Surface Protection Sheet for Metal Plate Punching and Bending
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Solution Overview
Problem
Existing surface protection sheets for metal plates during punching and bending processes either fail to prevent the chip-up phenomenon or lead to bending scratches, and their application is often cumbersome and inefficient.
Innovation Solution
A surface protection sheet with a support base material and adhesive layer, characterized by specific coefficients calculated by the formulae (I) = thickness of support base material × elongation at break (%) and (II) = thickness of support base material × strength at break (N/20 mm), where (I) is not more than 21.0 and (II) is not less than 4.0, to prevent chip-up and bending scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the surface protection sheet is increased to prevent bending scratches, then the protection against bending scratches is improved, but the chip-up phenomenon becomes more remarkable during punching
Solution Approach 1:
The invention changes the physical parameters of the surface protection sheet by specifying precise ranges for thickness (0.02-0.2 mm), elongation at break (50-300%), and tensile strength (20-500 N/20 mm). These parameter changes allow the sheet to be thin enough to prevent chip-up while maintaining sufficient strength and elongation to prevent bending scratches, thus resolving the contradiction between the two harmful factors.
Solution Approach 2:
The surface protection sheet is constructed as a composite material with specific polymer compositions including polyolefin, plasticized polyvinyl chloride, polyurethane, or acrylic resin. This composite structure provides both the necessary mechanical properties (strength and elongation) and dimensional stability to simultaneously prevent chip-up phenomenon and bending scratches, addressing the contradiction between protection effectiveness and punching performance.
2Object-generated harmful factors
If the thickness of the surface protection sheet is reduced to suppress the chip-up phenomenon, then the chip-up phenomenon is suppressed, but the base material is torn and bending scratches occur during bending
Solution Approach 1:
The invention specifies precise parameter ranges: thickness of 0.02-0.2 mm, elongation at break of 50-300%, and tensile strength of 20-500 N/20 mm. These parameter changes enable the sheet to maintain sufficient mechanical strength and ductility even at reduced thickness, preventing both chip-up phenomenon and bending scratches simultaneously.
Solution Approach 2:
The invention applies local quality by ensuring the surface protection sheet has differentiated properties: sufficient thickness and strength in critical areas to prevent bending scratches, while maintaining overall thinness to avoid chip-up. The specific elongation and strength ranges allow the material to locally adapt to bending stresses without tearing or causing scratches.
3Object-affected harmful factors
If a surface protection sheet is applied manually before stacking to prevent scratches, then scratches during stacking are prevented, but the attaching operation becomes considerably troublesome and time-consuming
Solution Approach 1:
The surface protection sheet is designed as a disposable protective layer that is applied to the metal plate, performs its protective function during punching and bending, and is then removed or discarded. This eliminates the need for complex reusable protective systems and manual reapplication, reducing time loss while effectively preventing stacking scratches.
Solution Approach 2:
The surface protection sheet is applied in advance to the metal plate before punching and bending operations. This preliminary action ensures the surface is protected from chip-up and bending scratches before the harmful effects can occur, eliminating the need for post-processing protection and reducing overall operation time.
Data Source
AI summary
A work subject material comprising a metal plate for use in punching and/or bending and, attached thereto, a surface protection sheet, characterized in that the surface protection sheet comprises a support base material and an adhesive layer superimposed on one surface of the support base material and that the surface protection sheet exhibits a coefficient (I) not more than 21.0, a coefficient (II) not less than 4.0 and a coefficient (III) not more than 1.5, which are calculated by the following formulae: (I)=thickness of support base material (mm)×elongation at break of surface protection sheet (%); (II)=thickness of support base material (mm)×strength at break of surface protection sheet (N/20 mm); and (III)=coefficient (I)/coefficient (II).