Quality appraisal of drum vulcanizer

drum vulcanizing machine takes rubber vulcanization reaction as its core principle and realizes the continuous vulcanization of rubber products through heating drums and pressurizing devices. It is widely used in tire manufacturing, conveyor belt production, seal processing and other fields. In the tire industry, it completes the vulcanization and shaping of tread rubber; in conveyor belt production, it ensures the bonding strength between rubber and skeleton materials; in seal manufacturing, it realizes high-precision vulcanization of complex cross-section rubber parts. Compared with flat plate vulcanizers, drum vulcanizers have the characteristics of efficient continuous production, high temperature uniformity, and high degree of automation. They are key equipment in the rubber processing industry.

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

With the development of high-performance rubber products, the number of quality disputes involving drum vulcanizers has gradually increased. The judicial dispute focuses on:

1. Dispute over performance indicators: whether the uniformity of vulcanization temperature meets the standard and whether the pressure stability meets the design value;

2. Material and process defects: insufficient corrosion resistance of the heating drum material and poor mold cavity processing accuracy;

3. Control system failure: temperature PID Unreasonable parameter setting and lack of safety interlocking function lead to overvoltage;

4, contract performance issues: the delivered equipment does not comply with the technical agreement.

drum vulcanizing machine quality appraisal technical methods include:

1. Appearance inspection

Check the outer surface of the equipment to confirm whether it is intact and without obvious defects; check the size, shape, and surface finish of key parts of the equipment

2. Performance test

Temperature control accuracy of measuring equipment;Pressure control accuracy of measuring equipment;Heating and cooling time of measuring equipment

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A rubber products company of the applicant signed a "Drum Vulcanizing Machine Purchase Contract" with a machinery company of the respondent, agreeing to purchase 2 vulcanizing machines of model GL-800 for the production of conveyor belts. After being put into production, the conveyor belt showed partial sulfur deficiency (Shore hardness deviation ≥5HA), and the scrap rate exceeded 15%. The rubber company believed that the equipment had quality defects and demanded compensation for losses. The machinery company argued that the problem was caused by improper setting of process parameters, and both parties went to court.

Identification analysis results:

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

The heating drum material of the drum vulcanizing machine involved in the case is 304 stainless steel (contract requirement 316L), Cr The content is only 18%, and the corrosion resistance is insufficient; the surface roughness Ra of the mold cavity reaches 1.6μm (standard ≤0.8μm), causing the rubber to stick to the mold. The drum speed fluctuates by more than ±5%, and the vulcanization time deviates by more than ±10 seconds; the temperature control system is not calibrated according to the standard, and the thermocouple error reaches ±5°C.

The machinery company failed to provide corrosion-resistant material drums and high-precision molds according to the contract, and the temperature control was not up to standard, which was the main reason for the equipment problems.

drum vulcanizer quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).