Soft Magnetic Intermediate Product Grain Control
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Solution Overview
Problem
Existing methods for producing soft magnetic intermediate products require complex and expensive special annealing of end products to achieve optimal soft magnetic properties, which is time-consuming and inefficient.
Innovation Solution
A method involving the production of a rollable metallic blank with isotropic properties, where the blank is prerolled to an intermediate thickness with a critical or postcritical degree of deformation, followed by heat treatment and subsequent rolling to the final thickness with critical or postcritical degree of rolling, enabling grain growth and improved magnetization properties without the need for subsequent special annealing of end products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cold rolling with low deformation is used to enhance grain growth and magnetizability, then soft magnetic properties are improved, but complex and expensive special annealing of end products is required
Solution Approach 1:
The invention performs preliminary actions during the intermediate product production stage by controlling the rolling degree to be at least the critical rolling degree, which preliminarily establishes the grain structure and soft magnetic properties. This preliminary action eliminates the need for subsequent special annealing of end products, as the material is pre-conditioned to maintain its magnetic properties through further processing.
Solution Approach 2:
The invention extracts the complex special annealing step from the end product processing sequence by incorporating the necessary heat treatment and grain structure control into the intermediate product manufacturing process. This extraction eliminates the need for individual annealing of each end product, simplifying the overall production流程.
2Manufacturing precision
If conventional methods with multiple rolling passes and final annealing are used, then desired thickness and recrystallization are achieved, but production time and cost increase
Solution Approach 1:
The invention performs preliminary rolling with controlled degree of deformation (at least critical rolling degree) during the intermediate product stage to preliminarily establish the grain structure. This preliminary action on grain growth and magnetic properties eliminates the need for subsequent special annealing of end products, thereby reducing production time while maintaining manufacturing precision.
3Reliability
If end products are subjected to special annealing after forming, then optimal soft magnetic properties are achieved, but production cost and complexity increase
Solution Approach 1:
The invention performs preliminary establishment of grain structure and magnetic properties during intermediate product production by controlling the rolling degree to be at least the critical rolling degree. This preliminary action ensures that end products inherit good soft magnetic properties, eliminating the need for complex post-forming annealing operations and significantly easing the manufacturing process.
4Reliability
If deformation is avoided during further processing, then magnetizability is maintained, but manufacturing flexibility is reduced
Solution Approach 1:
The invention performs preliminary establishment of a robust grain structure and magnetic properties during intermediate product production by controlling the rolling degree to be at least the critical rolling degree. This preliminary action creates a material that is inherently resistant to deformation-induced magnetic property degradation, allowing end products to undergo various forming operations (stamping, bending, deep-drawing) while maintaining good magnetizability, thus increasing manufacturing flexibility.
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
This method allows for the production of intermediate products with adjustable grain size and magnetic properties, enabling efficient further processing into end products with good soft magnetic properties without requiring additional annealing, thus reducing production costs and time.
Implementation Method 1
the blank is heat-treated, preferably annealed in a recrystallizing manner
Implementation Method 2
subsequent final annealing such that the rolled structure recrystallizes
Implementation Method 3
The degree of deformation during prerolling is matched to a critical or postcritical degree of rolling to be set in a subsequent rolling
Implementation Method 4
By rolling with the critical or postcritical degree of rolling and the subsequent annealing, grain growth is brought about in the metallic structure, which enables easier and faster magnetization and demagnetization of the material
Data Source
AI summary
A method of making a soft magnetic intermediate product of metal with particularly good magnetization behavior, the method comprising the following method steps:production or provision of a metallic, rollable blank of a metallic product,preliminary rolling of the metallic blank with a defined degree of deformation to an intermediate thickness, the degree of deformation being matched to a critical or postcritical degree of rolling to be observed during subsequent rolling,heat treatment of the prerolled blank, preferably annealing of the prerolled blank,rolling of the blank with a critical or postcritical degree of rolling to a final thickness and subsequent annealing to set a defined grain size andfinishing of the intermediate product.