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        當前位置:首頁>新聞中心>新聞動態>注塑模具開裂、裂紋、微裂、發白是什么原因

        注塑模具開裂、裂紋、微裂、發白是什么原因

        來源:http://www.environmentandpeople.net/ 日期:2022-05-23 發布人:guanli


        1、注塑機塑化容量要恰當,過小塑化不充分未能完全混合而變脆,過大時會降解。
        1. The plasticizing capacity of the injection molding machine should be appropriate. If it is too small, the plasticizing is not sufficient, it cannot be fully mixed and becomes brittle. If it is too large, it will degrade.
        2、模具方面:
        2. Mold:
        (1)頂出要平衡,如頂桿數量、截面積要滿足,脫模斜度要滿足,型腔面要有滿足光滑,這樣才避免因為外力導致頂出剩余應力集中而開裂。
        (1) The ejection shall be balanced, such as the number and cross-sectional area of ejector rods, the demoulding slope, and the cavity surface shall be smooth, so as to avoid cracking due to the concentration of residual stress caused by external force.
        (2)制件結構不能太薄,過渡部份應盡量選用圓弧過渡,避免尖角、倒角構成應力集中。
        (2) The workpiece structure shall not be too thin, and the transition part shall adopt circular arc transition as far as possible to avoid stress concentration caused by sharp corners and chamfers.
        (3)干流道襯套與噴嘴接合應當避免冷硬料的遷延而使制件粘在定模上。
        (3) When the dry runner bushing is connected with the nozzle, the extension of cold and hard materials should be avoided to make the workpiece stick to the fixed die.
        (4)盡量少用金屬嵌件,以避免嵌件與制件收縮率不同構成內應力加大。
        (4) Metal inserts shall be used as little as possible to avoid the increase of internal stress caused by different shrinkage between inserts and products.
        (5)對深底制件應設置恰當的脫模進氣孔道,避免構成真空負壓。
        (5) Proper demoulding air inlet duct shall be set for deep bottom parts to avoid forming vacuum negative pressure.
        (6)干流道滿足大使澆口料未來得及固化時脫模,這樣易于脫模。
        (6) The dry runner can be demoulded before the gate material is cured, so it is easy to demould.
        (7)流道和澆口太小,在模具填充中產生過度的剪切率,運用全圓流道并添加流道和澆口的尺寸以便在模具填充階段供給可接受的剪切率。
        (7) The runner and gate are too small to produce excessive shear rate in mold filling. Use full circle runner and add the size of runner and gate to provide acceptable shear rate in mold filling stage.
        3、工藝方面:
        3. Process:
        (1)打針壓力過大、速度過快、充料愈多、打針、保壓時間過長,都會構成內應力過大而開裂。
        (1) If the injection pressure is too high, the injection speed is too fast, the more materials are filled, and the injection and pressure holding time is too long, it will lead to excessive internal stress and cracking.
        (2)恰當調高模具溫度,限制冷卻體流過模具的速度,使制件易于脫模,塑料在射料缸內降解,引起塑料分子結構的破裂,在所有區域下降射料缸溫度,下降壓背,運用排氣的射料缸保證排出孔正確運轉且每個孔設定正確溫度。
        (2) Properly raise the mold temperature, limit the speed of the cooling body flowing through the mold, so that the parts are easy to demould, the plastic is degraded in the injection cylinder, causing the rupture of the plastic molecular structure, reduce the injection cylinder temperature in all areas, lower the pressure back, and use the exhaust injection cylinder to ensure the correct operation of the discharge hole and set the correct temperature for each hole.
        (3)開模速度與壓力避免快速強拉制件構成脫模開裂。
        (3) The mold opening speed and pressure shall avoid demoulding and cracking caused by rapid forced drawing.
        (4)恰當運用脫模劑,留意常常模面附著的氣霧等物質。
        (4) Properly use the release agent and pay attention to the aerosol and other substances often attached to the mold surface.
        (5)防備因為熔接痕,塑料降解構成機械強度變低而呈現開裂。
        (5) Prevent cracking due to weld marks and degradation of plastics, resulting in lower mechanical strength.
        (6)熔膠溫度太低,在射料缸上給后區和射咀增溫,下降螺桿速度或高速轉以獲得正確的螺桿表面速度。
        (6) If the melt temperature is too low, increase the temperature of the rear area and nozzle on the injection cylinder, reduce the screw speed or rotate at high speed to obtain the correct screw surface speed.
        (7)模具填充速度太慢,添加注塑速度;在注塑機上保持穩定的墊料。
        (7) The mold filling speed is too slow and the injection molding speed is too slow; Maintain stable padding on the injection molding machine.
        (8)制件剩余應力,可通過在成型后當即進行退火熱處理來內應力而削減裂紋的生成。
        (8) The residual stress of parts can be reduced by annealing heat treatment immediately after forming to reduce the internal stress and reduce the formation of cracks.
        (9)注塑件的壓力沒有恰當的釋放出來或沒有處理,將打針塑件退火,若是尼龍塑料產品,將其浸入溫水中。
        (9) If the pressure of injection molded parts is not properly released or treated, anneal the injection molded parts. If it is nylon plastic products, immerse them in warm water.
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