Hot Stamp Tooling Assembly for Localized Annealing Control
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Solution Overview
Problem
Existing methods struggle to accurately heat treat localized areas of metal parts without excess heat creeping into nearby portions, resulting in large transition zones between tempered and non-tempered locations, making it difficult to produce parts with tailored temper properties.
Innovation Solution
A hot stamp tool assembly with separate hot forming and annealing dies, utilizing transfer arms to move blanks and shaped parts between these dies, where hot forming dies quench and shape parts with martensite, and annealing dies anneal and cool parts with induction coils, minimizing heat transfer and reducing transition zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If localized areas of a part are heat treated to change physical characteristics, then strength and ductility are improved in specific areas, but excess heat creeps into nearby portions creating large transition zones
Solution Approach 1:
The die is divided into separate heated and non-heated zones, allowing localized heat treatment of specific areas without affecting adjacent regions. This segmentation enables precise control over which portions receive heat treatment, minimizing unwanted heat creep and reducing transition zone sizes.
Solution Approach 2:
Different zones of the die are assigned different thermal properties - some areas are heated to modify metal characteristics while other areas remain unheated. This local differentiation allows tailored temper properties in specific regions while maintaining original properties in adjacent areas, creating sharp transitions with minimal overlap zones.
2Strength
If the die is heated to high temperatures to change metal physical characteristics, then tempered parts achieve optimized strength and ductility, but the parts become too hard to shape and connect
Solution Approach 1:
Only specific localized areas of the part are heated to high temperatures to achieve optimized strength and ductility, while other areas remain at lower temperatures maintaining softer, more workable characteristics. This allows the part to have both hard, strong regions for structural integrity and softer regions for shaping and connection operations.
Solution Approach 2:
The heat treatment process is segmented into distinct heated and non-heated zones, creating a part with heterogeneous properties - some areas are tempered to high strength while other areas retain lower strength and higher ductility, enabling both structural performance and manufacturability in different regions.
3Weight of moving object
If thinner gauges are used to reduce weight, then fuel efficiency is improved, but parts become difficult to shape and connect
Solution Approach 1:
Thinner gauge parts are used throughout to reduce weight, but localized heat treatment is applied to specific areas to modify properties where needed. The heated zones achieve optimized strength and ductility for structural requirements, while unheated zones remain softer and more formable, enabling both weight reduction and manufacturability.
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 assembly effectively forms parts with tailored temper properties and small transition zones, enhancing the ability to produce parts with localized areas of varying strength and ductility, improving workability and reducing weight.
Implementation Method 1
annealing dies anneal and cool parts with induction coils, minimizing heat transfer
Implementation Method 2
hot forming dies quench and shape parts with martensite
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A hot stamp tool including an annealing die and a hot forming die. A blank is placed in the hot forming die with a first transfer arm where it is formed and quenched into a shaped part. The shaped part is then moved from the hot forming die to the annealing die with a second transfer arm. In the annealing die, the shaped part continues to be cooled. The annealing die includes a heating element that heats a portion of the shaped part to the point of annealing to form an annealed part. The annealed part includes a non-annealed portion and an annealed portion with a transition zone between the annealed portion and the non-annealed portion. The annealed portion can then be deformed.