Quality appraisal of casting non-destructive testing equipment

casting non-destructive testing equipment takes multi-modal defect identification and digital analysis as its core principles. By integrating X-ray imaging, ultrasonic flaw detection and eddy current testing technology, it can achieve the precise location and quantitative assessment of defects such as pores, shrinkage porosity, and cracks inside castings. It is widely used in high-end manufacturing fields such as automobiles, aerospace, and energy equipment. In the inspection of automobile engine blocks, it is used to identify internal microscopic shrinkage cavities; in the aerospace field, it ensures the non-destructive qualification rate of turbine blade investment castings; in the energy equipment industry, it meets the full-thickness defect screening of nuclear power main pump casings. Compared with traditional testing methods, casting non-destructive testing equipment has the characteristics of high defect detection sensitivity, detection efficiency increased by 5-8 times, and strong data traceability. It is the core equipment for casting process quality control.

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

With the improvement of quality requirements for castings, the number of testing equipment disputes has increased year by year. The judicial dispute focuses on:

1, performance index dispute: whether the defect detection sensitivity meets the standard, detection repeatability error;

2, material defects: insufficient purity of the X-ray tube tungsten target, ultrasonic probe pressure Transistor frequency drift;

3, process problems: positioning accuracy deviation of the mechanical scanning mechanism, and the missed detection rate of the AI defect identification algorithm exceeds the standard;

4, contract performance dispute: key modules are inconsistent with the technical agreement.

The quality appraisal of casting non-destructive testing equipment adopts a variety of technical methods, which vary according to the type of equipment involved and the quality dispute points.

1. Ultrasonic flaw detection: Use the characteristics of ultrasonic wave propagation, reflection and refraction in castings to detect defects within castings.

2. Radiographic flaw detection: X-rays or gamma rays are used to penetrate the casting, and the difference in ray absorption at the defect is used to display the internal defects of the casting.

3. Penetrant flaw detection: Penetrant is penetrated into the surface defects of the casting, and then the developer is used to develop the color to display the surface defects.

An automobile parts factory of the applicant signed an "X-ray Real-time Imaging System Procurement Contract" with an equipment manufacturer of the respondent, and it was agreed that defects of Φ0.4mm or more in the cylinder could be detected. After being put into production, the equipment failed to detect Φ0.6mm shrinkage in the crankcase oil passage, leading to a batch recall. The manufacturer argued that the operator had set wrong parameters.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "casting non-destructive testing equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis conclusions See:

The resolution of the equipment involved in the IQI test was only 4.0LP/mm (contract requirement ≥5.0LP/mm); the X-ray tube current fluctuated >±8% (standard ≤±3%), resulting in a decrease in image signal-to-noise ratio; the AI defect classification module mistakenly identified shrinkage as artifacts, and the missed detection rate reached 12%.

The appraisal conclusion concluded that the core performance of the device did not meet the protocol requirements, and hardware defects and algorithm loopholes jointly led to failure.

Casting non-destructive testing equipment quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

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

4. Identification method