| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 102 === Five-axis CNC machining technologies with more two rolling axes than traditional three-axis can be applied to process high-precision compound cambers, as turbine blades or precision mold, etc.
Five- axis machining technologies can manufacture products of complicated geometrical figure, so they own much more extensive ability of cutting processing. The research applies high twisting force five-axis processing, based on small section of rolling axis head (420x443mm). Its character is reducing interference of processing tub depth. However the function of B/C rolling axis clutch position is hard to reach the demand and the hydraulic tub must occupy most in narrow spaces. With creative disc brake expansion, two discs brake in frictional way within gaps of two discs and hydraulic pressure that produce disc clamps B/C axis angle in expanded deformation to reach exact brake orientation.
ANSYS using optimization material Ni/Steel as the last election，The objective function defined by the results of B/C-axis disc''s thickness is 4mm/3mm，It''s expanded deformation disc space is 0.05mm；After getting the disc enduring load with the ANSYS component analysis，it brings forces to admit the deformation the working force or the designing gap needs. Using the formula to calculate clamping forces by testing machine and the inaccuracy precision of the disc expanded deformation achieves the function of clamping deformation matching number.
The research successfully makes the disc expanded deformation achieved 0.05mm by testing 3 bar ; setting in the design of reserving 0.04~0.07mm space, and finally achieved 0.09mm by testing 30 bar. After testing the expanded deformation, the changing inaccuracy number of back is 0.002mm, very micro-deformation. Testing the hydraulic pressure of 20 bar by testing board, the controller displays the current value is greater than the standard of 39A, clamping until the system displays the overloading high temperature of 61A. To calculate the mechanism clamping of 20 bar in the forecast of brake expansion is 3590Nm, the clamping force can reach the clamping position in the range of 1.5 times. In the condition of 45~50 bar pressure, the frictional coefficient can be obtained 0.3 μ range. The data of experiments and calculating verification are the character of 5000Nm large machining technologies
|
|---|
