Airbag vulcanizer quality appraisal

air bag vulcanizing machine is the core equipment of tire manufacturing. Through the rubber vulcanization reaction under high temperature and high pressure environment, the tire carcass and rubber layer are closely combined. The airbag vulcanizer can complete the vulcanization and shaping of the tread and sidewall of passenger car tires; handle the complex structural vulcanization of commercial vehicle tires; and high-precision vulcanization of special tires such as aviation and engineering.

Compared with traditional flat plate vulcanizing machines, airbag vulcanizing machines occupy a dominant position in the tire industry due to their three-dimensional curved surface forming capabilities, high vulcanization uniformity, and low energy consumption. Its technical level directly affects the dimensional accuracy, mechanical properties and production efficiency of tires, and is an important manifestation of the core competitiveness of tire companies.

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

As tire production capacity expands, quality disputes over air bag vulcanizers occur frequently. The judicial dispute focuses on:

1, whether the equipment meets the vulcanization temperature uniformity (±2℃), pressure stability (±0.1MPa) and other indicators agreed in the contract;

2, whether there are air bags due to mold wear Defects such as tire bulges and lack of rubber caused by leakage;

3. Whether the control system is stable and reliable, and whether it can monitor vulcanization time, temperature and other parameters in real time;

4. The correlation between quality problems and tire recalls and production line shutdowns.

Air bag vulcanizing machine quality appraisal technical methods include:

1, appearance and structural inspection

Check whether the mold material (such as ductile iron, alloy steel) meets the high temperature resistance and wear resistance requirements, and whether there are cracks or deformations on the surface. Check the sealing of the airbag and test its burst pressure (≥1.5 times the design value) and fatigue life (≥50,000 cycles).

2, thermodynamic performance test

uses an infrared thermal imager to scan the mold surface temperature field to verify the uniformity (±2°C under no-load/full-load conditions). Monitor the pressure curve of the vulcanization process and evaluate the response time (≤0.5 seconds) and stability of the hydraulic system.

0 simulates abnormal working conditions such as temperature overshoot and pressure drop, and tests the response time of automatic shutdown and alarm function (≤2 seconds). Check the human-machine interface parameter setting permission management to prevent unauthorized modification of vulcanization parameters.

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26, durability evaluation

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4Conduct continuous vulcanization fatigue test (such as 1000 cycles) to record the mold wear rate and air bag aging degree. Simulate acidic/alkaline environment to test the chemical corrosion resistance of the mold.

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A tire factory of the applicant signed a "Fully Automatic Air Bag Vulcanizing Machine Purchase Contract" with an equipment company of the respondent, agreeing to purchase 10 units of QL-2000 equipment. After the equipment was put into production, the tires produced had problems such as uneven vulcanization and sidewall bulges, resulting in a 15% drop in the finished product qualification rate. The tire factory believed that the equipment had a design defect and demanded compensation for losses. The equipment company argued that the problem was caused by improper rubber formulation or operation, and both parties took the case to court. The court entrusted a third-party appraisal agency to conduct quality appraisal of the equipment involved in the case.

identification analysis results:

The quality analysis expert group discussed and synthesized the relevant information of the "air bag vulcanizing machine", the contract technical agreement, on-site investigation case materials and other data Technical analysis, the following quality analysis opinions were made:

The mold material of the airbag vulcanizer involved in the case was downgraded, and the airbag rubber strength was insufficient; the temperature uniformity was poor, and the pressure control system responded slowly; the mold processing accuracy did not meet the design requirements, and the parting surface seal failed.

The equipment company failed to provide equipment that met the material and precision requirements as stipulated in the contract, which was the fundamental reason why the quality of the products produced after production was not up to standard.

Air bag vulcanizing machine quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. The name, model, manufacturer and other information of the device being identified.

3. Identification methods and steps.

4. Identification results and analysis.