极品冷镦模具设计12760.pptx

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1、Contents of the Training 培训内容 Assembly and setup of COD&COK 剪刀/剪模组立 Assembly and setup of main dies 主模组立 Assembly and setup of punches 冲头组立/失效分析 Understand steel&carbide tools 模具组立/材料/钨钢 Understand tool surface&friction 模具表面/摩擦系数 Understand the effect of preform 预成形分析10 Jan 20111.Assembly and setup

2、of COD&COK2.剪刀/剪模组立Assembly and setup of COD&COK1 Types of Shearing 剪切类型Half Cutter COK/Complete COD半剪Complete COK/Complete COD全剪COK:Cut Off Knife 剪刀COD:Cut Off Die 剪体Assembly and setup of COD&COK2 Basic Mechanism of Shearing剪切基础知识What Happen During Shearing:-剪切过程产生：1.Elastic Deformation 弹性变形2.Roll-

3、over 曲面3.Plastic shear 塑性剪切4.Initial Fracture 初始断裂5.Final Fracture 最终断裂6.Physical Separation 实际剪断Assembly and setup of COD&COK2 Basic Mechanism of ShearingQuality Problems:-质量问题1.Oval Shape 椭圆形 2.Tilting 歪斜3.Poor shear 剪切面粗糙4.Burr 毛刺5.Not Straight 不直Clearance Too Big间隙太大Optimum Clearance最佳间隙Clearanc

4、e Too Small间隙太小1.Elastic Deformation 弹性变形2.Roll-over 曲面3.Plastic shear 塑性剪切4.Initial Fracture 初始断裂5.Final Fracture 最终断裂6.Physical Separation 实际剪断Assembly and setup of COD&COK2 Basic Mechanism of Shearing(Half Cut COK)半剪1.No Control of Blank 落料无法控制 2.Different Shear Patterns 剪切方式不同3.Blank Not Straigh

5、t 线材不直4.Big Roll-over 曲面较大 5.Low Cost 成本低廉6.Easy to Setup 安装简易7.Long Tool Life 模具寿命较长Assembly and setup of COD&COK2 Basic Mechanism of Shearing1.Need Relief Surfaces 需要表面退让（退剪槽2.Careful Control of Clearance 间隙要求高3.Difficult COK/COD Alignment 剪刀、剪体对齐困难4.Better Shear/Quality 较好的剪切质量5.Achieve Straight

6、Blank 剪断的线材较直6.Small Roll-over 曲面小(Complete Cut 全剪)Assembly and setup of COD&COK3 Common Blank Quality Issue常见的线材剪切质量问题1.Roll-over 曲面2.Plastic shear 塑性剪切3.Secondary Fracture/Tongue 二次断裂/舌状毛刺4.Burr 毛刺5.Straightness 直线性1443234Assembly and setup of COD&COK4 COD&COK Setting 安装Relief表面退让（退剪槽Small Radius小

7、圆角 Relief表面退让（退剪槽Assembly and setup of COD&COK5 COD&COK Materials 材料Tool Steel模具钢Carbide钨钢Assembly and setup of COD&COK6 Main Process Parameters 主要参数1.Material Hardness 材料硬度2.COK/COD Clearance 剪刀/剪体间隙3.COK/COD Diameters 剪刀/剪体内孔直径4.COK Speed 剪刀速度5.Lubricants 润滑6.Types of COK 剪刀类型Harder materials need bigger clearance,more tool relief&higher speed 当剪切较硬的线材时,需要更多的间隙,表面退让(退剪槽)和更快的速度.Too loose the COD/COK diameters will bend the blank and cause taper ends 剪刀/剪体的内孔直径太大时,会造成线材弯曲,线材末端缩小.Shearing without lubricants causes short tool life 无润滑剪切会缩短模具寿命.