Titanium Alloy Stringer Hot Forming With Die Heating and Axial Force
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Solution Overview
Problem
Existing high-temperature forming methods for titanium alloy stringers with regular cross-sections face challenges in achieving high precision and microstructure properties, leading to issues such as springback, surface oxidation, and reduced production efficiency.
Innovation Solution
A forming device and method that utilize a temperature control die assembly, axial force control, and self-resistance heating to achieve high-precision hot forming of titanium alloy parts. This involves heating the dies and the part to specific temperatures, applying axial forces to control internal stress, and combining hot stamping with die quenching and stress relaxation in a single process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If superplastic forming method is used, then formability is improved, but manufacturing precision deteriorates due to significant local thinning and performance weakening
Solution Approach 1:
The patent applies parameter changes by controlling temperature and strain rate during forming. Specifically, it uses isothermal compression forming where the sheet and dies are heated to the same temperature (e.g., 700-900°C for titanium alloy) to improve formability while maintaining dimensional precision through controlled thermal parameters and deformation conditions.
Solution Approach 2:
The patent utilizes phase transitions by heating the titanium alloy sheet to austenite phase region before forming, then rapidly cooling it during die quenching to achieve martensite transformation. This phase transition enables both high formability during heating and high dimensional precision after quenching, while also improving strength.
2Ease of manufacture
If isothermal compression forming method is used, then formability is improved, but production efficiency deteriorates due to long heating and forming time
Solution Approach 1:
The patent merges multiple processes into a single integrated operation. It combines isothermal compression forming with die quenching and stress relaxation in one continuous process, eliminating separate heating, forming, and cooling steps. This integration maintains formability while significantly improving production efficiency by reducing total process time.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining isothermal conditions throughout the forming process and immediately transitioning to quenching without intermediate cooling or reheating steps. The continuous thermal and mechanical action eliminates idle time between operations, improving production efficiency while preserving formability.
3Ease of manufacture
If isothermal compression forming method is used, then formability is improved, but energy consumption increases due to high forming temperature and long heating time
Solution Approach 1:
The patent applies preliminary action by pre-heating both the sheet and dies to the same temperature before forming begins. This preliminary thermal preparation ensures that no additional heating energy is required during the actual forming process, reducing overall energy consumption while maintaining the high temperatures needed for improved formability.
Solution Approach 2:
The patent rushes through the high-temperature holding stage by immediately transitioning from isothermal forming to rapid die quenching, minimizing the time the material spends at high temperature. This reduces energy consumption associated with maintaining high temperatures while still achieving the necessary formability improvements.
4Productivity
If cold die hot stamping method is used, then production efficiency is improved, but manufacturing precision deteriorates due to heat loss during sheet transferring and stamping
Solution Approach 1:
The patent creates an inert thermal environment by heating the dies to the same temperature as the sheet before forming, eliminating temperature gradients and heat flow during the process. This thermal inert environment prevents heat loss and temperature inconsistency, maintaining manufacturing precision while allowing efficient single-step forming.
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 enables high-precision forming of titanium alloy parts with improved formability and production efficiency, reduced springback, and enhanced dimensional precision and strength, effectively addressing the limitations of existing methods.
Implementation Method 1
utilize a temperature control die assembly, axial force control, and self-resistance heating to achieve high-precision hot forming
Implementation Method 2
a first die heating assembly being arranged on the first stamping die and a second die heating assembly being arranged on the second stamping die
Implementation Method 3
an axial force control assembly configured for applying an axial force to the part to be formed to adjust an internal stress of the part to be formed
Implementation Method 4
a closing driving assembly connected with at least one of the first stamping die and the second stamping die and configured for driving the first stamping die and the second stamping die to close so as to stamp a part to be formed
Data Source
AI summary
A forming device and a forming method for a part with a regular cross-section are provided, and relates to the technical field of metal member forming and manufacturing. A part to be formed is heated by a part heating temperature control assembly to obtain required microstructure evolution, so that the forming performance is improved. A temperature control die assembly can be heated by setting die heating assemblies, so that hot stamping, die quenching and stress relaxation can be carried out. The internal stress state of the part is controlled by an axial force control assembly.