Tube sheet bitIt is an important large-scale heat exchange equipment in the nuclear power system. It is a hub connecting the primary circuit and the secondary circuit. It is also a shield for the primary circuit and the secondary circuit. It has the function of preventing radioactive fluid from entering the secondary circuit and making ordinary island equipment not radioactive. Then, let's learn about the lower tube plate drill bit together!

The tube sheet drill bit is an important part of the steam generator, which is provided with two inclined tubes. For example, hydrophobic tubes for drainage and secondary side drainage. Hydrophobic pipes require open-hole machining, with the holes running through the pipe and extending to the secondary side surface of the pipe. The drain hole is a kind of oblique hole, the angle needs to be strictly controlled during extension, and the tolerance requirements for the drain hole, the tube hole bridge and the straight edge section on the secondary side of the tube plate are required.

In the past, the waterproof hole processing is generally a method in which the tube plate and the waterproof pipe are integrally formed at a specified angle, or a method in which the tube plate and the waterproof pipe are separately opened for welding. The above method has the problems of complex manufacturing technology, high cost and low efficiency in the early stage of integral forming of tube plate and tube. Although welding is carried out after opening holes respectively, due to welding deformation, the coaxiality of the opening in the tube plate and the opening in the tube is difficult to control, and the error accumulation is large, the precision is low, and the product quality is difficult to achieve. In addition, the previous methods are not reversible. Once offset occurs, it will have an irreparable impact on the transition between the tube plate and the drain pipe, and in severe cases, it will lead to abandonment.

Therefore, the urgent problem to be solved at present is to provide an effective, low-cost, high-precision and reversible method for perforating inclined tubes on a tube sheet.

Tube sheet bit technology to achieve the elements:

　　Tube sheet bitIn order to overcome this problem, weld the tube and tube plate at a specified angle before perforation, find the cavity and virtual hole, obtain the actual angle of the tube and tube plate after welding deformation, and fuse the data obtained from the virtual hole with the three-dimensional structure diagram of the actual size of the workpiece, so as to determine the position of the hole to provide the basis for the adjustment of processing parameters in the future, realize the reversibility of inclined tube perforation processing, and improve the processing accuracy and efficiency, thus, the present invention is achieved.

The beneficial effects are as follows.

1) Provide the inclined tube perforation processing method on the tube sheet, simple operation, easy control of conditions, low cost, and wide application range;

2) The inclined tube perforation processing method of the tube plate adjusts the coaxiality of the perforation by welding the solid tube and the tube plate into a whole, so as to avoid the occurrence of errors and reduce the difficulty of operation;

3) The provided method for perforating the inclined tube on the tube plate determines the angle with the tube plate through virtual perforation, thereby improving the processing accuracy.

4) Provide a three-dimensional structure by fusing virtual processing data and the actual size of the workpiece, can foresee the results of drilling processing, according to the results of the adjustment of post-processing parameters, to achieve reversible processing, effectively improve processing efficiency, reduce the loss of the tube plate on the tube plate drill processing method.

The above introduction isTube sheet bitProcessing process, if you need to know more, please feel free to contact us!