사출 성형 부품의 냉각 시간

플라스틱 사출 성형 부품의 냉각 시간 계산.

사출성형기로는,~에 injection production, 플라스틱 사출 성형 부품의 냉각 시간은 약 80% 전체 사출 생산 주기의. 냉각이 제대로 이루어지지 않으면 제품이 휘어지거나 표면 결함이 발생하는 경우가 많습니다., 제품의 치수 안정성에 영향을 미치는. 합리적인 주입 배열, holding pressure and cooling time can improve product quality and productivity.

The cooling time of the part usually refers to the period from when the plastic melt is filled with the 사출 금형 캐비티 to when the part can be opened and taken out. The time standard for opening the mold to take out the parts is usually based on the fact that the parts have been fully cured, have a certain strength and rigidity, and will not be deformed or cracked when the mold is ejected.

Even if the same type of plastic is used for molding, its cooling time varies with the thickness of the wall, the temperature of the molten plastic, the demolding temperature of the molded part, and the temperature of the injection mold.

The formula to calculate the cooling time 100% correctly in all situations has not yet been published, but only formulas that can be calculated on the basis of appropriate assumptions. The calculation formula also differs depending on the definition of the cooling time.
현재, the following three standards are usually used as the reference basis for cooling time:

①The temperature of the center layer of the thickest part of the plastic injection molded part, and the time required to cool to below the thermal deformation temperature of the plastic;

②The average temperature in the section of the plastic injection molded parts, and the time required to cool down to the mold temperature of the specified product;

③The temperature of the center layer of the thickest part of the crystalline plastic molding wall is the time required to cool below its melting point, 또는 지정된 결정화 비율에 도달하는 데 필요한 시간.

When solving the formula, 일반적으로 다음과 같은 가정이 이루어진다:

①The plastic is injected into the 사출 금형, and the heat is transferred to the injection mold to be cooled;

②The plastic in the molding cavity is in close contact with the mold cavity and will not be separated due to cooling shrinkage. There is no resistance to the heat transfer and flow between the melt and the mold wall.

The temperature of the melt becomes the same when it contacts the mold wall. 그건, when the plastic is filled into the mold cavity, the surface temperature of the part is equal to the mold wall temperature;

③During the cooling process of plastic injection molded parts, the temperature of the surface of the injection mold cavity is always uniform;

④The degree of heat conduction on the surface of the injection mold is certain; (the melt filling process is regarded as an isothermal process, and the material temperature is uniform)

⑤The influence of the orientation and thermal stress of the plastic on the deformation of the part can be ignored, and the size of the part has no effect on the solidification temperature.

에 대한 질문이 있는 경우 사출 성형 ,plz 부담없이 물어보세요 플라이스 팀,우리는 당신에게 최고의 서비스를 줄 것입니다!