Injection molding method, module and molded parts

Abstract

The invention relates to an injection molding method, a module and molded parts. A plurality of molds which jointly form one module form at least one mold cavity for injecting a molten molding material; at least one of the molds comprises a base part and at least one pressurizing part; after the molding material is injected, the pressurizing part is additionally moved to extrude the molding material corresponding to the pressurizing part in the mold cavity to a predetermined density higher than that of the molding material corresponding to the base part; thus in the cooling process of the molding material, the molding material corresponding to the pressurizing part has high density and can not be bent easily; and in the cooling and shaping process of the molding material, the molding material corresponding to the pressurizing part can not be distorted easily. Thus, when at least one molded part is taken out respectively from a high density area, a low density area and a graded density area by demoulding, the molded part in the high density area can keep an ideal shape.

Description

technical field [0001] The invention relates to an injection molding method, a module and a molding. Background technique [0002] Such as figure 1 As shown, a common mold set 1 used in an injection molding machine includes, for example, a movable male mold 11 and a female mold 12 installed on the machine base. The male mold 11 moves relatively to the Closely fit with the master mold 12, and together form a mold cavity for pouring molten mold material; then inject the mold material through the injection hole (not shown) on the mold to fill the mold cavity, and wait for the mold material to cool down and solidify, that is The male mold 11 can be separated from the female mold 12, and the molding can be taken out from the mold cavity. [0003] Although this injection molding technology is very mature, there is generally no room for major breakthroughs. However, the molding 5 made by the above-mentioned molding module, such as figure 2 For example, a piece of plastic produc...

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Problems solved by technology

[0003] Although this injection molding technology is very mature, there is generally no room for major breakthroughs. However, the molding 5 made by the above-mentioned molding module, such as figure 2 For example, a piece of plastic product with different thickness regions, the following problems will occur: in the manufacturing process, after the molten mold material fills the mold cavity, it is gradually cooled with the mold group until it is formed, and is formed by the mold The thinner part of the cavity begins to solidify, while the thicker part of the cavity solidifies later, and because the part is still gradually cooling and shrinking, a lateral contraction force is generated on the thinner part that has been shaped, resulting in a relatively thin plastic surface. Unexpected slight warping of thin parts, causing water ripples on the surface51

However, this method not only makes the junction easily damaged and broken because the materials are not easy to tolerate each other, but the junction may also form irregular or even gaps at the border, which will affect the appearance and structural reliability of the product, and even hide dirt in the gaps. It defaces the appearance of the product; and because of the porous injection, the manufacturing process becomes complicated and expensive, which reduces the competitiveness of the product, so it is not a good solution

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