Carbon fiber processing alloy milling cutter and production process

Abstract

The invention relates to the technical field of alloy milling cutters, and particularly discloses a carbon fiber processing alloy milling cutter and a production process, the carbon fiber processing alloy milling cutter comprises a cutter body, the cutter body comprises a first cutting tooth, a second cutting tooth, a third cutting tooth and a fourth cutting tooth, and the cutter body is provided with a first chip groove and a second chip groove; the symmetrical arrangement of the first cutting teeth, the third cutting teeth, the second cutting teeth and the fourth cutting teeth can restrain machining vibration, the first cutting teeth and the third cutting teeth form a reverse cutting couple, the cutting vibration amplitude and the layering risk can be reduced, and the second cutting teeth and the fourth cutting teeth can restrain material layering. The axial cutting force is enhanced through the first cutting teeth and the third cutting teeth, the second cutting teeth and the fourth cutting teeth can conduct secondary micro cutting, scratches of chips to the machined surface are reduced, the discharging efficiency is improved through the first chip discharging grooves and the second chip discharging grooves, and tool overheating or material layering caused by chip accumulation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of alloy milling cutters, and in particular to an alloy milling cutter for carbon fiber processing and a production process. Background Art

[0002] Carbon fiber processing alloy milling cutter is a high-efficiency precision tool designed for cutting high-hardness and high-wear-resistant composite materials. It is mainly used in aerospace, new energy vehicles and high-end mold manufacturing, and is used to process high-performance materials such as carbon fiber reinforced resin-based composite materials and carbon fiber / epoxy resin laminates. Such materials have lightweight and high-strength characteristics, but due to their weak interlayer bonding, high hardness and significant anisotropy, defects such as delamination, burrs and fiber pullout are easily generated during processing, which places strict requirements on the tool's geometric structure, edge strength and thermal management performance.

[0003] In the prior art, most alloy milling cutters used for carbon fiber processing adopt a single spiral blade structure, whose spiral angle is fixed in the range of 10° to 15°, the cutting edge is arranged in a continuous straight line or a slowly changing curve, the number of cutting teeth is mostly 2-4 teeth, the axial force is concentrated during cutting, the blade is covered with a traditional TiN coating, a drilling head is arranged on the blade, the drilling head is a simple cone, and the tip angle is 60° to 90°. A chip groove is also provided on the blade, and the chip groove spiral angle and number of groups are the same as those of the spiral blade.

[0004] For the above-mentioned related technologies, when processing carbon fiber, the single spiral is easy to cause a sudden change in shear stress between carbon fiber layers, resulting in material delamination or tearing; at the same time, the lack of high-performance coating or only coating with traditional TiN coating has low microhardness and poor bonding strength. The coating is easy to peel off during high-speed cutting, and the exposed cemented carbide substrate directly contacts the hard abrasive particles in the carbon fiber, accelerating the wear of the cutting edge; in addition, the chip groove design of the single-spiral blade tool is relatively simple, and carbon fiber debris is easy to entangle into a ball, so improvements are made to this. Summary of the invention

[0005] In order to improve the above-mentioned problems existing in alloy milling cutters for carbon fiber processing, the present application provides an alloy milling cutter for carbon fiber processing and a production process.

[0006] The first aspect of the present application provides a carbon fiber processing alloy milling cutter, which adopts the following technical solution: A carbon fiber processing alloy milling cutter, comprising a tool handle and a tool body, characterized in that: the tool body comprises a cutting portion and a drilling portion, the side wall of the cutting portion is circumferentially provided with a first cutting tooth, a second cutting tooth, a third cutting tooth and a fourth cutting tooth, the first cutting tooth and the third cutting tooth are symmetrically arranged along the axis of the cutting portion, the first cutting tooth and the second cutting tooth are both multiple groups of spiral blades, the first cutting tooth is right-handed, the third cutting tooth is left-handed, and the section ratio angles of the first cutting tooth and the third cutting tooth are both 95°; The second cutting teeth and the fourth cutting teeth are symmetrically arranged along the axis of the cutting portion, the second cutting teeth and the fourth cutting teeth are both multiple groups of corrugated edges, the second cutting teeth are right-handed, and the fourth cutting teeth are left-handed, the second cutting teeth and the fourth cutting teeth are respectively arranged between the first cutting teeth and the third cutting teeth, and the section ratio angles of the second cutting teeth and the fourth cutting teeth are both 85°; A first chip removal groove is provided between the first cutting tooth and the second cutting tooth, and between the third cutting tooth and the fourth cutting tooth, and a second chip removal groove is provided between the second cutting tooth and the third cutting tooth, and between the fourth cutting tooth and the first cutting tooth; The drilling portion is provided with a guide groove for facilitating chips to enter the first chip removal groove and the second chip removal groove during drilling.

[0007] By adopting the above technical scheme, the first cutting teeth, the third cutting teeth and the second cutting teeth, the fourth cutting teeth are symmetrically alternately arranged to achieve balanced distribution of cutting force and suppress processing vibration. Compared with the traditional unidirectional spiral blade, the symmetrically arranged first cutting tooth of the right-hand 95° spiral blade and the third cutting tooth of the left-hand 95° spiral blade constitute a reverse cutting force couple, forming a self-balancing system in the axial direction, which can further reduce the cutting vibration amplitude and generate reverse torque during axial cutting to offset the radial tearing force during interlayer peeling of the carbon fiber and reduce the risk of delamination. The wavy cutting edge of the second cutting tooth of the right-hand 85° corrugated blade and the fourth cutting tooth of the left-hand 85° produce a pulsed cutting effect at the microscopic level, so that the shear force between the carbon fiber layers is evenly distributed, further suppressing material delamination.

[0008] In addition, the first cutting tooth and the third cutting tooth are spiral blades in opposite directions, and the cutting surface ratio angle is 95°, which also enhances the axial cutting force. The second cutting tooth and the fourth cutting tooth are corrugated blades, and the cutting surface ratio angle is 85°. Secondary micro-cutting can be performed in the spiral blade cutting gap, which not only ensures that the chip size is controllable, but also forms a microscopic chip storage space through the corrugated structure of the blade edge, thereby reducing the scratches of the chips on the processed surface. The two work together to improve the material removal rate. The first chip groove, the second chip groove and the drilling guide groove form a continuous chip removal channel, which improves the efficiency of carbon fiber debris discharge and avoids tool overheating or material stratification due to debris accumulation.

[0009] Optionally, the second cutting tooth includes a first corrugated tooth and a second corrugated tooth, the first corrugated tooth and the second corrugated tooth are arranged alternately, the helix angle of the first corrugated tooth is 70°, the helix angle of the second corrugated tooth is 63°, and the third cutting tooth includes a third corrugated tooth and a fourth corrugated tooth, the third corrugated tooth and the fourth corrugated tooth are arranged alternately, the helix angle of the third corrugated tooth is 66°, and the helix angle of the fourth corrugated tooth is 60°.

[0010] By adopting the above technical solution, the corrugated teeth with helix angles of 70° and 63° in the second cutting tooth are staggered, and the corrugated teeth with helix angles of 66° and 60° in the fourth cutting tooth are staggered, forming an asymmetric cutting force distribution, suppressing harmonic resonance, dispersing the vibration frequency to multiple frequency bands, avoiding the natural frequency of the carbon fiber plate, reducing the amplitude and processing noise, and the gradient decrease of the helix angle can gradually reduce the cutting resistance, make the shearing between carbon fiber layers smoother, and reduce the roughness of the processed surface.

[0011] Optionally, the helix angles of the first cutting tooth and the third cutting tooth are both 5°.

[0012] By adopting the above technical solution, compared with the conventional 15° helix angle, the axial cutting force is reduced, the delamination or tearing of the carbon fiber laminated material during processing is avoided, and the cutting edge rigidity is enhanced, which is suitable for intermittent cutting of carbon fiber and reduces the cutting edge chipping rate.

[0013] Optionally, a first chip breaker groove is formed on the first cutting tooth, and a second chip breaker groove is formed on the third cutting tooth. The helix angles of the first chip breaker groove and the second chip breaker groove are both 20°, the first chip breaker groove is left-handed, and the second chip breaker groove is right-handed.

[0014] By adopting the above technical scheme, the first chip breaker groove cooperates with the first cutting tooth in reverse, the second chip breaker groove cooperates with the third cutting tooth in reverse, and the first chip breaker groove and the second chip breaker groove respectively form a "mechanical weak zone" at the intersection of the first cutting tooth and the third cutting tooth. The sudden change effect of cutting force is utilized to force the chips to break periodically during the cutting process, shorten the chip length, and reduce the risk of winding. The helix angles of the first chip breaker groove and the second chip breaker groove respectively form an angle with the main edges of the first cutting tooth and the second cutting tooth, thereby enhancing the local strength of the first cutting tooth and the second cutting tooth, and at the same time guiding the chips to be curled and discharged in the direction of the chip discharge groove.

[0015] Optionally, multiple groups of the first chip breaking grooves and the second chip breaking grooves are provided, the spacing between adjacent first chip breaking grooves and adjacent second chip breaking grooves is 5 mm, and a single group of the first chip breaking grooves intersects with at least four groups of the first cutting teeth, and a single group of the second chip breaking grooves intersects with at least four groups of the third cutting teeth.

[0016] By adopting the above technical solution, the spacing between adjacent first chip breaking grooves and adjacent second chip breaking grooves is 5mm, so that the chips are forced to be cut off at the early stage of formation, and the chip length can be effectively controlled. A single group of first chip breaking grooves intersects with at least four groups of first cutting teeth, and a single group of second chip breaking grooves intersects with at least four groups of third cutting teeth, ensuring that the first chip breaking grooves and the second chip breaking grooves trigger four chip breaking actions within one rotation of the tool, achieving high-frequency chip breaking, reducing the contact time between the chips and the tool, and reducing cutting heat accumulation.

[0017] Optionally, the surface of the tool body is coated with a multi-layer titanium-based composite coating, the tool handle and the tool body are made of WC-Co cemented carbide, the surface of the tool body is coated with a multi-layer titanium-based composite coating, the multi-layer titanium-based composite coating includes a transition layer and a functional layer, the transition layer is 0.5-1.2μm thick, and is a gradient alloying layer of Ti and WC, the functional layer is 1.5-3.8μm thick, and is composed of TiAlN, with a microhardness ≥2800 HV0.05, a surface roughness Ra≤0.15μm, and a surface friction coefficient≤0.25.

[0018] By adopting the above technical solution, the transition layer is a gradient alloying layer from pure Ti to Ti and WC. Due to the presence of WC in the tool body material, a "chemical anchoring" effect can be formed with the transition layer to improve the bonding strength between the transition layer and the tool body. In addition, WC particles are dispersed in titanium as a reinforcing phase, blocking the extension path of microcracks inside the coating, thereby improving the toughness of the coating and avoiding coating peeling during high-speed cutting. The microhardness is ≥2800 HV0.05. Compared with uncoated tools, the wear of the cutting edge by silicide abrasive particles in the carbon fiber can be significantly inhibited. The surface roughness Ra≤0.15μm and the friction coefficient≤0.25 can reduce cutting heat and extend tool life.

[0019] Optionally, the drilling portion is configured in a pointed shape, the length of the drilling portion is 3 mm, the minimum length of the cutting portion is 20 mm, and the cross-section of the drilling portion along the length direction is an isosceles right triangle.

[0020] By adopting the above technical solution, the length of the drilling part is 3mm, which shortens the overhang of the drilling part, suppresses the vibration at the moment of cutting, avoids the edge chipping of the material, and the minimum length of the cutting part is 20mm. Typical carbon fiber laminates, such as drone wing skins, can be processed at one time. The minimum length of the cutting part is 20mm, which can also disperse the cutting heat and reduce the heat load per unit length. The cross-section of the drilling part along the length direction is an isosceles right triangle, which realizes low-resistance cutting of carbon fiber laminates and avoids material edge stratification. The cross-sectional shape cooperates with the guide groove to form a directional debris diversion channel, thereby improving the initial debris discharge efficiency.

[0021] The present application also provides a production process for a carbon fiber machining alloy milling cutter, comprising the following steps: S1: Powder metallurgy tool body forming, using ultra-fine grain cemented carbide powder mixed with a binder, and injection molding to form an integrated blank of the tool body and handle. After forming, it is degreased and vacuum sintered to obtain a matrix with a density of ≥99.5% and a hardness of ≥92HRA; S2: Five-axis grinding, using a diamond grinding wheel to grind the cutting part precisely, processing the first cutting teeth and the third cutting teeth with a helix angle of 5°, the second cutting teeth with staggered helix angles of 70° and 63°, and the fourth cutting teeth with helix angles of 66° and 60°, respectively. The guide grooves are formed in the first and second chip grooves by using the electric spark forming process, and the drilling part is processed into an isosceles right triangle cross section by laser cutting; S3: Edge passivation and chip breaker processing: the cutting tooth edge band is passivated by magnetic grinding process, and the chip breaker with a helical angle of 20° is processed at the first and second chip breaker grooves using a super-hard abrasive grinding wheel; S4: Physical vapor deposition coating preparation: the blade body is placed in a vacuum furnace, and the surface impurities are removed by argon ion bombardment cleaning. Ti target and Ar gas are introduced. The WC-Co matrix material is deposited with a gradient Ti alloying layer at a temperature of 450°C, and the composition gradually changes from pure Ti to Ti-20% WC. The target is switched to TiAl, and N is introduced. 2 , TiAlN coating was deposited under pulse bias voltage -100V, microhardness was controlled to be ≥2800 HV0.05, surface roughness Ra ≤0.15μm, and the coating surface was ion beam polished to make the friction coefficient ≤0.25; S5: Dynamic balancing correction was performed at a tool dynamic balancing machine speed of 20,000 rpm, and the residual unbalance was ≤0.5 g·mm. The coating thickness uniformity was detected using a white light interferometer, the edge geometry parameters were verified using a laser confocal microscope, and a cutting test was simulated; S6: After the simulated cutting test is passed, the non-cutting area of ​​the tool is encapsulated with an anti-oxidation wax coating, and the specification parameters and batch number are engraved on the tool handle by laser marking technology, with a character depth of 0.1mm±0.02mm.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The symmetrical alternating arrangement of the first cutting teeth, the third cutting teeth, the second cutting teeth, and the fourth cutting teeth achieves balanced distribution of cutting force and suppresses processing vibration. The symmetrically arranged first cutting teeth with a right-handed 95° spiral blade and the third cutting teeth with a left-handed 95° spiral blade form a reverse cutting force couple, forming a self-balancing system in the axial direction, which can further reduce the amplitude of cutting vibration and generate reverse torque during axial cutting to offset the radial tearing force during interlayer peeling of carbon fiber and reduce the risk of delamination. The wavy cutting edges of the second cutting teeth with a right-handed 85° corrugated blade and the fourth cutting teeth with a left-handed 85° corrugated blade generate a pulsed cutting effect at the microscopic level, which evenly distributes the shear force between carbon fiber layers and further suppresses material delamination. 2. The first and third cutting teeth are spiral blades with opposite directions and a cut surface ratio angle of 95°, which also enhances the axial cutting force. The second and fourth cutting teeth are corrugated blades with a cut surface ratio angle of 85°. Secondary micro-cutting can be performed in the cutting gap of the spiral blades, which not only ensures that the chip size is controllable, but also forms a microscopic chip storage space through the corrugated structure of the blade edge, reducing the scratches of the chips on the machined surface. The two work together to improve the material removal rate. The first chip groove, the second chip groove and the drilling guide groove form a continuous chip removal channel, which improves the efficiency of carbon fiber chip removal and avoids tool overheating or material stratification caused by chip accumulation; 3. The corrugated teeth with helix angles of 70° and 63° in the second cutting tooth are staggered, and the corrugated teeth with helix angles of 66° and 60° in the fourth cutting tooth are staggered, forming an asymmetric cutting force distribution, suppressing harmonic resonance, dispersing the vibration frequency to multiple frequency bands, avoiding the natural frequency of the carbon fiber plate, reducing the amplitude and processing noise, and the gradient decrease of the helix angle can gradually reduce the cutting resistance, make the shearing between carbon fiber layers smoother, and reduce the roughness of the processed surface; 4. The first chip breaker groove cooperates with the first cutting tooth in the opposite direction, and the second chip breaker groove cooperates with the third cutting tooth in the opposite direction. The intersections of the first chip breaker groove and the second chip breaker groove with the first cutting tooth and the third cutting tooth respectively form a "mechanical weak zone", which uses the sudden change effect of cutting force to force the chips to break periodically during the cutting process, shorten the chip length, and reduce the risk of winding. The helix angles of the first chip breaker groove and the second chip breaker groove form an angle with the main edges of the first cutting tooth and the second cutting tooth respectively, thereby enhancing the local strength of the first cutting tooth and the second cutting tooth, and guiding the chips to curl and discharge in the direction of the chip discharge groove; 5. The spacing between adjacent first chip breaker grooves and adjacent second chip breaker grooves is 5mm, so that the chips are forced to be cut off at the early stage of formation, which can effectively control the chip length. A single group of first chip breaker grooves intersects with at least four groups of first cutting teeth, and a single group of second chip breaker grooves intersects with at least four groups of third cutting teeth, ensuring that the first chip breaker groove and the second chip breaker groove trigger four chip breaking actions within one rotation of the tool, achieving high-frequency chip breaking, reducing the contact time between the chip and the tool, and reducing the accumulation of cutting heat; 6. The transition layer is a gradient alloying layer from pure Ti to Ti and WC. Due to the presence of WC in the tool body material, it can form a "chemical anchoring" effect with the transition layer, thereby improving the bonding strength between the transition layer and the tool body. In addition, WC particles are dispersed in titanium as a reinforcing phase, blocking the extension path of microcracks inside the coating, improving the toughness of the coating, and avoiding coating peeling during high-speed cutting. The microhardness is ≥2800 HV0.05. Compared with uncoated tools, it can significantly inhibit the wear of the cutting edge by silicide abrasives in the carbon fiber. The surface roughness is Ra≤0.15μm, and the friction coefficient is ≤0.25, which can reduce cutting heat and extend tool life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the alloy milling cutter in the embodiment of the present application; Figure 2 yes Figure 1 Another perspective of Figure 3 yes Figure 2 Another perspective of Figure 4 yes Figure 3 Another perspective of Figure 5 yes Figure 4 Another perspective of Figure 6 yes Figure 5 Another perspective of .

[0025] Figure numerals: 1. tool handle; 2. tool body; 21. cutting part; 211. first cutting tooth; 212. second cutting tooth; 213. third cutting tooth; 214. fourth cutting tooth; 22. drilling part; 23. first chip groove; 24. second chip groove; 25. guide groove; 3. first chip breaker groove; 4. second chip breaker groove. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-6 This application is described in further detail.

[0027] The present application embodiment discloses a carbon fiber machining alloy milling cutter. Figure 1 and Figure 2 A carbon fiber processing alloy milling cutter comprises a shank 1 and a cutter body 2. The shank 1 and the cutter body 2 are made of WC-Co cemented carbide. The shank 1 and the cutter body 2 are integrally arranged. The cutter body 2 comprises a cutting portion 21 and a drilling portion 22. The side wall of the cutting portion 21 is circumferentially provided with a first cutting tooth 211, a second cutting tooth 212, a third cutting tooth 213 and a fourth cutting tooth 214. The first cutting tooth 211 and the third cutting tooth 213 are symmetrically arranged along the axis of the cutting portion 21. Both the first cutting tooth 211 and the second cutting tooth 212 are multiple sets of spiral blades, and the first cutting tooth 211 is right-handed, and the third cutting tooth 213 is left-handed. The section ratio angles of the first cutting tooth 211 and the third cutting tooth 213 are both 95°.

[0028] The second cutting tooth 212 and the fourth cutting tooth 214 are symmetrically arranged along the axis of the cutting portion 21. The second cutting tooth 212 and the fourth cutting tooth 214 are both multiple groups of corrugated edges, and the second cutting tooth 212 is right-handed, and the fourth cutting tooth 214 is left-handed. The second cutting tooth 212 and the fourth cutting tooth 214 are respectively arranged between the first cutting tooth 211 and the third cutting tooth 213, and the section ratio angles of the second cutting tooth 212 and the fourth cutting tooth 214 are both 85°.

[0029] The cutting portion 21 is integrally arranged on the shank 1, and the drilling portion 22 is integrally arranged at the end of the cutting portion 21 away from the shank 1. A first chip groove 23 is provided between the first cutting tooth 211 and the second cutting tooth 212, and between the third cutting tooth 213 and the fourth cutting tooth 214. A second chip groove 24 is provided between the second cutting tooth 212 and the third cutting tooth 213, and between the fourth cutting tooth 214 and the first cutting tooth 211. The drilling portion 22 is arranged in a pointed shape, and a guide groove 25 is provided on the drilling portion 22 for facilitating the entry of debris into the first chip groove 23 and the second chip groove 24 during drilling.

[0030] The symmetrical alternating arrangement of the first cutting tooth 211, the third cutting tooth 213 and the second cutting tooth 212, the fourth cutting tooth 214 achieves a balanced distribution of cutting force and suppresses processing vibration. Compared with the traditional unidirectional spiral blade, the symmetrically arranged first cutting tooth 211 of the right-hand 95° spiral blade and the third cutting tooth 213 of the left-hand 95° spiral blade constitute a reverse cutting force couple, forming a self-balancing system in the axial direction, which can further reduce the cutting vibration amplitude and generate reverse torque during axial cutting to offset the radial tearing force during carbon fiber interlayer peeling and reduce the risk of delamination. The wavy cutting edges of the second cutting tooth 212 of the right-hand 85° corrugated blade and the fourth cutting tooth 214 of the left-hand 85° produce a pulsed cutting effect at the microscopic level, which makes the shear force between carbon fiber layers evenly distributed, thereby further suppressing material delamination.

[0031] In addition, the first cutting tooth 211 and the third cutting tooth 213 are spiral blades in opposite directions, and the cutting surface ratio angle is 95°, which also enhances the axial cutting force. The second cutting tooth 212 and the fourth cutting tooth 214 are corrugated blades, and the cutting surface ratio angle is 85°. Secondary micro-cutting can be performed in the spiral blade cutting gap, which not only ensures that the chip size is controllable, but also forms a microscopic chip storage space through the corrugated structure of the blade edge, thereby reducing the scratches of the chips on the processed surface. The two work together to improve the material removal rate. The first chip groove 23, the second chip groove 24 and the guide groove 25 of the drilling part 22 form a continuous chip removal channel, which improves the efficiency of carbon fiber debris discharge and avoids tool overheating or material stratification due to debris accumulation.

[0032] Reference Figure 4 and Figure 6In this embodiment, the second cutting tooth 212 includes a first corrugated tooth and a second corrugated tooth, the first corrugated tooth and the second corrugated tooth are arranged alternately, the helix angle of the first corrugated tooth is 70°, and the helix angle of the second corrugated tooth is 63°. The third cutting tooth 213 includes a third corrugated tooth and a fourth corrugated tooth, the third corrugated tooth and the fourth corrugated tooth are arranged alternately, the helix angle of the third corrugated tooth is 66°, and the helix angle of the fourth corrugated tooth is 60°.

[0033] The corrugated teeth with helix angles of 70° and 63° in the second cutting tooth 212 are staggered, and the corrugated teeth with helix angles of 66° and 60° in the fourth cutting tooth 214 are staggered, forming an asymmetric cutting force distribution, suppressing harmonic resonance, dispersing the vibration frequency to multiple frequency bands, avoiding the natural frequency of the carbon fiber plate, reducing the amplitude and processing noise, and the gradient decrease of the helix angle can gradually reduce the cutting resistance, make the shearing between carbon fiber layers smoother, and reduce the roughness of the processed surface.

[0034] Reference Figure 3 and Figure 5 , the helix angles of the first cutting tooth 211 and the third cutting tooth 213 are both 5°. Compared with the conventional 15° helix angle, the axial cutting force is reduced, the delamination or tearing of the carbon fiber laminate material during processing is avoided, and the edge rigidity is enhanced, which is suitable for intermittent cutting of carbon fiber and reduces the edge chipping rate. The first cutting tooth 211 is provided with a first chip breaker groove 3, and the third cutting tooth 213 is provided with a second chip breaker groove 4. The helix angles of the first chip breaker groove 3 and the second chip breaker groove 4 are both 20°, the first chip breaker groove 3 is left-handed, and the second chip breaker groove 4 is right-handed.

[0035] The first chip breaker groove 3 cooperates with the first cutting tooth 211 in reverse, and the second chip breaker groove 4 cooperates with the third cutting tooth 213 in reverse, and the intersection points of the first chip breaker groove 3, the second chip breaker groove 4, the first cutting tooth 211, and the third cutting tooth 213 respectively form a "mechanical weak zone", which utilizes the sudden change effect of cutting force to force the chips to break periodically during the cutting process, shorten the chip length, and reduce the risk of entanglement. The helix angles of the first chip breaker groove 3 and the second chip breaker groove 4 form an angle with the main edges of the first cutting tooth 211 and the second cutting tooth 212 respectively, thereby enhancing the local strength of the first cutting tooth 211 and the second cutting tooth 212, and guiding the chips to curl and discharge in the direction of the chip discharge groove.

[0036] Reference Figure 3 and Figure 5, the first chip breaker groove 3 and the second chip breaker groove 4 are provided with multiple groups, the spacing between adjacent first chip breaker grooves 3 and adjacent second chip breaker grooves 4 is 5mm, and a single group of first chip breaker grooves 3 intersects with at least four groups of first cutting teeth 211, and a single group of second chip breaker grooves 4 intersects with at least four groups of third cutting teeth 213. The spacing between adjacent first chip breaker grooves 3 and adjacent second chip breaker grooves 4 is 5mm, so that the chips are forced to be cut off at the early stage of formation, which can effectively control the chip length, and a single group of first chip breaker grooves 3 intersects with at least four groups of first cutting teeth 211, and a single group of second chip breaker grooves 4 intersects with at least four groups of third cutting teeth 213, ensuring that the first chip breaker grooves 3 and the second chip breaker grooves 4 trigger four chip breaking actions within one rotation of the tool, achieving high-frequency chip breaking, reducing the contact time between the chips and the tool, and reducing the accumulation of cutting heat.

[0037] The surface of the blade body 2 is coated with a multi-layer titanium-based composite coating, which includes a transition layer and a functional layer. The transition layer is 0.5-1.2 μm thick and is a gradient alloying layer of Ti and a base material. The functional layer is 1.5-3.8 μm thick and is composed of TiAlN. The microhardness is ≥2800 HV0.05, the surface roughness is Ra≤0.15 μm, and the surface friction coefficient is ≤0.25.

[0038] The transition layer is a gradient alloying layer from pure Ti to Ti and WC. Due to the presence of WC in the material of the tool body 2, a "chemical anchoring" effect can be formed with the transition layer to improve the bonding strength between the transition layer and the tool body 2. In addition, WC particles are dispersed in titanium as a reinforcing phase, blocking the extension path of microcracks inside the coating, improving the toughness of the coating, and avoiding coating peeling during high-speed cutting. The microhardness is ≥2800 HV0.05. Compared with uncoated tools, it can significantly inhibit the wear of the silicide abrasive particles in the carbon fiber on the cutting edge. The surface roughness Ra≤0.15μm, the friction coefficient≤0.25, can reduce cutting heat, and extend tool life.

[0039] Reference Figure 3 and Figure 4 , the length of the drilling portion 22 is 3mm, the minimum length of the cutting portion 21 is 20mm, and the cross section of the drilling portion 22 along the length direction is an isosceles right triangle. The length of the drilling portion 22 is 3mm, which shortens the overhang of the drilling portion 22, suppresses the vibration at the moment of cutting, and avoids the edge of the material from breaking. The minimum length of the cutting portion 21 is 20mm, which can process typical carbon fiber laminates at one time, such as the wing skin of a drone, and the minimum length of the cutting portion 21 is 20mm. It can also disperse the cutting heat and reduce the heat load per unit length. The cross section of the drilling portion 22 along the length direction is an isosceles right triangle, which realizes low-resistance cutting of carbon fiber laminates and avoids material edge stratification. The cross-sectional shape cooperates with the guide groove 25 to form a directional debris diversion channel to improve the initial debris discharge efficiency.

[0040] The implementation principle of a carbon fiber processing alloy milling cutter in the first embodiment of the present application is as follows: When it is necessary to suppress material delamination, the first cutting teeth 211, the third cutting teeth 213 and the second cutting teeth 212, the fourth cutting teeth 214 are symmetrically alternately arranged to achieve balanced distribution of cutting force and suppress processing vibration. The symmetrically arranged first cutting teeth 211 with a right-handed 95° spiral blade and the third cutting teeth 213 with a left-handed 95° spiral blade constitute a reverse cutting force couple, forming a self-balancing system in the axial direction, which can further reduce the cutting vibration amplitude and generate reverse torque during axial cutting to offset the radial tearing force during carbon fiber interlayer peeling and reduce the risk of delamination. The wavy cutting edges of the second cutting teeth 212 with a right-handed 85° corrugated blade and the fourth cutting teeth 214 with a left-handed 85° blade generate a pulsed cutting effect at the microscopic level, which makes the shear force between carbon fiber layers evenly distributed, further suppressing material delamination.

[0041] When it is necessary to avoid the influence of too long chips on the use of the milling cutter itself, the first chip breaker groove 3 cooperates with the first cutting tooth 211 in the opposite direction, and the second chip breaker groove 4 cooperates with the third cutting tooth 213 in the opposite direction, and the first chip breaker groove 3 and the second chip breaker groove 4 respectively form a "mechanical weak zone" at the intersection of the first cutting tooth 211 and the third cutting tooth 213, and utilize the sudden change effect of cutting force to force the chips to break periodically during the cutting process, shorten the chip length, and reduce the risk of winding. The helix angles of the first chip breaker groove 3 and the second chip breaker groove 4 respectively form an angle with the main edges of the first cutting tooth 211 and the second cutting tooth 212, thereby enhancing the local strength of the first cutting tooth 211 and the second cutting tooth 212, and guiding the chips to curl and discharge in the direction of the chip discharge groove.

[0042] When it is necessary to improve the strength of the coating attached to the milling cutter, the transition layer is a gradient alloying layer of pure Ti gradually changing to Ti and WC. Due to the presence of WC in the material of the tool body 2, a "chemical anchoring" effect can be formed with the transition layer to improve the bonding strength between the transition layer and the tool body 2. In addition, WC particles are dispersed in titanium as a reinforcing phase, blocking the extension path of microcracks inside the coating, improving the toughness of the coating, and avoiding coating peeling during high-speed cutting. The microhardness is ≥2800 HV0.05. Compared with uncoated tools, it can significantly inhibit the wear of the cutting edge by silicide abrasives in the carbon fiber. The surface roughness is Ra≤0.15μm, the friction coefficient is ≤0.25, and the cutting heat can be reduced to extend the tool life.

[0043] This embodiment also provides a production process for a carbon fiber machining alloy milling cutter, comprising the following steps: S1: Powder metallurgy tool body 2 is formed by mixing ultrafine grain cemented carbide powder with a binder, and an integrated blank of tool body 2 and tool handle 1 is formed by injection molding process. After forming, degreasing and vacuum sintering are performed to obtain a matrix with a density of ≥99.5% and a hardness of ≥92HRA; S2: Five-axis linkage grinding, using a diamond grinding wheel to perform precision grinding on the cutting portion 21, respectively processing the first cutting teeth 211 and the third cutting teeth 213 with a helical angle of 5°, the second cutting teeth 212 with staggered helical angles of 70° and 63°, and the fourth cutting teeth 214 with helical angles of 66° and 60°, forming the guide grooves 25 in the first chip grooves 23 and the second chip grooves 24 by using an electrospark forming process, and processing the drilling portion 22 into an isosceles right triangle cross section by laser cutting; S3: Edge passivation and chip breaker processing: the cutting tooth edge band is passivated by magnetic grinding process, and the chip breaker with a helical angle of 20° is processed at the positions of the first chip breaker 3 and the second chip breaker 4 by using a super-hard abrasive grinding wheel; S4: Physical vapor deposition coating preparation: the blade 2 is placed in a vacuum furnace, and the surface impurities are removed by argon ion bombardment cleaning. Ti target and Ar gas are introduced. The WC-Co matrix material is deposited with a gradient Ti alloying layer at a temperature of 450°C, and the composition gradually changes from pure Ti to Ti-20% WC. The target is switched to TiAl, and N is introduced. 2 , TiAlN coating was deposited under pulse bias voltage -100V, microhardness was controlled to be ≥2800 HV0.05, surface roughness Ra ≤0.15μm, and the coating surface was ion beam polished to make the friction coefficient ≤0.25; S5: Dynamic balancing correction was performed at a tool dynamic balancing machine speed of 20,000 rpm, and the residual unbalance was ≤0.5 g·mm. The coating thickness uniformity was detected using a white light interferometer, the edge geometry parameters were verified using a laser confocal microscope, and a cutting test was simulated; S6: After the simulated cutting test is passed, the non-cutting area of ​​the tool is encapsulated with an anti-oxidation wax coating, and the specification parameters and batch number are engraved on the handle 1 by laser marking technology, with a character depth of 0.1mm±0.02mm.

[0044] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0045] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A carbon fiber machining alloy milling cutter, comprising a handle and a cutter body, characterized in that: The cutter body comprises a cutting portion and a drilling portion, the side wall of the cutting portion is circumferentially provided with a first cutting tooth, a second cutting tooth, a third cutting tooth and a fourth cutting tooth, the first cutting tooth and the third cutting tooth are symmetrically arranged along the axis of the cutting portion, the first cutting tooth and the second cutting tooth are both multiple groups of spiral blades, the first cutting tooth is right-handed, the third cutting tooth is left-handed, and the section ratio angles of the first cutting tooth and the third cutting tooth are both 95°; The second cutting teeth and the fourth cutting teeth are symmetrically arranged along the axis of the cutting portion, the second cutting teeth and the fourth cutting teeth are both multiple groups of corrugated edges, the second cutting teeth are right-handed, and the fourth cutting teeth are left-handed, the second cutting teeth and the fourth cutting teeth are respectively arranged between the first cutting teeth and the third cutting teeth, and the section ratio angles of the second cutting teeth and the fourth cutting teeth are both 85°; A first chip removal groove is provided between the first cutting tooth and the second cutting tooth, and between the third cutting tooth and the fourth cutting tooth, and a second chip removal groove is provided between the second cutting tooth and the third cutting tooth, and between the fourth cutting tooth and the first cutting tooth; The drilling portion is provided with a guide groove for facilitating chips to enter the first chip removal groove and the second chip removal groove during drilling.

2. The carbon fiber machining alloy milling cutter according to claim 1, characterized in that: The second cutting teeth include a first corrugated tooth and a second corrugated tooth, the first corrugated tooth and the second corrugated tooth are arranged alternately, the helix angle of the first corrugated tooth is 70°, and the helix angle of the second corrugated tooth is 63°. The third cutting teeth include a third corrugated tooth and a fourth corrugated tooth, the third corrugated tooth and the fourth corrugated tooth are arranged alternately, the helix angle of the third corrugated tooth is 66°, and the helix angle of the fourth corrugated tooth is 60°.

3. The carbon fiber machining alloy milling cutter according to claim 1, characterized in that: The helix angles of the first cutting teeth and the third cutting teeth are both 5°.

4. The carbon fiber machining alloy milling cutter according to claim 3, characterized in that: The first cutting tooth is provided with a first chip breaker groove, and the third cutting tooth is provided with a second chip breaker groove. The helix angles of the first chip breaker groove and the second chip breaker groove are both 20°. The first chip breaker groove is left-handed, and the second chip breaker groove is right-handed.

5. The carbon fiber machining alloy milling cutter according to claim 4, characterized in that: The first chip breaker grooves and the second chip breaker grooves are each provided with multiple groups, the spacing between adjacent first chip breaker grooves and adjacent second chip breaker grooves is 5 mm, and a single group of the first chip breaker grooves intersects with at least four groups of the first cutting teeth, and a single group of the second chip breaker grooves intersects with at least four groups of the third cutting teeth.

6. The carbon fiber machining alloy milling cutter according to claim 1, characterized in that: The handle and the tool body are made of WC-Co cemented carbide, and the surface of the tool body is coated with a multi-layer titanium-based composite coating, which includes a transition layer and a functional layer. The transition layer is 0.5-1.2 μm thick and is a gradient alloy layer of Ti and WC. The functional layer is 1.5-3.8 μm thick and is TiAlN. The microhardness is ≥2800 HV0.05, the surface roughness is Ra≤0.15 μm, and the surface friction coefficient is ≤0.

25.

7. The carbon fiber machining alloy milling cutter according to claim 1, characterized in that: The drilling portion is arranged in a pointed shape, the length of the drilling portion is 3 mm, the minimum length of the cutting portion is 20 mm, and the cross section of the drilling portion along the length direction is an isosceles right triangle.

8. A production process for a carbon fiber processing alloy milling cutter, based on the carbon fiber processing alloy milling cutter according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Powder metallurgy tool body forming, using ultra-fine grain cemented carbide powder mixed with a binder, and injection molding to form an integrated blank of the tool body and handle. After molding, degreasing and vacuum sintering are performed to obtain a WC-Co matrix material with a density of ≥99.5% and a hardness of ≥92HRA; S2: Five-axis grinding, using a diamond grinding wheel to grind the cutting part precisely, processing the first cutting teeth and the third cutting teeth with a helix angle of 5°, the second cutting teeth with staggered helix angles of 70° and 63°, and the fourth cutting teeth with helix angles of 66° and 60°, respectively. The guide grooves are formed in the first and second chip grooves by using the electric spark forming process, and the drilling part is processed into an isosceles right triangle cross section by laser cutting; S3: Edge passivation and chip breaker processing: the cutting tooth edge band is passivated by magnetic grinding process, and the chip breaker with a helical angle of 20° is processed at the first and second chip breaker grooves using a super-hard abrasive grinding wheel; S4: Physical vapor deposition coating preparation, the blade is placed in a vacuum furnace, and the surface impurities are removed by argon ion bombardment cleaning, and Ti target and Ar gas are introduced. The WC-Co matrix material is deposited with a gradient Ti alloying layer at a temperature of 450°C, and the composition gradually changes from pure Ti to Ti-20% WC. Then, the target is switched to TiAl, and N2 is introduced. TiAlN coating is deposited under a pulse bias of -100V, and the microhardness is controlled to be ≥2800 HV0.05, and the surface roughness Ra≤0.15μm. The coating surface is polished by ion beam to make the friction coefficient ≤0.25; S5: Dynamic balancing correction was performed at a tool dynamic balancing machine speed of 20,000 rpm, and the residual unbalance was ≤0.5 g·mm. The coating thickness uniformity was detected using a white light interferometer, the edge geometry parameters were verified using a laser confocal microscope, and a cutting test was simulated; S6: After the simulated cutting test is passed, the non-cutting area of ​​the tool is encapsulated with an anti-oxidation wax coating, and the specification parameters and batch number are engraved on the tool handle (1) by laser marking technology, with a character depth of 0.1mm±0.02mm.

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