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一些模具基礎知識及中英模具名詞對照
· Standard Molding Equipment 標準成型設備
o Machine Type 機台形態
o Machine Size 機台大小
· Molding Conditions成型條件
o Drying 烘乾
o Barrel Temperature 料管溫度
o Melt Temperature 熔化溫度
o Mold Temperature 模具溫度
o Injection Pressure 射出壓力
o Back Pressure 背壓
o Injection Speed 射出速度
o Screw RPM 螺桿轉速
· General Processing Tips 一般操作秘訣
o Compounds with Fillers 含填充物的複合材料
o Compounds with Fibers 含纖維的複合材料
· Tips to Improve Mechanical Properties 改善機械特性的秘訣
o Tensile Strength 抗拉強度
o Tensile Elongation 延伸率
o Flexural Modulus彎曲模數
o Flexural Strength 抗彎強度
o Notched IZOD Impact 有缺口衝擊
o Shrinkage 收縮率
o Warpage 翹曲
o Regrind Usage 次料使用
· Tips to Improve Surface Conductivity 改善表面導電度的秘訣
o Compounds with Conductive Fillers 含導電填充物的複合材料
o Compounds with Conductive Fibers含導電纖維的複合材料
· Long Fiber Compounds Molding Guidelines 長纖維成型指南
· Foam Concentrates Molding Guidelines 發泡母料成型指南
· Mold Design 模具設計
射出的模具必須被適當的設計以確保塑膠零件的品質。 模具設計會衝擊到成型作業的生產率和利潤。 本章節提供設計有效率射出模具的指南。
Injection molds must be properly designed to ensure quality plastic components. Mold design impacts productivity and profitablity of your molding operation. This section offers guidelines for designing an effcient injection mold.
o Sprue/Cold Material Trap 澆道/冷料井
§ Sprue Puller 澆道拉桿
§ Cold Material Trap 冷料井
o Runner Design 流道設計
§ Main Runner 主流道
§ Secondary Runner 次流道
o Gate Design 射口設計
§ Submarine or Tunnel Gate 潛艇或隧道射口
§ Pinpoint or Restricted Gate 針點或受限射口
§ Fan or Edge Gate 扇形或邊緣射口
§ Tab Gate 側翼射口
§ Sprue Gate 澆道射口
§ Flash Gate 毛邊射口
§ External Ring Gate 外部的環形射口
§ Internal Ring Gate 內部的環形射口
o Thick to Thin Wall Gating 厚壁到薄壁射口
o Adjoining Walls 鄰接壁
o Ribs 補強肋
§ Rib Details 補強肋細節
§ Boss or Rib 凸起或補強肋
§ Support Ribs 支撐補強肋
o Bosses Gussets 凸出物及角板
§ Free Standing Boss (4 Gusset) 自由固定凸出物(四角板)
§ Free Standing Boss (2 Gusset) 自由固定凸出物(二角板)
o Two Plate Mold 兩板模
o Three Plate Mold 三板模
o Insulated Runner Mold 絕熱(保溫)流道模具
o Venting Cooling Design 排氣或冷卻設計
§ Cooling Ejector Pins 冷卻及脫模頂針
§ Venting 排氣
o Living Hinge Design 活動折葉設計
Injection Speed 射出速度 1-2 in/sec (25-50 mm/sec)
Screw Speed 螺桿轉速 60-90 rpm
Standard Molding Equipment標準成型裝置
· Machine Type機台型態
RTP公司建議使用螺桿射出機台用於成型補強的熱塑性塑膠。 螺桿射出機台可以改善熔化的均一性,降低成型零件的變異性,並且能將熔融聚合物的裂解和冷料點減低到最小。
We recommend using a screw injection machine for molding reinforced thermoplastics. A screw injection machine improves melt homogeneity, reduces variations in the molded parts, and minimizes degradations and cold spots of the polymer melt.
· Machine Size機台大小
機台大小應適合於每射一模的容量大約佔機台料管總容量的50-70%。 此合適的機台才可維持材料在料管內有短的滯留時間以避免材料的裂解。 機台也應有每平方英吋零件投影面積4-8噸(55-110牛噸/mm2)的夾模壓力(瑣模力)。 一般而言,補強材料的夾模壓力(瑣模力)需要比相同塑膠形態的未補強材料的夾模壓力(瑣模力)大50-70%。
The machine should be sized to use approximately 50-70% of machine barrel capacity per shot. This maintains a short barrel residence time and eliminates material degradation. The machine should have adequate clamp pressure to obtain 4-8 tons per square inch (55-110 newtons per mm2) of projected surface area. Generally, a reinforced material requires 50-70% higher clamping pressures than a nonreinforced polymer of the same type.
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Molding Conditions成型條件
· Drying烘乾
成功的補強熱塑性塑膠的成型需要適當的烘乾。 不適當的烘乾可能造成極不穩定的成型條件和不盡完美的成型零件。 過度潮濕的材料在成型中會排出煙氣並且可能會改變材料的黏度。 此現象會造成易裂,脫皮,氣泡,銀條紋和差的表面光澤。 RTP公司材料在包裝入防濕容器之前有預先烘乾。 但是,RTP建議在成型之前仍要用除濕烘乾機將材料完全的烘乾。 材料的預先烘乾不但對濕度敏感的材料很重要而且對非濕度敏感的材料也是必要的。 凝結在塑膠顆粒表面的濕氣會明顯地影響高溫成型零件。 本網站的成型條件區所建議的烘乾時間可做為材料烘乾的指南;但是,實際濕氣含量的檢查是必須的。
Successful molding of reinforced thermoplastics requires adequate drying. Inadequate drying can cause extremely erratic molding conditions and less than perfect molded parts. Excessively wet materials outgas and can undergo a viscosity change during processing. This may cause brittleness, blisters, voids, silver streaking and poor surface finish. RTP Company materials are dried prior to packaging in moisture resistant containers. However, we recommend thoroughly drying the materials in a dehumidifying type dryer. This is important with hygroscopic materials but can also be essential for non-hygroscopic materials. Condensed surface moisture can dramatically affect high temperature molded parts. The recommended drying times in Processing Conditions section of this web site are provided as guidelines; however, an actual moisture check is necessary.
· Barrel Temperature料管溫度
參照在網站上建議的成型條件區作為建議的起始溫度。 通常後段及後面各區段的設定溫度比前段噴嘴的設定溫度低10-20℉(6-12℃)。 依照零件的尺寸和結構而做一些溫度的調整可能是必須的。
Refer to Processing Conditions section of this web site for recommended starting temperatures. Typically the rear zone/zones are set 10-20 degrees F (6-12 degrees C) cooler than the front zone and nozzle. Some modifications may be needed depending on part size and configuration.
· Melt Temperature熔化溫度
參照本網站的成型條件區作為建議的起始溫度。
Refer Processing Conditions section of this web site for recommended starting temperatures.
· Mold Temperature模具溫度
參照本網站的成型條件區做為建議的起始溫度。 通常,補強的材料需要比沒有補強的材料有較高的模溫。 較高的模溫會達到較光滑的,更無瑕疵的表面因為補強材料的成型零件會有豐富的表層。
Refer Processing Conditions section of this web site for recommended starting temperatures. Normally, reinforced materials require higher mold temperatures than nonreinforced materials. Higher mold temperatures will achieve a smoother, more blemish-free surface by providing a resin rich skin on reinforced materials.
· Injection Pressure射出壓力
一開始應設定低的射出壓力以填充零件至剛好不會造成毛邊。 最大的壓力而沒有毛邊會造成使用的RTP公司材料有最適當的物理特性。
Injection pressure should be set low initially and increased to the point of filling the part just short of causing flash. Maximum pressure without flash generates optimum physical properties for your RTP Company material.
· Back Pressure背壓
低背壓(約50psi或0.34 MPa)會使纖維絞斷和物性劣化的情況降到最低。
Low back pressure (approx. 50 psi or 0.34 MPa) minimizes fiber breakage and property deterioration.
· Injection Speed射出速度
一般地,盡可能地快速填滿模穴是最好的。 這樣可以使纖維配向降到最低而且有最佳的熔接線一致性。
Generally, the fastest possible cavity fill time is best. This minimizes glass orientation and maximizes weld line integrity.
· Screw RPM螺桿轉速
建議用盡可能低的螺桿轉速以減小纖維的絞斷和螺桿鬆退應據此設定。 較低的螺桿轉速會由於最小的剪熱而導致更均勻的熔化。
The lowest possible rpm is recommended to minimize fiber breakage and screw recovery should be set accordingly. Slower rpm's result in a more uniform melt by minimizing shear heat buildup.
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