Pressing Die Structure for Pressure-Resistant Easy Open Ends

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Solution Overview

Problem

Existing pressing dies for uncurled shells of pressure-resistant easy open ends face issues with reliability and service life due to complex design, wear on action surfaces, thinning of uncurled shell components, and flange cracking, particularly in forming the ferrule arc portion and upward extension.

Innovation Solution

A pressing die design comprising a lower die with a lower die core ring and upper die with inner and outer forming rings, utilizing separate air chambers for independent pressure control, and a simplified structure to form the uncurled shell's sealing, countersink, and ferrule arc portions, with improved contour matching and suspension mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a complex pressing die structure with pneumatic routes is used to form pressure-resistant easy open ends, then the pressure bearing capacity of the uncurled shell is improved, but the production difficulty and cost increase

Engineering Contradiction:

Improvepressure bearing capacityVSAvoidpressing die structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The pressing die is divided into multiple functional components: a lower die with a lower die core ring, an upper die with upper and lower pressing rings, and separate air chambers. Each component has a specific function in forming different portions of the uncurled shell, allowing complex shaping without requiring a monolithic complex die structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Air chambers are used to apply controlled pressure to the metal sheet during forming. The lower air chamber applies pressure from below to support the lower pressing ring, while the upper air chamber applies pressure from above to the upper pressing ring, enabling precise control of the forming process for pressure-resistant structures.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Productivity

If the upper pressing ring action surface is used repeatedly for stretching forming, then production efficiency is maintained, but the action surface becomes worn and the uncurled shell portion becomes thinned

Engineering Contradiction:

Improveproduction efficiencyVSAvoidservice life of pressing die

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The upper pressing ring is designed as a replaceable component. When its action surface becomes worn, the entire upper pressing ring can be replaced rather than attempting to repair or recondition it, ensuring consistent forming quality and preventing defects in the uncurled shell.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The upper pressing ring is pre-formed with the correct geometry and surface finish required for high-quality forming. This pre-prepared component ensures that the first contact with the metal sheet produces optimal results, and replacement rings maintain this quality throughout their service life.

Inventive Principle:

Principle #10Preliminary action

3Shape

If the flange of the upper die core body is used for forming the ferrule arc portion, then the ferrule structure is created, but the flange becomes prone to cracking

Engineering Contradiction:

Improveferrule arc portion formationVSAvoidservice life of upper die core body

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The upper die core body is segmented into a main body and a separate flange portion. The flange, which is subjected to high stress during ferrule forming, can be designed with appropriate thickness and geometry to distribute stresses, or replaced independently if damage occurs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flange is designed with increased thickness and reinforced geometry before use to cushion and distribute the high stresses encountered during ferrule arc portion formation. This pre-reinforcement prevents cracking by reducing stress concentration at critical locations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Ease of manufacture

If a simplified pressing die structure is used, then manufacturing ease is improved, but the ability to form complex pressure-resistant structures may be compromised

Engineering Contradiction:

Improvepressing die manufacturing easeVSAvoidpressure resistance of uncurled shell

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The pressing die is segmented into standardized components (lower die core ring, upper die core body, pressing rings) that can be manufactured using conventional machining processes. Each component is relatively simple in shape, facilitating ease of manufacture, yet their coordinated arrangement enables formation of complex pressure-resistant uncurled shell structures.

Inventive Principle:

Principle #1Segmentation

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

Enhances the reliability and service life of the pressing die by reducing surface wear, preventing thinning, and increasing the pressure resistance of the uncurled shell, while simplifying the air chamber structure and improving manufacturing ease.

Implementation Method 1

a first air chamber is sealed and formed under the lower die core in the lower die core ring, and the air pressure of the first air chamber is used to support the lower die core

Methodology Applied