A new format for 5-axis tool path computation, using Bspline curves

Langeron, Jean Marie; Duc, Emmanuel; Lartigue, Claire; Bourdet, Pierre

doi:10.1016/j.cad.2003.12.002

Cited by 160 publications

(72 citation statements)

References 19 publications

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“…In order to illustrate the scalability criterion, a NURBS interpolator was integrated to the ITP of the laboratory. NURBS curves, which are usually not accessible in legacy controllers [4,12,22], are often used to describe CAD models. As a result, the numerical data chain has been homogenized, as shown in Figure 15, which represents those tool paths difficult for using linear and circular interpolations.…”

Section: Addition Of a Nurbs Tool Path Interpolatormentioning

confidence: 99%

Enabling Advanced CNC Programming with openNC Controllers for HSM Machines Tools

Hascoët¹,

Rauch²

2016

High Speed Machining

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Abstract:The manufacturing area has benefited from various progresses over the last decades, such as High Speed Machining (HSM), but CNC programming is still based on dated practices and habits with a segmented unidirectional CAD/CAM/CNC data chain. Decision power is limited at the NC controller stage and online process optimization is difficult. In contrast, advanced programming approaches, such as STEP-NC [9], aim to unify the product/process data within a consistent environment from design to machining. Hence, openNC controller solutions which allow access to their internal algorithms, have emerged. It is consequently possible to implement new tool path control algorithms that respond directly to the actual machining condition. This paper focuses on the interest of openNC controllers to develop advanced programming approaches for HSM processes. The major drawbacks of legacy controllers in the implementation of advanced tool path generation methods are discussed and the most significant openNC projects are reviewed. An integrated test platform has been developed. The advanced HSM programming methods enabled by this openNC controller are discussed.

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Section: Addition Of a Nurbs Tool Path Interpolatormentioning

confidence: 99%

Enabling Advanced CNC Programming with openNC Controllers for HSM Machines Tools

Hascoët¹,

Rauch²

2016

High Speed Machining

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“…Siemens840D NC system adopts double NURBS curve for five-axis linkage NC machining instruction format, which can improve the interpolation speed and precision. 13 Langeron et al 14 utilized dual NURBS tool path with unequal distance (DNTPUD) to describe the five-axis linkage cutting tool path and demonstrated the C 2 continuous advantages on improving machining efficiency in comparison with the linear tool path. Bi et al 15 extended this idea by giving a method to obtain dual NURBS tool path with equal distance (DNTPED).…”

Section: Introductionmentioning

confidence: 99%

Dual-Bézier path smoothing and interpolation for five-axis linear tool path in workpiece coordinate system

Jin

Wang

2015

Advances in Mechanical Engineering

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The tool path composed of consecutive short linear segments (G01 blocks) is still the widespread tool path representation form in five-axis machining. The inherent shortcoming of linear tool path is first-order discontinuity at the corner, which is the bottleneck to achieve high-speed and high-accuracy machining. In this article, a dual-Bézier path smoothing algorithm for five-axis linear tool path in workpiece coordinate system is proposed. There are three steps involved in our method. First, the corner error distribution model is introduced to assign the given tolerance to the smoothing approximation error constraint and the chord error constraint to ensure the interpolation trajectory error within the given tolerance. Second, segment junctions of the linear tool path in workpiece coordinate system are smoothed by double G 2 continuous cubic Bézier curves. One cubic Bézier curve is used to round the corner of the tool tip point path, and the other Bézier curve is used to round the corner of the tool axis point path. This algorithm takes the conditions of approximation error constraint, the parameterized synchronization constraint, and continuous curvature constraint into consideration. Hence, the tangency and curvature continuities are both guaranteed in the new path. Third, an adaptive feedrate scheduling method is introduced to interpolate the new path. Simulation and experiment are performed to verify the effectiveness of the proposed method in five-axis tool path smoothing, speed smoothing, and trajectory accuracy controlling.

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“…In order to realize the efficient manufacturing through intensive manufacturing processes, multi-axis control machine tools attract a wide attention. Among them, 5-axis control machine tools are actively introduced into machine shops so that they can reduce the number of processes a part has to go through, due to the flexibility brought on by their kinematic design in planning the machining tool path (1) . 5-axis control machining enables the processing of workpieces with complicated shape such as overhanging surface without fitting workpieces several times since it has high degrees of freedom with regard to the tool posture.…”

Section: Introductionmentioning

confidence: 99%

5-Axis Control Tool Path Generation Using Curved Surface Interpolation

Morikawa

Ishida

Teramoto

et al. 2006

JSME Int. J., Ser. C

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In 5-axis control machining, it is important to reduce the processing time of generating interference-free tool path between a tool and a workpiece. Thus, the paper describes a method to determine interference-free tool posture, based on not every cutting point but every path. The system generates a ruled surface between an offset curve from cutting points and a parametric curve on an interference surface. Rotation of the ruled surface by moving control points on it allows a boundary tool locus, which does not interfere with a workpiece. Tool postures corresponding to a cutting point curve are rapidly determined by appropriately selecting the curve within the area surrounded by two ruled surfaces. The effectiveness of the proposed method is demonstrated by making a cutting experiment of an impeller.

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A new format for 5-axis tool path computation, using Bspline curves

Cited by 160 publications

References 19 publications

Enabling Advanced CNC Programming with openNC Controllers for HSM Machines Tools

Enabling Advanced CNC Programming with openNC Controllers for HSM Machines Tools

Dual-Bézier path smoothing and interpolation for five-axis linear tool path in workpiece coordinate system

5-Axis Control Tool Path Generation Using Curved Surface Interpolation

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