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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Non-contact inspection of internal threads of machined parts
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Non-contact inspection of internal threads of machined parts

机译：对加工零件的内螺纹进行非接触式检查

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During the manufacturing process of mass-produced automotive parts, millions of internal threads are produced annually by each automaker. The manufacturers invest a lot of effort and resources to improve the quality of the threads by inspecting their features, mainly by using manual contact gages. The majority of manufactured threads are used in threaded joints that assemble two mechanical parts. However, there are threads that have additional functionality, for example, an automotive spark plug. Recently, automotive designers have found that the angular direction of the spark plug inside the combustion chamber affects the efficiency of the engine. Hence, the manufacturers are interested in measuring the exact position of the thread starting point, allowing them to position the plug in the right direction during the plug assembly process. Our technique allows precise measurement of the thread starting point and meets this requirement. In order to improve the quality of internal threads, it is essential to measure the threads dimensional features. It is also important to inspect its internal surface for defects such as the existence of burrs, thread discontinuities, or internal porosity defects. The paper introduces two novel non-contact electro-optical techniques for inspecting small-size internal threads. The first one enables in-process internal thread geometrical measurements using a high-precision laser sensor which utilizes a motorized periscope. The second technique is based on image processing and uses innovative machine vision; a line-scan technique which uses a CCD camera with a “sight pipe” panoramic optical device. The two methods are complementary; together they allow the practical inspection of all needed features of the internal thread. The methods were tested successfully.
机译：在批量生产汽车零件的制造过程中，每个汽车制造商每年都生产数百万个内螺纹。制造商投入大量精力和资源来通过检查其功能（主要是使用手动接触规）来改善螺纹的质量。大多数制造的螺纹用于组装两个机械零件的螺纹接头。但是，有些线程具有其他功能，例如汽车火花塞。最近，汽车设计师发现燃烧室内的火花塞的角度方向会影响发动机的效率。因此，制造商对测量螺纹起点的精确位置感兴趣，以便他们在塞子装配过程中将塞子以正确的方向定位。我们的技术可以精确测量螺纹起点并满足这一要求。为了提高内螺纹的质量，必须测量螺纹的尺寸特征。检查其内表面是否存在毛刺，螺纹不连续或内部孔隙缺陷等缺陷也很重要。本文介绍了两种新颖的非接触式电光技术，用于检查小尺寸内螺纹。第一个可以使用使用电动潜望镜的高精度激光传感器进行加工中内螺纹的几何测量。第二种技术基于图像处理并使用创新的机器视觉。一种线扫描技术，该技术使用带有“观察管”全景光学设备的CCD摄像机。两种方法是相辅相成的。它们一起可以对内螺纹的所有所需功能进行实际检查。该方法已成功测试。

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