Project Background
Amid the booming “aesthetic economy” and rising demand for professional medical aesthetics, a leading global beauty equipment manufacturer launched a 2026 customization project. It required 1,200 precision sheet metal enclosures for thermostats used in core beauty devices—including photon skin rejuvenation machines, radiofrequency (RF) tightening equipment, and laser hair removal terminals—deployed across high-end medical aesthetics clinics, chain salons, and mobile beauty service vehicles.
Core requirements tailored to the beauty industry’s unique demands included:
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Medical-grade safety compliance: Conform to ISO 13485 medical device standards and biocompatibility requirements (no skin irritation risk from direct contact);
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Precision temperature control: Stabilize operating temperatures between 37–42℃ (optimal for skin care) with ±0.1℃ accuracy to avoid burns or ineffective treatments;
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Corrosion & moisture resistance: Withstand frequent contact with skincare ingredients (ethanol, salicylic acid) and high-humidity environments (e.g., steam rooms);
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Aesthetic & ergonomic design: Soft curves, matte luxury finishes (champagne gold, matte white), and rounded edges (to prevent scratches during handheld use);
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EMC shielding: Reduce electromagnetic interference to ensure stable device performance during sensitive skin treatments;
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Batch consistency: Uniform dimensions and color (ΔE ≤1) to maintain brand image across global salon chains.
Sanjun Hardware was selected for its proven track record in industrial sheet metal customization, medical-grade quality control, and expertise in balancing functionality with beauty industry aesthetics.
Manufacturing Process of Core Sheet Metal Components
Sanjun’s production integrated beauty industry-specific needs into every link, focusing on the enclosure’s key parts: front control panel, heat-dissipating structure, ergonomic handle, and sealed inner frame.
1. Material Selection
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Main Enclosure: 1.2mm medical-grade 304 stainless steel—corrosion-resistant to skincare chemicals and compliant with biocompatibility standards (ISO 10993);
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Heat-Dissipating Panels: 1.0mm 6061-T6 aluminum alloy—enhances thermal conductivity by 15% to prevent overheating during prolonged treatments;
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Front Panel: 1.2mm SPCC cold-rolled steel with anti-fingerprint coating—supports high-precision hole cutting for control buttons and display screens while maintaining a sleek finish.
2. Core Craftsmanship
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Laser Cutting: A 4000W fiber laser (±0.05mm tolerance) cut slanted 30° heat-dissipating slots (to block moisture ingress) and precision holes for temperature sensors/control interfaces. Burr-free edges (Ra ≤0.8μm) eliminated skin irritation risks;
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CNC Bending: An 8-axis AMADA brake formed soft curved contours and integrated ergonomic handles (ergonomically designed for 1–2 hour handheld use). Custom 3D jigs prevented springback, ensuring rounded edges (R3mm);
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Laser Welding: 1500W fiber welding joined seams with weld width ≤1mm—minimizing thermal deformation and avoiding gaps that could trap skincare residue;
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Surface Treatment:
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Pre-treatment: Ultrasonic cleaning + nitric acid passivation to remove oil and strengthen corrosion resistance;
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Finishing: Electrostatic powder coating in matte white or champagne gold (60μm thickness)—9H hardness, scratch-resistant, and easy to wipe clean after contact with creams.
3. Quality Control
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Dimensional & Functional Testing: Coordinate Measuring Machine (CMM) verified interface accuracy (±0.03mm); temperature stability tests simulated 8-hour continuous operation (no deviation beyond ±0.1℃);
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Safety & Aesthetic Inspections: 100% salt spray testing (480 hours, no corrosion); color difference detection (ΔE ≤1); and edge smoothness checks (no sharp points).
Project Challenges & Sanjun’s Solutions
1. Challenge: Corrosion from Skincare Chemicals & High Humidity
Skincare products and steam could degrade ordinary metal surfaces, leading to rust or skin irritation.
Solution: Combined medical-grade 304 stainless steel, passivation treatment, and 60μm thick anti-corrosion coating—passed 480-hour salt spray tests and 6-month simulated skincare residue exposure.
2. Challenge: Precision Temperature Control vs. Aesthetic Design
Heat-dissipating slots were necessary but risked ruining the enclosure’s sleek look; excessive slots could weaken structural rigidity.
Solution: Optimized slanted 30° heat slots (hidden on the side/back) + aluminum alloy panels—improved airflow by 20% while preserving the enclosure’s minimalist design.
3. Challenge: Batch Consistency for Global Brand Aesthetics
The client required uniform color and dimensions across 1,200 units to maintain brand consistency across international salons.
Solution: Automated electrostatic spraying + batch color-difference detection (100% inspection per 50 units); automated loading/unloading for laser cutting—controlled dimensional deviation to ≤0.1mm.
4. Challenge: EMC Shielding for Sensitive Beauty Treatments
Electromagnetic interference could disrupt thermostat accuracy, affecting treatment safety.
Solution: Added a conductive shielding layer inside the enclosure + optimized grounding design—reduced EMI by 30%, ensuring stable temperature control during RF/laser treatments.
Project Outcomes
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Delivery: 1,200 enclosures were delivered 4 days ahead of the 35-day deadline, with a 100% pre-delivery inspection pass rate (including FDA and CE compliance certifications);
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Field Performance: After 8 months of use in 200+ global venues, the enclosures showed 0 corrosion, 0 temperature deviation, and 0 aesthetic defects. Salons reported improved client satisfaction due to safer treatments and sleek device appearance;
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Client Collaboration: The manufacturer placed a follow-up order for 1,800 units, citing Sanjun’s “deep understanding of beauty industry pain points—balancing medical-grade safety, precision, and luxury aesthetics” as a key competitive advantage.
