Fe-Ni Alloy Thin Plate Processing for Isotropic Mechanical Properties
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fe-Ni-based alloy thin plates used for lead frames or metal masks face challenges in maintaining dimensional tolerance and mechanical property consistency after cutting, with existing methods not effectively addressing variations in properties.
Innovation Solution
A method involving hot-rolling with specific composition (35.0-43.0% Ni+Co, limited Si and Mn, and impurities like S and B) followed by cold rolling with a reduction ratio of at least 85% before recrystallization annealing at 800°C, and final cold rolling with controlled tension and speed to minimize anisotropy and achieve isotropic mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cold rolling with high reduction ratio and annealing is conducted to improve etching accuracy, then etching properties are improved, but variation of thin plate properties after cutting increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the annealing temperature (800-950°C) and reduction ratios in cold rolling to achieve optimal crystal orientation. By adjusting these parameters, the patent improves etching accuracy while simultaneously reducing property variation after cutting, resolving the technical contradiction between manufacturing precision and material stability
Solution Approach 2:
The patent implements local quality by creating specific crystal orientation distributions through controlled cold rolling and annealing processes. The crystal grains are oriented in specific directions to provide both good etching properties and consistent mechanical properties across different cutting directions, addressing the contradiction between etching accuracy and property stability
2Manufacturing precision
If cold rolling with reduction ratio of not less than 90% is conducted before last recrystallization annealing, then etching accuracy is improved, but anisotropy of mechanical properties increases
Solution Approach 1:
The patent employs composite material principles by creating a microstructure with specific crystal orientation distributions through controlled rolling and annealing. The resulting material exhibits composite-like properties where different crystal orientations contribute to both etching accuracy and reduced mechanical anisotropy, resolving the contradiction between precision and strength uniformity
Solution Approach 2:
The patent uses parameter changes by optimizing the annealing temperature range (800-950°C) and controlling the reduction ratio sequence to achieve a crystal structure that provides both high etching accuracy and isotropic mechanical properties. This resolves the contradiction between improving etching precision and maintaining mechanical property uniformity
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
The method produces Fe-Ni-based alloy thin plates with minimal variation in mechanical properties between cutting directions, ensuring good processability and reduced anisotropy, thereby enhancing dimensional accuracy and shape consistency.
Implementation Method 1
cold rolling with a reduction ratio of at least 85% before recrystallization annealing at 800°C
Data Source
AI summary
Provided are an Fe-Ni-based thin plate capable of having isotropic mechanical characteristics even if the plate is widened, and a method for producing the same. The Fe-Ni-based alloy thin plate and the method for producing the Fe-Ni-based alloy thin plate are characterized by the following: the thin plate is formed of, in terms of mass percentage, 35.0-43.0% of Ni + Co (Co is 0-6.0%), 0.5% or less of Si, 1.0% or less of Mn, with the remainder being Fe and impurities; a hot-rolled material is used as a material for cold rolling; first cold rolling is conducted on the material for cold rolling, with a rolling reduction ratio of 85% or higher; after the first cold rolling, recrystallization sintering is conducted on such material under conditions where the temperature is 800oC or higher and the retention time is 0.1-1.2 minutes; after the recrystallization sintering, a final cold rolling is conducted on such material with a rolling reduction ratio of 40% or less to obtain a Fe-Ni-based alloy thin plate having a thickness of 0.25 mm or less; and no heat treatment is conducted after the final cold rolling.