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Machining Technology Of High Strength Fastener Thread

Dec 24, 2017

Fasteners include: bolts, studs, screws, nuts, washers, pins. Fasteners, also known as standard parts on the market. It is a kind of mechanical part for fastening connection, which is widely used. The characteristics of fasteners:: Variety of specifications, different performance purposes, and standardization, serialization, the degree of generalization is extremely high. Therefore, some of the existing national (industry) standards of a class of fasteners known as standard fasteners, referred to as standard parts.

The application of thread principle can be traced back to the 220 BC, the Greek scholar Archimedes created spiral water tools. The principle of bolts and nuts began to be applied to wine-making presses on the Mediterranean coast in 4th century A.D. At that time, the external thread is wrapped with a rope to a cylindrical bar, and then engraved with this mark. The internal thread is often used to muffled the external thread with the softer material. 1500 years or so, the Italian Leona Leonardo da Vinci's sketch of the thread processing device, the application of the mother screw and the exchange gear to process different pitch thread of the idea. Since then, the mechanical cutting thread method in the European watch manufacturing industry has developed. In the 1760, British J. Wyatt and the W. Wyatt Brothers were granted a patent for cutting wood screws with specialized devices. In the 1778, J. Ramsden, an Englishman, made a screw-cutting device with a worm-gear pair to produce long threads with high precision. In the 1797, the British Maudsley,h. On his improved lathe, High-strength fasteners Use the mother screw and the exchange gear to turn the metal thread of different pitch, laying the basic method of turning the thread. In the the 1820s, Maudsley manufactured the first taps and dies for thread processing. At the beginning of 20th century, the development of the automobile industry further promoted the standardization of thread and the development of various precision ﹑ high efficient thread processing methods, all kinds of automatic open die and automatic shrinking taps were invented successively, and the thread milling was applied. In the early 30, thread grinding occurred. Although the thread rolling technology has been patented in the early 19th century, it has been developed slowly because of the difficulty of mold manufacturing, until the Second World War (1942~1945), because of the need of arms production and the development of thread grinding technology to solve the problem of precision of mold manufacturing.


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