KBS-aided design of tube bending processes

Zhou, Jin; Luo, Shizhuang; Fang, Xianwen

doi:10.1016/s0952-1976(01)00016-1

Cited by 24 publications

(6 citation statements)

References 11 publications

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“…In [14] a knowledge-based system has been developed to aid the design of tube bending processes. Object-oriented programming techniques and goal-driven search mechanisms, featured by an interactive graphic user interface, have been applied in the development of the proposed knowledge-based system.…”

Section: State Of the Art For Computer Based Process Design Of Rotarymentioning

confidence: 99%

Automatic tooling design for rotary draw bending of tubes

Strano

2005

Int J Adv Manuf Technol

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Cold rotary draw bending of tubes is a CNC metal forming process widely used in industry. When planning a new process, trial and error is often required in order to calculate the proper overbending and to avoid wrinkling, excessive thinning and flattening. Process design is a critical, difficult, experience based activity, that requires the selection of several variables. In this paper, a comprehensive, computer-based methodology, called Tube ProDes, is proposed for process design of the rotary draw bending of tubes. The approach can be described as follows. First, numerical calculations are carried out in order to compensate for springback, to evaluate the severity of the bend (i.e. the risk of the occurrence of defects), and to assess the sensitivity of the process to a change in the material properties. Then, the tooling setup is completely designed by fuzzy logic, using the tube material properties, the geometrical data of the bend and the variables previously calculated as input

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Section: State Of the Art For Computer Based Process Design Of Rotarymentioning

confidence: 99%

Automatic tooling design for rotary draw bending of tubes

Strano

2005

Int J Adv Manuf Technol

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“…Fang and Tolouei-Rad [5] proposed a rule based expert system for process planning of complex circular shells produced by deep-drawing process. Jin et al [6] developed a knowledge based system (KBS) for design of tube bending processes, including bending methods selection, tool/die design, and process parameters setup. Kang and Park [7] proposed a computer-aided process planning (CAPP) system for rotationally symmetric deep drawing products.…”

Section: Introductionmentioning

confidence: 99%

An expert system for process planning of sheet metal parts produced on compound die for use in stamping industries

et al. 2016

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Process planning of sheet metal part is an important activity in the design of compound die. Traditional methods of carrying out this task are manual, tedious, time-consuming, error-prone and experiencebased. This paper describes the research work involved in the development of an expert system for process planning of sheet metal parts produced on compound die. The proposed system is organized in six modules. For development of system modules, domain knowledge acquired from various sources of knowledge acquisition is refined and then framed in form of 'IF-Then' variety of production rules. System modules are coded in AutoLISP language and user interface is created using visual basic (VB). The system is capable to automate various activities of process planning including blank modeling, blank nesting, determining punch force required, selection of clearance between punch and die, identifying sheet metal operations, and determining proper sequence of operations for manufacturing the part. The proposed system can be implemented on a PC having VB and AutoCAD software, therefore its low cost of implementation makes it affordable even for small scale sheet metal industries.

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“…For relatively easy bending processes (that is, as the difficulty factor BF decreases), the tooling can be progressively simplified [6,7], eliminating the need for the axial assist, the mandrel, and the wiper die (which mostly prevents wrinkling). Furthermore, in some particular cases, the standard tooling must be modified in order to meet specific requirements of the products.…”

Section: Introductionmentioning

confidence: 99%

Rotary draw bending of small diameter copper tubes: predicting the quality of the cross-section

Mentella¹,

Strano

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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The purpose of the present work is to study the correlation between the main geometrical tube parameters of the rotary draw bending process and the resulting quality of the cross-section of small hydraulic pipings. The method of choice, named free rotary draw bending, is a rotary draw bending process where no internal support from an internal mandrel or plug is\ud possible, because hydraulic tubes cannot be lubricated on their internal diameter. Furthermore, no axial boosting of the tube or of the pressure die is applied. Free bending is mainly used when\ud small-diameter tubes are involved, with high length and relatively thin wall. \ud A unique quality estimator QCS of the cross-section geometry of bent tubes has been developed, which is able to synthetically represent the main functional and aesthetical properties of tubes:\ud the maximum ovalization, the minimum hydraulic diameter, and so on. In the case of copper tubes for hydraulic applications a strongly deformed cross-section after bending means a poor\ud quality of the product, since it delivers an increase of head losses and of pressure drops. The deformation occurring in the cross-section of the tube has been studied through a set of FEM simulations, run with an explicit code with shell elements, and the model has been validated by comparing the experimental and numerical results of specific cases, in terms of geometry of\ud the cross-section in a 90 bend. The plan of simulations has been designed using the typical copper tube dimensions for hydro-thermo-sanitary applications and a few runs have been added with modified parameters with the aim of completing the plan for evaluating the sensitivity to a change either in geometrical variables (thickness t, outer diameter OD, mean bending radius RM) or in the tube material. An indicator (bending factor) is proposed, able to reliably estimate the difficulty of a bending process with respect to tendency to ovalization and collapse of the crosssection.\ud Some design guidelines of the bending tools are provided

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KBS-aided design of tube bending processes

Cited by 24 publications

References 11 publications

Automatic tooling design for rotary draw bending of tubes

Automatic tooling design for rotary draw bending of tubes

An expert system for process planning of sheet metal parts produced on compound die for use in stamping industries

Rotary draw bending of small diameter copper tubes: predicting the quality of the cross-section

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