•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.
Assembly and setup of main dies • Types of Die Design 模具设计的类型
Solid Main Die 实心主模
Step Solid Main Die 台阶实心主模
Die-Piece / Casing / Insert
套片整装主模
Step Die-Piece / Casing / Insert
生产良好的冷锻件， 操作者需要 具备: 纪律, 技能, 知识和持之以 恒的进取精神。
Assembly and setup of main dies • Materials for Die Construction 模具的材质
Hot Work Steel 耐热钢
Carbide Insert 钨钢
High Speed Steel 高速钢
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
6. Big Roll-over: clearance too big and Tool worn off 曲面大: 间隙太小/ 模具磨损
Assembly and setup of COD & COK 7 Understand Defects 缺陷分析
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硬材料
• 间隙较小 • 剪切面较好 • 刀口易磨损 • 钨钢易破损
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
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
3. Tongue: small clearance and no tool relief 舌状毛刺: 间隙太小/ 没有表面退让
4. Bent Blank: COK/COD diameter too big 线材弯曲: 剪刀/ 剪体内孔直径太大
5. Oval Shape: COK/COD diameter too big 椭圆形: 剪刀/ 剪体内孔直径太大
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
对齐困难
Short Die-piece Life
套片寿命短
High Cost
成本昂贵
The REASON for different die designs 不同模具设计的成因
Normal Cost
成本一般
Easy Assemble
组装简易
Tool Life Shorter
模具寿命较短
Some Assembly Problem
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
Assembly and setup of COD & COK
7 Understand Defects 缺陷分析
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1. Poor Sheared Surface: small clearance and no tool relief 剪切面粗糙: 间隙太小/ 没有表面退让
2. Burr: COK or/and COD worn off 毛刺: 剪刀/ 剪体磨损
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成本源自廉6. Easy to Setup
安装简易
7. Long Tool Life
某些组装问题
Difficult to Alignment
对齐困难
Short Die-piece Life
套片寿命短
Very High Cost
成本最昂贵
Assembly and setup of main dies
• Importance of Die Surface Finishing
模具表面加工的重要性
台阶套片整装主模
Assembly and setup of main dies • Types of Die Design 模具设计的类型
Low Cost
成本低廉
Easy Assemble
组装简易
Long Tool Life
模具寿命长久
Some Assembly Problem
某些组装问题
Difficult to Alignment
10 Jan 2011
1. Assembly and setup of COD & COK 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
模具尖角太锋利造成模具脆裂或破损
Assembly and setup of main dies • Compressive Stress 压应力
0.5% hot-shrinkfit interference 0.5% 预热组合的 过盈配合量
0.5% taper press interference 0.5% 斜角部分的过 盈配合量
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
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
延长模具寿命
0.5% cold press interference 0.5% 冷装组合过盈配合量
Assembly and setup of main dies
• Good Die Assembly 正确组装模具
Sufficient chamfer 足够的倒角
Proper installation of die piece
软材料
•间隙较大 •剪切面难控制 •要退让曹 •材料易弯
2. Assembly and setup of main dies
主模组立
Assembly and setup of main dies
• Basic of Cold Forming 冷锻的基础知识
• Materials for Die Construction 模具的材质
• Grinding marks promote cracks
模具研磨纹路造成脆裂
• Rough surfaces promote galling
粗糙的表面造成表面磨伤