Movable Sheet Holder for Flat, Low-Friction Perforating Presses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing perforating presses face challenges in maintaining sheet material flatness during perforation, especially with thin materials and high-density perforation patterns, due to deformation and friction issues, which are not adequately addressed by traditional fixed sheet holders.
Innovation Solution
A perforating press design where the sheet holder is movable by a transmission shaft, allowing adjustable contact with the sheet material based on the perforation pattern and thickness, using a hydraulic cylinder for preload to prevent deformation and minimize friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sheet holder is fixed to the punch press or die, then the sheet material is held back during perforation, but the sheet material deforms and does not remain flat
Solution Approach 1:
The sheet holder is made movable in the stroke direction by the transmission shaft, allowing it to dynamically adjust its position and contact pressure with the sheet material during the perforation cycle, preventing deformation while maintaining perforation accuracy
Solution Approach 2:
The contact force and position of the sheet holder are changed as variables during the perforation process, allowing optimization of holding pressure to prevent sheet material deformation without causing excessive friction or deformation
2Stability of the object's composition
If the sheet holder is pressed strongly against the sheet material, then the sheet material is held back sufficiently, but too much friction is created requiring too much energy and possibly damaging the sheet material
Solution Approach 1:
The sheet holder's contact pressure is dynamically adjusted during the perforation cycle rather than being constantly high, reducing friction and energy consumption while maintaining sheet material stability when needed
Solution Approach 2:
The sheet holder applies holding pressure periodically only during the perforation stroke when needed, and releases during the return stroke, reducing overall friction and energy consumption while maintaining sheet flatness during critical operations
3Adaptability or versatility
If the sheet holder is attached by springs, then the sheet holder can move with the punch holder, but the sheet holder cannot develop sufficient compressive force for very thin sheet material
Solution Approach 1:
The spring-based mechanical attachment is replaced with a transmission shaft-driven mechanical system that can deliver sufficient compressive force to the sheet holder, enabling adequate holding pressure on very thin sheet material while maintaining movement flexibility
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
Enables efficient and friction-free movement of sheet material during perforation, maintaining flatness and preventing deformation, particularly effective for thin materials with high-density perforation patterns, as demonstrated in the manufacture of grilles for household appliances.
Implementation Method 1
at least one hydraulic cylinder is arranged between the sheet holder and the ram element for preloading the sheet holder in the direction of the die
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a perforating press for perforating sheet material comprising a feeding means for feeding sheet material in a first direction; at least one punch holder, wherein the punch holder extends in a second direction transverse to the first direction, and wherein the punch holder comprises at least one punch; a die, wherein the die comprises openings for receiving punches of the punch holder a transmission shaft for linear displacement of the punch holder in a stroke direction transverse to the first and second directions; and a discharge means for discharging perforated sheet material; wherein the perforating press comprises a sheet holder, wherein the sheet holder is positioned between the punch holder and the die according to the stroke direction, wherein the sheet holder is movable according to the stroke direction by the transmission shaft, and wherein the sheet holder comprises cut-outs for passage of punches of the punch holder. The invention also relates to a method and a use.