Abstract
Wear and deformation CNC grinding machine tool, will be aggravated over time ofwhich will influence the manufacturing precision. To reduce the effect, the soft compensation method by modifying NC instruction was put forward to maintain the manufacturing precision of CNC crankshaft grinding machine tool. The error sources were analyzed, the errors caused by grinding force were calculated, and the precise grinding kinematics model was deduced by the multibody kinematics. Numerical simulation and manufacturing experiment were carried out and the rank tests were taken for the manufactured crankshafts. Experiments show that the manufacturer precision of the crank can be enhanced by 63.69%, 52.06%, 42.27%, and 30.96% by soft compensation of 10 years of service life and 10 μm grinding depth, 4 years of service life and 10 μm grinding depth, 10 years ofservice life and 6 μm grinding depth, and 4 years of service life and 6 μm grinding depth, respectively. Soft compensation can be applied to the machine tool in which the manufacturer precision has declined and the NC instruction with compensation should be updated periodically.
Highlights
Reliability of machine tool can be represented by two parameters of the fault probability of machine tool signed by f(t) and the defective rate of manufactured parts signed by r(t) [1]. f(t) and r(t) will be increased over time . f(t) is affected by the ageing and degradation of the components and parts, and r(t) is affected by the wear and deformation ignoring the human and environment factors
Error model and compensation were deduced from CNC crankshaft grinding machine tool and the validity of error compensation was analyzed by statistical method
The study focus on errors settling of CNC machine tool is error measuring and identifying, kinematics and dynamics of noncircular grinding, and the compensation method
Summary
Reliability of machine tool can be represented by two parameters of the fault probability of machine tool signed by f(t) and the defective rate of manufactured parts signed by r(t) [1]. f(t) and r(t) will be increased over time . f(t) is affected by the ageing and degradation of the components and parts, and r(t) is affected by the wear and deformation ignoring the human and environment factors. The study focus on errors settling of CNC machine tool is error measuring and identifying, kinematics and dynamics of noncircular grinding, and the compensation method. Lechniat et al and Cui et al proposed the method of offline soft compensation for geometrical errors for CNC machine tool in reference [5, 6]. The compensation for combinational errors of geometry and deformation by grinding force has not been studied for CNC crankshaft grinding machine tool. On account of this status, the precise grinding kinematics including geometrical errors and grinding force deformation errors was modeled by Advances in Mechanical Engineering
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