Sandblasted Aluminum CNC Precision Electronic Parts for 5G communication

　　5G High-Frequency Adaptation! Sandblasted Aluminum CNC Precision Electronic Components Build a Strong Defense for Communication Signal Transmission.

　　Is the reflection loss of high-frequency signals (26GHz millimeter wave) exceeding 3dB due to uneven sandblasting (Ra fluctuation ±1.2μm) in 5G base station antenna elements, reducing coverage by 20%? Is the dimensional deviation of the RRU (Remote Radio Unit) housing after sandblasting ±0.03mm excessive, resulting in excessive clearance between the assembly and internal modules, causing water ingress during rainy days and equipment downtime? Is the 5G connector housing not pre-treated for sandblasting, resulting in poor coating adhesion and peeling after just six months of outdoor deployment, causing signal contact resistance to soar to 50mΩ? 5G communications require far more than 4G electronic components in terms of surface consistency, dimensional accuracy, and weather resistance. Ignoring the adaptability of the sandblasting process and the synergy between precision machining and traditional aluminum CNC parts can lead to signal attenuation and equipment failure at best, and even impact the coverage quality and stability of the 5G network at worst. Traditional 5G electronic component processing suffers from significant pain points: The sandblasting process is crude (manually controlling particle size and pressure), resulting in surface roughness Ra fluctuations exceeding ±0.8μm, failing to meet the surface flatness requirements of 5G high-frequency signals. There's a disconnect between CNC machining and sandblasting, resulting in deviations exceeding ±0.02mm in key dimensions (such as connector pitch and antenna element curvature) after sandblasting. Aluminum parts lack specialized anti-corrosion treatment after sandblasting, resulting in outdoor salt spray resistance of less than 200 hours. Sandblasting consistency during mass production is poor (qualification rate ≤ 85%), making it difficult to meet the "10,000-level" deployment requirements of 5G base stations. Sandblasted aluminum CNC precision electronic components (specifically for 5G communications) precisely address these challenges. Customized sandblasting optimizes surface properties, micron-level CNC machining ensures dimensional accuracy, and industrial-grade post-processing enhances weather resistance, ensuring stable signal transmission, robust environmental resistance, and high-quality mass production.

　　Why are they so well-suited to the core requirements of 5G communications? Four Core Advantages

　　1. Customized Sandblasting Process: Optimizing 5G High-Frequency Signal Transmission and Surface Functionality

　　Customized sandblasting solutions are tailored to the functional needs of components in different 5G scenarios, balancing surface roughness and signal performance.

　　Precise Sandblasting Particle Size Control: 80#-320# white corundum/silicon carbide abrasives are selected based on the component's intended use. For base station antenna elements, signal reflection must be minimized, so 240#-320# fine sandblasting (Ra 0.8-1.6μm) is used to reduce millimeter-wave signal scattering loss (reflection loss ≤ 1.5dB). For RRU casings, slip and scratch resistance is achieved, so 80#-120# coarse sandblasting (Ra 2.4-3.2μm) is used. The surface friction coefficient is increased to 0.6, preventing slippage during installation.

　　Automated Sandblasting Pressure and Path: A robotic automated sandblasting system (adjustable pressure 0.3-0.8MPa) is used to 3D-blast components. Model-based sandblasting paths (such as the inner holes of connector housings and the curved surfaces of antenna elements) ensure 100% surface sandblasting coverage with no missed or oversprayed areas. During mass production, Ra fluctuations are ≤±0.2μm, achieving far superior consistency compared to manual sandblasting.

　　Pre-treatment, sandblasting, and post-treatment are coordinated: Before sandblasting, aluminum parts are degreased and derusted (chemical cleaning + ultrasonic descaling) to prevent impurities from affecting sandblasting uniformity. Immediately after sandblasting, passivation treatment (chromate/chromium-free passivation) is performed to seal micropores on the aluminum parts, paving the way for subsequent plating/coating, and improving plating adhesion to ISO 2409 Class 0 (no peeling). 2. Micron-level CNC Precision Machining: Ensures 5G Part Assembly and Signal Adaptation Accuracy

　　CNC machining and sandblasting work in close collaboration to ensure critical dimensions meet stringent 5G requirements after sandblasting:

　　Machining - Sandblasting Dimension Compensation Design: The impact of sandblasting on dimensions is calculated in advance (for example, coarse sandblasting can remove 0.005-0.01mm from the part surface). This compensation is then accommodated during CNC machining. The final product maintains a stable tolerance of ±0.005mm-±0.01mm for key dimensions (e.g., 5G SMA connector pitch ±0.008mm, antenna element curvature tolerance ±0.01mm), meeting "zero-clearance assembly" requirements.

　　Complex Structure Molding: A five-axis CNC machine tool (positioning accuracy ±0.003mm) is used to machine the complex features of 5G parts, such as the concave cavity of base station filters (depth 10mm, coaxiality ≤0.008mm), and the heat sink fins of small base stations (wall thickness 0.3mm, pitch 0.01mm). 1.5mm±0.01mm), avoiding precision loss caused by multiple splicing steps, and maintaining structural integrity after sandblasting.

　　High-frequency signal adaptation processing: For 5G millimeter wave parts (such as antenna feeder connectors), surface flatness is controlled to ≤0.005mm/m during CNC machining. After sandblasting, precision grinding (local Ra ≤0.4μm) ensures the flatness of the signal transmission interface and reduces insertion loss (≤0.5dB), complying with the 3GPP 5G NR standard. 3. 5G-Specific Weathering and Interference Resistance: Suitable for Outdoor and Multi-Scenario Deployment

　　Designed for the "outdoor, high-temperature, high-humidity, and electromagnetically dense" deployment environments of 5G base stations, these components enhance their weather resistance and interference resistance:

　　Multi-layer anti-corrosion system: After sandblasting, it undergoes a composite treatment of "anodizing (10-15μm) + fluorocarbon spraying (20-30μm)." It withstands a neutral salt spray test for 1000 hours (far exceeding the 200 hours of traditional aluminum parts), making it suitable for base stations in coastal areas with high salt fog. It also passes a -40°C to 85°C temperature cycle test (1000 times) with a dimensional change of ≤0.002mm, preventing low-temperature cracking and high-temperature deformation.

　　Electromagnetic shielding optimization: Components requiring electromagnetic shielding, such as 5G RRU housings and connector housings, undergo a conductive oxidation treatment (surface resistance ≤10Ω/□) after sandblasting, or are sprayed with a conductive coating (silver/ Copper-based coating), electromagnetic shielding effectiveness (SE) ≥ 60dB (30MHz-1GHz), preventing external electromagnetic interference (such as radar and other communication equipment) from affecting 5G signals while also preventing internal signal leakage.

　　Waterproof and dustproof design: Sandblasted parts (such as base station antenna housings) are CNC-machined with precision sealing grooves (width 1.5mm ± 0.01mm, depth 0.8mm ± 0.005mm), combined with waterproof adhesive strips, achieving an IP67 protection rating. This prevents water ingress in rainy weather and dust accumulation in dusty conditions, ensuring long-term stable operation of the equipment. 4. Mass Production Guarantee: Meeting the needs of large-scale 5G base station deployment.

　　A comprehensive "automated processing - sandblasting - inspection" system has been established to ensure the quality and efficiency of mass delivery.

　　Automated production line: CNC machining utilizes robotic loading and unloading (capacity of 200 parts per hour), sandblasting utilizes a fully automatic sandblasting unit (capable of processing multiple parts simultaneously), and post-processing utilizes streamlined anodizing/spraying. Overall production capacity has increased fourfold compared to traditional processes, enabling the delivery of 10,000 qualified parts per day.

　　Full-dimensional quality inspection:

　　Surface inspection: A laser profilometer measures surface roughness after sandblasting (accuracy ±0.02μm), and a vision system verifies sandblasting uniformity (no missed or overspray).

　　Dimensional inspection: A three-dimensional coordinate measuring machine (accuracy ±0.001mm) spot-checks key dimensions, achieving a batch acceptance rate of ≥99%.

　　Performance testing: Ten parts are sampled from each batch for signal transmission testing (insertion loss/ Reflection loss), salt spray resistance testing, and electromagnetic shielding testing ensure performance meets standards.

　　Fast delivery response: Pre-processed blanks are available for common 5G parts (such as SMA connector housings and small base station heat sinks). The development cycle for customized parts (such as base station antenna elements) is shortened to 7-10 days. Urgent orders (in the thousands) can be delivered within 3 days, meeting the needs of "rapid deployment, expansion, and site expansion" for 5G base stations. 5G communication scenario testing demonstrates excellent signal quality and reliability.

　　5G base station antenna element: 240# fine sandblasting (Ra 1.2μm) + five-axis CNC machining (radian tolerance ±0.01mm), 26GHz millimeter wave return loss of 1.2dB (≤1.5dB), 15% greater signal coverage than traditional components, and no oxidation corrosion after one year of outdoor deployment.

　　RRU housing: 120# coarse sandblasting (Ra 2.8μm) + fluorocarbon spray coating, 1000 hours of salt spray resistance with no rust, 0.015mm (±0.005mm) clearance between internal modules, no water intrusion in rainy weather, and extended MTBF (mean time between failures) to 80,000 hours.

　　5G SMA connector housing: 320# fine sandblasting (Ra 0.8μm) + conductive oxidation, coating adhesion level 0, and stable contact resistance. 25mΩ (≤30mΩ), signal insertion loss increases by only 0.1dB after 1000 plugging and unplugging cycles, meeting 3GPP standards.

　　Small base station heat sink fins: Five-axis CNC machining (wall thickness 0.3mm ± 0.005mm) + 80# sandblasting (Ra 3.0μm). The heat dissipation area is 20% larger than traditional parts, and after sandblasting, heat dissipation efficiency is improved by 12%, reducing the temperature of the small base station by 5°C when operating at full load.

　　The "speed and stability" of 5G communications are inseparable from the "precision and strength" of components! This sandblasted aluminum CNC precision electronic component uses customized sandblasting to optimize high-frequency signal transmission, micron-level machining to ensure assembly accuracy, and weather-resistant and anti-interference treatment to adapt to outdoor deployment. Its mass production system supports large-scale base station construction. Whether it is core network equipment, macro base stations, small base stations, or terminal connectors, it can strengthen the "signal transmission defense line" of 5G networks and help achieve "high speed, wide coverage, and low latency" communication experience.

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