Research on GA-ANN Integration and Its Applications to Cold Extrusion Process Design

2006 ◽  
pp. 897-900
Author(s):  
Ting Wei Ji ◽  
Jun Gao ◽  
Guo Qun Zhao ◽  
Cheng Rui Zhang
Keyword(s):  
Process Design ◽  
Extrusion Process ◽  
Cold Extrusion

Research on GA-ANN Integration and Its Applications to Cold Extrusion Process Design

2006 ◽  
Vol 532-533 ◽  
pp. 897-900
Author(s):  
Ting Wei Ji ◽  
Jun Gao ◽  
Guo Qun Zhao ◽  
Cheng Rui Zhang
Keyword(s):  
Genetic Algorithm ◽  
Process Design ◽  
Binary Code ◽  
Fitness Function ◽  
Extrusion Process ◽  
Selection Method ◽  
Cold Extrusion ◽  
Design System ◽  
Roulette Wheel Selection ◽  
Roulette Wheel

Based on the research of the functions of ANN-based cold extrusion process design system, genetic algorithm (GA) is proposed to optimize the topology and parameters of artificial neural networks (ANN), in order to improve the running efficiency of the networks. The binary encoding approach is implemented to represent the GA chromosome. The code string or the chromosome was divided into three parts: the first part is the binary code of the cold extruded part; the second part is the binary code of the topology and parameters of ANN; the last is the binary code of the semi-cold-extruded-part or the billet. The 1/F(X) function is selected as the fitness function in GA, where, X represents the binary code of the cold extruded part, F(X) represents the error between the real outputs of ANN and the desired results; the biased roulette wheel selection method is used for selecting operation in this paper; two-point crossover and one-point mutation are selected for these two types of genetic operations. Finally, the typical cold extruded part is used for verification as an example by using the optimized ANN, the result shows that ANN optimized by GA has efficiency and validity in the cold extrusion process design system.

scholarly journals Numerical Simulation and Process Optimization of Internal Thread Cold Extrusion Process

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3960
Author(s):  
Hong-Ling Hou ◽  
Guang-Peng Zhang ◽  
Chen Xin ◽  
Yong-Qiang Zhao
Keyword(s):  
Numerical Simulation ◽  
Process Parameters ◽  
Orthogonal Experiment ◽  
Extrusion Process ◽  
Extrusion Temperature ◽  
Maximum Temperature ◽  
Cold Extrusion ◽  
Internal Thread ◽  
Bottom Hole ◽  
Extrusion Forming

In the internal thread extrusion forming, if the process parameters are not selected properly, the extrusion torque will increase, the extrusion temperature will be too high, or even the tap will break. In order to obtain effective process parameters under certain working conditions, this paper uses a combination of numerical simulation and process experiment to analyze the influence of the bottom hole diameter, extrusion speed, and friction factor on the extrusion torque and extrusion temperature. Through an orthogonal experiment, the significant influence law of different process parameters on the extrusion torque and extrusion temperature was studied, and the order of their influence was determined. Based on the optimal process parameters, numerical simulations and process tests were carried out, and the extrusion effect and related parameters were compared and analyzed. The results show that the extruded thread has clear contour, uniform tooth pitch, complete tooth shape, and good flatness. Compared with before optimization, the maximum extrusion torque has been reduced by 37.15%, the maximum temperature has been reduced by 29.72%, and the extrusion quality has been improved. It shows that the optimized method and optimized process parameters have good engineering practicability.

A Process Sequence Design of Multi-Step Cold Extrusion Process for Hollow Parts

2005 ◽  
pp. 4195-4198
Author(s):  
Jae Hyun Shim ◽  
J.H. Ok ◽  
Hyoung Jin Choi ◽  
H.S. Koo ◽  
Beong Bok Hwang
Keyword(s):  
Extrusion Process ◽  
Cold Extrusion ◽  
Sequence Design ◽  
Process Sequence ◽  
Process Sequence Design

The Influences of the Die Half Angle of Taper Die During Cold Extrusion Process

2013 ◽  
Vol 38 (5) ◽  
pp. 1201-1207 ◽  
Author(s):  
S. Syahrullail ◽  
C. S. N. Azwadi ◽  
Y. M. Najib
Keyword(s):  
Extrusion Process ◽  
Cold Extrusion ◽  
Half Angle ◽  
Taper Die

scholarly journals The Influence of the Bottom Hole of Cold Extruding Internal Thread on Thread Quality

Mechanika ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 335-341
Author(s):  
Hongling Hou ◽  
Xin CHEN ◽  
Yongqiang ZHAO ◽  
Yayin HE ◽  
Changqian WANG
Keyword(s):  
Numerical Simulation ◽  
Extrusion Process ◽  
High Rate ◽  
Cold Extrusion ◽  
Internal Thread ◽  
Important Indicator ◽  
Good Surface ◽  
Bottom Hole ◽  
Simulation Results ◽  
The Relationship

The diameter of the threaded bottom hole determines whether the extrusion can proceed smoothly and the fullness of the tooth shape after extrusion. The tooth height rate is an important indicator of the strength of the threaded connection. In order to establish the relationship between the diameter of the bottom hole and the tooth height of the extruded internal thread, this paper takes the aluminum alloy M8×1.25 mm internal thread as an example, and uses a method of combining numerical simulation and process test. Obtained the changing law of internal thread profile and tooth height rate of extruded workpieces with different bottom hole diameters. Using MATLAB to fit the numerical simulation results, the relationship between the tooth height of the internal thread and the diameter of the prefabricated bottom hole of the workpiece was obtained. The reliability of the numerical simulation results and the feasibility of the fitting formula are verified through experiments. The results show that the diameter of the prefabricated bottom hole of the workpiece is controlled within 7.33~7.39 mm when the M8×1.25 mm internal thread is processed by the cold extrusion process. The high rate of the internal thread after extrusion meets the requirements of thread connection strength, and the internal thread has high forming quality and good surface quality.

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