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 with a tilted angle, featuring multistage turnback portions where the metal strip is wound perpendicular to the core's axis, and the angle between turnback portions is strategically adjusted to prevent overlapping, using equations to derive optimal angles and spacings that exclude divisors of 360 degrees, ensuring an adequate wound shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the metal strip is reciprocated and wound with reversal at end portions, then the metal strip can be wound into a long coil, but the end portions swell and the coil shape deteriorates
Solution Approach 1:
The turnback portions are divided into multiple stages (first stage, second stage, third stage) arranged from inner circumference to outer circumference. Each stage has a different angle between turnback portions (30°, 45°, 60° respectively), creating segmented angular distribution that prevents overlapping and suppresses swelling at the coil end portions while maintaining the ability to wind long coils.
2Ease of manufacture
If the turnback portions are arranged at regular angular intervals, then the winding process is simple, but the turnback portions overlap and cause swelling
Solution Approach 1:
The angles between turnback portions are made asymmetric and irregular (30°, 45°, 60°) rather than uniform. This asymmetric angular distribution prevents the turnback portions from overlapping at the coil end portions, thereby suppressing swelling while still maintaining a relatively simple winding process through systematic angle selection.
Data Source
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.