Wheel Rim Spinning Chuck Structure for Faster Thin-Wall Forming
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Solution Overview
Problem
Conventional spinning methods for forming wheel rims are inefficient due to lengthy processes and the difficulty in using a common die for various wheel rim formations, as they require multiple steps and result in a complex die configuration.
Innovation Solution
A spinning apparatus and method utilizing a spindle-side chuck with a conical concavity, a mandrel with a conical convexity, and a spinning roll to clamp and reduce the thickness of a tube material, allowing for secure clamping and easy formation of various wheel rims by simplifying the clamping structure and reducing the number of forming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional die with multiple inclined portions and intermediate forming portions is used to form different workpiece portions, then various wheel rim configurations can be formed, but the die structure becomes complex and cannot be commonly used for various wheel rims
Solution Approach 1:
The patent applies universality by designing a single die structure that can form multiple different workpiece portions (first, second, and third portions with different thicknesses) through a unified forming mechanism. The die includes a forming portion with a bottom surface that can create varied cross-sectional shapes, allowing one die to replace multiple specialized dies for different wheel rim configurations.
2Manufacturing precision
If multiple forming processes including ironing are used to decrease workpiece thickness, then the desired thin-walled structure is achieved, but the number of processes increases and forming time is extended
Solution Approach 1:
The patent applies preliminary action by pre-forming the workpiece into a thin-walled structure during the initial spinning forming process, before any ironing operations. The die is designed to directly create the desired thin-walled configuration in one step, eliminating the need for subsequent ironing processes that would otherwise be required to achieve the same thickness reduction.
3Reliability
If a tube material with uniform thickness is clamped and formed using conventional methods, then the workpiece can be processed, but the clamping structure becomes complex and positioning accuracy decreases
Solution Approach 1:
The patent applies spheroidality by using a mandrel with a curved surface that matches the outer peripheral surface of the tube material. This curved surface enables simple yet effective clamping and positioning of the workpiece during forming, replacing complex clamping mechanisms while maintaining high positioning accuracy through the conformal contact between the mandrel surface and tube surface.
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 shortens the forming time, simplifies the clamping process, and enables the use of a common die for various wheel rim formations by securely clamping and stabilizing the tube material, improving the true roundness and dimensional accuracy of the wheel rim.
Implementation Method 1
the first axial end portion of the tube material is squeezed between the conical concavity of the spindle-side chuck and the mandrel-side chuck of the mandrel so that the tube material is clamped
Implementation Method 2
a spinning roll for decreasing the thickness of the tube material by pressing the spinning roll against the tube material when the tube material is supported by the cylindrical portion of the mandrel
Data Source
AI summary
A spinning apparatus for decreasing by spinning a thickness of a portion of a tube material having a uniform thickness except at a first axial end portion is disclosed. The spinning apparatus includes a spindle-side chuck having a conical concavity and a mandrel. The mandrel has a mandrel-side chuck formed in a form of a conical convexity corresponding in configuration to the conical concavity of the spindle-side chuck and a cylindrical portion for supporting the tube material. The spinning apparatus further includes a spinning roll for decreasing the thickness of the tube material by pressing the spinning roll against the tube material when the tube material is supported by the cylindrical portion of the mandrel.