering blades and is used for finishing the contour. The dovetail chamfering blade is located at the bottom of the cutter head body, and the dovetail chamfering blade contour protrudes from the cutter head body for machining special structural corners.

[0011] The dovetail chamfering edge is made of polycrystalline diamond, and the edge correction edge is made of monocrystalline diamond.

[0012] Furthermore, the diameter of the cutter head body is smaller than the diameter of the cutter handle.

[0013] Furthermore, the rough milling cutter, the upper and lower chamfering cutters, the fine milling cutter, and the dovetail reverse chamfering cutter are integrally formed.

[0014] Furthermore, the edge correction blade is welded to the top of the cutter head body and is inclined from bottom to top, with its cutting edge line extending axially upward toward the cutter head body; the edge correction blade and the roughing blade are arranged at intervals.

[0015] Furthermore, the upper and lower chamfering edges include an upper chamfering edge and a lower chamfering edge. The upper chamfering edge is inclined downward from above, and its cutting edge line extends axially downward toward the cutter head body. The lower chamfering edge is inclined upward from below, and its cutting edge line extends axially upward toward the cutter head body. The outer edges of both the upper and lower chamfering edges protrude from the radial contour of the cutter head body.

[0016] Furthermore, the included angle formed by the cutting edge line of the upper chamfering edge and the cutting edge line of the lower chamfering edge is less than 90°.

[0017] Furthermore, the dovetail chamfering edge is inclined downward from top to bottom, and its cutting edge line extends axially downward toward the cutter head body, and the angle between the cutting edge line of the dovetail chamfering edge and the axial direction of the cutter head body is greater than 90°.

[0018] Furthermore, the bottom of the dovetail chamfered edge is on the same horizontal plane as the bottom surface of the cutter head body, and the angle between the cutting edge line of the dovetail chamfered edge and the bottom surface of the cutter head body is less than 90°.

[0019] Furthermore, the tool holder is cylindrical; and / or,

[0020] The handle is made of tungsten carbide and high-carbon steel.

[0021] A CNC machining equipment includes a drive motor, a spindle, and a CNC machining combination tool as described in any of the above. The tool holder is clamped on the spindle, and the output end of the drive motor is connected to the spindle to control the rotational speed, feed rate, and depth of cut of the spindle driving the tool holder.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a CNC machining combination tool and CNC machining equipment, including a tool holder and a tool head assembly. The tool head assembly is installed at the working end of the tool holder and includes a tool head body and multiple machining cutting edges disposed on the tool head body. The multiple machining cutting edges include, from top to bottom, an edge correction cutting edge, a rough milling cutting edge, an upper and lower chamfering cutting edge, a finish milling cutting edge, and a dovetail reverse chamfering cutting edge along the axial direction of the tool holder. This CNC machining combination tool not only avoids positioning errors and workpiece damage caused by frequent tool changes, but also improves the stability and continuity of the machining process and reduces human intervention. It also effectively reduces the processing difficulty and manufacturing cost of subsequent rework, grinding, and other processes, effectively suppresses burrs, chipping, and misalignment defects, and improves machining accuracy and edge quality. It is suitable for mass automated machining of shell-type parts with high appearance precision requirements. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the CNC machining combination tool in this utility model;

[0025] Figure 2 This is a schematic diagram of the CNC machining combination tool used in this utility model to process a workpiece.

[0026] In the picture:

[0027] 100. Workpiece;

[0028] 1. Tool holder; 2. Tool head body; 3. Edge correction edge; 4. Rough milling edge; 5. Upper and lower chamfering edges; 51. Upper chamfering edge; 52. Lower chamfering edge; 6. Finish milling edge; 7. Dovetail reverse chamfering edge. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly 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 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 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.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] Please refer to Figures 1 to 2 As shown, this embodiment provides a CNC machining combination tool, including a tool holder 1 and a tool head assembly. The tool head assembly is mounted on the working end of the tool holder 1. The tool head assembly includes a tool head body 2 and multiple machining edges disposed on the tool head body 2. The multiple machining edges, arranged from top to bottom along the axial direction of the tool holder 1, include an edge correction edge 3, a rough milling edge 4, upper and lower chamfering edges 5, a finish milling edge 6, and a dovetail reverse chamfering edge 7. The edge correction edge 3 is located at the top of the tool head body 2 and is used for high-precision machining of the edge of the workpiece 100. The roughing cutter 4 is located below the edge correction cutter 3 and is used for rough machining of the workpiece 100 contour. The upper and lower chamfering cutters 5 are located below the roughing cutter 4 and are arranged at an angle to finish the corners of the workpiece 100. The finishing cutter 6 is located below the upper and lower chamfering cutters 5 and is used for finishing the contour. The dovetail chamfering cutter 7 is located at the bottom of the cutter body 2 and its contour protrudes from the cutter body 2. It is used to process corners with special structures. The dovetail chamfering cutter 7 is made of polycrystalline diamond, and the edge correction cutter 3 is made of monocrystalline diamond.

[0034] This CNC machining combination tool integrates multiple machining edges onto a single tool head, arranged sequentially along the axial direction of the tool holder 1. It can sequentially complete rough milling, finish milling, chamfering, special reverse chamfering, and trimming in a single setup, avoiding positioning errors and workpiece damage caused by frequent tool changes, thus improving the stability and continuity of the machining process. The dovetail reverse chamfering edge 7 at the bottom provides machining guidance, ensuring that subsequent edges cut with a good reference point. Each edge has a clear function and a reasonable arrangement, resulting in a smooth and controllable machining path. The upper and lower chamfering edges 5, the finish milling edge 6, and the trimming edge work together to effectively suppress burrs, chipping, and misalignment defects, improving machining accuracy and edge quality. In particular, the upper and lower chamfering edges 5 and the dovetail reverse chamfering edge 7 have a clear structure and direction, making them suitable for stable machining of complex edge contours, resulting in more regular workpiece shape and better appearance quality, thereby improving product yield. In addition, the edge correction blade 3 is made of monocrystalline diamond, which has high surface finish and excellent dimensional retention, making it suitable for high-precision finishing; the dovetail chamfering blade 7 is made of polycrystalline diamond, which has strong wear resistance and long service life, making it suitable for long-term processing of hard and brittle composite materials.

[0035] Overall, this CNC machining combination tool not only improves machining efficiency and consistency and reduces human intervention, but also effectively reduces the difficulty and manufacturing cost of subsequent rework, grinding and other processes. It is suitable for mass automated machining of shell-type parts with high appearance precision requirements.

[0036] Specifically, the tool holder 1 is cylindrical, which facilitates high-precision concentricity control between the tool holder 1 and the spindle, ensuring that the axis of the tool holder 1 is consistent with the axis of the spindle and reducing eccentricity and runout.

[0037] Among them, the tool holder 1 is made of tungsten steel and high carbon steel. Tungsten steel and high carbon steel have high hardness, high wear resistance and high temperature resistance. They are suitable for keeping the tool holder 1 from deforming in high-speed, heavy cutting and high rigidity requirements, effectively improving the overall rigidity and life of the tool.

[0038] Specifically, the diameter of the cutter head body 2 is smaller than that of the cutter shank 1. The cutter head body 2 is thinner, which makes it easier to penetrate into narrow, deep grooves, narrow cavities, thin-walled areas, etc. It is suitable for processing complex geometric structures such as mobile phone shells, mold grooves, and insert corners, improving the adaptability and local processing capability of the cutter head body 2. In addition, the cutting part is lighter and has less inertia, effectively reducing tool self-excited vibration and chatter during the cutting process, and improving the surface finish of the workpiece 100.

[0039] In some optional embodiments, the roughing cutter 4, the upper and lower chamfering cutters 5, the finishing cutter 6, and the dovetail chamfering cutter 7 are integrally formed. Each machining cutter and the cutter head body 2 are integral structures without assembly gaps or connecting parts, ensuring continuous cutting force transmission, high overall bending rigidity, and good vibration resistance. In addition, the relative angles, relative heights, and axial positions of each machining cutter are directly guaranteed by the designed mold, effectively avoiding deviation errors or cumulative errors caused by multi-segment welding / assembly. When multiple machining cutters work together, their cutting trajectories are more consistent, the contours are naturally and continuously connected, and vibration and tool skipping phenomena are suppressed, making it suitable for high-speed and high-precision scenarios.

[0040] Furthermore, the edge correction blade 3 is welded to the top of the cutter head body 2 and is inclined from bottom to top, with its cutting edge line extending upward in the direction of the cutter head body 2 axis; the edge correction blade 3 and the rough milling blade 4 are arranged at intervals; since the single crystal diamond edge correction blade 3 is usually expensive and difficult to process, it is not suitable to be integrally formed with other processing blades; the welding installation method can achieve precise arrangement, quick assembly, and flexible replacement, and facilitates independent replacement of the correction blade according to the wear condition. The edge correction blade 3 is inclined from bottom to top and its cutting line is inclined upward along the axial direction, so that its cutting direction forms a reverse cutting edge, that is, it lightly cuts from the inside of the edge of the workpiece 100 outward, which is conducive to producing a high-smooth edge contour. The edge correction blade 3 and the rough milling blade 4 are arranged at intervals to avoid mutual interference. Since the edge correction blade and the rough milling blade 4 have completely different functions: one is light cutting with high precision, and the other is a large cutting amount. If they are too close, the strong vibration during the rough milling process may affect the positioning and cutting edge stability of the edge correction blade 3. By setting the space interval, the cutting paths of the two are staggered and the action stages are staggered, so that they do not interfere with each other, improving the overall stability of the tool and ensuring that each cutting edge works in the optimal cutting zone.

[0041] In some embodiments, the upper and lower chamfering edges 5 include an upper chamfering edge 51 and a lower chamfering edge 52. The upper chamfering edge 51 is inclined downward from above, and its cutting edge line extends axially downward toward the tool head body 2. The lower chamfering edge 52 is inclined upward from below, and its cutting edge line extends axially upward toward the tool head body 2. The outer edges of both the upper chamfering edge 51 and the lower chamfering edge 52 protrude from the radial contour of the tool head body 2. The upper chamfering edge 51 is beneficial for trimming the outer bevel or top chamfer of the upper edge of the workpiece 100. The lower chamfering edge 52 is beneficial for trimming the inner bevel or bottom chamfer of the lower edge of the workpiece 100. Through bidirectional chamfering, the chamfering treatment of the upper and lower edges can be completed simultaneously, avoiding missed processing and rework. In addition, the chips from the upper chamfering edge 51 are discharged downward, and the chips from the lower chamfering edge 52 are discharged upward. The chip discharge directions are complementary and the cutting processes do not interfere with each other, which helps to maintain a clean cutting area in high-speed cutting and reduce problems such as surface scratches and burr residue caused by chip accumulation. The outer edges of the upper and lower chamfering edges 5 protrude beyond the contour of the cutter head body 2. The protruding structure means that its cutting path extends beyond the outer contour of the axis of the cutter head body 2, ensuring that the cutting edge can completely cover the edge of the workpiece 100 during processing, without being blocked or interfered by other parts of the cutter head. This results in beautiful processing lines and improves the edge and corner resistance and the smoothness of assembly transition.

[0042] Furthermore, the angle formed by the cutting edge line of the upper chamfering edge 51 and the cutting edge line of the lower chamfering edge 52 is less than 90°; this is beneficial for machining a chamfer structure with clearer lines and sharper edges, thereby enhancing the three-dimensionality and precision of the workpiece's 100° corner contour.

[0043] In some embodiments, the dovetail chamfering blade 7 is inclined downward from above, with its cutting edge extending axially downward toward the cutter head body 2, and the angle between the cutting edge of the dovetail chamfering blade 7 and the axial direction of the cutter head body 2 is greater than 90°. When the angle is greater than 90°, the dovetail chamfering blade 7 forms a strong cutting angle with reverse oblique entry, which can be used to perform reverse chamfering on the inner hole edge, effectively removing burrs and fuzz from the hole opening, optimizing the transition effect of the inner hole edge, improving assembly smoothness and reliability, and effectively making up for the blind area of ​​the cutting direction that the upper and lower chamfering blades 5 cannot complete.

[0044] Specifically, the bottom of the dovetail chamfering edge 7 is on the same horizontal plane as the bottom surface of the cutter body 2, and the angle between the cutting edge line of the dovetail chamfering edge 7 and the bottom surface of the cutter body 2 is less than 90°. When the bottom of the cutting edge is coplanar with the bottom surface of the cutter, it means that the cutting depth of the edge is consistent with the bottom end of the tool. During the machining process, the tool is axially positioned to the bottom, which completes the dovetail chamfering. There is no need to control the tool feed depth, making the machining depth easy to control and the error small. The chamfering of the bottom corner of the workpiece is not affected by the feed depth, which is conducive to high consistency forming. In addition, the angle between the cutting edge line and the bottom surface is less than 90°, which makes it form an inward dovetail slope structure. The cutting path is inclined from the outside to the inside, forming an internal clamping slope, which can process complex contours such as dovetail grooves, negative slope steps, and slope locking edges. The processed slope can realize functions such as reverse snap-fit, structural self-locking, and anti-loosening connection. It avoids the formation of outward chamfers, improves the connection firmness and structural enclosure.

[0045] Specifically, the bottom of the dovetail chamfering edge 7 is on the same horizontal plane as the bottom surface of the cutter body 2, and the angle between its cutting edge line and the bottom surface of the cutter body 2 is less than 90°. Since the bottom of the cutting edge of the dovetail chamfering edge 7 is coplanar with the bottom surface of the cutter body 2, it means that the cutting depth of the dovetail chamfering edge 7 is flush with the bottom of the tool. During the machining process, it is only necessary to position the tool axially to the bottom to complete the dovetail chamfering operation, without the need to control the depth of cut separately. This simplifies the control logic, improves machining accuracy, and significantly reduces positioning errors. Secondly, the chamfering depth of the workpiece's 100° bottom corner is not affected by feed rate fluctuations. The slight difference in the moving or tool path affects the consistency of the corner shape and the high repeatability of the machining. In addition, the angle between the cutting edge line of the dovetail reverse chamfering edge 7 and the bottom surface of the tool head is less than 90°, which can form an inwardly contracting reverse bevel structure. Its cutting path is distributed with an outward and inward slope, which is suitable for machining complex inward contours such as dovetail grooves, negative slope steps, and reverse bevel locking edges. The formed bevel structure has good internal clamping and covering characteristics, which is conducive to realizing functions such as reverse snap-fit, structural self-locking or anti-loosening connection, avoiding structural loosening caused by outward chamfering, and further improving the firmness of the connection part and the overall structure's wrapping.

[0046] This embodiment also discloses a CNC machining equipment, including a drive motor, a spindle, a worktable, and a CNC machining combination tool as described in any of the above embodiments. The tool holder 1 is clamped on the spindle, and the workpiece 100 is clamped on the worktable. The output end of the drive motor is connected to the spindle to control the rotational speed, feed rate, and depth of cut of the spindle driving the tool holder 1.

[0047] The machining steps of CNC machining equipment are as follows:

[0048] First, clamp workpiece 100 onto the machining table, ensuring accurate positioning and secure clamping to prevent displacement or loosening during machining. During clamping, care should be taken to avoid excessive clamping force to prevent deformation or surface damage to workpiece 100. This is especially important when machining parts requiring high precision or high aesthetics; in such cases, use padded fixtures or clamping methods with protective pads to protect the surface quality of workpiece 100.

[0049] Subsequently, based on the material hardness of workpiece 100 and the performance parameters of each functional cutting edge of the combined tool, reasonable machining parameters are set. The spindle speed is generally set within the range of 40,000–50,000 r / min to ensure good cutting capability of the cutting edge while avoiding overheating or premature wear due to excessive speed. The feed rate is set according to different machining processes. For contour machining, the feed rate is set to 2000–3500 mm / min, while for chamfering, it is appropriately reduced to 1500–2500 mm / min to balance cutting efficiency and surface quality. Regarding the depth of cut, it is recommended that the depth of cut in a single pass not exceed 0.5 mm for contour machining, and control the depth of cut between 0.05 and 0.25 mm for chamfering to obtain a smoother chamfer profile.

[0050] Next, start the drive motor and begin the processing flow:

[0051] S1: Rough and finish machining of the outer shape. The rough milling cutter 4 and the finish milling cutter 6 of the CNC machining combination tool act on the workpiece 100 in sequence. According to the preset machining trajectory, the outline of the workpiece 100 is rough machined and finished to complete the overall shape.

[0052] S2: Outer contour chamfering. The upper and lower chamfering blades 5 are used to chamfer the outer contour edge of the workpiece 100 to form the required chamfer structure, thereby improving the integrity of the edge lines and the appearance quality.

[0053] S3: Internal hole machining. Switch to the internal hole machining path. The precision milling cutter 6 in the CNC machining combination tool will cut the specified internal hole part to ensure the internal hole dimensional accuracy and roundness requirements.

[0054] S4: Inner hole chamfering. The dovetail chamfering blade 7 is used to chamfer the inner hole edge in the reverse direction, effectively removing burrs and hairs from the hole opening, optimizing the transition effect of the inner hole edge, and improving assembly smoothness and reliability.

[0055] S5: Edge trimming and polishing. Using the edge correction blade 3 located at the top of the combination tool, the inner hole edge that needs to achieve a high gloss effect is trimmed to achieve a high gloss finish and improve the consistency and texture of the product appearance.

[0056] After numerous comparative tests, CNC machining equipment equipped with a combination of CNC machining tools has demonstrated significant advantages over traditional machining methods. Traditional methods require three tool changes, while this equipment can complete all processes in a single setup, reducing tool change time by approximately 60% to 70% and greatly improving machining efficiency. Regarding machining accuracy, traditional processes have a dimensional error of approximately ±0.03mm, while this equipment controls it within ±0.01mm, an improvement of approximately 200%. Workpiece surface quality is significantly improved; traditional machining results in burrs and uneven chamfering, while this equipment achieves a surface roughness of Ra≤2.0μm, producing consistent chamfers and increasing the yield rate from 85% to 95%. In terms of tool life, traditional single tools have a lifespan of approximately 200 pieces, while this combination tool set achieves or exceeds 400 pieces, an extension of approximately 100%, effectively reducing maintenance costs. Furthermore, the cost of subsequent processes accounts for approximately 30% of the cost in traditional machining, while this equipment reduces subsequent costs to below 10%, resulting in an overall cost reduction of approximately 40% to 50%.

[0057] Therefore, CNC machining equipment equipped with CNC machining combination tools can complete multiple precision machining tasks of workpiece 100 in a single clamping and single machining process, effectively reducing tool changes and repetitive positioning operations of workpiece 100, significantly improving machining efficiency and consistency, enhancing the stability and continuity of the machining process, reducing human intervention, effectively suppressing burrs, chipping and misalignment defects, improving machining accuracy and edge quality, and is suitable for mass automated machining of shell-type parts with high appearance precision requirements.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A CNC machining modular tool, characterized by, include: Handle (1); The tool head assembly is installed at the working end of the tool holder (1). The tool head assembly includes a tool head body (2) and a plurality of machining cutting edges disposed on the tool head body (2). The plurality of machining cutting edges include, from top to bottom, an edge correction cutting edge (3), a rough milling cutting edge (4), an upper and lower chamfering cutting edge (5), a finish milling cutting edge (6), and a dovetail reverse chamfering cutting edge (7) along the axial direction of the tool holder (1). Among them, the edge correction blade (3) is located at the top of the cutter head body (2) and is used to perform high-precision trimming on the edge of the workpiece (100); the rough milling blade (4) is located below the edge correction blade (3) and is used to rough machine the contour of the workpiece (100); the upper and lower chamfering blades (5) are located below the rough milling blade (4) and are arranged at an angle to trim the corners of the workpiece (100); the finish milling blade (6) is located below the upper and lower chamfering blades (5) and is used to finish machine the contour; the dovetail chamfering blade (7) is located at the bottom of the cutter head body (2) and the contour of the dovetail chamfering blade (7) protrudes from the cutter head body (2) and is used to process special structural corners; The dovetail chamfering edge (7) is made of polycrystalline diamond, and the edge correction edge (3) is made of monocrystalline diamond.

2. The gang tool according to claim 1, wherein The diameter of the blade body (2) is smaller than the diameter of the handle (1).

3. The gang tool according to claim 1, wherein The rough milling cutter (4), the upper and lower chamfering cutters (5), the fine milling cutter (6) and the dovetail chamfering cutter (7) are integrally formed.

4. The gang tool according to claim 3, wherein The edge correction blade (3) is welded to the top of the cutter head body (2) and is inclined from the bottom upward, with its cutting edge line extending upward in the direction of the cutter head body (2); the edge correction blade (3) and the rough milling blade (4) are arranged at intervals.

5. The gang tool according to claim 1, wherein The upper and lower chamfering edges (5) include an upper chamfering edge (51) and a lower chamfering edge (52). The upper chamfering edge (51) is inclined downward from above, and its cutting edge line extends axially downward toward the cutter head body (2). The lower chamfering edge (52) is inclined upward from below, and its cutting edge line extends axially upward toward the cutter head body (2). The outer edges of both the upper chamfering edge (51) and the lower chamfering edge (52) protrude from the radial contour of the cutter head body (2).

6. The gang tool according to claim 5, wherein The angle formed by the cutting edge line of the upper chamfering edge (51) and the cutting edge line of the lower chamfering edge (52) is less than 90°.

7. The combination knife of claim 1, wherein, The dovetail chamfering edge (7) is inclined downward from above, and its cutting edge line extends axially downward toward the cutter head body (2), and the angle between the cutting edge line of the dovetail chamfering edge (7) and the axial direction of the cutter head body (2) is greater than 90°.

8. The gang tool according to claim 1, wherein The bottom of the dovetail chamfering edge (7) is on the same horizontal plane as the bottom surface of the cutter head body (2), and the angle between the cutting edge line of the dovetail chamfering edge (7) and the bottom surface of the cutter head body (2) is less than 90°.

9. The gang tool according to any one of claims 1-8, characterized in that The knife handle (1) is cylindrical; and / or, The handle (1) is made of tungsten steel and high carbon steel.

10. Numerically controlled machining apparatus, characterized by, The tool includes a drive motor, a spindle, a worktable, and a CNC machining combination tool as described in any one of claims 1-9. The tool holder (1) is clamped on the spindle, the workpiece (100) is clamped on the worktable, and the output end of the drive motor is connected to the spindle to control the rotational speed, feed rate, and depth of cut of the spindle driving the tool holder (1).

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