Thread Rolling

To improve the service life of the threads, the bottom of the threads is rolled using rolling wheels with a surface profile similar to the threads. This deforms and strengthens the bottom of the threads, improving their overall fatigue resistance.In view of different specifications of API threads and other special threads with unique structural parameters, such as tooth shape, taper, and pitch, the company researched and formulated a technological program with different rolling parameters. The company also designed a rolling device that successfully solved the thread rolling problem and controlled the amount of plastic deformation of the bottom arc within the drawing requirements. The surface roughness of the bottom arc after rolling reached Ra 0.1 μm, meeting the requirements of various special material threads.