A Study on the Warm Forging-Flaring Process of Brass Tube

2014 ◽  
Vol 939 ◽  
pp. 524-529
Author(s):  
Chun Ho Liu ◽  
A Cheng Wang ◽  
Cheng Han Lee ◽  
You Min Huang
Keyword(s):  
Manufacturing Industry ◽  
Die Design ◽  
Stress Distributions ◽  
Working Process ◽  
Brass Tube ◽  
Warm Working ◽  
Forming Technology ◽  
Experimental Works ◽  
Warm Forging ◽  
Additional Value

At present, quite a lot of enterprises, small or medium-sized, are engaged in developing the various necessaries of livelihood. And, the forming processes are generally adopted for the methods of parts manufacture. Though various forming technology progress rather well, but the warm working process often cannot obtain fine finished products in the process of manufacturing. The warm working process still needs more adequate techniques. This study is focused on the analyzing of the warm forging-flaring process of brass tube, and the improving of the die design and the working procedures. In this paper, two sets of forging and flaring die are designed for experimental works. The results of simulation are compared with the experiments, the formability of brass tube showed a good agreement. Therefore, we suggest a multi-pass of forging process instead of single-pass process. The stress distributions and loading history in forming processes are also assessed in details. The method used in this study is available in the relative warm forming processes and die design. It is helpful to increase the additional value of products and promote the level of competition in manufacturing industry.

DEVELOPMENT OF A KNOWLEDGE-BASED INTELLIGENT CAD SYSTEM FOR AUTOMOTIVE PANEL DIE

2008 ◽  
Vol 07 (01) ◽  
pp. 51-54 ◽  
Author(s):  
HUI-XIA LIU ◽  
WEI WEI ◽  
XIAO WANG ◽  
LAN CAI
Keyword(s):  
Die Design ◽  
Design System ◽  
Working Process ◽  
Cad System ◽  
Knowledge Based ◽  
Working Principle ◽  
Panel Die ◽  
Automotive Panels ◽  
Automotive Panel

A knowledge-based intelligent die design system for automotive panels is developed by UG software platform. This system can accomplish design intelligently and automatically through engineering rules in the knowledge base. The framework and implementation of the system are discussed. Finally, a case study of the panel die design of car trunk in the system is implemented, which illustrates working process, working principle, implement method and practicability of the system, and validates the advanced design conception proposed in this paper.

Electric Connecting Piece Cutting Blanking Punching Compound Die Design

2013 ◽  
Vol 706-708 ◽  
pp. 1327-1330
Author(s):  
Hong Yun Jiang
Keyword(s):  
Spare Parts ◽  
Die Design ◽  
Working Process ◽  
Structure Feature ◽  
Stamping Process

It analyses the electric meeting slice parts stamping process, introduces all kinds of process’s feature and points out using the piece cutting blanking punching compound to form one time with the features of these spare parts. At the same time, it introduces the mold’s structure feature and the working process, and introduces the design of punch, bump mode, incision of the punch.

Precision Forming and Die Design for Octahedral Shell of Static Stents

2011 ◽  
Vol 117-119 ◽  
pp. 1646-1650
Author(s):  
Ting Liu ◽  
Xue Wen Chen ◽  
Shu Li Pei
Keyword(s):  
Die Design ◽  
Work Piece ◽  
Manufacturing Cost ◽  
Work Process ◽  
Optimization Analysis ◽  
Work Requirements ◽  
Simulation And Optimization ◽  
Forming Technology ◽  
Warm Extrusion

Static stents is the switch component that plays the role of fixing and supporting. It will received impact, the attrition and reverse function in the work process, which requires high mechanical properties to meet their work requirements. This paper uses the forming technology of "the pre-formation +warm extrusion + cold finishing "to form the static support ,and it carries on the numerical simulation and optimization analysis, which not only improve the work piece performance greatly and reduce the manufacturing cost.

Experimental modeling of fluid pressure in hydrostatic forming for cylindrical product

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040158
Author(s):  
Nguyen Thi Thu ◽  
Nguyen Dac Trung
Keyword(s):  
Fluid Pressure ◽  
Regression Function ◽  
Die Design ◽  
Design Calculation ◽  
Forming Process ◽  
Blank Holder ◽  
Forming Technology ◽  
Input Parameters ◽  
Function Relationship ◽  
And Control

Forming fluid pressure is an important technological parameter that determines whether a product can be accurately formed according to the size and profile of the die in hydrostatic forming technology. The expected value of this parameter is often very high because it acts as the punch in forming complex products from sheet metal. However, it is difficult to achieve high values because the forming fluid pressure depends on the ability to hold high pressure of equipment system and input parameters including the blank holder pressure, the depth of die, the thickness of workpiece. Moreover, it is also necessary to have a mathematical model for this parameter to facilitate the calculation and control of the forming process. In order to solve the above problems, this paper will indicate a simple way to avoid the pressure drop during forming process, and establish a regression function relationship between the forming fluid pressure for typical cylindrical product and input parameters above by experimental research method. The results contribute to die design, calculation and control of process parameters to facilitate shaping thin shell products in actual hydrostatic forming technology.

Introduction

1989 ◽  
Author(s):  
Shiro Kobayashi ◽  
Soo-Ik Oh ◽  
Taylan Altan
Keyword(s):  
Stress Distribution ◽  
Process Modeling ◽  
Slip Line ◽  
Metal Forming ◽  
Field Method ◽  
Stress Distributions ◽  
Line Field ◽  
Slip Line Field ◽  
Forming Technology ◽  
Computer Aided

In the late 1970s and early 1980s the use of computer-aided techniques (computer-aided engineering, design, and manufacturing) in the metal-forming industry increased considerably. The trend seems to be toward ever wider application of this technology for process simulation and process design. A goal in manufacturing research and development is to determine the optimum means of producing sound products. The optimization criteria may vary, depending on product requirements, but establishing an appropriate criterion requires thorough understanding of manufacturing processes. In metal-forming technology, proper design and control requires, among other things, the determination of deformation mechanics involved in the processes. Without the knowledge of the influences of variables such as friction conditions, material properties, and workpiece geometry on the process mechanics, it would not be possible to design the dies and the equipment adequately, or to predict and prevent the occurrence of defects. Thus, process modeling for computer simulation has been a major concern in modern metal-forming technology. Figure 1.1. indicates the role of process modeling in some detail. In the past a number of approximate methods of analysis have been developed and applied to various forming processes. The methods most well known are the slab method, the slip-line field method, the visioplasticity method, upper- (and lower-) bound techniques, Hill’s general method, and, more recently, the finite-element method (FEM). In the slab method, the workpiece being deformed is decomposed in several slabs. For each slab, simplifying assumptions are made mainly with respect to stress distributions. The resulting approximate equilibrium equations are solved with imposition of stress compatibility between slabs and boundary tractions. The final result is a reasonable load prediction with an approximate stress distribution. The slip-line field method is used in plane strain for perfectly plastic materials (constant yield stress) and uses the hyperbolic properties that the stress equations have in such cases. The construction of slip-line fields, although producing an “exact” stress distribution, is still quite limited in predicting results that give good correlations with experimental work. From the stress distributions, velocity fields can be calculated through plasticity equations.

Minimizing Stress Concentrations in the Femoral Heads of Hip Joint Prostheses: Effect of Borehole Shapes

2010 ◽  
Vol 443 ◽  
pp. 736-741
Author(s):  
Mohammad Sharif Uddin ◽  
Liang Chi Zhang
Keyword(s):  
Stress Concentration ◽  
Hip Joint ◽  
Manufacturing Industry ◽  
Contact Length ◽  
Stress Distributions ◽  
Mechanical Reliability ◽  
Stress Concentrations ◽  
Flat Bottom ◽  
Femoral Heads ◽  
Joint Prostheses

This paper presents a stress analysis of the ceramic femoral heads of hip joint prostheses with different borehole shapes to evaluate their mechanical reliability in terms of stress concentration. Under the ideal loading conditions used for ceramic rupture tests specified by the ISO 7206-5 standard, a finite element (FE) modeling is performed to determine the tensile and hoop stress distributions in the ceramic femoral heads. Two borehole shapes that are currently used in the manufacturing industry for hip joint prostheses, namely the flat bottom and keyhole, were first studied. Two new borehole shapes, dome arc and dome ellipse, were then introduced by the authors in the paper to minimize the stress concentration. It was found that while the currently used borehole shapes lead to high tensile notch stresses at their critical corners causing possible fracture failure of ceramic heads, the authors’ borehole designs can improve the mechanical reliability significantly. In addition, the effects of taper-bore contact length and their interface friction are investigated and discussed.

A Diehole Arranging Optimization Strategy in Multi-Hole Die Design for Profile Product Extrusion

2011 ◽  
Vol 201-203 ◽  
pp. 1548-1552
Author(s):  
Jin Biao Zhang ◽  
Jing Wen Wang ◽  
Zong Yin Duan
Keyword(s):  
Manufacturing Industry ◽  
High Efficiency ◽  
Extrusion Process ◽  
High Accuracy ◽  
Die Design ◽  
Optimization Strategy ◽  
Element Simulation ◽  
Key Factor ◽  
Optimized Model ◽  
Regression Theory

More and more attention is being paid to extrusion with multi-hole die in the manufacturing industry because of its advantages of high efficiency, high accuracy. However, there is a key factor that need to be taken into cosideration, such as diehole lacation on the multi-hole die. A optimization strategy integrated regression analysis for the multi-hole die design in profile extrusion process based on finite element simulation, GA, and regression theory was proposed, and an optimized model is established to predict the best location of diehole. A few examples show that the strategy is effective, feasible, and the model is accurate, applicable.

Simulation and Experiment of Cold Forging for Spur Gear Based on Local Loading

2011 ◽  
Vol 268-270 ◽  
pp. 241-246 ◽  
Author(s):  
Feng Xu ◽  
Ke Min Xue ◽  
Ping Li ◽  
Dong Mei Gong ◽  
Gang Chao Wang ◽  
...  
Keyword(s):  
Spur Gear ◽  
Cold Forging ◽  
Spur Gears ◽  
Stress Distributions ◽  
Local Loading ◽  
Forming Technology ◽  
Die Forging ◽  
Closed Die Forging ◽  
Simulation And Experiment ◽  
Physics Experiment

The cold closed-die forging of spur gears brings the problems of great forming forces , low life of the dies and insufficent corner filling. The two-step forming technology is presented. First, the billet is pre-forged by closed-die forging for getting most of tooth profile. Second, the gear is finish-forging by local loading. The finite element method is used to simulate the cold forging process.The strain distributions, the stress distributions, velocity distributions and load-stroke curve are investigated.. The simulation results show that the technology can guarantee the full filling effect, and decrease the forming force remarkably. The results of simulation and analysis were verified by the physics experiment.

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