Compared with the traditional drawing and cutting methods, the rotary forging of tantalum-niobium rod has better surface finish, higher material utilization and efficiency. The main stress state in the deformation area is three-way compressive stress, and the main deformation state is three-way compression and extension, which is beneficial to improve the plasticity of the forging billet. Due to the equipment with the method of manual feeding, so can't ensure uniform into the bar, causing the volatile sizes of finished product, in the aspect of precision control of the size of the finished product is very poor, through appropriate to adjust the equipment the thickness of the gasket, adopt the way of rotary swaging multichannel time after mini tab statistics found the finished tube rod rotary swaging diameter tolerance can control the scope of the standard deviation, Its length tolerance can be controlled up to + 6.35mm.
The diameter tolerance of the finished niobium zirconium rod after forging can be controlled within the range of ± 0.10mm. The outer diameter of the f20 mm niobium zirconium rod after forging is shown in Figure 1 for the first time and Figure 2 for the second time. After forging, the standard deviation of the outer diameter of the finished product is small, the upper and lower limits of the fluctuation of the outer diameter value are narrow, and the diameter ellipticity is good. Its length tolerance can be controlled in ± 6.35mm, to meet the supply requirements.
Because of the mould is different size, different slides up and down in the rocker to guide groove position, roll and pipe in the best position to point B contact point, the contact points of the roller and the tube, roll to pipe a force, bring forward, backward conversely ingredients, through debugging of tripod principle make the wall thickness tolerance of tantalum can control in the plus or minus 10% the following, In the process of processing, the wall thickness is often increased and decreased along a plane and a line. Through local repair of the finished pipe, the abnormality can be eliminated.
The feed speed of the rotary forging machine and the number of repeated forging of the finished product determine the dimensional accuracy of the finished product. The slower the feed speed, the more forging times, the smaller the diameter ellipticity and standard deviation, and vice versa. The tolerance of the wall thickness of the general pipe can be controlled within ±10%, and the tolerance of the high-precision pipe can be controlled within ±7%. The Gage-R analysis of the diameter of niobium zirconium wire shows that the measuring system is acceptable. The variation of the measuring system data is mainly caused by the deviation between components, and has nothing to do with the operators, surveyors and measuring tools.
