Oscillation-Wound Metal Strip Coil End-Turnback Layout
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Solution Overview
Problem
The oscillation wound metal strip coils tend to swell at the end portions due to the reversal of the metal strip during the winding process, leading to deterioration in the final shape of the coil, which existing technologies fail to adequately address.
Innovation Solution
The metal strip is wound around a winding core at a tilted angle, with turnback portions formed in a multistage manner from the inner to the outer circumference, where the angle between turnback portions is carefully controlled to prevent overlap and swelling, and an overlapping portion is introduced to manage the winding tension effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the metal strip is reciprocated and wound in the conventional oscillation winding method, then productivity is improved by winding a long metal strip into one coil, but the end portions of the coil swell and the final shape deteriorates
Solution Approach 1:
The turnback portions are divided into multiple stages from the inner circumference toward the outer circumference of the coil. This segmentation prevents concentration of stress and swelling at single points, distributing the winding tension evenly across multiple sections to maintain coil shape integrity while achieving long-strip winding
Solution Approach 2:
The line connecting the midpoint of the arcuate turnback portions with the center of the arc is designed to rotate stepwise in one direction, creating an asymmetric pattern. This asymmetric arrangement prevents overlapping of turnback portions and eliminates the swelling effect at coil end portions, while still enabling continuous oscillation winding for high productivity
2Ease of manufacture
If the metal strip is turned back at end portions during winding, then the metal strip can be wound into a coil form, but swelling occurs at both end portions causing shape deterioration
Solution Approach 1:
The turnback portions are designed with arcuate (curved) shapes rather than sharp angles. This curvature distributes the stress and deformation more evenly during the turnback process, preventing localized swelling at the end portions while maintaining the ability to wind the strip into coil form
Solution Approach 2:
The multistage turnback portions are formed in advance from the inner circumference toward the outer circumference, preparing the path for subsequent winding layers. This preliminary arrangement prevents overlapping and swelling by pre-establishing proper spacing and orientation before the actual winding occurs
Data Source
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AI summary
The present invention provides a metal strip coil that can suppress a shape failure at an end portion of the coil. A metal strip coil including a metal strip wound around a winding core, wherein the metal strip is wound from one end side toward the other end side of the winding core, turns back at the other end portion, is wound from the other end side toward the one end side of the winding core, turns back at the one end portion, and is repeatedly wound in such a manner, wherein in the turnback, the metal strip has a turnback portion at which the metal strip is wound in a direction perpendicular to the axial direction of the winding core, in a side view of the metal strip coil, the turnback portion is arcuate, and the turnback portions are formed in a multistage manner from the inner circumference toward the outer circumference, and a line connecting a midpoint of the arcuate arc with the center of the arc is formed so as to rotate stepwise in one direction, in an order of the arcuate turnback portions which are formed in a multistage manner from the inner circumference to the outer circumference.