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注塑加工中關于開裂的分析

來源:http://www.giulya.com 日期:2021-04-22 發布人:liqiang 瀏覽次數:
A、加工技術:

A. Processing technology:

1、加工壓力過大、速度過快、充料愈多、注射、保壓時間過長,都會造成內應力過大而開裂;

1. The process pressure is too large, the speed is too fast, the filling is more, the injection and pressure holding time is too long, which will cause the internal stress to be too large and crack;

2、調節開模速度與壓力防止快速強拉制件造成脫模開裂;

2. Adjust the opening speed and pressure to prevent the release cracking caused by the rapid strong pulling parts;

3、注射壓力太低或者注射速度過快;

3. The injection pressure is too low or the injection speed is too fast;

4、預防由于熔接痕,塑料降解造成機械強度變低而出現開裂;

4. To prevent cracking of the plastic due to the weld mark and the degradation of plastic, which leads to the lower mechanical strength;

5、適當使用脫模劑,注意經常消除模面附著的氣霧等物質;

5. Use release agent properly, pay attention to removing air mist and other substances attached to mold surface;

6、制件殘余應力,可通過在成型后立即進行退火熱處理來消除內應力而減少裂紋的生成;

6. Residual stress of the parts can be eliminated by annealing heat treatment immediately after forming, and crack generation can be reduced;

7、無潤滑或有潤滑但效果不佳;

7. No lubrication or lubrication, but the effect is not good;

8、適當調高模具溫度,使制件易于脫模,適當調低料溫防止分解;

8. The mold temperature should be adjusted properly to make the parts easy to demould and the material temperature should be lowered to prevent decomposition;

9、生產產品時,由于塑料在模腔中的不均勻冷卻和不均勻收縮以及產品結構設計的不合理,容易引起產品的各種缺陷;

9. When producing products, the plastic in the mold cavity is not uniform cooling and uneven shrinkage and unreasonable product structure design, which is easy to cause various defects of the product;

10、塑化不良,即熔體不能全部均勻地相熔;

10. The poor plasticization means that the melt can not be melted uniformly;

B、材料質量:

B. Material quality:

1、重生料含量太高,造成制件強度過低;

1. The heavy raw material content is too high, which causes the strength of the parts is too low;

2、濕度過大,造成一些塑料與水汽發生化學反應,降低強度而出現頂出開裂;

2. The humidity is too high, which causes some plastics to react with water vapor, and the cracking occurs when the strength is reduced;

3、原材料中雜質或重生料超標;

3. Impurities or raw materials in raw materials exceed the standard;

4、原材料含水量過大;

4. The water content of raw materials is too large;

5、材料本身不適宜正在加工的環境或質量欠佳,受到污染都會造成開裂。

5. The material itself is not suitable for the environment or quality under processing, and the cracks will be caused by pollution.

6、原料中易揮發物超出標準;

6. Volatile matter in raw materials exceeds the standard;

C、模具精密度:

C. Mold precision:

1、頂出要平衡,截面積要足夠,脫模斜度要足夠,型腔面要足夠光滑,才防止由于外力導致頂出殘余應力集中而開裂;

1. The ejection should be balanced, the sectional area should be enough, the release slope should be enough, and the cavity surface should be smooth enough to prevent cracking due to the concentration of residual stress caused by external force;

2、制件結構不能太薄,過渡部份應盡量采用圓弧過渡,避免尖角、倒角造成應力集中;

2. The structure of the parts shall not be too thin. The transition part shall be arc transition as far as possible to avoid stress concentration caused by sharp angle and chamfer;

3、盡量少用金屬嵌件,以防止嵌件與制件收縮率不同造成內應力加大;

3. The metal inserts should be used as little as possible to prevent the internal stress increase due to the different shrinkage rate between the inserts and the parts;

4、制模工藝不完善,主要表現在凸、凹模鍛坯內在質量差,熱處理技術及工藝有問題,造成凸、凹模淬不透,有軟點及硬度不均;

4. The process of die making is not perfect, which mainly shows that the internal quality of the forging blank is poor, the heat treatment technology and technology have problems, which causes the convex and concave die to be quenched impervious, and the soft point and hardness are uneven;

5、對深底制件應設置適當的脫模進氣孔道,防止形成真空負壓;

5. For deep bottom parts, proper air inlet channel for demoulding shall be set to prevent vacuum negative pressure;

6、主流道足夠大使澆口料未來得及固化時脫模,這樣易于脫模;

6. The main channel is enough to release the mold when the gate material is not ready to solidify, so it is easy to demould;

7、主流道襯套與噴嘴接合應當防止冷硬料的拖拉而使制件粘在定模上;

7. The main pipe bushing and nozzle shall be connected to prevent the dragging of cold and hard materials and make the parts stick to the fixed die;

8、沖模結構不合理。細長凸模沒有設計加固裝置,出料口不暢出現堆集,卸料力過大使凸模承受交變載荷加劇等;

8. The die structure is unreasonable. There is no reinforcement device for the slender punch, the discharge port is not smooth to accumulate, and the unloading force is too high to increase the alternating load of the punch;

9、模具溫度過低和熔體的流動性太差;

9. The temperature of the die is too low and the fluidity of the melt is too poor;

 

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