Critical Tolerance Oriented Process Planning in Sheet Metal Bending

1999 ◽  
Vol 121 (1) ◽  
pp. 136-144 ◽  
Author(s):  
M. Shpitalni ◽  
B. Radin
Keyword(s):  
Sheet Metal ◽  
Process Planning ◽  
Tolerance Analysis ◽  
Automatic Determination ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Precedence Graph ◽  
Metal Products ◽  
Bending Sequence

Although bending is one of the final processes in sheet metal part manufacture, it is relatively inaccurate compared to the other components of sheet metal processing. Critical tolerances at several locations on the sheet metal part impose limitations on bending operations and sequences. The lack of success up to now in embedding accuracy in process planning for sheet metal products has resulted mainly from the fact that tolerance analysis usually requires simulating the manufacturing process. This paper discusses the issue of automatic determination of the bending sequence in sheet metal products subject to critical tolerance constraints. It proposes conditions for identifying cases where the problem of determining the bending order which results in the best accuracy at specific locations is, in fact, a topological problem. Two explicit rules for achieving the best accuracy in such cases are formulated and then demonstrated by using these rules to construct a precedence graph.

Two-Stage Algorithm for Determination of the Bending Sequence in Sheet Metal Products

1997 ◽  
Vol 119 (2) ◽  
pp. 259-266 ◽  
Author(s):  
B. Radin ◽  
M. Shpitalni ◽  
I. Hartman
Keyword(s):  
Sheet Metal ◽  
Low Cost ◽  
Combinatorial Problem ◽  
Two Stage ◽  
Practical Applications ◽  
Second Stage ◽  
Metal Products ◽  
Bending Sequence ◽  
Time Limitations

This paper presents an algorithm for solving the complex and critical problem of bending sequence in sheet metal manufacturing. Finding the bending sequence and required tool assignment presents a large combinatorial problem which is impossible to solve optimally for practical applications within a reasonable period of time. The paper presents a two-stage algorithm. The first stage finds a feasible solution based upon collision avoidance heuristics. The second stage rapidly seeks an alternative feasible sequence with a lower cost without exceeding time limitations. The algorithm is very practical because it reaches a low-cost solution quickly within computer memory limitations. In this paper, the problem is defined, the approach is presented formally, and finally, the power of the algorithm is demonstrated by solving bending sequences for real products.

Exploration of Evolutionary Path Planning of Part Handling in Sheet Metal Bending

2003 ◽  
Author(s):  
Xiaoyun Liao ◽  
G. Gary Wang
Keyword(s):  
Path Planning ◽  
Sheet Metal ◽  
Motion Path ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Sheet Metal Parts ◽  
Detection Algorithms ◽  
Shaped Part ◽  
Bending Sequence

While the bending sequence planning has been intensively studied, design of the motion path of a sheet metal part in the bending operation tends to be ignored by researchers. Because during the bending operation, the space for maneuvering a sheet metal part is very small, collisions between the part and bending tools are likely to occur. When a robot is used to handle the part, the role of an automatic path-planning tool becomes more significant. In this study, an evolutionary pathplanning approach for robot-assisted handling of sheet metal parts in bending is proposed and implemented. The proposed approach globally searches the motion path space to identify feasible paths. Collision detection algorithms based on segment intersection are used to check the feasibility of the generated paths. This method can automatically design feasible handling operations for a robot. A simulation example on a simple “V” shaped part demonstrates that the approach is efficient and practical.

Extraction of Process Parameters from a Sheet Metal Part Model

2014 ◽  
Vol 592-594 ◽  
pp. 888-893
Author(s):  
Pothala Sreenu ◽  
Ravi Kumar Gupta
Keyword(s):  
Sheet Metal ◽  
Process Planning ◽  
Process Parameters ◽  
Feature Recognition ◽  
Research Work ◽  
Computer Integrated Manufacturing ◽  
Actual Process ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Part Model

Process planning in a computer integrated manufacturing (CIM) requires integrated system for design and manufacturing activities. For sheet metal part, feature recognition and feature reasoning of a product model for process planning is an essential component of CIM environment. Research work for feature recognition and reasoning has been addressed in literature, which is limited to the geometric and topological information but actual process parameters requited for manufacturing operation is still an open issue. Our research is for extraction of process parameters from a sheet metal part model which is in STEP Format. These process parameters can be used in sheet metal manufacturing to control the operations. This paper presents extraction of process parameters for a sheet metal feature from a sheet metal part model (STEP Format). This work then formulates the feature processes in terms of extracted process parameters, material properties, sheet metal dimension and feature dimension. The actual operation in real manufacturing environment is identified as extension of the proposed work. The extraction of process parameters for sheet metal operation is demonstrated with case studies.

A New Stretch-Forming Process Based on Loading at Discrete Points and its Numerical Investigation

2013 ◽  
Vol 423-426 ◽  
pp. 737-740
Author(s):  
Zhong Yi Cai ◽  
Mi Wang ◽  
Chao Jie Che
Keyword(s):  
Sheet Metal ◽  
Three Dimensional ◽  
Discrete Point ◽  
Stretch Forming ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Forming Process ◽  
Loading Trajectory ◽  
New Process ◽  
Forming Defects

A new stretch-forming process based on discretely loading for three-dimensional sheet metal part is proposed and numerically investigated. The gripping jaw in traditional stretch-forming process is replaced by the discrete array of loading units, and the stretching load is applied at discrete points on the two ends of sheet metal. By controlling the loading trajectory at the each discrete point, an optimal stretch-forming process can be realized. The numerical results on the new stretch-forming process of a saddle-shaped sheet metal part show that the distribution of the deformation on the formed surface of new process is more uniform than that of traditional stretch-forming, and the forming defects can be avoided and better forming quality will be obtained.

scholarly journals Topology Optimization of Automotive sheet metal part using Altair Inspire

2020 ◽  
Vol 5 (3) ◽  
pp. 143-150
Author(s):  
Netsanet Ferede
Keyword(s):  
Topology Optimization ◽  
Sheet Metal ◽  
Optimization Problem ◽  
Optimal Solution ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Solution Quality ◽  
Design Engineers ◽  
Automotive Sheet ◽  
Reduced Costs

In an optimization problem, different candidate solutions are compared with each other, and then the best or optimal solution is obtained which means that solution quality is fundamental. Topology optimization is used at the concept stage of design. It deals with the optimal distribution of material within the structure. Altair Inspire software is the industry's most powerful and easy-to-use Generative Design/Topology Optimization and rapid simulation solution for design engineers. In this paper Topology optimization is applied using Altair inspire to optimize the Sheet metal Angle bracket. Different results are conducted the better and final results are fulfilling the goal of the paper which is minimizing the mass of the sheet metal part by 65.9%  part and Maximizing the stiffness with Better Results of Von- Miss Stress Analysis,  Displacement, and comparison with different load cases.  This can lead to reduced costs, development time, material consumption, and product less weight.

scholarly journals IDS-DLA: Sheet Metal Part Identification System for Process Automation Using Deep Learning Algorithms

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 127329-127342
Author(s):  
Ruey-Kai Sheu ◽  
Yuan-Cheng Lin ◽  
Chin-Yin Huang ◽  
Lun-Chi Chen ◽  
Mayuresh Sunil Pardeshi ◽  
...  
Keyword(s):  
Deep Learning ◽  
Sheet Metal ◽  
Learning Algorithms ◽  
Identification System ◽  
Process Automation ◽  
Sheet Metal Part ◽  
Metal Part

A new rotary forming process for rim thickening of a disc-like sheet metal part

2012 ◽  
Vol 212 (11) ◽  
pp. 2247-2254 ◽  
Author(s):  
Jun-Song Jin ◽  
Lei Deng ◽  
Xin-Yun Wang ◽  
Ju-Chen Xia
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Forming Process

3D Parametric Unfolding Method for Sheet-Metal Part

2014 ◽  
Vol 488-489 ◽  
pp. 79-82
Author(s):  
Bo Sun ◽  
Long Chen
Keyword(s):  
Sheet Metal ◽  
3D Modeling ◽  
Mathematic Model ◽  
Design System ◽  
Automatic Design ◽  
Sheet Metal Part ◽  
Metal Part ◽  
3D Environment ◽  
Unfolding Method

The unfolding is the first step for the manufacturing of the sheet-metal part, which plays a major role for the accuracy and quality of the final product. Unfortunately, the inefficiency of the traditional drawing-based method made the process boring and sometime confusing. The CAD method made benefit for the designer. By means of the 3D modeling kernel and the mathematic model of unfolding process, the automatic design system of sheet-metal part was developed, in which the models are parametric and in 3D environment.

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