Dissertation > Excellent graduate degree dissertation topics show

Research of Variable Blank Holder Force Optimization Design Based on Approximate Model

Author: WangRiChao
Tutor: GongZhiHui
School: Hunan University
Course: Mechanical Engineering
Keywords: Variable blank holder force Respond Surface Method Genetic Algorithm Optimization design Stamping
CLC: TG386
Type: Master's thesis
Year: 2013
Downloads: 19
Quote: 0
Read: Download Dissertation

Abstract


Blank holder force is an important process parameter in sheet metal formingprocess, the main function of blank holder force is to generate frictional resistance inorder to increase the tensile stress of sheet metal, to control the flow of material and toavoid the wrinkling of sheet metal. In sheet metal forming process, the traditionalconstant blank holder force is often difficult to control the defects such as wrinkling,springback and crackling simultaneously. So some researchers put forward variableblank holder force control method, which set different blank force in differentlocations and travels, and can improve sheet metal forming quality by fully takingadvantage of the formability of material.Generally, according to the load mode, the control force of blank holder force i sdivided into five categories, constant load mode, increase mode, decrease mode,mixed mode and pulsation mode. At present, the research of variable blank holderforce technology by domestic and foreign researchers mainly focus on simple shapeparts such as conical and cylindrical parts, but as to the question that which kind ofload mode is most conductive to the forming process of sheet metal, researchers fromdifferent countries have different opinions based on their own research outcomes, auniform mode has not been given. Due to the shape of different stamping parts arealways different, the choice of variable blank holder force should be determinedaccording to the shape of actual part. Some existed research has applied optimizationmethod to get the curve of variable bank holder force, but it has always been adifficulty on how to describe the curve during the optimization process. In view of this,this paper proposed a manner that curve is constructed by points to obtain theexpression of variable bank holder force curve, the main research content is:（1） The variable blank holder force forming process of stamping is analyzed,and a new method to determine the upper and lower limits of variable blank holderforce is put forward.（2） The punch stroke is divided into some small segments, some variableblank holder force sampling points is set up on every segment by using UniformLatin-square experiment design method, the smooth variable blank holder force curveis constructed through these sampling points.（3） Taking the thickness variation of formed part as objective function, the variable blank holder force curve is optimized by the integration of Respond SurfaceModeling technology, Uniform Latin-square experiment design method and GeneticAlgorithm, the feasibility of the method to acquire variable blank holder force isvalidated through simulation.In allusion to the stamping process of top beam connection plate, a design is putforward based on Respond Surface Modeling technology and Uniform Latin-squareexperiment. Taking the maximum grid thickness difference of formed part as objectivefunction, the variable blank holder force load curve is optimized through GeneticAlgorithm. Example analysis results show that the stamping quality of sheet metal canbe improved by using the optimized variable blank holder force load curve.

Related Dissertations

  1. Development of the Platform for Compressor Optimization Design and Aerodynamic Optimization Design in the Transonic Compressor,TH45
  2. Study on Taste Characteristic of Taste Peptide Enzymatic Production from Oyster Base on A Neural Network Method,TS254.4
  3. BP network optimization based on genetic algorithm optimization of the biodiesel process,TE667
  4. Finite Element Analysis and Optimization Design of a Tractor Cab,S219.02
  5. Mining resources based on genetic algorithm optimization model of,O224
  6. CN100 auto body stamping die development of concurrent engineering research,U468.2
  7. The Research on Manipulator Trajectory Planning,TP242
  8. Dynamics Analysis and Optimization Design of Hydraulic Excavator Working Equipment,TU621
  9. Study on Optimization of Energy Structure and Countermeasures of New Energy Development During "The Twelfth Five-Year Plan",F206;F224
  10. Optimization Study on Gating System and Molding Process Parameters of Injection Mold Based on Simulation,TQ320.662
  11. The Best Planning and the Algorithm Research of the Cargo Dispatch of Physical Distribution Center,TP301.6
  12. Research and Application of Single-Stage Multi-Product Batch Scheduling Based on Quantum Genetic Algorithm,TP18
  13. Quantum Genetic Algorithm and Its Application in the Scheduling Problem,TP18
  14. Study on Fuzzy Logic-based License Plate Recognize System,TP391.41
  15. Research on Three-dimensional Surface Splicing Method Based on Genetic Algorithm and the Wavelet Transformation,TP391.41
  16. FEA of the Small Multi-function Chassis Frame and Its Lightweight Design,S223.91
  17. The Application Research of City Meteorological Forecast Based on Genetic Neural Network,P45
  18. Application Research of Genetic Neural Network in Surface Water Evaluation,X824
  19. The Method Research and Application on Electronic Equipment Fault Diagnosis,TN710
  20. Research of Adaptive Active Noise Control Based on Neural Network,TP183
  21. Study on Leakage Detection of Urban Water Distribution System,TU991.33

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Cold stamping ( sheet metal processing) > Cold stamping process
© 2012 www.DissertationTopic.Net  Mobile