Prediction of Dimensional Difference of Product from Tool in Cold Backward Extrusion

Ishikawa, Takashi; Yukawa, Natsuo; Yoshida, Yoshinori; Kim, H.; Tozawa, Yasuhisa

doi:10.1016/s0007-8506(07)62921-7

Cited by 34 publications

(16 citation statements)

References 2 publications

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“…Ishikawa, N. Yukawa,et,al, (T. Ishikawa, N. Yukawa, Y. Yoshida, H. Kim and Y. Tozawa, 2000) have discussed analytically the effects of forming stresses and generated heat on the dimensional change of punch die and work piece during forging. They have change in outer and inner diameter of backward extruded cup is investigated numerically using thermo-elastic-plastic FEM code according to the actual forging sequence, namely extruding, unloading of punch force, and ejection and air cooling of extruded cup.…”

Section: Cad/cae Used For Modeling and Analysismentioning

confidence: 99%

Modern Applied Science, Vol. 3, No. 3, March 2009, all in one file, Part B

MAS¹

2009

MAS

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Forest road construction for harvest operation are always been subjected to certain constrictions and limitations. Engineering practices on forest road alignment are hindered by costly environmental and operational assessment. GIS tools and related data such as remote sensing allows in allocating suitable access road by taking consideration of environmental and cost implication. The aim of this study is to present the method of integration of remote sensing data and GIS in allocating access road for forest harvesting using best path modeling. Therefore, the specific objectives of this study are to allocate the optimal forest roads network in forest operation, and to determine the density of forest road network. Allocating the best paths for forest road access for timber harvesting is a problem that can be solved by computer based approaches using spatial modeling. Spatial modeling is used to compute the indicative factors that suit road allocation. The model developed and designed using GIS to propose feasibility forest road allocation in the hill area. The method was designed to produce road layouts taking topographical features and forest environmental constraints into special consideration. In this study, four grid themes influencing the road construction were identified; elevation, slope, barrier of lake and distance to existing roads. The total of access road aligned and proposed in the respective area was 28,745.35m. Meanwhile the overall density calculated in selected compartments was about 9.93m/ha (0.80%). The densities of road paths presented here were achieved below as outlined by the forestry department. Thus, there is potential to reduce damage to the residual stand and to the ground area disturbance by the harvesting operation. The forest road alignment and information in this study provides an initial foundation on which GIS can be used for this kind of analysis in forest road planning. The result is not only associated with forest transportation, but at the same time is useful to identify a risk of road construction to the environment. This revealed that the minimum density of forest road construction can help mitigate the loss of ecological services of tropical forest subject to logging pressure and lead to greater financial benefit in future operations.

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Section: Cad/cae Used For Modeling and Analysismentioning

confidence: 99%

Modern Applied Science, Vol. 3, No. 3, March 2009, all in one file, Part B

MAS¹

2009

MAS

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“…Both parameters can be evaluated more precisely by implementing adequate FEM codes and knowing all influential parameters as presented by Ishikawa et al [4].…”

Section: Thermo-elastic Response Of the Systemmentioning

confidence: 99%

Comments on the cold metal forming processes stability control

Kuzman

2007

Journal of Materials Processing Technology

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“…The relationships between material model for die and workpiece and estimation accuracy of dimension for forged part have been studied in many papers [2][3][4][5][6][7][8]. The best results were given when the die was elastic and workpiece was elasto-plastic material.…”

Section: Fe Analysismentioning

confidence: 99%

“…Therefore, designer should fully recognise the elastic deformation of die and workpiece for eliminating the trial-and-error. Up to now, many studies for die-cavity compensation have been performed experimentally or numerically for the better die and process design [2][3][4][5][6][7][8][9]. Also, the closed-die upsetting has been studied by many researchers, because that it is the most frequently mode of cold forging and useful for analysing the elastic deformation of the whole cold forging system in detail [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%