Bottle Can Neck Forming With Posture-Stabilizing Inner Support
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Solution Overview
Problem
Conventional methods for forming threads and emboss beads on bottle-shaped cans often result in inaccurate positioning due to the can body inclining during processing, leading to deformation and improper cap sealing, as the inner tool requires clearance for reciprocation and is not securely fixed, causing the can to move radially and axially.
Innovation Solution
A forming apparatus and method that uses an inner tool with a holding member to maintain the can body's posture by allowing radial movement while preventing axial inclination, ensuring the neck portion is accurately processed between the inner and outer tools without tilting, using a chuck member to keep the can aligned and a holding member to support radial and axial loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner tool is inserted into the can body from the bottom opening to form threads and emboss beads, then high-speed processing is achieved, but the can body inclines or tilts due to clearance requirements and lack of secure fixation
Solution Approach 1:
The can body is secured to the inner tool before processing begins. The securing operation prepares the workpiece in advance to prevent inclination during the high-speed thread and emboss bead forming operations, thereby maintaining positioning accuracy while achieving high productivity
Solution Approach 2:
The inner tool acts as an intermediary between the can body and the outer tool. By securing the can body to the inner tool, the intermediary structure enables stable high-speed processing without direct contact between the can body and external fixtures, maintaining both productivity and positioning accuracy
2Ease of operation
If clearance is maintained between the inner tool and the inner surface of the neck portion for smooth reciprocation, then the inner tool can move freely, but the can body is allowed to move radially and incline with respect to the center axis
Solution Approach 1:
The support structure is segmented into multiple support points distributed around the can body. This segmentation provides stable support that prevents radial movement and inclination while still allowing the inner tool to reciprocate freely within the required clearance
Solution Approach 2:
The support structure acts as a counterbalancing mechanism that opposes and neutralizes forces that would cause the can body to move radially or incline. By providing counteracting support forces, the system maintains can body stability while allowing necessary tool movement
3Productivity
If the forming load is concentrated on a limited site of the can body away from the gravity center to form threads and emboss beads, then the processing is efficient, but the can body inclines with respect to the inner tool and outer tool
Solution Approach 1:
The inner tool serves as an intermediary that transfers and distributes the forming load. By securing the can body to the inner tool, the load applied at the limited processing site is transmitted through the intermediary structure to the support points, preventing inclination and maintaining processing accuracy while preserving forming efficiency
Data Source
AI summary
An apparatus and a method for accurately processing a neck portion of a bottle-shaped can without changing a posture of the can. An inner tool is inserted into the neck portion from the bottom of a can body to form a stepped portion, and comprises a first forming section having a diameter smaller than an inner diameter of a neck portion. An outer tool comprises a second forming section that is opposed to the inner tool. The stepped portion is formed on the neck portion by sandwiching the neck portion by the first forming section and the second forming section. The inner tool further comprises a holding member that is situated coaxially with the can body to be contacted to an inner surface of the can body. The holding member is attached to the inner tool while being allowed to move in a radial direction together with the can body.