The Development Of The Digitization Prototyping Of The Full-face Boring Machine In The Rock Breaking And Optimal Design

The traditional product design and development take a long time and cost highly. But the digitization prototype technology is a kind of completely new one, whose emergence and development bring an innovation to the traditional way of product design. The digital design is the process of three-dimensional modeling by computer and makes a variety of simulation analysis and modifies the digital prototype according to the simulation results. In this way, the engineers can find the potential problems and inadequacies of the product in the product design phase, finally we can obtain an optimal program of the design. So the digital design avoids the dependence on the physical prototype in the traditional design, and shortens the product development cycle, reduces R&D costs and makes the enterprise more competitiveness in the market.The full-face boring machine is a complex and highly automated machinery electronic product with design complexity and high cost of production. According to the actual construction experience, the replacement number of the disk-type hob is the main factor affecting the construction progress in the process of tunneling. When designing the knife set of the full-face boring machine, the engineers should make all the disk-type hobs wear evenly and reduce the number of the replacements of the disk-type hob. Therefore, it is very meaningful to optimize the design of knife set of the full-face boring machine. The paper studied the Earth Pressure Balance 6.28 boring machine, established the three-dimensional model of the knife set and the driving part and made the research of the rock breaking mechanism and optimum design of the cutter. Firstly, the author established the three-dimensional model of the knife set and the driving part and made the model import Adams software to achieve a functional simulation and discussed the effect of torque to the angular velocity of the knife set. Secondly, according to the research about the process of rock breaking, we can find the rock breaking track of the disk-type hob and the cross-section of the rock breaking track. And we can get the formula for calculating the volume of broken rock of each disk-type hob, when the boring machine has been rotated a ring. Through domestic and foreign literature, the technical documents which are needed to meet cutter arrange and the foundation of the optimal layout (the smallest difference of the volume of broken rock) are found. Then, the author discussed the effects of the cut depth and broken rock angle to the layout of the knife set. Through the programming software to optimize the design of a knife set, we can get a new arrangement and establish the three-dimensional model of the new knife set. Then calculate the volume of broken rock and variance, and then compare with the Earth Pressure Balance 6.28 boring machine, which can verify the optimized layout of the knife set better than the original layout. Finally, we can calculate forces of the two layouts with the formula which is widely used. Loading the forces of the two models in the Adams software, we can get the forces and the torques in the different direction. Through the comparison of simulation results of the two models, we analyze the forces of the two knife sets.By applying digitization prototyping technology, this paper realized the modeling and simulation of the shield machine. This method is not only suitable for the design and development of shield machine, but it can also be extended to research, design and development of other complicated mechanical system. So the research method and the consequence in this paper have significant practical value.