The shape design of tungsten alloy rods is not a mere construction of geometric forms, but a systematic optimization closely centered on the installation constraints, load distribution and assembly precision requirements in engineering applications. According to the difference in shape design, there is a classification of tungsten alloy rods into four categories: straight rods, variable-diameter rods, threaded rods and special-shaped rods.
Straight tungsten alloy rods: Representing the most basic and widely used structural form, they are characterized by a constant axial diameter throughout, with a cross-section usually circular (square or polygonal under specific requirements). They are divided into rough billet straight rods and refined straight rods according to the level of surface finishing. Their prominent advantages lie in economy and flexibility, and they can be adapted to scenarios through simple secondary operations such as cutting or drilling. They are widely used in various fields: serving as electrodes in welding processes, where the constant diameter ensures uniform electric arc; and as balance components in counterweight systems, where the regular shape facilitates array arrangement.
Variable-diameter tungsten alloy rods: Featuring stepped diameter changes along the axial direction, they construct a layered layout of "large-diameter bearing - transition buffer - small-diameter fitting". Their core value lies in the zonal optimization of mechanical responses: the large-diameter section resists bending and torsion, the small-diameter section achieves precise positioning, and the transition section disperses concentrated loads. Typical scenarios focus on stepped assembly requirements: serving as multi-stage shafts in precision transmission systems, where different diameter sections correspond to variable-speed bearings; and acting as multi-station positioning columns in composite molds, where the stepped layout enables process progression.
Threaded tungsten alloy rods: Identified by spiral threads on the surface, the thread specifications cover metric, imperial and pipe thread systems, with distribution forms including full-length threads and partial threads. Their application is positioned in firm connection structures: serving as positioning pins in mechanical molds, where thread locking prevents loosening; acting as fixing rods in aerospace counterweights, where the spiral structure facilitates fine adjustment, disassembly and replacement; and serving as adjusting lead screws in medical imaging equipment, where precision threads ensure accurate displacement.
Special-shaped tungsten alloy rods: Customized products for specific working conditions, their shape diversity includes cross-sectional variations (rectangular, polygonal, trapezoidal, etc.), surface features (grooves, bosses, keyways, etc.) and composite superimposed types. Their applications are concentrated in high-end specialized fields: serving as multi-interface connecting rods in spacecraft, where the special shape realizes linkage coordination; acting as toothed control rods in nuclear reactors to regulate the travel; and serving as grooved transmission rods in micro-precision instruments, where the grooves guide power transmission.
