Die Apparatus Protruding Part Reduces Stripper Flexure
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Solution Overview
Problem
Conventional die apparatuses experience flexure issues during air punching, leading to chipping of punches and dies, especially when forming caulking protrusions, due to uneven press loads and large workpiece dimensions, which complicates the control of bottom dead center positioning.
Innovation Solution
A die apparatus with a protruding part on the stripper or lower die is used to reduce flexure during air punching, positioned in a previously blanked region or capable of projection from the die surface, effectively preventing chipping and maintaining uniform press loads by reducing stripper flexure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air punching is performed without a workpiece, then the die apparatus can operate without material, but the stripper flexes and causes punch displacement and chipping
Solution Approach 1:
A support plate is introduced as an intermediary element between the stripper and the die during air punching operations. The support plate receives the press load from the stripper and transfers it to the die, preventing stripper flexure and punch displacement without requiring a workpiece, thereby eliminating chipping while maintaining productivity
Solution Approach 2:
The support plate is positioned in advance at the location where the workpiece would normally be placed. During air punching, it preliminarily establishes the correct load path and prevents stripper flexure before the actual blanking operation, ensuring punch and die protection is already in place
2Productivity
If the stripper width is increased to accommodate large or multi-row laminated iron cores, then more workpieces can be processed, but stripper flexure becomes more remarkable
Solution Approach 1:
The support function is segmented into multiple support plates that can be distributed across the wide stripper width. Each support plate locally receives press load, preventing cumulative flexure across the entire stripper width, thereby maintaining stability while enabling multi-row blanking capability
Solution Approach 2:
Multiple support plates are introduced as intermediary elements distributed across the wide stripper. These plates transfer press load locally to the die, preventing stripper flexure even at large widths, thereby enabling multi-row blanking without compromising stripper stability
3Ease of manufacture
If many springs are arranged in the periphery of the punch to form caulking protrusions, then the caulking function is improved, but stripper flexure in the caulking region becomes remarkable
Solution Approach 1:
A support plate is positioned to provide local support beneath the stripper at the caulking region. This intermediary element receives and distributes the concentrated press load from the springs, preventing localized stripper flexure while maintaining the caulking protrusion formation capability
Solution Approach 2:
The support function is applied locally at the caulking region where it is most needed. The support plate provides targeted load distribution only at the critical caulking area, maintaining stripper stability where flexure is most remarkable while preserving the ease of manufacture for caulking protrusions
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 solution significantly reduces stripper flexure and prevents chipping of punches and dies, ensuring consistent blanking quality and flexibility in installation positions, particularly when forming caulking protrusions for laminated iron cores.
Implementation Method 1
a press load of the stripper for pressing the workpiece described above is applied by an elastic force of a spring
Data Source
AI summary
A die apparatus includes an upper die and a lower die used for blanking a thin plate, a stripper which is formed on the upper die and is arranged between the upper die and the lower die, and a punch which blanks a part of the thin plate. The stripper or the lower die is provided with a protruding part which reduces flexure of the stripper occurring when a test punching is performed by actuating the punch without the thin plate.