In the fields of automobile manufacturing, maintenance and remanufacturing, parts cleaning is a core process that guarantees product yield, production efficiency, assembly accuracy and operational safety, rather than a simple decontamination operation. Targeting the structural characteristics, contamination types, batch scale and environmental compliance requirements of various automotive parts, this solution integrates mainstream cleaning technologies including ultrasonic cleaning, spray cleaning and hydrocarbon cleaning. It solves industry pain points such as poor adaptability of general-purpose equipment, failure to meet environmental standards and low yield rate, and provides an integrated cleaning solution featuring classified adaptation, high precision & efficiency, green energy saving and cost controllability. Covering the whole process from pretreatment and core cleaning to post-treatment, inspection and operation & maintenance, it meets the diversified cleaning demands for parts of traditional fuel vehicles and new energy vehicles.

I. Core Objectives of the Solution

• Qualified Cleanliness: Meet the cleanliness requirements of different parts by thoroughly removing oil stains, cutting fluid, metal debris, rust, carbon deposits and other contaminants on surfaces and in gaps. Comply with ISO 16232, VDA 19 and internal enterprise standards of automakers, and avoid assembly failures and reduced transmission accuracy caused by incomplete cleaning.

• Efficient Adaptation: Match dedicated cleaning processes and equipment according to production batch scale (hundreds to tens of thousands of pieces per day) and structural complexity (blind holes, gear gaps, thin-walled parts). Balance cleaning efficiency and workpiece protection to prevent scratches, deformation and other damages.

• Environmental Compliance: Strictly follow GB/T28677-2012 and local VOCs control regulations. Prioritize water-based eco-friendly cleaning agents and energy-saving equipment to achieve up-to-standard treatment of waste liquid and exhaust gas, eliminating risks of environmental violations.

• Cost Reduction & Efficiency Improvement: Reduce consumption of supplies, energy and labor costs, lower rework rate and improve overall production and operation efficiency through recycling of cleaning fluid, intelligent equipment operation & maintenance and process optimization.

II. Preparatory Work: Parts Inspection & Classification

Accurate matching of part characteristics is the premise of satisfactory cleaning effect. Comprehensive inspection and scientific classification shall be completed before cleaning to avoid low efficiency or workpiece damage caused by blind cleaning. Details are as follows:

1. Core Inspection Items

• Contaminant Inspection: Identify the type (cutting fluid, rust preventive oil, carbon deposits, metal debris, etc.) and content of contaminants, evaluate the pollution degree, and provide basis for cleaning agent selection and process parameter setting.

• Workpiece Characteristic Inspection: Confirm part materials (metal, plastic, aluminum alloy, carbon fiber, etc.), structural complexity (blind holes, gear gaps, cavities, thin-walled parts), dimensional accuracy and surface condition, check surface defects and prevent further damage during cleaning.

• Cleanliness Requirement Confirmation: Classify parts into core precision parts, ordinary structural parts and appearance parts, and set corresponding standards for particle size, quantity and residual chemical substances. For example, the particle size of core engine parts shall be controlled within 5 microns.

2. Scientific Classification Principles

Adopt four-level classification based on material + structure + pollution degree + cleanliness requirement to avoid cross-contamination and process waste caused by mixed cleaning:

1. Core Precision Parts: Engine cylinder blocks, cylinder heads, transmission gears, new energy vehicle battery housings, relay contacts, etc. Featuring complex structure and high cleanliness requirements, they require precision cleaning processes.

2. Ordinary Structural Parts: Chassis hardware, automotive fasteners, engine outer casings, etc. With simple structure and mild pollution, they are applicable to conventional high-efficiency cleaning processes.

3. Vulnerable & Sensitive Parts: Thin-walled aluminum battery housings, carbon fiber components, 3D printed parts, etc. Adopt low-damage targeted cleaning processes to avoid deformation or surface damage.

4. Remanufactured Parts: Used engine and transmission parts with heavy pollution, possible rust and carbon deposits. Pretreatment is required prior to formal core cleaning.

III. Core Cleaning Processes & Equipment Matching Solution

Combined with part classification and industrial practical cases, 7 mainstream cleaning technologies are integrated to clarify applicable scenarios, core parameters and actual effects of each process, realizing one set of solution for one type of workpiece. Details are as follows:

1. Ultrasonic Cleaning Process (Mainstream Core Process)

Leverage the cavitation effect generated by ultrasonic vibration to penetrate gaps and blind holes of workpieces for dead-angle-free cleaning, suitable for most precision automotive parts. Equipment is mainly divided into three types: single-tank, multi-tank and fully automatic.

Key Points: Ultrasonic frequency shall be precisely matched. Low frequency of 28KHz is adopted for large workpieces with heavy oil stains such as engine cylinder blocks; high frequency above 40KHz for tiny precision parts. Equipment shall be equipped with standard multi-stage filtration system to filter impurities below 0.5μm, extending the service life of cleaning fluid by more than 2 times.