Sandblasting machine quality appraisal

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sandblasting machine takes the synergy of high-speed abrasive impact and surface treatment as its core principle. By optimizing the sandblasting pressure, abrasive flow and nozzle wear resistance, it achieves the synergy of surface cleanliness, roughness and processing efficiency. It is widely used in the fields of metal anti-corrosion, ship maintenance, aerospace and mold cleaning. In the anti-corrosion of steel structures, it is used for high-standard pretreatment of Sa3 level cleanliness; in the refurbishment of automobile wheels, it meets the demand for non-damaging sandblasting of aluminum alloy surfaces; in precision molds, it ensures the uniformity of micron-level roughness. Compared with traditional equipment, high-end sandblasting machines have the characteristics of intelligent control, environmentally friendly dust removal, and multi-abrasive compatibility, and are the core equipment of surface engineering.

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

As surface treatment standards improve, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: surface cleanliness is not up to standard, roughness deviation;

2, material defects: tungsten carbide coating on the nozzle peels off, dust removal filter bag rupture;

3, process problems: sand blasting pressure fluctuations, abrasive circulation system clogging rate;

4, contract performance disputes: core modules (such as imported air compressors, intelligent control system versions) are inconsistent with the technical agreement.

0 Such cases need to pass surface morphology analysis, abrasive consumption test and dynamic pressure verification to clarify the quality responsibility.

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Sandblasting machine quality appraisal technical methods mainly include:

1, Appearance inspection

Conduct a comprehensive inspection of the appearance of the automatic non-standard sandblasting machine equipment, including the flatness of the frame, the quality of the surface coating, and whether the connections of each component are firm, etc. Check for obvious defects such as deformation, cracks, damage, etc. These appearance problems may affect the overall performance and service life of the equipment.

2, performance test

In accordance with the technical contract and relevant industry standards, various performance indicators of the equipment are tested. For example, test parameters such as sandblasting pressure, sandblasting flow rate, and sandblasting speed to check whether the equipment can stably reach the specified values. It is also necessary to evaluate the sandblasting effect, such as whether the roughness, cleanliness, coverage, etc. of the workpiece surface meet the requirements.

03, safety performance check

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2Safety performance is one of the important contents of equipment identification. Check whether the equipment's safety protection devices are complete and effective, such as protective door interlocking devices, leakage protection devices, etc. Ensure that the equipment does not pose a threat to the operator's personal safety during operation.

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A shipbuilding factory of the applicant signed a "Purchase Contract for Large Steel Plate Sandblasting Machine" with an equipment manufacturer of the respondent, agreeing on a cleanliness level of Sa3. After being put into production, the cleanliness level was only Sa2 level. The manufacturer argued that it was caused by severe corrosion of the steel plate.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "sandblasting machine", contract technical agreement, on-site investigation case materials and other data, and made the following quality scores Analytical opinion:

The nozzle outlet pressure of the sandblasting machine involved in the case is only 0.5MPa (agreement ≥ 0.7MPa), the abrasive flow rate is 280kg/h (agreement ≥ 350kg/h); the thickness of the tungsten carbide coating is only 0.3mm (agreement ≥ 0.5mm), resulting in kinetic energy attenuation.

The appraisal conclusion concluded that defects in the equipment’s power system and materials were the main causes of insufficient cleanliness.

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Sandblasting machine quality appraisal report should include:

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

2, equipment model involved, technical agreement, operation and maintenance records;

3, testing method and equipment list (such as roughness meter, SEM);

4, analysis of the correlation between test data and failure (such as the impact of insufficient pressure on cleanliness);

05, clarify the quality responsibility judgment conclusion and technical basis;

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26, signature of the appraiser, mechanical engineer qualification certificate and official seal of the organization.

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