Recognition of undercut features and parting surface of moulded parts using polyhedron face adjacency graph

Ranjan, Rakesh; Tiwari, Manoj Kumar

doi:10.1007/s00170-006-0574-7

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…It is assumed that the parting direction is already known to the user. Combining the system presented in the article along with the previously developed systems that address automatic determination of parting direction, 32–36 identification of undercut features and their location 37–39 in an automated manner would make the system more useful and significantly increase the level of automation. Some other characteristics which affect die-cast part quality that have not been considered in the present system are as follows: (1) die runs too hot or too cold due to spray conditions, water flow, hot oil temperature, and so on and (2) the process runs with an inconsistent cycle time.…”

Section: Resultsmentioning

confidence: 99%

A system for computer-aided gating design for multi-cavity die-casting dies

Kumar

Madan

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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The gating system design for a die-casting die is a non-trivial task that involves a number of steps and computations, in which many factors related to part design, material, and process need to be accounted. In case of a multi-cavity die-casting die, the non-triviality of the gating system design increases manifold. The main contribution of this article is to develop a computer-aided system for design of gating system for multi-cavity die-casting dies. The proposed system applies design knowledge and rules, accounting for various influencing factors to design gating system elements and generate their computer-aided design models in an efficient manner. To demonstrate the capabilities of the developed system, the results for an industrial case study part are presented. We expect that the proposed system would help reduce manufacturing cost and lead time, alongside bridging gaps between design and manufacturing of the die-casting process.

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Section: Resultsmentioning

confidence: 99%

A system for computer-aided gating design for multi-cavity die-casting dies

Kumar

Madan

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Banerjee and Gupta 19 computed candidate retraction space for facets of an undercut feature in a given parting direction along with determination of a discrete set of feasible retraction spaces. Kumar et al 20 applied polyhedron face adjacency graph technique to recognize completely and partially visible undercuts based on the angle between the adjacent polyhedron. The concepts of feature recognition and surface de-mouldability and mouldability for identification and classification of undercut features were reported by Madan et al 21 and Fu, 22 respectively.…”

Section: Previous Research and Objectives Of This Workmentioning

confidence: 99%

“…The blind depression (or isolated depression) is simplest of the depression features having convex edge loop at the outer convex surface and a NCE loop at the inner NCS as shown in Figure 7(a). 20…”

Section: Classification Of Undercut Featuresmentioning

confidence: 99%

Automated identification of complex undercut features for side-core design for die-casting parts

Singh

Madan

Kumar

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article describes automated identification, classification, division and determination of release direction of complex undercut features of die-cast parts. The proposed system uses the concepts of visibility and accessibility to identify undercut features from a B-rep model of a die-casting part. The undercut features are then classified using a rule-based algorithm. Thereafter, the identified complex undercut features are separated into simple ones. Finally, the release direction for each simple undercut feature is determined and those having common release direction are grouped. The proposed system is implemented on case study die-cast parts, and the results are verified. This article would help bridge the design-manufacturing integration gaps in the die-casting process.

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“…all those areas of the model that are in the shadow of the direction of extraction of the model itself. Multiple systems of automatic undercut recognition are now consolidated, according to the geometry to be obtained by means of the mold, starting from three-dimensional CAD models [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Procedure to Design a Positionable and Stable Drilling Template for Spine Surgery

Cappetti

Brancaccio

Sio

et al. 2021

Lecture Notes in Mechanical Engineering

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Spine surgery is based, nowadays, on the use of cutting-edge instruments that optimize the intervention processes in the operating room, with advantages that affect the patient himself. Among these, rapid prototyping is configured as a first-rate tool, thanks to its ability to detail the diagnostic treatment according to the specific pathological case under examination. An example of this technology is represented by the generation of a drilling template, to assist the surgeon in identifying the optimal direction of insertion of the pedicle screws, capable of significantly reduce intervention times, in addition to the inevitable exposure of the patient to ionizing radiation, to which he is subjected during a normal arthrodesis intervention procedure. The design of a drilling guide requires, however, a particular attention in identifying the undercuts present on the vertebral surface, those areas of the spinous process which, reported inside the cavity of the template, involve complications at the time of extraction. In parallel, it is vitally important to carry out an evaluation of its stability during its use. In this article, starting from the analysis of the interferences present during the insertion of the template, a semi-automatic correction model is proposed for the generation of a new profile of the same, which facilitates its extraction without causing injury to the vertebral regions involved from the contact with the mask.

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Recognition of undercut features and parting surface of moulded parts using polyhedron face adjacency graph

Cited by 17 publications

References 13 publications

A system for computer-aided gating design for multi-cavity die-casting dies

A system for computer-aided gating design for multi-cavity die-casting dies

Automated identification of complex undercut features for side-core design for die-casting parts

A Novel Procedure to Design a Positionable and Stable Drilling Template for Spine Surgery

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