ABS內應力問題加工工藝(1)加工壓力過大、速度過快、充料太多、注射和

ABS內應力問題加工工藝(1)加工壓力過大、速度過快、充料太多、注射和保壓時間過長，都會造成內應力過大而開裂；(2)調節開模速度與壓力，防止快速強拉製件造成脫模開裂；(3)適當調高模具溫度，使製件易於脫模；適當調低料溫，防止分解；(4)預防由於熔接痕和塑料降解造成力學性能下降變低而出現開裂；(5)製件殘餘應力，可通過在成型後立即進行退火熱處理來消除內應力而減少裂紋的生成。模具方面(1)頂出要平衡，如頂杆數量、截面積要足夠，脫模斜度要足夠，型腔面要足夠光滑，這樣才防止由於外力導致頂出殘餘應力集中而開裂；(2)製件結構不能太薄，過渡部分應儘量採用圓弧過渡，避免尖角、倒角造成應力集中；(3)儘量少用金屬嵌件，以防止嵌件與製件收縮率不同造成內應力加大；(4)對深底製件應設置適當的脫模進氣孔道，防止形成真空負壓；(5)主流道足夠大，使澆口料未來得及固化時脫模，這樣易於脫模。

結果 (英文) 1:

ABS stress issues in
processing

(1) working pressure is too large, too fast, too much filling material, the injection and dwell time is too long, too much will cause stress cracking;

(2) adjusting the opening speed of the pressure die, to prevent rapid strong pull release parts causes cracking;

(3) due to increase the temperature of the mold, so that parts easy to release; due to lower melt temperature to prevent decomposition;

(4) Since the weld line preventing degradation of the plastic and cause performance degradation becomes low mechanical and cracking;

(5) parts residual stress, annealing may be performed immediately after the forming by the internal stress is reduced to eliminate crack formation.

Molds

(1) to balance out the top, such as the number of the jack, to a sufficient cross-sectional area, to release a sufficient slope, sufficiently smooth cavity surface, so as to prevent the external force ejection residual concentration of stress cracking;

(2 ) structural parts can not be too thin, the transition should arc transition, to avoid sharp corners, stress concentration caused by the chamfered;

(3) minimize the use of metal inserts to prevent internal stress different from the insert with the workpiece shrinkage rate increase;

(4) disposed on the deep-bottom article should release the appropriate channel inlet hole, preventing the formation of vacuum suction;

(5) sprue large enough so that when the gate cured release material is not enough time, so that easy release .

結果 (英文) 2:

Stress issues in ABS
Processing

(1) processing pressure is too large, too fast, too much filling, injection and pressure protection time is too long, will cause excessive internal stress and cracking;

(2) adjust the opening speed and pressure to prevent the rapid and strong pull parts caused by the release cracking;

(3) appropriately raise the mold temperature, so that the production is easy to release;

(4) Prevention of cracking due to the lower mechanical performance of meltmarks and plastic degradation;

(5) The residual stress of the assembly can eliminate the internal stress and reduce the generation of cracks by heating up immediately after forming.

Mold aspect

(1) The top out to balance, such as the number of top rods, cut area to be sufficient, the release slope to be sufficient, the cavity surface to be smooth enough, so as to prevent the external forces caused by the top residual stress concentration and cracking;

(2) The structure of the assembly should not be too thin, the transition part should try to use the arc transition, to avoid sharp corners, chamfers caused by stress concentration;

(3) Minimize the use of metal inserts to prevent the insert and the shrinkage rate of the component smaller caused by increased internal stress;

(4) The deep-bottomed parts should be equipped with a proper release intake hole to prevent the formation of vacuum negative pressure;

(5) The main road is large enough to release the pouring material in the future and when curing, so that it is easy to release.

結果 (英文) 3:

ABS internal stress
Processing technology
(1) Too high processing pressure, too fast speed, too much filling, too long injection and pressure holding time will lead to excessive internal stress and cracking;
(2) Adjust the opening speed and pressure to prevent the quick drawing of parts from cracking;
(3) Properly adjust the mold temperature to make the parts easy to demould; properly adjust the material temperature to prevent decomposition;
(4) To prevent cracking due to the degradation of mechanical properties caused by weld marks and plastic degradation;
(5) The residual stress of parts can be eliminated by annealing treatment immediately after forming to reduce the formation of cracks.
Mould aspect
(1) Ejection should be balanced, such as the number and cross-sectional area of ejector rods, the angle of demoulding should be enough, and the cavity surface should be smooth enough, so as to prevent cracking due to the concentration of ejection residual stress caused by external force;
(2) The structure of the part should not be too thin, and the transition part should adopt arc transition as far as possible to avoid stress concentration caused by sharp angle and chamfer;
(3) Use less metal inserts as far as possible to prevent the internal stress from increasing due to the different shrinkage rate of inserts and parts;
(4) For the deep bottom parts, the appropriate air intake channel for demoulding shall be set to prevent the formation of vacuum negative pressure;
(5) The sprue is large enough to demould the sprue before it solidifies, which is easy to demould.