Quality appraisal of folding machine

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bending machine takes the synergy of high-precision bending and dynamic compensation as its core principle. By optimizing the bending pressure, angle control accuracy and mold life, it achieves the synergy of plate bending angle consistency, straightness and production efficiency. It is widely used in the fields of sheet metal processing, electrical cabinets, automotive parts and construction metal components. In thick plate bending, it is used to accurately form V-grooves of steel plates above 20mm; in stainless steel bending, it meets the requirement of no indentation on the surface; in multi-pass bending, it ensures the effectiveness of the springback compensation algorithm. Compared with traditional equipment, high-end folding machines have features such as intelligent deflection compensation, multi-axis backgauge positioning and mold quick-change systems, and are the core equipment of the metal forming process.

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

As the demand for high-precision sheet metal increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive bending angle, failure of springback compensation;

2, material defects: peeling off of the hardened layer on the surface of the mold, aging rate of hydraulic cylinder seals;

3, process problems: back gauge positioning repeatability, hydraulic synchronization error;

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

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

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According to the characteristics of the folding machine, common quality identification technical methods include:

1, appearance inspection

Appearance inspection is the first step in identification. We will check the appearance of the folding machine for obvious damage, deformation, rust, etc. For example, whether there are cracks in the rack, whether there are signs of wear on the tools, whether there are signs of moisture in the electrical box, etc. Appearance inspection can initially determine the usage status of the equipment and whether there are obvious quality problems.

2, performance test

Performance test is the core content of the identification. We will test various performance indicators of the folding machine in accordance with the requirements of the technical contract and industry standards. For example, test folding accuracy, folding speed, pressure stability, etc. Through performance testing, you can accurately evaluate whether the actual performance of the equipment meets the requirements.

03, electrical system inspection

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2 conducts comprehensive inspection of the electrical system, including checking the working status of the electrical components, whether the line connections are firm, and whether the insulation performance is good, etc. Use professional electrical testing equipment, such as multimeters, insulation resistance testers, etc., to conduct detailed testing of the electrical system to discover potential electrical faults.

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44, Hydraulic system inspection

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6For the hydraulic system, we will check the quality and quantity of the hydraulic oil, and detect the working performance of the hydraulic pump, relief valve, cylinder and other components. Through pressure testing, flow testing and other methods, determine whether there are leaks, pressure instability and other problems in the hydraulic system.

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A sheet metal factory of the applicant signed a "CNC Bending Machine Purchase Contract" with an equipment manufacturer of the respondent, agreeing on a bending angle of ±0.5°. After being put into production, the angle deviation reached ±1.8°. The manufacturer argued that it was caused by uneven thickness of the plates.

Identification analysis results:

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

The backgauge positioning repeatability accuracy of the folding machine involved in the case is ±0.12mm (agreement ±0.05mm), and the mold hardened layer HV 550 (protocol ≥ 600); the hydraulic system synchronization error is ±8% (protocol ±3%), resulting in compensation failure.

The appraisal conclusion determined that the mechanical accuracy of the equipment and material defects were the main reasons for the out-of-tolerance.

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Folding machine quality appraisal report should include:

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

2, involved equipment model, CNC system version, operation and maintenance records;

3, detection method and equipment list (such as laser Light tracker, direct reading spectrometer);

4, correlation analysis between detection data and failure (such as the impact of hydraulic error on angular deviation);

05, clarify the quality responsibility determination 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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