Quality appraisal of upset forging machine

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upsetting forming machine takes multi-directional precision plastic forming as its core principle. Through optimized mold design, hydraulic system synchronous control and temperature-pressure coupling process, it can achieve efficient near-net forming of complex special-shaped parts. It is widely used in automotive fasteners, bearing rings, aerospace forgings and other fields. In automobile manufacturing, it is used for cold heading forming of engine connecting rods and wheel hub bolts; in the bearing industry, it meets the integrated forging needs of high-precision ferrules; in the aerospace field, it is used for isothermal die forging of titanium alloy high-temperature forgings. Compared with traditional forging equipment, upsetting forming machines have the characteristics of high forming accuracy, high material utilization, and long mold life. They are the core equipment for precision manufacturing in the high-end equipment manufacturing industry.

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

With the upgrade of precision forging technology, upsetting and forming machine quality dispute cases have become more professional. The judicial dispute focuses on: 1. Performance index dispute: whether the actual forming accuracy reaches the standard (coaxiality ≤ 0.1mm), and whether the maximum mold closing pressure meets the technical agreement;

2. Material defects: carbide segregation of the mold steel Cr12MoV exceeds the standard, and the hydraulic cylinder forging streamline fracture;

3. Process problem: The phase difference of the multi-directional synchronous control system is >5ms, resulting in forging folding and heating furnace temperature control accuracy ±15°C exceeding the standard;

4. Contract performance dispute: The functional configuration of the delivered equipment (such as servo motor power, PLC control module version) is inconsistent with the technical agreement.

Such cases need to pass forming accuracy testing, material metallographic analysis and system dynamic response verification to clarify the quality responsibility.

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1. On-site inspection

Check the machine appearance, nameplate and related logos. Observe machine operating status, noise and vibration.

2. Test

Perform performance tests according to standard methods, including: upsetting force, machining accuracy, work efficiency

3. Material analysis

0 Conduct material analysis on key components of the machine, including: hardness, toughness, wear resistance

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24. Fault diagnosis

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4Analyze the causes of machine failure, including: design defects, manufacturing defects, improper maintenance

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The applicant, an auto parts company, signed a "Multi-station Cold Heading Machine Purchase Contract" with a forging equipment factory, the respondent, to purchase two TD-800 equipment for the production of wheel hub bolts. During the debugging phase, 30% of the product's thread leads were out of tolerance, resulting in customer claims. The parts company accused the equipment of insufficient accuracy, and the equipment factory argued that the operator failed to preheat the mold.

Identification analysis results:

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

The equipment involved in the case had a verticality deviation of 0.12mm/m in the third station slider (contract requirement ≤ 0.05mm/m), resulting in poor bolt coaxiality; the mold hardness was only HRC58 (standard HRC62-64), and the surface nitride layer thickness was 3μm (required ≥8μm); there was a logic error in the PLC program, and the ejection timing of the three stations was delayed by 8ms.

The appraisal conclusion concluded that the equipment factory failed to control the mechanical accuracy and mold heat treatment process in accordance with the agreement, and system control defects were the root cause of the quality problem.

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Upsetting forming machine quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standards, power of attorney, etc.)

4. Identification method

05. Identification results (including appearance inspection, performance testing, disassembly inspection, material analysis, etc.)

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26. Identification conclusion

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