Cold runner silicon rubber forming die

Abstract

The invention relates to the field of forming dies, and particularly to a cold runner silicon rubber forming die. The cold runner silicon rubber forming die comprises a lower template, an upper template and pouring nozzle sleeves fixed on the templates, a main runner is arranged in the pouring nozzle sleeve, a sub-runner is arranged on the bottom of the main runner, and a cooling plate and a heat insulating plate are arranged around the lower temperate and the lower template. The cooling plate and the heat insulating plate are rationally arranged on positions around the upper template and the lower template to cause even temperature distribution in the runner and a forming die cavity under thermal conduction action of a heat conducting tube in the cooling plate and thermal insulation action of the heat insulating plate and ensure temperature of a rubber material in the main runner and the sub-runner in the die below curing temperature, thus directly injecting the rubber material into the die cavity next time to form a product. The die improves product quality, greatly saves the silicon rubber raw material, greatly reduces labor strength of workers and further improves production efficiency.

Description

technical field [0001] The invention relates to the field of forming molds, in particular to a cold runner silicone rubber forming mold. Background technique [0002] Silicone rubber products are widely used in the fields of electronics, automobiles, medical care and daily life due to their excellent physical and chemical properties such as excellent high and low temperature resistance, chemical resistance and excellent mechanical and electrical properties. [0003] Traditionally, the production method of silicone rubber products is die-casting, but the production efficiency of silicone rubber products produced by this production method is low, and it can no longer meet the rapid development of production needs, and has gradually developed towards injection molding. At present, there are two main injection molding production methods used by people to manufacture silicone rubber products. One is the hot runner injection molding method commonly used in ordinary plastic molding...

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Problems solved by technology

[0003] Traditionally, the production method of silicone rubber products is die-casting, but the production efficiency of silicone rubber products produced by this production method is low, and it can no longer meet the rapid development of production needs, and has gradually developed towards injection molding.

At present, there are two main injection molding production methods used by people to manufacture silicone rubber products. One is the hot runner injection molding method commonly used in ordinary plastic molding. Because silicone rubber is a thermosetting material, under certain pressure conditions, silicone rubber in the hot runner After injection in the system, it is heated to a certain temperature to become a cured high-elastic state. Even if it continues to heat, its state cannot be changed. The rubber in the runner system and the rubber in the cavity are vulcanized at the same time, and the vulcanized rubber is separated from the product and discarded. Material processing, waste vulcanized rubber usually needs to be removed manually. The above-mentioned production method not only seriously affects the production efficiency, but also wastes resources seriously; the other is to use cold runner injection molding, such as China Patent No. 20082001893. Although the cold runner injection molding method disclosed in "Mold" has been improved in the injection molding process, there is an uneven temperature distribution in the mold cavity, and the heat insulation and cooling inside the mold cannot achieve the predetermined effect, which seriously affects the quality of the finished product. Quality stability

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