Tungsten crucible internal defect detection method

A detection method and internal defect technology, applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., can solve problems such as tungsten crucible detection methods that have not been seen, achieve intuitive detection results, fast detection speed, and avoid missed detection.

Active Publication Date: 2013-01-16
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Tungsten crucible internal defect detection method
  • Tungsten crucible internal defect detection method
  • Tungsten crucible internal defect detection method

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[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] The first group of embodiments uses phased array ultrasonic testing equipment to divide the tungsten crucible into three parts for ultrasonic testing. figure 1 ), the double-crystal phase-controlled detection method is used for the tungsten crucible wall, and the phased-array ultrasonic detection is carried out with a dual-crystal probe; the phased-array ultrasonic detection is carried out with a phased Sensitivity test blocks used for detection of crucible wall and tungsten crucible bottom (see image 3 ) are tungsten plates whose length, width and height are 60-100mm, 30-50mm, and 30-50mm respectively. Three flat-bottomed holes with different diameters and the same depth are drilled inside by electric spark drilling, and the interval between the holes is greater than 5mm. , the pore diameters are 0.2-0.45 mm, 0.5-0.7 mm, 0.8-1.0 mm, and the pore depths of diffe...

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Abstract

The invention relates to the technical field of ultrasonic flaw detection and particularly to a tungsten crucible internal defect detection method. A phased array ultrasonic detection device is used, a specially-made sensitivity test block with high sensitivity serves as a reference test block, according to structural features of a tungsten crucible product, a tungsten crucible is divided into three parts, optimum phased array configuration is elected for ultrasonic detection, the method can be used in detection of tungsten crucible internal defects within the diameter of 600mm, the height of 700mm and the thickness of 30mm, a tungsten crucible internal defect with the smallest equivalent hole of 0.2mm can be detected, the defect detection can not be missed, one tungsten crucible is detected for about 10 minutes, and the method is simple in operation, high-efficiency, direct in detection result, low in cost and capable of meeting the requirement of large-scale production.

Description

technical field [0001] The invention relates to the technical field of ultrasonic flaw detection, in particular to a method for detecting internal defects of a tungsten crucible. Background technique [0002] Tungsten crucible is used in metal smelting industry. As a heating element, the internal quality of tungsten crucible has a great influence on the quality and output of smelted metal. [0003] Tungsten crucible is mainly molded directly with tungsten powder, which is difficult to form and requires a lot of pressure. Therefore, during the production process, the internal stress is relatively large, and the product is prone to cracks. There is an arc-shaped deformation part at the connection between the bottom of the tungsten crucible and the wall. This part is the part of stress concentration, and cracks are often found in this part. Tungsten crucibles generally use water to provide the pressure required for isostatic pressing. When the quality of the mold is not good,...

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Application Information

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IPC IPC(8): G01N29/04
Inventor 卢少武沈峥谢艳成
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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