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https://www.jewardmould.com/large-part-injection-molding/

Long with the grow of the market and the popularization of large injection machine, the demand of large part molding also grows up every year. The large part molding has the advantages as high productivity, good consistency of product, low cost in mass production.

However, it needs long development cycle and requires heavy investment on injection molding machine and mould. Specially, the large size mould is not the simply enlarge of middle and small mould. It has many differences in the mould design, manufacture and assembly. We need to pay special attention to the following points:

The rigidity of mould

During the large part injection molding design, except for the strength, we also need to carefully calculate the mould’s rigidity. Considering the high injection pressure, large cavity size and high deformation, it’s necessary to strengthen the locating mechanism，cavity side plate and core bottom plate.

Injection system

Since the L／￡ of plastic melt in large part mould is relatively high, and most of them use multiple gating hot runner, the design of mould injection system is critical. It could directly influence the melt pressure, melt temperature, filling process, holding process and many other elements. Also, it affects the product’s quality and the mould’s strength, rigidity and life span. Therefore, the injection system is the key object of the mould optimization. During the design process, we carefully analyze the system through mold flow analysis and other technologies.

Processing technology

For the large part mould design, we need to take the convenience of processing and maintenance into consideration. Since the large part mould has more troubles of processing, movement and installation, we could separate a certain of structure into several small parts or inserts. It helps to reduce the dependency of large processing equipment and lower the cost. Also, we could process multiple parts at the same time to improve the productivity.

CASE STUDY
CHICKEN CRATE MOULD
Specialty: One mould, produce two products in different height by change the cavity sliders and insert block.

Version I：Product Dimension:1160x760x250mm; Product Weight:8700 g

Version II: Product Dimension:1160x760x215mm; Product Weight:8160 g

Mould size: 1900x1500x820 mm

Mould weight: 18 Ton

Casting system: 8 point hot runner system.

Injection machine：2400T

240L WASTE BIN MOULD
Specialty: Inset Be-Cu on the bottom and edge of product, to enforce the cooling effect and shorten the cycle time. The design of product is under EN840 standard.

Product Dimension： 585X720X1020 mm

Product Weight： 8350 g

Mould Size: 1200x1050x1440 mm

Mould Weight: 13.5 Ton

Casting System: 1 point hot runner

Injection Machine：2400T

If you need any kinds of injection moulding die, please contact us, as a professional injection mold maker, jeward is willing to offer you high quality products.