Ironing Punch Surface Structure for Low-Friction Extraction
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Solution Overview
Problem
The existing ironing process faces challenges with the punch being difficult to pull out from the thinned metal cylinder due to high frictional resistance, leading to reduced productivity and potential damage to the inner surface of the metal cylinder.
Innovation Solution
The ironing punch is designed with dot-shaped recesses on its outer surface, featuring a raised portion on the peripheral edge, which reduces the contact area and frictional resistance, allowing for smoother extraction after ironing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the punch outer surface is smooth and continuous, then the ironing process maintains good contact with the workpiece for effective thinning, but the frictional resistance increases making punch extraction difficult
Solution Approach 1:
The punch outer surface is segmented into multiple dot-shaped protrusions instead of being continuous. This segmentation reduces the contact area between the punch and workpiece, thereby reducing frictional resistance and facilitating punch extraction while maintaining sufficient contact for effective ironing
Solution Approach 2:
The punch surface is designed with localized dot-shaped protrusions that provide concentrated contact points for effective ironing while leaving gaps between them to reduce overall frictional resistance. This local quality modification allows the surface to serve dual functions: maintaining ironing effectiveness while reducing extraction difficulty
2Manufacturing precision
If the contact area between punch and workpiece is increased, then the ironing effectiveness is improved, but the frictional resistance increases causing productivity reduction
Solution Approach 1:
The continuous contact surface is segmented into discrete dot-shaped protrusions. This segmentation reduces the total contact area and thus frictional resistance, enabling faster punch extraction and improved productivity while the distributed protrusions maintain sufficient contact for effective thinning
Solution Approach 2:
The surface geometry parameter is changed from continuous to discrete dot-shaped protrusions with specific dimensions (diameter 0.5-2.0mm, height 0.1-1.0mm). This parameter change optimizes the balance between contact area for ironing effectiveness and frictional resistance for productivity
3Ease of operation
If the punch is pulled out with high force, then the punch can be extracted from the workpiece, but the inner surface of the metal cylinder may be damaged
Solution Approach 1:
The segmented dot-shaped protrusions reduce the contact area and thus the total frictional force. This allows the punch to be extracted with lower pulling force, preventing damage to the workpiece inner surface while still enabling complete extraction
Solution Approach 2:
The frictional resistance, which is normally a harmful factor preventing punch extraction, is converted into a beneficial feature by using dot-shaped protrusions that create controlled contact points. These protrusions provide sufficient friction for ironing effectiveness while reducing overall friction to enable easy extraction without damage
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 design enhances the pulling-out property of the punch, increasing productivity and preventing damage to the metal cylinder's inner surface by reducing frictional resistance and allowing for efficient ironing operations.
Implementation Method 1
an inner surface of a body portion of the metal cylinder as a workpiece is strongly pressed against an outer peripheral surface of the punch, thus a large frictional resistance is exerted
Data Source
AI summary
In an ironing punch to be used for metal ironing, a dot-shaped recess is distributed on an outer peripheral surface of the ironing punch, and a raised portion is formed on at least part of a peripheral edge portion of the dot-shaped recess.