Study on Spinning of Pentagonal Cross-Section Hollow-Part Based on Orthogonal Experiment Design

2011 ◽  
Vol 314-316 ◽  
pp. 783-788 ◽  
Author(s):  
Qin Xiang Xia ◽  
Ying Pin Wang ◽  
Ning Yuan ◽  
Xiu Quan Cheng
Keyword(s):  
Feed Rate ◽  
Thickness Distribution ◽  
Reduction Ratio ◽  
Test Method ◽  
Relative Height ◽  
Forming Quality ◽  
Maximum Reduction ◽  
Fea Simulation ◽  
Hollow Part ◽  
Spinning Force

The investigation of the effect of processing parameters on forming quality has been one of the highlight researches in spinning. The thickness distribution is an important criterion to evaluate the forming quality. Spinning force affects the processing and equipment design greatly. Combining with the FEA simulation and orthogonal test method, taking the maximum reduction ratio in thickness of workpiece and the maximum spinning force as the evaluation criterion, the esequence of the main forming parameters, such as the feed rate and roundness radius of roller, and the relative height of workpiece were analyzed based on an orthogonal scheme of three-factor and three-level. Both FEA simulation and experiment results show that, during the pentagonal section hollow-part spinning, the influence sequence on the maximum reduction ratio in thickness is relative height of workpiece, feed rate and roundness radius of roller; the influence sequence on the maximum spinning force is relative height of workpiece, roundness radius of roller and feed rate.

A Study of Wall Ironing by the Finite Element Technique

1978 ◽  
Vol 100 (1) ◽  
pp. 31-36 ◽  
Author(s):  
E. I. Odell
Keyword(s):  
Finite Element ◽  
Lower Bound ◽  
Cone Angle ◽  
Reduction Ratio ◽  
Operating Parameters ◽  
Finite Element Technique ◽  
Elastic Plastic ◽  
Maximum Reduction ◽  
Load Displacement ◽  
Element Technique

Wall ironing has been analyzed using an elastic-plastic finite element technique. The effects that the ironing ring semi-cone angle and friction have on the maximum reduction ratio are studied in detail. Stress contours are given for a typical set of operating parameters. Several ram load/displacement curves are provided and compared with upper and lower bound loads.

scholarly journals Simulation of incremental forming processes of a pyramidal ring made of two materials

2018 ◽  
Vol 19 (3) ◽  
pp. 313
Author(s):  
Masood Ghassabi ◽  
Milad Salimi ◽  
Mohammad Haghpanahi
Keyword(s):  
Feed Rate ◽  
Rotational Speed ◽  
Incremental Forming ◽  
Thickness Distribution ◽  
Single Point ◽  
Dimensional Accuracy ◽  
Cnc Machine ◽  
Forming Force ◽  
Forming Process ◽  
Dimensional Precision

Incremental forming is one of the most well-known forming processes for complex and asymmetric parts. This method uses a CNC machine, simple forming tool, and a die. This study focused on effects of some parameters such as the material, feed rate, pitch, rotational speed and movement strategy of tool on the dimensional precision, forming force, thickness distribution and fracture in the welding area. The results showed that single point incremental forming (SPIF) led to a better thickness distribution with lower tool force, whereas two-point incremental forming led to better dimensional accuracy. Rotational speed does not have any significant impact on the forming process while decreasing the feed rate partially reduced the forming force. According to the results, although dimensional precision in double point incremental forming is better than SPIF, when it comes to the thickness distribution, forming force, and economic issues, SPIF is in favor. The results also showed that by connecting two materials, different parameters for the two materials could be investigated simultaneously in one simulation process.

Numerical and Experimental Analysis of Attaching-Mandrel Process Under Multi-Pass Cold Spinning Process on Superalloy GH3030

2019 ◽  
Author(s):  
Li Zixuan ◽  
Shu Xuedao ◽  
Cen Zewei ◽  
Zhang Song
Keyword(s):  
Production Efficiency ◽  
Thickness Distribution ◽  
Grain Structure ◽  
Combination Method ◽  
Nickel Base Superalloy ◽  
Forming Quality ◽  
Spinning Process ◽  
Conventional Spinning ◽  
Hot Spinning Process ◽  
Nickel Base

Abstract The superalloy products formed by multi-pass conventional spinning are widely used in rotary forming parts with complex shapes. As the connection of each forming pass, the attaching-mandrel process has an important influence on forming quality and production efficiency. The hot spinning process is usually adopted in superalloy forming because its poor plasticity in normal temperature, meanwhile, it brings the poor surface quality of the parts and huge energy consumption. For this reason, the cold spinning and the attaching-mandrel process of nickel-base superalloy GH3030 are studied. The combination method of experiment and simulation is used to study the attaching-mandrel process based on one-forward-pass spinning process. The effects of pass pitch and the attaching-mandrel velocity on the tool forces, parts stress field, strain field and wall thickness distribution are analyzed. The microstructure of the part is divided into three layers: outer, middle and inner layer. The grain size of each layer is compared. Then the effect of different pass pitch on the grain structure is clarified. The results show that the reasonable pass pitch and the attaching-mandrel velocity can improve the forming quality and production efficiency. The multi-pass cold spinning process on superalloy GH3030 is feasible. The excessive pass pitch can cause seriously grain elongation, the grain boundaries are blurred, and even cracking.

Simulation of Shear Spinning Process for Pressure Vessel Components

2007 ◽  
Author(s):  
Jian-Hua Zhao ◽  
Henri Champliaud ◽  
Thien-My Dao
Keyword(s):  
Deformation Behaviour ◽  
Thickness Distribution ◽  
Shell Element ◽  
Die Design ◽  
Fe Model ◽  
Proposed Model ◽  
Spinning Process ◽  
Deformation Force ◽  
Spinning Force ◽  
Shear Spinning

Spinning process for the medium- and small-lot production of axisymmetric components has many advantages, such as smaller deformation force, simpler tool-and-die design, and lower investment in equipment, over conventional forming processes. It has been widely used in aerospace, energy and defense industry. This paper presents a 3-D elastoplastic finite element (FE) model for the simulation of the shear spinning process, in order to study deformation behaviour and design proper process parameters for the spinning process. The proposed model has the following characteristics: i) a shell element is used to mesh the contact pairs between the workpiece (a metal blank) and the tool sets (a pressing roller and a mandrel); ii) the offset thickness of the shell element is considered during contact treatment; iii) the movement of the roller and the fixing of the central blank and mandrel are treated as the boundary condition; iv) relative movement between the roller and the blank is treated as a spiral feeding process. FEM simulations for shear spinning with aluminum have been implemented, using a dynamic explicit scheme, on ANSYS/LS-DYNA software. Spinning force, thickness distribution and stress distribution have been studied under various roller feeds and inclined angles of mandrel. The simulation results have provided good confirmation with the experiments.

scholarly journals Experimental investigation of specific heat of aqueous graphene oxide Al2O3 hybrid nanofluid

2019 ◽  
pp. 381-381 ◽  
Author(s):  
Yuguo Gao ◽  
Yangyang Xi ◽  
Yang Zhenzhong ◽  
Agus Sasmito ◽  
Arun Mujumdar ◽  
...  
Keyword(s):  
Experimental Data ◽  
Specific Heat ◽  
Mass Fraction ◽  
Reduction Ratio ◽  
Hybrid Nanofluid ◽  
Maximum Reduction ◽  
Cooling Method ◽  
Hybrid Nanofluids ◽  
Lower Temperature ◽  
Temperature Impacts

The specific heat of aqueous graphene+Al2O3(1:1)hybrid nanofluid was measured using the cooling method. The influence of nanoparticle mass fraction and temperature on the specific heat capacity of the hybrid nanofluids was investigated, the specific heat of the hybrid nanofluid was compared with that of aqueous grapheneoxide nanofluidand Al2O3nanofluid. Afitted formula of the specific heat of the hybrid nanofluid was proposed based on the experimental data. It indicates that the specific heat reduction ratio increases with increase of nanoparticle fraction; the maximum reduction ratio is 7% at 0.15wt% at 20?C. The mass fraction of nanoparticle affects the specific heat of hybrid nanofluid more significantly at lower temperature. Temperature impacts the specific heat more distinctly than the nanoparticle fraction. The specific heat increases with temperature and the maximum specific heat reduction ratio of the hybrid nanofluid diminishes from 7 % at 20?C to 2% at 70?C at the mass fraction of 0.05%.

The Influence of SiC Particles on Tool Wear in Machining of Al/SiC Metal Matrix Composites Produced by Powder Extrusion

2011 ◽  
Vol 325 ◽  
pp. 393-399 ◽  
Author(s):  
R. Yousefi ◽  
M.A. Kouchakzadeh ◽  
J. Rahiminasab ◽  
M.A. Kadivar
Keyword(s):  
Tool Wear ◽  
Metal Matrix Composites ◽  
Feed Rate ◽  
Metal Matrix ◽  
Cutting Speed ◽  
Test Method ◽  
Engineering Properties ◽  
Depth Of Cut ◽  
Matrix Composites ◽  
Sic Particles

Metal matrix composites (MMCs) have received considerable attention due to their excellent engineering properties. However, poor machinability has been the main deterrent to their substitution for metal parts. The hardness and abrasive nature of reinforcement phase causes rapid tool wear during machining which results in high machining costs. In this study, the effect of SiC particles (5, 15 & 20 percent) on tool wear in turning process is experimentally investigated. Continuous dry turning of Al/SiC particulate metal matrix composite produced by powder metallurgy and utilizing titanium carbide inserts has been achieved as the test method. The influence of machining parameters, e.g. cutting speed, feed rate and depth of cut on tool wear and cutting forces were investigated during the experiments. The results show that tool wear increases with increasing cutting speed, depth of cut and feed rate. The cutting speed and depth of cut are more dominant factors compared to feed rate on the tool wear. In addition, it is concluded that the flank wear increases with the increase of SiC percentage in the MMC.

scholarly journals Model Study on the Combination of Operating Parameters of Corn Kernel Harvesters

2021 ◽  
Vol 11 (21) ◽  
pp. 10328
Author(s):  
Deyi Zhou ◽  
Chongbin Xu ◽  
Yuelin Xin ◽  
Pengfei Hou ◽  
Baoguang Wu ◽  
...  
Keyword(s):  
Feed Rate ◽  
Loss Rate ◽  
Field Experiments ◽  
Influencing Factor ◽  
Linear Optimization ◽  
Test Method ◽  
Operating Parameters ◽  
Corn Kernel ◽  
Speed Variation ◽  
Variation Rate

This study analyzed the engine operating condition curve of the corn kernel harvester. Field experiments identified the feed rate, concave clearance, and cylinder speed as the main factors affecting operating quality and efficiency. A ternary quadratic regression orthogonal center-of-rotation combined optimization test method was used to determine the feed rate, cylinder speed, and concave clearance as the influencing factors, and the engine speed variation rate, crushing rate, impurity rate, loss rate, and cylinder speed variation rate as the objective functions. A mathematical regression model was developed for the combination of operating quality indicators, efficiency indicators, and operating parameters of the corn kernel harvester. A non-linear optimization method was used to optimize the parameters of each influencing factor. The results showed that with a feed rate of 12 kg/s, a forward speed of 5 km/h, a cylinder speed of 360 r/min, and a concave clearance of 30 mm, the average crushing rate was 3.91%, the average impurity rate was 1.71%, and the kernel loss rate was 3.1%. This model could be used for the design and development of intelligent control systems.

Research on Surface Roughness of Ultrasonic Polishing without Abrasive Based on Orthogonal Experiments

2009 ◽  
Vol 416 ◽  
pp. 133-136
Author(s):  
Jian Jun Jiang ◽  
Jian Xin Zheng ◽  
Chuan Shao Liu
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Lower Surface ◽  
Orthogonal Test ◽  
Test Method ◽  
Experimental Results ◽  
Polished Surface ◽  
Orthogonal Experiments ◽  
Orthogonal Test Method ◽  
Conventional Rolling

Experiments of ultrasonic polishing the 45# steel shaft without abrasive are carried out by using orthogonal test method to study the polished surface roughness, and experimental results are analyzed with range method. The influence of polishing parameters on the polished surface roughness could be arranged as follows: feed rate, power of generator, preload pressure and radius of the tool head, in which the feed rate brings the most remarkable influence on the polished surface roughness. The surface roughness value reduces at first and then increases when the radius of tool head, preload pressure and power of the generator increase. The surface roughness value increases with the feed rate. Comparative experimental results of ultrasonic polishing without abrasive and the conventional rolling indicate that lower surface roughness value may be obtained by ultrasonic polishing without abrasive.

Axial Force Test and Analysis in Riveting Assembly of Automotive Hub Bearing Unit

2012 ◽  
Vol 268-270 ◽  
pp. 1058-1062 ◽  
Author(s):  
Yun Ya Xiao ◽  
Zhi Xiong Zhou ◽  
Wei Li ◽  
Guo Fei Meng
Keyword(s):  
Axial Force ◽  
Feed Rate ◽  
Test Method ◽  
Motion Trajectory ◽  
Test Results ◽  
Bearing Unit ◽  
Improvement Measures

A test method for riveting assembly force, used in hub bearing unit assembly, was present in this study. Based on the test results, the influences of motion trajectory of rivet head, structure of rivet machine and feed rate of rivet head on axial force were analyzed. The corresponding improvement measures were proposed.

Research on Strong Spinning Process of GH4169 Alloy

2020 ◽  
Vol 993 ◽  
pp. 68-78
Author(s):  
Hai Bao Wu ◽  
Ji Zhen Li ◽  
De Gui Liu ◽  
Jun Sheng Liu
Keyword(s):  
Feed Rate ◽  
High Performance ◽  
Basic Research ◽  
Alloy Sheet ◽  
Test Method ◽  
Forming Process ◽  
Process Guidance ◽  
Spinning Process ◽  
Thinning Rate ◽  
Gh4169 Alloy

In this paper, the basic technology of spin forming process was carried out on the GH4169 alloy sheet by heating and strong spinning. The spheroidal spinability test method was used to study the spinability of the alloy. The effects of the strong spinning process parameters on the ultimate thinning rate, diameter expansion and fracture behavior of GH4169 alloy were analyzed. The research results showed that when the temperature was higher than 800 °C, the ultimate thinning rate of GH4169 alloy was above 80%. At the same time, with the increase of feed rate, the ultimate thinning rate of GH4169 alloy decreased. When the feed rate of the rotary wheel was lower than 200 mm•min-1, the ultimate thinning rate of GH4169 alloy was maintained above 80%. The radius of rotary wheel was strongly influence GH4169 alloy ductility which was confirmed by the picture of fracture. This basic research provides the experimental basis and process guidance for the practical use of GH4169 and other high-temperature alloy sheets to produce high-precision and high-performance spinning parts, which has significant application value.

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