Method and die for eccentricity prevention of injection molding and rubber coating of slender rod

Abstract

The invention discloses a method and a die for eccentricity prevention of injection molding and rubber coating of a slender rod. A shunting shuttle which is of a bullet shape is arranged at the front end of a slender rod workpiece, the surface of the shunting shuttle is provided with a plurality of spiral shunting trenches, and the shunting shuttles are arranged at one ends of the die cavities of a moving die core and a fixed die core and communicated with the runner of the fixed die core; a guide ring capable of moving is sleeved on the body of the slender rod is sleeved by the guide ring capable of moving, and the guide ring isthe body of the slender rod and arranged in the die cavities of the moving die core and the fixed die core and can move in the die cavities; and then, the shunting shuttles, the guide ring and the slender rod workpiece are placed into the die cavity for injection molding production, then, the die is opened after injection molding is finished, and the shunting shuttles, the guide ring and the slender rod workpiece are taken out and separated. The top of the slender rod is additionally provided with the shunting shuttle, so that sol rubber uniformly enters the die cavity of the die after being shunted by the shunting shuttle. Thus, not only the top end of the slender rod is fixed effectively, but also rubber is uniformly introduced in the rubber introduction process. The problem that the slender rod is eccentric can be effectively solved in the slender rod rubber coating process, and the rejection rate of plastic injection parts can be greatly reduced.

Description

technical field [0001] The invention discloses an anti-eccentricity method and a mould, which can effectively prevent the eccentricity of a slender rod, and belongs to the technical field of injection moulds. Background technique [0002] Lagging of slender rods requires a long lagging distance and uniform wall thickness. In the actual production process, because of the poor bending strength of the slender rods, they are placed in the mold for lagging. The following situations will cause the product to be eccentric and scrapped : Glue is fed from the side of the slender rod, and the slender rod will be bent and deformed under the pressure of lateral glue feeding, resulting in eccentricity. The glue is fed from the top of the slender rod, and there is no support point in the middle of the slender rod. Under the action of its own gravity or a slight deformation of the slender rod, the deformation of the slender rod will gradually increase during the glue feeding process, and f...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preventing eccentricity of slender rods by injection molding and encapsulation, which solves the problem of eccentricity that is easy to occur when injecting and encapsulating slender rods

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