Anodized Aluminum CNC Precision Electronic Parts for phone midframe

　　Excellent aesthetics and performance! Anodized aluminum CNC precision mobile phone mid-frame components meet the high-quality demands of the entire device.

　　Flagship phone mid-frames experience noticeable wobbling when pressed due to CNC machining hole tolerances exceeding ±0.015mm, resulting in a 0.03mm gap between the screen and back cover. Cost-effective models have mid-frames with an anodized layer only 8μm thick, showing scratches and discoloration after just one month of daily use, resulting in a user complaint rate exceeding 15%. Folding screen phones experience uneven anodizing at the folding area, causing cracking after repeated bending, impacting structural strength and signal transmission. As the "framework" of the entire device, the mid-frame of a mobile phone must support the precise assembly of core components such as the screen, motherboard, and battery, while also balancing lightweight (controlling overall weight), aesthetic quality (affecting the user experience), and durability (resisting daily wear and tear). Traditional aluminum mid-frames that neglect the coordinated optimization of "CNC precision" and "anodized performance" can at best compromise the overall quality of the device and at worst lead to assembly failures and after-sales service issues. Traditional mobile phone mid-frame components face significant challenges: insufficient CNC machining precision (frame curvature tolerance ±0.02mm, button hole position deviation ±0.02mm), leading to screen light leakage and loose buttons after assembly; crude anodizing processes (film thickness fluctuations of 5-12μm, color difference ΔE ≥ 2.5), resulting in poor appearance consistency; inappropriate aluminum material selection (e.g., insufficient strength of pure aluminum), leading to deformation when dropped; lack of signal compatibility treatment, resulting in the anodized layer blocking antenna signals, impacting calls and 5G networks; and low mass production yields (≤95%), making it difficult to meet the "million-level" mobile phone shipment demand. Anodized aluminum CNC precision mobile phone mid-frame components precisely address these challenges – micron-level CNC machining ensures zero-gap assembly, high-performance anodizing enhances appearance and durability, and signal compatibility design optimizes the communication experience, ensuring a stable, attractive, durable, and reliable mobile phone mid-frame.

　　Why does it meet the core requirements of mobile phone mid-frames? Five Core Advantages

　　1. Micron-level CNC Precision Machining: Ensures zero-gap assembly and structural stability for the entire device.

　　Ultra-precision machining is achieved to meet the precision requirements of the mobile phone midframe's multi-component fit and narrow bezel design.

　　Strict control of key dimensional tolerances: Utilizing a Japanese FANUC α-D21LiB five-axis CNC machine (positioning accuracy ±0.003mm, repeatability ±0.001mm), the machine achieves core midframe dimensions with a bezel width tolerance of ±0.008mm (to accommodate narrow-bezel screens), screen/back cover mating surface flatness ≤0.005mm/m, and button/charging port hole position tolerance of ±0.006mm. This ensures a post-assembly gap of ≤0.01mm, ensuring no wobble when pressed and no light leakage from the screen, thus resolving the "loose assembly" issue of traditional midframes.

　　Complex structure one-piece molding: Five-axis simultaneous machining enables the midframe's "bezel + internal reinforcement ribs + interface grooves" to be perfectly formed. One-piece molding, such as the flagship phone's midframe lens module positioning platform (coaxiality ≤ 0.008mm) and the folding screen midframe hinge mounting point (tolerance ±0.005mm), eliminates the need for splicing (traditional splicing is prone to stress concentration and breakage when dropped). This increases structural strength by 30%, and the device's drop resistance (1.5-meter drop to concrete) pass rate has increased from 85% to 99%.

　　Lightweight Optimization: Selected 6061-T6 (tensile strength ≥ 310MPa) or 7000 series aluminum alloy (such as 7075-T6, hardness ≥ 150HB) are used. CNC machining utilizes a "hollow reinforcement rib" design (rib thickness 0.8-1.2mm, tolerance ±0.01mm). This reduces the midframe weight by 20% compared to traditional solid designs (for example, the midframe weight of a 5.5-inch phone is controlled at 18-22g). This balance of lightweight and deformation resistance keeps the device weight under 200g. Within.

　　2. High-Performance Anodizing: Both Attractive and Durable

　　Targeting the "high-quality appearance and daily durability" requirements of mobile phone mid-frames, a customized anodizing process is provided:

　　Enhanced film performance: Utilizing a "hard anodizing" process, the film thickness is precisely controlled at 12-18μm (traditional mid-frames are only 8-10μm), with a hardness ≥ HV 300 (resistant to daily scratches from keys, coins, etc.). It withstands 300 reciprocating rubbings with 600g steel wool (#0000) without scratching, and a 200-hour salt spray test without corrosion (traditional mid-frames develop spots after 100 hours). It also maintains color fading after six months of daily use, and the after-sales scratch complaint rate has been reduced from 15% to 1.2%.

　　Optimized appearance consistency: Utilizing a "constant temperature and pressure oxidation + precise colorant ratio" process, the color deviation is ΔE ≤ 1.2 (far superior to the industry standard of ΔE ≤ 2.0). Standards are available), supporting customizable finishes such as matte, glossy, and matte, as well as mainstream colors like Space Gray, Aurora Blue, and Frosted Silver. The appearance qualification rate during mass production is ≥99%, resolving the issue of noticeable color variation within the same batch of traditional mid-frames.

　　Detailed quality enhancements: The mid-frame corners utilize CNC precision chamfering (R0.2-R0.3mm, tolerance ±0.005mm), combined with the delicate tactile feel of anodizing, ensuring a smooth grip. Highly susceptible areas, such as the lens module and the edge of the charging port, are treated with an additional "thickened oxide layer" (20μm thick) to enhance durability and prevent paint peeling from the edges after long-term use. 3. Signal Compatibility Design: Preventing Communication Blockage by the Anodized Layer

　　To address the need for the midframe to carry antenna signal transmission, we optimized the anodizing and structural design:

　　Localized Oxide-Free Treatment: For the midframe antenna areas (such as the top/bottom 5G millimeter-wave antennas and the side sub-6GHz antennas), a "masking + laser engraving" process is used to remove the anodized layer in these areas (exposing the conductive aluminum substrate). This ensures signal penetration of ≥95%, avoiding the signal attenuation caused by traditional "full oxidation" midframes (e.g., increasing 5G download speeds from 1.2Gbps to 1.5Gbps).

　　Conductive Oxide Adaptation: For midframe areas requiring grounding or signal transmission (such as motherboard mounting posts and metal button contacts), a "conductive anodizing" process is used. The surface resistance is ≤10Ω/□, ensuring a grounding resistance of ≤0.1Ω. This prevents electrostatic interference from affecting motherboard performance, improves the call signal-to-noise ratio to 45dB (compared to 38dB for traditional midframes), and reduces call noise.

　　Structural Avoidance Optimization: CNC During processing, a "signal clearance slot" (width 1.0mm±0.01mm, depth 0.5mm±0.005mm) is reserved in the antenna area of the midframe to prevent signal shielding by the metal structure, ensuring stable communication in weak signal environments such as basements and elevators. 4. Enhanced Drop and Fatigue Resistance: Adapted to Daily Phone Usage

　　Targeting accidental drops and prolonged handling, the midframe structure and material properties have been enhanced:

　　Drop Deformation Resistance: Key midframe components (such as the screen corner supports and the lens protector) utilize a "thickened aluminum wall + reinforced rib design" (wall thickness 1.5mm ± 0.01mm). After a 1.5-meter drop test (onto concrete), midframe deformation was ≤0.1mm, reducing the screen breakage rate from 20% to 5%, far exceeding the industry standard for a 1.2-meter drop.

　　Folding Screen Fatigue Resistance: The hinge mounting area of the midframe is constructed of 7075-T6 high-strength aluminum alloy. Stress relief treatment is applied during anodizing, resulting in a film elongation at break of ≥5%. After 200,000 folds (at a 120° angle), the midframe showed no cracks or oxide layer loss, and structural strength degradation was ≤5%, meeting the requirements for long-term folding screen use. Demand;

　　Anti-fingerprint optimization: After anodizing, the device is treated with a "nano-level anti-fingerprint coating" (contact angle ≥ 110°). This prevents fingerprints from remaining during daily use and is easy to clean. This solves the pain point of traditional mid-frames being easily stained with fingerprints and appearing dirty, and improves user satisfaction by 40%.

　　5. Mass Production Guarantee: Keeping pace with the "million-level" smartphone shipment pace

　　A mass production system combining automated CNC machining, standardized anodizing, and full-process inspection is established to ensure efficiency and quality:

　　Automated Production Line: The CNC process utilizes robotic loading and unloading (capacity of 300 pieces per hour), coupled with a "single-clamping, multi-surface machining" process to reduce clamping errors. The anodizing process utilizes a fully automated production line (constant temperature of 20±1°C, constant voltage of 18±0.5V), with real-time monitoring of film thickness and color. Overall production capacity is five times higher than traditional processes, enabling the delivery of 20,000 qualified midframes per day.

　　Full-Dimensional Quality Inspection:

　　Precision Inspection: A three-dimensional coordinate measuring machine (accuracy of ±0.001mm) spot-checks key midframe dimensions, and the first piece of each batch undergoes full-dimensional inspection. During mass production, a visual inspection system (accuracy of ±0.002mm) screens for hole position and curvature deviations.

　　Appearance Inspection: An automated colorimeter (ΔE accuracy of ±0.001mm) is used to inspect key midframe dimensions. ±0.05) for color consistency, and a light inspection bench (5000K standard light source) for scratches and bubbles. The appearance qualification rate is ≥99.5%.

　　Performance testing: 50 units are sampled from each batch for drop testing, scratch testing, and signal transmission testing to ensure performance meets standards.

　　Flexible delivery: Custom mid-frames are supported for different phone categories (narrow bezels for flagship phones, custom-shaped mid-frames for foldable screens, and minimalist designs for cost-effective models). Mold development takes 7-10 days, small-batch trial runs (100-500 units) are delivered within 3 days, and large-volume orders (over 100,000 units) are delivered within 15 days, meeting the demands of mobile phone manufacturers for rapid iteration and on-time delivery. Real-world testing reveals the quality of the midframe.

　　Flagship midframe: 6061-T6 aluminum, CNC-machined to a ±0.008mm tolerance for bezel width, 0.009mm clearance between the display and the screen, and smooth movement. 15μm hard anodized finish with anti-fingerprint coating, no scratches after 300 rubbings with 600g steel wool, and a color difference of ΔE=0.8. The overall quality rivals high-end models, with a 98% positive user rating.

　　Folding screen midframe: 7075-T6 aluminum, hinge mounting tolerance ±0.005mm, and no cracking in the oxide layer after 200,000 folds. Partially oxidized antenna areas achieve 5G download speeds of 1.45Gbps, only 0.05Gbps lower than without a midframe, with no signal loss.

　　Cost-effective midframe: 5052 aluminum alloy lightweight design (midframe weight 18g), 12μm The anodized layer showed no scratches or discoloration after three months of daily use. After a drop test (1.2 meters), the middle frame deformed by 0.08mm and the screen remained intact. The after-sales service rate dropped from 15% to 1.5%, balancing cost and performance.

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