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1、 430709 内部资料锻压名词解释IronA silvery-white, lustrous, malleable, ductile, magnetic or magnetizable, metallic element occurring abundantly in combined forms, notably in hematite, limonite, magnetite, and taconite, and used alloyed in a wide range of important structural materials. 赤铁矿、褐铁矿、磁铁矿和角岩SteelA gen
2、erally hard, strong, durable, malleable alloy of iron and carbon, usually containing between 0.2 and 1.5 percent carbon, often with other constituents such as manganese, chromium, nickel, molybdenum, copper, tungsten, cobalt, or silicon, depending on the desired alloy properties, and widely used as
3、a structural material.锰、铬、镍、钼、铜、钨、钴或硅等Upsetting(墩粗)：is defined as free forming,by which a workpiece segment is reduced in dimension between usually plane,parallel platens.It also includes coining and heading,closed-die forming,shape upsetting,or die heading involve tools which contain the intended s
4、hape wholly or in part.rolling(轧制):can be defined as a compressive deformation process in which there is either a continuous or a stepwise defoemation with one or more rotary tools(rolls). It belongs to the compressive deformation processes,and has been classified based on kinematics,tool geometry,a
5、nd workpiece geometry.thermal fatigue(热疲劳):occurs on the surfacce of the die impression in hot forming and results in heat crack.explosive forming(爆破成形):an underwater explosion generates a shock wave,which in turn deforms a sheet of metal into a female die.Magnetic forming(磁成型)：is related to explosi
6、ve forming as it is also a high energy rate process.this technique involves the rapid discharge of stored electrical energy from a bank of capacitors to abtain a high current flow through a coil,producing a pulsed magnetic field around the coil windings.伸长率 EL:Used as a measure of ductility,the%Elon
7、gation at failure.EL,is the %elongation of the specimen when fracture ocurs.An alternative measurement of ductility is the %Area Reduction.AR.However, the EL measurement is often preferred because of the ease determining the value from a tensile test.拉伸试验基本思想 The Basic Idea of a Tensile Test:in a te
8、nsile test,a secimen is puled from both ends.Load cells measure the force applied to the specimen throughout the stroke.Likewise,a device called an extensometer measures the change in length of the gate region.From this test a graph of Load vs.Elongation(in inches,not %)will be obtained.无压 U-模弯曲： U-
9、die bending without pressure pad:as in V-die bending,the process is characterized by different stages of deformation.The punch establishes contact with the sheet and effects elastic bending which produces a circular arc in the domain of the web due to the constant moment distribution.加压 U-模弯曲： U-die
10、 bending with pressure pad:The pressure pad is intended to keep the web from bending by pressing it against the bottom of the punch throughout the entire bending process.Coining becomes superflouous as a result.Except for this difference,the bending process is identical to bending without a pressure
11、 pad 430709 内部资料放电加工 EDM -Electro-discharge Machining The die block is mounted inside a tank containing a dielectric fluid,which is usually a hydrocarbon oil.The shaped metal or carbon electrode are connected to a ower soure工程应力应变：To interpret the result of the test for any random part geometry,the
12、load-elongation data(or load-stroke data as it is often called)must be converted to stresses and strains.Given the initial geometry of the specimen,any point on the load-stroke curve can be converted using the following equations:Engineering Stress 西格玛 e=F/A0 Engineering Strain e=L/L0拉深 Deep drawing
13、In deep drawing,a sheet blank(hot or cold ),usually subjected to a peripheral hold-down pressure,is forced by a punch into and through a die to form a deep recessed part having a wall thickness substantially the same as that of the blank.This process is used to produce cylindrical or prismatic cups
14、with or without a flange on the open end.Cups or tubes can be sunk or redrawn to increase their length and to reduce their lateral dimensions.金属旋压 Metal SpinningSpinning is the process of shaping seamless dished parts by the combined forces of rotation and pressure.spinning does nt result in any cha
15、nge in thickness.橡皮成形 Rubber formingA block of rubber is confined in the retainer ,when forced upon the piston in a press ,the rubber is pressurized rather like a fluid.爆炸成型 Explosive Forming It is a manufacturing technique that uses explosions to force metal into dies and molds. The explosives are
16、typically either detonated(引爆) underwater or in direct contact with the materials. The technique is useful for short production runs of conventionally difficult-to-manufacture parts.爆炸成型分类 Contact operations place the explosive in direct contact with the metal. Standoff operations places the explosive charge some distance away from the workpiece.挤压 Extrusion：Owing to the fibrous structure developed in the extrusion direction
