Galvanized belt tube, also known as a pre -galvanized pipe, looks bright with the naked eye, the surface is smooth and beautiful, and strictly speaking, it is also a type of hot -dip galvanized pipe, but the processing process is different. Galvanized band pipes generally first gong the naked narrowband through the continuous hot -zinc -soaking equipment, and process it into a galvanized belt, and then the galvanized belt is welded into a galvanized pipe.
Galvanized band square tube expansion is a working pressure production process using hydraulic or mechanical equipment to use the inner cavity of the galvanized band square tube to make the galvanized square tube expanding the swelling and forming along the axial direction. Machinery and equipment methods are simpler and efficient than hydraulic press methods. The machinery and equipment are more efficient. In several large -caliber galvanized galvanized cubes in the world, the expansion process process is selected. The processing process is:
The expansion of the mechanical and equipment is expanded by the fan -shaped block of the partial part of the diameter of the diameter. Divide into five links:
1. Basic entire circuit link. The fan -type block is turned on until all the fan type touches the inner cavity of the galvanized band square tube. The whole circle.
2. The name of the nominal name. Fan -type blocks have just begun to reduce the rate of fitness exercise until they reach the prescribed site. This part is the upper part of the finished product management regulations.
3. Revisive compensation link. The part of the fan type in the 2nd link will begin to further have a low rate until it reaches the prescribed site. This part is the upper part of the inner circle of the inner circle of the galvanized zinc band square tube specified by the process technology.
4. CICC and stable links. The fan -type block has not moved for a period of time on the upper part of the inner circle of the galvanized square tube in the bouncing. It is a solid and stable link specified in the machine equipment and diameter processing process.
5. Possented the return link. The upper part of the inner circle of the galvan galvanized band square tube of the fan type has just begun to shrink quickly until it reaches the original expansion diameter. It is a fan -shaped block specified in the diameter processing process less.
