A kind of injection mold and injection method of automobile tire pad

Abstract

The invention relates to an injection mold and an injection method for an automobile tire cushion belt. The injection mold comprises a front mold insert, a rear mold insert and a middle template, wherein the lower part of the front mold insert is provided with a first mold core which is composed of an inverted cone frustum and a cylinder; the cylinder is connected to the lower end of the inverted cone frustum; the upper part of the rear mold insert is provided with a second mold core which is composed of a cone frustum and a cylinder; the cylinder is connected to the upper end of the cone frustum; a through groove, of which the inner wall is in an arc form, is formed in the middle of the middle template, and is matched with the first mold core and the second mold core to form a mold cavity which is used for casting the tire cushion belt; the middle part of the front mold insert is provided with a positioning ring and a sprue bush; the sprue bush is arranged in the middle of the positioning ring and is communicated with a runner which is formed in a parting surface; the other end of the runner is communicated with the mold cavity; a material-pulling nail is arranged in the middle of the rear mold insert in a penetrating manner; longitudinal through holes are evenly distributed in the front mold insert, the rear mold insert and the middle template; heating rods are arranged in the longitudinal through holes; a middle template limiting mechanism is also arranged at one side end of the front mold insert. The injection mold is compact in structure; the injection method is convenient and fast; rapid formation of the tire cushion belt is facilitated.

Description

technical field [0001] The invention relates to an injection mold and an injection method of an automobile tire pad. Background technique [0002] The tire cushion belt, also known as the lining belt, refers to the annular tape used to protect the inner tire fitting surface from the wear of the rim. It is installed between the inner tube and the rim, the middle is thicker, and the two edges are gradually thinner from the inside to the outside. Existing tire pads are generally prepared by pressing with a plastic heat-sealing machine, but when the plastic heat-sealing machine is used for pressing, it is easy to cause ignition when the level of the mold is not adjusted enough, or the high-frequency current is adjusted too high during the heat-sealing process , It is easy to cause the mold to catch fire, which will cause great damage to the pressed mold, and frequent mold repairs are required, which virtually increases the production cost. At the same time, the temperature of ...

AI Technical Summary

Problems solved by technology

Existing tire pads are generally prepared by pressing with a plastic heat-sealing machine, but when the plastic heat-sealing machine is used for pressing, it is easy to cause ignition when the level of the mold is not adjusted enough, or the high-frequency current is adjusted too high during the heat-sealing process , it is easy to cause the mold to catch fire, which will cause great damage to the pressed mold, and frequent mold repairs are required, which virtually increases the production cost

At the same time, the temperature of the mold in the existing pressing process is usually 80°C, the plastic cannot be melted and bonded in the mold, and the bonding effect is not good. The prepared pad is prone to delamination during use, resulting in a short service life.

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