On-line cutting device and method

The invention relates to an online cutting device and method, and the device comprises a first cutting tool assembly, a second cutting tool assembly, a filter screen assembly, a pipe synchronizing assembly and a motor moving assembly, and also comprises a machine tool main body and a buffer auxiliary assembly. The cutting method comprises the following steps that firstly, the cutting device is initialized, and it is ensured that all assemblies are located at initial set positions; secondly, a cutting assembly and a pipe synchronizing assembly complete the pipe cutting action; and thirdly, the cutting assembly and the auxiliary assembly are reset. The two cutting tool assemblies of different structures are used for cutting thick-wall pipes at the same time, production and cutting integration of the pipes is achieved for the first time with the help of the pipe synchronizing assembly, a large amount of production time can be saved in the production and machining process of the thick-wall pipes, and the automati