Plastic injection mold and molding method

Abstract

The invention discloses a plastic injection mold, which comprises a protective sleeve. A connecting handle is arranged on the inner wall of the protective sleeve, the surface of the connecting handleis connected with a limiting ring, the outer side of a polyurethane inner mold barrel is sleeved with the limiting ring, the polyurethane inner mold barrel is in butt joint in a butt joint groove, thebutt joint groove is formed in the surface of a plug plate, and an air bag is arranged in the butt joint groove. The invention further discloses a plastic injection mold and a molding method. The method comprises the following steps of bottom sealing of the protective sleeve, putting of the inner mold barrel, pouring sealing, static pressure molding and demolding. The plastic injection mold and the molding method have the beneficial effects that the opening of the protective sleeve is arranged to be larger than the diameter of the round face of the inner mold barrel, and cracking due to abrasion at the opening of the protective sleeve during the placing process of the inner mold barrel can be avoided; in addition, the limiting ring is matched with the connecting handle to isolate the inner mold barrel from the protective sleeve to form an annular cylinder space, the annular cylinder structure is filled with liquid conveyed by a liquid conveying hole, the outer side of the inner mold barrel is wrapped by the annular cylinder structure, and the inner mold barrel is evenly pressed.

Description

technical field [0001] The invention relates to the technical field of injection molds, in particular to a plastic injection mold and a molding method. Background technique [0002] After plastic products are poured and molded, the texture of the molded product is usually uneven due to uneven pressure during pouring, which affects the use, so there is an isostatic injection mold; isostatic pressure molding is to place the sample to be pressed in a high-pressure container , using the incompressible nature of the liquid medium and the property of uniform pressure transmission to uniformly pressurize the sample from all directions, when the liquid medium is injected into the pressure vessel through the pressure pump, according to the principle of fluid mechanics, its pressure is constant and uniformly transmitted to every direction. At this time, the pressure on the powder in the high-pressure container is uniform and consistent in all directions. The method of forming a dens...

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Problems solved by technology

[0003] In the prior art, the inner wall of the protective sleeve is attached to the inner mold barrel of the isostatic injection mold during placement, and it is easy to wear and crack when it contacts with the opening of the protective sleeve. After the cracking, water will easily enter the inner mold, and The inner mold is attached to the protective sleeve and injects water through the infusion hole. At this time, the inner mold cylinder is only pressed on the surface corresponding to the infusion hole, and the pressure is uneven; and the traditional isostatic pressing mold is connected to the protective sleeve by threads. During the rotation process, it will cause abrasion between the plug plate and the end surface of the inner mold barrel, resulting in uneven end surface of the inner mold barrel, which is prone to liquid leakage; and when demolding, the blocking structures at both ends of the protective sleeve need to be removed, and then the The product is launched, so every time the inner mold cylinder is loaded and unloaded, it is necessary to load and unload the end sealing structure many times

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