Comparison test block for ultrasonic flaw detection of conical surface of air valve of medium-speed diesel engine and manufacturing method of comparison test block

By designing a comparison test block adapted to ultrasonic flaw detection of the valve cone surface of a medium-speed diesel engine, the problem that existing test blocks cannot match the valve cone surface angle was solved, achieving efficient and accurate detection results and reducing detection costs.

CN121633290APending Publication Date: 2026-03-10CHENGDU HAIRUI PROD QUALITY TECH TESTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-23
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

The existing standard test block cannot effectively match the specific angle of the valve cone surface of a medium-speed diesel engine, resulting in large deviations in sound field calibration, poor repeatability of test results, and inability to simulate the structure of the valve weld overlay, posing a risk of missing micro-cracks and low testing efficiency.

Method used

A comparative test block for ultrasonic flaw detection of the conical surface of a medium-speed diesel engine valve is designed, comprising a valve disc section, a conical surface section, and a valve stem section. Through precision machining and simulation of real defects, including fatigue cracks, defect porosity, and defect grooves, it adapts to various conical surface angles and simulates the structure of the valve weld overlay, thereby improving the accuracy and efficiency of detection.

Benefits of technology

It improves the accuracy of crack identification, ensures the stability and repeatability of detection results, reduces detection costs, and improves detection efficiency.

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Abstract

The comparison test block comprises a valve disc section, a conical surface section and a valve rod section, the large head end of the conical surface section is detachably connected with the valve disc section, and the small head end of the conical surface section is detachably connected with the valve rod section. A plurality of fatigue cracks are uniformly formed in the positions, close to the valve disc section and the valve rod section, of the conical surface section in the circumferential direction, a plurality of defect air holes with different diameters are uniformly formed in the middle of the conical surface section in the axial direction at intervals, and defect grooves which are not subjected to surfacing welding are machined in the surface of the conical surface section. The comparison test block is manufactured through a stepped simulation air valve structure and comprises an air valve conical surface section, a valve disc section and a valve rod section, the problem that a general test block can only simulate a single part is effectively solved, different artificial defects are machined at the same time, a surfacing layer is machined on the conical surface section, real air valve defects are simulated, and the detection efficiency and the detection accuracy are effectively improved.
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