金属塑性成形)introsuction

1、-fundamentals & applications of metal forming processesEngineering plasticity1 Introduction1.1 Definition and scope of the subject When a solid metal is subjected to a load of small magnitude, it deforms elastically such that the strain is directly proportional to the stress and when relieved of

2、 the stress, it eventually returns to its original dimension. Elastic deformation is therefore a reversible and linear deformation. (MATERIALS STRENGH is a course to study the metal behavior in elastic stage) Under the influence of a substantial load, a solid metal may experience inelastic or plasti

3、c deformation which is irreversible and nonlinear and the body is permanently deformed. This course is to study the metals behavior in plastic stage.1 Introduction 1) what metal forming technology can do for us ?2) why metals can be plastically deformed ? (physical metallurgy)3) how metals deform un

4、der applied load or how load is applied to obtain a required part shape? (theory of plasticity)This course = physical metallurgy + theory of plasticityMetal forming* - a metal working process in which the shape of a workpiece is altered to the required shape by plastic deformation without material r

5、emoval.Plasticity* the materials ability of being permanently shaped or formed without fracture .The study of this course is to find answers to the following questions:1 Introduction1.2 Outlines of the course 1) Stress analysis2) Strain analysis7) Strain rate & temperature3) Yield criteria6) Wor

6、k hardening5) Plastic anisotropy8) Application of Simplified analytical methods to practical metal forming processes4) Stress strain relation1 Introduction1.3 Typical metal forming processes Bulk forming1) Free forging2) Die forging6) Rotary forging3) Rolling5) Drawing4) ExtrusionSheet metal forming

7、1) Blanking2) Piercing6) Ironing3) Bending5) Deep drawing4) Bulging8) Other special forming processes7) Spinning1 Introduction1 Introduction1. 4 Major advantages of the processMechanical properties of the material improved2) High productivity3) High material utilization ratio1.5 Characteristics of the subjectMathematical theories are phenomenologica