Quality appraisal of steel plate coiling machine

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steel plate rolling machine takes the synergy of roll forming and mechanical control as its core principle. By optimizing roller pressure, rolling speed and curvature accuracy, it achieves the synergy of steel plate rolling roundness, no indentation on the surface and production efficiency. It is widely used in the fields of oil pipelines, wind power towers, pressure vessels and steel structure manufacturing. In thick plate rolling, it is used for cold bending of steel plates above 40mm; in the field of high-strength steel, it meets the plastic deformation control requirements of Q690 materials; in thin-walled tube production, it ensures the coaxiality of the cylinder. Compared with traditional equipment, the steel plate rounding machine has the characteristics of intelligent compensation, multi-roller coordination and pre-bending functions, and is the core equipment of the metal rounding process.

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

With the popularization of high-strength steel applications, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: the rolling radius is out of tolerance and the straight end section exceeds the standard;

2. Material defects: insufficient hardness of the surface hardened layer of the roller shaft and shrinkage rate of the bearing seat casting;

3, process problems: hydraulic synchronization error, upper roller deflection compensation failure;

4, contract performance dispute: core modules (such as imported servo hydraulic systems, high-precision displacement sensors) are inconsistent with the technical agreement.

0 Such cases need to pass molding accuracy testing, material failure analysis and dynamic load verification to clarify the quality responsibility.

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1, equipment appearance inspection

conducts a comprehensive inspection of the appearance of the equipment, including the overall structure of the equipment, the surface quality of the parts, and the fastening of the connection parts, etc. Check for obvious damage, deformation, corrosion, etc., which may affect the normal operation and service life of the equipment.

2, technical parameter detection

According to the technical contract and relevant standards, various technical parameters of the equipment are tested. For example, measure the dimensional accuracy such as the diameter, roundness, and wall thickness deviation of the rolling circle; detect the rolling speed, torque, power and other performance indicators of the equipment; check whether the parameters of the electrical control system meet the requirements.

3, running performance test

0 Let the device actually run and observe its operating status and performance. Test the stability, reliability, degree of automation, etc. of the equipment, and check whether there are any abnormal phenomena during operation of the equipment, such as vibration, noise, jamming, etc.

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24, material quality analysis

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4If the quality problem of the equipment may be related to the material, the appraisal agency will conduct a material quality analysis of the key parts of the equipment. Through chemical analysis, metallographic examination and other methods, determine whether the material's composition, organizational structure and performance meet the requirements.

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A pressure vessel factory of the applicant signed a "40mm rounding machine purchase contract" with an equipment manufacturer of the respondent, and it was agreed that the ovality should be ≤0.8%. After being put into production, the ovality reached 2.5%. The manufacturer argued that it was caused by improper setting of operating parameters.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "steel plate rounding machine", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The upper roller deflection compensation of the steel plate rounding machine involved failed (deflection deviation>1mm), the roller hardened layer HRC 50 (agreement ≥ 55); the synchronization error of the hydraulic system is ±8% (agreement ±3%), resulting in uneven pressure on the side rollers.

The appraisal conclusion determined that equipment control system and material defects were the main causes of quality.

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Steel plate rounding machine quality appraisal report should include:

1, appraisal purpose (such as production accident attribution, performance verification) and reference standards;

2, involved equipment model, control program version, production record;

3, testing method and equipment list (such as Laser tracker, direct reading spectrometer);

4, correlation analysis between detection data and failure (such as the impact of deflection deviation on ovality);

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

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

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