Influence Rules of Technological Parameters on End Quality in Closed Cross Wedge Rolling (CWR)

2015 ◽  
Vol 1095 ◽  
pp. 756-761 ◽  
Author(s):  
Chuan Liu ◽  
Chang Shu ◽  
Cheng Chao ◽  
Bao Shou Sun
Keyword(s):  
Theoretical Foundation ◽  
Technological Parameters ◽  
Cross Wedge Rolling ◽  
Finite Element Software ◽  
Closed Type ◽  
Simulation Calculation ◽  
Reduction Of Area ◽  
Forming Angle ◽  
Deform 3D

In order to raise the efficience of materials' utilization and realize the CWR without the stub bar, this paper will focus on the closed CWR forming shafts,applying finite element software DEFORM-3D to do numerical simulation calculation for the process and studying the end quality of shafts.This paper has obtained the influence rule of the forming angle α, broadening angle β, reduction of area ψ and billet diameter D four process parameters on the end quality of the closed type CWR .The research results has showed that the length of concavity goes up along with the forming angle decrease;the same as the broadening angle; while the length of concavity goes up along with the billet diameter increase.and the reduction of area ψ has made a vital influence on the end quality of shafts,this conclusion has made a solid theoretical foundation and referential value for closed CWR .

Analysis of Stress and Strain on Shaft Parts for Closed Type of Cross Wedge Rolling during Stretching Stage

2015 ◽  
Vol 1095 ◽  
pp. 684-688
Author(s):  
Kai Yu Ji ◽  
Xue Dao Shu ◽  
Chao Cheng
Keyword(s):  
Engineering Application ◽  
Stress And Strain ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Finite Element Software ◽  
Closed Type ◽  
Theoretical Significance ◽  
Rolling Technology ◽  
Deform 3D

To improve the quality of shafts parts end in cross wedge rolling, this paper applied closed type of cross wedge rolling technology to form shaft parts. By using finite element software DEFORM-3D, simulation of forming process for closed type of cross wedge rolling was carried out. The distribution of the stress field and strain field during stretching stage is characterized as the metallic flowing of the rolling forming process. These results have great theoretical significance and engineering application value in the study of the generated mechanism of the end concavity for the closed type of cross wedge rolling and the improvement of the quality of rolled piece end.

Study on the Regularity of the Center Quality of Cross Wedge Rolling Asymmetric Shaft Parts Based on Parity Wedge

2014 ◽  
Vol 488-489 ◽  
pp. 1125-1129
Author(s):  
Xue Dao Shu ◽  
Wen Ping Liu ◽  
Chao Cheng ◽  
Zhan Li ◽  
Wen Fei Peng ◽  
...  
Keyword(s):  
Systematic Study ◽  
Theoretical Foundation ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Study Results ◽  
Technology Applications ◽  
Forming Angle ◽  
Core Part ◽  
Rolling Technology

In order to expand cross wedge rolling technology applications further and improving the quality of asymmetric shaft parts, this paper predicts the position of center defect location of Cross Wedge Rolling asymmetric shaft parts based on Parity Wedge by Normalized C & L criteria. On this basis, it conducted a systematic study on the effect of forming angle on quality of rolling core part. It has found that, during the forming process of Cross Wedge Rolling shaft parts, rolling center region was more prone to damage, and achieved the regularity of process parameters on the quality of core part. The study results lay the theoretical foundation for preventing defects effectively and improving quality of rolling core part.

Analysis on Temperature Field of Work-Piece during Cross Wedge Rolling

2011 ◽  
Vol 230-232 ◽  
pp. 352-356
Author(s):  
Wen Ke Liu ◽  
Kang Sheng Zhang ◽  
Zheng Huan Hu
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Metal Flow ◽  
Work Piece ◽  
Contact Deformation ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Rigid Plastic ◽  
Finite Element Software ◽  
Deform 3D

Based on the rigid-plastic deformation finite element method and the heat transfer theories, the forming process of cross wedge rolling was simulated with the finite element software DEFORM-3D. The temperature field of the rolled piece during the forming process was analyzed. The results show that the temperature gradient in the outer of the work-piece is sometimes very large and temperature near the contact deformation zone is the lowest while temperature near the center of the rolled-piece keeps relatively stable and even rises slightly. Research results provide a basis for further study on metal flow and accurate shaping of work-piece during cross wedge rolling.

The Research on the Microstructure Evolution Law of Cross Wedge Rolling Asymmetric Shaft-Parts Based on Parity Wedge

2012 ◽  
Vol 201-202 ◽  
pp. 1121-1125 ◽  
Author(s):  
Wen Wei Gong ◽  
Xue Dao Shu ◽  
Wen Fei Peng ◽  
Bao Shou Sun
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Microstructure Evolution ◽  
Theoretical Foundation ◽  
Effective Means ◽  
Element Model ◽  
Nonlinear Finite Element Method ◽  
Cross Wedge Rolling ◽  
Rigid Plastic ◽  
Simulation Calculation

Microstructure evolution is an effective means to improve the mechanical properties of products, shaft parts formed by cross wedge rolling is not only the shape of the formed parts, but more importantly it improves the comprehensive mechanical properties of the products by deformation. Therefore, the paper sets up the coupled rigid-plastic finite element model with deformation-heat transfer-microstructure by using nonlinear finite element method, and this model is adopted to make simulation calculation for the forming techniques of asymmetric shaft parts of cross wedge rolling based on parity wedge, specifically analyzes the rule of dynamic recrystallization and grain size distribution in the asymmetric rolled parts. The results show that the grain in the wedging place of asymmetric shaft parts of cross wedge rolling based on parity wedge can be obviously refined, and the research results of this paper may provide theoretical foundation for further improving the quality and mechanical properties of asymmetric shafts parts of cross wedge rolling.

Research of New Splitting Process of Pipe Billets from 2618A Aluminium Alloy Basing on Cross-Wedge Rolling

2013 ◽  
Vol 58 (3) ◽  
pp. 725-729 ◽  
Author(s):  
A. Tofil
Keyword(s):  
Aluminium Alloy ◽  
Experimental Research ◽  
Cross Wedge Rolling ◽  
Bending Angle ◽  
Precise Analysis ◽  
Rolling Method ◽  
Material Separation ◽  
Forming Angle ◽  
Splitting Process

Abstract This paper are presented the results of theoretical and experimental research on splitting without waste of pipe billets from aluminium alloy realized basing on cross-wedge rolling method. The analyzed process is connected with rolling of a V-shape groove on a split billet circumference, and later with rotary bending causing material separation. In theoretical analysis, based on simulations by means of finite element method, basic models of metal cracking (brittle and ductile) were applied. During calculations, the following process parameters were changed: forming angle α, bending angle θ and reduction ratio ∆r. The achieved results allowed for a precise analysis of the splitting process within the scope of: state of strain, kinematics of flow, force parameters, state of stresses and type of cracking of the split material. On the basis of experimental research, the influence of the analyzed parameters on the surface of splitting was estimated and scope of parameters guaranteeing the assumed quality of the product was given. The comparison of theoretical and experimental results showed good conformity.

Numerical Simulation of Cold Heading and Extruding for Spiral Bevel Gear

2010 ◽  
Vol 139-141 ◽  
pp. 1202-1205
Author(s):  
Ying Ying Chen ◽  
Wen Jie Feng ◽  
Ying Yang ◽  
Yong Du
Keyword(s):  
Bevel Gear ◽  
Forming Process ◽  
Rigid Plastic ◽  
Flow Process ◽  
Bevel Gears ◽  
Finite Element Software ◽  
Optimum Diameter ◽  
Spiral Bevel ◽  
Deform 3D

This paper develops an opened forging and divided flow process for spiral bevel gears. By the help of rigid-plastic finite-element software DEFORM-3D, this paper designed cold-extruding part and concave die for bevel gear in the rear running gear of tri-motorcycle and simulated the forming process of cold-heading and extruding. On condition of guaranteeing shaping quality of teeth, the optimum diameter of die porthole was made sure by analyzing the effect of porthole size on volume of billet and plastic force. The experiment results show that the design parameter is reasonable and simulation results are helpful to the design of die.

Numerical Simulation for Thick-Walled Hollow Axle during Cross Wedge Rolling

2011 ◽  
Vol 337 ◽  
pp. 270-273 ◽  
Author(s):  
Yang Jiang ◽  
Bao Yu Wang ◽  
Zheng Huan Hu ◽  
Jian Guo Lin
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Rolling Process ◽  
Cross Wedge Rolling ◽  
Finite Element Software ◽  
Temperature Distributions ◽  
Simulation Results ◽  
Deform 3D

The paper investigates a process of cross wedged rolling (CWR) for manufacturing thick-walled hollow axles. A finite element numerical model coupled deformation and heat transfer of CWR is established using commercial finite element software DEFORM-3D. The rolling process of hollow axle during CWR is simulated successfully. The stress, strain and temperature distributions of workpiece are obtained and analyzed. The simulation results show that forming thick-walled hollow axles through CWR is feasible.

Analysis of Square Billet Cross Wedge Rolling Process Using Finite Element Method

2012 ◽  
Vol 271-272 ◽  
pp. 406-411 ◽  
Author(s):  
Wen Yu Ma ◽  
Bao Yu Wang ◽  
Jing Zhou ◽  
Qiao Yun Li
Keyword(s):  
Finite Element ◽  
Rolling Force ◽  
Element Model ◽  
Rolling Process ◽  
Simulation Software ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Radial Forces ◽  
Forming Angle ◽  
Deform 3D

The aim of this paper is to determine whether the train axle cross wedge rolling(CWR) using square billet as blank is available or not. Based on numerical simulation software DEFORM-3D, we built the finite element model. And the whole forming process was simulated successfully. The stress and strain distributions of workpiece in the process were analyzed. The effect of forming angle, stretching angle and billet size on rolling force was investigated, then determined the proper process parameters. The differences between the round billet rolling and the square billet rolling were obtained by comparing the tangential, axial and radial forces during the rolling process. The studied results show the availability of using square billet as blank in train axle CWR and provide important realistic meaning and application value.

Effect of rolling parameters on forming quality of flat cross wedge rolling thread shafts

2020 ◽  
pp. 095440892095259 ◽  
Author(s):  
YiYu Shao ◽  
WenFei Peng ◽  
Xuan Yu ◽  
Moliar Oleksandr ◽  
Vyacheslav Titov
Keyword(s):  
Axial Force ◽  
Element Model ◽  
Helix Angle ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Forming Quality ◽  
Rolling Parameter ◽  
The Right ◽  
Forming Angle

The flat cross wedge rolling is an advanced forming process, which is used to produce thread shafts. In this work, a finite element model of flat cross wedge rolling thread shafts was established by the DEFORM-3D, and the effect of the forming angle, spreading angle, helix angle and flank angle on forming quality are investigated. The research results show that the forming angle, spreading angle, helix angle have a significant influence on the position of the die wedge-in point. The angle designed wrongly makes the die wedge-in point unable to be aligned correctly, causing defects such as slipping in the process, repeated rolling of formed thread, thin or incomplete tooth shapes. The flank angle mainly makes an impact on the axial force. Reducing the right flank angle or increasing the left flank angle can effectively improve the imbalance of axial force to obtain high-quality thread shafts. Through the experiment of flat cross wedge rolling thread shafts, the data comparison demonstrates that the error of the external dimension of formed parts is small, proving the reliability of the rolling parameter selection.

Effect of Blank Shape and Size on the Forming Quality of Thread Shaft Rolling in Cross Wedge Rolling

2013 ◽  
Vol 853 ◽  
pp. 605-609
Author(s):  
Hua Jun Yan ◽  
Hao En Mao ◽  
Guo Chang Li ◽  
Xiao Xi He ◽  
Jin Ping Liu ◽  
...  
Keyword(s):  
Theoretical Foundation ◽  
Size Range ◽  
Good Precision ◽  
Cross Wedge Rolling ◽  
Depth Study ◽  
Rolling Experiment ◽  
Blank Shape ◽  
Shape And Size ◽  
Made In

The defects of the lower tooth height and of larger pitch in thread portion of rolled pieces are prone to appearing when rolling thread shaft in cross wedge rolling. To solve this problem, changing the blank shape and size were tried. Two types of concave conical and round blanks are designed with concave conical blanks obtained by rolling in the cross wedge rolling. Because the design of the rolling die is simple, good precision of blank can be ensured. Multiple size types of blanks were designed and the rolling experiment was made in the rolling mill of model H630. By measuring the values of the tooth height and pitch, the effect of blank shape on thread shafts rolled in the wedge rolling were investigated carefully. The reasonable size range of the blank shape was obtained. The conclusions above pave the theoretical foundation for the in-depth study on this technology.

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