Resin-based carbon fiber surface hydrophobic structure processing method based on micro milling of forming cutter

Abstract

The invention discloses a method for processing a hydrophobic structure on the surface of a resin-based carbon fiber based on micro milling of a forming cutter, which is characterized in that a micro milling machine tool is used as processing equipment, a micro milling cutter is used as a processing cutter, and an array groove structure is prepared on the surface of the resin-based carbon fiber by controlling the milling depth and the milling distance. According to the method, a micro-milling machine tool serves as machining equipment, a forming micro-milling cutter with the tool nose angle of 45 degrees is selected as a machining tool, the array groove structure is prepared by controlling the milling depth and the milling distance, and therefore machining of the hydrophobic structure on the surface of the resin-based carbon fiber is achieved. The hydrophobic structure prepared by the method has the advantages of simple process, stable structure, good consistency and long-term service.

Description

Technical Field

[0001] The present invention belongs to the technical field of micro - milling processing, and relates to a method for processing a hydrophobic structure on the surface of resin - based carbon fiber, specifically to a method for processing a hydrophobic structure on the surface of resin - based carbon fiber based on micro - milling with a formed tool. Background Technique

[0002] The preparation of a hydrophobic structure on the surface of resin - based carbon fiber is crucial for improving its performance. Hydrophobization treatment of the resin - based carbon fiber surface can significantly reduce the surface energy of the fiber, enhance the compatibility with the resin and the interfacial bonding strength. Moreover, the hydrophobic structure can effectively block the direct contact between water molecules and the fiber, inhibit the electrochemical corrosion of carbon fiber in acid - base or salt - spray environments, and extend its service life. In addition, the hydrophobic surface can also reduce ice crystal attachment, lower fluid resistance, and promote the application of resin - based carbon fiber in fields such as aerospace anti - icing coatings and ship drag reduction.

[0003] Currently, the preparation methods of hydrophobic structures mainly include physical modification, chemical coating, and composite synergy, etc. The physical modification method constructs micro - nano structures on the sample surface through mechanical or energy means, such as plasma etching, laser irradiation, or ion beam bombardment, which can form micron / nano - scale grooves or holes on the fiber surface to increase surface roughness and enhance hydrophobicity; the chemical coating method realizes hydrophobic functionalization by introducing low - surface - energy substances. Common techniques include depositing silica or fluorosilane coatings on the fiber surface by sol - gel method, generating polytetrafluoroethylene (PTFE) films by chemical vapor deposition (CVD), and self - assembled monolayer (SAMs) modification with silane coupling agents. The composite synergy method combines physical and chemical means. For example, a rough substrate is first constructed by plasma etching, and then a fluoropolymer or graphene nanosheet is coated by impregnation method to form a double hydrophobic effect of multi - level micro - nano structures and low - surface - energy coatings. However, the current methods have limitations such as complex process flows, high costs, and short service performance, and it is necessary to develop a method for preparing a hydrophobic structure on the surface of resin - based carbon fiber with low cost, simple process, and long - term effectiveness. Summary of the Invention

[0004] The present invention provides a method for processing a hydrophobic structure on the surface of resin - based carbon fiber based on micro - milling with a formed tool, which can simply and efficiently prepare a hydrophobic structure with stable structure and good consistency on the surface of resin - based carbon fiber.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] A method for processing a hydrophobic structure on the surface of resin - based carbon fiber based on micro - milling with a formed tool, comprising the following steps:

[0007] Using a micro - milling machine as the processing equipment and a micro - milling cutter as the processing tool, by controlling the milling depth and milling spacing, an array of groove structures is prepared on the surface of resin - based carbon fiber, where:

[0008] The tip angle of the micro - milling cutter is 45°;

[0009] The milling depth is 30 - 60μm, preferably 40μm, and the milling period is 100 - 140μm, preferably 120μm.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. The present invention uses a micro - milling machine as the processing equipment and selects a formed micro - milling cutter with a tip angle of 45° as the processing tool. By controlling the milling depth and milling spacing, an array of groove structures is prepared, thereby realizing the processing of a hydrophobic structure on the surface of resin - based carbon fiber.

[0012] 2. The hydrophobic structure prepared by the present invention has the advantages of simple process, stable structure, good consistency and long - term service. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an overall model diagram of a three - axis micro - milling machine;

[0014] Figure 2 It is a schematic diagram of a formed milling cutter;

[0015] Figure 3 It is a schematic diagram of the micro - milling of a V - groove array by a formed milling cutter;

[0016] Figure 4 It is a schematic diagram of the movement trajectory of the milling cutter for the micro - milling of a V - groove array by a formed milling cutter;

[0017] Figure 5 It is the detection result of the processing of a V - groove array by a formed micro - milling cutter;

[0018] Figure 6 It is the detection result of the wettability of the carbon fiber surface with a V - groove array structure, (a) the carbon fiber surface without structure, (b) the V - groove array structure, the processing depth of the V - groove is 40μm and the spacing is 120μm. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following further describes the technical solutions of the present invention in conjunction with the drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention shall be covered by the protection scope of the present invention.

[0020] The present invention provides a method for processing a hydrophobic structure on the surface of resin - based carbon fiber based on micro - milling with a formed tool, and the method includes the following steps:

[0021] Step (1) Setup of the micro-milling machine. Figure 1 The overall model diagram of the three-axis micro-milling machine for machining V-shaped grooves is shown. This micro-milling machine mainly includes three moving stages, namely X, Y, and Z, and different trajectory machining of the milling cutter can be achieved through programming control.

[0022] Step (2) Selection of the micro-milling tool. In order to obtain an array of V-shaped grooves, the milling cutter is selected as a formed micro-milling cutter. The schematic diagram of this milling cutter is as Figure 2 shown. The tip angle (θ) of this milling cutter is 45°, the edge length (l) is 4 mm, the edge diameter (D 2 ) is 2.1 mm, the overall length (L) is 50 mm, the front core thickness (D 2 ) is 0.05 mm, and the material is cemented carbide.

[0023] Step (3) Machining of an array of V-shaped grooves on the surface of resin-based carbon fiber. Figure 3 The schematic diagram of the formed milling cutter for micro-milling an array of V-shaped grooves is shown. The period (d) and depth (h) of machining the array of V-shaped grooves are set to 120 μm and 40 μm respectively, the spindle speed is selected as 10,000 r / min, and the machining range is set to 5 mm × 5 mm. Figure 4 The schematic diagram of the milling cutter movement trajectory for micro-milling an array of V-shaped grooves by the formed milling cutter is shown. Trajectory ①: The milling cutter makes a cutting movement along the length direction of the resin-based carbon fiber surface from the starting origin, and V-shaped grooves are machined on the resin-based carbon fiber surface; Trajectory ②: Lift the tool. When the milling cutter reaches the set machining distance, lift the tool to make the tool leave the sample surface by 0.5 mm; Trajectory ③: Translate horizontally. The milling cutter moves above the next groove machining position in the direction perpendicular to Trajectory ①; Trajectory ④: Return. The milling cutter returns to the starting origin position of the next groove machining along the length direction of the resin-based carbon fiber surface; Trajectory ⑤: Lower the tool. The milling cutter moves vertically downward to the sample surface to start a new round of V-shaped groove machining. The subsequent cycles repeat Trajectory ①→②→③→④→⑤, thus realizing the machining of an array of V-shaped grooves. Figure 5 The partial morphology diagram of the array of V-shaped grooves obtained by machining with the formed micro-milling cutter is shown.

[0024] Step (4) Detection of the wettability of the carbon fiber surface with the V-shaped groove array structure. The liquid selected in the contact angle measurement is pure water, and the droplet volume is selected as 1 μl. As Figure 6 shown in a), the contact angle of the surface of the carbon fiber sample without structure is 30.7°, and the surface shows strong hydrophilic characteristics. However, the contact angle of the surface with the V-shaped groove array structure with a machining depth of 40 μm and a period of 120 μm is 126.3°, as Figure 6As shown in b), the contact angle increases by 95.6° compared with the original surface of carbon fiber. The above results indicate that the V-groove array structure machined on the surface of resin-based carbon fiber has good hydrophobic performance, providing a new technical method for the processing of hydrophobic microstructures on the surface of resin-based carbon fiber.

Claims

1. A method for processing a hydrophobic structure on the surface of a resin-based carbon fiber based on micro-milling of a forming tool, characterized in that The method uses a micro-milling machine as processing equipment and a micro-milling cutter as a processing tool, and prepares an array groove structure on the surface of a resin-based carbon fiber by controlling the milling depth and the milling spacing.

2. The method for processing the hydrophobic structure of the resin-based carbon fiber surface based on micro-milling of a forming tool according to claim 1, characterized in that The tip angle of the micro-milling cutter is 45°.

3. The method for processing the hydrophobic structure of the resin-based carbon fiber surface based on micro-milling of a forming tool according to claim 1 or 2, characterized in that The material of the micro-milling cutter is hard alloy.

4. The method for processing the hydrophobic structure of the resin-based carbon fiber surface based on micro-milling of a forming tool according to claim 1 or 2, characterized in that The micro-milling cutter has a blade length of 4 mm, a blade diameter of 2.1 mm, a total length of 50 mm, and a front end core thickness of 0.05 mm.

5. The method for processing the hydrophobic structure of the resin-based carbon fiber surface based on micro-milling of a forming tool according to claim 1, characterized in that The milling depth is 30-60 μm, and the milling period is 100-140 μm.

6. The method for processing the hydrophobic structure of the resin-based carbon fiber surface based on micro-milling of a forming tool according to claim 5, characterized in that The milling depth is 40 μm, and the milling period is 120 μm.

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