What type of mold frame is used for core pulling?

Mold Base Industry: The Importance of the Mold Frame for Core Pulling

In the mold base industry, the mold frame plays a crucial role in facilitating core pulling. Core pulling is a technique used in injection molding to remove undercuts or regions that would otherwise prevent the molded part from being ejected smoothly from the mold. This process requires a specialized mold frame that enables the movement of cores within the mold. In this article, we will explore the different types of mold frames commonly used for core pulling and their significance in the manufacturing process.

1. Standard Mold Frame

The standard mold frame is the most basic and commonly used type in the industry. It typically consists of a stationary and a movable mold plate, which provide the necessary support for the mold components. Core pulling is achieved by designing the mold with slots or openings within the frame to accommodate the movement of cores. This type of mold frame is cost-effective and easy to manufacture, making it suitable for simple core pulling operations.

2. Full Guided Mold Frame

A full guided mold frame offers enhanced support and stability for core pulling operations. It includes additional components such as guide pins, guide bushings, and alignment plates. These components ensure that the cores move accurately and consistently within the mold, minimizing the risk of misalignment or deflection. This type of mold frame is commonly used for complex mold designs and parts with intricate undercut features.

3. Stripper Plate Mold Frame

A stripper plate mold frame is specifically designed for molds with deep undercuts or complex part geometries. It incorporates a stripper plate, which is a separate plate that moves in synchronization with the core pulling mechanism. The stripper plate pushes against the molded part, allowing it to be released from the undercut region. This type of mold frame enables efficient ejection of parts with multiple undercuts, reducing the risk of damage or deformation.

4. Unscrewing Mold Frame

An unscrewing mold frame is used for producing threaded or screw-like parts. It incorporates a rotating mechanism within the mold, which enables the core to rotate while it is being pulled. This rotation aligns the screw threads, allowing for easy removal of the part from the mold. This type of mold frame is commonly used in industries such as automotive, electronics, and consumer goods where threaded parts are prevalent.

Conclusion

In conclusion, the mold frame plays a critical role in facilitating core pulling in the mold base industry. Each type of mold frame offers specific advantages depending on the complexity of the mold design, the type of molded part, and the desired undercut features. From the standard mold frame to the unscrewing mold frame, manufacturers have a range of options to choose from to achieve efficient and effective core pulling operations. By selecting the appropriate mold frame, manufacturers can ensure smooth ejection of molded parts, improve production efficiency, and maintain high product quality.