Flow Forming Device with Integrated Cutting Tool
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Solution Overview
Problem
Existing flow-forming methods face challenges in processing workpieces with irregular wall thickness in the circumferential direction, leading to the 'whip arm effect' where the workpiece warps and the forming process is aborted due to uneven material distribution and increased length in areas of greater wall thickness.
Innovation Solution
A device and method that incorporate a cutting tool to machine the workpiece during forming, allowing for greater irregularities in wall thickness by ensuring even material distribution through the use of an outer forming tool, such as a forming roller, and an inner mandrel, which helps absorb reaction forces and maintain the workpiece's position relative to the forming tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If flow-forming method is used to reshape hollow body, then diameter and wall thickness are reduced, but wall thickness uniformity deteriorates leading to whip arm effect
Solution Approach 1:
The cutting tool performs preliminary removal of material in regions with excessive wall thickness before the forming process completes. By pre-removing material that would otherwise cause uneven distribution, the cutting tool prevents the whip arm effect from developing during forming, allowing workpieces with initially irregular wall thickness to be successfully formed.
Solution Approach 2:
The cutting tool applies localized material removal only in specific circumferential regions where wall thickness exceeds the target value. This selective intervention maintains material in regions that already have appropriate thickness while removing excess material only where needed, preserving overall workpiece integrity while achieving uniform wall thickness distribution.
2Adaptability or versatility
If additional forming tools are added to device, then forming capability is improved, but device complexity increases
Solution Approach 1:
The cutting tool is integrated into the existing forming device structure, combining material removal and plastic deformation functions in a single coordinated system. The cutting tool shares the rotating frame and drive mechanism with the forming tools, eliminating the need for separate standalone machining equipment while expanding the device's processing capabilities.
Solution Approach 2:
The multi-functional device performs both plastic deformation (forming) and material removal (cutting) operations using a single integrated system. The rotating frame supports both forming tools and cutting tools, allowing the device to handle workpieces with varying wall thickness irregularities that would require different processing approaches.
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 solution effectively prevents the whip arm effect by ensuring even material distribution and absorption of reaction forces, enabling the processing of workpieces with more significant wall thickness irregularities, thus stabilizing the forming process and preventing warping.
Implementation Method 1
Through plastic deformation, the material of the workpiece is initially displaced by the outer forming tools towards the inner forming tool
Implementation Method 2
a cutting tool of the device can act on the outer contour of the workpiece at the same time as the forming tool
Data Source
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AI summary
A device (1) for forming a hollow and at least substantially rotationally symmetrical workpiece (4) comprises an inner forming tool (3) for supporting an inner contour of the workpiece (4) and an outer forming tool (2) for introducing a forming force into an outer contour (10) of the workpiece (4). The workpiece (4) is rotatable about an axis of rotation (X) relative to the outer forming tool (2). The device (1) includes a cutting tool (15) and is designed such that the cutting tool (15) can engage the outer contour (10) of the workpiece (4) simultaneously with the forming tool (2).