Moulding Detachment via External Pressurized Fluid
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Solution Overview
Problem
Conventional methods for detaching molded bodies from mold cores are inefficient when the mold cavity has an angled or curved longitudinal axis or larger cross-sections, making it difficult or impossible to insert a blow needle for compressed air detachment.
Innovation Solution
Applying a pressurized fluid, such as compressed air, to the outer surface of the molded body, which allows for detachment without the need for movable blowing needles, using a surface area that extends near the opening and is orthogonal to the cavity's inner surface, with a flow component parallel to the surface normal, and employing a two-stage blow-off process with varying pressure and duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a blow needle is inserted into the cavity for detachment, then compressed air can be applied to push off the molded body, but this becomes difficult or impossible when the cavity has an angled or curved longitudinal axis or larger cross-sections
Solution Approach 1:
Instead of inserting a blow needle into the cavity from the opening (conventional approach), the invention applies compressed air to the outer surface of the molded body from the outside. This inverted approach eliminates the need for needle insertion into difficult-to-access cavities while achieving the same detachment effect through pressure applied to the external surface.
Solution Approach 2:
The invention uses the outer surface of the molded body as an intermediary surface for pressure application. Rather than directly injecting air into the cavity through a blow needle, the compressed air acts on the external surface, which then transmits the detachment force to the molded body, bypassing the need for direct cavity access.
2Device complexity
If compressed air is applied to the outer surface, then no movable blowing needles are required, but a suitable contact surface must be provided
Solution Approach 1:
The molded body's own outer surface serves as the contact surface for compressed air application. The surface geometry created during molding automatically provides the necessary area for pressure application, eliminating the need for additional manufactured contact surfaces or modifications to the molded body.
3Ease of operation
If the cavity has larger cross-sections than the opening, then the molded body must deform elastically for detachment, but this requires considerable detachment forces
Solution Approach 1:
The invention replaces the mechanical blow needle insertion system with a pneumatic system that applies pressure to the outer surface. This substitution allows for more distributed and controlled force application, reducing peak detachment forces while achieving the same separation effect without requiring elastic deformation of the molded body.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable detachment of molded bodies with angled or curved cavities and larger cross-sections, reducing detachment forces and preventing damage, while eliminating the need for movable blowing needles and providing a suitable contact surface for pressure fluid application.
Implementation Method 1
a surface area of the shaped body, which has a surface normal having a directional component orthogonal to the boundary between the first and the second core section, is subjected to a pressure fluid and the shaped body is thereby removed from the mold core
Implementation Method 2
The pressure fluid is expediently supplied to the surface area in a flow direction having a flow component parallel to its surface normal
Data Source
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AI summary
Method for producing a moulding (1) having an outwardly open cavity, in particular a sucker, in which a mould mantle (30.1, 30.2) is placed against a mould core (20), which extends with a first core portion at a distance from the inner side of the placed mould mantle and with a second core portion (20.2), which adjoins the first core portion, right up against said mantel, the mould cavity between the mould core and the placed mould mantle is filled with a moulding compound, the mould mantle is removed after the moulding (1) formed from the moulding compound on the mould core has hardened and a surface region of the moulding that has a normal to the surface with a directional component orthogonal to the interface between the first core portion and the second core portion is subjected to a pressurized fluid and the moulding is thereby detached from the mould core, wherein the surface region subjected to the pressurized fluid is a region (4) of the outer surface of the moulding.