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The story of screw development

Update:11-09-2019
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The story of screw development           It is no exagg […]

The story of screw development

 

        It is no exaggeration to say that the entire world civilization is fastened by bolts.Comrade lei feng Once said that the would like to make a screw ,and he is very famous.Bolts are so common that even many mechanical people never know the origin of the bolts.

Spirals date back to 400 BC,the bolts we see today are the product of 150 years.Many experts disagree on the origin of bolts,one of the more authoritative claims by Frederick e.Graves in his book bolts and nuts:spiral bolt and nut structures date back only to the 15 th century AD.However,Graves also emphasized that the bolt without spiral can be dated back to ancient Roman times,when the bolt was used as a rotrting joint mechanism of the door.The bolt had a lot in the smooth bolt and a trapezoidal block was inserted to lock it.Graves also suggests that the ancient Romans invented the earliest screws,which were made of bronze or even silver,with hand-polished threads or threads of lead wire wrapped around a sleek screw and welded to it as a thread.The ancient Romans were really creative.

Until 1841 that a man named Joseph Whitworth succeeded in finding a solution.The old man did a lot of sample rearch from bolt factories in Britain.Finally,he suggested standardizing dizing bolts in Britain,so that the bolts of one company and the nuts of another company can be directly us by users after they buy them.He also recommends a thread angle of 55 degrees and specifies how many threads per inch for bolts of different diameters.This is often the case in the world.The Americans came up with the 6s management,but it was not pushed away in America,used by the Japanese first.Bolt standardization is the same,in the UK did not promote at the beginning,the United States first adopted the bolt standardization proposal,and put into action,this is the advantage of late! After bolt standardization took root in the United States,an American named William Seller recommended a 60 degree spiral,and this same American standard  for coarse and fine thread. The American standard has an advantage over the British standard because the American standard for screw teeth is flat at the bottom and top,which makes them easier to manufacture than the British standard set by Whitworth. However, the British are not vegetarian,the British standard in moving equipment,because the bottom of the screw is round,with better fatigue characteristics.

 

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