Internally Cooled Valve Tapering With Matrix Support Against Buckling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing hollow internally cooled valves face challenges such as buckling and bulging due to lack of support during the tapering process, limiting the degree of tapering and requiring multiple stages, which increases the complexity and pressure required.
Innovation Solution
A matrix design with a reduced conical section and a transition section between two tapering stages, along with a calibration section and a movable calibration mandrel, is used to gradually reduce the valve stem section's diameter, allowing for a higher degree of tapering with reduced pressure and preventing buckling, while maintaining a smooth outer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tapering is performed without support in front of the matrix opening, then the process can be combined with other methods, but buckling or bulging occurs when the free length is too great or the wall thickness is too small
Solution Approach 1:
A support device is introduced as an intermediary element between the stem and the matrix during tapering. This support device prevents buckling and bulging by providing necessary support to the stem in front of the matrix opening, while allowing the tapering process to proceed effectively. The support device acts as a mediator that enables both process versatility and stem stability.
2Productivity
If the degree of tapering is increased to reduce the number of tapering sections, then the compression load increases and may cause buckling or compression of the valve stem
Solution Approach 1:
The support device serves as a mediator that enables higher degrees of tapering by preventing buckling under compression load. This allows the process to achieve the desired tapering in fewer sections while maintaining stem integrity throughout the operation.
Solution Approach 2:
The support device is positioned and prepared before the tapering operation begins. This preliminary setup ensures that the stem is properly supported from the start, preventing buckling even when high compression loads are applied to achieve greater tapering in fewer sections.
3Stability of the object's composition
If multiple tapering stages are used to prevent buckling, then the stem stability is maintained, but the process complexity and required pressure increase
Solution Approach 1:
The support device acts as a mediator that enables single-stage or reduced-stage tapering by providing continuous support throughout the process. This eliminates the need for multiple tapering stages while maintaining stem stability, thereby reducing process complexity and required pressure.
4Stability of the object's composition
If multiple tapering stages are used to prevent buckling, then the stem stability is maintained, but the required pressure increases
Solution Approach 1:
The support device serves as a mediator that reduces the required tapering pressure by preventing buckling during the process. This allows the system to achieve the desired tapering with lower pressure compared to multiple unstaged operations, while maintaining stem stability throughout.
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
The method enables a higher degree of tapering with reduced pressure and friction, allowing for the efficient shaping of valve preforms into valve blanks with improved structural integrity and surface quality.
Implementation Method 1
an essentially rod- or tube-shaped valve stem section is pressed into an undersized conical hole, as the result of which a diameter of the valve stem section is reduced and a length of the valve stem section simultaneously increases due to conservation of mass
Implementation Method 2
The calibration mandrel is pulled through the stem and out of the stem end. During the calibration, the stem section is elongated, since a portion of the material of the stem is displaced in the direction of the stem end during the calibration
Implementation Method 3
The stem area in front of the opening or the reduced conical section is subjected to compression load during the tapering
Data Source
AI summary
A matrix for shaping a valve preform has a circular through opening and a reduced conical section. The reduced conical section tapers from an outer diameter to a reduced cone inner diameter, the outer diameter being greater than or equal to the initial outer diameter of the valve preform, and the matrix inner diameter being smaller than the initial outer diameter.