Double-end toothed stud and manufacturing method thereof

Abstract

The invention discloses a double-end toothed stud. The double-end toothed stud comprises a stud body and threaded sections, the threaded sections comprise the first threaded section and the second threaded section, and the stud body is located between the first threaded section and the second threaded section; an included angle formed between a tooth arranged at the initial end of the first threaded section and the vertical line of the stud body is 20 degrees, an included angle formed between a tooth arranged at the tail end of the first threaded section and the vertical line of the stud body is 20 degrees, an included angle formed between a tooth arranged at the initial end of the second threaded section and the vertical line of the stud body is 20 degrees, and an included angle formed between a tooth arranged at the tail end of the second threaded section and the vertical line of the stud body is 20 degrees; the tooth length of the first threaded section is 180 mm, the tooth pitch between the two ends of the first threaded section is 10 mm, the tooth length of the second threaded section is 140 mm, and the tooth pitch between the two ends of the second threaded section is 10 mm; the stud body is in a cylindrical shape; the total length of the stud body and the threaded sections is 470+ / -0.8 mm. The double-end toothed stud has the advantages of being good in smooth finish, free of burrs and high in constant-temperature impact absorbing energy. The invention further discloses a method for manufacturing the double-end toothed stud.

Description

technical field [0001] The invention relates to the field of fasteners, more specifically it is a double-ended threaded stud. The invention also relates to a method for preparing a double-threaded stud. Background technique [0002] Double-headed studs refer to cylindrical fasteners with threads at both ends, which are widely used in electric power, chemical industry, oil refining, valves, railways, bridges, steel structures, automobile and motorcycle parts, machinery, boiler steel structures, hanging towers, Large-span steel structures and large buildings, etc.; mainly used for large-scale equipment where the main body needs to install accessories, such as sight glass, mechanical seal seat, deceleration frame, etc., and stud bolts are required. One end of the stud bolt is screwed into the main body and installed The other end of the attachment is equipped with a nut. Since the attachment is often disassembled, when bolts are used to directly connect the main body and the a...

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Problems solved by technology

[0003] At present, there is only one factory in Germany that produces similar products and provides similar products to China. According to Chinese customs statistics, the price of imported high-strength fasteners in China is estimated to be six times the price of Chinese exports. The logistics time from Germany to China is about 40-60 days. left and right, which seriously restricts the just-in-time production and assembly of Chinese enterprises; the matching degree of the existing domestic double-ended stud thread section is not high, the concentricity of the thread section and the stud body is poor, and the matching degree of the thread section and the stud body is not high , the smoothness (surface roughness) of the threaded section and the stud body is poor, and the joint between the thread and the thin rod chamfer is prone to burrs. The maximum value of toughness and fatigue strength) can only reach 50-80J. At present, Chinese motor vehicle manufacturers, mining machinery and tunnel boring machine enterprises have a huge demand for double-ended studs with impact absorption energy of 100-120J at room temperature.

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