Necking-In Roller Forms Inward Collar in Pipe Base
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Solution Overview
Problem
Existing methods for producing containers with inward-projecting collars are inefficient in forming a base with an inward-projecting collar while maintaining the overall height and width, and do not effectively utilize the material for enhanced storage capacity.
Innovation Solution
A method involving a pipe section as the basic workpiece, where a forming roller is used to neck-in the pipe section, creating an inward-projecting material thickening and introducing an opening to form a ring-shaped collar, with the forming roller moving along progressively decreasing curved paths to achieve a closed base and selectively thicken the material for the collar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an outward-projecting collar is formed using a spinning method with a spinning roller fed along an arched path, then the collar can be produced, but the overall height and width of the container are increased
Solution Approach 1:
The patent inverts the conventional approach by forming an inward-projecting collar instead of an outward-projecting collar. The necking-in roller reduces the diameter of the pipe section, causing material to flow inward and form a collar that projects into the container interior rather than outward, thereby maintaining external dimensions while preserving internal storage capacity.
Solution Approach 2:
The patent changes the fundamental parameter of collar projection direction from outward to inward. By using a necking-in process instead of a spinning process, the material flow is redirected inward, creating a collar that enhances storage capacity by not increasing the external footprint of the container.
2Shape
If a forming tool is advanced axially to generate pressure for material flow, then an inverted collar can be formed, but the process requires complex tool movements and multiple steps
Solution Approach 1:
The necking-in roller serves multiple functions: it reduces the pipe section diameter, generates the necessary pressure for material flow, and forms the inward-projecting collar in a single integrated tool. This eliminates the need for complex coordinated movements between multiple forming tools and simplifies the overall process.
Solution Approach 2:
The patent combines the diameter reduction function and the collar forming function into a single necking-in operation. The necking-in roller simultaneously performs both functions that would otherwise require separate tooling and process steps, thereby reducing device complexity.
3Strength
If the base wall thickness is increased in the collar area, then the collar can be formed, but the material distribution becomes non-uniform
Solution Approach 1:
The necking-in process creates local material thickening precisely where needed - in the collar area of the base. The forming process is localized to the region where the collar is required, allowing non-uniform wall thickness distribution that is optimal for collar formation while maintaining uniformity in other areas of the container.
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
This method efficiently produces a container base with an inward-projecting collar, enhancing storage capacity while maintaining structural integrity and allowing for precise control over the wall thickness profile, resulting in a gas-tight and efficiently formed container.
Implementation Method 1
a pipe section is necked in, i.e. the diameter of the pipe section is reduced by means of a forming roller... an inward-projecting material thickening is formed
Data Source
AI summary
The invention relates to a process for forming a pipe portion, in which process a base having an opening and having an inwardly projecting collar is formed. It is provided that the pipe portion is made to rotate, that the pipe portion is drawn in by means of a forming roller, with the base being formed by the drawing-in process, that an inwardly projecting material thickening is formed integrally in the base and that an opening is made in the base in the region of the inwardly projecting material thickening, wherein the inwardly projecting collar is formed by at least part of the inwardly projecting material thickening. Furthermore, the invention relates to an apparatus for forming a workpiece.