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

2011 ◽  
Vol 226 (2) ◽  
pp. 267-278 ◽  
Author(s):  
A Mentella ◽  
M Strano
Keyword(s):  
Cross Section ◽  
Small Diameter ◽  
Rotary Draw Bending ◽  
The Cross ◽  
Draw Bending

Deformation Behaviors of Tube Rotary-Draw Bending Filled with Steel Balls

2011 ◽  
Vol 328-330 ◽  
pp. 1403-1407 ◽  
Author(s):  
Song Chao Shi ◽  
Lian Fa Yang ◽  
Chen Guo
Keyword(s):  
Cross Section ◽  
Wall Thickness ◽  
Rotary Draw Bending ◽  
Simulation Based ◽  
Bending Process ◽  
Deformation Behaviors ◽  
Draw Bending ◽  
Steel Balls ◽  
Internal Pressures

Wrinkling, wall thickness overthinning and cross-section distorting are main defects that seriously affect the forming quality of the tube in bending process. In this paper, numerical simulation based on PAM-STAMP 2G is conducted for the tube rotary-draw bending filled with steel balls as pressure transferring medium to analyze the deformation behaviors under various internal pressures. The results show that, tube bending filled with steel balls as pressure transferring medium can effectively restrain the defects of wrinkling and cross-section distorting. In addition, wrinkling and cross-section distorting of the bent tube decrease, the wall thickness thickening at the intrados of the bent tube decreases while the wall thickness thinning at the extrados increases with the internal pressure.

Characteristics of Rotary Draw-Bent Tubes for the Hydroforming

2011 ◽  
Vol 213 ◽  
pp. 320-324
Author(s):  
Byeong Don Joo ◽  
Jeong Hwan Jang ◽  
Hyun Jong Lee ◽  
Young Hoon Moon
Keyword(s):  
Cross Section ◽  
Structural Strength ◽  
Dimensional Accuracy ◽  
Thickness Variation ◽  
Important Process ◽  
Rotary Draw Bending ◽  
Higher Dimensional ◽  
Bending Process ◽  
Geometric Size ◽  
Draw Bending

Hydroformed parts have higher dimensional accuracy, structural strength, and dimensional repeatability. The pre-bending process is an important process for the successful hydroforming in the case where the perimeter of the blank is nearly the same as that of final product. At initial pre-bending stage, the variations of wall thickness and cross-section have effects on the accuracy of final products and quality. Because of a relatively excellent productive velocity, geometric size precision and reliance of product qualities, rotary draw bending is widely used. This study shows the bendability such as cross-section ovality, springback ratio and thickness variation in the various conditions of materials.

Comparison of different algorithms used for creating river terrain model based on the cross-sections.

2020 ◽  
Author(s):  
Luděk Bureš ◽  
Radek Roub ◽  
Petra Sychová
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Hydrodynamic Model ◽  
Linear Interpolation ◽  
Cross Sectional ◽  
Terrain Model ◽  
Model Based ◽  
Interpolation Techniques ◽  
The Cross

<p>Various techniques can be used to create a river terrain model. The most common technique uses 3D bathymetric points distributed across the main channel. The terrain model is then created using common interpolation techniques. The quality of this terrain depends on the number of the measured points and their location.</p><p>An alternative method may be an application of a set of cross-sections. Special interpolation algorithms are used for this purpose. These algorithms create new bathymetric points between two adjacent cross-sections that are located in a composite bathymetric network (CBN). Common interpolation techniques can be used to create a river terrain model. The advantage of this approach is a necessity of smaller dataset.</p><p>We present a comparison of four different algorithms for creating a river terrain model based on measured cross-sections. The first algorithm (A1) adopts a method of linear interpolation to create CBN [1]. The second algorithm (A2) reshapes the cross-sections and then applies linear interpolation. This reshaping allows better take into the account the thalweg line [2]. The third algorithm (A3) uses cross-sectional reshaping and uses cubic hermit splines to create CBN [3]. The last algorithm (A4)  implies the channel boundary and the thalweg line as additional inputs. Additional inputs define the shape of the newly created river channel [4].</p><p>Three different distances among individual cross-sections were used for the performance tests (50, 100 and 200 meters). The quality of topographic schematization and its impact on hydrodynamic model results were evaluated. Preliminary results show that there is almost no difference in the performance of the algorithms at cross-section distance of 50 m. The A4 algorithm outperforms/surpass its competitors in the case that input data (the cross-section distance is) are in 200 m spacing.</p><p>This research was supported by the Operational Programme Prague – Growth Pole of the Czech Republic, project No. CZ.07.1.02/0.0/0.0/17_049/0000842, Tools for effective and safe management of rainwater in Prague city – RainPRAGUE.</p><p>[1]       Vetter, M., Höfle, B., Mandelburger, G., Rutzinger, M. Estimating changes of riverine landscapes and riverbeds by using airborne LiDAR data and river cross-sections. Zeitschrift für Geomorphologie, Supplementary Issues, 2011, 55.2: 51-65.</p><p>[2]       Chen, W., Liu, W. Modeling the influence of river cross-section data on a river stage using a two-dimensional /three-dimensional hydrodynamic model. Water, 2017, 9.3: 203.</p><p>[3]       Caviedes-Voullième, D.; Morales-Hernández, M.; López-Marijuan, I.; García-Navarro, P. Reconstruction of 2D river beds by appropriate interpolation of 1D cross-sectional information for flood simulation. Environ. Model. Softw., 2014, 61, 206–228.</p><p>[4]       Merwade, V.; Cook, A.; Coonrod, J. GIS techniques for creating river terrain models for hydrodynamic modeling and flood inundation mapping. Environ. Model. Softw., 2008, 23, 1300–1311.</p>

scholarly journals Deformation of a cross section of 6063 alloy circular tube by rotary draw bending.

1994 ◽  
Vol 44 (9) ◽  
pp. 475-479 ◽  
Author(s):  
Minobu SUKIMOTO ◽  
Yuichi TAGUCHI ◽  
Masashi SAKAGUCHI ◽  
Hitoshi AKIYOSHI ◽  
Junichi ENDOU
Keyword(s):  
Cross Section ◽  
Circular Tube ◽  
Rotary Draw Bending ◽  
Draw Bending

The Research of Quantitative Analysis Methods on Product Form Information Based on the Cross-Section Diagram Set

2012 ◽  
Vol 229-231 ◽  
pp. 1675-1678
Author(s):  
Zhi Tang ◽  
Meng Ya Cai ◽  
Sheng Ze Wang ◽  
Bo Sun ◽  
Yue Ming Hao
Keyword(s):  
Cross Section ◽  
Morphological Characteristics ◽  
Product Form ◽  
Quality Of Data ◽  
The Cross ◽  
Change State ◽  
Machine Interaction ◽  
External Characteristics ◽  
Form Information

The external morphological characteristics of the handle grip impacts the man-machine interaction especially that of with fingers. Hence, the research on the external morphological of existed products has important significance on the improvement of man-machine interaction when designing a product. Most of the traditional ways of obtaining or describing product form information are established on a variety of views which do not consist the quality of data analysing dynamically or quantitatively. The aim of this article is exploring a new method based on the cross-section diagram set of the product. The method works in a more accurate way in obtaining the diagram information of product, meanwhile, it describes the change state of products' external characteristics by the simplex dimension of information. The method allows a dynamic and quantized way analysing the external characteristics of the product.

scholarly journals Characteristics of wool raw materials in the Southern Federal District

2020 ◽  
pp. 29-32
Author(s):  
Yu. A. Kolosov ◽  
V. V. Aboneev ◽  
A. M. Abdulmuslimov ◽  
A. S. Kiselev
Keyword(s):  
Cross Section ◽  
Raw Materials ◽  
Federal District ◽  
High Energy ◽  
International Standards ◽  
Climate Conditions ◽  
Merino Wool ◽  
The Cross ◽  
Strategic Program

Relevance. Sheep wool is one of the types of products that requires high energy costs of feed. Therefore, sheep breeding should be based in regions that allow for their soil and climate conditions to contain animals of this type with the lowest material costs. One of these regions of the Russian Federation is the southern Federal district. Assessment of the state of fine wool production in the region makes it possible to develop a science-based strategic program for managing this process, which can be universal and used in relation to other territories. This is the relevance of our research.Methods. Analytical, statistical, computational, and biometric research methods were used for their implementation.Results. As a result, it was found that there is currently a certain stagnation in the production of Merino wool in the Southern Federal District. Therefore, additional means of regional and federal support are needed to encourage producers to increase the number of sheep that produce uniform wool. Certification of wool based on methods consistent with international standards of the IWTO countries in this territory revealed a number of qualitative features of the raw materials produced. The largest share in the structure of produced wool — 79–93% — is occupied by raw materials with a diameter of the cross section of the fibers of 20.6–23.0 microns. Very insignificant is volume of wool diameter of the cross section of the fibers less than 20.5 microns — less than 1%. It is produced only in the Rostov region. It was also established that the share of wool with contamination by easily-and difficult-to-separate impurities at the level of 1.5–2% is from 38 to 100% of the produced wool in different regions of the district. The authors propose a system of complex selection and technological techniques to improve the quality of fine wool produced.

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