scholarly journals Force Model for Complex Profile Tool in Broaching Inconel 718

2021 ◽  
Author(s):  
Jing Ni ◽  
Kangcheng Tong ◽  
Zhen Meng ◽  
Kai Feng
Keyword(s):  
Shear Zone ◽  
Fem Simulation ◽  
Projection Area ◽  
Force Model ◽  
Arc Length ◽  
Complex Profile ◽  
Modified Model ◽  
Aero Engines ◽  
Complex Parts ◽  
Direction Model

Abstract Complex profile broaches are widely used in the manufacture of complex parts of aero-engines, but their cutting forces in the broaching process are difficult to predict and control. A new numerical model for broaching force with complex profile tools is presented, which considers the area and arc length of curved shear zone projection. The area and arc length were calculated by the curve function of the projection plane, which is firstly predicted by FEM simulation. Compared with the conventional force model, the accuracy of the modified model has been moderately improved. Ultimately, the modified main broaching force (Y-direction) model and the modified normal force (Z-direction) model show a significant improvement in accuracy by 4.8% and 9.7%, respectively. It suggests that the projection area of curved shear zone A1 and the projection arc length of curved shear zone l1 have a big impact on the broaching process. Moreover, the modified model proposed in this paper can provide guidance for the design of complex profile tools and facilitate the efficient and high-precision machining of complex parts.

A Longitudinal Force Model for Multibody Railroad Vehicle System Applications

2005 ◽  
Author(s):  
Quan Meng ◽  
Jason R. Heineman ◽  
Ahmed A. Shabana
Keyword(s):  
Time Derivative ◽  
Rolling Resistance ◽  
Longitudinal Force ◽  
Force Model ◽  
Arc Length ◽  
Track Geometry ◽  
Velocity Transformation ◽  
Draft Gear ◽  
Angular Velocities ◽  
Air Brake System

In this paper, a model is developed to analyze the longitudinal forces of interaction between the vehicles within a train consist. The track geometry is described in a preprocessor in terms of an arc length parameter. A single degree of freedom vehicle model is developed, in which the nonlinear equation of motion of the vehicle is expressed in terms of the track arc length using a velocity transformation. The velocity transformation matrix is obtained by expressing the Cartesian and angular velocities in terms of the time derivative of the arc length. Models are developed for representing; braking forces from a typical air brake system, coupler reactions from draft gear or end-of-car cushioning devices, and the rolling resistance acting on each vehicle. An example of a 10-car train is used to demonstrate the use of the formulations presented in this paper. Different simulation scenarios, including varying track configurations and brake failure, are presented.

Evacuation Simulation in the Narrow Stair with Revised Social Force Model

2013 ◽  
Vol 409-410 ◽  
pp. 1577-1582 ◽  
Author(s):  
Hua Wu ◽  
Juan Huang ◽  
Zhong Lai Guo ◽  
Yong Gang Hu
Keyword(s):  
Computational Efficiency ◽  
Experimental Results ◽  
Force Model ◽  
Social Force ◽  
Social Force Model ◽  
Evacuation Simulation ◽  
Building Models ◽  
Psychological Force ◽  
Narrow Space ◽  
Direction Model

In this paper, a revised social force model in the stairs are discussed. Considering the influence of the gravity to the pedestrians in the stairs, we improve the model by adding the gravity factor, which makes the simulation more reality. In additional, we simplify the direction model of the psychological force between pedestrians considering the narrow space of the stair, and this will refine the computational efficiency dramatically. Furthermore, we also discussed the construction of the building models for the practical simulations. The experimental results in this paper shows the valid of the model.

Nesting of Complex 2-D Parts Within Irregular Boundaries

1996 ◽  
Vol 118 (4) ◽  
pp. 615-622 ◽  
Author(s):  
H. J. Lamousin ◽  
W. N. Waggenspack ◽  
G. T. Dobson
Keyword(s):  
Convex Hull ◽  
Computational Efficiency ◽  
Offshore Platform ◽  
Building Industry ◽  
Complex Profile ◽  
Ship Building ◽  
Shaped Part ◽  
Irregular Boundaries ◽  
Complex Parts ◽  
Placement Procedure

An algorithm is outlined for the nesting of complex parts onto resources with irregular boundaries. The algorithm adapts Albano and Sapuppo’s technique for nesting irregular profiles on rectangular resources using a novel placement procedure. Several techniques for improving computational efficiency are also described, including complex profile simplification using a modified convex hull strategy. The enhanced algorithm is applied to the nesting of irregular parts on both rectangular resources and within irregular shaped part voids as applied to the offshore platform and ship building industry.

Research on Deformation of TC4 with Complex Profile in Hot Rolling

2013 ◽  
Vol 652-654 ◽  
pp. 2073-2078
Author(s):  
Yu Hua Pang ◽  
Lei Zhang ◽  
Dong Liu ◽  
Yan Hui Yang ◽  
Gui Zhi Xiao
Keyword(s):  
Titanium Alloy ◽  
Hot Rolling ◽  
Fem Simulation ◽  
Basic Theory ◽  
Simulation Technology ◽  
Complex Profile ◽  
Mechanical Process ◽  
Performance Requirements ◽  
Tc4 Alloy ◽  
The One

TC4 alloy is widely used in engine. The method of forming is forging and mechanical process in the old days. With the complex profile of Titanium alloy, the process is quite difficult and lead to low ratio of qualified products. Therefore the method of hot rolling is chosen. According to the basic theory of hot rolling and applying the FEM simulation technology, the one symmetrical pass with different gauge between the two rollers is designed to obtain expected section with the complex profile. In order to restrict the rise of temperature basing on the characteristic of TC4 and make the flowing uniformly to meet the performance requirements, the optimum matching scheme of the pass with the roller is designed first, then the reasonable shape and dimension of the blank is determined, finally the three rolling passes of one blank rolled in one pass with different gauge is decided.

FEM-Based Prediction and Control of Milling Deformation for a Thin-Wall Web of Ti-6Al-4V Alloy

2014 ◽  
Vol 800-801 ◽  
pp. 368-373 ◽  
Author(s):  
Ting Ting Chen ◽  
Bin Rong ◽  
Yin Fei Yang ◽  
Wei Zhao ◽  
Liang Li ◽  
...  
Keyword(s):  
Tool Path ◽  
End Milling ◽  
Fem Simulation ◽  
Prediction Method ◽  
Coupling Model ◽  
Simulation Software ◽  
Force Model ◽  
Thin Wall ◽  
Dimensional Error ◽  
Milling Operations

This paper presents the prediction method of cutting force and dimensional error of Ti6Al4V alloy thin-wall components in end-milling operations. Based on the FEM simulation software and force-model, machining deformation was predicted by two kinds of FEM models, and then compared with the measured data. Results obtained from the proposed models and the tests show that the coupling model of thermal-mechanical having better agreement with the experimental results. Besides, the test results also prove the new tool-path pattern proposed in this paper is useful to reduce the machining error.

scholarly journals Establishment and Verification of the Cutting Grinding Force Model for the Disc Wheel Based on Piezoelectric Sensors

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 725 ◽  
Author(s):  
Jing Ni ◽  
Kai Feng ◽  
M.S.H. Al-Furjan ◽  
Xiaojiao Xu ◽  
Jing Xu
Keyword(s):  
Cutting Force ◽  
Grinding Force ◽  
Piezoelectric Sensors ◽  
Force Model ◽  
Arc Length ◽  
Cutting Force Model ◽  
Grinding Force Model ◽  
Proposed Model ◽  
Experimental Findings ◽  
Contact Arc

In this paper, a new model of cutting grinding force for disc wheels is presented. Initially, it was proposed that the grinding cutting force was formed by the grinding force and cutting force in combination. Considering the single-grit morphology, the single-grit average grinding depth, the effective number of grits, and the contact arc length between the grit and the workpiece comprehensively, the grinding force model and the cutting force model were established, respectively. Then, a universal grinding cutting force model was optimized by introducing the effective grit coefficient model, dependent on the probability statistical method and the grit height coefficient model with Rayleigh’s distribution theory. Finally, according to the different proportions of the grinding force and cutting force, the grinding cutting force model, with multi-particles, was established. Simulation and experimental results based on piezoelectric sensors showed that the proposed model could predict the intermittent grinding cutting force well. Moreover, the inclusion of the grit height coefficient and the effective grits number coefficient improved the modeling accuracy. The error between the simulation and experimental findings in grinding cutting force was reduced to 7.8% in comparison with the traditional model. In addition, the grinding cutting force can be divided into three segments; increasing, steadiness, and decreasing, respectively found through modeling.

A Modified Model of the Primary Shear Zone for Orthogonal Machining

2012 ◽  
Vol 229-231 ◽  
pp. 503-506 ◽  
Author(s):  
Fang Juan Zhou ◽  
Xue Lin Wang ◽  
Yu Jin Hu
Keyword(s):  
Stainless Steel ◽  
Shear Zone ◽  
Cutting Forces ◽  
Experimental Results ◽  
Correction Coefficient ◽  
Stainless Steel 316L ◽  
Modified Model ◽  
Orthogonal Machining ◽  
Proposed Model ◽  
Coordinate Mapping

A new modified model based on the non-parallel primary shear zone is presented in this paper. Experiments showed that the primary shear zone in cutting process wasn’t an absolutely parallel-sided zone. In fact, there are small inclined angles in the primary shear zone. Therefore, in this paper, a correction coefficient is proposed to predict cutting forces exactly. The coordinate mapping approach is adopted to obtain the correction coefficient and the software MATLAB is utilized to predict cutting forces. The material of stainless steel 316L is used to validate the modified model. By comparison between predicted analysis and experimental results, the proposed model shows good agreements with experiments.

Modeling Two-Point Wheel/Rail Contacts Using Constraint and Elastic-Force Approaches

2002 ◽  
Author(s):  
Ahmed A. Shabana ◽  
Khaled E. Zaazaa ◽  
Jose´ L. Escalona ◽  
Jalil R. Sany
Keyword(s):  
Contact Problem ◽  
Degrees Of Freedom ◽  
Point Contact ◽  
Elastic Force ◽  
Contact Forces ◽  
Force Model ◽  
Arc Length ◽  
Normal Contact ◽  
Contact Points ◽  
Constraint Approach

Two approaches are commonly used for solving the problem of wheel/rail contact in railroad dynamics. The first is the elastic approach in which the wheel is assumed to have six degrees of freedom with respect to the rail. The normal contact forces are defined using Hertz’s contact theory or in terms of assumed stiffness and damping coefficients. The second approach is the constraint approach in which nonlinear kinematic contact constraint equations are introduced, leading to a model in which the wheel has five degrees of freedom with respect to the rail. It is the objective of this investigation to present a new formulation for the wheel/rail contact problem based on the elastic force approach. Crucial to the success of any elastic force formulation for wheel/rail contact problem is the accurate prediction of the location of the contact points. To this end, features of multibody formulations that allow introducing arbitrary differential equations are exploited in this investigation in order to obtain a good estimate of the rail arc length traveled by the wheel set. In the formulation presented in this paper, four surface parameters are used to describe the wheel and the rail surfaces each with arbitrary geometry. In order to determine the location of the points of contact between the wheel and the rail, a first order differential equation for the rail arc length is introduced and is integrated simultaneously with the multibody equations of motion of the wheel/rail system. The method presented in this paper allows for multiple points of contact between the wheel and the rail by using an optimized search for all possible contact points. The normal contact forces are calculated and used with non-linear expressions for the creepages to determine the creep forces. The paper also discusses two different procedures for the analysis of the two-point contact in the wheel/rail interaction. Numerical results obtained using the elastic force model are presented and compared with the results obtained using the constraint approach.

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