Cylindrical Member Bending Die for Linear Edge Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for bending the open end portion of a cylindrical workpiece to the inner circumferential side require multiple steps and are complicated, and cannot form a linear shape when required by the specification of the cylindrical member.
Innovation Solution
A method involving a die with a recessed processing surface on an upper die that includes a first portion guiding the end portion to the inner circumferential side and a second portion clamping it with a lower die, allowing the end portion to be bent in a single axial direction, with the second portion having a linear shape to form a linear shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If three-step curling processing is used to bend the open end portion to the inner circumferential side, then the bending function is achieved, but the processing becomes complicated and cannot form a linear shape
Solution Approach 1:
The processing surface of the upper die is segmented into two distinct portions: a first portion with a curved surface that guides the end portion to the inner circumferential side, and a second portion with a linear shape that clamps the end portion. This segmentation allows a single-step process to achieve both the bending function and linear shape formation, eliminating the need for multiple processing steps while maintaining the desired geometric outcomes
Solution Approach 2:
The invention merges the guiding function and clamping function into a single upper die structure with an integrated processing surface. The first portion provides guiding action while the second portion provides clamping action, both occurring simultaneously in one bending step. This consolidation of functions into a single tool and single step directly resolves the contradiction between achieving bending functionality and maintaining process simplicity
2Reliability
If three-step curling processing is used, then the end portion is bent to the inner circumferential side, but the driving direction of the tool changes for each step making processing complicated
Solution Approach 1:
The processing surface is divided into functional segments (first portion for guiding, second portion for clamping) that work together in a single tool. This segmentation enables the tool to perform multiple functions (guiding and clamping) in one operation with a single driving direction, eliminating the need to change tool driving directions between steps while maintaining reliable bending functionality
Solution Approach 2:
The guiding function and clamping function are merged into a single upper die structure that operates in one step with one driving direction. The curved first portion and linear second portion work simultaneously during the bending operation, combining multiple functions into a unified tool action that maintains operational simplicity and reliability
3Shape
If conventional curling processing is used, then the open end portion is formed into a curled shape, but a linear shape cannot be formed when required by specification
Solution Approach 1:
Different portions of the processing surface are given different geometric qualities: the first portion has a curved surface quality that produces the desired curved guidance path, while the second portion has a linear shape quality that produces the required linear clamping action. This local differentiation of surface qualities within the same tool enables the formation of linear shapes while maintaining the capability for curved guidance, providing adaptability to different shape specifications
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 simplifies the bending process and enables the formation of a linear shape in the bent end portion, reducing complexity and suppressing buckling and shaping failures.
Implementation Method 1
bending an end portion of the workpiece in an axial direction of the workpiece to an inner circumferential side of the workpiece using a lower die that is disposed in the workpiece and an upper die that undergoes relative movement toward the workpiece along the axial direction
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A method for manufacturing a cylindrical member (10) includes a preparation step of preparing a workpiece (20) and a bending processing step of bending an end portion (23) of the workpiece (20) to an inner circumferential side using a lower die (40) and an upper die (30). A recessed processing surface (31) of the upper die (30) includes a first portion (311) and a second portion (312). The first portion (311) extends toward a side opposite to the workpiece (20) in the axial direction and toward the inner circumferential side of the workpiece (20). The second portion (312) has a linear shape and extends from the first portion (311) to the inner circumferential side of the workpiece (20). In the bending processing step, the first portion (311) guides the end portion (23) to the inner circumferential side of the workpiece (20), and the second portion (312) clamps the end portion (23) together with the lower die (40).