Glass bending and tempering equipment quality appraisal

glass bending and tempering equipment takes the synergy of hot bending forming and rapid quenching as the core principle. By optimizing the heating uniformity, bending mold accuracy and cooling rate, it achieves the synergy of precise curvature, tempering strength and safety performance of curved glass. It is widely used in fields such as building domes, automobile skylights, home appliances curved screens and curtain wall decoration. In automotive glass processing, it is used for complex curved surface forming of panoramic sunroofs; in architectural design, it meets the high-precision requirements of double-curvature glass curtain walls; in the field of home appliances, it ensures the impact resistance of 3D glass covers. Compared with ordinary tempering equipment, glass bending and tempering equipment has the characteristics of multi-stage temperature control (integrated heating-forming-quenching), intelligent mold adaptation and low energy consumption, and is the core equipment of high-end glass manufacturing.

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

With the expansion of curved glass applications, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: surface compressive stress does not meet the standard, glass self-explosion rate;

2, material defects: heating element resistivity deviation, ceramic roller heat-resistant fatigue life;

3, process problems: poor temperature uniformity of the heating furnace, uneven cooling efficiency of the air grille;

4, contract performance dispute: core modules (such as infrared temperature measurement system, high-precision mold library) are inconsistent with the technical agreement.

According to the characteristics of glass bending and tempering equipment, common quality identification technical methods include:

1. Visual inspection: Check whether there are obvious defects or damage in the appearance, structural parts, and components of the equipment.

2. Geometric measurement: Measure the size, shape and accuracy of each component of the equipment to ensure that it meets the design requirements.

3. Functional testing: Perform performance testing on the equipment in all directions, including heating, bending, cooling and forming functions.

4. Material analysis: Analyze the material composition, hardness and toughness of key parts of the equipment to ensure that they meet quality requirements.

An automotive glass factory of the applicant signed a "Purchase Contract for Panoramic Sunroof Hot Bending Tempering Line" with an equipment manufacturer of the respondent, agreeing that the self-explosion rate is ≤0.1%. After being put into production, the self-explosion rate exceeded 1.5%. The manufacturer argued that it was caused by impurities in the original glass.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site investigation case materials and other data of "Glass Bending Tempering Equipment" and made the following quality analysis Analytical opinion:

The temperature difference in the heating zone of the glass bending and tempering equipment involved in the case reaches ±12℃ (agreement ≤±5℃), the air grille cooling rate deviation is ±25% (agreement ±10%); the Al₂O₃ content of the roller is only 89% (agreement ≥95%), and the thermal expansion coefficient exceeds the internal stress concentration of Peugeot glass.

The appraisal conclusion concluded that defects in the temperature control system and materials were the main causes of the self-explosion.

The glass bending and tempering equipment quality appraisal report should include:

1, the purpose of the appraisal (such as self-explosion accident attribution, performance verification) and reference standards;

2, the equipment model involved, process parameters, production logs;

3, testing methods and equipment clearance Single (such as surface stress meter, three-dimensional coordinate machine);

4, detection data and failure correlation analysis (such as the impact of temperature difference on self-explosion rate);