Workpieces: Automotive body stamping parts, chassis stamping brackets, precision stamping gaskets, cover plates, sheet‑metal parts, structural steel stamping components, galvanized / cold‑rolled steel stampings

Main Contaminants: Stamping drawing oil, rust‑preventive oil, grease, iron chips and dust, stamping graphite powder, fingerprint oil stains, minor scale, polishing wax residues

Subsequent Processes: Welding, electrophoretic coating, spraying, electroplating, assembly sealing, precision fitting

Compliance Standards: ISO 16232 automotive component cleanliness; oil‑free, dust‑free, watermark‑free, no white spot rusting

I. Industry Pain Points for Automotive Stamping‑Part Cleaning

1. Stamped sheet‑metal parts feature large flat surfaces, numerous gaps and folded dead corners. Conventional spraying cannot fully remove residual drawing oil trapped in grooves and indentations.

2. Most workpieces are made of cold‑rolled steel or galvanized steel. Watermarks, whitening and flash rust tend to occur after cleaning, which imposes high requirements for drying and water quality.

3. Fine iron chips and dust adhere strongly to surfaces. Manual wiping and high‑pressure flushing fail to remove them, resulting in spray particles, welding porosity and electrophoretic defects in downstream processes.

4. Mass‑production workpieces demand consistent cleaning performance, no secondary contamination and compatibility with automated production lines.

5. Ultra‑thin precision stampings (gaskets, valve plates) are prone to deformation. Aggressive flushing or brushing is not permitted; only micro‑peeling via ultrasonic cleaning is suitable.

II. Two Standard Solutions (Sinobakr)

Solution A: Full‑automatic Pass‑through Aqueous Ultrasonic Cleaning Line (Mainstream for Mass Production, Cost‑Optimized)

Application Scenarios: Body sheet‑metal parts, chassis brackets, large‑size stampings, continuous mass production, pre‑treatment before spraying and electrophoretic coating.

Equipment Model: Bakr BK‑TS Pass‑through Special Ultrasonic Cleaning & Drying Line for Stamping Parts

Core Advantages: Continuous conveying, non‑stop production, thorough oil and chip removal, prevention of rust and white spots, compatible with full‑line automation.

Complete Process Flow (Continuous Production Line)

1. Feeding & Conveying: Mesh‑belt continuous conveying. Workpieces are laid flat without extrusion deformation, supporting mixed‑line production of various stamping part sizes.

2. High‑pressure Pre‑spray Rough Cleaning: 0.6‑1.2 MPa high‑pressure spraying to flush off surface dust, bulk iron chips and heavy drawing oil in advance. Reduces ultrasonic load and avoids contaminant carry‑over into ultrasonic tanks.

3. Multi‑stage Ultrasonic Main Cleaning (Core Process)

• Ultrasonic frequency: 28 kHz + 40 kHz sweep‑frequency ultrasonic, balancing heavy‑grease removal and fine‑dust cleaning to eliminate blind spots.

• Cleaning medium: Neutral / weak‑alkaline steel‑part‑specific degreaser with corrosion‑inhibitor formula, safe for galvanized layers and anti‑rust.

• Temperature control: Constant 50‑58 °C low‑temperature cleaning to prevent oxidation and whitening of steel parts.

• Ultrasonic power: Uniform full‑range output. Enhanced cavitation peeling for folded edges, grooves and indentations.

• Tank configuration: Circulating filtration + magnetic chip adsorption + bag‑type filtration to continuously separate iron chips and prevent re‑adhesion.

4. Circulating Fresh‑water Rinsing: Multi‑stage overflow rinsing to remove residual chemicals and suspended grease, avoiding watermarks and mottling.

5. DI‑Water Fine Rinsing: Final rinsing with deionized water to eliminate water‑borne residues, meeting high surface requirements for spraying and electrophoresis.

6. High‑power Air‑knife Water Shearing: Multi‑angle high‑pressure air knives blow away surface and crevice moisture of workpieces to reduce drying load significantly.

7. Hot‑air Circulating Drying: Constant‑temperature hot air at 80‑115 °C with full‑volume circulation. No residual water inside sheet‑metal gaps. Workpieces remain rust‑ and white‑spot‑free after cleaning.

8. Discharging & Inspection: Cleanliness sampling test and visual inspection for watermark‑free & oil‑free surfaces, ready for downstream processes.

Solution B: Vacuum Hydrocarbon Ultrasonic Precision Cleaning Machine (High‑end Precision Stampings, OEM Acceptable)

Application Scenarios: Precision stamping valve plates, sealing gaskets, thin‑sheet stampings, new‑energy precision sheet‑metal parts, high‑end assembled components requiring zero watermarks, zero oxidation and ultra‑high cleanliness.

Equipment Model: Sinobakr BK Closed‑type Vacuum Hydrocarbon Ultrasonic Cleaning Machine

Core Advantages: Zero wastewater discharge, anti‑rust, residue‑free, capable of controlling micron‑level particles, compliant with IATF16949 OEM cleanliness requirements.

Standard Automatic Multi‑station Process Flow

Automatic loading → Vacuum high‑pressure spray rough cleaning → 40/80 kHz dual‑frequency ultrasonic precision cleaning → Vacuum solvent displacement rinsing → Vapor‑bath fine cleaning → Low‑temperature vacuum drying → Automatic unloading

Process Highlights

1. Cleaning under vacuum removes air bubbles inside gaps for thorough cleaning of stamping grooves and stacked blind areas.

2. Hydrocarbon solvent powerfully dissolves drawing oil and stamping grease with complete removal of oil‑film residues.

3. Fully enclosed low‑temperature operation prevents oxidation, whitening and rusting of cold‑rolled and galvanized steel.

4. Distillation recovery of solvent achieves eco‑friendly zero‑discharge and satisfies green‑factory EHS assessment.