Many defects of square tube are formed in perforation.
Many defects of square tubes are formed in the process of piercing, so the power transfer process in the tube blank is the key process of consuming square tubes. The main difficulty of high alloy piercing is the low piercing performance. In order to ensure the quality, it is necessary to rationally select the deformation parameters of piercing. A small amount of tightening will cause instability in the perforation process, so the critical tightening amount per hour head should be set at about 7% of the previous tightening amount, or it will be impossible to bite, so as to move to increase or block the front. The increase of the shrinkage in front of the head will also form the hole cavity and the defects in the sinking sound. Therefore, if you want to solve the customer service problem, the billet should be centered, and the depth of centering should be compared with other steel grades. Therefore, the heating system is the outlet temperature and the request for heating quality. The quality of heating depends on the heating operation and heating system to a large extent. Compared with a small value, the ellipticity coefficient can improve the quality of the capillary and limit the transverse deformation. However, the ellipticity coefficient is too small, which will cause the rolling piece to rotate difficultly, which will lead to the wear of the guide plate, and it is easy to form defects on the external surface. Therefore, the guide plate should be generally checked for wear when the ship bars the square tube. Once found, it should be replaced immediately. The degree of ellipse should be controlled within the range of 1.07-1.08. It also affects the normal stop of the next process and the key process of heating square tube billets, which has a great impact on the quality of waste products.
Rectangular Pipe It is the main product of cold formed section steel.
Due to cold bending Torque tube There are many kinds and fine specifications. When square and rectangular tubes are consumed on the general gantry type units, many kinds of forming die rolls are required. From 100mm × 100mm to 400mm × In the 400mm forming section, according to the national standard GB6723, there are 44 kinds of square tubes in ten categories and 68 kinds of rectangular tubes in seventeen categories. To complete these specifications, dozens of sets of mold rollers are required in the traditional way. This is not only a great burden for consumer enterprises, but also a great waste of money.
Due to the commonness of square and rectangular tube forming in unit equipment and cold bending process, the combination of die rollers is an inevitable choice for standardized consumption and serialized profiles. In recent years, the combination die roll of domestic units has developed rapidly, and many technological innovations have also been presented, which has greatly reduced the cost of die roll investment and improved the unit efficiency. However, it is basically a partial improvement of the original mold roll, with some gaskets added. The combination mode is lack of science, the structure is much the same, and the roll change time is long.
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