Cleaning Solution for Precision Stamped Parts

1. Applicable Workpieces & Cleaning‑related Challenges

Workpieces: Precision stamped parts for 3C electronics, automotive and new‑energy industries, including thin‑wall sheets made of stainless steel, copper and aluminum, spring plates, terminals, shielding covers, precision gaskets and special‑shaped small structural components.

Main Contaminants: Stamping‑drawing oil, rust‑preventive oil, fine metal chips, punching dust, fingerprint oil, residual polishing wax.

Key Difficulties: Thin‑walled workpieces are prone to deformation and surface scratches; dirt easily accumulates in folded corners, grooves and interlayers; copper and aluminum parts are vulnerable to oxidation and discoloration; mass‑production requires zero water spots and high‑level surface cleanliness, complying with precision‑assembly standards such as VDA19 and ISO16232.

2. Three Core Cleaning Processes

2.1 Vacuum Hydrocarbon Ultrasonic Cleaning (Top‑end Priority)

Suitable for: Automotive stamped parts, electronic terminals, shielding covers and cosmetic‑grade precision parts (ready‑for‑assembly after cleaning).

Process Flow: Automatic loading → Vacuum degassing pre‑wash → High‑frequency ultrasonic fine cleaning → Spray rinsing → Vapor degreasing → Sealed vacuum drying → Automatic unloading

Advantages: Vacuum eliminates air‑lock in gaps to thoroughly remove contaminants from dead corners; oxygen‑free sealed drying delivers zero water marks, whitening and oxidation outcomes; non‑corrosive to various metals and preserves workpiece luster; recyclable solvent, eco‑friendly and low‑cost for high‑end mass‑production.

2.2 Fully‑automatic Aqueous Ultrasonic Cleaning Line (Cost‑effective for Mass‑production)

Suitable for: Large‑batch stainless‑steel stamped parts and ordinary structural components, scenarios requiring high throughput with moderate budget.

Process Flow: Ultrasonic degreasing → Multi‑stage spray rinsing → Pure‑water fine rinsing → Air‑knife dehydration → Hot‑air drying

Advantages: Powerful removal of heavy oil and dust; fully automatic operation reduces labor cost; special neutral anti‑oxidation detergent prevents workpiece discoloration; multi‑stage filtration and oil‑water separation maintain stable water quality and high yield rate.

2.3 Drum‑type Precision Ultrasonic Cleaning (Dedicated to Tiny Small‑size Parts)

Suitable for: Mini gaskets, thin spring plates and micro irregular stamped parts which are easy to stack, scratch or miss‑cleaning.

Advantages: Soft tumbling inside drum combined with ultrasonic‑spray cleaning avoids hard collision to prevent deformation and scratches; solves floating‑part and stacking‑dead‑corner problems, ideal for bulk cleaning of micro‑components.

3. Key Process Control Points

1. Ultrasonic frequency matching: 40kHz / 80kHz high‑frequency ultrasound is adopted for thin sheets for gentle cleaning and prevents vibration‑induced damage.

2. Material protection: Special anti‑oxidation treatment for copper and aluminum parts to avoid darkening and luster loss; strict water‑spot control for stainless‑steel workpieces.

3. Drying management: Vacuum drying for premium‑grade parts; air‑knife dehydration plus stepped hot‑air drying for aqueous‑cleaned mass‑production parts to eliminate residual moisture.

4. Cleanliness support: High‑precision workpieces can be equipped with dust‑free unloading and dust‑proof storage to meet clean‑room assembly requirements.

4. Solution Selection Guide

‑ High‑end cosmetic parts, automotive & electronic precision stamped parts: Vacuum Hydrocarbon Cleaning (high‑cleanliness, oxidation‑free, direct assembly available) ‑ Large‑batch ordinary structural stamped parts: Fully‑automatic Aqueous Cleaning Line (high productivity, cost‑efficiency) ‑ Micro thin sheets & mini components: Drum‑type Ultrasonic Cleaning (scratch‑resistant, no blind cleaning zones)

5. Acceptance Standards after Cleaning

1. No oil contamination, dust, metal chips or fingerprint residues on workpiece surfaces.

2. Free of water spots, watermarks, white specks, yellowing, darkening and oxidation discoloration.

3. No residual contaminants inside gaps, grooves and interlayers, meeting requirements of precision assembly and clean‑room incoming inspection.

4. Particle cleanliness test compliant with VDA19, ISO16232 standards.