Rolling door rolling equipment and its various components are assembled by self-assembly of various parts. The accumulation of the errors of the components of each related machine will be directly reflected in the assembly accuracy of the machine. Therefore, the assembly accuracy of the product is first affected by the machining accuracy of the zero firmware (especially the key parts). The coordination and contact between parts directly affect the production accuracy of the whole machine, especially the stiffness and firmness. Therefore, improving the contact rigidity of the mating surface between parts is also conducive to improving the accuracy of product assembly. The subway is now more and more common, and many subway-related industries have grown up with it. Take the subway track, for example, which is made using the new cold-bending forming technology. It is a technology that cools and bends the steel bars according to the diameter without cracking. Shaft-hub connection refers to the connection between the shaft and the transmission parts on the shaft, such as gears, worm gears, pulleys and couplings. The role of the connection is to transmit force, torque and motion. Commonly used are key connection, spline connection, pin connection, interference fit connection, etc., among which key connection is the main connection method.

The small unit of the components of the commonly used rolling gate pressing machine is called a part. A component is a combination of parts that performs a specific function. Parts are divided into two categories: one is general parts, such as shafts and gears; the other is special parts, such as crankshafts in automobiles and pistons in internal combustion engines.