Quality appraisal of automatic spray painting equipment

automatic spray painting equipment takes the synergy of electrostatic adsorption and paint atomization as the core principle. By optimizing spray pressure, atomization effect and paint utilization rate, it achieves synergy of coating thickness uniformity, surface finish and environmental compliance. It is widely used in automated painting production lines of automobile bodies, home appliance casings, metal components and wood products. In automobile painting, it is used for efficient coverage of electrophoretic paint and topcoat; in the field of home appliances, it meets the requirements for orange peel-free spraying of complex curved surfaces; in anti-corrosion engineering, it ensures the salt spray resistance of the coating. Compared with traditional equipment, automatic painting equipment has the characteristics of closed-loop feedback control, multi-gun collaborative path planning and intelligent cleaning, and is the core equipment of green painting.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for automatic spray painting equipment. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of automatic spray painting equipment.

With the upgrade of environmental protection regulations and coating processes, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: coating adhesion does not meet the standard, VOCs emission exceeds the standard;

2, material defects: nozzle wear-resistant coating peeling, high-voltage cable insulation performance Deterioration;

3, process problems: atomization air pressure fluctuations, electrostatic voltage deviation;

4, contract performance disputes: core modules (such as imported high-voltage generators, intelligent paint supply systems) are inconsistent with the technical agreement.

According to the characteristics of automatic spray painting equipment, common quality identification technical methods include:

1, equipment appearance inspection

Inspect the appearance of the equipment, including the overall structure of the equipment, the installation of parts, the quality of the surface coating, etc. Check the equipment for obvious damage, deformation, corrosion, etc. For example, check whether the shell of the equipment is cracked or deformed, and whether the nozzle of the spray gun is blocked, etc.

2, performance test

In accordance with the requirements of the technical contract and relevant standards, various performance indicators of the equipment are tested. For example, test the spraying accuracy, spraying speed, spraying uniformity, etc. of the equipment. Through performance testing, it can be judged whether the equipment can meet the requirements of the production process.

0

The applicant, an automobile factory, and the respondent, an equipment manufacturer, signed a "Purchase Contract for Automatic Body Painting Lines", agreeing on a coating thickness of ±8 μm. After being put into production, the coating deviation reached ±25μm. The manufacturer argued that it was caused by fluctuations in ambient temperature and humidity.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "automatic spray painting equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The nozzle atomization particle size of the automatic spray painting equipment involved in the case was D50 45μm (protocol ≤30μm), electrostatic voltage fluctuation ±8kV (protocol ±3kV); paint supply system flow deviation ±12% (protocol ±5%), resulting in uneven paint distribution.

The appraisal conclusion determined that defects in the atomization system and control accuracy were the main causes of quality.

Automatic spray painting equipment quality appraisal report should include:

1, appraisal purpose (such as environmental penalty attribution, performance verification) and reference standards;

2, involved equipment model, control system version, process parameter record;

3, detection method and equipment list (such as thickness gauge, gas chromatograph);

4, correlation analysis between test data and failure (such as the impact of atomized particle size on thickness uniformity);