射出成型之設(shè)計(jì)教程(編輯修改稿)
2025-02-03 06:44 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 elt Temperature ? Provide Adequate Venting ? Have Proper Nozzle Orifice ? Enlarge Runner And Gate ? Gate Into Heavy Sections Injection Molding Troubleshooting Voids Voids are Caused by shrinking of molten material when outside walls have solidified. Injection Molding Troubleshooting Voids Ways to Minimize Voids ? Check the Part Design ? Check Feed Rate ? Increase Injection Hold Time ? Increase Injection Speed ? Increase Mold Temperature ? Check Melt Temperature ? Increase Back Pressure ? Maintain Sufficient Venting ? Increase Runner/Gate Dimensions ? Increase Injection Pressure Injection Molding Troubleshooting Short Shots A Short Shot Is A Part That Is Not Completely Filled Injection Molding Troubleshooting Short Shots Ways to Minimize Short Shots ? Check for Nozzle Restriction ? Increase Injection Pressure ? Increase Stock Temperature ? Increase Venting ? Increase Mold Temperature ? Enlarge Gate and Runner Injection Molding Troubleshooting Flash Flash is the condition whereby molten material flows beyond the normal confines of the mold Injection Molding Troubleshooting Flash ? Not Enough Clamp ? Injection Pressure Too High ? Obstruction in The Mold ? Injection Speed Too Fast ? Melt Temperature Too High ? Improper Feed Rate ? Damaged Mold Injection Molding Troubleshooting Overpacking a Part Overpacking results from forcing too much material into the mold. The consequences of overpacking are heavier parts and moldedin stress. Injection Molding Troubleshooting Warpage A Warpage is caused by ? Uneven Wall Thickness ? Unequal Cooling Rate ? Unequal Pressure ? Anisotropy (Uneven Shrinkage Cause Warp) POLLING SLIDE Which of the following can affect warp in a part? A. Mold temperature of material. C. Gate location D. Uneven wall sections (thick, thin). E. All the above Correct answer is E Injection Molding Troubleshooting Warpage Ways to Minimize Warpage ? Change Mold Temperature ? Increase or Reduce Injection Pressure ? Increase Holding or Cooling Time ? Review Part Design ? Change Gate Location ? Increase Gate and Runner Dimension Injection Molding Troubleshooting Burn Mark Gas Burn is caused by the pression of trapped air and gasses at elevated temperatures and pressures Injection Molding Troubleshooting Gas Burn ? Improper clamp tonnage ? Lack of adequate venting ? Injection speed too fast ? Injection pressure too high ? Melt temperature too high Injection Molding Troubleshooting Poor Ejection Caused By: ? Roughness or undercuts ? Overpacking ? Inadequate knockout pins ? Poor cooling Injection Molding Troubleshooting Gate Blush Blush is the Result of Melt Fracture ? Material temperature too low ? Injection speed too slow or too fast
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