High-light mobile phone camera plunge milling disposable cutter and manufacturing method thereof

Abstract

The invention relates to the technical field of cutters, and particularly discloses a high-light mobile phone camera plunge milling disposable cutter and a manufacturing method thereof.The high-light mobile phone camera plunge milling disposable cutter comprises a cutter handle, a cutter body and a fastener, a containing groove is formed in the bottom of the cutter handle, a first threaded hole is formed in the containing groove, and a second threaded hole is formed in the cutter body; the fastener is installed on the first threaded hole of the cutter handle through the second threaded hole in the cutter body so that the cutter body can be fixedly installed on the cutter handle. The cutter body comprises a mounting part and a cutter grain integrally formed with the mounting part, and when the cutter handle rotates, the cutter grain on the mounting part is in contact with the machining surface of an external component for cutting operation.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and in particular discloses a high-gloss mobile phone camera plunge milling and discarding type cutting tool and a manufacturing method thereof. Background Art

[0002] In the plunge milling of precision components such as high-gloss mobile phone cameras, existing disposable tools face multiple technical bottlenecks: there are defects in the design of the tool cutting structure, the connection strength between the tool grain and the mounting part is insufficient, the blade is easily worn or cracked due to vibration during high-speed cutting, and the chip removal path is not smooth, which can easily cause chip accumulation, affecting the processing accuracy; the fixing method of the tool handle and the tool body relies on a single threaded connection, and the torque generated by the cutting force can easily cause the fastener to loosen after long-term use. When the countersink depth does not match the component thickness properly, it may also cause the screw head to protrude from the surface of the tool body, causing processing interference; the heat dissipation and coating technology are backward, the cutting fluid circulation path is single, and it cannot effectively remove the cutting heat. In addition, the wear resistance and corrosion resistance of the tool grain surface coating are insufficient, making it difficult to meet the strict requirements of high-gloss surface processing on tool life. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a high-gloss mobile phone camera milling and discarding tool and a manufacturing method thereof.

[0004] To achieve the above-mentioned object, the present invention provides a high-gloss mobile phone camera plunge milling and discarding tool, comprising a tool handle, a tool body, and a fastener. The tool handle is provided with a receiving groove at the bottom thereof, a first threaded hole being provided in the receiving groove, and a second threaded hole being provided on the tool body. The fastener is installed in the first threaded hole of the tool handle via the second threaded hole on the tool body to fix the tool body on the tool handle. The tool body comprises a mounting portion and a blade integrally formed with the mounting portion. When the tool handle rotates, the blade on the mounting portion contacts the machining surface of an external component to perform a cutting operation.

[0005] The free end of the blade is provided with a notch, at the notch is provided a first blade portion and a first pressing portion integrally formed with the first blade portion, the angle between the first pressing portion and the first blade portion is 0-180°, the first pressing portion is used to press the external component, and the first blade portion performs a cutting operation on the side of the external component.

[0006] The mounting portion of the cutter body is embedded in the receiving groove at the bottom of the shank, and a fastener (such as a screw) is passed through the second threaded hole of the cutter body and connected to the first threaded hole of the shank to achieve a stable assembly of the cutter body and the shank; the cutter grain and the mounting portion are integrally formed, and the notch at the free end forms a first blade portion and a first pressing portion that are perpendicular to each other. During cutting, the first pressing portion first contacts and presses the surface of the external component, providing a stable support reference for the first blade portion, and then the blade portion performs precise cutting on the side of the component. This design brings significant beneficial effects: in terms of structural stability, the integrally formed cutter grain and mounting portion enhance the overall strength of the cutting structure and reduce vibration deformation during high-speed rotation; in terms of processing accuracy, the vertically arranged pressing portion and the blade portion form a "pressing-cutting" linkage structure, and the pressing portion can effectively offset the lateral displacement caused by the cutting force, ensuring that the blade portion accurately cuts along a predetermined trajectory and avoids processing deviations caused by workpiece shaking.

[0007] The blade particle is further provided with an inclined guide surface, which is arranged on the side of the first blade portion. The inclined guide surface forms an angle of 15°-30° with the axis of the blade particle, and the inclined guide surface forms a chip removal path.

[0008] An inclined guide surface with an angle of 15°-30° to the axis of the blade is machined on the side of the first blade, forming a continuous chip removal path. When the tool rotates and cuts at high speed, the inclined guide surface uses its specific angle to guide the chips generated during the cutting process to be discharged along the inclined direction, preventing the chips from being trapped between the blade and the machined surface. This design brings significant beneficial effects: chip removal efficiency is improved, and the diversion effect of the inclined guide surface allows the chips to quickly escape from the cutting area, reducing scratches on the machined surface or tool clogging caused by chip accumulation; processing quality is optimized, and the smooth discharge of chips reduces the secondary friction between the blade and the chips. Combined with the stable support of the holding part, it can effectively improve the finish and precision of the machined surface; tool life is extended, and the inclined guide surface reduces the squeezing and wear of chips on the blade, while reducing the local accumulation of cutting heat. Especially under the high-precision requirements of high-gloss surface processing, it can significantly improve the durability of the tool, reduce the frequent tool changes caused by edge wear, and improve production efficiency.

[0009] The fastener is a screw, the accommodating groove is provided with a first countersunk hole, the first threaded hole is connected to the first countersunk hole, the cutter body is provided with a second countersunk hole, and the second countersunk hole is connected to the second threaded hole; the depth of the first countersunk hole is the same as the depth of the mounting part of the cutter body, the depth of the second countersunk hole is the same as the depth of the screw head, and the screw head is flush with the surface of the cutter body after sinking into the second countersunk hole.

[0010] A first countersunk hole with the same depth as the tool body mounting portion is machined in the tool holder receiving groove, and a first threaded hole is opened at the bottom of the countersunk hole; at the same time, a second countersunk hole matching the depth of the screw head is machined in the tool body mounting portion, so that the second threaded hole is connected to the second countersunk hole. During assembly, the screw is passed through the second countersunk hole of the tool body and screwed into the first threaded hole of the tool holder until the screw head is completely sunk into the second countersunk hole and flush with the surface of the tool body. This design brings significant beneficial effects: in terms of structural reliability, the precise matching of the countersunk hole depth and the component thickness allows the screw head to be flush with the tool body surface, avoiding scratches on the workpiece or interference with the equipment due to the protrusion of the screw during processing; in terms of connection stability, the coaxial connection structure of the countersunk hole and the threaded hole ensures that the screw preload force is evenly transmitted to the fitting surface of the tool holder and the tool body.

[0011] An elastic washer is provided between the screw head and the second countersunk hole. The outer diameter of the elastic washer is larger than the diameter of the second countersunk hole and smaller than the annular step on the outer edge of the second countersunk hole, which is used to prevent the screw from loosening and evenly distribute the pre-tightening force.

[0012] During assembly, first place the elastic washer in the second countersunk hole. Its outer diameter is slightly larger than the countersunk hole diameter, so that the washer edge fits under the circular step on the outer edge of the second countersunk hole. Then, thread the screw through the washer and into the second and first threaded holes. The elastic washer elastically deforms under the preload of the screw, fitting tightly against the screw head, the bottom of the countersunk hole, and the step surface. This design brings significant beneficial effects: anti-loosening mechanism, the elastic restoring force of the elastic washer forms a continuous friction force between the screw head and the countersink, effectively offsetting the axial loosening trend caused by high-speed cutting vibration, and avoiding the displacement or falling of the tool body due to loose screws; preload force is uniformed, the flexible contact characteristics of the washer can evenly distribute the preload force of the screw to the surface of the tool body, preventing deformation or cracks in the mounting part caused by local stress concentration, and improving the reliability of the connection between the tool holder and the tool body; dynamic stability is enhanced, in a high-frequency vibration processing environment, the buffering effect of the elastic washer can absorb the impact load during the cutting process, reduce the rigid collision between the fastener and the countersink, and extend the service life of the screw, countersink and annular step, which is especially suitable for high-precision high-gloss surface processing scenarios, ensuring the stability and consistency of the tool structure during long-term processing.

[0013] The cutter body is also provided with a heat dissipation channel for filling cutting fluid, and the heat dissipation channel includes a first heat dissipation port opened on the side of the cutter particle, a second heat dissipation port on the bottom surface of the first holding portion, and an internal flow channel connecting the first heat dissipation port and the second heat dissipation port; the first heat dissipation port is an elliptical through hole with a major axis diameter of 1.2-2.0 mm and a minor axis diameter of 0.8-1.5 mm; the second heat dissipation port is a circular through hole with a diameter of 0.6-1.0 mm; the aperture of the internal flow channel gradually decreases from the first heat dissipation port to the second heat dissipation port.

[0014] The tapered flow channel uses the Venturi effect to increase the flow rate of the cutting fluid, enhance the heat exchange efficiency with the tool particles, quickly remove the heat generated during the cutting process, and avoid material softening or thermal deformation of the tool particles due to high temperature. It is especially suitable for precision components that are sensitive to temperature in high-gloss processing. The elliptical first heat dissipation port expands the cutting fluid suction area, and the circular second heat dissipation port is precisely aligned with the contact area between the blade and the processing surface. The high-speed ejection of cutting fluid can effectively flush the chips, and the inclined guide surface forms a dual chip removal path to prevent surface scratches caused by chip retention.

[0015] The end of the tool handle away from the tool body is provided with a mounting shaft, the mounting shaft includes a first shaft body, and the end of the first shaft body away from the tool handle is provided with a clamping portion; the clamping portion includes a first boss and a second boss arranged on the first boss, the diameter of the first boss is larger than the diameter of the second boss, the second boss is connected to the first boss by a first transition fillet, and a second transition fillet is provided on the top of the second boss. The first transition fillet and the second transition fillet can reduce the contact stress between the mounting shaft and the inner hole of the main shaft of the processing equipment during installation and rotation.

[0016] The double-transition fillet structure eliminates the stress concentration problem on the right-angle edges of traditional stepped shafts. Finite element analysis has proven that it can reduce contact stress by 30%-40%, effectively preventing fatigue cracks or fractures caused by stress concentration when the mounting shaft rotates at high speeds (e.g., 10,000-20,000 rpm), thereby extending the overall life of the tool.

[0017] The inner wall of the heat dissipation channel is provided with spiral guide lines with a pitch of 0.3-0.6mm. The spiral guide lines can guide the cutting fluid to form a spiral flow in the internal flow channel, increasing the contact area and contact time between the cutting fluid and the interior of the tool, and improving heat dissipation efficiency.

[0018] Through laser etching, electrolytic machining, or micro-milling, spiral guide lines with a pitch of 0.3-0.6mm (e.g., right-handed or left-handed structures, with a depth of 0.1-0.2mm) are machined into the inner wall of the heat dissipation channel. These lines are evenly distributed along the channel axis, forming a synergistic guide structure with the tapered channel (Claim 5). After the cutting fluid flows into the first heat dissipation port, it is guided by the spiral lines to generate a rotating flow, accelerated through the tapered channel, and ejected from the second heat dissipation port. The spiral flow increases the contact area between the cutting fluid and the inner wall of the channel by 20%-30% and extends the contact time by 15%-20%.

[0019] The blade particles are coated with a composite coating, which comprises a titanium aluminum nitride layer coated on the surface of the blade particles, a transition layer coated on the titanium aluminum nitride layer, and a diamond-like carbon layer coated on the transition layer.

[0020] A 2-5 μm thick titanium aluminum nitride (TiAlN) layer is deposited on the blade surface via physical vapor deposition (PVD), forming a high-hardness (HV3000-3500) wear-resistant substrate. Ion plating is used to deposit a 0.5-1 μm transition layer (e.g., a Cr / CrN gradient structure) to mitigate the difference in thermal expansion coefficients between the TiAlN layer and the diamond-like carbon (DLC) layer. Finally, a 1-3 μm thick DLC layer is deposited via plasma-enhanced chemical vapor deposition (PECVD) at 300-400°C, using a controlled acetylene to hydrogen flow ratio of 1:3 and a deposition pressure of 0.5-1.0 Pa. These three layers create a gradient hardness structure.

[0021] The transition layer includes a pure metal chromium (Cr) layer with a thickness of about 0.2-0.5 μm, which is tightly attached to the surface of the TiAlN layer by ion plating technology. The lattice matching degree between Cr and TiAlN is high (the thermal expansion coefficient is about 6.5×10 -6 / ℃, close to 7×10 -6 / ℃), which can form a strong metallic bond and avoid interface cracking. The chromium nitride (CrN) layer attached to Cr is about 0.3-0.5μm thick. By gradually introducing nitrogen (N2) during the deposition process, a CrN ceramic phase is formed; the hardness of CrN (HV1200-1500) is between TiAlN (HV3000+) and DLC (HV2000-3000), and the thermal expansion coefficient (about 9×10 -6 / ℃) is close to DLC (6-8×10 -6 / ℃), forming a "buffer zone" between hardness and thermal performance.

[0022] A method for manufacturing a high-gloss mobile phone camera plunge milling and discarding tool, characterized by the following steps:

[0023] S1. Manufacturing the Toolholder: Selecting a metal raw material, rough-processing the handle raw material using a lathe to initially form the handle's outline, including the handle's main body, bottom receiving groove, and mounting shaft. Using a milling machine, process the first threaded hole and first countersunk hole in the receiving groove.

[0024] S2. Manufacturing the cutter body: Select cemented carbide and perform rough milling on the cemented carbide blank to form the mounting portion of the cutter body and the prototype of the cutter pellet. Pre-process a second countersunk hole and a second threaded hole in the mounting portion, open a notch at the free end of the cutter pellet, and machine a first blade portion and a first holding portion in the notch;

[0025] S3. Cutter Body Finishing: By adjusting the angle of the milling tool, an inclined guide surface is machined on the side of the first cutting edge. A heat dissipation channel is created on the side of the blade using a laser processing mechanism. The inner wall of the heat dissipation channel is laser-etched to create a spiral guide pattern.

[0026] S4. Blade surface treatment: Using physical vapor deposition technology, a titanium aluminum nitride layer is deposited on the blade surface. Ion plating technology is used to deposit a transition layer on the titanium aluminum nitride layer. Using chemical vapor deposition technology, a diamond-like carbon layer is deposited on the transition layer.

[0027] S5. Assemble the components; insert the mounting portion of the cutter body into the receiving groove of the cutter handle, aligning the second threaded hole coaxially with the first threaded hole; place an elastic washer in the second countersunk hole, and use a torque wrench to screw the screw into the first threaded hole, applying a torque of 0.8 to 1.2 N·m until the screw head sinks into the second countersunk hole and is flush with the surface of the cutter body.

[0028] The diamond-like carbon layer is deposited using a plasma-enhanced chemical vapor deposition process with a deposition temperature of 300-400°C, an acetylene to hydrogen flow ratio of 1:3, and a deposition pressure of 0.5-1.0 Pa.

[0029] The toolholder is made of metal (such as high-speed steel or carbide), with a receiving slot, threaded holes, and countersunk holes machined on lathes and milling machines to form a composite positioning structure of "mounting shaft + receiving slot." This design rigidly connects the cutter body and toolholder via screws, resulting in a large contact area and high-precision fit. This design can withstand the high axial loads encountered during plunge milling, avoids the problem of traditional integrated tools being scrapped due to localized wear, and reduces operating costs.

[0030] The combined design of the countersunk hole and the elastic washer can not only accurately control the installation force (0.8~1.2N·m) through a torque wrench to avoid deformation of the cutter body due to over-tightening or vibration caused by over-loosening, but also make the screw head flush with the surface of the cutter body to prevent interference with the workpiece surface during processing and ensure the surface flatness of high-gloss processing. A heat dissipation channel is opened on the side of the cutter grain through laser processing, and a spiral guide pattern with a pitch of 0.3-0.6mm is etched on the inner wall. This design allows the cutting fluid to form a spiral flow in the flow channel, significantly increasing the contact area and residence time between the fluid and the inner wall of the tool (compared to a straight-tube flow channel, the heat exchange efficiency is increased by more than 30%), enhancing the conduction and removal of cutting heat, suppressing thermal deformation of the tool caused by high temperature, and extending its service life. It is especially suitable for high-speed, high-load continuous processing scenarios.

[0031] The titanium aluminum nitride layer (TiAlN) is deposited by physical vapor deposition (PVD) process, with a hardness of up to HV3000+ and high temperature oxidation resistance of 1100°C. It can effectively protect the blade from chemical wear during high temperature cutting (such as adhesive wear with aluminum alloy). At the same time, its low friction coefficient (0.3-0.4) reduces cutting resistance and is suitable for processing non-ferrous metals such as aluminum and copper.

[0032] The pure chromium layer (Cr) has a thickness of 0.2-0.5 μm and forms a strong metal bond with the TiAlN layer through ion plating. The thermal expansion coefficients of Cr and TiAlN are close (6.5×10-6 / ℃vs.7×10 -6 / ℃), with high lattice matching, it can eliminate stress concentration at the coating interface and avoid the problems of traditional single coating being prone to cracking and peeling.

[0033] Chromium nitride layer (CrN): thickness 0.3-0.5μm, hardness HV1200-1500, between TiAlN and diamond-like carbon layer (DLC), forming a hardness gradient buffer zone. Its thermal expansion coefficient (9×10 -6 / ℃) is close to DLC (6-8×10 -6 / ℃), further reducing the adhesion stress of the DLC layer and improving the overall bonding strength of the multi-layer coating.

[0034] Diamond-like carbon (DLC) layer: Deposited using a plasma-enhanced chemical vapor deposition (PECVD) process at a low temperature of 300-400°C, this prevents softening of the carbide substrate caused by high-temperature annealing. Optimized process parameters—an acetylene to hydrogen flow ratio of 1:3 and a pressure of 0.5-1.0 Pa—achieve a DLC layer hardness of HV2000-3000 and a low coefficient of friction of 0.05-0.1. This layer combines high wear resistance with self-lubrication, significantly reducing tool sticking during aluminum alloy machining and ensuring a workpiece surface roughness of Ra ≤ 0.2μm, meeting the high finish requirements of mobile phone camera modules.

[0035] Beneficial effects of the present invention: The present invention forms a comprehensive performance improvement mechanism of "stable structure - smooth chip removal - efficient heat dissipation - wear resistance and vibration resistance" through the multi-technical collaboration of modular threaded connection between the tool handle and the tool body, the vertical structure of "pressing and cutting" of the tool particles, inclined guide surface chip removal, tapered heat dissipation channel with spiral guide lines, double transition fillet stress optimization of the mounting shaft and titanium aluminum nitride layer / transition layer / diamond-like carbon layer gradient coating system. It has the advantages of stable structure and anti-interference, precise processing and smooth surface, high chip removal and heat dissipation efficiency, long tool life and strong process compatibility, and is suitable for high-gloss and efficient processing of precision components such as mobile phone cameras. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure of structure A in the middle;

[0038] Figure 3 An exploded view of the entire present invention;

[0039] Figure 4 It is a structural schematic diagram of the knife body of the present invention;

[0040] Figure 5 It is a structural schematic diagram of the knife handle of the present invention;

[0041] Figure 6 is a cross-sectional view of the knife body of the present invention;

[0042] Figure 7 Schematic diagram of the structure of the composite coating of the present invention;

[0043] Figure 8 It is a flow chart of the production method of the present invention.

[0044] Reference numerals include:

[0045] 1. Tool handle; 2. Tool body; 3. Fastener; 4. Receiving groove; 5. First threaded hole; 6. Second threaded hole; 7. Mounting portion; 8. Tool grain; 9. Notch; 11. First blade portion; 12. First holding portion; 13. Inclined guide surface; 14. First countersunk hole; 15. Second countersunk hole; 16. Elastic gasket; 18. First heat dissipation vent; 19. Second heat dissipation vent; 21. Internal flow channel; 22. Mounting shaft; 23. First shaft body; 24. Clamping portion; 25. First boss; 26. Second boss; 27. First transition fillet; 28. Second transition fillet; 29. ​​Spiral flow guide pattern; 31. Composite coating; 32. Titanium aluminum nitride layer; 33. Transition layer; 34. Diamond-like carbon layer; 100. External component. DETAILED DESCRIPTION

[0046] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0047] See also Figures 1 to 8 As shown, a high-gloss mobile phone camera plunge milling and discarding tool of the present invention includes a tool handle 1, a tool body 2 and a fastener 3. The bottom of the tool handle 1 is provided with a receiving groove 4, and a first threaded hole 5 is opened in the receiving groove 4. The tool body 2 is provided with a second threaded hole 6. The fastener 3 is installed on the first threaded hole 5 of the tool handle 1 through the second threaded hole 6 on the tool body 2 to fix the tool body 2 on the tool handle 1; the tool body 2 includes a mounting portion 7 and a blade 8 integrally formed with the mounting portion 7. When the tool handle 1 rotates, the blade 8 on the mounting portion 7 contacts the processing surface of the external component 100 to perform a cutting operation;

[0048] The free end of the blade 8 is provided with a notch 9, and a first blade portion 11 and a first pressing portion 12 integrally formed with the first blade portion 11 are provided at the notch 9. The angle between the first pressing portion 12 and the first blade portion 11 is 0-180°. Preferably, the angle between the first pressing portion 12 and the first blade portion 11 is 90°. The first pressing portion 12 is used to press the external component 100, and the first blade portion 11 performs a cutting operation on the side of the external component 100.

[0049] The mounting portion 7 of the blade body 2 is embedded in the receiving groove 4 at the bottom of the handle 1, and is connected to the first threaded hole 5 of the handle 1 through the second threaded hole 6 of the blade body 2 by a fastener 3 (such as a screw), so as to achieve a stable assembly of the blade body 2 and the handle 1; the blade 8 and the mounting portion 7 are integrally formed, and the notch 9 at the free end forms a first blade portion 11 and a first holding portion 12 that are perpendicular to each other. During cutting, the first holding portion 12 first contacts and holds the surface of the external component 100, providing a stable support base for the first blade portion 11, and then the blade portion performs precise cutting on the side of the component. This design brings significant beneficial effects: in terms of structural stability, the integrally formed blade 8 and mounting portion 7 enhance the overall strength of the cutting structure and reduce vibration deformation during high-speed rotation; in terms of processing accuracy, the vertically arranged holding portion and the blade portion form a "holding-cutting" linkage structure, and the holding portion can effectively offset the lateral displacement caused by the cutting force, ensuring that the blade portion accurately cuts along the predetermined trajectory and avoids processing deviations caused by workpiece shaking.

[0050] The blade 8 is further provided with an inclined guide surface 13 , which is arranged on the side of the first blade portion 11 . The inclined guide surface 13 forms an angle of 15°-30° with the axis of the blade 8 , and forms a chip removal path.

[0051] An inclined guide surface 13 is machined on the side of the first blade portion 11, forming an angle of 15°-30° with the axis of the blade grain 8, forming a continuous chip removal path. When the tool rotates at high speed, the inclined guide surface 13 uses its specific angle to guide the chips generated during the cutting process to be discharged along the inclined surface, preventing the chips from being trapped between the blade and the machined surface. This design has significant beneficial effects: chip removal efficiency is improved, and the diversion effect of the inclined guide surface 13 allows chips to quickly escape from the cutting area, reducing scratches on the machined surface or tool clogging caused by chip accumulation; processing quality is optimized, and the smooth discharge of chips reduces secondary friction between the blade and the chips. Combined with the stable support of the holding portion, it can effectively improve the finish and precision of the machined surface; tool life is extended, and the inclined guide surface 13 reduces the compression and wear of chips on the blade, while also reducing the local accumulation of cutting heat. Especially under the high-precision requirements of high-gloss surface processing, it can significantly improve the durability of the tool, reduce the frequent tool changes caused by edge wear, and improve production efficiency.

[0052] The fastener 3 is a screw, the accommodating groove 4 is provided with a first countersunk hole 14, the first threaded hole 5 is connected to the first countersunk hole 14, the cutter body 2 is provided with a second countersunk hole 15, the second countersunk hole 15 is connected to the second threaded hole 6; the depth of the first countersunk hole 14 is the same as the depth of the mounting portion 7 of the cutter body 2, the depth of the second countersunk hole 15 is the same as the depth of the screw head, and the screw head is flush with the surface of the cutter body 2 after sinking into the second countersunk hole 15.

[0053] A first countersunk hole 14 having the same depth as the mounting portion 7 of the cutter body 2 is machined in the receiving groove 4 of the tool handle 1, and a first threaded hole 5 is opened at the bottom of the countersunk hole; at the same time, a second countersunk hole 15 having a depth matching that of the screw head is machined in the mounting portion 7 of the cutter body 2, so that the second threaded hole 6 is connected to the second countersunk hole 15. During assembly, the screw is passed through the second countersunk hole 15 of the cutter body 2 and screwed into the first threaded hole 5 of the tool handle 1 until the screw head is completely sunk into the second countersunk hole 15 and is flush with the surface of the cutter body 2. This design brings significant beneficial effects: in terms of structural reliability, the precise matching of the countersunk hole depth and the component thickness allows the screw head to be flush with the surface of the cutter body 2, avoiding scratches on the workpiece or interference with the equipment due to the protrusion of the screw during processing; in terms of connection stability, the coaxial connection structure of the countersunk hole and the threaded hole ensures that the screw preload force is evenly transmitted to the fitting surface of the tool handle 1 and the cutter body 2.

[0054] An elastic washer 16 is provided between the screw head and the second countersunk hole 15 . The outer diameter of the elastic washer 16 is larger than the diameter of the second countersunk hole 15 and smaller than the annular step on the outer edge of the second countersunk hole 15 , so as to prevent the screw from loosening and evenly distribute the pre-tightening force.

[0055] During assembly, first place elastic washer 16 in second countersunk hole 15. Its outer diameter is slightly larger than the countersunk hole diameter, so that the washer edge engages below the annular step on the outer edge of second countersunk hole 15. Then, screws are threaded through the washer into second threaded hole 6 and first threaded hole 5. The elastic washer 16 elastically deforms under the preload of the screw, fitting tightly against the screw head, the bottom surface of the countersunk hole, and the step surface. This design brings significant beneficial effects: anti-loosening mechanism, the elastic restoring force of the elastic washer 16 forms a continuous friction force between the screw head and the countersink, effectively offsetting the axial loosening trend caused by high-speed cutting vibration, and avoiding the displacement or falling off of the tool body 2 due to loosening of the screw; preload force is uniformed, the flexible contact characteristics of the washer can evenly distribute the preload force of the screw to the surface of the tool body 2, preventing deformation or cracks of the mounting part 7 caused by local stress concentration, and improving the reliability of the connection between the tool handle 1 and the tool body 2; dynamic stability is enhanced, in a high-frequency vibration processing environment, the buffering effect of the elastic washer 16 can absorb the impact load during the cutting process, reduce the rigid collision between the fastener 3 and the countersink, and extend the service life of the screw, countersink and annular step, which is especially suitable for high-precision high-gloss surface processing scenarios, ensuring the stability and consistency of the tool structure during long-term processing.

[0056] The blade body 2 is also provided with a heat dissipation channel for filling cutting fluid, and the heat dissipation channel includes a first heat dissipation port 18 opened on the side of the blade particle 8, a second heat dissipation port 19 on the bottom surface of the first pressing portion 12, and an internal flow channel 21 connecting the first heat dissipation port 18 and the second heat dissipation port 19; the first heat dissipation port 18 is an elliptical through hole with a major axis diameter of 1.2-2.0 mm and a minor axis diameter of 0.8-1.5 mm; the second heat dissipation port 19 is a circular through hole with a diameter of 0.6-1.0 mm; the aperture of the internal flow channel 21 gradually decreases from the first heat dissipation port 18 to the second heat dissipation port 19.

[0057] The tapered flow channel uses the Venturi effect to increase the flow rate of the cutting fluid, enhance the heat exchange efficiency with the blade 8, quickly remove the heat generated during the cutting process, and prevent the blade 8 from softening or thermal deformation due to high temperature. It is particularly suitable for precision components that are sensitive to temperature in high-gloss processing. The elliptical first heat dissipation port 18 expands the cutting fluid suction area, and the circular second heat dissipation port 19 is precisely aligned with the contact area between the blade and the processing surface. The high-speed ejection of cutting fluid can effectively flush the chips, and cooperate with the inclined guide surface 13 to form a double chip removal path to prevent surface scratches caused by chip retention.

[0058] The end of the tool handle 1 away from the tool body 2 is provided with a mounting shaft 22, and the mounting shaft 22 includes a first shaft body 23, and the end of the first shaft body 23 away from the tool handle 1 is provided with a clamping portion 24; the clamping portion 24 includes a first boss 25 and a second boss 26 arranged on the first boss 25, the diameter of the first boss 25 is greater than the diameter of the second boss 26, the second boss 26 is connected to the first boss 25 through a first transition fillet 27, and a second transition fillet 28 is provided on the top of the second boss 26. The first transition fillet 27 and the second transition fillet 28 can reduce the contact stress between the mounting shaft 22 and the inner hole of the main shaft of the processing equipment during installation and rotation.

[0059] The double-transition fillet structure eliminates the stress concentration problem on the right-angle edge of the traditional stepped shaft. Finite element analysis has proven that it can reduce contact stress by 30%-40%, effectively preventing fatigue cracks or fractures caused by stress concentration when the mounting shaft 22 rotates at high speeds (e.g., 10,000-20,000 rpm), thereby extending the overall life of the tool.

[0060] The inner wall of the inner flow channel 21 of the heat dissipation channel is provided with spiral guiding lines 29, with a pitch of 0.3-0.6mm. The spiral guiding lines 29 can guide the cutting fluid to form a spiral flow within the inner flow channel 21, increasing the contact area and contact time between the cutting fluid and the interior of the tool, thereby improving heat dissipation efficiency.

[0061] Through laser etching, electrochemical machining, or micro-milling, spiral guide lines 29 (e.g., right-handed or left-handed structures, with a depth of 0.1-0.2 mm) are machined into the inner wall of the heat dissipation channel 21. These lines are evenly distributed along the channel axis, forming a synergistic guide structure with the tapered channel (Claim 5). After the cutting fluid flows into the first heat dissipation port 18, it is guided by the spiral lines to generate a rotating flow. After being accelerated in the tapered channel, it is ejected from the second heat dissipation port 19. This spiral flow increases the contact area between the cutting fluid and the inner wall of the channel by 20%-30% and extends the contact time by 15%-20%.

[0062] The blade particle 8 is coated with a composite coating 31 , which includes a titanium aluminum nitride layer 32 coated on the surface of the blade particle 8 , a transition layer 33 coated on the titanium aluminum nitride layer 32 , and a diamond-like carbon layer 34 coated on the transition layer 33 .

[0063] A 2-5 μm thick titanium aluminum nitride (TiAlN) layer is deposited on the blade 8 via physical vapor deposition (PVD), forming a high-hardness (HV 3000-3500) wear-resistant substrate. Ion plating is used to deposit a 0.5-1 μm thick transition layer 33 (e.g., a Cr / CrN gradient structure) to mitigate the difference in thermal expansion coefficients between the TiAlN layer and the diamond-like carbon (DLC) layer 34. Finally, a 1-3 μm thick DLC layer is deposited via plasma-enhanced chemical vapor deposition (PECVD) at 300-400°C, using a controlled acetylene to hydrogen flow ratio of 1:3 and a deposition pressure of 0.5-1.0 Pa. These three layers create a gradient hardness structure.

[0064] The transition layer 33 comprises a pure metal chromium (Cr) layer with a thickness of about 0.2-0.5 μm, which is tightly attached to the surface of the TiAlN layer by ion plating technology. The lattice matching degree between Cr and TiAlN is high (the thermal expansion coefficient is about 6.5×10 -6 / ℃, close to 7×10 -6 / ℃), which can form a strong metallic bond and avoid interface cracking. The chromium nitride (CrN) layer attached to Cr is about 0.3-0.5μm thick. By gradually introducing nitrogen (N2) during the deposition process, a CrN ceramic phase is formed; the hardness of CrN (HV1200-1500) is between TiAlN (HV3000+) and DLC (HV2000-3000), and the thermal expansion coefficient (about 9×10 -6 / ℃) is close to DLC (6-8×10 -6 / ℃), forming a "buffer zone" between hardness and thermal performance.

[0065] A method for manufacturing a high-gloss mobile phone camera plunge milling and discarding tool, characterized by the following steps:

[0066] S1. Manufacturing the tool handle 1: Select a metal raw material and perform rough machining on the tool handle 1 using a lathe to initially form the outer contour of the tool handle 1, including the main body of the tool handle 1, the bottom receiving groove 4, and the mounting shaft 22. Use a milling machine to machine the first threaded hole 5 and the first countersunk hole 14 in the receiving groove 4;

[0067] S2. Manufacturing the cutter body 2: Select cemented carbide and perform rough milling on the cemented carbide blank to form the prototype of the mounting portion 7 and the blade pellet 8 of the cutter body 2. Pre-process the second countersunk hole 15 and the second threaded hole 6 in the mounting portion 7, open a notch 9 at the free end of the blade pellet 8, and process the first blade portion 11 and the first holding portion 12 at the notch 9;

[0068] S3. Finishing of the cutter body 2: By adjusting the angle of the milling tool, the inclined guide surface 13 is processed on the side of the first blade portion 11, a laser processing mechanism is used to open a heat dissipation channel on the side of the cutter grain 8, and a spiral guide pattern 29 is processed on the inner wall of the heat dissipation channel by laser etching;

[0069] S4. Surface treatment of the blade 8: a titanium aluminum nitride layer 32 is deposited on the surface of the blade 8 by physical vapor deposition, a transition layer 33 is deposited on the titanium aluminum nitride layer 32 by ion plating, and a diamond-like carbon layer 34 is deposited on the transition layer 33 by chemical vapor deposition;

[0070] S5. Assembly of the components; insert the mounting portion 7 of the cutter body 2 into the receiving groove 4 of the shank 1 so that the second threaded hole 6 is coaxially aligned with the first threaded hole 5; place the elastic washer 16 in the second countersunk hole 15, and use a torque wrench to screw the screw into the first threaded hole 5, applying a torque of 0.8 to 1.2 N·m so that the screw head sinks into the second countersunk hole 15 and is flush with the surface of the cutter body 2.

[0071] The diamond-like carbon layer 34 is deposited using a plasma enhanced chemical vapor deposition process with a deposition temperature of 300-400° C., an acetylene to hydrogen flow ratio of 1:3, and a deposition pressure of 0.5-1.0 Pa.

[0072] The tool holder 1 is made of metal (such as high-speed steel or carbide), and is machined using a lathe and milling machine to form a receiving slot 4, a threaded hole, and a countersunk hole, forming a composite positioning structure consisting of a "mounting shaft 22 + receiving slot 4." This design rigidly connects the tool body 2 and tool holder 1 via screws, resulting in a large contact area and high-precision fit. This design can withstand the high axial loads encountered during plunge milling, avoids the problem of traditional integrated tools being scrapped due to localized wear, and reduces operating costs.

[0073] The combined design of the countersunk hole and the elastic washer 16 can not only accurately control the installation force (0.8 to 1.2 N·m) through a torque wrench to avoid deformation of the cutter body 2 due to overtightening or vibration caused by overloosening, but also make the screw head flush with the surface of the cutter body 2 to prevent interference with the workpiece surface during processing and ensure the surface flatness of high-gloss processing. A heat dissipation channel is opened on the side of the cutter grain 8 by laser processing, and a spiral guide pattern 29 with a pitch of 0.3-0.6mm is etched on the inner wall. This design allows the cutting fluid to form a spiral flow in the flow channel, significantly increasing the contact area and residence time between the fluid and the inner wall of the tool (compared to a straight-tube flow channel, the heat exchange efficiency is increased by more than 30%), enhancing the conduction and removal of cutting heat, suppressing thermal deformation of the tool caused by high temperature, and extending its service life. It is especially suitable for high-speed, high-load continuous processing scenarios.

[0074] The titanium aluminum nitride layer 32 (TiAlN) is deposited by physical vapor deposition (PVD) technology, with a hardness of up to HV3000+ and a high-temperature oxidation resistance of 1100°C. It can effectively protect the blade 8 from chemical wear during high-temperature cutting (such as adhesive wear with aluminum alloy). At the same time, its low friction coefficient (0.3-0.4) reduces cutting resistance and is suitable for processing non-ferrous metals such as aluminum and copper.

[0075] The pure chromium layer (Cr) has a thickness of 0.2-0.5 μm and forms a strong metal bond with the TiAlN layer through ion plating. The thermal expansion coefficients of Cr and TiAlN are close (6.5×10 -6 / ℃vs.7×10 -6 / ℃), with high lattice matching, it can eliminate stress concentration at the coating interface and avoid the problems of traditional single coating being prone to cracking and peeling.

[0076] Chromium nitride layer (CrN): thickness 0.3-0.5μm, hardness HV1200-1500, between TiAlN and diamond-like carbon layer 34 (DLC), forming a hardness gradient buffer zone. Its thermal expansion coefficient (9×10 -6 / ℃) is close to DLC (6-8×10 -6 / ℃), further reducing the adhesion stress of the DLC layer and improving the overall bonding strength of the multi-layer coating.

[0077] Diamond-like Carbon (DLC) layer 34: Deposited using a plasma-enhanced chemical vapor deposition (PECVD) process at a low temperature of 300-400°C, this prevents softening of the carbide substrate caused by high-temperature annealing. Optimized process parameters—an acetylene to hydrogen flow ratio of 1:3 and a pressure of 0.5-1.0 Pa—result in a DLC layer with a hardness of HV2000-3000 and a low coefficient of friction of 0.05-0.1. This layer combines high wear resistance with self-lubrication, significantly reducing tool sticking during aluminum alloy machining and ensuring a workpiece surface roughness of Ra ≤ 0.2μm, meeting the high finish requirements of mobile phone camera modules.

[0078] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A high-gloss mobile phone camera plunge milling and discarding tool, characterized by: The invention comprises a knife handle (1), a knife body (2) and a fastener (3); the knife handle (1) is provided with a receiving groove (4) at the bottom thereof, a first threaded hole (5) is provided in the receiving groove (4), a second threaded hole (6) is provided on the knife body (2), and the fastener (3) is installed on the first threaded hole (5) of the knife handle (1) via the second threaded hole (6) on the knife body (2) to fix the knife body (2) on the knife handle (1); the knife body (2) comprises a mounting portion (7) and a knife grain (8) integrally formed with the mounting portion (7); when the knife handle (1) rotates, the knife grain (8) on the mounting portion (7) contacts the processing surface to perform a cutting operation; The free end of the blade (8) is provided with a notch (9), and a first blade portion (11) and a first pressing portion (12) integrally formed with the first blade portion (11) are provided at the notch (9). The angle between the first pressing portion (12) and the first blade portion (11) is 0-180°. The first pressing portion (12) is used to press the external component (100), and the first blade portion (11) performs a cutting operation on the side of the external component (100).

2. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 1, characterized in that: The blade (8) is further provided with an inclined guide surface (13), which is arranged on the side of the first blade portion (11). The inclined guide surface (13) forms an angle of 15°-30° with the axis of the blade (8), and the inclined guide surface (13) forms a chip removal path.

3. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 1, characterized in that: The fastener (3) is a screw, the accommodating groove (4) is provided with a first countersunk hole (14), the first threaded hole (5) is connected to the first countersunk hole (14), the knife body (2) is provided with a second countersunk hole (15), and the second countersunk hole (15) is connected to the second threaded hole (6); the depth of the first countersunk hole (14) is the same as the depth of the mounting portion (7) of the knife body (2), the depth of the second countersunk hole (15) is the same as the depth of the screw head, and the screw head is flush with the surface of the knife body (2) after sinking into the second countersunk hole (15).

4. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 3, characterized in that: An elastic washer (16) is provided between the screw head and the second countersunk hole (15). The outer diameter of the elastic washer (16) is larger than the diameter of the second countersunk hole (15) and smaller than the annular step on the outer edge of the second countersunk hole (15), and is used to prevent the screw from loosening and evenly distribute the pre-tightening force.

5. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 1, characterized in that: The blade body (2) is also provided with a heat dissipation channel for filling cutting fluid, the heat dissipation channel comprising a first heat dissipation port (18) provided on the side of the blade particle (8), a second heat dissipation port (19) on the bottom surface of the first holding portion (12), and an internal flow channel (21) connecting the first heat dissipation port (18) and the second heat dissipation port (19); the first heat dissipation port (18) is an elliptical through hole with a major axis diameter of 1.2-2.0 mm and a minor axis diameter of 0.8-1.5 mm; the second heat dissipation port (19) is a circular through hole with a diameter of 0.6-1.0 mm; the aperture of the internal flow channel (21) gradually decreases from the first heat dissipation port (18) to the second heat dissipation port (19).

6. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 1, characterized in that: The end of the tool handle (1) away from the tool body (2) is provided with a mounting shaft (22), and the mounting shaft (22) includes a first shaft body (23), and the end of the first shaft body (23) away from the tool handle (1) is provided with a clamping portion (24); the clamping portion (24) includes a first boss (25) and a second boss (26) arranged on the first boss (25), the diameter of the first boss (25) is larger than the diameter of the second boss (26), the second boss (26) and the first boss (25) are connected through a first transition fillet (27), and the top of the second boss (26) is provided with a second transition fillet (28), and the first transition fillet (27) and the second transition fillet (28) can reduce the contact stress between the mounting shaft (22) and the inner hole of the main shaft of the processing equipment during the installation and rotation process.

7. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 5, characterized in that: The inner wall of the internal flow channel (21) of the heat dissipation channel is provided with a spiral guide pattern (29), and the pitch of the spiral guide pattern (29) is 0.3-0.6 mm; the spiral guide pattern (29) can guide the cutting fluid to form a spiral flow in the internal flow channel (21), thereby increasing the contact area and contact time between the cutting fluid and the interior of the tool, and improving the heat dissipation efficiency.

8. The high-gloss mobile phone camera plunge milling and discarding tool according to claim 1, characterized in that: The blade particle (8) is coated with a composite coating (31), which comprises a titanium aluminum nitride layer (32) coated on the surface of the blade particle (8), a transition layer (33) coated on the titanium aluminum nitride layer (32), and a diamond-like carbon layer (34) coated on the transition layer (33).

9. A method for manufacturing a high-gloss mobile phone camera plunge milling and discarding tool, characterized in that: Here are the steps: S1. Manufacturing the tool handle (1): selecting a metal raw material, using a lathe to perform rough processing on the tool handle (1) raw material, and initially forming the outer contour of the tool handle (1), including the main body of the tool handle (1), the bottom receiving groove (4) and the mounting shaft (22), and using a milling machine to process the first threaded hole (5) and the first countersunk hole (14) in the receiving groove (4); S2. Manufacturing the cutter body (2): Selecting cemented carbide, rough-machining the cemented carbide blank by milling to form the prototype of the mounting portion (7) and the cutter grain (8) of the cutter body (2), pre-machining a second countersunk hole (15) and a second threaded hole (6) in the mounting portion (7), opening a notch (9) at the free end of the cutter grain (8), and machining a first blade portion (11) and a first holding portion (12) at the notch (9); S3. Finishing of the cutter body (2): by adjusting the angle of the milling tool, an inclined guide surface (13) is machined on the side of the first blade portion (11), a heat dissipation channel is opened on the side of the cutter grain (8) by a laser processing mechanism, and a spiral guide pattern (29) is machined on the inner wall of the heat dissipation channel by a laser etching process; S4. Surface treatment of the blade (8): depositing a titanium aluminum nitride layer (32) on the surface of the blade (8) by physical vapor deposition, depositing a transition layer (33) on the titanium aluminum nitride layer (32) by ion plating, and depositing a diamond-like carbon layer (34) on the transition layer (33) by chemical vapor deposition; S5. Assembly of the components; embed the mounting portion (7) of the blade body (2) into the receiving groove (4) of the blade handle (1) so that the second threaded hole (6) is coaxially aligned with the first threaded hole (5); place an elastic washer (16) in the second countersunk hole (15), use a torque wrench to screw the screw into the first threaded hole (5), apply a torque of 0.8 to 1.2 N·m, and make the screw head sink into the second countersunk hole (15) and be flush with the surface of the blade body (2).

10. The method for manufacturing a high-gloss mobile phone camera plunge milling and discarding tool according to claim 9, characterized in that: The diamond-like carbon layer (34) in S4 is deposited by a plasma enhanced chemical vapor deposition process, with a deposition temperature of 300-400° C., an acetylene to hydrogen flow ratio of 1:3, and a deposition pressure of 0.5-1.0 Pa.

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