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Pressure and injection molding cycle
by：CSSSLD
2021-02-03
The structure of injection mold are many, but each pair of injection mold is fixed by dynamic model and mode of two most, dynamic model is installed on the dynamic template of the injection molding machine, mold is installed on the injection molding machine set template.
Injection molding process dynamic model with the die closed cavity and gating system, mould when moving die and die separation in order to take out the plastic parts.
Molding parts refers to the mold cavity, and direct contact with plastic melt mould parts.
Generally have die, core, molding, inserts, etc. , in the dynamic, the closed die, then determine the plastic molding parts inside and outside size.
the mold temperature on the melt filling capacity and plastic pieces of internal performance and appearance quality influence. Mold temperature depends on the whether, plastic crystalline structure size and performance requirements, and other process conditions, melt temperature, injection speed, injection pressure, molding cycle, etc. Mold temperature set by the mold temperature control system to control. The pressure in the injection molding process includes both plasticizing pressure and injection pressure.
injection mold is mainly used for forming thermoplastic plastics, but also widely used in the thermosetting plastic forming parts. Due to injection mold production and strong adaptability, high efficiency and easy to realize automation, etc, thus has been widely used in the production of plastic parts in the application, it accounts for about 50% of all plastic molding mold. The structure of injection mold is selected according to the type of injection molding machine, plastic pieces of the structure characteristics and a number of injection molding plastic parts.
plasticizing pressure, also known as back pressure, refers to the injection molding machine screw at the top of the melt during the screw rotation back pressure. Increasing back pressure can increase the melt temperature and the temperature evenly, but will reduce the speed of the plasticizing. Back pressure relief valve in the hydraulic system to adjust. Injection molding, the plasticizing pressure varies with the size of the screw design, plastic parts quality requirements and the type of plastic. Injection pressure to overcome the melt flowing from cylinder cavity flow resistance, provide mold filling speed as well as the compaction of the melt and so on.
the size of the injection pressure and plastic parts have a direct relationship between the quality and productivity. Are many factors that affect the injection pressure, with a plastic varieties, types of injection molding machine, stamping and mold structure as well as other process conditions, etc. , and the relationship between various factors is very complex. On the premise of guarantee the quality of plastic parts, the paragraphs should try to shorten the molding cycle time, in order to improve production efficiency. One of the most important is time and cooling time of injection, they for the product quality and production efficiency has a decisive influence. In production, mold filling time is usually 3 - 5 s, the holding time for 20 - commonly 120 s, cooling time is 30 - commonly 120年代。
by the impact of the nozzle temperature from plastic injection molding processing of what happens when the friction heat to get a certain amount of compensation, but should pay attention to, low temperature too much may lead to melt early chocked up with coagulation and nozzle. The choice of the cylinder and the nozzle temperature are not isolated, have a certain relationship with other process conditions. Such as the size of the injection pressure has a direct influence on the temperature, while maintaining the same flow rate, lower injection pressure, generally corresponds to a higher temperature, on the contrary, the higher injection pressure, corresponding to the lower temperature.
injection speed said there are two kinds of methods, one kind is to use injection molding of plastic melt volume flow, another kind is to use injection screw or plunger axial displacement speed, its value can be adjusted by injection molding machine control system. Injection rate and injection pressure supplement each other, the quality of melt flow, molding and its products also have a direct impact, therefore, for different plastics products and technological requirements are adopted by different injection velocity.
more excellent articles: structure and function of injection molding machine, click directly.
http://www。 csssld。 cn//html/2017/Info_0628/617。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the mold temperature on the melt filling capacity and plastic pieces of internal performance and appearance quality influence. Mold temperature depends on the whether, plastic crystalline structure size and performance requirements, and other process conditions, melt temperature, injection speed, injection pressure, molding cycle, etc. Mold temperature set by the mold temperature control system to control. The pressure in the injection molding process includes both plasticizing pressure and injection pressure.
injection mold is mainly used for forming thermoplastic plastics, but also widely used in the thermosetting plastic forming parts. Due to injection mold production and strong adaptability, high efficiency and easy to realize automation, etc, thus has been widely used in the production of plastic parts in the application, it accounts for about 50% of all plastic molding mold. The structure of injection mold is selected according to the type of injection molding machine, plastic pieces of the structure characteristics and a number of injection molding plastic parts.
plasticizing pressure, also known as back pressure, refers to the injection molding machine screw at the top of the melt during the screw rotation back pressure. Increasing back pressure can increase the melt temperature and the temperature evenly, but will reduce the speed of the plasticizing. Back pressure relief valve in the hydraulic system to adjust. Injection molding, the plasticizing pressure varies with the size of the screw design, plastic parts quality requirements and the type of plastic. Injection pressure to overcome the melt flowing from cylinder cavity flow resistance, provide mold filling speed as well as the compaction of the melt and so on.
the size of the injection pressure and plastic parts have a direct relationship between the quality and productivity. Are many factors that affect the injection pressure, with a plastic varieties, types of injection molding machine, stamping and mold structure as well as other process conditions, etc. , and the relationship between various factors is very complex. On the premise of guarantee the quality of plastic parts, the paragraphs should try to shorten the molding cycle time, in order to improve production efficiency. One of the most important is time and cooling time of injection, they for the product quality and production efficiency has a decisive influence. In production, mold filling time is usually 3 - 5 s, the holding time for 20 - commonly 120 s, cooling time is 30 - commonly 120年代。
by the impact of the nozzle temperature from plastic injection molding processing of what happens when the friction heat to get a certain amount of compensation, but should pay attention to, low temperature too much may lead to melt early chocked up with coagulation and nozzle. The choice of the cylinder and the nozzle temperature are not isolated, have a certain relationship with other process conditions. Such as the size of the injection pressure has a direct influence on the temperature, while maintaining the same flow rate, lower injection pressure, generally corresponds to a higher temperature, on the contrary, the higher injection pressure, corresponding to the lower temperature.
injection speed said there are two kinds of methods, one kind is to use injection molding of plastic melt volume flow, another kind is to use injection screw or plunger axial displacement speed, its value can be adjusted by injection molding machine control system. Injection rate and injection pressure supplement each other, the quality of melt flow, molding and its products also have a direct impact, therefore, for different plastics products and technological requirements are adopted by different injection velocity.
more excellent articles: structure and function of injection molding machine, click directly.
http://www。 csssld。 cn//html/2017/Info_0628/617。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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