A flat-bottom plow cutter for preparing spiral microneedles and a processing technology thereof

Abstract

The present application belongs to the technical field of heat dissipation microneedle processing, and relates to a flat-bottom ploughing cutter for preparing spiral microneedles and a processing technology thereof. The present application comprises a cutter handle and a ploughing cutter arranged at the bottom of the cutter handle. The bottom of the cutting part of the ploughing cutter is provided with a plurality of ploughing cutter edges in the vertical direction and parallel to each other. The ploughing cutter edge is prismatic, the vertical longitudinal section thereof is a right-angled trapezoid, the horizontal cross section thereof is an isosceles triangle, and the included angle between the edge and the vertical line passing through the edge tip is an acute angle. The workpiece is clamped on the planer workbench, the cutter is clamped on the planer ram, the ploughing depth, back cutting depth and feeding speed are preset, the ploughing cutter travels at a uniform speed along the feeding path, and a continuous and uniform spiral microneedle array with horizontal axis is integrally formed. The present application realizes the continuous forming of spiral microneedles by means of the flat-bottom ploughing edge with inclined negative rake angle and the back cutting cutter, and the heat exchange area and the convective heat transfer coefficient of the heat dissipation matrix can be effectively improved without complex molds.

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation microneedle processing technology, and relates to a flat-bottomed plow-cutting tool for preparing spiral microneedles and its processing technology. Background Technology

[0002] With the rapid development of power semiconductors, highly integrated chips, new energy vehicle electronic control systems, and 5G communication devices, electronic devices are rapidly iterating towards higher integration, higher power density, and miniaturization, leading to a sharp increase in heat flux density during operation. Thermal failure has become a core bottleneck restricting the performance improvement, operational stability, and service life of electronic devices. Air cooling solutions remain the most widely used heat dissipation method in industrial applications due to their advantages such as simple structure, reliable operation, convenient maintenance, and wide applicability. The enhanced heat transfer microstructure on the surface of the heat dissipation substrate directly determines the heat dissipation efficiency.

[0003] Microneedle-shaped fin structures have become an important development direction for heat dissipation solutions of high power density devices due to their larger specific surface area, stronger fluid disturbance capability, and better space utilization. Currently, most commonly used microneedles are straight structures such as cylindrical, prismatic, or conical shapes. However, within a limited substrate surface area, the heat transfer area of ​​such structures can only be increased to a limited extent, and the disturbance effect on the fluid boundary layer is insufficient, making it difficult to meet the extreme heat dissipation requirements in ultra-high heat flux density scenarios. As a novel heat transfer-enhancing microstructure, helical microneedles can significantly increase the effective heat transfer area without increasing the axial height of the microneedle or the area occupied by the substrate. At the same time, their continuous helical morphology can actively disrupt the fluid flow boundary layer, enhance the near-wall fluid turbulence, and significantly improve the convective heat transfer coefficient. However, the complex three-dimensional morphology of helical microneedles places extremely high demands on the forming and processing technology. Existing metal microneedle forming processes are difficult to achieve high-precision, high-consistency, and low-cost large-scale preparation of helical microneedles.

[0004] In the mass production of microneedles on metal heat sink substrates, the multi-blade ploughing process has become a microneedle processing technology with industrialization potential due to its advantages such as high processing efficiency, wide range of applicable materials, controllable forming precision, no need for complex supporting equipment, and the ability to directly form microneedles on the heat sink substrate surface in one piece. For example... Figure 9 As shown, existing plowing processes mostly use ordinary oblique-blade plowing cutters, i.e., vertical V-shaped plowing cutters. These processes suffer from uneven force on the cutting edge, poor controllability of chip formation, and a tendency to produce burrs, chipping, and microneedle structure deformation. They struggle to control the outward turning angle and continuous spiral morphology during microneedle processing, and cannot produce spiral microneedles with complete structures and uniform morphology. This fails to meet both high-precision processing requirements and the needs of large-scale mass production of heat dissipation devices.

[0005] Therefore, how to provide a processing technology and special tools that can achieve high-precision, high-consistency, and low-cost integrated molding of spiral microneedles has become an urgent technical problem to be solved in the field of metal surface micromachining. Summary of the Invention

[0006] To address the challenges of controlling the outward turning angle and continuous spiral morphology during the microneedle fabrication process in existing technologies, which prevent the production of spiral microneedles with complete structures and uniform morphology, thus failing to meet both high-precision processing requirements and the needs of mass production of spiral microneedle heat dissipation devices, this invention proposes a flat-bottomed plow-cutting tool for fabricating spiral microneedles, comprising: a tool holder; and a plow-cutting blade disposed at the bottom of the tool holder.

[0007] The tool holder includes a tool holder and tool post mounting part and a tool holder and cutting edge mounting part; the tool holder and cutting edge mounting part is located at the bottom of the tool holder and tool post mounting part;

[0008] The plow cutter includes a plow cutter mounting part and a plow cutter cutting part; the plow cutter cutting part is located on one side of the plow cutter mounting part; the plow cutter mounting part is threadedly connected to the tool holder mounting part.

[0009] The bottom of the cutting part of the plow cutter is provided with several vertically parallel plow cutting blades; the plow cutting blades are prismatic, their vertical longitudinal section is a right trapezoid, and their horizontal cross section at the cutting edge is an isosceles triangle; the angle between the cutting edge and the perpendicular line passing through the cutting tip is an acute angle.

[0010] According to the above-described flat-bottomed plowshare cutter for preparing spiral microneedles, the plowshare mounting part of the plowshare cutter is cubic in shape; the top of the plowshare mounting part is provided with a first plowshare mounting through hole, and its side wall is provided with a second plowshare mounting through hole and a third plowshare mounting through hole; the axis of the second plowshare mounting through hole is parallel to the axis of the third plowshare mounting through hole; the axis of the first plowshare mounting through hole is perpendicular to the axis of the second plowshare mounting through hole.

[0011] A plow cutter guide is provided between the plow cutter mounting part and the plow cutter cutting part; the plow cutter guide is a rectangular structure, and the plow cutter is positioned by one side of the plow cutter guide being attached to the corresponding side wall of the vertical mounting part of the plow cutter handle;

[0012] The vertical longitudinal section of the plow cutter's cutting part is a right-angled trapezoid; the parallel plow cutter blades are located at the front end of the plow cutter's cutting part; the cutting edge of the plow cutter blade is located at the bottom of the plow cutter blade.

[0013] The bottom of the plow cutter cutting part is provided with a plow cutter cutting part groove; the upper part of the plow cutter blade is located in the plow cutter cutting part groove; there is a gap between the upper surface of the plow cutter blade and the bottom surface of the plow cutter cutting part groove.

[0014] According to the above-described flat-bottomed plowshare cutter for preparing spiral microneedles, the handle and tool holder mounting part is cubic in shape; the handle and tool holder mounting part is provided with a handle and tool holder mounting hole; the handle is bolted to the planer ram through the handle and tool holder mounting hole; the handle and blade mounting part includes a horizontal mounting part and a vertical mounting part; the horizontal mounting part is located between the handle and tool holder mounting part and the vertical mounting part; the horizontal mounting part is cubic in shape, and its top is provided with a first plowshare cutter handle mounting through hole corresponding to the first plowshare cutter mounting through hole; the side wall of the vertical mounting part is provided with a second plowshare cutter handle mounting through hole and a third plowshare cutter handle mounting through hole respectively corresponding to the second plowshare cutter mounting through hole and the third plowshare cutter mounting through hole; the axis of the second plowshare cutter mounting through hole is parallel to the axis of the third plowshare cutter mounting through hole; the axis of the first plowshare cutter handle mounting through hole is perpendicular to the axis of the second plowshare cutter handle mounting through hole.

[0015] According to the above-described flat-bottomed ploughing tool for preparing spiral microneedles, the vertex angle of the isosceles triangle of the horizontal cross-section of the ploughing blade edge is 60°-70°; the angle between the ploughing blade edge and the perpendicular line passing through the blade tip is 20°-25°.

[0016] According to the above-described flat-bottomed plow-cutting tool for preparing spiral microneedles, the gap between adjacent plow-cutting blades is 0.8mm-1.0mm.

[0017] According to the above-described flat-bottomed plow-cutting tool for preparing spiral microneedles, a back-cutting blade is also provided at the bottom of the handle; the bottom surface of the cutting edge of the back-cutting blade is coplanar with the bottom surface of the plow-cutting blade.

[0018] According to the above-described flat-bottomed ploughing tool for preparing spiral microneedles, the vertical longitudinal section of the back cutter is a right-angled trapezoid; a back cutter protrusion is provided on the upper part of the right-angled trapezoidal sidewall on one side of the back cutter; the upper surface of the back cutter protrusion is coplanar with the upper surface of the back cutter; the lower surface of the back cutter protrusion is parallel to the lower surface of the back cutter; a through-type back cutter groove is provided on the lower part of the right-angled trapezoidal sidewall on one side of the back cutter.

[0019] According to the above-described flat-bottomed plowshare cutter for preparing spiral microneedles, the handle is provided with a back-cutting blade mounting part with an L-shaped cross-section; the back-cutting blade mounting part is provided with a back-cutting blade mounting part through hole corresponding to the back-cutting blade concave groove; the axis of the back-cutting blade mounting part through hole is parallel to the axis of the second plowshare mounting through hole; the side wall of the vertical mounting part of the plowshare cutter handle is provided with a back-cutting blade groove corresponding to the back-cutting blade protrusion; the back-cutting blade protrusion is disposed in the back-cutting blade groove; the upper and lower surfaces of the back-cutting blade protrusion can move horizontally along the back-cutting blade groove.

[0020] A fabrication process for helical microneedles, using a flat-bottomed ploughing tool for preparing helical microneedles as described above, includes the following steps:

[0021] Step S1: Fix the workpiece on the planer table using the workpiece fixing fixture, and calibrate the parallelism between the workpiece surface and the cutting feed direction to ensure that the parallelism is ≤0.02mm;

[0022] Step S2: Clamp the handle of the flat-bottomed plow cutter onto the planer ram, bolt the plow cutter to the handle, calibrate the perpendicularity of the trapezoidal longitudinal section of the plow cutter blade to the workpiece surface, and set the initial machining zero position.

[0023] Step S3: Preset the processing parameters, including: plowing depth of 0.15mm-0.18mm and plowing feed speed of 8m / min-10m / min;

[0024] Step S4: Start the planer and control the plow cutter to smoothly cut into the workpiece surface with preset processing parameters, and plow along the feed path at a uniform speed to process a continuous and uniform spiral micro needle array.

[0025] Step S5: After the multi-pass plowing process is completed, the flat-bottomed plowing tool is reset, the workpiece is removed and ultrasonically cleaned to remove residual chips and oil stains from the surface, resulting in a metal heat dissipation substrate with a spiral microneedle array integrally formed on the surface. The axes of each spiral microneedle in the spiral microneedle array on the metal heat dissipation substrate are horizontal.

[0026] A fabrication process for helical microneedles, using a flat-bottomed ploughing tool for preparing helical microneedles as described above, includes the following steps:

[0027] Step S1: Fix the workpiece on the planer table using the workpiece fixing fixture, and calibrate the parallelism between the workpiece surface and the cutting feed direction to ensure that the parallelism is ≤0.02mm;

[0028] Step S2: Clamp the handle of the flat-bottomed plowing cutter onto the planer ram, and bolt the plowing cutter and back cutter to the handle in sequence. Align the trapezoidal longitudinal section of the plowing cutter blade and the perpendicularity of the lower surface of the back cutter to the workpiece surface, and set the initial machining zero position.

[0029] Step S3: Preset the machining process parameters, including: plowing depth of 0.15mm-0.18mm, back cutting depth of 0.25mm-0.35mm, and plowing feed speed of 8m / min-10m / min;

[0030] Step S4: Start the planer and control the flat-bottomed plowing cutter to smoothly cut into the workpiece surface with preset parameters. The plowing cutter moves along the feed path at a uniform speed to first process a continuous, uniform, and horizontal spiral micro-needle array.

[0031] Next, the back cutter peels the spiral microneedle array off the workpiece to obtain a fin with the spiral microneedle array integrally formed on the surface; at this time, the axis of each spiral microneedle of the spiral microneedle array on the fin has an angle greater than 0° with the horizontal.

[0032] Step S5: After the multi-pass plowing process is completed, the flat-bottomed plowing cutter is reset, the fins are removed, and ultrasonic cleaning is performed to remove residual chips and oil stains from the surface.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. Achieving integrated high-precision molding of spiral microneedles significantly improves processing efficiency. Compared with existing processes using ordinary oblique-bladed plowshare cutting heads, this invention designs a plowshare cutting edge with an isosceles triangular horizontal cross-section forming an acute angle with the vertical line, combined with a prismatic cutting edge structure that is parallel to each other in the vertical direction, achieving directional extrusion and controllable plastic rheology of metal materials. The problems of uneven cutting edge force and poor controllability of chip formation in existing technologies are fundamentally solved. This invention can directly induce continuous outward turning and torsional deformation of metal during a single-pass plowshare cutting process, integrally molding a spiral microneedle array without the need for multiple processes or complex molds, significantly shortening the processing flow and improving production efficiency.

[0035] 2. Significantly improves the forming quality and consistency of spiral microneedles. Existing plowing processes are prone to problems such as burrs, edge chipping, and microneedle structural deformation, resulting in low product yield. This invention addresses these issues by creating a plowing cutter groove at the bottom of the cutting section and maintaining a gap between the upper surface of the plowing cutter blade and the bottom surface of the groove. This effectively guides chip removal, preventing secondary damage to the formed microneedles from chip accumulation. Simultaneously, the gap between adjacent plowing cutter blades is controlled at 0.8mm-1.0mm, and the blade tip angle is controlled at 60°-70°, ensuring uniform force and consistent morphology for each microneedle. The resulting spiral microneedle array has a complete structure and a smooth surface, significantly improving the yield rate.

[0036] 3. Saves raw materials and reduces subsequent processing steps. This invention integrates microneedle forming and fin processing functions on the tool holder through a composite structure of a plow cutter and a back cutter. The bottom surface of the cutting edge of the back cutter is coplanar with the bottom surface of the plow cutter, allowing the spiral microneedles to be immediately peeled from the substrate after forming, directly obtaining fins with spiral microneedles at a certain angle between the axis and the horizontal. Compared with the existing technology that first forms microneedles and then performs separate cutting or punching, this invention eliminates a separate process, avoids positioning errors caused by secondary clamping, reduces material waste, and lowers production costs.

[0037] 4. Simplified operation and control, improved process adaptability. This invention utilizes an L-shaped back-cutting blade mounting part and a back-cutting blade groove structure on the tool holder, allowing the back-cutting blade protrusion to move horizontally along the groove, achieving stepless adjustment of the back-cutting blade's lateral position. A plow-cutting blade guide part is provided between the plow-cutting blade mounting part and the plow-cutting blade cutting part; the plow-cutting blade guide part has a rectangular structure, and by having one side of the plow-cutting blade guide part conform to the corresponding side wall of the vertical mounting part of the plow-cutting blade handle, rapid positioning of the plow-cutting blade is achieved. Simultaneously, the tool holder, plow-cutting blade, and back-cutting blade are all connected by bolts, facilitating easy disassembly and assembly, and simplifying calibration. Operators only need to calibrate the perpendicularity of the plow-cutting blade edge to the workpiece surface during initial processing to achieve stable processing without frequent adjustments. Compared with existing complex tool structures, this invention is simple to operate, requires less operator skill, and is easy to promote.

[0038] 5. Significantly improves the heat transfer performance of heat dissipation devices. The spiral microneedle array formed by the processing technology of this invention has a continuous spiral morphology. Compared with the straight microneedles formed by existing technology, the effective heat transfer area is significantly increased under the same axial height and substrate area. More importantly, the spiral morphology can actively disrupt the fluid boundary layer in the air cooling process and enhance the near-wall fluid turbulence. Tests have shown that the heat dissipation substrate with spiral microneedle arrays processed by this invention has a convective heat transfer coefficient that is more than 30% higher than that of traditional straight microneedles, and has better temperature uniformity performance, which can effectively solve the bottleneck problem of thermal failure in high power density electronic devices. Attached Figure Description

[0039] Figure 1 This is a perspective view of a flat-bottomed ploughing cutter for preparing spiral microneedles according to the present invention.

[0040] Figure 2 This is a perspective view of another aspect of the structural schematic diagram of a flat-bottomed ploughing tool for preparing spiral microneedles according to the present invention.

[0041] Figure 3 This is a perspective view of the handle of a flat-bottomed ploughing tool for preparing spiral microneedles according to the present invention.

[0042] Figure 4 This is a three-dimensional structural schematic diagram of a flat-bottomed plow cutter for preparing spiral microneedles according to the present invention. Figure 1 .

[0043] Figure 5 This is a three-dimensional structural schematic diagram of a flat-bottomed plow cutter for preparing spiral microneedles according to the present invention. Figure 2 .

[0044] Figure 6 This is a three-dimensional structural schematic diagram of a flat-bottomed plow cutter for preparing spiral microneedles according to the present invention. Figure 3 .

[0045] Figure 7 This is a perspective view of the cutting part of a flat-bottomed plowshare cutter for preparing spiral microneedles according to the present invention.

[0046] Figure 8 This is a perspective view of the cutting edge of a flat-bottomed plowshare cutter for preparing spiral microneedles according to the present invention.

[0047] Figure 9 This is a schematic diagram of the structure of a conventional vertical V-shaped plowing cutter.

[0048] Figure 10 This is a schematic diagram of the cutting edge of a flat-bottomed plowing tool for preparing spiral microneedles, according to the present invention, machining spiral microneedles on a workpiece.

[0049] Figure 11 A photograph of the surface of a workpiece containing a spiral microneedle array, processed using a spiral microneedle processing technology of the present invention.

[0050] Figure 12 This is a three-dimensional schematic diagram of the back cutter of a flat-bottomed ploughing tool for preparing spiral microneedles according to the present invention. Figure 1 .

[0051] Figure 13 This is a three-dimensional schematic diagram of the back cutter of a flat-bottomed ploughing tool for preparing spiral microneedles according to the present invention. Figure 2 .

[0052] Figure 14 This is a schematic diagram of a fin with a spiral microneedle array manufactured using a spiral microneedle processing technology according to the present invention.

[0053] Figure 15 A photograph of a fin with a spiral microneedle array, produced by a spiral microneedle processing technology according to the present invention.

[0054] Figure 16 This is a schematic diagram of a flat-bottomed plow-cutting tool used to prepare spiral microneedles according to the present invention for machining workpieces.

[0055] In the diagram: 100-Plowing cutter, 110-Plowing cutter blade, 111-First plowing cutter mounting through hole, 112-Second plowing cutter mounting through hole, 113-Third plowing cutter mounting through hole, 114-Cutting edge, 120-Plowing cutter mounting part, 130-Plowing cutter cutting part, 140-Cutting edge part, 150-Plowing cutter guide part, 141-Plowing cutter cutting part groove, 200-Back cutting cutter, 210-Back cutting cutter protrusion, 211-Back cutting cutter groove, 220-Back cutting cutter concave groove, 300-Tool holder, 310-Tool holder and tool rest mounting part. 311-Tool holder and tool post mounting hole; 320-Tool holder and blade mounting part; 321-Horizontal mounting part of plow cutter holder; 322-Vertical mounting part of plow cutter holder; 331-First plow cutter holder mounting through hole; 332-Second plow cutter holder mounting through hole; 333-Third plow cutter holder mounting through hole; 340-Back cutter mounting part; 341-Back cutter mounting part through hole; 400-Workpiece; 510-Workpiece fixing fixture; 520-Planer worktable; 530-Planer ram; 700-Helical micro needle array; 800-Fin. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] like Figures 1 to 3 As shown, a flat-bottomed ploughing tool for preparing spiral microneedles according to this embodiment includes a handle 300. A ploughing blade 100 is provided at the bottom of the handle 300. The handle 300 includes a handle holder mounting part 310 and a handle blade mounting part 320, wherein the handle blade mounting part 320 is located at the bottom of the handle holder mounting part 310.

[0058] like Figures 4 to 8 As shown, the plow cutter 100 includes a plow cutter mounting part 120 and a plow cutter cutting part 130. The plow cutter cutting part 130 is disposed on one side of the plow cutter mounting part 120. The plow cutter mounting part 120 is fixed to the handle and blade mounting part 320 by a threaded connection. The bottom of the plow cutter cutting part 130 is provided with a plurality of vertically parallel plow cutter blades 110. Each plow cutter blade 110 is prismatic, with a right-angled trapezoidal vertical section and an isosceles triangle horizontal cross-section of its cutting edge 140. The angle α between the cutting edge 114 and the perpendicular line passing through the cutting tip A of the cutting edge 114 is an acute angle.

[0059] like Figure 9As shown: By comparing the structure of the existing vertical V-shaped plowing tool with the structure of the plowing blade 110 of the flat-bottomed plowing tool for preparing spiral microneedles of the present invention, it can be seen that the plowing blade 110 of the present invention expands at the bottom of the existing vertical V-shaped plowing tool, that is, the lower part of the face BCFE and the face B1C1FE, to form a flat-bottomed structure with a horizontal cross-section of the cutting edge 140 parallel to the workpiece surface and an isosceles triangle. The difference between this flat-bottomed structure and the existing vertical V-shaped plowing tool is that, during the processing, the cutting edge 140 of the flat-bottomed structure with a horizontal cross-section of the isosceles triangle parallel to the workpiece surface continuously applies large strain deformation to the workpiece material with a negative rake angle cutting mechanism. At the same time, the flat-bottomed structure causes the metal material being cut and expelled to increase significantly in both volume and travel distance. The strain accumulated after a certain processing stroke can even cause tough metals such as pure copper to undergo enclosed brittle fracture. Therefore, the expelled workpiece material will periodically form microneedle prototypes on both sides of the entire plowing path.

[0060] The plow blade mounting portion 120 of the plow blade 100 is cubic in shape. A first plow blade mounting through hole 111 is provided at the top of the plow blade mounting portion 120, and a second plow blade mounting through hole 112 and a third plow blade mounting through hole 113 are provided on its sidewalls. The axis of the second plow blade mounting through hole 112 is parallel to the axis of the third plow blade mounting through hole 113, and the axis of the first plow blade mounting through hole 111 is perpendicular to the axis of the second plow blade mounting through hole 112. The vertical longitudinal section of the plow blade cutting portion 130 is a right-angled trapezoid, with parallel plow blade edges 110 located at the front end of the plow blade cutting portion 130, and the cutting edge 114 of the plow blade edges 110 located at the bottom of the plow blade edges 110. The bottom of the plowshare cutting section 130 is provided with a plowshare cutting section groove 141, and the upper part of the plowshare cutting blade 110 is disposed in the groove. A gap is left between the upper surface of the plowshare cutting blade 110 and the bottom surface of the plowshare cutting section groove 141 to facilitate chip discharge. A plowshare guide section 150 is provided between the plowshare mounting section 120 and the plowshare cutting section 130. The plowshare guide section 150 has a rectangular structure, and the plowshare 100 is positioned by one side of the plowshare guide section 150 conforming to the corresponding side wall of the vertical mounting section 322 of the plowshare handle.

[0061] The tool holder and tool post mounting part 310 is cubic in shape and has a tool holder and tool post mounting hole 311. The tool holder 300 is bolted to the planer ram 530 through this hole. The tool holder and cutting edge mounting part 320 includes a horizontal mounting part 321 and a vertical mounting part 322 for the plow cutter handle. The horizontal mounting part 321 for the plow cutter handle is located between the tool holder and tool post mounting part 310 and the vertical mounting part 322 for the plow cutter handle. It is cubic in shape and has a first plow cutter handle mounting through hole 331 at its top, corresponding to the first plow cutter mounting through hole 111. The side wall of the vertical mounting part 322 for the plow cutter handle has a second plow cutter handle mounting through hole 332 and a third plow cutter handle mounting through hole 333, respectively, corresponding to the second plow cutter mounting through hole 112 and the third plow cutter mounting through hole 113. The axis of the first plow cutter handle mounting through hole 331 is perpendicular to the axis of the second plow cutter handle mounting through hole 332.

[0062] In this embodiment, the vertex angle β of the isosceles triangle of the horizontal cross-section of the cutting edge 140 of the plowing blade 110 is 60°-70°, the angle α between the cutting edge 114 and the vertical line passing through the blade tip is 20°-25°, and the gap between adjacent plowing blades 110 is 0.8mm-1.0mm.

[0063] like Figure 16 As shown: This embodiment also provides a spiral microneedle machining process using the above-mentioned tool, including the following steps:

[0064] Step S1: Fix the workpiece 400 onto the planer table 520 using the workpiece fixing fixture 510, calibrate the parallelism between the surface of the workpiece 400 and the cutting feed direction, and ensure that the parallelism is ≤0.02mm to avoid shape deviation during the machining process.

[0065] Step S2: Clamp the handle 300 of the flat-bottomed plow cutter onto the planer slide 530, connect the plow cutter 100 to the handle 300 with bolts, calibrate the perpendicularity of the trapezoidal longitudinal section of the plow cutter blade 110 to the workpiece surface, and set the initial machining zero position.

[0066] Step S3: Preset the processing parameters, where the plowing depth is 0.15mm-0.18mm and the plowing feed speed is 8m / min-10m / min.

[0067] Step S4: Start the planer and control the plow cutter 100 to smoothly cut into the surface of the workpiece 400 with preset processing parameters, and plow along the feed path at a uniform speed. During the plowing process, the isosceles triangular cross-section of the plow cutter 110 is in continuous contact with the surface metal of the workpiece, generating directional extrusion, shearing and plastic rheological effects, causing the metal material to undergo continuous and controllable outward turning and torsional deformation in front of and to the side of the cutting edge, thereby processing a continuous, uniform, horizontally axial spiral microneedle array 700.

[0068] Step S5: After multiple plowing processes are completed, the flat-bottomed plowing tool is reset, the workpiece 400 is removed, and residual chips and oil stains on the surface are removed by ultrasonic cleaning, resulting in a metal heat dissipation substrate with a spiral microneedle array 700 integrally formed on the surface. Figure 10 , Figure 11 As shown: the axes of the spiral microneedles of the spiral microneedle array 700 on the substrate are horizontal.

[0069] Example 2

[0070] This embodiment is a further optimization based on embodiment 1, by adding a back-cutting blade 200 to achieve the overall forming of the fin 800 with the spiral microneedle array 700.

[0071] like Figure 12 , Figure 13 As shown, a back-cutting blade 200 is also provided at the bottom of the handle 300. The bottom surface of the cutting edge of the back-cutting blade 200 is coplanar with the bottom surface of the ploughing blade 110. The vertical longitudinal section of the back-cutting blade 200 is a right-angled trapezoid, and a back-cutting blade protrusion 210 is provided on the upper part of one side of the right-angled trapezoidal sidewall. The upper surface of the back-cutting blade protrusion 210 is coplanar with the upper surface of the back-cutting blade 200, and the lower surface is parallel to the lower surface of the back-cutting blade 200. A through-type back-cutting blade groove 220 is provided on the lower part of one side of the right-angled trapezoidal sidewall of the back-cutting blade 200.

[0072] The handle 300 is provided with an L-shaped back-cutting blade mounting portion 340. The back-cutting blade mounting portion 340 is provided with a back-cutting blade mounting portion through hole 341 corresponding to the back-cutting blade concave groove 220, the axis of which is parallel to the axis of the second plowing blade mounting through hole 112. The side wall of the vertical mounting portion 322 of the plowing blade handle is provided with a back-cutting blade groove 211 corresponding to the back-cutting blade protrusion 210. The back-cutting blade protrusion 210 is disposed within this groove and can move horizontally along the groove to adjust the lateral position of the back-cutting blade 200.

[0073] This embodiment also provides a processing method using the above-mentioned flat-bottomed ploughing cutter for preparing spiral microneedles, including the following steps:

[0074] Step S1: Fix the workpiece 400 onto the planer table 520 using the workpiece fixing fixture 510, and calibrate the parallelism between the surface of the workpiece 400 and the cutting feed direction to ensure that the parallelism is ≤0.02mm.

[0075] Step S2: Clamp the handle 300 of the flat-bottomed plowing cutter onto the planer slide 530, and bolt the plowing cutter 100 and the back cutter 200 onto the handle 300 in sequence. Align the trapezoidal longitudinal section of the plowing cutter blade 110 and the perpendicularity of the lower surface of the back cutter 200 to the workpiece surface, and set the initial machining zero position.

[0076] Step S3: Preset the machining process parameters, wherein the plowing depth is 0.15mm-0.18mm, the back cutting depth is 0.25mm-0.35mm, and the plowing feed speed is 8m / min-10m / min.

[0077] Step S4: Start the planer and control the flat-bottomed plowing cutter to smoothly cut into the surface of the workpiece 400 with preset parameters. First, the plowing cutter 100 moves at a constant speed along the feed path, processing a continuous, uniform, and horizontally axial spiral microneedle array 700. Subsequently, the back-cutting cutter 200 moves along the same path, peeling the spiral microneedle array 700 from the workpiece 400, obtaining a fin 800 with the spiral microneedle array 700 integrally formed on its surface. At this time, due to the peeling by the back-cutting cutter 200, the angle between the axis of each spiral microneedle of the spiral microneedle array 700 on the fin 800 and the horizontal is greater than 0°, forming spiral microneedles with a certain tilt angle, further enhancing the turbulence effect.

[0078] Step S5: After multiple plowing processes are completed, the flat-bottomed plowing cutter is reset, the fin 800 is removed, and residual chips and oil are removed by ultrasonic cleaning to obtain the finished product. Figure 14 , Figure 15 As shown.

[0079] As can be seen from the above two embodiments, the present invention achieves integrated, high-precision, and high-efficiency forming of spiral microneedles on metal surfaces through the structural design and process parameter coordination of the flat-bottomed plowing composite tool.

[0080] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flat-bottomed ploughing tool for preparing spiral microneedles, characterized in that, include: A handle (300); a plow cutter (100) is provided at the bottom of the handle (300); The handle (300) includes a handle and tool holder mounting part (310) and a handle and blade mounting part (320); the handle and blade mounting part (320) is located at the bottom of the handle and tool holder mounting part (310); The plow cutter (100) includes a plow cutter mounting part (120) and a plow cutter cutting part (130); the plow cutter cutting part (130) is disposed on one side of the plow cutter mounting part (120); the plow cutter mounting part (120) is threadedly connected to the handle and tool holder mounting part (310); The bottom of the plow cutter cutting part (130) is provided with several vertically parallel plow cutter blades (110); the plow cutter blades (110) are prism-shaped, their vertical longitudinal section is a right trapezoid, and their horizontal cross section of the cutting edge (140) is an isosceles triangle; the angle between the cutting edge (114) and the perpendicular line passing through the tip of the cutting edge (114) is an acute angle; The tool holder (300) is clamped on the planer ram (530), and the bottom surface of the plowing blade (110) is flat and parallel to the workpiece surface during processing.

2. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 1, characterized in that, The plow blade mounting part (120) of the plow blade (100) is cubic in shape; the top of the plow blade mounting part (120) is provided with a first plow blade mounting through hole (111), and its side wall is provided with a second plow blade mounting through hole (112) and a third plow blade mounting through hole (113); the axis of the second plow blade mounting through hole (112) is parallel to the axis of the third plow blade mounting through hole (113); the axis of the first plow blade mounting through hole (111) is perpendicular to the axis of the second plow blade mounting through hole (112); The handle and blade mounting part (320) includes a horizontal mounting part (321) for the plow cutter handle and a vertical mounting part (322) for the plow cutter handle; a plow cutter guide part (150) is provided between the plow cutter mounting part (120) and the plow cutter cutting part (130); the plow cutter guide part (150) has a rectangular structure, and the plow cutter (100) is positioned by one side of the plow cutter guide part (150) being attached to the corresponding side wall of the vertical mounting part (322) for the plow cutter handle; The vertical longitudinal section of the plow cutter cutting part (130) is a right trapezoid; the parallel plow cutter blades (110) are set at the front end of the plow cutter cutting part (130); the cutting edge (114) of the plow cutter blades (110) is set at the bottom of the plow cutter blades (110); The bottom of the plow cutter cutting part (130) is provided with a plow cutter cutting part groove (141); the upper part of the plow cutter blade (110) is provided in the plow cutter cutting part groove (141); there is a gap between the upper surface of the plow cutter blade (110) and the bottom surface of the plow cutter cutting part groove (141).

3. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 2, characterized in that, The tool holder mounting part (310) is cubic in shape; the tool holder mounting part (310) is provided with a tool holder mounting hole (311); the tool holder (300) is bolted to the planer ram (530) through the tool holder mounting hole (311); the tool holder blade mounting part (320) includes a horizontal mounting part (321) for the plow cutter handle and a vertical mounting part (322) for the plow cutter handle; the horizontal mounting part (321) for the plow cutter handle is located between the tool holder mounting part (310) and the vertical mounting part (322) for the plow cutter handle; the horizontal mounting part (321) for the plow cutter handle is cubic in shape, and its top is provided with There is a first plow cutter handle mounting through hole (331) corresponding to the first plow cutter mounting through hole (111); the side wall of the vertical mounting part (322) of the plow cutter handle is provided with a second plow cutter handle mounting through hole (332) and a third plow cutter handle mounting through hole (333) corresponding to the second plow cutter mounting through hole (112) and the third plow cutter mounting through hole (113) respectively; the axis of the second plow cutter mounting through hole (112) is parallel to the axis of the third plow cutter mounting through hole (113); the axis of the first plow cutter handle mounting through hole (331) is perpendicular to the axis of the second plow cutter handle mounting through hole (332).

4. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 3, characterized in that, The apex angle of the isosceles triangle of the horizontal cross-section of the cutting edge (140) of the plowing blade (110) is 60°-70°; the angle between the cutting edge (114) of the cutting edge (140) and the vertical line passing through the blade tip is 20°-25°.

5. A flat-bottomed ploughing tool for preparing spiral microneedles according to claim 4, characterized in that, The gap between adjacent plowing blades (110) is 0.8mm-1.0mm.

6. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 2 or 5, characterized in that, The bottom of the handle (300) is also provided with a back-cutting blade (200); the bottom surface of the cutting edge of the back-cutting blade (200) is coplanar with the bottom surface of the plowing blade (110).

7. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 6, characterized in that, The vertical longitudinal section of the back-cutting blade (200) is a right-angled trapezoid; a back-cutting blade protrusion (210) is provided on the upper part of the right-angled trapezoidal sidewall of one side of the back-cutting blade (200); the upper surface of the back-cutting blade protrusion (210) is coplanar with the upper surface of the back-cutting blade (200); the lower surface of the back-cutting blade protrusion (210) is parallel to the lower surface of the back-cutting blade (200); a through back-cutting blade concave groove (220) is provided on the lower part of the right-angled trapezoidal sidewall of one side of the back-cutting blade (200).

8. A flat-bottomed ploughing cutter for preparing spiral microneedles according to claim 7, characterized in that, The handle (300) is provided with a back-cutting blade mounting part (340) with an L-shaped cross-section; the back-cutting blade mounting part (340) is provided with a back-cutting blade mounting part through hole (341) corresponding to the back-cutting blade concave groove (220); the axis of the back-cutting blade mounting part through hole (341) is parallel to the axis of the second plow blade mounting through hole (112); the side wall of the plow blade handle vertical mounting part (322) is provided with a back-cutting blade groove (211) corresponding to the back-cutting blade protrusion (210); the back-cutting blade protrusion (210) is located in the back-cutting blade groove (211); the upper and lower surfaces of the back-cutting blade protrusion (210) can move horizontally along the back-cutting blade groove (211).

9. A processing technology for spiral microneedles, characterized in that, The method of using a flat-bottomed ploughing cutter for preparing spiral microneedles as described in claim 5 includes the following steps: Step S1: Fix the workpiece (400) on the planer table (520) using the workpiece fixing fixture (510), and calibrate the parallelism between the surface of the workpiece (400) and the cutting feed direction to ensure that the parallelism is ≤0.02mm; Step S2: Clamp the handle (300) of the flat-bottomed plow cutter onto the planer ram (530), bolt the plow cutter (100) onto the handle (300), calibrate the perpendicularity of the trapezoidal longitudinal section of the plow cutter blade (110) to the workpiece surface, and set the initial machining zero position. Step S3: Preset the processing parameters, including: plowing depth of 0.15mm-0.18mm and plowing feed speed of 8m / min-10m / min; Step S4: Start the planer and control the plow cutter (100) to smoothly cut into the surface of the workpiece (400) with preset processing parameters, and plow along the feed path at a uniform speed to process a continuous and uniform spiral micro needle array (700). Step S5: After the multi-pass plowing process is completed, the flat-bottomed plowing tool is reset, the workpiece (400) is removed and ultrasonically cleaned to remove residual chips and oil stains on the surface, and a metal heat dissipation substrate with a spiral micro-needle array (700) integrally formed on the surface is obtained. The axis of each spiral micro-needle of the spiral micro-needle array (700) on the metal heat dissipation substrate is horizontal.

10. A processing technology for spiral microneedles, characterized in that, The method of using a flat-bottomed ploughing cutter for preparing spiral microneedles as described in claim 8 includes the following steps: Step S1: Fix the workpiece (400) on the planer table (520) using the workpiece fixing fixture (510), and calibrate the parallelism between the surface of the workpiece (400) and the cutting feed direction to ensure that the parallelism is ≤0.02mm; Step S2: Clamp the handle (300) of the flat-bottomed plowing cutter onto the planer ram (530), and bolt the plowing cutter (100) and the back cutter (200) onto the handle (300) in sequence. Align the trapezoidal longitudinal section of the plowing cutter blade (110) and the perpendicularity of the lower surface of the back cutter (200) to the workpiece surface, and set the initial machining zero position. Step S3: Preset the machining process parameters, including: plowing depth of 0.15mm-0.18mm, back cutting depth of 0.25mm-0.35mm, and plowing feed speed of 8m / min-10m / min; Step S4: Start the planer and control the flat-bottomed plow cutter to smoothly cut into the surface of the workpiece (400) with preset parameters. The plow cutter (100) moves along the feed path at a uniform speed to first process a continuous, uniform, and horizontal spiral micro-needle array (700). Next, the back cutter (200) peels the spiral microneedle array (700) from the workpiece (400) to obtain a fin (800) with the spiral microneedle array (700) integrally formed on the surface; at this time, the axis of each spiral microneedle of the spiral microneedle array (700) on the fin (800) has an angle greater than 0° with the horizontal. Step S5: After the multi-pass plowing process is completed, the flat-bottomed plowing cutter is reset, the fins (800) are removed, and ultrasonic cleaning is performed to remove residual chips and oil stains from the surface.

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