压铸模流道与浇口设计

Castec
鑄件形狀並未考慮

Casting shape is not taken into account
AUSTRALIA
充填模式法 (Fill Pattern based approach)
決定充填模式 Define fill pattern 設計流道&澆口 Design runner & gate
充填模式達到?
Fill pattern achieved?
No
分析 (Analyze)
No
Castec
OK?
Yes
AUSTRALIA
什麼是“充填模式”?
What is fill pattern?
Castec
AUSTRALIA
怎樣才是好的充填模式 ?
What is a good fill pattern?
Mechanical features: die layout & parting face
流動特性:

流道&澆口
冷卻&加熱
Fluid flow features: runner and gate
熱流特性:

Thermal features: cooling & heating
Castec
AUSTRALIA
Gate area (A = F/u)
AUSTRALIA
計算澆口面積
Calculate the gate area
150 100
1
?
Castec
AUSTRALIA
充填時間法則之缺點
Weaknesses of Fill Time based approach:
最佳充填時間無法肯定

Optimum cavity fill time is unknown
模具設計電腦輔助工具
Computer-Aided die design tools
機械性:

Autocad, Unigraphics
CASTFLOW CASTHERM
Mechanical features: Autocad, Unigraphics
流動特性:

Fluid flow features: CASTFLOW
在

MS-WINDOWS 環境下操作
Operate under MS-WINDOWS
由CASTEC作全球性行銷

Marketed worldwide by Castec Australia
Castec
AUSTRALIA
模具設計的特性
Die Design Features 機械特性:

模具分佈&各部界面
熱流特性:

Thermal features: CASTHERM
Castec
AUSTRALIA
模具設計之整合
Integrated Die Design
模具設計
Die Design
流道設計:
CASTFLOW
Runner Design
冷卻&加熱
IGES
Cooling/Heating CASTHERM
充填時間法則

Fill time based
充填模式法則

Fill pattern based
Castec
AUSTRALIA
充填時間法則之流程
Fill time based procedure
決定充填時間

(=t)
(=V) (F=V/t)
Determine the cavity fill time (= t)
NC 加工
Castec
NC Machining
AUSTRALIA
課程主題
Topics 流道&澆口設計之流程

Runner and gating design procedures
充填模式分析

Fill pattern analysis
電腦軟體CASTFLOW

CASTFLOW
Case
計算鑄件體積

Calculate the casting volume (= V)
計算金屬熔液湯流率

Calculate metal flow rate (F=V/t)
指定澆口速度

Castec
(u>40m/s)
Assign gate speed (u > 40 m/s)
澆口面積

(A=F/u)
流道與澆口設計系統
Designing Runner and Gating Systems
T.H. Siauw
Castec
Castec Australia Pty. Ltd.
AUSTRALIA
產品背景
Product background 經過CSIRO的15年研發

Over 15 years R&D by CSIRO
包夾空氣 Air trap
Castec
避免兩道或多道金屬流在模穴中會合而包夾空氣 Avoid two or more metal fronts meeting in cavity which trap air
AUSTRALIA
Castec
AUSTRALIA
Good Fill Pattern?
?
Castec
流道形狀的影響並未考慮

The effect of runner geometry is not taken into account
模穴充填距離並未考慮,
故澆口位置只
能純憑經驗.

The flow distance in cavity is not taken into account. Thus, gate position must be decided purely by experience
Castec
扇形開口 Fan/Chisel Gate
錐形流道 Tapered runner
AUSTRALIA
請試描出下面兩種澆口 的射出方向 ?
Exercise show the likely flow direction as the metal flows out of the gate
Castec
Castec
應避免鎂湯在模穴中旋轉形成旋渦而包夾空氣 Avoid metal swirling in cavity forming vortices which trap air
AUSTRALIA
Castec
AUSTRALIA
怎樣才是好的充填模式 ?
What is a good fill pattern?
決定充填模式 Define fill pattern
設計流道&澆口 Design runner & gate
充填模式達到?
Fill pattern achieved?
No
分析 Analyze
No
Castec
OK?
Yes
AUSTRALIA
哪一種流道形狀好 ?
Which runner geometry?
扇形開口 Fan/Chisel Gate
錐形流道 Tapered runner
AUSTRALIA
任何問題 ? Any questions?
Castec
AUSTRALIA
先休息一下 ? Let us have a break
Castec
AUSTRALIA

Castec
studies
Case studies
AUSTRALIA
問題在哪?
The problem
?
Castec
AUSTRALIA
流道&澆Hale Waihona Puke Baidu設計之流程
Runner and Gating Design Procedures 大姆指法則-經驗公式

Rule of thumb - experience based
Some geometrical features in casting may interrupt flow and cause metal fronts meet in cavity
AUSTRALIA
決定充填模式後,下一步是…..
After defining fill pattern the next is ...
Avoids metal fronts meeting in cavity
AUSTRALIA
Castec
AUSTRALIA
Castec
AUSTRALIA
怎樣才是好的充填模式 ?
What is a good fill pattern? 空洞 Cutout 包夾空氣 air trap
Castec
某些特殊形狀的鑄件會影響金屬流動與 引起金屬在模穴中會合