Vacuum impregnation equipment quality appraisal

vacuum impregnation equipment takes the synergy of negative pressure penetration and pressure impregnation as the core principle. By optimizing the vacuum degree, impregnation pressure and temperature control accuracy, it achieves the synergy of material pore filling rate, resin curing uniformity and process stability. It is widely used in motor windings, electronic component packaging, carbon fiber composite materials and insulation material processing and other fields. In motor maintenance, it is used to deeply penetrate the insulating paint of stator windings; in the electronics industry, it meets the three-proof (moisture-proof/anti-salt spray/anti-mold) coating requirements of PCB boards; in composite material manufacturing, it ensures uniform resin impregnation of carbon fiber preforms. Compared with the traditional impregnation process, vacuum impregnation equipment has the characteristics of high penetration efficiency, excellent environmental protection and intelligent control, and is the core equipment for high-precision material processing.

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

As precision manufacturing requirements increase, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: insufficient pore filling rate and poor thickness after curing;

2. Material defects: poor corrosion resistance of the vacuum pump and insufficient temperature resistance of the sealing ring;

3, process problems: vacuum system leakage rate, pressure fluctuation during pressure impregnation stage;

4, contract performance dispute: core modules (such as molecular pump set, resin preheating system) are inconsistent with the technical agreement.

Vacuum impregnation equipment quality appraisal technical methods mainly include:

1. Appearance inspection

Check whether the appearance of the equipment meets the standard requirements and whether there are scratches, deformations, corrosion and other defects.

2. Functional test

conducts functional tests in accordance with the technical contract to verify whether the equipment can complete functions such as vacuum extraction, dipping and feeding, and pressure maintenance as required.

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A motor manufacturer of the applicant signed a "Vacuum Impregnation Line Purchase Contract" with an equipment manufacturer of the respondent, agreeing that the winding filling rate is ≥98%. After being put into production, the insulating paint penetrated unevenly (actually measured 85%). The manufacturer argued that it was caused by the resin viscosity being too high.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "vacuum impregnation equipment", contract technical agreements, on-site investigation case materials and other data, and made the following qualitative analysis Quantitative analysis opinion:

The vacuum pump limit of the vacuum impregnation equipment involved in the case is only 50Pa (agreement ≤10Pa), the resin preheating temperature deviation is ±15℃ (agreement ±5℃); the fluorine content of the sealing ring is only 58% (agreement ≥66%), and the vacuum leakage rate is 1.5×10^-1 Pa·m³/s (agreement ≤1×10^-2).

The appraisal conclusion concluded that the vacuum system and material defects of the equipment were the main causes of penetration failure.

Vacuum impregnation equipment quality appraisal report should include:

1, appraisal purpose (such as process failure attribution, environmental compliance verification) and reference standards;

2, involved equipment model, process parameters, maintenance records;

3, detection method and equipment cleaning Single sheet (such as helium mass spectrometer, industrial CT);

4, correlation analysis between test data and failure (such as the impact of vacuum degree on filling rate);