Quality Identification of Precision Shearing Machines

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precision shearing machine takes the synergy of high-precision dynamic shearing and servo control as its core principle. By optimizing the blade gap adjustment accuracy, shearing force stability and feeding positioning error, it achieves efficient slitting of metal sheets, synergy between section quality and material utilization. It is widely used in fields such as automotive sheet metal, electronic components, precision hardware and new energy battery pole piece processing. In automobile manufacturing, it is used for laser welded plate slitting of high-strength steel plates; in the lithium battery industry, it meets the burr-free cutting requirements of copper and aluminum foil pole pieces; in the processing of home appliance panels, it ensures clean cross-sections of stainless steel plates. Compared with traditional shearing equipment, precision shearing machines have features such as multi-axis synchronous control, intelligent blade wear compensation and energy efficiency optimization, and are the core equipment for high-precision material processing.

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

With the upgrade of material processing accuracy, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: excessive shear size and excessive cross-section roughness;

2. Material defects: peeling off of the carbide coating of the blade and insufficient wear resistance of the guide rail;

3, process problems: hydraulic system pressure fluctuations, servo feeding synchronization errors;

4, contract performance disputes: core modules (such as high-precision encoders, adaptive tension control systems) are inconsistent with the technical agreement.

0 Such cases require shearing accuracy verification, material failure analysis and dynamic parameter tracing to clarify the quality responsibility.

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Precision shearing machine quality appraisal technical methods mainly include:

Appearance inspection: Check whether the dimensions, surface flatness, paint coating, etc. of the precision shearing machine meet the standard requirements.

Geometric accuracy inspection: Check the shearing machine's tool angle accuracy, platen parallelism, relative position of the upper and lower tool rests and other geometric dimensional accuracy.

Cutting performance test: Use standard specimens to conduct shear tests to evaluate the cutting quality, shearing force and other performance indicators of the precision shearing machine.

Durability test: Conduct long-term continuous shearing operation on a precision shearing machine to evaluate its durability and reliability.

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The applicant, a new energy company, signed a "Pole Shearing Machine Purchase Contract" with an equipment manufacturer, the defendant, and it was agreed that the burr height should be ≤0.01mm. During mass production, the burrs on the pole pieces reached 0.05mm, causing a short circuit in the battery. The manufacturer argued that it was caused by the difference in ductility of the copper foil.

identification analysis results:

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

The precision shearing machine blade gap adjustment mechanism involved in the case has a repeatability accuracy of ±0.02mm (agreement ±0.01mm), a blade edge fillet R value of 0.005mm (agreement ≤0.003mm); the feed clamp pressure fluctuation is ±15% (agreement ±5%), resulting in local deformation of the copper foil.

The appraisal conclusion concluded that defects in the equipment’s mechanical precision and control system were the main causes of excessive burrs.

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precision shearing machine quality appraisal report should include:

1, appraisal purpose (such as processing defect attribution, performance verification) and reference standards;

2, involved equipment model, control system version, maintenance records;

3, detection method and equipment list (such as laser interferometer, SEM);

4, correlation analysis between detection data and failure (such as the influence of blade fillet on burrs);

05,clear quality responsibility determination conclusion and technical basis;

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

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