Cooling Time of suntik dijieun Bagian

Itungan Cooling Time of Plastik Injection Molded Parts.

Salaku mesin suntik molding,di injection production, waktos cooling tina suntik plastik dijieun bagian akun pikeun ngeunaan 80% tina sakabéh siklus produksi suntik. Cooling goréng mindeng ngakibatkeun warpage produk atawa defects permukaan, nu mangaruhan stabilitas dimensi produk. Susunan anu wajar pikeun suntikan, 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 rongga kapang suntik 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.
Ayeuna, 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, atanapi waktos anu diperyogikeun pikeun ngahontal persentase kristalisasi anu ditangtukeun.

When solving the formula, asumsi handap umumna dijieun:

①The plastic is injected into the kapang suntik, 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. nyaeta, 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, suhu beungeut rongga kapang suntik sok seragam;

④ Darajat konduksi panas dina beungeut kapang suntik geus tangtu; (prosés ngeusian ngalembereh dianggap salaku prosés isothermal, sarta suhu bahan anu seragam)

⑤ Pangaruh orientasi sareng setrés termal tina plastik dina deformasi bagian tiasa dipaliré, jeung ukuran bagian nu teu boga pangaruh dina suhu solidification.

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