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Vibratory Design of Gantry Machine

Alishzadeh Khoei, Amir | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58225 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedi, Mohammad Reza; Akbari, Javad
  7. Abstract:
  8. Machine tools are highly value-added devices. Thus, design and fabrication of these tools is essential for industrial development. Nowadays, it is preferable to manufacture products with minimum machine set-ups. So, these tools should be capable of achieving both high accuracy and fine surface finish. Manufacturing industries demands for giant components with complex yet accurate features such as sheet metal forming dies. Gantry machines are the obvious choice for manufacturing these components because of their high maneuverability. Meanwhile, their large structure has relatively low stiffness and a tendency to vibrate. Thus far, they have operated in low rotation speed and cutting depth, to prevent resonance and chatter. However, to achieve high accuracy and fine surface finish, higher machining speed is required. On the other hand, to reduce manufacture time, machine tools need to increase cutting depth to enhance rate of material removal. To sum up, an optimum design for gantry machine structure is pivotal. The objective of this research is to develop a method for modeling gantry structure, which could be utilized in optimization of its design. An important factor in modeling gantry machine structure during milling is variation in amplitude and direction of the cutting forces. These forces vary based on the number and quality of teeth engagement. This phenomenon can cause forced or self-excited vibration. Machine tool design process requires a fast and flexible method for extraction of vibration properties of the system. In this research, Receptance coupling method is proposed for modeling any specific gantry machine tool structure. Finite element analysis provides the Receptance coupling method with deformation frequency response functions
  9. Keywords:
  10. Gantry Milling Machine ; Receptance Coupling ; Finite Element Method ; Machine Tool Vibrations ; Machine Tools

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