Automatic punch quality appraisal

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automatic punching machine takes the synergy of high-precision positioning and stamping force control as its core principle. By optimizing stamping accuracy, stamping force and mold life, it achieves synergy of hole position consistency, edge finish and production efficiency. It is widely used in the automated processing fields of metal sheet metal, packaging materials, PCB boards and leather products. In automobile body manufacturing, it is used for precise punching of high-strength steel plates; in the electronics industry, it meets the micro-hole processing needs of FPC flexible circuit boards; in aviation composite materials, it ensures delamination-free punching of carbon fiber plates. Compared with traditional equipment, automatic punching machines have the characteristics of multi-axis linkage (visual positioning + servo drive), intelligent compensation (real-time correction of mold wear) and data traceability (storage of processing parameters for each hole), and are the core equipment of the precision stamping process.

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

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

1, performance index dispute: excessive stamping position, insufficient mold life;

2, material defects: insufficient hardness of the mold steel, peeling off of the wear-resistant coating of the guide sleeve;

3, process problems: stamping force fluctuations, multi-station synchronization errors;

4, contract performance disputes: core modules (such as imported servo motors, high-precision pressure sensors) are inconsistent with the technical agreement.

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

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Automatic punching machine quality appraisal technical methods mainly include:

1, equipment performance testing

The appraisal agency will detect various performance indicators of automatic punching non-standard equipment, including punching accuracy, punching speed, equipment stability, etc. By using professional testing equipment and methods, we can obtain accurate testing data and determine whether the performance of the equipment meets the requirements.

2, equipment structure inspection

Check the mechanical structure of the equipment to see if there are wear, deformation, looseness and other problems. Check whether all parts of the equipment are installed correctly and whether the connections are firm. For example, check whether the drilling head is installed accurately and whether the guide rail is well lubricated.

03, electrical system detection

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2 detects the electrical system of the equipment, including the performance of electrical components, the connection of electrical circuits, etc. Use electrical testing equipment to check whether the parameters of electrical components are normal, and check whether there are short circuits, open circuits and other problems in electrical circuits.

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44, software system evaluation

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6Evaluate the software system of the device to check whether the software functions normally and whether there are vulnerabilities. Evaluate whether the software's operation interface is user-friendly and whether the compatibility between software and hardware is good.

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The applicant, an auto parts factory, and the respondent, an equipment manufacturer, signed a "High Strength Steel Plate Automatic Punching Machine Purchase Contract", agreeing on a hole position accuracy of ±0.05mm. After being put into production, the hole position deviation reached ±0.15mm. The manufacturer argued that it was caused by uneven plate thickness.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "automatic punching machine", contract technical agreement, on-site inspection case materials and other data, and made the following quality analysis Analytical opinion:

The servo positioning repeatability accuracy of the automatic punching machine involved in the case is ±0.08mm (agreement ±0.03mm), the mold guide sleeve gap is 0.05mm (agreement ≤0.02mm); the Cr content of the mold steel is only 10% (agreement 12-14%), and the hardness is HRC 55 (agreement ≥58).

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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Automatic punching machine quality appraisal report should include:

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

2, involved equipment model, control system version, process parameter record;

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

4, correlation analysis between detection data and failure (such as the influence of guide sleeve clearance on hole position deviation);

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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