A manufacturing method of an internal cyclone milling cutter head and its milling cutter blades

Abstract

The present invention provides a manufacturing method for an internal cyclone milling cutter head and its milling inserts, which includes a fixed seat. A disk body is detachably installed on the fixed seat. A first processing hole for the workpiece to pass through is provided at the central axis of the fixed seat. A second processing hole is provided on the disk body. A plurality of blade grooves for installing the milling inserts are arranged on the disk body along the circumferential direction of the second processing hole. The milling inserts are fixed in the blade grooves through fixing bolts. A pressing groove is communicated with the side wall of the blade groove, and a pressing component for pressing the milling inserts is arranged in the pressing groove. An adjusting bolt is eccentrically arranged at the bottom of the blade groove. An adjusting hole matched with the adjusting bolt is arranged on the fixed seat. The adjusting bolt penetrates through the fixed seat and is threadedly connected with the disk body through the adjusting hole. The eccentric direction of the adjusting bolt is consistent with the radial adjusting direction of the milling inserts. Through the eccentric structure of the adjusting bolt, quantitative control of the radial displacement of the milling inserts is realized, and the adjustment accuracy is high. At the same time, the pressing component presses the milling inserts, realizing the replacement of milling inserts of various specifications and wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and particularly relates to an internal whirling cutter head and a manufacturing method of a milling cutter blade thereof. Background Art

[0002] The cutting process is mainly divided into turning, drilling, milling, boring and grinding according to the processing type; turning refers to using the rotational movement of the workpiece and the linear or curvilinear movement of the cutting tool to change the shape and size of the blank; drilling refers to the process of using a cutting tool to machine holes in the workpiece; milling refers to fixing the blank and using a rotating multi-edge cutting tool to feed on the blank to cut out the required shape and size of the workpiece; boring is a cutting process of using a cutting tool to enlarge a hole or other circular contour; grinding refers to a processing method of removing excess material on the workpiece with abrasives, belonging to the finishing process of machining; threaded connection is a widely used detachable fixed connection, which has the advantages of simple structure, reliable connection, convenient assembly and disassembly, etc. Thread refers to the continuous raised part with a spiral shape and a specific cross-section made on the surface of a cylindrical or conical matrix. Threads are divided into cylindrical threads and conical threads according to the shape of their matrix; they are divided into external threads and internal threads according to their position in the matrix, and are divided into triangular threads, rectangular threads, trapezoidal threads, serrated threads and other special-shaped threads according to their cross-sectional shape (tooth profile). Traditional thread processing is mainly realized by means of dies, rolling, thread milling, turning, etc., and external threads and screw rods are often processed by turning and rolling. At present, some large-diameter external threads and studs are generally processed by a whirling cutter.

[0003] The existing invention patent CN109365893A discloses a whirling cutter with a self-cooling and lubricating structure, which includes a rotating matrix and a plurality of thread milling cutter blades; a large through-hole is arranged on the rotating matrix along the central axis; a plurality of matrix connecting screw holes are arranged on the rotating matrix along the circumferential direction; a plurality of thread milling cutter blades are installed on one end face of the rotating matrix along the circumferential direction; it also includes a plurality of cooling and lubricating liquid flow channels arranged in the rotating matrix and having the same number as the thread milling cutter blades; the inlet of the cooling and lubricating liquid flow channel is located on the outer circular surface of the rotating matrix and is far from the thread milling cutter blade; the outlet of the cooling and lubricating liquid flow channel is arranged on the inner circular surface of the rotating matrix and is close to the thread milling cutter blade; the outlet of one cooling and lubricating liquid flow channel is opposite to the tip of a thread milling cutter blade; the rotating matrix and the cooling and lubricating liquid flow channels are both processed and formed by 3D printing.

[0004] However, the position of the disclosed structure blade cannot be finely adjusted, resulting in errors between multiple edges during cutter head manufacturing and precision deviation of the blade itself, resulting in a blade height difference in the radial and axial dimensions of the cutting edge after the blade is assembled on the cutter head, thereby causing a seam on the processed part of the product. Summary of the Invention

[0005] The present invention aims to provide a high-precision internal whirling cutter head and a manufacturing method for its milling inserts.

[0006] The present invention provides the following technical solution: An internal whirling cutter head includes a fixed seat, on which a disk body is detachably installed. At the central axis of the fixed seat, there is a first machining hole for the workpiece to pass through. On the disk body, there is a second machining hole coaxially arranged with the first machining hole. Along the circumferential direction of the second machining hole on the disk body, there are several blade grooves for installing milling inserts. The milling inserts are fixed in the blade grooves by fixing bolts. The side wall of the blade groove is connected to a pressing groove, and in the pressing groove, there is a pressing component for pressing the milling insert. At the bottom of the blade groove, an adjusting bolt is eccentrically arranged. On the fixed seat, there is an adjusting hole cooperating with the adjusting bolt. The adjusting bolt passes through the fixed seat and is threadedly connected to the disk body through the adjusting hole. The eccentric direction of the adjusting bolt is consistent with the radial adjusting direction of the milling insert.

[0007] In some embodiments, the radial adjustment amount Δr of the adjusting bolt satisfies the formula: Δr = (P × e) / R, where: Δr is the radial displacement generated by a single rotation of the adjusting bolt; P is the axial moving distance of the adjusting bolt for one full rotation; e is the eccentricity between the axis of the adjusting bolt and the contact surface; R is the acting radius of the adjusting bolt; the ratio range of the eccentricity e to the axial moving distance P is 1:5 to 1:8.

[0008] In some embodiments, the pressing component includes a pressing block. The pressing block moves along a direction perpendicular to the radial adjusting direction of the milling insert. Along its moving direction, the pressing block is provided with a long slotted hole for movement. A pressing bolt is fitted and installed on the long slotted hole for movement, and the pressing bolt is threadedly connected to the fixed seat.

[0009] In some embodiments, a positioning long slot is provided in the blade groove. The length direction of the positioning long slot is perpendicular to the radial adjusting direction of the milling insert. The positioning long slot includes an extending portion and a moving portion. In the moving portion, a positioning nut is movably provided. The positioning nut extends circumferentially outwards with a boss, and the moving portion extends inwards with a pressing plate. The pressing plate is located directly above the pressing plate. The positioning nut cooperates with the fixing bolt, and the fixing bolt passes through the milling insert and is threadedly connected to the positioning nut.

[0010] In some embodiments, a limiting bolt is installed in the extending portion.

[0011] In some embodiments, a tightening bolt is fitted at the bottom of the pressing block. On the disk body, there is a tightening threaded through hole cooperating with the tightening bolt. By rotating the tightening bolt, the tightening bolt presses against the wall surface of the milling insert, thereby pressing the milling insert.

[0012] In some embodiments, by adjusting the radial extending distance of the milling insert, the blade groove is divided into a rough milling groove and a finish milling groove, and the rough milling groove and the finish milling groove are arranged in an alternating pattern.

[0013] In some embodiments, a first positioning hole is provided on the disk body, and a second positioning hole matching the first positioning hole is provided on the fixing seat. The first positioning hole and the second positioning hole are connected by a positioning pin. The first positioning holes extend radially along the disk body and are grouped by the first positioning holes in the same radial direction. Several groups of first positioning holes are circumferentially and evenly distributed around the central axis of the disk body.

[0014] A manufacturing method of an inner cyclone milling cutter disk milling blade, and the manufacturing process of the milling blade is as follows: S1. Preparation of a gradient cemented carbide substrate: The surface mixed powder and the core mixed powder are layered and loaded into a mold, and a cemented carbide substrate with a low cobalt content on the surface and a high cobalt content in the core is formed through a gradient sintering process. The surface mixed powder contains cobalt ≤ 6wt% and a grain inhibitor, and the core mixed powder contains cobalt 8 - 12wt%.

[0015] S2: Cutting edge forming and strengthening. The substrate is processed by five-axis grinding to form an involute cutting edge matching the worm helix angle, and the edge area is subjected to laser micro-melting strengthening treatment to generate a nanocrystalline strengthening layer.

[0016] S3: Deposition of a multi-layer composite coating. A transition layer, a heat insulation layer, and an anti-friction layer containing silicon elements are sequentially deposited on the surface of the substrate by physical vapor deposition technology.

[0017] S4: Function verification. The tool life and machining accuracy are verified through worm cutting tests.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] 1. Innovation of a high-precision radial adjustment mechanism: By fixing the milling blade with fixing bolts, the adjustment bolt directly contacts the milling blade for fine adjustment, and the adjustment is more precise. At the same time, the eccentric adjustment is formulaically controlled. Through the eccentric design of the adjustment bolt, compared with the traditional cutter disk that relies on manual experience for adjustment, this design uses the lever amplification effect to achieve micron-level adjustment, and the adjustment accuracy is increased by more than 50%.

[0020] 2. The double composite clamping mechanism strengthens the tool fixation. The combination of vertical clamping and lateral abutment. The clamping assembly is initially fixed by moving the clamping block in the vertical direction, and then the abutting bolt applies pressure to the side wall of the milling blade to form a two-way clamping force. The contact area is increased by 40% compared with the traditional single-bolt clamping method, and the anti-vibration performance is significantly improved.

[0021] 3. The integrated roughing and finishing slot design. The blade slots are arranged in an alternating pattern of rough milling slots and finish milling slots. During rough machining, high-toughness blades bear a large cutting amount, and during finish machining, high-precision blades complete the surface finishing. The cutting force fluctuation is reduced by more than 30%. By adjusting the radial insertion distance of the blade in the rough milling slot or the finish milling slot, the roughing and finishing mode switching can be achieved without replacing the cutter disk, reducing the downtime by 50%.

[0022] 4. Breakthroughs in gradient materials and composite coating technologies. The low-cobalt surface layer enhances wear resistance, and the high-cobalt core enhances impact resistance. The tool life of the gradient carbide alloy is extended by more than twice compared to homogeneous carbide alloys. A nanocrystalline strengthening layer is generated by laser treatment in the edge region, combined with a TiN / Al2O3 / TiSiN composite coating, reducing the cutting temperature by 20% and the occurrence rate of built-up edge by 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic structural diagram of another angle of the present invention;

[0026] Figure 3 is the Figure 2 magnified schematic structural diagram of part A of the present invention;

[0027] Figure 4 is a schematic sectional view of the present invention;

[0028] Figure 5 is a schematic sectional view of another angle of the present invention;

[0029] Figure 6 is an exploded schematic structural diagram of the present invention;

[0030] Figure 7 is a schematic structural diagram of the disc body of the present invention;

[0031] Figure 8 is a schematic structural diagram of the fixing seat of the present invention;

[0032] Figure 9 is a schematic structural diagram of the cooperation between the fixed mark and the adjustment mark of the present invention;

[0033] Figure 10 is a schematic structural diagram of the milling insert of the present invention;

[0034] Figure 11 is a schematic diagram of the manufacturing process of the milling insert of the present invention.

[0035] In the figure: 1. Fixed seat; 1.1. First processing hole; 1.2. Adjusting hole; 1.3. Second positioning hole; 1.4. Positioning long slot; 1.4.1. Insertion part; 1.4.2. Moving part; 1.4.3. Pressure plate; 2. Disk body; 2.1. Second processing hole; 2.2. Blade slot; 2.2.1. Rough milling slot; 2.2.2. Fine milling slot; 2.2.3. Adjusting scale line; 2.2.4. Positioning surface; 2.3. Compression slot; 2.4. Through hole for abutting bolt; 2.5. First positioning hole; 2.6. Fixed mark; 3. Compression assembly; 3.1. Compression block; 3.2. Moving long oval hole; 3.3. Compression bolt; 3.4. Abutting bolt; 4. Adjusting bolt; 4.1. Adjusting mark; 5. Milling blade; 5.1. Fixed hole; 6. Fixed bolt; 7. Positioning pin; 8. Positioning nut; 8.1. Boss; 9. Limit bolt. Detailed implementation mode

[0036] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The following illustrates the implementation modes of the present application through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0038] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0039] It should also be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present application. The components shown in the illustrations are only those related to the present application, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0040] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the practice can be carried out without these specific details.

[0041] The following describes the technical solutions provided by each embodiment of the present application with reference to the accompanying drawings.

[0042] Please refer to Figures 1-6 As shown, in this embodiment: An internal cyclone milling cutter head includes a fixed seat 1. A disk body 2 is detachably mounted on the fixed seat 1. A first machining hole 1.1 for the workpiece to pass through is provided at the central axis of the fixed seat 1. A second machining hole 2.1 coaxial with the first machining hole 1.1 is provided on the disk body 2. A plurality of blade grooves 2.2 for installing milling blades 5 are formed on the disk body 2 along the circumferential direction of the second machining hole 2.1. The milling blades 5 are fixed in the blade grooves 2.2 by fixing bolts 6. The side wall of the blade groove 2.2 communicates with a pressing groove 2.3. A pressing assembly 3 for pressing the milling blades 5 is provided in the pressing groove 2.3. An adjusting bolt 4 is eccentrically arranged at the bottom of the blade groove 2.2. An adjusting hole 1.2 cooperating with the adjusting bolt 4 is provided on the fixed seat 1. The adjusting bolt 4 passes through the fixed seat 1 and is threadedly connected to the disk body 2 through the adjusting hole 1.2. The eccentric direction of the adjusting bolt 4 is the same as the radial adjustment direction of the milling blade 5.

[0043] It should be noted that: The cutter head adopts a separated structure of the fixed seat 1 and the disk body 2, and quick positioning and installation are achieved through a positioning pin 7. This design facilitates cutter head maintenance and tool replacement, meets the requirements of modern high-efficiency machining, and realizes a modular detachable design.

[0044] In some embodiments, as Figures 4-6 shown, the radial adjustment amount Δr of the adjusting bolt 4 satisfies the formula: Δr = (P × e) / R, where: Δr is the radial displacement amount generated by a single rotation of the adjusting bolt 4; P is the axial moving distance of the adjusting bolt 4 for one full rotation; e is the eccentricity between the axis of the adjusting bolt 4 and the contact surface; R is the acting radius of the adjusting bolt 4; the ratio range of the eccentricity e to the axial moving distance P is 1:5 to 1:8.

[0045] It should be pointed out that: when e:P=1:5, then e=0.05mm, lead P=0.2mm, Δr=0.004mm, R=2.5mm, and the adjusting bolt 4 is adjusted so that the milling blade can be adjusted 50.004mm radially for every rotation of the adjusting bolt 4, and the milling blade 5 can be adjusted 50.001mm radially for a quarter of a turn. The adjusting thread adopts fine thread M3×0.2, and the pitch accuracy must reach ISO:4 level.

[0046] In some embodiments, as Figures 6-10 As shown, the fixing bolt 6 passes through the fixing hole 5 . 1 of the milling insert 5 to fix the milling insert 5 on the fixing seat 1 .

[0047] In some embodiments, as Figures 2-8 As shown, the clamping assembly 3 includes a clamping block 3.1, which moves along a radial adjustment direction perpendicular to the milling blade 5. The clamping block 3.1 is provided with a movable oblong hole 3.2 along its moving direction, and a clamping bolt 3.3 is installed on the movable oblong hole 3.2. The clamping bolt 3.3 is threadedly connected to the fixed seat 1. It should be noted that the clamping block 3.1 realizes elastic pre-tightening in the vertical direction through the movable oblong hole 3.2 to avoid tool movement during high-speed cutting. At the same time, through the movement of the clamping block 3.1, it can adapt to the assembly of milling blades 5 of different specifications.

[0048] In some embodiments, as Figures 2-3 As shown, a positioning long groove 1.4 is provided in the blade slot 2.2, and the length direction of the positioning long groove 1.4 is perpendicular to the radial adjustment direction of the milling blade 5. The positioning long groove 1.4 includes an extending portion 1.4.1 and a moving portion 1.4.2. A positioning nut 8 is movably provided in the moving portion 1.4.2. The positioning nut 8 has a boss 8.1 extending outward in the circumferential direction. A pressure plate 1.4.3 is extended inwardly from the moving portion 1.4.2. The pressure plate 1.4.3 is located directly above the pressure plate 1.4.3. The positioning nut 8 cooperates with the fixing bolt 6 to fix The fixed bolt 6 passes through the milling blade 5 and is threadedly connected to the positioning nut 8. It should be noted that the milling blade 5 is fixed to the positioning nut 8 by the fixing bolt 6. Since the positioning nut 8 can only move perpendicular to the radial adjustment direction of the milling blade 5, the milling blade 5 is further limited to provide the installation accuracy of the milling blade 5. At the same time, the wall distance of the blade groove 2.2 can be adjusted by the positioning nut 8 to realize the installation of milling blades 5 of multiple specifications. The pressure plate 1.4.3 cooperates with the boss 8.1 to prevent the positioning nut 8 from disengaging from the positioning long groove 1.4.

[0049] In some embodiments, as Figure 3As shown, a limit bolt 9 is installed inside the insertion part 1.4.1. It should be noted that the positioning nut 8 moves into the moving part 1.4.2 through the insertion part 1.4.1, and the boss 8.1 of the positioning nut 8 moves under the pressing plate 1.4.3. A limit bolt 9 is provided in the insertion part 1.4.1 to prevent the positioning nut 8 from disengaging from the positioning long groove 1.4 during the assembly of the milling blade 5.

[0050] In some embodiments, as Figure 9 shown, an adjustment mark 4.1 is provided on the upper end surface of the adjustment bolt 4, a fixed mark 2.6 that cooperates with the adjustment mark is provided on the disk body 2, and an adjustment scale line 2.2.3 is provided at the installation position of the adjustment bolt 4 in the blade groove 2.2, which can visually and accurately adjust the radial distance of the milling blade 5.

[0051] In some embodiments, as Figure 5 shown, a tightening bolt 3.4 is provided at the bottom of the pressing block 3.1 in a matching manner, and a tightening threaded through hole that cooperates with the tightening bolt 3.4 is provided on the disk body 2. By rotating the tightening bolt 3.4, the tightening bolt 3.4 presses against the wall surface of the milling blade 5, thereby pressing the milling blade 5. It should be noted that the tightening bolt 3.4 directly acts on the side of the blade to form a rigid support, and cooperates with the pressing bolt 3.3 and the fixing bolt 6 to achieve triple fixation to ensure safety.

[0052] In some embodiments, as Figure 3 shown, the blade groove 2.2 includes a positioning surface 2.2.4. When installing the milling blade 5, the fixing bolt 6 passes through the fixing hole 5.1 of the milling blade 5 and is pre-connected to the positioning nut 8, and the milling blade 5 is pressed against the positioning surface 2.2.4 by the pressing block 3.1 and the tightening bolt 3.4. The connection between the fixing bolt 6 and the positioning nut 8 is pre-tightened again, the radial distance of the milling blade 5 is measured, the adjustment bolt 4 is adjusted until the milling blade 5 reaches the precise position, the fixing bolt 6 is tightened, and the radial distance of the milling blade 5 is measured again until the milling blade 5 reaches the precise position.

[0053] In some embodiments, as Figure 7 shown, by adjusting the radial insertion distance of the milling blade 5, the blade groove 2.2 is divided into a rough milling groove 2.2.1 and a finish milling groove 2.2.2. The rough milling groove 2.2.1 and the finish milling groove 2.2.2 are arranged in an alternating manner. The rough milling groove 2.2.1 and the finish milling groove 2.2.2 are arranged alternately to realize the integration of the processes of rough machining for removing surplus material and finish machining for ensuring accuracy, and the rough and finish machining efficiency is increased by 10 times.

[0054] In some embodiments, as Figures 6-8As shown, the disc body 2 is provided with a first positioning hole 2.5, and the fixing base 1 is provided with a second positioning hole 1.3 that cooperates with the first positioning hole 2.5. The first positioning hole 2.5 and the second positioning hole 1.3 are connected by a positioning pin 7. The first positioning holes 2.5 extend radially along the disc body 2 and are grouped by those in the same radial direction. Several groups of first positioning holes 2.5 are circumferentially evenly distributed around the central axis of the disc body 2, making the positioning of the disc body 2 and the fixing base 1 more accurate and preventing relative movement during operation.

[0055] A manufacturing method of an internal cyclone milling cutter disc milling blade is as Figure 11 shown. The manufacturing process of the milling blade 5 is as follows: S1. Preparation of gradient cemented carbide substrate, powder mixing. Surface layer material: WC powder with a particle size of 0.6 μm, 94.3 wt%, Co powder 5.5 wt%, Cr3C2 powder 0.2 wt%; Core material: WC powder 88 wt%, Co powder 12 wt%.

[0056] Place the two types of powders in planetary ball milling jars respectively, use alcohol as the medium, with a ball-to-material ratio of 5:1, mix for 6 hours and then dry and screen. The screen aperture is 45 μm; Use a lamination mold, and load the surface layer powder with a thickness of 1 mm and the core powder with a thickness of 4 mm in sequence; Apply a pressure of 25 MPa in a vacuum sintering furnace, heat up to 1470 °C at a rate of 10 °C / min, hold for 1.5 hours, and then cool to room temperature at a rate of 5 °C / min; Obtain the substrate hardness: surface layer HRA 93.2, core HRA 91.8, flexural strength 2650 MPa.

[0057] S2. Involute cutting edge machining and strengthening, five-axis grinding, use a diamond grinding wheel with a particle size of D15 to machine the cutting edge, the grinding wheel linear speed is 35 m / s, and the feed rate is 0.02 mm per pass; The helix angle β of the main cutting edge is 15.5°, the clearance angle α of the secondary cutting edge is 8.2°, the edge passivation radius R is 0.04 mm, and the surface roughness Ra is 0.18 μm; Laser micro-melting strengthening, use a fiber laser, wavelength 1070 nm, power 350 W, spot diameter 0.1 mm, scanning speed 900 mm / s; Scan along the edge contour 3 times to form a strengthening layer with a thickness of 0.25 mm, surface residual compressive stress of 820 MPa, and microhardness HV0.3 = 2850.

[0058] S3. Deposition of multi-layer composite coating, pre-treatment, after the substrate is ultrasonically cleaned, it is etched in argon plasma for 10 minutes, bias voltage -1000 V, current 2 A; Coating deposition,

[0059] TiCN transition layer: Target: Ti target (purity 99.99%), reaction gas C2H2 / N2 = 1:3, pressure 3 Pa, bias voltage -150 V, deposition temperature 450 °C, thickness 2.5 μm;

[0060] Al2O3 Thermal Insulation Layer: Target: Al target, reaction gas O2 / Ar = 1:2, pressure 0.5 Pa, RF power 8 kW, deposition temperature 500 °C, thickness 3.8 μm;

[0061] TiSiN Anti-friction Layer: Target: Ti target + Si target (Ti:Si = 4:1), reaction gas N2, pressure 0.3 Pa, DC power Ti target 4 kW / Si target 1 kW, deposition temperature 400 °C, thickness 5.1 μm;

[0062] Total coating thickness 10.5 μm, surface friction coefficient 0.28, test standard ASTM G99.

[0063] S4: Cutting Verification

[0064] Workpiece material: 20CrMnTi carburized and hardened steel (HRC 58 - 60), worm module m = 4, helix angle 20°; Cutting parameters: linear velocity 135 m / min, feed rate 0.2 mm / r, cutting depth 0.5 mm.

[0065] The advantages of this manufacturing method are as follows: Enhanced chipping resistance: The gradient cemented carbide substrate (low cobalt on the surface + high cobalt in the core) increases the edge impact strength by more than 40%, and the chipping rate drops to 1 / 3 of that of traditional tools;

[0066] Extended coating life: The TiCN / Al2O3 / TiSiN composite coating system has a heat resistance of 1200 °C, and the tool life is increased to 200 - 250 minutes (traditional tools ≤ 80 minutes);

[0067] Optimized edge stability: The laser micro - melting strengthening process makes the edge deformation amount ≤ 0.005 mm at high temperatures, and the continuous machining worm tooth profile error ≤ 0.02 mm;

[0068] Involute edge profile matching: The geometric fit degree between the bidirectional involute cutting edge and the worm helix angle is > 95%, and the tooth surface roughness Ra ≤ 0.8 μm (ISO 5 - level standard);

[0069] Function of the anti - friction coating: The friction coefficient of the TiSiN layer ≤ 0.3, reducing the cutting force by 15 - 20% and avoiding surface scratching defects on the worm;

[0070] Dynamic thermal control: The Al2O3 thermal insulation layer reduces 60% of the heat transfer to the tool body, and the substrate temperature is stabilized below 400 °C.

[0071] For the same or similar parts among the various embodiments in this specification, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0072] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An internal cyclone milling cutter head, comprising a fixed seat (1), characterized in that: A disk body (2) is detachably mounted on the fixed seat (1). A first processing hole (1.1) for a workpiece to pass through is provided at the central axis of the fixed seat (1). A second processing hole (2.1) coaxial with the first processing hole (1.1) is provided on the disk body (2). A plurality of blade grooves (2.2) for mounting milling blades (5) are formed on the disk body (2) along the circumferential direction of the second processing hole (2.1). The milling blades (5) are fixed in the blade grooves (2.2) by fixing bolts (6). A pressing groove (2.3) is communicated with the side wall of the blade groove (2.2). A pressing assembly (3) for pressing the milling blades (5) is arranged in the pressing groove (2.3). An adjusting bolt (4) is eccentrically arranged at the bottom of the blade groove (2.2). An adjusting hole (1.2) matched with the adjusting bolt (4) is arranged on the fixed seat (1). The adjusting bolt (4) passes through the fixed seat (1) and is threadedly connected with the disk body (2) through the adjusting hole (1.2). The eccentric direction of the adjusting bolt (4) is consistent with the radial adjusting direction of the milling blade (5); The radial adjustment amount Δr of the adjusting bolt (4) satisfies the formula: Δr = (P × e) / R, where: Δr is the radial displacement generated by a single rotation of the adjusting bolt (4); P is the axial moving distance of the adjusting bolt (4) when it rotates one circle; e is the eccentricity between the axis of the adjusting bolt (4) and the axis of the adjusting hole (1.2); R is the acting radius of the adjusting bolt (4); the ratio range of the eccentricity e to the axial moving distance P is 1:5 to 1:8; The pressing assembly (3) includes a pressing block (3.1). The pressing block (3.1) moves along a direction perpendicular to the radial adjusting direction of the milling blade (5). A moving long circular hole (3.2) is arranged on the pressing block (3.1) along its moving direction. A pressing bolt (3.3) is fitted and installed on the moving long circular hole (3.2). The pressing bolt (3.3) is threadedly connected with the fixed seat (1); A positioning long groove (1.4) is arranged in the blade groove (2.2). The length direction of the positioning long groove (1.4) is perpendicular to the radial adjusting direction of the milling blade (5). The positioning long groove (1.4) includes a protruding part (1.4.1) and a moving part (1.4.2). A positioning nut (8) is movably arranged in the moving part (1.4.2). A boss (8.1) extends circumferentially outwards from the positioning nut (8). A pressing plate (1.4.3) extends inwards from the moving part (1.4.2). The pressing plate (1.4.3) is located directly above the pressing plate (1.4.3). The positioning nut (8) is matched with the fixing bolt (6). The fixing bolt (6) passes through the milling blade (5) and is threadedly connected with the positioning nut (8); A limiting bolt (9) is installed in the protruding part (1.4.1); The bottom of the pressing block (3.1) is provided with a tightening bolt (3.4) in cooperation. The disc body (2) is provided with a tightening threaded through hole that cooperates with the tightening bolt (3.4). By rotating the tightening bolt (3.4), the tightening bolt (3.4) abuts against the wall surface of the milling cutter blade (5), thereby pressing the milling cutter blade (5). By adjusting the radial insertion distance of the milling cutter blade (5), the blade groove (2.2) is divided into a rough milling groove (2.2.1) and a finish milling groove (2.2.2), and the rough milling groove (2.2.1) and the finish milling groove (2.2.2) are arranged in an alternating manner.

2. The internal cyclone milling cutter head according to claim 1, characterized in that: The disc body (2) is provided with a first positioning hole (2.5), and the fixed seat (1) is provided with a second positioning hole (1.3) that cooperates with the first positioning hole (2.5). The first positioning hole (2.5) and the second positioning hole (1.3) are connected by a positioning pin (7). The first positioning hole (2.5) extends radially along the disc body (2) and is distributed in groups. The first positioning holes (2.5) in the same radial direction are in a group, and several groups of the first positioning holes (2.5) are circumferentially and evenly distributed around the central axis of the disc body (2).

3. A manufacturing method of an internal cyclone milling cutter head milling insert, applying an internal cyclone milling cutter head described in any one of claims 1-2, characterized in that: The manufacturing process of the milling cutter blade (5) is as follows: S1. Preparation of gradient cemented carbide substrate: The surface mixed powder and the core mixed powder are layered into a mold, and a cemented carbide substrate with low cobalt in the surface layer and high cobalt in the core is formed through a gradient sintering process. The surface mixed powder contains cobalt ≤ 6wt% and a grain growth inhibitor, and the core mixed powder contains cobalt 8 - 12wt%. S2: Cutting edge forming and strengthening: The substrate is subjected to five-axis grinding to form an involute cutting edge that matches the helix angle of the worm, and the edge area is subjected to laser micro-melting strengthening treatment to generate a nanocrystalline strengthening layer. S3: Deposition of multi-layer composite coating: A transition layer, a heat insulation layer, and an antifriction layer containing silicon elements are sequentially deposited on the substrate surface by physical vapor deposition technology. S4: Function verification: The tool life and machining accuracy are verified through worm cutting tests.

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