Additive Valve Housing Geometry With Controlled Overhang Angles
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Solution Overview
Problem
Conventional manufacturing processes for control valve housings face challenges such as geometric deviations during additive manufacturing, requiring complex post-processing and support structures that are difficult to remove, leading to increased costs and potential functional impairments.
Innovation Solution
The development of a semi-finished product for control valve housings formed through additive manufacturing, with a built-up direction that limits overhang angles to an angular threshold, ensuring minimal post-processing and maintaining manufacturing tolerances, using metal materials with specific particle size distributions and avoiding overhang angles greater than 75°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additive manufacturing is used to produce control valve housings with complex geometries, then manufacturing flexibility and design freedom are improved, but geometric deviations and surface quality deteriorate due to overhang angles exceeding threshold values
Solution Approach 1:
The patent applies dynamics by making the support structure removable after additive manufacturing. The support structures are designed to be temporarily present during manufacturing to enable complex geometries, then removed afterward to achieve the final functional form. This temporary-dynamic approach allows the system to adapt between manufacturing requirements and operational requirements.
Solution Approach 2:
The patent uses support structures as intermediary elements during the additive manufacturing process. These intermediaries enable the formation of overhang surfaces that would otherwise be impossible to create, acting as temporary mediators between the manufacturing process and the final product geometry.
2Ease of manufacture
If support structures are added during additive manufacturing to enable complex geometries, then manufacturing feasibility is improved, but device complexity and post-processing difficulty worsen due to difficult removal
Solution Approach 1:
The patent applies the extraction principle by removing the support structures after they have served their manufacturing purpose. The support structures are taken out from the final product, leaving only the functional housing geometry. This separation allows complex manufacturing to be achieved without permanently complicating the final device.
3Manufacturing precision
If post-processing machining is performed on additively manufactured housings, then surface quality and sealing accuracy are improved, but manufacturing time and cost worsen
Solution Approach 1:
The patent applies preliminary action by optimizing the additive manufacturing process parameters before actual manufacturing occurs. The build orientation, support structure design, and process parameters are predetermined to minimize post-processing requirements. This preliminary optimization reduces the need for subsequent machining operations.
4Device complexity
If overhang angles are increased to reduce manufacturing steps, then device complexity is reduced, but manufacturing precision deteriorates due to geometric deviations
Solution Approach 1:
The patent applies parameter changes by systematically varying the overhang angle parameter within a controlled range (0-75 degrees). By optimizing this parameter, the patent finds the optimal balance between manufacturing feasibility and geometric precision, avoiding both excessive complexity and excessive deviation.
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 ensures precise geometric control, reduces the need for post-processing, and maintains manufacturing tolerances, thereby enhancing the functionality and reliability of control valve housings.
Implementation Method 1
the body of which is formed in layers with the aid of an additive manufacturing process
Data Source
AI summary
In a semi-finished product for a valve housing, such as a control valve housing or a fitting housing, may include an additively manufactured body having a built-up direction in which the body is formed in layers. The body may include an inlet channel, an outlet channel, a bridge section, and a neck portion for the valve or the fitting delimiting a channel structure to be formed for process fluid. The body forms an inner surface to be directed towards a process fluid and an outer surface to be facing the surroundings. The inner or outer surface may have at least one overhang surface with respect to the built-up direction, the overhang angle of which does not exceed an angular threshold value of at most 75°.