scholarly journals Automatic Robot Trajectory for Thermal-Sprayed Complex Surfaces

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Dandan Fang ◽  
You Zheng ◽  
Botao Zhang ◽  
Xiangbo Li ◽  
Pengfei Ju ◽  
...  
Keyword(s):  
Complex Geometry ◽  
Automatic Generation ◽  
Simulation Software ◽  
Spray Angle ◽  
Free Form ◽  
Spray Parameters ◽  
Automotive Manufacturing ◽  
Robot Trajectory ◽  
Free Form Surfaces ◽  
The Given

Automatic trajectory generation for thermal spray application is highly desirable for today’s automotive manufacturing. Automatic robot trajectory for free-form surfaces to satisfy the coating uniform is still highly challenging due to the complex geometry of free-form surfaces. The purpose of this study is to present and implement a method for automatic generation of robot trajectory according to the given spray parameters on polygon profile and complex curved free-form surfaces, such as torch speed, spray distance, spray angle, and so on. This software development foundation is an Add-In programme of RobotStudio, which is off-line programming and simulation software of ABB Company. The experimental results show that the robot trajectory can be generated rapidly, accurately, and automatically on the complex geometries by this method.

CAD-GUIDED SPRAY GUN TRAJECTORY PLANNING OF FREE-FORM SURFACES IN MANUFACTURING

2003 ◽  
Vol 02 (01) ◽  
pp. 47-69 ◽  
Author(s):  
HEPING CHEN ◽  
NING XI ◽  
YIFAN CHEN ◽  
JEFFREY DAHL
Keyword(s):  
Trajectory Planning ◽  
Complex Geometry ◽  
Trajectory Generation ◽  
Free Form ◽  
Generation System ◽  
Automotive Manufacturing ◽  
Robot Trajectory ◽  
Satisfactory Performance ◽  
Paint Thickness ◽  
Free Form Surfaces

Automatic trajectory generation for spray painting is highly desirable for today's automotive manufacturing. Generating paint gun trajectories for free-form surfaces to satisfy paint thickness requirements is still highly challenging due to the complex geometry of free-form surfaces. In this paper, a CAD-guided paint gun trajectory generation system for free-form surfaces has been developed. The system utilizes the CAD information of a free-form surface to be painted and a paint gun model to generate a paint gun trajectory to satisfy the paint thickness requirements. The paint thickness deviation from the required paint thickness is optimized by modifying the paint gun velocity. A paint thickness verication method is also provided to verify the generated trajectories. The results of simulations have shown that the trajectory generation system achieves satisfactory performance. This trajectory generation system can also be applied to generate trajectories for many other CAD-guided robot trajectory planning applications.

Automatic Generation of Anisotropic Patterns of Geometric Features for Industrial Design

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Diego Andrade ◽  
Ved Vyas ◽  
Kenji Shimada
Keyword(s):  
Boundary Conditions ◽  
Computer Aided Design ◽  
Industrial Design ◽  
Automatic Generation ◽  
Free Form ◽  
Geometric Features ◽  
Target Domain ◽  
Metric Tensor ◽  
Target Region ◽  
Free Form Surfaces

While modern computer aided design (CAD) systems currently offer tools for generating simple patterns, such as uniformly spaced rectangular or radial patterns, these tools are limited in several ways: (1) They cannot be applied to free-form geometries used in industrial design, (2) patterning of these features happens within a single working plane and is not applicable to highly curved surfaces, and (3) created features lack anisotropy and spatial variations, such as changes in the size and orientation of geometric features within a given region. In this paper, we introduce a novel approach for creating anisotropic patterns of geometric features on free-form surfaces. Complex patterns are generated automatically, such that they conform to the boundary of any specified target region. Furthermore, user input of a small number of geometric features (called “seed features”) of desired size and orientation in preferred locations could be specified within the target domain. These geometric seed features are then transformed into tensors and used as boundary conditions to generate a Riemannian metric tensor field. A form of Laplace's heat equation is used to produce the field over the target domain, subject to specified boundary conditions. The field represents the anisotropic pattern of geometric features. This procedure is implemented as an add-on for a commercial CAD package to add geometric features to a target region of a three-dimensional model using two set operations: union and subtraction. This method facilitates the creation of a complex pattern of hundreds of geometric features in less than 5 min. All the features are accessible from the CAD system, and if required, they are manipulable individually by the user.

Surface Quality Prediction in Case of Steep Free Form Surface Milling

2016 ◽  
Vol 686 ◽  
pp. 119-124 ◽  
Author(s):  
Balázs Mikó
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Tool Path ◽  
Complex Geometry ◽  
Cutting Parameters ◽  
Free Form ◽  
Milling Cutter ◽  
Good Surface ◽  
2.5D Milling ◽  
Free Form Surfaces

The machining of free form surfaces is a current and important issue in die and mould industry. Beside the complex geometry, an accurate and productive machining and good surface quality are needed. The finishing milling carried out by a ball-end or toroid milling cutter defines the surface quality, which is characterized by the surface roughness and the tool path trace. The surface quality is defined by the properties of the milling cutter, the type of surface and its position, as well as the cutting parameters. This article focuses on the z-level milling of steep surfaces by 2.5D milling strategy. The importance of the different elements of the tool path is presented, the effect of cutting parameters is investigated, and a formula to predict the surface roughness is suggested.

Application of Haptic Navigation to Modify Free-Form Surfaces Through Specified Points and Curves

2002 ◽  
Vol 2 (4) ◽  
pp. 265-276 ◽  
Author(s):  
Masatake Higashi ◽  
Nobuaki Aoki ◽  
Takanobu Kaneko
Keyword(s):  
Real Time ◽  
Force Feedback ◽  
Correction Function ◽  
Free Form ◽  
Cardinal Spline ◽  
Trimmed Surface ◽  
Pass Through ◽  
Free Form Surfaces ◽  
The Given ◽  
Haptic Sensation

In this paper, we propose a method which modifies free-form surfaces to pass through not only specified points, but also specified curves with the assistance of haptic navigation. Using the method, designers of aesthetic shapes, such as a car body, can manipulate the model of the shape in real-time looking at its stereoscopic image and feeling its haptic sensation as if there were a clay model. The haptic navigation helps designers, letting them capture and recognize the object easily and constraining their operation to the appropriate direction or along the specified geometric element. In addition, the designers can get force feedback proportional to the modification quantity. To obtain a smoothly modified shape, we introduce correction functions to the given surface equations. A correction function distributes the effect of the change over the whole shape or the specified region according to the distance of the point in the normal direction of the given surface. The values of the correction function are 1 at the indicated point and 0 at the boundaries, and the shape is modified to keep the original smoothness. The correction values of the functions at the indicated points are determined to pass through all of them by solving a linear equation. To apply this to the specified curves including boundaries of a trimmed surface, we treat points composing the curve similarly to the point specification by representing them with a Cardinal spline. We have confirmed that the system is effective to manipulate a shape with its feeling and that smooth surfaces are obtained in real time as designers want.

Stability Analysis of the MRT-Based Compliant Polishing Tool System

2012 ◽  
Vol 201-202 ◽  
pp. 473-476
Author(s):  
Chong Yang Yuan ◽  
Di Zheng ◽  
Jian Ming Zhan ◽  
Li Yong Hu
Keyword(s):  
Geometric Modeling ◽  
Mixed Model ◽  
Simulation Software ◽  
Free Form ◽  
Cnc Milling ◽  
Element Analysis ◽  
Compliant Polishing ◽  
The Stability ◽  
Free Form Surfaces ◽  
Polishing Tool

In order to meet the needs for the precise polishing of free-form surfaces, a new compliant polishing tool system was designed based on a magnetorheological torque servo (MRT), and integrated into a CNC milling machine. Through analysis, it was pointed out that the key factor affecting the polishing quality of this system is the stability of the system. By means of the 3D geometric modeling software ProE, the finite element analysis software ANSYS, and the dynamic simulation software ADAMS, the rigid-flexible mixed model of the system was established and the stability of the polishing pressure and tool position was numerically analyzed.

scholarly journals Laplacian-based Design: Sketching 3D Shapes

2006 ◽  
Vol 5 (3) ◽  
pp. 59-65 ◽  
Author(s):  
Bin Sheng ◽  
Enhua Wu
Keyword(s):  
Free Form ◽  
3D Space ◽  
3D Profile ◽  
Free Form Surfaces ◽  
The Given ◽  
2D Sketch ◽  
Laplacian Equations ◽  
3D Shapes ◽  
Minimum Curvature ◽  
3D Surfaces

The sketch-based shape modeling is one of the most challenging and active problems in computer graphics. In this paper, we present an interactive modeling system for generating free-form surfaces using a 2D sketch interface. Since inferring 3D shape from 2D sketches is an one to many function with no unique solution, we propose to interpret the given 2D curve to be the projection of the 3D curve that has minimum curvature among all the candidates in 3D. In this way, firstly, we present an algorithm to efficiently find a close approximation of this minimum curvature 3D space curve. In the second step, our system could identify the 3D surfaces automatically, and then we apply Delaunay triangulation on these surfaces. Finally, the shape of the triangular surface mesh that follows the 3D profile curves is computed using harmonic interpolation by solving Laplacian equations. We present experimental results on various kinds of drawings by the interactive modeler

Automatic Side-Cores Construction in Injection Plastic Mold Design for Free-Form NURBS Surface Models

2013 ◽  
Vol 275-277 ◽  
pp. 2635-2639 ◽  
Author(s):  
Nguyen Huu Quang ◽  
Alan C. Lin
Keyword(s):  
Computer Aided Design ◽  
Complex Geometry ◽  
Automatic Generation ◽  
Free Form ◽  
Mold Design ◽  
Manufacturing Cost ◽  
Synthetic Approach ◽  
Nurbs Surface ◽  
Surface Models ◽  
Aided Design

In computer-aided design for moldings, automatic generation of side-cores is a crucial design task that has an influence on the entire mold structure and manufacturing cost. This paper proposes a synthetic approach for creating the side-cores of free-form NURBS surface models. Based on the geometric properties of entities, surfaces of undercut features which are molded for side-cores are identified. After determining the withdrawal directions for each group of undercut’s surface features, the number of side-cores is optimized. The heads and the bodies of side-cores are finally obtained through the combination of the Boolean operation and 3D oriented extrusion. The algorithm is efficiently for both protruded and indented portions of undercut features. A complex industrial part is used to demonstrate the performance and robustness of the proposed algorithm. Since the approach is generic in nature, it is easy to be applied to any complex geometry in 3D mold design.

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