Stack Injection Molding Machine With Rotary Central Block
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Solution Overview
Problem
Existing injection molding machines with stack molds are expensive, have a high construction height, and are limited to producing interconnected parts within the molding cavities, making them unsuitable for producing multi-component parts efficiently.
Innovation Solution
The injection molding machine features a central block with molding areas for partial pre-molds on adjacent surfaces and external molding parts with grippers to position and connect pre-molds, allowing for the production of multi-component parts with reduced construction height and complexity, using a rotary or pivotal motion to form cavities for additional pre-molds and enabling connection of pre-molds without requiring extensive rotary drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two rotary drives with media guides and linear displacement devices are used for two central blocks, then multi-component injection-molded parts can be produced, but the construction cost increases and device complexity increases
Solution Approach 1:
The molding device is divided into a stack mold for producing first partial pre-molds and a separate rotary mold for producing second partial pre-molds. This segmentation allows each mold to be optimized independently and eliminates the need for complex dual rotary drive systems while maintaining multi-component production capability
Solution Approach 2:
A connection device serves as an intermediary between the stack mold and rotary mold, transferring first partial pre-molds to the rotary mold and enabling the production of multi-component parts without requiring direct integration of complex rotary drive mechanisms in both molds
2Productivity
If two central blocks are arranged side-by-side with rotary drives, then two-component pre-molds can be produced, but the construction height increases and turning circles must be considered
Solution Approach 1:
The design transitions from a horizontal arrangement of two central blocks requiring lateral turning space to a vertical stack configuration where the stack mold is positioned above the rotary mold, utilizing the vertical dimension to eliminate the need for large horizontal turning circles and reduce construction height
3Productivity
If stack molds are used to produce interconnected parts within molding cavities, then production efficiency increases, but the device is only suitable for specific part configurations
Solution Approach 1:
The rotary mold is designed with cavities that can accommodate various second partial pre-molds with different geometries and connection requirements. The connection device can adapt to different part configurations, making the system universal for producing multi-component parts in various arrangements while maintaining high production efficiency
Data Source
AI summary
An injection molding machine (1) having a stack mold (2) for producing injection molded parts comprises a fixed exterior molding part (3), a central block (5), as well as a mobile exterior molding part (4), with molding cavities being formed between the molding areas (9a, 9b) at the interior sides of the exterior molding parts (3, 4) and molding areas (10a, 10b) at opposite exterior sides of the central block (5). The central block (5) is supported rotationally or pivotally and at two exterior surfaces, adjacent to each other in the rotational or pivotal direction, molding areas (10a) are provided for first partial pre-molds (8a, 8c, 8e) and at the two other exterior surfaces, adjacent to each other, molding areas (10b) for second partial pre-molds (8b, 8d). The two exterior molding parts (3, 4) each include molding areas (9a, 9b) for one of the two partial pre-molds (8a, 8b, 8c, 8d, 8e) and, off-set in the rotary or pivotal direction in reference to the exterior molding parts (3, 4), at least one gripper (11a, 11b) each is provided for removing and holding a partial pre-mold (8a, 8c, 8e) and for positioning a previously removed first partial pre-mold (8a, 8c, 8e) to be interconnected to a second partial pre-mold (8b, 8d.) Alternatively the grippers for removing and holding a partial pre-mold (8f, 8g, 8h, 8i, 8l) and for inserting a previously removed first partial pre-mold (8f, 8g, 8h, 8i, 8l) is provided in a molding area (10b1, 10b2) for second partial pre-molds (8j, 8k) of the central block (5.)