scholarly journals Numerical Simulation and Experimental Study on Rotary Cold Extrusion Forming of Screw Rod

2021 ◽  
Vol 2101 (1) ◽  
pp. 012017
Author(s):  
Peiai Li ◽  
Baoyu Wang ◽  
Jiapeng Wang
Keyword(s):  
Wall Thickness ◽  
Extrusion Process ◽  
Simulation Software ◽  
Cold Extrusion ◽  
Extrusion Force ◽  
Forming Process ◽  
Material Loss ◽  
Screw Pump ◽  
Plastic Forming ◽  
Extrusion Forming

Abstract The rotary cold extrusion forming process is a plastic forming process with very low material loss, especially in the production of hollow screw rods with equal wall thickness. In this work, the rotary cold extrusion forming process of a hollow T2 copper screw rod with a wall thickness of 4 mm and solid T2 copper screw rod was verified by experimental method. The finite element simulation software Deform-3D was also used to simulate the rotary cold extrusion forming process of the screw rod. The effects of the die with different heights of the working belt and the different wall thickness of the billet on the eccentricity, extrusion force, and forming torque in the forming process of the screw rod were studied. The results show that it is feasible to process hollow and solid T2 copper screw rods with equal wall thickness by rotary cold extrusion. With the increase of die working belt height, the eccentricity of the screw rod becomes smaller and closer to the ideal eccentricity. With the increase of the wall thickness of the billet, the amplitude fluctuation range of the eccentricity of the screw rod gradually decreases. The higher the height of the die working belt, the greater the extrusion force and torque required in the extrusion process, and the more intense the change of torque. These results also provide theoretical guidance for the production practice and lightweight transformation of the screw pump rotor.

scholarly journals Research on Improvement of Cold Extrusion Technology of Connecting Screw

2022 ◽  
Vol 2160 (1) ◽  
pp. 012055
Author(s):  
Yuhong Yuan ◽  
Yu Ren ◽  
Quan Wu
Keyword(s):  
Metal Flow ◽  
Dimensional Accuracy ◽  
Extrusion Process ◽  
Cold Extrusion ◽  
Forming Process ◽  
Deformation Law ◽  
New Process ◽  
Simulation Results ◽  
Extrusion Forming ◽  
Extrusion Technology

Abstract In order to solve the flange and dent defects in the end face of the cold extrusion of the connecting screw, the Deform3D software is used to simulate the extrusion forming process of the connecting screw, and the velocity vector is used to study the metal flow law of the part in the cold extrusion process. According to the velocity field and deformation law obtained by the simulation, the end face depression defect in the forming process is predicted. An improved production process is proposed, and the simulation results show that the new process scheme effectively eliminates the “sag” defect on the end face of the part. Finally, the extruded parts with qualified dimensional accuracy are obtained through experiments, and the results are basically consistent with the simulation results.

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.

Honeycomb Radiator Cold Extrusion Forming Research

2013 ◽  
Vol 753-755 ◽  
pp. 149-154
Author(s):  
Sheng Guan Qu ◽  
Li Kui Liu ◽  
Wen Long Li ◽  
Guang Hong Wang ◽  
Xiao Qiang Li
Keyword(s):  
Thermal Performance ◽  
Crucial Role ◽  
Flow Condition ◽  
Optimization Design ◽  
Strain State ◽  
Cold Extrusion ◽  
Forming Process ◽  
Stress Strain ◽  
Die Structure ◽  
Extrusion Forming

Radiators plays a crucial role in thermal performance of LED Lamp, and the latest development of LED honeycomb radiator forming process has been discussed. Moreover, stress-strain state in the dies and blank flow condition with different die structures have been studied by DEFORM. Accordingly the feasibility of the optimization design also has been demonstrated. The results show that the substance flowing has a serious affect on the force to the die. And with an appropriate die structure, the uniformity of forming can be greatly improved and the force to the die can be reduced.

Investigation and Application of Cold Extrusion Forming Process in Die Structure Design of Plug Extremity

2010 ◽  
Vol 34-35 ◽  
pp. 888-892
Author(s):  
Zhi Qiang Jiang ◽  
Xi Lan Feng ◽  
Xian Zhang Feng
Keyword(s):  
Production Efficiency ◽  
Structure Design ◽  
Cold Extrusion ◽  
Manufacturing Cost ◽  
Process Technology ◽  
Forming Process ◽  
Key Technology ◽  
Die Structure ◽  
Technological Data ◽  
Extrusion Forming

a cold extrusion forming process in die structure of plug extremity is analyzed in this paper, its technological data on the tooling structure design of plug extremity are discussed, and the die architecture design and key technology in the automatic extrusion machine for plug extremity with cold extrusion forming approach were accomplished. This plug extremity equipment developed with cold extrusion forming process technology can not only achieved the process of delivering material, extruding forming and cutting-off material in automatically, but also enhanced the rigidity and intension at two ends of plug. The production efficiency and the material used ratio were increased greatly, the manufacturing cost was decreased obviously, and the plug quality with cold extrusion forming method was ensured.

Numerical simulation of the 3D flow field in a ring die pellet mill considering viscous heating

2020 ◽  
Vol 11 (03) ◽  
pp. 2050025
Author(s):  
Yong-Mei Wang ◽  
Xiao-Peng Huang ◽  
Jin-Feng Wu ◽  
Wan-Xia Yang
Keyword(s):  
Numerical Simulation ◽  
Shear Rate ◽  
Flow Field ◽  
Velocity Shear ◽  
Viscous Heating ◽  
Powder Materials ◽  
Extrusion Force ◽  
3D Flow ◽  
Forming Process ◽  
Extrusion Forming

Viscous heating has a substantial influence on the extrusion forming process and product quality of powder materials. This study selected the MUZL420 ring die pellet mill as the research object, from which a 3D flow physical model was established. The numerical simulation of 3D nonisothermal flow in the extrusion pelletizing process of granulated alfalfa was performed with POLYFLOW. The distribution laws of pressure, velocity, shear rate, viscosity, viscous heating and temperature in the flow field were revealed to thoroughly investigate the pelletizing process and provide a reference for structural optimization and process control. The results showed that two extrusion zones in the pelleting chamber were symmetrical with respect to the center, and the significant pressure gradient along the rotating direction of the ring die and the roller caused the material to flow back in the opposite direction. There were larger velocity gradients, shear rates and viscous heating levels in the deformation and compaction zone, the negative pressure zone behind the extrusion zone and the die holes. The distribution of viscosity was opposite to that of the shear rate. The temperature increase area caused by viscous heating gradually expanded from the material inlet to the bottom of the extrusion chamber along the [Formula: see text]-axis direction, and the temperature increased accordingly. The extrusion force and the forming temperature in the extrusion forming zone were captured in the numerical simulation. The extrusion forming density was calculated with the regression prediction model established through the simulation experiment of pelletizing with a ring die. Through a comparison with the results of mean alfalfa pellet density from the ring die pellet mill experiment, the relative error was less than 5%, which indicated that the numerical simulation method was reliable.

Numerical Simulation of Cold Extrusion Process of the ZA Alloy Car Sleeve Based on LS-DYNA

2013 ◽  
Vol 411-414 ◽  
pp. 3056-3059
Author(s):  
Zhi Qiang Li ◽  
Han Xun Lv ◽  
Bing Dong Liu ◽  
Zhang Yi Yu
Keyword(s):  
Equivalent Stress ◽  
Equivalent Plastic Strain ◽  
Processing Parameters ◽  
Extrusion Process ◽  
Raw Material ◽  
Cold Extrusion ◽  
Forming Process ◽  
Contrastive Study ◽  
Finite Element Technology ◽  
Extrusion Technology

In order to increase the useful life of sleeve, improve the organizational structure and reduce costs, ZA alloy materials can be used as a raw material using cold extrusion technology for production. The main content of this paper is simulating the change rules of the equivalent plastic strain, the equivalent stress and the flow in the forming process of ZA alloy in different extrusion speed and friction coefficient condition by finite element technology, making a contrastive study with the extrusion theory, and finding out the most appropriate extrusion processing parameters. The results not only provide sufficient theatrical support for the cold extrusion process of sleeve of ZA alloy, but also offer some new thoughts for the design of extrusion mold.

Deform Based 1Cr18Ni9Ti Pipe Joint Upsetting Extrusion Process Finite Element Numerical Simulation Analysis

2013 ◽  
Vol 365-366 ◽  
pp. 1128-1131
Author(s):  
Zhi Yi Huo ◽  
Ying Zhi Li ◽  
Xiu Qian Sun ◽  
Qian Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Extrusion Process ◽  
Forming Process ◽  
Element Analysis ◽  
Part Quality ◽  
Quantitative Basis ◽  
Extrusion Forming ◽  
Pipe Joint

Internal Defects are more likely to occur when 1Cr18Ni9Ti pipe joint are produced by traditional casting method or welding forming method, while the upsetting extrusion proposed in this essay can not only meet the part quality requirements, but also save material and shorten processing cycle. By numerical simulation analysis about part upsetting extrusion forming process with the finite element analysis method, we can obtain many index numerical values in part forming process, and therefore provide reliable quantitative basis for optimum design.

Study on the Intelligent Design System of Square Tube Aluminum Profile Extrusion Processes Based on VB

2012 ◽  
Vol 549 ◽  
pp. 884-888
Author(s):  
Zhi Ping Zhang ◽  
Han Wu Liu ◽  
Xiao Xia Li
Keyword(s):  
Programming Language ◽  
Intelligent Design ◽  
Extrusion Process ◽  
Design System ◽  
Aluminum Extrusion ◽  
Forming Process ◽  
Extrusion Die ◽  
Aluminum Profile ◽  
Extrusion Forming ◽  
Aluminum Profile Extrusion

According to the similar characteristics of structure, geometry and constraints conditions in the same type of extrusion process, the intelligent design system of a square tube aluminum profile extrusion forming process was established in this paper based on the VB programming language, with using parametric programming language APDL provides by ANSYS software. The parameterized optimization design plan of pre-treatment and post-processing of ANSYS analysis during a square tube aluminum extrusion forming process was achieved, and the program of a three-dimensional model of the extrusion die under Visual Lisp environment was also programmed. The human-computer interaction intelligent design system which combined with pre-processing of semi-finished product, finite element analysis of extrusion die strength, extrusion die temperature field analysis, structural optimization of the die was realized. The research results show that the system can provide program decision-making, structural design, performance analysis and graphics treatment for the actual extrusion productions of square tube aluminum extrusion process, which reduced the design time of the technical staff, and saved design cost.

Study of Extrusion Process for a Titanium Alloy Tapered Piece

2011 ◽  
Vol 228-229 ◽  
pp. 723-726
Author(s):  
Mu Meng ◽  
Zhi Min Zhang ◽  
Bao Hong Zhang
Keyword(s):  
Titanium Alloy ◽  
Energy Consumption ◽  
Production Efficiency ◽  
Maximum Load ◽  
Extrusion Process ◽  
Forming Process ◽  
Two Stage ◽  
Direct Extrusion ◽  
Die Life ◽  
Extrusion Forming

Direct extrusion forming process, two-stage extrusion forming process and composite extrusion forming process were designed for manufacturing a titanium alloy tapered piece. Comparison of the forming loads under the different processes were investigated using Deform finite element method(FEM).Considering the load size, energy consumption and production efficiency, the best extrusion forming process was eventually selected. The result showed that: In the direct extrusion forming process, the maximum load was 11.5MN, and the die life was short; In the two-stage extrusion forming process, the maximum load was only 4.25MN, but it had a poorer effectiveness and higher energy consumption because of two-stage forming processes. In the composite extrusion forming process, the maximum load was only 38.6% of direct forming process, and it had a higher effectiveness and lower energy consumption because of one-stage forming processes.

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