The pre-tightening torque usually overcomes the thread friction and prevents loosening. When the fasteners are tightly attached together, the relationship of the torque-rotation angle due to the unevenness of the bearing surface is non-linear. At the same time, other factors affecting this include fastener coating and plating, surface roughness and thread deformation. Enter the linear elastic clamping area. This part of the signal is most meaningful in the study. Because most of the tightening force is transmitted from the tightening tool to the assembly part through this stage. The linear portion of the curve gives an accurate estimate of the axial force of the fastener. Here, the intersection of the linear tangent and the X-axis is called the elastic starting point. The axial force of the fastener and the angle of rotation of the fastener are linear from the elastic starting point to the tightening stop point of the clamping region, so that it is allowed to pass the control of the rotation angle without the direct measurement, and it is accurately estimated that the tightening assembly is reached. Clamping force. The region of the over-elastic range region, that is, from the end of the elastic range into the yielding region. These curves are obtained by testing, and the yield point of the fastener can be analyzed from the shape of the curve, and the judgment of the yield is sometimes more affected by the fastener connecting parts. Pads, relatively soft or elastic clamping parts, or the yield of threads, all of which affect the overall yield state. By independently analyzing and testing each area of ​​the torque-angle test signal, fastener suppliers can not only obtain the correlation between torque, axial force, angle and bolt friction performance test report, but also provide them with them. The customer ensures that the host manufacturer's bolted connection is safe and reliable. At present, there are about 30 bolt manufacturers in the automotive industry in China, and most of them have not realized that the discreteness of bolt friction performance is crucial to the customer's assembly process. With the continuous development of the technical level of China's fastener industry, more and more bolt manufacturers (such as Jinyi, Yingxi and some other Taiwanese companies in the mainland) have fully realized this problem and established their own tight Firmware friction performance test platform. Research on the connection of threaded fasteners has also been a history of contempt in the world. Due to the low level of domestic component manufacturing, a large safety factor results in low material utilization, awkward construction and poor reliability. Double Handles Kitchen Mixer Faucet Kitchen Sink Taps is an economic Kitchen Faucet, Double Handles operate and cold valve core design. Outlet pipe can be 360 ° rotation, bubbler outlet water more lively and comfortable. Kitchen sink mixer is suitable for all kinds of kitchen sinks, single hole deck mounted installation.And the use of high-quality spool, you can also customize your favorite color Double Handles Sink en Mixer Faucet,Double Handles Sink Kitchen Mixer,Double Handles Sink Kitchen Faucet,Double Handles Sink Kitchen Mixer Taps WENZHOU CHENKAI SANITARY WARE CO.,LTD , https://www.cnchenkai.com