Wire rolling mill quality appraisal

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wire rod rolling mill takes the cooperation of plastic deformation and rolling force control as the core principle. By optimizing the roll pass design, rolling speed matching and temperature control accuracy, it achieves the coordination of wire rod dimensional accuracy, surface quality and production efficiency. It is widely used in fields such as construction steel bars, steel wire ropes, metal products and automobile parts. In high-speed wire rod production, it is used to control the microstructure of the controlled rolling and controlled cooling process; in the field of special steel, it meets the high surface quality requirements of stainless steel and bearing steel; in metal deep processing, it ensures the mechanical properties of the wire rod. Compared with traditional rolling mills, wire rod rolling mills have the characteristics of dynamic reduction compensation, multi-stand collaborative control and intelligent diagnosis. They are the core equipment for efficient and precise forming of metal wire rods.

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

As the precision requirements for wire products increase, related quality dispute cases have increased significantly. The focus of judicial disputes is:

1. Disputes over performance indicators: excessive wire size and insufficient roll life;

2. Material defects: uneven surface hardness of the rolls and shrinkage defects in the bearing seat castings;

3, process problems: rolling force fluctuations, looper tension control failure;

4, contract performance disputes: key modules (such as hydraulic AGC system, eddy current flaw detector) are inconsistent with the technical agreement.

0 Such cases require clear quality responsibility through rolling force testing, microstructure analysis and dynamic parameter tracing.

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Wire rod rolling mill 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.

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A steel plant of the applicant signed a "High-speed Wire Rod Mill Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the roll life should be ≥100,000 tons. After being put into operation, cracks on the roll surface appeared after rolling only 60,000 tons. The manufacturer argued that it was caused by impurities in the cooling water.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "wire rod rolling mill", contract technical agreement, on-site inspection case materials and other data. After analysis, the following quality analysis opinions were made:

The surface hardness gradient of the wire rod rolling mill roll involved in the case exceeded the standard (HSD=5), and the Cr content was only 2.8% (agreement ≥3.5%); the blocking rate of the cooling nozzle of the rolling mill was 30%, resulting in a decrease in local tempering hardness HRC 5; Bearing seat casting shrinkage defect (Φ8mm), causing abnormal vibration under dynamic load.

The appraisal conclusion concluded that material composition and cooling system defects were the main causes of roll failure.

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Wire rod rolling mill quality appraisal report should include:

1, purpose of appraisal (such as roll life dispute, performance verification) and cited standards;

2, equipment model involved, roll batch, production record;

3, testing method and equipment list (such as laser Diameter, electro-hydraulic servo testing machine);

4, analysis of the correlation between test data and failure (such as the impact of hardness gradient on wear resistance);

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

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

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