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The GB elbow is an elbow fitting with a hollow section and no seams around it. The GB elbow has a hollow section and is used as a conduit for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the GB elbow is lighter in weight when it has the same bending and torsional strength. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmission shafts. , bicycle racks and steel scaffolding used in construction. The use of steel pipes to manufacture ring-shaped parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and have been widely used in steel pipes. Since the area of ​​the circle is the largest under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, the circular section is subjected to a relatively uniform force when subjected to internal or external radial pressure, and therefore, most of the steel pipes are round pipes. The output flow of the butt welded seamless elbow is suitable for all walks of life, and it is convenient to connect with other steel pipes.
The national standard elbow adopts a method of NUM system to transform the ZSTZ25 gear grinding machine. At the same time, it introduces the characteristics of the transformation and the effect after the transformation, and expounds the feasibility and technical points of the numerical control transformation of the gear grinding machine. The gear grinding machine is a complex precision machine tool. In China, large gear grinding machines have always relied on imports. Most of these gear grinding machines use tapered grinding wheels and grind them according to the principle of development. It was not until the late 1990s that shaped gear grinding machines entered China. Due to the limitations of technical conditions at that time, the electrical gear system and hydraulic system of the gear grinding machine that entered China before the 1990s had many factors, which seriously affected the normal use. Many manufacturers have put forward the requirements for the transformation of such machine tools.
The production and improvement of the national standard elbow is an arduous task, ensuring the perfection and demand of functions, and using and promoting it in the right way and method, and fully playing its role in the industry. 
Update of national standard elbow production technology