Sinobakr has specialized in industrial precision cleaning for 26 years, focusing on complete cleaning solutions for die-cast aluminum housings used in new energy vehicles and servo motors. Targeting common pain points including hidden metal chips inside cavities, blind holes, threaded holes, cooling fins, deep holes, as well as residual cutting fluid, grinding fluid and release agents, we offer three major process routes tailored for small-batch trial production, mass assembly lines, and new energy electric drive housings requiring ultra-high cleanliness. Customized complete machines, tooling fixtures and cleanliness testing services are available for full delivery.

I. Core Cleaning Challenges for Motor Housings (Prerequisites for Cleaning)

Most motor housings are made of die-cast aluminum alloy. Contaminants generated after machining include cutting fluid, emulsion, anti-rust oil, aluminum scraps, carbonized release agent deposits and fine dust. Poor cleaning results will lead to the following problems:

1. Residual grease reduces motor insulation performance and causes electric leakage or short circuits;

2. Aluminum debris trapped in holes hinders assembly and results in excessive operating noise;

3. Residual moisture triggers aluminum surface whitening and oxidative corrosion;

4. Poor adhesion of subsequent coatings leading to paint peeling.

Conventional water washing and manual air blowing cannot meet the ISO 16232 cleanliness standard for automotive components.

II. Comparison of Three Mainstream Sinobakr Cleaning Process Solutions

Solution 1: Vacuum Fully-Enclosed Hydrocarbon Cleaning (Premium Choice, Standard for New Energy Vehicle Main Drive Motor Housings)

Applicable Scenarios: Main drive motors for electric vehicles, high-precision servo motors, applications requiring ultra-high cleanliness prior to assembly, complex structures with numerous blind holes and inner cavities, working conditions where watermarks and residues are strictly prohibited.

Core Equipment: BK-CH Series Vacuum Ultrasonic Hydrocarbon Cleaning Machine (Integrated Multi-Station Unit)

Integrated functions: Ultrasonic immersion, high-pressure rotary spraying, vacuum vapor degreasing, double solvent rinsing, fully enclosed vacuum drying, and closed-loop solvent distillation regeneration system.

Standard Fully Automatic PLC One-Click Process Flow

1. Pre-treatment: Workpiece loading & positioning via tooling → 0.4 MPa high-pressure air blowing to remove bulky aluminum chips and reduce primary cleaning load

2. Vacuum Ultrasonic Main Cleaning: Modified eco-friendly hydrocarbon solvent, operating temperature: 55~70°C, 40 kHz ultrasonic cavitation. Negative vacuum pressure enhances solvent penetration to strip grease and micro aluminum debris from threads and deep holes; duration: 3~6 minutes

3. Primary Clean Rinsing: Overflow rinsing with fresh pure solvent to carry away trapped contaminants

4. Precision Vacuum Vapor Rinsing: Infiltration via solvent vapor under vacuum to eliminate residual dirt in tiny gaps

5. Fully Enclosed Vacuum Drying: Oxygen-free vacuum baking throughout the process, delivering watermark-free and moisture-free surfaces without aluminum whitening oxidation

6. Unloading & Random Cleanliness Inspection

Key Advantages

1. Superior Cleanliness: Particulate contaminants ≤200 μm, residual oil content ＜30 mg/㎡, fully compliant with strict standards for automotive-grade motors; no dead cleaning zones inside blind holes and inner cavities

2. Eco-friendly & Safe: Low-VOC, non-toxic and odorless hydrocarbon solvent; explosion-proof fully enclosed vacuum design eliminating open flame risks; solvent distillation recovery rate ≥98%, extremely low consumable costs

3. Material Compatibility: No corrosion, darkening or dullness on die-cast aluminum; compatible with cast aluminum and cast iron housings

4. Zero wastewater discharge; compatible with automated production lines for unmanned operation

Solution 2: Water-Based Fully Automatic Ultrasonic Spray Cleaning Line (Cost-Effective Mass Production Option for General Servo/Stepper Motor Housings)

Applicable Scenarios: Standard structured motor outer casings prioritizing appearance requirements, medium cleanliness demands, large daily output and factory budget constraints.

Process Flow

Loading → High-pressure coarse spraying (30~50 bar to flush heavy surface grease and aluminum scraps) → Fine ultrasonic cleaning with water-based detergent → Two-stage deionized water rinsing → Air knife water removal → Hot air drying → Unloading

• Cleaning Agent: Sinobakr special neutral water-based degreaser for aluminum materials, weakly alkaline formula with aluminum corrosion inhibitors to prevent aluminum darkening and corrosion; diluted 5~15 times for use, working temperature: 50~65°C