What problems should be paid attention to when designing injection molds

What problems should be paid attention to when designing injection molds

Opening direction and parting line Each injection mold product must first determine its opening direction and parting line at the beginning of the design to ensure that the core slider mechanism is minimized and the parting line’s influence on the appearance is eliminated. After determining the mold opening direction, design the product’s stiffeners, buckles, protrusions and other structures to be as consistent as possible with the mold opening direction to avoid pulling the mold core to reduce the seam line and extend the molding time. The life of the mold.

After determining the opening direction of the injection mold, you can choose a suitable parting line to avoid reverse buckling in the opening direction, thereby improving the appearance and performance. Proper draft angle can avoid product pulling (stretching). The smooth surface of the draft should be greater than or equal to 0.5 degrees, the surface of fine particles (sand surface) should be greater than 1 degree, and the surface of rough particles should be greater than 1.5 degrees.

Proper draft angle can avoid damage to the top of the product, such as whitening, top deformation, bursting, etc. When designing products with deep cavity structure of injection molds, the outer surface slope should be as large as possible, greater than the inner surface slope, to ensure that the mold core is not deflected during injection molding, to obtain uniform product wall thickness, and to ensure the material strength and product opening time.

Product wall thickness Various injection molds have a certain wall thickness range, generally 0.54mm. When the wall thickness exceeds 4mm, it will cause excessive cooling time and shrinkage, so you should consider changing the product structure. Uneven wall thickness will cause surface shrinkage. Uneven wall thickness can cause air holes and weld lines. Reinforcing ribs The rational use of reinforcing ribs can increase the rigidity of the product and reduce deformation.

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