Clay sand production line equipment quality appraisal

clay sand production line equipment is based on the core principle of synergy between molding sand performance control and process stability. By optimizing sand mixing uniformity, compaction rate control and old sand regeneration efficiency, it achieves the synergy of high air permeability, high compressive strength and low gas generation of foundry sand. It is widely used in the clay sand casting field of automotive parts, engineering machinery and hardware castings. In the automated molding line, it is used for the continuous sand supply of the sand treatment system; in the field of precision casting, it meets the high fluidity requirements of the molding sand for thin-walled castings; in the environmental upgrade, it ensures that the dust emission of the old sand regeneration system is ≤10mg/m³. Compared with traditional sand processing equipment, the clay sand production line has the characteristics of energy consumption optimization, intelligent control and high system integration. It is the core equipment of the green casting process.

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

As the requirements for clean production in the foundry industry have been upgraded, related quality dispute cases have increased significantly. The focus of judicial disputes is:

1. Disputes over performance indicators: deviations in the wet compressive strength of the molding sand, excessive burning loss of old sand regeneration;

2. Material defects: insufficient thickness of the wear-resistant layer of the sand mixer blades, and the fracture life of the vibrating screen mesh. ;

3, process problems: sand temperature adjustment accuracy deviation, dust removal system air volume attenuation;

4, contract performance dispute: core modules (such as double-disk cooler heat exchange area, rotor regenerator crushing efficiency) are not in line with the technical agreement.

Clay sand production line equipment litigation quality appraisal mainly includes the following technical methods:

1. Appearance inspection: Check the overall appearance, structural dimensions, material specifications, welding quality, etc. of the rotary drum dryer.

2. Performance test: Test the drying capacity, thermal efficiency, energy consumption and other performance indicators of the drum dryer.

3. Material analysis: analyze the composition, hardness, wear resistance, etc. of the materials used in the drum dryer.

4. Process evaluation: Evaluate whether the manufacturing process of the rotary drum dryer meets the design requirements and whether there are defects or errors.

A foundry of the applicant signed a "40t/h Clay Sand Regeneration Line Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the wet compressive strength of the molding sand is ≥0.18MPa. After being put into production, the pore defect rate of the castings exceeded 30%. The manufacturer argued that it was caused by the poor quality of the raw material bentonite.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "Clay Sand Production Line Equipment", contract technical agreements, on-site investigation case materials and other data, and made a decision The following quality analysis opinions:

The sand mixer of the clay sand production line equipment involved in the case has insufficient effective sand mixing time (agreed 120 seconds, actual measurement 80 seconds), the strength of the molding sand is only 0.12MPa; the ignition loss of old sand reaches 4.2% (agreed ≤ 2.5%), and the recycled sand microcracks account for 12%.

The appraisal conclusion determined that defects in the sand mixing process and regeneration system were the main causes of quality.

Clay sand production line equipment quality appraisal report should include:

1, purpose of appraisal (such as casting defect attribution, environmental compliance verification) and reference standards;

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

3, testing methods and equipment clearance Single (such as molding sand tester, dust detector);

4, correlation analysis of test data and failure (such as the impact of sand mixing time on strength);