Three-dimensional free bending is a new tube forming technology with continuous variable curvature. In order to improve the quality of tube, this paper studies principle three-dimensional system and numerical calculation moment in detail, it uses finite element simulation model mechanism process. The used simulate process copper influence key parameters on analyzed,the shape inner cavity die ga...

Quantitative indicators of the tax burden used in political discussions, quite often do not prove very reliable for two reasons; either they are rather crude summary measures or they are rather selectivly chosen benchmark tax load figures. A natural way to improve the situation is to introduce an index number concept. The paper deals with index numbers for commodity taxes first. Fix weight comm...

scape bending disorder is the most important factor affecting postharvest loss of gerbera cut flowers. one of the ultimate reasons for gerbera stem bending is lignin, with deformation structural functions and defensive mechanisms. this postharvest experiment was conducted to evaluate the role of phenylalanine ammonia lyase (pal) and peroxidase (pod) enzymes activity in stem bending of two gerbe...

Sheet metal forming die technologies show great progress in the industry daily. dies design depends on many parameters such as product's geometry, dimensions to be designed, number of products, and part operation. The main purpose designs is with optimum obtain high-quality products.One reasons for these errors damage elements during This studyanalyzed final process sheet using a progressive tw...

An Al2O3/5 vol%·ZrO2/5 vol%·Y3Al5O12 (YAG) tri-phase composite was manufactured by surface modification of an alumina powder with inorganic precursors of the second phases. The bulk materials were produced by die-pressing and pressureless sintering at 1500 °C, obtaining fully dense, homogenous samples, with ultra-fine ZrO2 and YAG grains dispersed in a sub-micronic alumina matrix. The high temp...

Bending angle obtained in laser forming process is much smaller than that conventional die pressing or roller bending processes. Therefore, multi-stage necessary to form deep drawn shapes and/or complex by forming. However, irradiation varies material properties, posture, and stiffness of metal plates, those influences are accumulated during the consecutive stages process. Thus, thermo-elasto-p...

Four-roll bending process is usually used for manufacturing of seamed thick-walled and thin-walled cylinders. Due to complexity of this process, the analytical solution of plate bending in this process has not been developed completely. The existence of friction and multi-step processing makes it more difficult. Investigation of four-roll bending process using analytical and numerical methods i...

Rectangular waveguide is one of the earliest types of transmission lines. Rectangular waveguide can be produced by hot extrusion process. In this paper, the hot extrusion process of CuZn5 rectangular waveguide was investigated by Finite Element Method (FEM). In addition, Genetic Algorithm (GA) was used to optimize the die geometry and process conditions to achieve the lowest magnitude of extrus...

In any metal forming process, both the strain rate and deformation rate depend on the die profile. The die profile also, is responsible for the non-uniformity of the deformation along the cross-section. These affect the quality and mechanical properties of the product. Therefore, if a die is designed, in which the affecting variables can be controlled spontaneously it is hoped to obtain a produ...

Abstract A non-destructive diagnostic method based on deflection analysis for monitoring the post-elastic response of beams was developed, and a indicator proposed. The defined as second moment normalised curvature function about mid-span, where computed from function. Elastic reference values were simply supported under uniformly distributed load, three-point, four-point bending. Development p...