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With the advancement and development of pipeline technology, the transportation of crude oil and refined oil in our country has been transformed from the transportation of trains and automobiles to the transportation of long-distance oil and gas pipelines. In the process of laying oil pipelines, it is often necessary to simmer the pipe due to hitting dead ends or bypassing obstacles. Therefore, in the field construction, the simmering pipe is mostly cold simmered by a china tube bending machine. In the past, most of our pipe bending machines were imported, but imported cnc pipe bending machines had many disadvantages, such as high cost and untimely supply of spare parts, which severely restricted the company's pipeline construction production capacity. In industrial production, the long U pipe bending machine is an important equipment in the production of air conditioners. It is a numerical control machine integrating straightening, rounding, feeding, cutting, bending and forming functions.

The traditional tube bending machine has a long design cycle, high cost, and inconvenient design modification. The main reason is that the process of analysis, testing, and modification faces a physical prototype; the design method based on virtual prototype technology is a three-dimensional Based on the digital model, combined with the relevant principles of CAE to carry out related performance research on the digital model, the test object is transferred from the physical prototype to the virtual prototype, thus shortening the design cycle and reducing the cost.

   As a new technology in the development and design of pipe bending machines, virtual prototype is a revolution to traditional design methods. Taking the required development of a CNC pipe bender that can bend seven copper tubes at the same time as the research object, a three-dimensional digital model of the pipe bender is established, and the virtual prototype technology is used innovatively to carry out the static and dynamic performance Analyze and apply the results of the analysis to guide the design.

The related aspects of the virtual prototype technology in the design and development process of the TBLU7 CNC pipe bending machine were discussed: including the establishment of the virtual prototype model of the TBLU7 pipe bending machine in UG, and the research and summary of the data between UG and CAE software ANSYS Exchange technology, conducted statics research on the main parts of the tube bending machine, analyzed the dynamic performance of important parts and the whole machine, and verified whether the designed pipe bender meets the technical requirements through the finite element analysis of the pipe bending simulation results .

  In the research process of the automatic pipe bending machine the following work has been mainly completed:

   1. Firstly, it introduces the basic theoretical framework of virtual prototype technology, reviews the research status and development trend of this aspect at home and abroad, and demonstrates the necessity of applying virtual prototype technology to the design of automatic tube bending machine.

   Second, the virtual prototype model of the part was established in UG and assembled, and the interference analysis and evaluation were performed, and the virtual prototype of the whole machine was established.

  3. Based on the established virtual prototype model, it was imported into the finite element analysis software ANSYS in a data exchange format for static analysis and optimization of some parts.

  Four. Based on the established virtual prototype model, conduct modal analysis of the whole machine to improve its dynamic performance.

   5. Combining the theory of pipe bending and forming, the finite element method is used to simulate the bending of the pipe, and the results of the bending simulation are analyzed to verify whether the design meets the technical requirements.

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