射出問題和解決對策(2)

和興交通工程有限公司

射出問題和解決對策(2)

 

射出問題與解決對策(2)

. Sprue sticking 澆道 (水口) 黏模

During injection, sprue gets sticking, the sprue cannot fall off when the mold is opened.

注塑時,澆道粘連,開模時澆道不能脫落。

Possible Cause

Correction action

Injection pressure too high
射出壓力太高

Reduce injection pressures 降低射出壓力

Melt material temperature too high
料溫太高

Reduce material melt temperature 降低料溫

Sprue diameter too long
澆道過大

Modify the mold 修改模具

Not enough sprue cooling time
澆道冷卻時間不夠

1. Add cooling time 延長冷卻時間
2. Reduce barrel temperature 降低料管溫度

Draft angle too small
澆道脫模角不夠

Increase angle 修改模具增加角度

Sprue bushing and nozzle dismatched
澆道凹弧與射嘴之配合不正

Adjust to match 重新調整與配合

Sprue surface not smooth
澆道內表面不光滑

Maintain the mold 檢修模具

Undercuts 脫模倒角

Maintain the mold 檢修模具

Damage sprue
澆道外孔有損壞

Maintain the mold 檢修模具

No sprue puller pin
無澆道抓鎖

Add sprue puller pin 加設抓銷

Over filling
填料過飽 

1. Reduce injection volume 降低射出量

2. Shorten injection time 減短射出時間

3. Slow injection speed 降低射出速度

 

. Flash 毛頭(毛邊) 、披風

When melt plastic flows out of the cavity at the parting line or between inserts,

excess are formed on surface of molded product

當熔融塑料在分型線或嵌件之間流出型腔時,成型品表面形成多餘的料邊

Possible Cause

Correction action

Melt plastic temperature too high
原料溫度太高

1. Reduce melt temperature 降低原料溫度

2. Reduce mold temperature 降低模具溫度

Injection pressure too high
射出壓力太高

Reduce injection pressure 降低射出壓力

Filling too much
填料過飽

1. Reduce injection volume 降低射出量

2. Shorten injection time 減短射出時間

3. Slow injection speed 降低射出速度

Poor melding line or bad sealing surface
合模線或靠密面不良

Maintain the mold 檢修模具

Low clamping pressure
鎖模壓力不夠

Raise clamping pressure 增加鎖模壓力

Hold pressure too long
保壓時間過長

Reduce hold pressure time 減少保壓時間

Injection speed too fast
射出速度過快

Slow injection speed 降低射出速度

Melt plastic flow too fast
塑膠原料流動性太好

Change plastic 更換原料

 

. Cracking or Crazing 開模時或頂出時成品破裂

A breakage occurs when the mold is opened or product is ejected

開模或頂出產品時發生破損

Possible Cause

Correction action

Overfeed material
填料過於飽和

1. Reduce shot volume 降低射出量

2. Reduce injection time 減短射出時間

3. Reduce injection time 降低射出速度

4. Reduce enjection pressure 降低射出壓力

Hold pressure too long
保壓時間太長

減少保壓時間

Mold temperature too high
模溫太低

升高模溫

Insufficient draft allowance
脫模斜度不足

Check the mold 檢修模具

Gate diameter too small
澆口太小

Check the mold 檢修模具

Ejector pin too small or wrong position
頂針不夠或位置不當

Check the mold 檢修模具

Mold Undercuts
模具有倒鉤

Check the mold 檢修模具

Excessive Moisture in material
材料吸濕性良好

1. Dry material 進行烘料

2. Change plastic material 更換塑膠原料

Vacuum occurs when mold is drafted
脫模時模具產生真空現象

1. Slow to open mold or reduce eject speed 降低開啟模具或頂出的速度

2. Use intake equipment 使用進氣設備