The invention discloses a rear-column lower decoration plate which comprises a plurality of deep hole structures, wherein plastic reduction and flow limitation structures are respectively arranged on the inner sides and/or the outer sides of the hole side walls on two sides of the deep hole structures opposite to the material flow direction. The invention also discloses a mold of the rear-column lower decoration plate; the mold comprises two plastic reduction and flow limitation structure forming blocks for forming the plastic reduction and flow limitation structures, wherein the plastic reduction and flow limitation structure forming blocks are arranged on a deep hole structure movable die or a deep hole structure fixed die or arranged on both the deep hole structure movable die and the deep hole structure fixed die. The invention discloses an injection molding method for the mold. The material flow direction is adjusted, so that the plastic reduction and flow limitation structure forming blocks on the two sides are respectively positioned on two sides of the material flow direction; the flow of materials C flowing to original air trapping points is limited, and the materials C can flow to the top ends of the deep hole structures without resistance, so that air is removed by an air exhaust mechanism at the bottom of a cavity of the deep hole structure movable die, and air trapping is avoided. Air marks on the surfaces of products near deep hole structures and other appearance defects are avoided, so that the products with good appearances are obtained, and batch production is successfully realized.


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    Title :

    Rear-column lower decoration plate and mold thereof as well as injection molding method


    Contributors:
    CAI SHUQIONG (author) / LIU SHANGJIN (author) / LI FEN (author) / LI XIN (author)

    Publication date :

    2015-04-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS / B29L INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES , Index-Schema für besondere Gegenstände in Verbindung mit Unterklasse B29C



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