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YAN Zhanhui
School of Mechatronics Engineering,
Changchun Institute of Technology,
Changchun 130012, China
CAO Yi
Machinery & Electric Equipment and
Research Design Institute of Jilin,
Changchun 130012, China
YU Junyi
College of Mechanical Science
& Engineering,
Jilin University,
Changchun 130025, China
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NEW METHOD OF REDUCING HEAT
DEFORMATION OF SLIDEWAY GRINDERS*
Abstract:
A new concept used for designing large-scale and high-precision NC slideway grinders which are called self-collimation slideway grinders is introduced to eliminate thermal deformation of them. Its principle is to make use of gravitational deformation of machine beds and their foundations automatically to compensate for thermal deformation caused by environmental temperature fluctuation and friction heat between machine tables and machine beds by decreasing longitudinal section stiffness of machine beds and foundations. By FEM analysis and application of more than 10 years, it shows that they have advantages of high precision and low cost, moreover, no constant temperature rooms are required. The linearity error of parts machined with them is less than 0.003 mm/m, and machining precision can almost keep constant for a long time.
Key words:
Slideway grinders Heat deformation Self-collimation Flexibility |