Annular Workpiece Rolling With Investment Protection for Patterned Surfaces
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Solution Overview
Problem
Existing methods for forming annular objects, such as rings and bracelets, face challenges in achieving high strength and complex ornamental patterns while maintaining structural integrity and avoiding deformation or damage.
Innovation Solution
A rolling apparatus that uses an investment material to wrap the outer surface of an annular workpiece, allowing a cylindrical rolling wheel to roll on the inner surface, thereby increasing density and protecting ornamental patterns, while the inner surface is exposed through a central hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If casting method is used to form annular objects, then complex ornamental patterns can be achieved, but the internal structure becomes loose and low-density resulting in reduced hardness and mechanical strength
Solution Approach 1:
The investment material is applied to the outer surface of the annular workpiece before the rolling process to protect the ornamental patterns during density enhancement. This preliminary protective action allows subsequent rolling to increase internal density without damaging the already-formed ornamental surface
Solution Approach 2:
The rolling process changes the density parameter of the annular workpiece by applying mechanical pressure through the rolling wheel, transforming the loose internal structure into a dense, high-strength structure while maintaining the ornamental surface integrity
2Strength
If forging method is used to form annular objects, then higher internal density and hardness are achieved, but the structural design is limited to simple forms and welded joints become susceptible to fracture
Solution Approach 1:
The investment material is pre-applied to capture complex ornamental patterns on the outer surface before rolling, enabling sophisticated structural designs that would be difficult to achieve with traditional forging while still achieving high density and strength through the subsequent rolling process
3Strength
If stamping method is used to form annular objects, then higher density is achieved compared to casting or forging, but the ornamental details are difficult to achieve and the material tends to crack during stamping creating burrs
Solution Approach 1:
The investment material is applied in advance to protect and preserve the ornamental surface during the rolling process, enabling the use of rolling (which provides high density like stamping) without the cracking and burr problems associated with stamping, while maintaining fine ornamental details through the protective investment layer
4Strength
If rolling process is applied to increase density of annular workpiece, then mechanical strength is improved, but the ornamental patterns on the outer surface may be damaged or distorted
Solution Approach 1:
The investment material serves as an intermediary protective layer between the rolling wheel and the ornamental surface of the annular workpiece. This intermediary layer absorbs and distributes the mechanical pressure during rolling, preventing direct contact and potential damage to the ornamental patterns while still allowing sufficient pressure transmission to increase internal density
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 apparatus enhances the structural strength and hardness of annular workpieces by increasing density and stabilizing the rolling process, while preserving ornamental details on the outer surface.
Implementation Method 1
a cylindrical rolling wheel... rolls on the inner circumferential surface of the annular workpiece to increase the density of the annular workpiece
Implementation Method 2
the outer circumferential surface of the annular workpiece is wrapped and protected by the investment material
Data Source
AI summary
A rolling apparatus for an annular workpiece includes roller, a rolling wheel device, a base, and a stand. The roller has two circular frames that holds the annular workpiece therein using removable fixing members. After an outer circumferential surface of the annular workpiece is tightly wrapped by an investment material, the fixing members are removed to leave a through hole at the center of the investment material and the annular workpiece has its inner circumferential surface exposed at the through hole. The cylindrical rolling wheel of the rolling wheel device passes through the through hole of the investment material and rolls on the inner circumferential surface of the annular workpiece against a rolling platform of the base to increase the density of the annular workpiece. During the rolling operation, the investment material positions the annular workpiece and protects textures and patterns preformed on the outer circumferential surface.