Effects of Forging Stream Line on Tensile Strength Using FEM Simulation

Shih, Ching-Wei; Tzou, Gow Yi; Chang, Kao-Hua

doi:10.1155/2014/216246

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…FEM is convenient to calculate the sleeve slippage displacement in by explicit dynamics, but the quasistatic mechanical model lacks the capacity in this area. FEM simulation possesses the superiority to solve the nonlinear contact problem [16][17][18].…”

Section: B)mentioning

confidence: 99%

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Optimization of Shaft Sleeve Slippage in High-Voltage Circuit Breaker Operation Mechanism

Zhao¹,

Zhang²,

Wu³

et al. 2015

TOMEJ

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High-voltage circuit breakers are mechanical switching devices which connect and break current circuits (operating currents and fault currents) and carry the nominal current in closed position. As a result of multi-running, the shaft sleeve in operation mechanism could slip and even strip from the shaft at the hinge joint, which decreases the system reliability. In this work, investigations on the cause of sleeve slippage are proceeded, and the dimension parameters of shafting components where sleeve slippage occurs are optimized by incorporating a quasi-static mechanical model with Taguchi method. By developing and analyzing the mechanical model for the shaft sleeve slippage, it indicates that the sleeve slippage displacement has a same variation tendency with the shaft deflection. Theoretical equations are derived by using force analysis and superposition method to descript the analytic function of the shaft deflection. As the variables within the analytic function of the shaft deflection, the diameter and length of the shaft and the corresponding shaft sleeve length are selected as the control parameters in the optimization model. Moreover, several experiments are conducted by using the L18 (mixed orthogonal array) design method. Considering that the local mechanical characteristics such as sleeve strain are difficult to monitor via experimental method, an FEM simulation model is established to give the sleeve slippage displacement. Different levels of control parameters are introduced into the mechanical model and FEM simulation according to Taguchi method. The results from signal-to-noise (S/N) and ANOVA analysis (analysis of variance) reveal that shaft diameter is the most significant factor determining sleeve slippage in high-voltage circuit breaker operation mechanism, and that a larger diameter of shaft, a shorter shaft length and a longer sleeve length can reduce the sleeve slippage effectively. Meanwhile, the theoretical model is verified and enhanced by the FEM model.

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Section: B)mentioning

confidence: 99%

“…(5c), it indicates that a large stress appeared in the center of shaft and thus produces the shaft deflection, which is calculated in the FEM model and Equation (11). In this work, ABAQUS meshes the strand bundle with 3D solid elements [16]. The input data for ABAQUS is presented in Table 2, which is also available for the theoretical model.…”

Section: B)mentioning

confidence: 99%

Optimization of Shaft Sleeve Slippage in High-Voltage Circuit Breaker Operation Mechanism

Zhao¹,

Zhang²,

Wu³

et al. 2015

TOMEJ

View full text Add to dashboard Cite

show abstract

“…They adopt the feature-based method with focusing on the location and timing of occurring defects to complete these feature requirements for these problems in early stages before redesigning the tool designs, also fix these features to avoid occurring the defective phenomenon with initiating feature requirements that caused by the material flowing in follow-up forming stages again. Shih et al [9] and Sun et al [10] explore that when the bolt is forging and forming, its tensile strength would be influenced by the crack of forging stream line. Therefore, the simulation Simufact software is used to know the cause of cracking the forging stream line, changing tool designs to reduce the number of cracked forging stream lines, and then improving bolt finished products' tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Multi-stage forging on torx-pin screw with high torque

2017

Self Cite

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Abstract. The study assumes constant shear friction to simulate multi-stage forging on torx-pin screw with high torque using FEM commercial software. Because the screw head has a plum needle shape with the effect of high torque, the 3D simulation model is used to explore the effective stress, the effective strain, the velocity field, and the forging force in each stage. The forming pass schedule considers three stages to obtain the product, and uses the Deform-3D software to explore the feasibility of forming pass schedule. Finally, the realistic manufacturing of torx-pin screw can be carried out to compare with the simulation results to verify the acceptance of FEM simulation. The maximum dimension error between simulation and experiment is around 2.45%, thus the feasibility of FEM simulation to die design for manufacturing the torx-pin screw can be verified.

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An Investigation of Forging Stream Line and Tool Design on Multi-Stage Cold Forming of a Long Circular Pipe Part

Shih

Tzou

Chang

2016

Transactions of the Canadian Society for Mechanical Engineering

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The study aims to explore the reasons for why the fracture defects in the forging of a long circular pipe part occurred. Besides, the tool design has been proposed to eliminate the fracture defects. The flow direction, the velocity, the effective stress, the effective strain, the damage value, and so on, can be observed by using the point tracking function in the commercial simulation software. Moreover, the forging stream line occurring in the work-piece formation based on the simulation software is compared with that in the real product in order to understand the reasons for the fracture. The tool designs are modified accordingly, and the simulation software is used to confirm the acceptance of tool designs. Finally, appropriate forging has been performed to as per product requirements.

show abstract

Effects of Forging Stream Line on Tensile Strength Using FEM Simulation

Cited by 3 publications

References 5 publications

Optimization of Shaft Sleeve Slippage in High-Voltage Circuit Breaker Operation Mechanism

Optimization of Shaft Sleeve Slippage in High-Voltage Circuit Breaker Operation Mechanism

Multi-stage forging on torx-pin screw with high torque

An Investigation of Forging Stream Line and Tool Design on Multi-Stage Cold Forming of a Long Circular Pipe Part

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