Movable Sheet Holder Timing for Flat Thin-Sheet Perforation
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Solution Overview
Problem
Existing perforating presses face challenges with deformation and friction issues when perforating thin sheet materials with high-density perforation patterns, as fixed sheet holders fail to account for material tolerances and generate sufficient compressive force, leading to raised edges and material deformation.
Innovation Solution
A perforating press with a movable sheet holder positioned between the punch holder and die, driven by a transmission shaft, allowing adjustable contact with the sheet material based on the perforation pattern and thickness, utilizing a hydraulic cylinder for preload to maintain contact and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed sheet holder is used to hold back the sheet material during perforation, then the sheet material is prevented from deforming, but the sheet holder generates too much friction requiring excessive energy and possibly damaging the sheet material
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 force with the sheet material during the perforation cycle, replacing the static fixed attachment with a dynamic controllable system
2Manufacturing precision
If a sheet holder is pressed strongly against the sheet material to prevent deformation, then the sheet material remains flat during perforation, but moving the sheet material requires too much energy and may damage the sheet material
Solution Approach 1:
The sheet holder applies contact force periodically only during the punching phase when punches are in contact with the sheet material, and releases contact during the feeding phase, creating a cyclic pattern of engagement and disengagement that prevents continuous friction damage
3Use of energy by moving object
If a spring-attached sheet holder is used to allow movement, then the sheet material can move more easily, but the sheet holder cannot develop sufficient compressive force to prevent deformation of very thin sheet material
Solution Approach 1:
The spring-based mechanical attachment is replaced with a transmission shaft-driven system that uses mechanical advantage and phase-shifted motion to provide controlled compressive force, substituting elastic force with a more precise mechanical actuation system
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 by optimizing the contact time of the sheet holder with the sheet material, particularly effective for thin materials with high-density perforation patterns.
Implementation Method 1
a transmission shaft for converting a rotary movement of the transmission shaft into a linear displacement of the punch holder in a stroke direction
Implementation Method 2
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
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.