Predicting and Verifying Forces by Using Different Cutters and Spaces
It is notoriously known there are lots of factors influence cutter efficiency and tool life for boring operations. The key problem is how much each influenced and where is the best balance point. This paper uses the orthogonal test method to simulate and
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Abstract It is notoriously known there are lots of factors influence cutter efficiency and tool life for boring operations. The key problem is how much each influenced and where is the best balance point. This paper uses the orthogonal test method to simulate and verify the influence by the two most important cutting parameters, like cutting speed, cutting penetration (which is the same as cutting depth as in the mechanical machine). First, we used the optimized model and designed a new test mechanism. In the simulation part, we use Rock Failure Process Analysis simulates the rock fragments and the changes of stress field. With these new numerical algorithms, we can simulate the mass and cutting forces in the boring, and we finally find each balance point in the real boring in different cutting parameters. And we also updated a new liner cutting test experimental mechanism, which can simulate the real boring operations in the lab when we set different cutting parameters. We use the simulation and test method to verify our predicting result. We show that the best disc cutter shape is 10 mm flat cutter ring and the best cutting space in our project is 76 mm for 17 inch cutter ring in our cutting test. However, since we understand the complex of different factors we can bound the balance point to those values in certain boring condition. Keywords Predicting model
Cutting parameters Cutter forces Tool lifetime
Z. Wang (&) W. S. Wang School of Mechanical and Automation, Northeastern University, Shenyang, Liaoning, China e-mail: [email protected] J. Wang C. Liu State Key Lab of Tunnel Boring Machine, Northern Heavy Industries Group Co. Ltd, Shenyang, Liaoning, China e-mail: [email protected]
Z. Wen and T. Li (eds.), Practical Applications of Intelligent Systems, Advances in Intelligent Systems and Computing 279, DOI: 10.1007/978-3-642-54927-4_17, Springer-Verlag Berlin Heidelberg 2014
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1 Introduction As we all know, the motion of disc cutter is a composite motion in the real boring [1–3]. One is the straight penetration together with the cutter head in the boring axis, the second movement is the revolution motion around the main bearing, which is named cutting speed in this paper, the last but not the least one is the cutter ring self-rotation caused by the friction force between the cutter ring and the rock. This paper studied the boring effect and efficiency under different cutting factors especially on cutting speeds, penetration. We are trying to find the best penetration and cutting speed in our project. The result will greatly help in the tunnel boring operations and help the operators to decide how much penetration and cutting speed in the project. And from this we can calculate the thrust of the hydraulic cylinder and the cutter head speed. This will greatly reduce the project time and improve the boring efficiency.
2 Model Theories Cutting forces is one of the impotent physics parameters in cutting process. In the real boring, there are two main forces on disc cutters, o
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