Application of Viscous Pressure Forming in Aeronautics and Astronautics

2014 ◽  
Vol 989-994 ◽  
pp. 3306-3309
Author(s):  
Ji Guang Li ◽  
Jie Gang Zhang ◽  
Jing Ping Liu ◽  
Rui Feng Zhao ◽  
Yang Li ◽  
...  
Keyword(s):  
Basic Principle ◽  
High Strength ◽  
Thin Wall ◽  
Forming Process ◽  
Variable Diameter ◽  
Thin Walled ◽  
Viscous Pressure ◽  
Viscous Pressure Forming ◽  
Thin Wall Part ◽  
Super Alloy

Viscous pressure forming (VPF) is a new developed sheet soft-punch forming process in 1900s. The basic principle and characteristics of VPF are described. The applications of VPF technologies of nickel-based super-alloy corrugated thin-walled part, asymmetrical thin-wall part with variable diameter, super-alloy thin-walled part with variable diameters, corrugated thin-walled part with larger diameter and small section are presented. The results show that VPF is suitable for the forming of parts with high strength, low plasticity, super thin-wall and complex shaped.

Research on Multi-Steps Tube-Compression of Thin-Wall Parts with Variable Diameter by Viscous Pressure Forming

2011 ◽  
Vol 264-265 ◽  
pp. 260-265
Author(s):  
Zhong Jin Wang ◽  
Ji Guang Li ◽  
Hai Lan Gong
Keyword(s):  
Small Deformation ◽  
High Strength ◽  
Reduction Ratio ◽  
Thin Wall ◽  
Compression Process ◽  
Variable Diameter ◽  
Ratio Limit ◽  
Viscous Pressure ◽  
Diameter Reduction ◽  
Viscous Pressure Forming

Tube-compression is one of the usual forming methods for variable diameter parts. Due to the influence of compression instability, buckling and wrinkling are prone to occur in tube-compression process, especially for the thin-wall parts, which restricts the diameter reduction ratio limit. In this paper, the viscous pressure forming (VPF) method is proposed for the problems in tube-compression. Utilizing the mechanical property and easily achieved loading mode of viscous medium, the buckling in the tube-compression process can be delayed and wrinkles caused by buckling can be eliminated, so as to increase the diameter reduction ratio limit. The multi-steps forming can divide the large total deformation into much small deformation, thus the small deformation can be controlled in the range of buckling and wrinkling. The process has the more ability to improve material’s forming capability than one-step forming. The deformation of the multi-steps tube-compression process by VPF is analyzed by finite element method (FEM). The variation of length-to-diameter and wall thickness after each step forming has influence on the next step compression. This forming method can also be used in tube-compression of high strength materials and can realize precise plastic forming of parts with high strength, thin-wall and large diameter variation ratio.

Numerical Simulation and Process Analysis for Injection Forming about the Thin-Wall Conical Centrifugal Disc

2014 ◽  
Vol 941-944 ◽  
pp. 2298-2304
Author(s):  
Jian Hua Zhou ◽  
Li Guo Liu ◽  
Xue Ming He
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Glass Fiber ◽  
Fiber Orientation ◽  
Process Analysis ◽  
Centrifugal Separation ◽  
Thin Wall ◽  
Forming Process ◽  
Thin Wall Part

A numerical simulation mathematical model and sloved method about injection forming for thin-wall part was established. Based on it, Simulation of the injection forming process of centrifugal separation disc. Through the simulation of forming process for PA66 and PA66+30%GF two kinds of materials, realized the injection forming for centrifugal separation disc using PA66+30%GF. Through the anisotropy of glass fiber orientation, improve the stiffness and toughness for centrifugal disc.

Investigation into Influence of Pre-Forming Depth on Multi-Stage Hydrodynamic Deep Drawing of Thin-Wall Cups with Stepped Geometries

2012 ◽  
Vol 457-458 ◽  
pp. 1219-1222 ◽  
Author(s):  
Yu Zhu ◽  
Min Wan ◽  
Ying Ke Zhou ◽  
Qing Hai Liu ◽  
Nan Song Zheng ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Failure Modes ◽  
Thickness Distribution ◽  
Steel Part ◽  
Drawing Ratio ◽  
Thin Wall ◽  
Forming Process ◽  
Hydrodynamic Deep Drawing ◽  
Multi Stage ◽  
Thin Walled

Hydrodynamic deep drawing (HDD) is an effective method for manufacturing complicated and thin-walled parts. Aiming at the forming process of the stainless steel part with 0.4 mm thick and complex stepped geometries, the technology scheme of multi-stage HDD assisted by conventional deep drawing (CDD) is proposed in consideration of wrinkling and destabilization in the unsupported region of the conical wall, and finite element models are built. As a key process parameter, pre-forming depth on the quality of the parts is explored with assistance of numerical simulations and verification experiments. Furthermore, the failure modes, including wrinkling and fracture during forming process are discussed; meanwhile, the optimum pre-forming depth is realized. The results indicate that the technological method is proven to be feasible for integral forming of thin-walled parts with a large drawing ratio and stepped geometries; moreover, the parts with uniform thickness distribution and high quality are successfully formed by adopting optimum pre-forming depth.

Bulk-Sheet Forming Process for Products with Thin Wall and Thick Rim

2013 ◽  
Vol 389 ◽  
pp. 273-276
Author(s):  
K.H. Jung ◽  
H.C. Lee ◽  
S. Lee ◽  
E.Z. Kim ◽  
Jung Han Song
Keyword(s):  
Numerical Analysis ◽  
Process Design ◽  
Sheet Forming ◽  
Thin Wall ◽  
Forming Process ◽  
Forging Process ◽  
Backward Extrusion ◽  
One Stage ◽  
Thin Walled

In this study, a novel process to forge thin walled products using bulk-sheet forming concept is developed to overcome drawbacks of a conventional multistage backward extrusion. A newly developed process design is suggested based on numerical analysis, and feasibility of one-stage forging process is discussed.

Research on Formability of Aluminum Alloy 2024 Sheet by Viscous Pressure Forming

2013 ◽  
Vol 634-638 ◽  
pp. 2872-2876 ◽  
Author(s):  
Tie Jun Gao ◽  
Yao Wang ◽  
Jian Guang Liu ◽  
Zhong Jin Wang
Keyword(s):  
Aluminum Alloy ◽  
Pressure Field ◽  
Thickness Distribution ◽  
Viscous Medium ◽  
High Rate ◽  
Forming Process ◽  
Aluminum Alloy 2024 ◽  
Viscous Pressure ◽  
Flexible Die ◽  
Viscous Pressure Forming

Viscous pressure forming(VPF) using a semi-solid, flowable, highly viscous and certain rate sensitive macromolecule polymer as the forming flexible-die is a good forming method for high strength, low plasticity, complex sheet metal parts. In this paper, the bulging process of aluminum alloy 2024 sheet is carried out by combining methods of experiments with numerical simulation. Influences of viscous medium properties on the geometry of bulging specimens, thickness distribution and the pressure field of viscous medium are analyzed, and the limit bulging heights of aluminum alloy 2024 sheets are obtained. The research results show that choosing viscous medium with high rate sensitivity in the forming process can increase the non-uniformity of viscous pressure field, improve the viscous pressure bulging property of aluminum alloy 2024 sheet, and ameliorate the distribution uniformity of wall thickness of bulging specimens.

scholarly journals Research of the wrinkling elimination of stainless steel SUS304 by viscous pressure

2019 ◽  
Vol 39 (2) ◽  
pp. 141-147
Author(s):  
Tiejun Gao ◽  
Xiaojun Liu ◽  
Hepeng Zhang ◽  
Kun Yu
Keyword(s):  
Stainless Steel ◽  
Sheet Metal ◽  
Evaluation Method ◽  
Elimination Rate ◽  
Viscous Medium ◽  
Forming Process ◽  
Forming Precision ◽  
Viscous Pressure ◽  
Buckling Test ◽  
Viscous Pressure Forming

Wrinkling is one of the most important factors influencing a forming precision of sheet metal, which brings difficulties to the forming process of sheet metal. In order to eliminate the wrinkling during the forming process, an accurate prediction is necessary. In this paper, the wrinkling elimination process was investigated based on the principle of the Yoshida Buckling Test (YBT) and viscous pressure forming. The experimental device was designed, and evaluation method of the wrinkling elimination rate was presented by the stainless steel SUS304. On this basis, the wrinkling elimination experiment was carried out, the influences of both the viscous medium molecular weight and the tensile state of wrinkle under the viscous pressure on the wrinkling elimination were obtained.

ATLANTIC 13B ALLOY

Alloy Digest ◽  
1976 ◽  
Vol 25 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Silicon Bronze ◽  
Thin Walled ◽  
Engineering Corporation ◽  
Bronze Casting

Abstract ATLANTIC 13B Alloy is a silicon bronze casting alloy offering excellent castability and corrosion resistance, good machinability and medium-high strength. It is an all-purpose alloy that is suitable for gears, valve parts and marine fittings. It is especially useful in stress-corrosion environments for thin-walled parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-307. Producer or source: Atlantic Casting and Engineering Corporation.

Sign in / Sign up

Export Citation Format

Share Document