Four-Roll Skew Rolling for Ultrafine-Grained M50NiL Rods
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Solution Overview
Problem
Conventional rolling technologies are ineffective in refining the grain structure of metal rods, particularly in soft aluminum rods, leading to undesirable shapes and significant wear due to sticking during the rolling process, and fail to produce large-sized rods with enhanced mechanical properties.
Innovation Solution
A rolling mechanism comprising two main rolls and two auxiliary rolls, arranged at 90° intervals, with truncated cones and protrusions to form a nip zone, allowing for adjustable distances and velocities, which enhances grain refinement and prevents sticking, producing large-sized metal rods with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rolling technology is used, then the rolling process is simple, but the grain structure cannot be refined and the rod shape becomes undesirable due to sticking
Solution Approach 1:
The rolling mechanism is divided into multiple independent rolls (first rolling roll, second rolling roll, third rolling roll, fourth rolling roll) arranged in a specific spatial configuration. Each roll can be independently controlled, allowing complex deformation patterns to be achieved through coordinated action of multiple simpler components, thus refining grain structure without creating an unmanageably complex system
Solution Approach 2:
The patent introduces a spatial dimension to the rolling process by arranging rolls at specific angles (90 degrees between first and second rolls, 90 degrees between third and fourth rolls) and positions (with protrusion portions at different locations). This multi-dimensional arrangement creates complex stress states that refine grain structure while maintaining controllable device geometry
2Reliability
If conventional rolling is used, then the equipment is simple to operate, but significant wear and tear occurs on the mold due to sticking
Solution Approach 1:
The rolling mechanism employs dynamic control of multiple rolls with different rotation speeds and directions. The first and second rolls rotate in one direction while the third and fourth rolls rotate in the opposite direction, creating dynamic material flow that prevents sticking. This dynamic operation maintains reliability while being manageable through coordinated control
Solution Approach 2:
The protrusion portions on the rolls act as intermediaries that control material flow and distribution during rolling. These protrusions create localized deformation zones that prevent uniform sticking across the entire contact surface, reducing wear while maintaining operational simplicity through geometric design
3Strength
If conventional rolling is used, then the process is straightforward, but large-sized rods cannot be produced with enhanced mechanical properties
Solution Approach 1:
The rolling mechanism uses asymmetric arrangements of rolls with different functions and positions. The first and second rolls are arranged perpendicular to the third and fourth rolls, creating asymmetric stress distribution that enhances grain refinement and mechanical properties. This asymmetric configuration enables production of large-sized rods with improved strength while keeping the device structure organized and manageable
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 mechanism achieves grain refinement and produces ultra-fine-grained M50NiL rods with enhanced tensile strength and toughness, overcoming sticking issues and enabling large-sized metal rod production with low load.
Implementation Method 1
a first line connecting the central axes of the two main rolls is perpendicular to a second line connecting the central axes of the two auxiliary rolls... where a billet is rolled into a rod
Data Source
AI summary
The disclosure provides a rolling mechanism for grain refinement of an M50NiL rod. The rolling mechanism includes two main rolls and two auxiliary rolls. The two main rolls are opposite to each other and the two auxiliary rolls are opposite to each other, and the two main rolls and the two auxiliary rolls are disposed around a rolling line to form a nip zone. In any cross section of the nip zone with the rolling line as a normal line, a first line connecting the central axes of the two main rolls is perpendicular to a second line connecting the central axes of the two auxiliary rolls; each main roll further includes a first protrusion portion, a first end portion and a second end portion. The first end portion and the second end portion are disposed opposite each other along a corresponding roll axis.