Anti-eccentric injection molding method and device

Abstract

The invention discloses an anti-eccentric injection molding method and device. The anti-eccentric injection molding device comprises a sprue bush (2) arranged on a mold base (1) and a mandrel (3) arranged in the sprue bush. One end of the sprue bush communicates with an injection molding sprue. The anti-eccentric injection molding device is characterized in that the mandrel is sleeved with a sliding part (5), and the outer sidewall of the sliding part is matched with the inner sidewall of the sprue bush. In the glue injection process, glue liquid goes into the sprue bush from a sprue to push the sliding part to move forwards, and the sliding part plays a role in limiting the mandrel, so that finished products subjected to glue injection are protected against eccentricity. According to the anti-eccentric injection molding method and device, the sliding part arranged on the mandrel has an axial limiting effect on the mandrel, eccentricity of products subjected to glue injection can be remarkably prevented, and accordingly the defective rate of the products is reduced.

Description

technical field [0001] The invention relates to an anti-eccentricity injection molding method and device, in particular to an injection molding method and device for injection molding slender shaft products (including mandrels). Background technique [0002] Printers and other equipment are widely used in slender shaft products (also called rubber rollers or rollers), and rollers are usually made of plastic or rubber; the substantial benefits of plastic rollers: first, save materials and reduce costs; second, improve production efficiency , Low-carbon environmental protection. [0003] The injection molding machine is an existing mature equipment. During the injection molding process of slender shaft products (also called rubber rollers or rollers), there are the following defects: because the slender shaft usually exceeds 30 cm, there is a stainless steel mandrel inside, and the mandrel is outsourced. For plastic, it is extremely difficult to stably and continuously mass-p...

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Problems solved by technology

[0003] The injection molding machine is an existing mature equipment. During the injection molding process of slender shaft products (also called rubber rollers or rollers), there are the following defects: because the slender shaft usually exceeds 30 cm, there is a stainless steel mandrel inside, and the mandrel is outsourced. For plastic, it is extremely difficult to stably and continuously mass-produce and shape such slender parts; because the mandrel is very slender and the middle is full of plastic, during the injection process, the extrusion of the glue in all directions is often uneven, making the final The product is prone to eccentricity, which will cause fatal defects such as poor beating of slender shaft products during use

[0004] This bad product hinders the widespread use of this type of product and the in-depth promotion of plastic rollers, so as to further reduce the use of rubber rollers and reduce the negative impact on the environment, etc.

[0005] Therefore, there is a big bottleneck in the injection molding technology of plastic rollers

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