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Injection molding parts cooling time setting the three standard as reference?
by：CSSSLD
2021-01-23
Injection molding parts cooling time setting the three standard as reference?
in the injection production, plastic injection molding processing cooling time accounts for about 80% of the whole production cycle injection. Cooling bad often lead to products or warping deformation surface defects, the size of the affected products stability. Reasonably arrange injection, pressure maintaining and cooling time, improves the product quality and productivity. Parts of cooling time, usually is refers to the plastic melt from full of injection mold cavity mould opening can take out the parts with respect to this period of time. Can open mold to take out the time standard parts, often in parts has been fully cured, with a certain intensity and rigidity, when open mold ejection from deformation and cracking. Even if it is to use the same kind of plastic molding, cooling time and the wall thickness, the temperature of the molten plastic, von berg systeme ejection temperature and mold temperature. One hundred percent in all the cases can correctly calculate the cooling time formula has not been published, but only on the basis of appropriate assumptions to calculate formula. Calculation formula in different cooling time definition varies. At present, the plastic mold factory in changshu normally with three standard as reference in the cooling time of the following: (1)
the thickest part center layer of plastic injection molding processing parts wall temperature, cooling below the heat distortion temperature of the plastic time; (2)
the average temperature of the plastic injection molding processing section and cooling to the products of the mold temperature to the stipulated time; 3.
crystalline plastic wall the thickest part of the center layer temperature, cooling below its melting point time, or at the time needed for crystallization percentage. When solving formula, generally for the following assumptions: (1)
plastic injection in injection mold, and the heat transfer to the injection mould and cooling; (2)
into the plastic contact closely with cavity inside the cavity, not separation, by cooling contraction between melt and mold wall heat transfer and flow without any resistance, molten material in contact with the mold wall at the same moment its temperature has become. When plastic filling the cavity, the surface temperature is equal to the mold wall temperature; 3.
cooling process of plastic injection molding processing parts, injection mould cavity surface temperature keeps uniform; (4) a certain degree of heat conduction on the surface of the injection mould ( Molten material as isothermal process, molding process and material WenJunYi) ; 5.
plastic orientation and the thermal stress on the deformation can be ignored, the influence of the product parts size effect on solidification temperature does not occur.
injection mold frame production more scattered than cold die frame
at present, the mold has been more and more feel the pressure from the effects of their Chinese counterparts and, by 2018, China will become one of the world's largest mold manufacturing base. Germany's RWTH aachen university professor Alexander has in ninghai inspection issued such a sigh when its mold manufacturing base. According to the related research department, the mold design and production time to is faster than China's 44% and 61% respectively, but China mold and die design and manufacturing cost is only 91% of European peers, because China's low labor costs, has strong appeal for some foreign clients. In 58% of the world's mold is produced by western European countries such as Germany, China and other Asian countries account for only 1%, but the future of eastern Europe mold there will be a substantial production scale and Asian countries will increase to about 22%. Given China's cheap labor cost advantage and good momentum of rapid and continuous development of the economy as a whole, will have a wide prospect in the development of China mold and die. 'But this does not mean that all of China's development is the ideal and perfect. 'Alexander thinks, because of China's market prematurely into a myth of price war, also lacks the ability of independent innovation, not correspondingly establish integrity and reliable market system, especially the 65% of European customers like China mould price is low but the quality is not good. A kind of ideal solution is to strengthen the cooperation of both parties, out of order and drawings from European countries, China mold enterprise to be responsible for complete design and processing production, and keep learning in the process of European advanced technology and management concept, to speed up the industrialization of the transformation, efforts to improve their own core advantage and competitiveness. Such as in the aspect of improving customer satisfaction, the enterprise in addition to outside the make an issue of low price, more important is the demand of delivery time is short, products of good quality and high integrity, as far as possible to let them know the whole process of product research and development, design and production enterprises to clear their own specialty, strengthen the cooperation between each other, react to the needs of customers in a timely and effective manner.
in the injection production, plastic injection molding processing cooling time accounts for about 80% of the whole production cycle injection. Cooling bad often lead to products or warping deformation surface defects, the size of the affected products stability. Reasonably arrange injection, pressure maintaining and cooling time, improves the product quality and productivity. Parts of cooling time, usually is refers to the plastic melt from full of injection mold cavity mould opening can take out the parts with respect to this period of time. Can open mold to take out the time standard parts, often in parts has been fully cured, with a certain intensity and rigidity, when open mold ejection from deformation and cracking. Even if it is to use the same kind of plastic molding, cooling time and the wall thickness, the temperature of the molten plastic, von berg systeme ejection temperature and mold temperature. One hundred percent in all the cases can correctly calculate the cooling time formula has not been published, but only on the basis of appropriate assumptions to calculate formula. Calculation formula in different cooling time definition varies. At present, the plastic mold factory in changshu normally with three standard as reference in the cooling time of the following: (1)
the thickest part center layer of plastic injection molding processing parts wall temperature, cooling below the heat distortion temperature of the plastic time; (2)
the average temperature of the plastic injection molding processing section and cooling to the products of the mold temperature to the stipulated time; 3.
crystalline plastic wall the thickest part of the center layer temperature, cooling below its melting point time, or at the time needed for crystallization percentage. When solving formula, generally for the following assumptions: (1)
plastic injection in injection mold, and the heat transfer to the injection mould and cooling; (2)
into the plastic contact closely with cavity inside the cavity, not separation, by cooling contraction between melt and mold wall heat transfer and flow without any resistance, molten material in contact with the mold wall at the same moment its temperature has become. When plastic filling the cavity, the surface temperature is equal to the mold wall temperature; 3.
cooling process of plastic injection molding processing parts, injection mould cavity surface temperature keeps uniform; (4) a certain degree of heat conduction on the surface of the injection mould ( Molten material as isothermal process, molding process and material WenJunYi) ; 5.
plastic orientation and the thermal stress on the deformation can be ignored, the influence of the product parts size effect on solidification temperature does not occur.
injection mold frame production more scattered than cold die frame
at present, the mold has been more and more feel the pressure from the effects of their Chinese counterparts and, by 2018, China will become one of the world's largest mold manufacturing base. Germany's RWTH aachen university professor Alexander has in ninghai inspection issued such a sigh when its mold manufacturing base. According to the related research department, the mold design and production time to is faster than China's 44% and 61% respectively, but China mold and die design and manufacturing cost is only 91% of European peers, because China's low labor costs, has strong appeal for some foreign clients. In 58% of the world's mold is produced by western European countries such as Germany, China and other Asian countries account for only 1%, but the future of eastern Europe mold there will be a substantial production scale and Asian countries will increase to about 22%. Given China's cheap labor cost advantage and good momentum of rapid and continuous development of the economy as a whole, will have a wide prospect in the development of China mold and die. 'But this does not mean that all of China's development is the ideal and perfect. 'Alexander thinks, because of China's market prematurely into a myth of price war, also lacks the ability of independent innovation, not correspondingly establish integrity and reliable market system, especially the 65% of European customers like China mould price is low but the quality is not good. A kind of ideal solution is to strengthen the cooperation of both parties, out of order and drawings from European countries, China mold enterprise to be responsible for complete design and processing production, and keep learning in the process of European advanced technology and management concept, to speed up the industrialization of the transformation, efforts to improve their own core advantage and competitiveness. Such as in the aspect of improving customer satisfaction, the enterprise in addition to outside the make an issue of low price, more important is the demand of delivery time is short, products of good quality and high integrity, as far as possible to let them know the whole process of product research and development, design and production enterprises to clear their own specialty, strengthen the cooperation between each other, react to the needs of customers in a timely and effective manner.
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