Our company specializes in custom manufacturing of plastic toolbox molds in various styles. Below is a detailed description of our manufacturing process for toolbox molds.

Mold Material

The cavity and core of toolbox molds are generally made of P20 or 718H grade steel or above. These materials achieve a hardness of approximately 25 to 30 HRC. For customers requiring higher performance, we can procure better grades of mold steel according to specific requirements.

Mold Design Software

We use UG, CAD, PRO/E, and the Moldflow simulation software for mold design. Moldflow analysis is used to optimize runner layouts and gate positions to ensure balanced filling, which is particularly important for toolbox molds with complex geometries and multiple cavities.

Mold Processing Equipment

Our main processing equipment includes radial drilling machines, surface grinders, gantry CNC milling machines, engraving and milling machines, deep‑hole drilling machines, and EDM machines. For mold trials, we use Haitian injection molding machines ranging from 200T to 1,000T, depending on the part size and cavity count.

Side‑Action Core Mechanisms for Handles and Latches

Toolboxes typically feature handles and latching mechanisms that require side‑action cores (slides) to form undercuts and recessed features. An inclined guide pillar slide mechanism is commonly used, with the slide groove positioned on the moving mold plate. The slide travels perpendicular to the mold opening direction to form handle recesses or latch hooks. The slide angle is typically between 10° and 25°, with the travel distance determined by the depth of the undercut. The slides must be precisely guided and locked during injection to prevent flash. For complex latch designs, multiple slides or lifters may be required.

Latch Fit and Clearance Control

The latch engagement between the box body and the lid requires careful clearance control. Typical clearance values range from 0.1 to 0.2 mm to ensure consistent locking without being too tight or too loose. This precision is achieved through accurate machining of the slide cores and the corresponding cavity surfaces.

Cooling System

For toolbox molds, cooling efficiency directly affects production output and, consequently, the unit cost of the product. Cooling channels are arranged to provide balanced heat extraction across the varying wall thicknesses of the toolbox. In deep‑draw areas, baffles or bubblers are often used to enhance cooling of the core. The cooling circuit is designed to avoid interference with slide mechanisms and ejector pins.

Gate System

The gate system for toolbox molds is typically designed with the gate located at the bottom or on the internal surface of the box, where gate marks are less visible. Hot runner systems may be used depending on the customer's choice and production requirements. For multi‑cavity molds, runner balance is essential to ensure consistent filling across all cavities.

Venting System

Proper venting is critical in toolbox molds. Given the deep‑drawn geometry and multiple cavities, the venting system must be carefully designed to allow trapped air to escape during filling, preventing burning, short shots, and weld line defects. Venting depths are typically controlled within 0.02–0.05 mm to avoid flash while ensuring adequate air release.

Ejection System

The ejection system for toolbox molds uses a combination of ejector pins and a push plate. All ejector pins are made of SKD61 high‑quality steel. For parts with complex geometry, sequential ejection may be required, where slides retract prior and then the part is pushed off the core. The ejection force must be distributed evenly to avoid deformation of the box walls.

Surface Hardness Treatment

Surface hardness treatment is important for toolbox molds. The parting surfaces of the mold are typically treated with laser quenching to a depth of approximately 2 mm, achieving a surface hardness of approximately 50 HRC. This treatment extends the service life of the mold and reduces wear on sliding components.

Mold Life

The service life of a toolbox mold depends on the steel grade used. P20 steel, with a hardness of approximately 25 HRC, typically provides a mold life of around 200,000 cycles. 718H steel, with a hardness of approximately 30 HRC, provides a mold life of around 400,000 cycles. Higher‑grade steels can extend the mold life accordingly. For sliding components, nitriding or hardened steel inserts may be used to reduce wear and prolong service life.

Shipping and Packaging

Before shipment, the mold surface is treated with anti‑rust protection, and safety locks are installed to secure the mold. The mold is then wrapped in plastic film. For larger toolbox molds, cylinders and slide assemblies may be disassembled to reduce shipping volume and lower transportation costs for the customer.

The above is a brief overview of our plastic toolbox mold manufacturing process. For more information, please contact us.