A practical approach for partitioning free-form surfaces

Tường, Nguyễn Văn; Pokorný, Přemysl

doi:10.1080/0951192x.2010.506656

Cited by 29 publications

(5 citation statements)

References 19 publications

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“…After decades of research, the scientists have produced aspheric lenses. Aspheric lenses are widely adopted in various optical systems due to their smaller bulk mass, lower aberrations and higher optical properties compared to spherical lenses [9][10][11]. With the increasing demands of technological products on the imaging quality of optical systems, aspheric lenses are also unable to fulfill the index requirements of optical products [12].…”

Section: Main Display Imaging Systemsmentioning

confidence: 99%

Research on Virtual Reality Head-Mounted Displays based on MEMS Technology

Ren

Dong

et al. 2023

J. Phys.: Conf. Ser.

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In order to render the gaze area and increase the pixels per degree of the area, this virtual reality head-mounted display device adds two MEMS 2D miniature scanning mirrors to the main display imaging, with a laser diode as the projection light source and the main display as the projection receiving screen. The light emitted by the laser lamp is projected onto the main display through multiple reflections. Through pre-processing of the image of the main display and the projected display, the image of the main display is combined with the projected image to achieve the rendering effect. It is integrated with an eye tracking system that allows the projected image to be consistently projected on the human eye area. The projection image is projected over the entire imaging area of the main display by resonant rotation of two MEMS 2D microscope mirrors.

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Section: Main Display Imaging Systemsmentioning

confidence: 99%

Research on Virtual Reality Head-Mounted Displays based on MEMS Technology

Ren

Dong

et al. 2023

J. Phys.: Conf. Ser.

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“…These supplementary tests are conducted using common methods in the industry to generate models using computer-aided design (CAD) systems. A third model, Surface 3 shown in Figure 9(a), is defined using an algebraic equation (19), where x runs from 0 to 100 and y runs from 0 to 40. For this case, a grid of surface points and surface normal was calculated using the equation.…”

Section: Rbm Applied To Machining Strategiesmentioning

confidence: 99%

Rolling ball method applied to 3½½-axis machining for tool orientation and positioning and path planning

Roman

Barocio

Huegel

et al. 2015

Advances in Mechanical Engineering

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In 3½½-axis machining, the machined part surface is partitioned in pre-processing in order to calculate the tool position and patch boundaries and then machined in patches, thereby minimizing the intermediate manual part re-positioning and the overall machining time. Each patch requires a constant, but different, tool orientation. In previous research, local properties have been used to subdivide surfaces into patches. For an ideal tool position and orientation, however, the tool's shape and curvature should exactly match the shape and curvature of the part surface. The rolling ball method, originally developed for 5-axis machining, considers the regional characteristics of tool positioning. This work extends the rolling ball method to 3½½-axis machining, thereby successfully delivering 5-axis quality with currently installed 3-axis computer numerical control milling machines. The pseudo-radius of curvature provides a novel geometrical subdivision criterion. Two Bézier curved surfaces are tested and compared with the 5-axis rolling ball method. Two additional surfaces are presented to further demonstrate the partitioning capability of the method. The results suggest that the rolling ball method for 3½½-axis machining is comparatively competitive in performance and quality.

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“…Freeform surfaces, also called sculptured surfaces are commonly used to produce components in aerospace, automotive and medical industry [1]- [3]. These surfaces are designed to meet aesthetic or functional requirements and are usually produced using 3-and 5-axis machining.…”

Section: Introductionmentioning

confidence: 99%

Tool path generation for sculptured surfaces with 4-axis machining

García¹,

Cuan-Urquizo

Román-Flores

et al. 2018

MATEC Web Conf.

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Sculpted surfaces are widely used in engineering applications in industries like aerospace, automotive and medical. Commonly, these types of surfaces are manufactured by the process of 5-axis CNC machining. 5-axis machining improves the effectiveness and reduction in machining times compared to the 3-axis process, but also increases the complexity of the operations. This paper presents a four-axis toolpath generation gouging free methodology as an alternative to the five-axis machining to reduce the complexity of the process, maintaining similar benefits respect to conventional three-axis machining. Rolling ball method is first applied to compute the most suitable tool for the surface and prevent gouging. A process procedure is the carried out to optimize the tool fixed position and compute tool location at each cutter contact point of the surface. The results show the effectiveness of the method in terms of reducing machining time and maintaining similar surface finishing compared with three-axis machining. The method can be used as a cost-effective option for multi-axis machining.

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A practical approach for partitioning free-form surfaces

Cited by 29 publications

References 19 publications

Research on Virtual Reality Head-Mounted Displays based on MEMS Technology

Research on Virtual Reality Head-Mounted Displays based on MEMS Technology

Rolling ball method applied to 3½½-axis machining for tool orientation and positioning and path planning

Tool path generation for sculptured surfaces with 4-axis machining

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