Rotatable Central Mold Half for Multi-Material Injection Molding
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Solution Overview
Problem
Existing injection molding devices lack the capability for precise positioning and efficient production of complex parts with multiple material components, particularly in producing hinged closures that can be closed before removal, while also producing other parts in separate mold planes.
Innovation Solution
An injection molding device with a central mold half that can be rotated and linearly moved, interacting with multiple mold halves in different parting planes, and a capping device with a second base plate and locking brackets that can close hinged closures efficiently by positioning locking brackets behind caps, allowing for precise alignment and processing of parts during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotatable central mold part is used to produce multiple material components, then the versatility of the injection molding device is improved, but the device complexity increases
Solution Approach 1:
The injection molding device is divided into separate functional modules: a first mold half, a second mold half, and a rotatable central mold part. Each module can be independently controlled and positioned, allowing the production of complex multi-material parts while maintaining manageable system complexity through modular design
Solution Approach 2:
The central mold part is designed to be rotatable about a vertical axis, enabling dynamic repositioning between different production levels. This dynamic capability allows the same mold part to interact with multiple stationary mold halves, increasing versatility without requiring multiple complete mold sets
2Stability of the object's composition
If the central mold part is supported on machine bed bars, then the stability of the mold part is improved, but the manufacturing precision deteriorates
Solution Approach 1:
A carriage is introduced as an intermediary component between the machine bed bars and the rotatable central mold part. The carriage provides precise positioning and support for the mold part, while the guide rods embedded in the machine bed ensure stable linear movement. This intermediary structure resolves the conflict between stability and precision by distributing functions across multiple components
Solution Approach 2:
The support system uses guide rods that extend vertically from the machine bed, providing stability in the vertical dimension while allowing precise horizontal positioning through carriage movement along the rods. This dimensional separation enables independent optimization of stability and positioning precision
3Productivity
If hinged closures are produced with rotation of the mold, then the productivity is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The system incorporates synchronization between the rotation of the central mold part and the linear movement of the mold halves along the spars. This coordinated feedback control ensures that hinged closures are properly aligned and formed during the rotational process, maintaining manufacturing precision while enabling continuous production
Solution Approach 2:
The mold design includes pre-positioned guide elements and alignment features that prepare the hinged closure components for proper alignment before the actual molding action occurs. This preliminary positioning ensures high precision even during rapid rotational production cycles
Data Source
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AI summary
The invention relates to an injection moulding device (1) with a first mould half (2) and a second mould half (3), arranged movably with respect to said first half, and a central mould half (4) arranged between said first and second halves and rotatable about an axis of rotation (19). Arranged to the side of the central mould half (4) is a further processing device (21).