电梯专业英语课件04---钣金加工.pptx

1、What is sheetmetal?(什么是钣金?),The material thickness that classifies a work piece as sheet metal is not clearly defined.将工件归为钣金的材料厚度并没有明确定义。However,sheet metal is generally considered to be a piece of stock between 0.006 and 0.25 inches thick.然而，一般来认为0.006-0.25英寸厚度的原料为钣金。1英寸=25.4mm,What is sheetmetal?

2、(什么是钣金?),A piece of metal much thinner is considered to be foil and any thicker is referred to as a plate.更薄的金属片材称为箔，更厚的称为板。Where can we find sheetmetal in elevator?电梯中哪里用到了钣金呢?,Control cabinet,Car,Overspeedg overnor,Sheetmetal application in elevator电梯中钣金的应用,Sheetmetal application in elevator电梯中钣金的

3、应用,COP,Power box,inspection box in car roof,Sheetmetal Working(钣金加工),Sheetmetal working method钣金的基本加工方式有哪些？,Sheet-metal FormingBending、Deep drawingSheet-metal CuttingShearing、Blanking、Punching,钣金成型折弯、深拉成形 钣金切割剪切、下料、冲裁,Sheetmetal forming(钣金成型),Sheet metal forming processes are those in which force is

4、 applied to a piece of sheet metal to modify its geometry rather than remove any material.钣金成形是通过施加外力改变其形状，而不是去除材料。The applied force stresses the metal beyond its yield strength,causing the material to plastically deform,but not to fail.施加的外力超过材料的屈服强度，造成材料发生塑性变 形，但不会失效。,Sheetmetal forming(钣金成型),Bend

5、ing is a metal forming process in which a force is applied to a piece of sheet metal,causing it to bend at an angle and form the desired shape.折弯是施力使金属板弯曲成一定的角度并形成预期形状 的金属板成形过程。The act of bending results in both tension and compression in the sheet metal.折弯在钣金中同时产生伸张和压缩。,Sheetmetal forming(钣金成型),Whe

6、n bending a piece of sheet metal,the residual stress in the material will cause the sheet to spring-back slightly after bending operation.钣金折弯时，材料内的残余应力会使钣金在折弯后有轻 微的反弹。Deep drawn parts are characterized by a depth equal to more than half of the diameter of the part.拉伸成形零件的特征是深度大于半径。,Sheetmetal formi

7、ng(钣金成型),Sheetmetal Cutting(钣金切割),When a great enough shearing force is applied,the shear stress in the material will exceed the ultimate shear strength and the material will fail and separate at the cut location.当施加一个足够大的剪切力时，材料的剪切应力超过剪 切强度，这时材料就会从切口分离。,Sheetmetal Cutting(钣金切割),Shearing is primaril

8、y used to cut sheet stock into smaller sizes in preparation for other processes.剪切主要是将片材分割成小块，为其他工序做准备。In this process,the piece removed,called the blank,is not scrap but rather the desired part.在该操作中，被移走的材料称为坯料，是期望得到的部 分而不是废料。,Sheetmetal Cutting(钣金切割),Punching is very similar to blanking except tha

9、t the removed material,called the slug,is scrap and leaves behind the desired internal feature in the sheet,such as a hole or slot.冲裁和下料非常的相似，只不过被移除的金属小块的是 废料，而在片材上留下所期望的内部特征，例如孔或槽。,Sheetmetal Working(钣金加工),punchingblankingpress brakebending machineshear machinefailductileclearance,冲孔下料弯板机折弯机剪板机失效可拉

10、长的，可延展的间隙,Sheetmetal Working(钣金加工),parameterelastic deformationplastic deformationneutral axisspring-backshear strengthbendingshearing,参数弹性变形塑性变形中性轴反弹剪切强度折弯剪切,Sheetmetal Working(钣金加工),sheet metalsheetmetal workingbrasscopperbronzestainless steellow carbon steelcarbide steel,钣金钣金加工黄铜红铜青铜不锈钢低碳钢硬质合金钢,Q

11、&A(问答),Sheetmetal thickness is usually 0.15-6mm。Bending only results in tension in the sheetmetal.What cause the spring-back after bending?Custom tooling cost is low.Wipe bending and edge bending are different.Shearing is used to cut sheet stock into smaller sizes.In most shear machine,the upper bla

12、de remains stationary.Part after fine blankingrequires secondary operation.,Exercise Analysis(习题分析),1.参考第61页第二段。在下料过程中，被移走的成为坯 料，不是废料而是想要保留的部分。A,轿壁由钣金构成，主要通过折弯方式制作。,参考第55页第四段。折弯在钣金中同时产生拉伸和压缩。,参考第55页第一段。1in=25.4mm。,2.C 3.B4.C,Exercise Analysis(习题分析),参考第58页第一段。B参考第60页第二段。剪切用于将片材切割成小块用于其 他制程。A参考第61页第一段。大多数剪板机的上刀刃向下运动。C参考第61页第一段。精下料的零件不需要二次加工。A,Exercise Analysis(习题分析),参考第60页第三段。上下刀具之间的间隙是料厚的210%。B参考第61页第四段。C,感谢您的关注,