Segmented Die Shoe Assembly for Thermal Expansion in Shell Presses
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Solution Overview
Problem
High-speed shell press operations generate excessive heat, leading to thermal expansion of die shoes, which causes tooling misalignment, reduced clearances, and manufacturing defects in can ends, necessitating costly cooling solutions.
Innovation Solution
A die assembly with a first die shoe divided into separate pieces to accommodate thermal expansion, featuring a stepped profile and guide assemblies for alignment, eliminating the need for cooling systems by spacing pieces apart to reduce heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shell press operates at high speed to increase productivity, then productivity is improved, but thermal expansion of die shoes occurs leading to tooling misalignment and manufacturing defects
Solution Approach 1:
The die shoe is divided into multiple separate segments rather than being a single monolithic piece. Each segment can independently expand or contract in response to thermal changes, preventing the cumulative thermal expansion that occurs in solid die shoes. This segmentation allows the press to maintain manufacturing precision even during high-speed operation when thermal effects are significant.
2Manufacturing precision
If coolant systems are added to reduce thermal expansion, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The segmented die shoe structure is self-regulating and requires no external cooling systems or active control mechanisms. The segments naturally accommodate thermal expansion through their ability to move independently relative to each other, eliminating the need for complex coolant delivery systems, temperature sensors, and control algorithms that would otherwise be required to maintain precision.
3Strength
If die shoes are made as single solid pieces for structural strength, then strength is improved, but thermal expansion causes tooling wear and damage
Solution Approach 1:
The die shoe is divided into multiple segments that are joined together, providing both the structural strength needed for high-speed pressing and the thermal flexibility to accommodate expansion. The segmented design allows stress distribution across multiple joints rather than concentrating thermal stress in a single solid structure, reducing the risk of cracking and catastrophic failure.
Solution Approach 2:
The die shoe transitions from a static, rigid structure to a dynamic assembly where segments can move relative to each other in response to thermal conditions. This dynamic capability allows the die shoe to adapt to changing thermal environments during operation, maintaining reliability by preventing the buildup of excessive thermal stresses that would lead to tooling damage.
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 reduces thermal expansion, maintains tooling alignment, and ensures consistent production of shells within specifications, eliminating the requirement for costly cooling systems and maintaining high-speed operation.
Implementation Method 1
a first die shoe (52) comprising a first end (56), a second end (58) disposed opposite and distal from the first end (56), and a number of divisions (64, 66) between the first end (56) and the second end (58) to divide the first die shoe (52) into a plurality of pieces to accommodate thermal expansion
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A die assembly is provided, which is structured to be affixed to a shell press. The die assembly includes at least one die shoe having first and second opposing ends, and a number of divisions between the first end and the second end. The divisions are structured to divide the at least one die shoe into a plurality of pieces to accommodate thermal expansion. Each of the divisions between the pieces of the at least one die shoe has a profile. Preferably, the profile is not straight. Each of the divisions of the at least one die shoe form a gap between the pieces of the die shoe, thereby spacing the pieces apart from one another. The pieces are independently coupled to a corresponding mounting surface of the shell press. A shell press and a method for employing the die assembly in a shell press are also disclosed.