Processing technology of polyimide combined coil framework

Abstract

The invention provides a processing technology of a polyimide combined coil framework. The polyimide combined coil framework is formed by assembling a side plate and a sleeve and then flanging the sleeve. Counter bores are designed in the side plates, thin film counter bores are achieved through laser, interference between the bending radius R of the sleeve and the side plates is avoided, complete attachment of the side plates and the sleeve is achieved, and the internal winding space of the coil framework is improved; the combination strength of the side plate and the sleeve is improved, and the inner diameter of the sleeve is not extruded while the side plate and the sleeve are stably combined.

Description

Technical Field

[0001] This invention relates to a processing technology for a polyimide composite coil bobbin, belonging to the field of non-metallic processing technology. Background Technology

[0002] Polyimide coil bobbins are widely used in various types of motors, serving to support, position, and protect the coils, ensuring normal motor operation, reducing equipment failure rates, and extending motor lifespan.

[0003] Coil frame components are continuously evolving towards larger internal spaces and smaller external dimensions. For coil frames with a wall thickness less than 0.2mm that cannot be injection molded or machined, the conventional method is to assemble a coil frame using side plates punched from polyimide film and a sleeve wound from polyimide film. However, interference exists at the bends of the coil frame side plates and the sleeve, creating gaps (0.1mm–0.15mm) that prevent them from fitting flat. Figure 1 As shown, during the production and use of the coil frame, the side plate may slide or squeeze the inner hole of the coil, causing the part to be scrapped and unable to meet the requirements of aerospace components. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a processing technology for a polyimide composite coil bobbin. This processing technology expands the internal winding space of the coil bobbin and improves the structural stability.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a processing technology for a polyimide composite coil bobbin, comprising the following steps: ① Side panel processing: The side panel is formed by laser processing of polyimide film, and has internal holes and countersunk holes. ② Processing the sleeve: The seamless polyimide tube is cut and formed using a mold; ③ Assemble the coil frame: Assemble the side plate and the sleeve, and fold the sleeve. In step ①: Inner diameter: Side plate inner diameter D2 = Sleeve outer diameter D3 - (0.005mm~0.01mm); Countersunk hole: Located at the edge of the inner hole, the inner diameter of the countersunk hole D1 = (0.5~0.6) × sleeve flange amount C, and the depth of the countersunk hole A = sleeve bending radius R + 0.02 mm; Shape: Based on the already processed inner diameter D2 of the side plate, it is formed by laser cutting; In step ②: The sleeve length G = internal space of the coil bobbin F + 2 × side plate thickness B + (outer diameter of sleeve D3 - inner diameter of sleeve D4) + 0.6mm; In step ③: After the countersunk hole of the side plate faces outward and is assembled with the sleeve in an interference fit, the end of the sleeve is flanged and formed, with a flanging amount C = 0.2 mm ~ 0.3 mm.

[0007] The side plate is integrally formed by laser cutting of the inner hole, countersinking hole and external shape.

[0008] The flanging process employs a high-temperature hot-pressing technique.

[0009] The beneficial effects of this invention are as follows: the side plate is designed with countersunk holes, and the thin film countersunk holes are achieved by laser, avoiding the interference between the bending radius R of the sleeve and the side plate, achieving complete fit between the side plate and the sleeve, and increasing the winding space inside the coil skeleton; it also improves the bonding strength between the side plate and the sleeve, and the side plate and the sleeve are firmly bonded without compressing the inner diameter of the sleeve. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a traditional coil frame in the prior art; Figure 2 This is a process flow diagram of the present invention; Figure 3 This is a schematic diagram of the coil frame structure of the present invention; Figure 4 This is a schematic diagram of the side plate processing of the present invention; Figure 5 This is a schematic diagram of the sleeve processing of the present invention; Figure 6 This is a schematic diagram of the assembly of the coil frame of the present invention; Figure 7 This is a schematic diagram of the flange of the present invention; In the diagram: 1-side plate, 2-sleeve. Detailed Implementation

[0011] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0012] like Figures 2-7 As shown, the processing technology of the present invention is as follows: (1) Side plate 1: The side plate is made of polyimide film by laser processing. The side plate is designed with inner hole, countersunk hole and outer shape. The specific implementation plan is as follows: (1.1) Laser cutting of inner hole: Select 500mm×500mm polyimide film (thickness B according to the design drawings, 0.1mm~0.3mm in this embodiment) and laser process the inner diameter D2 of the side plate, where the inner diameter D2 of the side plate = the outer diameter of the sleeve D3 - (0.005mm~0.01mm), so as to facilitate the formation of a suitable interference fit between the side plate 1 and the sleeve 2.

[0013] (1.2) Laser countersinking: Based on the inner diameter D2 of the already processed side plate, the inner diameter D1 and the depth A of the countersink are processed by laser. The inner diameter D1 of the countersink is (0.5~0.6) × sleeve flange amount C, and the depth A of the countersink is the bending radius R + 0.02mm. The countersink design prevents interference between the side plate and the bending radius R of the sleeve.

[0014] (1.3) Laser cutting of the outer shape: The outer shape of the side plate is processed by laser, based on the inner diameter D2 of the already processed side plate.

[0015] (2) Sleeve 2: It is made by cutting profile. The profile polyimide seamless tube is processed by cutting mold to make sleeve length G, where sleeve length G = internal space of coil skeleton F + 2 × side plate thickness B + (outer diameter of sleeve D3 - inner diameter of sleeve D4) + 0.6mm.

[0016] (3) Coil frame: The side plate 1 and the sleeve 2 are assembled into the coil frame using a clamp. The countersunk hole of the side plate 1 is placed on the outside of the coil frame, such as... Figure 6 As shown, after assembly, the sleeve is subjected to high-temperature flanging treatment, with a flanging amount C=0.2mm~0.3mm.

[0017] Specifically, during the assembly process, the countersunk hole is placed on the outside of the coil frame to avoid interference of the bushing bending radius R on the side plate.

[0018] Specifically, a soldering iron is used to fold and shape the sleeve after assembling the side panel.

Claims

1. A processing technology for a polyimide composite coil bobbin, characterized in that: Includes the following steps: ① Processing side plate (1): The side plate (1) is formed by laser processing of polyimide film, and has inner holes and countersunk holes. ② Processing sleeve (2): Polyimide seamless tube is cut and formed by mold; ③ Assemble the coil frame: Assemble the side plate (1) and the sleeve (2), and fold the sleeve (2) over; In step ①: Inner diameter: Side plate inner diameter D2 = Sleeve outer diameter D3 - (0.005mm~0.01mm); Countersunk hole: Located at the edge of the inner hole, the inner diameter of the countersunk hole D1 = (0.5~0.6) × the sleeve flange amount C, and the depth of the countersunk hole A = the sleeve bending radius R + 0.02 mm; Shape: Based on the already processed inner diameter D2 of the side plate, it is formed by laser cutting; In step ②: The sleeve length G = internal space of the coil bobbin F + 2 × side plate thickness B + (outer diameter of sleeve D3 - inner diameter of sleeve D4) + 0.6mm; In step ③: After the countersunk hole of the side plate (1) is assembled with the sleeve (2) with an interference fit facing outward, the end of the sleeve (2) is flanged and formed, with a flanging amount C = 0.2 mm ~ 0.3 mm.

2. The processing technology of the polyimide composite coil bobbin as described in claim 1, characterized in that: The side plate (1) is integrally formed by laser cutting of the inner hole, countersinking hole and outer shape.

3. The processing technology of the polyimide composite coil bobbin as described in claim 1, characterized in that: The flanging process employs a high-temperature hot-pressing technique.

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