Numerical Simulation of the Cooling Process of Extruded Plastic Profiles within Vacuum Calibrators

2005 ◽  
Vol 291-292 ◽  
pp. 619-624 ◽  
Author(s):  
D.Y. Zhao ◽  
Min Jie Wang ◽  
M.C. Song
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Cooling Water ◽  
Transient Temperature ◽  
Cooling Process ◽  
Design Problems ◽  
Extrusion Die ◽  
Transient Temperature Field ◽  
Functional Blocks ◽  
Important Basis

Plastic profiles produced by extrusion die are cooled down and calibrated by calibrators, so it is an important basis to solve design problems of calibrators that how to obtain the transient temperature field of cooling process of hot plastic profiles. Based on the analysis of heat transfer ways during the cooling process, computation model, initial and boundary conditions are studied deeply, and then ANSYS is applied to simulate the cooling process of plastic profiles. Lastly, the transient temperature field of the cooling process is gain. Results of the numerical simulation show that the temperature drops of functional blocks, main-walls and inner-ribs are reduced in order of priority. Based on the results, the cooling water channels can be adjusted in order to improve the distributing uniformity of temperature field. All this is effective to the calibrators’ design.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

Use of Shell Elements for the FEM-Simulation of the Welding Process of Sheet Metal Parts

2005 ◽  
Vol 6-8 ◽  
pp. 209-216 ◽  
Author(s):  
Michael F. Zäh ◽  
L. Papadakis ◽  
Sven Roeren ◽  
T. Hornfeck
Keyword(s):  
Temperature Field ◽  
Sheet Metal ◽  
Early Stage ◽  
Welding Process ◽  
Transient Temperature ◽  
Work Piece ◽  
Cooling Process ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Transient Temperature Field

During the joining process of complex body components in the automobile industry, dimensional accuracy is essential. In order to predict the behavior and to improve the geometrical quality of joined sheet metal parts during the welding and cooling process, a simulation method by means of finite elements is applied. This should be done in the early stage of the product’s life cycle to reduce process adjustments, which are time and money consuming. In recent years the simulation of welding was basically feasible by models consisting of volume elements. This way the metallurgical phase transformation, which is responsible for the behavior of the treated parts during the cooling process, can be established for a specific material. The use of volumes has a negative influence on the calculation time and it is not applicable for sheet metals. Especially, if effects from previous forming processes are to be considered. Additionally, the application of shells can meet the requirements of an analysis of the effects of welding when the metallurgical material properties are taken into account. In this paper an example of a sheet metal (DC04, former St 14) will be examined with the aid of a finite element analysis. Firstly, a transient temperature field is calculated in a thermal simulation by applying a certain method. In this calculation only the thermal properties of the material are used. Secondly, the transient temperature field is used as the initial load for the thermo-mechanical analysis. The distortion and the residual stresses of the work piece can be calculated using thermo-mechanical properties and material phase transformations.

Numerical Simulation of Spot Welding Galvanized Sheet with Insert Material

2012 ◽  
Vol 557-559 ◽  
pp. 2274-2278
Author(s):  
Ge Wang Shuai ◽  
Ping Fang ◽  
Zheng Hua Guo
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Mechanical Model ◽  
Spot Welding ◽  
Welding Process ◽  
Transient Temperature ◽  
Stress Distributions ◽  
Copper Strip ◽  
Transient Temperature Field ◽  
Welding System

In this paper, with the ANSYS, a 2D axisymmetric coupled thermo-electro-mechanical model was developed to analyze the spot welding process（RSW） of zinc coated steels with copper strips as an insert material between electrode and workpiece. A transient temperature field obtained from a prior performed thermal–electrical simulation of RSW process is applied as nodal load on the model to simulate the stress distribution. The temperature and stress distributions in such a welding process were obtained and compared with a conventional resistance spot welding process. The results show that using the same welding process parameters, the maximum transient temperature at the electrode surface is lower than the conventional RSW process due to the use of copper strips, which helps to extend electrode lifetime. In addition, the presence of inserted copper strip increased the resistance of welding system, thus generated much more heat to form larger nugget.

Numerical Simulation on Temperature Field of the Molten Pool under the Variable Duty Ratio Laser with the Inner Coaxial Powder Feeding

2011 ◽  
Vol 464 ◽  
pp. 405-408
Author(s):  
Gao Lian Shi ◽  
Shi Hong Shi ◽  
Shao Hua Wu ◽  
Yong Kang Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Power Distribution ◽  
Molten Pool ◽  
High Speed ◽  
Duty Ratio ◽  
Transient Temperature ◽  
Outer Diameter ◽  
Transient Temperature Field ◽  
Powder Feeding

Aimed at the process of laser rapid prototyping with inner coaxial powder feeding, the finite element model on the transient temperature field of the molten pool is built and the transient temperature field of the molten pool under the laser with variable duty ratio is simulated numerically. The results show that the duty ratio of the laser affects the shape, dimension and power distribution of the molten pool. With the processing parameters: laser power (P)=3000W, outer diameter(d2)=4mm, scanning speed(V=5mm/s), the ideal value of ratio duty(K) is from 0.35 to 0.6. The shape of the molten pool is saddle shape or crescent. The position of the molten pool falls behind the center of the laser beam with the deviation to the both sides. Through shooting the molten pool with the high speed CCD camera, we find the experiments show that the images are close to the numerical simulation nephograms and then demonstrate that the numerical simulations are right.

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