Wheel curve generation error of aspheric microgrinding in parallel grinding method

Parallel grinding method has been widely used for advanced optics machining, especially f-θ optics. In order to reduce the dependence on high-precision machine tool with many degrees of freedom (DOF) and obtain high machining accuracy, in this paper, we propose a simultaneous 2-axis method to replace the conventional simultaneous 3-axis method in parallel grinding. Firstly, the algorithm of the simultaneous 2-axis method is explained. Then, the motion control errors and machining errors under simultaneous 3-axis and 2-axis methods are comparably analyzed, respectively. Finally, through grinding experiments, the feasibility of the simultaneous 2-axis method is verified.

Section: Introductionmentioning

confidence: 99%

Research on an optimized machining method for parallel grinding of f-θ optics

Wang

Guo

2015

“…Optimum grinding factors for aspheric convex surface micro-lens were studied by using design of experiments in cross grinding with V-tip diamond wheel [8]. The wheel curve generation error of aspheric micro-grinding was introduced in parallel grinding mode [9]. Micro-aspherical inserts with diameters of 0.2 and 1 mm were successfully ground with the developed micro-grinding strategy with the parallel grinding method in association with an effective wheel preparation and form error compensation techniques [10].…”

Section: Introductionmentioning

confidence: 99%

An investigation into parallel and cross grinding of aspheric surface on monocrystal silicon

Chen

Guo

Zhao

2015

Cross and parallel grinding modes are two typical general grinding modes for aspheric surface in vertical wheel spindle grinding system. In this paper, roughness, surface profile, form accuracy, and wheel wear of the ground aspheric surface utilizing the cross and parallel grinding methods are compared and investigated. Firstly, the maximum undeformed chip thickness of aspheric surface was analyzed in the two grinding modes. And then, the precision grinding of monocrystal silicon for aspheric surface and wheel wear experiments was carried out with the same grinding parameters. Experimental results revealed that the cross grinding mode was advantageous over parallel grinding in terms of achieving precision aspheric surface with a roughness (Ra) of 20.1 nm, form accuracy (PV) of 235 nm, and a steady surface. The change of the maximum undeformed chip thickness in grinding process caused the increased surface roughness from the edge to the center. And without considering the influence of the wheel arc profile form error, better form accuracy was obtained by cross grinding. Besides, the wheel wear modes were significantly different in the two grinding modes. This study gives an indication of the strategy to follow to achieve high-quality ground aspheric surfaces on brittle materials.

“…Spherical surface generating can be achieved by parallel grinding [1][2][3], arc envelope grinding method (AEGM) [4,5], single-point inclined axis grinding [6][7][8], and so on. The method of line contact spherical grinding by cup-shaped wheel with torus end, because of its high efficiency and simple processing, is widely used in the processing of sphere generation especially lens manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…The existing methods of machining error analysis include mainly two types: (1) there is an explicit function relationship between pose error and machining error; therefore, mathematical derivations process can be executed to get the relationship [2,3,6,12,13]. (2) The others are based on multi-body system theory.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Error analysis and compensation of line contact spherical grinding with cup-shaped wheel

Peng

Dai

Song

et al. 2015

According to forming principle of line contact spherical generating by cup-shaped wheel, the sources of grinding error were analyzed, and a new method for error analysis and compensation was proposed in this paper. In a certain grinding condition, the grinding error caused by the pose errors between wheel and workpiece was simulated, the corresponding curve fitting of grinding error was carried out, and an appropriate parametric model was established. If the actual grinding error is known, the model can identify the corresponding pose error as well as compensate the grinding error. The simulation and experiment processes of compensation validate the efficient and workability of parametric model, and improve the grinding precision.