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.

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 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.

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.

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.

scholarly journals Study on Near-Net Forming Technology for Stepped Shaft by Cross-Wedge Rolling Based on Variable Cone Angle Billets

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1278 ◽  
Author(s):  
Sutao Han ◽  
Xuedao Shu ◽  
Chang Shu
Keyword(s):  
Finite Element ◽  
Cone Angle ◽  
Rolling Process ◽  
Wave Mode ◽  
Shape Parameters ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Finite Element Software ◽  
Stepped Shaft

Considering problems about concaves at the stepped shaft ends, this paper established the plastic flow kinetic theories about metal deforming during the cross-wedge rolling (CWR) process. By means of the DEFORM-3D finite element software and the point tracing method, the forming process of stepped shafts and the forming mechanism of concaves at shaft ends were studied. Based on the forming features of stepped shafts, rolling pieces were designed using variable cone angle billets. Single-factor tests were conducted to analyze the influence law of the shape parameters of billet with variable cone angle on end concaves, and rolling experiments were performed for verification. According to the results, during the rolling process of stepped shafts, concaves will come into being in stages, and the increasing tendency of its depth is due to the wave mode, the parameters of cone angle α, the first cone section length n. Furthermore, the total cone section length m has an increasingly weaker influence on the end concaves. Specifically, cone angle α has the most significant influence on the quality of shaft ends, which is about twice the influence of the total cone section length m. The concave depth will decrease at the beginning, and then increase with the increasing of the cone angle α and the first cone section length n, and it will decrease with the increasing of the total cone section length m. Finite element numerical analysis results are perfectly consistent with experimental results, with the error ratio being lower than 5%. The results provide a reliable theoretical basis for effectively disposing of end concave problems during CWR, rationally confirming the shape parameters of billets with a variable cone angle, improving the quality of stepped shaft ends, and realizing the near-net forming process of cross-wedge rolling without a stub bar.

The Research on the Generated Mechanism about the End Concavity of Shaft in the Closed Type of Cross Wedge Rolling

2015 ◽  
Vol 1095 ◽  
pp. 888-893 ◽  
Author(s):  
Ji Dong Ma ◽  
Chang Shu ◽  
Bao Shou Sun ◽  
Cheng Chao ◽  
Chao Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analysis Software ◽  
Cross Wedge Rolling ◽  
Rigid Plastic ◽  
Element Analysis ◽  
Closed Type ◽  
Theoretical Significance ◽  
Material Utilization ◽  
Deform 3D

To further improve the material utilization in cross wedge rolling, the paper simulated the forming of closed cross wedge rolling through DEFORM-3D, a rigid-plastic finite element analysis software, and analyzed the distribution and changing rule on the fields of strain and displacement in the parts rolling. Then the paper clarified the generated mechanism about the end concavity of shaft in the closed type of cross wedge rolling, which has great theoretical significance and engineering applied value in controlling and decreasing the end concavity in closed type cross wedge rolling and improving the parts’ end quality.

The Strain Analysis at the Broadening Stage of the Hollow Railway Axle by Multi-Wedge Cross Wedge Rolling

2014 ◽  
Vol 494-495 ◽  
pp. 457-460 ◽  
Author(s):  
Bin Hu ◽  
Xue Dao Shu ◽  
Peng Hui Yu ◽  
Wen Fei Peng
Keyword(s):  
Production Efficiency ◽  
Strain Analysis ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Mechanism ◽  
Railway Axle ◽  
The Finite Element Analysis ◽  
Scientific Significance ◽  
Deform 3D

The paper is based on the newest hollow railway axle, which utilizes the Pro/E designed multi-wedge cross wedge rolling (MCWR) model, utilizes the finite element analysis software DEFORM-3D to complete the numerical simulation about the whole stage of the hollow railway axle forming process, and analyzes the strain rule at the broadening stage of the hollow railway axle, especially conducts a detailed research on forming character into the strain rule at the multi-wedge transition stage, and finally gets the strain forming mechanism of the hollow railway axle at the broadening stage. The result of the research on the strain rule poses great scientific significance on enhancing the product quality and the production efficiency of the hollow railway axle, and improving the theory of multi-wedge cross wedge rolling.

scholarly journals Numerical and Experimental Study on the Thermodynamic Coupling of Ti-6Al-4V Blade Preforms by Cross Wedge Rolling

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1054 ◽  
Author(s):  
Hongchao Ji ◽  
Jianwei Dong ◽  
Long Xin ◽  
Xiaomin Huang ◽  
Jinping Liu
Keyword(s):  
Titanium Alloy ◽  
Metal Flow ◽  
High Strength ◽  
High Heat ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Finite Element Software ◽  
Distribution Laws ◽  
Aero Engines ◽  
Thermodynamic Coupling

Titanium alloy possesses high strength, good corrosion resistance, and high heat resistance; thus, it is widely used in the aerospace and other fields. Blades of titanium alloy are important components of aero-engines and are essential to the engines operation. In this work, a Ti-6Al-4V blade was formed by cross wedge rolling (CWR) to realize the near net-shape of an aero-engine blade. First, thermal simulation experiments of Ti-6Al-4V were carried out to obtain the thermal deformation constitutive equation of the alloy. The finite element software Deform-3D was then used to simulate the thermodynamic coupling of the forming process, and the metal flow, temperature, and stress–strain distribution laws during the forming process were analyzed. Finally, experimental verification of the Ti-6Al-4V blade was carried out by using an H500 CWR mill. The results revealed the feasibility of applying CWR to preform Ti-6Al-4V blades.

scholarly journals Optimal design for outer rings of self-lubricating spherical plain bearings based on virtual orthogonal experiments

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878340
Author(s):  
Lingzhu Gong ◽  
Xiaoxiang Yang ◽  
Kaibin Kong ◽  
Shuncong Zhong
Keyword(s):  
Structural Parameters ◽  
Equivalent Plastic Strain ◽  
Outer Ring ◽  
Forming Process ◽  
Finite Element Software ◽  
Orthogonal Experiments ◽  
Balance Analysis ◽  
New Type ◽  
End Wall

To improve the product quality of self-lubricating spherical plain bearing, a new shape of the outer rings for spherical plain bearings was optimally designed based on virtual orthogonal experiments using finite element software ABAQUS. The depth inclined end wall, together with the length of annular wall, the depth of annular concavity, the outer ring thickness, and the edge radius were taken as the main structural parameters in the analysis. For the evaluation parameters, the maximum bearing clearance, the maximum contact pressure, the maximum extrusion load, and the maximum equivalent plastic strain were considered. The optimal structure parameter combination was identified based on the intuitive comprehensive balance analysis method. The simulation results demonstrated much improvement for the forming quality by using a new type of the outer ring, which was optimized by the virtual orthogonal experiments. The new type of the outer ring could be used to the forming process in assembling the spherical plain bearings.

Numerical Simulation of Precision Forming for Blade Rotor Based on DEFORM

2011 ◽  
Vol 130-134 ◽  
pp. 2388-2391
Author(s):  
Fang Liu ◽  
Lu Yun Zhang
Keyword(s):  
Numerical Simulation ◽  
Metal Flow ◽  
Flow Rule ◽  
Stress And Strain ◽  
Deformation Characteristics ◽  
Forming Process ◽  
Plastic Forming ◽  
Deform 3D

In order to study the deformation characteristics of the blade rotor in the precision forming, by means of the plastic forming software DEFORM-3D, the forming process is simulated. It is concluded that (1) the change of the stress and strain in different stages was simulated during the entire forming process. (2) Based on the stress and strain distributions, the analysis of the metal flow rule and the mechanism of the filling mold was proceeded to find that the properties of the blade rotor can be enhanced by means of the precision forming.

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