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Pre-tightening and anti-loosening of threaded connections
1. Pre-tightening of thread connectionBefore the action of the working load, the screw is subjected to the action of the pre-tightening force. 1. The purpose of pre-tightening 1) Increase the stiffness of the connection 2) Increase tightness 3) Improve the ability to keep loose ...Read More -
Fastener selection guide
Fastener function introduction Fasteners are divided into threaded fasteners and non-threaded fasteners, non-threaded fasteners mainly refer to rivets, welded pins, connecting pins, etc., the engine in addition to the use of non-threaded fasteners, the vast majority are threaded fasteners. The s...Read More -
Threaded connection design
4. Pre-tightening and anti-loosening of thread connection 1. Pre-tightening of thread connectionThread connection: loose connection — do not tighten when assembling, only when the external load is applied to the force — tighten when assembling, that is, when carrying, it...Read More -
Thread type and detection
NPT thread is the American standard 60° taper pipe thread. The formula for calculating the warp of the thread is:The formula for the middle diameter of the thread is: D2=d2=D-0.8XPThe formula for thread path is: D1=d1=D-1.6XPThe fit mode of the thread is divided into cone...Read More -
Basic knowledge of common gaskets
Non-metal tape Itscommonly used non-metallic materials are, such as flexible graphite (<600 ° C), polytetrafluoroethylene (-200~260 ° C), fiber reinforced rubber based composite board. Ribbon of Metal StrapsShape: V, W, wavy, etcMaterial: 0.15~0.25 low carbon steel, stainless steel, c...Read More -
Standard Parts and Common Parts
Standard parts and common parts Standard parts:The structure form, size, surface quality and representation method have been standardized. For example, threaded fasteners, keys, pins, rolling bearings and springs, etc. Standard parts are widely used and are produced by professional factories.Com...Read More -
Why do fasteners come loose? Cause analysis of fastener torque attenuation
There are many factors affecting torque attenuation, for different forms of torque attenuation improvement measures are not the same, comprehensive above content, from the process and design point of view to consider the common improvement measures of torque atten...Read More -
Discussion on the principle of expansion bolt
Fixing principle of expansion screw Fixing principle of expansion screw: the fixing of expansion screw is to use the V-shaped inclination to promote expansion to generate friction and binding force, so as to achieve the fixing effect...Read More
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