Temperature-Controlled Screw with Embedded Hollow Profile
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Solution Overview
Problem
Existing internally temperature-controlled screws require high processing efforts and costs for manufacturing due to complex flow channel formations within the screw body.
Innovation Solution
The design incorporates a helically shaped through-flow channel formed by an independent hollow profile body embedded within the screw flight, eliminating the need for additional channel formation and allowing for a one-piece metal cast construction, which simplifies production and enhances strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow channels are formed within the screw body through complex processing methods, then the screw achieves internal temperature control capability, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The hollow profile body forming the flow channel is embedded within the screw flight during the casting process. The profile body is nested inside the screw structure, with its outer contour followed by the helical flow channel, eliminating the need for separate channel formation operations.
Solution Approach 2:
The hollow profile body is prepared in advance with the desired flow channel geometry before being embedded in the screw flight. The profile body includes pre-formed features such as the helical contour and connection to supply/discharge channels, so that when cast into the screw, the flow channels are already formed without requiring additional processing steps.
2Device complexity
If flow channels are formed by embedding hollow profile bodies, then manufacturing complexity is reduced, but the strength of the screw flight may be compromised
Solution Approach 1:
The hollow profile body is embedded within the screw flight material such that the profile body and screw flight form an integrated structure. The metal cast material surrounding the profile body creates a unified component where the flow channel is an inherent part of the screw structure, maintaining structural integrity.
Solution Approach 2:
The screw flight structure is designed with different properties in different regions: the hollow profile body region provides flow channels for temperature control, while the surrounding metal cast material provides structural strength. The helical contour of the profile body follows the outer contour of the screw flight, ensuring that strength is maintained in critical load-bearing areas.
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
This approach reduces manufacturing complexity and cost while ensuring tightness and flawless flow, increasing the screw's strength and allowing for precise embedding of the hollow profile body during casting, resulting in a compact, cost-effective, and efficiently producible screw.
Implementation Method 1
The hollow profile body forms the likewise helically running through-flow channel within the screw web for conducting a temperature-control medium through
Implementation Method 2
The material of the screw flight and the base body is formed by a metal cast material and the base body and the at least one screw flight are formed in one piece from the metal cast material
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to an internally temperature-controllable screw (1) with a basic body (2), which is arranged rotatably about a longitudinal axis (3) and on which at least one helically formed screw flight (4) is arranged. Arranged within the screw flight (4) is at least one flow channel (5) for passing through a temperature control medium, which is likewise formed helically and following an outer contour of the screw flight (4). The flow channel (5) is formed by an independent hollow profile body (8), which has the helically formed longitudinal shape, wherein the hollow profile body (8) is embedded in the material forming the screw flight (4). The invention also relates furthermore to an installation and also to a method for operating an installation with such a screw (1).