Analysis of common problems in molding processing
1. Vacuum hole.
The main reason may be insufficient pressure, including cold pressing, hot pressing, cooling period, etc., it is necessary to set the molding pressure reasonably; It may also be that the exhaust is not complete, there is an aeration situation, in the cold pressing, material melting stage, to try to discharge the air between the powder and the melt.
2, surface or internal impurities pollution.
Clean molds and check for powder contamination, oven cleanliness and other possible contamination sources.
3, the color of the parts is too dark, and even some materials are degraded.
The main reason may be that the heating temperature is too high, the high temperature process period is too long, it is necessary to check whether the set temperature and the actual temperature are in a reasonable range, and whether the period of each section of the molding is reasonable.
4. There is unmelted powder.
The main reason may be that the heating temperature is too low, or the process cycle of the high temperature section is too short, resulting in the material failing to achieve the effect of heating and melting, it is necessary to check whether the setting temperature and the actual temperature are in a reasonable range, and whether the cycle of each section of the molding is reasonable.
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