极品冷镦模具设计.pptx

1. No Control of Blank 落料无法控制
2. Different Shear Patterns 剪切方式不同
3. Blank Not Straight
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
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
Clearance Too Small 间隙太小
Optimum Clearance
最佳间隙 Quality 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
Assembly and setup of COD & COK 2 Basic Mechanism of Shearing (Half Cut COK) 半剪
Half Cutter COK / Complete COD Complete COK / Complete COD
半剪
全剪
Assembly and setup of COD & COK
2 Basic Mechanism of Shearing 剪切基础知识
What Happen During Shearing:剪切过程产生：
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 Blank
剪断的线材较直
6. Small Roll-over
曲面小
Assembly and setup of COD & COK
模具寿命较长
Assembly and setup of COD & COK
2 Basic Mechanism of Shearing (Complete Cut 全剪)
1. Need Relief Surfaces
需要表面退让（退剪槽〕
2. Careful Control of Clearance 间隙要求高
Tool Steel 模具钢 Carbide 钨钢
Assembly and setup of COD & COK
6 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
10 Jan 2011
1. Assembly and setup of COD & COK 2. 剪刀/剪模组立
Assembly and setup of COD & COK
1 Types of Shearing 剪切类型 COK: Cut Off Knife 剪刀 COD: Cut Off Die 剪体
3 Common Blank Quality Issue
常见的线材剪切质量问题
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2
3 4
1. Roll-over 2. Plastic shear 3. Secondary Fracture / Tongue 4. Burr 5. Straightness
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3Байду номын сангаас
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曲面 塑性剪切 二次断裂 / 舌状毛刺 毛刺 直线性
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 & COK 2 Basic Mechanism of Shearing
•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.
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
Clearance Too Big 间隙太大
Assembly and setup of COD & COK 7 Understand Defects 缺陷分析
Assembly and setup of COD & COK
4 COD & COK Setting 安装
Relief 表面退让 （退剪槽〕
Small Radius 小圆角
Relief 表面退让 （退剪槽〕
Assembly and setup of COD & COK 5 COD & COK Materials 材料
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.