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[Popular Knowledge] Is it better to tighten the bolts as much as possible?
Release time:
Jul 29,2024
The use of bolts is very wide, from small watch movements to various types of engineering equipment, the smallest screw diameter can be calculated in millimeters, the largest can be calculated in centimeters and decimeters. Bolt we usually call it screws, bolt material is usually divided into steel screws, iron screws, alloy screws, plastic screws, etc., in the use of the bolt is screwed the tighter the better?
When choosing bolts, you can look at the head of the performance level labeling, such as 4.68.8, etc., these numbers indicate the yield strength and tensile strength of the bolt (that is, the larger the value of the bolt in the tightening of the bolt is less likely to fracture, the possibility of slipping wire). When tightening the bolt, the bolt will be in elastic deformation, when the stress value exceeds the yield strength of the bolt material, the bolt will be deformed and can not be restored (refers to the bolt is screwed too tightly, there will be a screw rod longer and can not be restored). And more than the tensile strength of the bolt material, it will begin to appear shrinkage phenomenon, resulting in concentrated deformation, and even fracture. So the bolt is not screwed tighter the better, tightening should be tightened according to its specified torque (if you do not understand the bolt torque friends, there is a strain when you can stop to continue to tighten the steps).
The higher the performance level of the bolt, the better, proving that the yield strength and tensile strength of the bolt will be higher, but at the same time the toughness of the bolt as well as the impact of the bolt will be worse, if the bolt strength is too large, but also may damage the workpiece to be fastened and the equipment, so it should not be purely concerned about the performance level, according to the use of scenarios to choose the appropriate bolt to use.
That is to say, in the use of yielding strong bolts, if the screw is tightened more tightly may pull the parts deformation, for example, used in the scene with the bearings, bolts tightened more tightly may be the bearings directly pressure to deformation, so the use of movable parts to the scene of the bolts can not be screwed too tightly.
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