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如何解決塑料模具生產時出現的翹曲變形?

來源:http://www.gvyuft.buzz     發布時間:2020-07-03 17:31:04    點擊:

  塑料模具會出現翹曲現象的解決方法 ,我們一般增加保壓,延長冷卻時間來解決,,當然一人有一些產品本身就容易變形的,是很難控制的,調機工藝要非常高SINO還可以在修改產品增加加強筋來解決。
  To solve the problem of warpage in plastic mold, we usually increase the pressure holding and extend the cooling time to solve this problem. Of course, if one person has some products, it is easy to deform, which is very difficult to control. The adjustment process should be very high, and the Sino can also be solved by adding reinforcing ribs in the modified products.
  由于塑料成型時流動方向的收縮率比垂直方向的大,使制件各向收縮率不同而翹曲,又由于注射充模時不可避免地在制件內部殘留有較大的內應力而引起翹曲,這些都是高應力取向造成的變形的表現。所以從根本上說,設計決定了制件的翹曲傾向,要通過變更成型條件來抑制這種傾向是十分困難的,更終解決問題必須從模具設計和改良著手。濟南模具為您具體分析如下:
  Because the shrinkage rate in the flow direction is larger than that in the vertical direction, the parts will warp due to different shrinkage rates in each direction, and the warpage will inevitably be caused by the residual internal stress in the parts during the injection filling process. These are the manifestations of deformation caused by high stress orientation. Therefore, fundamentally speaking, the design determines the warpage tendency of parts. It is very difficult to restrain this tendency by changing the forming conditions. The final solution to the problem must start with the mold design and improvement. Jinan mold for your specific analysis as follows:
  一.模具方面:
  1、 Mold aspect:
  1.制件的厚度、質量要均勻。
  1. The thickness and quality of the products should be uniform.
  2.冷卻系統的設計要使模具型腔各部分溫度均勻,澆注系統要使料流對稱避免因流動方向、收縮率不同而造成翹曲,適當加粗較難成型部份的分流道、主流道,盡量消除型腔內的密度差、壓力差、溫度差。
  2. The design of the cooling system should make the temperature of each part of the mold cavity uniform, the gating system should make the material flow symmetrical, avoid warping due to the different flow direction and shrinkage rate, appropriately thicken the shunt channel and main channel of the difficult part, and try to eliminate the density difference, pressure difference and temperature difference in the mold cavity.
  3.制件厚薄的過渡區及轉角要足夠圓滑,要有良好的脫模性,如增加脫模余度,改善模面的拋光,頂出系統要保持平衡。
  3. The transition zone and corner of the workpiece thickness should be smooth enough and have good demoulding performance. For example, increase the stripping redundancy, improve the polishing of the die surface, and keep the ejection system balanced.
  4.排氣要良好。
  4. Exhaust well.
  5.增加制件壁厚或增加抗翹曲方向,由加強筋來增強制件抗翹曲能力。
  5. By increasing the wall thickness or increasing the anti warping direction, the anti warping ability of the part can be enhanced by reinforcing rib.
  6.模具所用的材料強度不足。
  6. The strength of the material used in the mould is insufficient.
                                   濟南模具
  二.塑料方面:
  2、 For Plastics:
  結晶型比非結晶型塑料出現的翹曲變形機會多,加之結晶型塑料可利用結晶度隨冷卻速度增大而降低,收縮率變小的結晶過程來矯正翹曲變形。
  In addition, the crystallized plastics can use the crystallization process that the crystallinity decreases with the increase of cooling rate and the shrinkage rate decreases to correct the warpage deformation.
  三.加工方面:
  3、 Processing:
  1.注射壓力太高,保壓時間太長,熔料溫度太低速度太快會造成內應力增加而出現翹曲變形。
  1. If the injection pressure is too high, the holding time is too long, the melting temperature is too low and the speed is too fast, the internal stress will increase and the warpage will appear.
  2.模具溫度過高,冷卻時間過短,使脫模時的制件過熱而出現頂出變形。
  2. The mold temperature is too high and the cooling time is too short, so that the parts are overheated and the ejection deformation occurs.
  3.在保持限度充料量下減少螺桿轉速和背壓降低密度來限制內應力的產生。
  3. Reduce the screw speed and back pressure and reduce the density to limit the internal stress while keeping the minimum charge.
  4.必要時可對容易翹曲變形的制件進行模具軟性定形或脫模后進行退米處理。
  4. If necessary, soft setting or demoulding can be carried out for the parts which are easy to warp and deform.
  以上是關于解決塑料模具生產時出現的翹曲變形的方法介紹,希望對您有所幫助,想要了解更多內容歡迎咨詢濟南模具http://www.gvyuft.buzz官網。
  The above is about the solution of plastic mold production warpage deformation method introduction, hope to help you, want to know more content, welcome to consult Jinan mold http://www.gvyuft.buzz Official website.
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