Movable Stripper Injection Molding Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current injection molding devices for producing complex hollow parts are overly complex and require multiple mold parts, leading to large geometric dimensions, which complicates the manufacturing process, especially when forming multilayer objects or undercuts.
Innovation Solution
A molding device with a movable stripper that can be positioned in three different locations along a core, allowing for the formation of complex hollow parts with minimal mold parts and reduced geometric dimensions, enabling efficient injection molding of hollow parts across multiple stations, including demolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple mold parts are used to form complex hollow parts, then design flexibility is improved, but device complexity increases
Solution Approach 1:
The stripper is designed to perform multiple functions: it forms part of the mold cavity during injection molding and acts as a demolding tool during ejection. This multi-functionality reduces the need for separate dedicated components, thereby reducing device complexity while maintaining design flexibility for complex hollow parts
Solution Approach 2:
The stripper is made movable along the core rather than being a fixed mold part. It can dynamically adjust its position between a first position (forming mold cavity) and a second position (demolding), enabling the system to adapt to different operational phases without requiring additional specialized components
2Adaptability or versatility
If multiple mold parts are used to form complex hollow parts, then design flexibility is improved, but geometric dimensions increase
Solution Approach 1:
The stripper serves dual purposes as both a mold cavity former and a demolding tool, eliminating the need for separate dedicated demolding mechanisms. This consolidation reduces the overall spatial requirements of the molding device while maintaining the capability to produce complex hollow parts with various designs
Solution Approach 2:
The functionality of the stripper is merged with the demolding mechanism, combining what would traditionally be separate components into one integrated element. This merging reduces the total volume and geometric dimensions of the molding device by eliminating redundant structures
3Device complexity
If a movable stripper is used, then device complexity is reduced, but the precision of stripper positioning must be maintained
Solution Approach 1:
The stripper is designed to move dynamically between defined positions along the core. The movement is constrained to specific trajectories and positions that are critical for forming the mold cavity and enabling demolding. This dynamic design reduces complexity by eliminating fixed, precision-machined positions while maintaining necessary precision through controlled motion
Solution Approach 2:
The stripper utilizes the injection pressure and demolding forces naturally present in the molding process to maintain its positioning and movement. The system leverages the process forces themselves to position the stripper accurately, reducing the need for additional active positioning mechanisms and their associated precision requirements
Data Source
AI summary
A molding device for manufacturing a plastic hollow part by injection molding includes an injection nozzle and first and second molding stations. Each molding station has a first mold including two mold halves forming, respectively, first and second mold cavities, and a core having a first end, which can be at least partially located inside the first and second mold cavities. A first stripper can be arranged on the core in a passive position, spaced from the first end of the core at a first distance; in a molding position, spaced from the first end of the core at a second distance; and in a demolding position, spaced from the first end of the core at a third distance; wherein the first distance is greater than the second distance, and the second distance is greater than the third distance.