Metallic Hollow Member Shaping with Segmented Tool Mold
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Solution Overview
Problem
Existing methods for shaping metallic hollow members under internal pressure at increased temperatures face challenges such as unwanted expansion outside the tool, high frictional forces, and discontinuous shaping due to inductive heating, which hinder efficient material supply and result in uneven wall thickness and potential deformation or cracking.
Innovation Solution
The method involves configuring the tool mold to allow the hollow member to protrude by 30% to 60% outside, heating the tool mold accordingly, and using a neutral cavity to prevent deformation, along with inductive heating and intermittent cooling to minimize friction and ensure uniform temperature distribution for continuous shaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hollow member is placed entirely inside the shaping tool for hot working, then the shaping can be contained, but the hollow member expands undesirably outside the tool at the site of least strength and material supply is impeded
Solution Approach 1:
The shaping tool is divided into two distinct cavities: a shaping cavity where the hollow member is formed, and a neutral cavity where no shaping occurs. This segmentation allows different regions of the tool to serve different functions - the shaping cavity provides precise forming while the neutral cavity allows controlled expansion and material supply without restriction
Solution Approach 2:
The neutral cavity acts as an intermediary zone between the shaping cavity and the external environment. It provides a transition region where the hollow member can expand and receive material supply without the constraints of the shaping cavity, thereby facilitating material flow while maintaining shaping precision in the forming region
2Ease of operation
If the hollow member protrudes from the tool mold for material supply, then material can be fed more easily, but the hollow member cannot be prevented from expanding outside the tool
Solution Approach 1:
The tool mold is segmented into a shaping cavity that maintains shape control and a neutral cavity that permits expansion. The hollow member protrudes into the neutral cavity where expansion occurs without affecting the precision of the shaping cavity region
Solution Approach 2:
Different regions of the tool have different functional qualities: the shaping cavity region maintains high constraint for precision shaping, while the neutral cavity region provides freedom for expansion and material supply. This local differentiation of constraints allows simultaneous achievement of shape control and material supply
3Temperature
If the hollow member is inductively heated, then the workpiece can be heated without heating the tool, but the workpiece freezes when contacting the cold tool wall and shaping becomes discontinuous
Solution Approach 1:
The tool cavity is pre-heated to the shaping temperature before the hollow member is inserted. This preliminary heating of the tool ensures that when the workpiece contacts the tool wall, no freezing occurs, allowing continuous shaping without interruptions for reheating
Solution Approach 2:
The heating method is replaced from inductive heating of the workpiece to thermal conduction heating of the tool cavity. By heating the tool cavity itself, the system eliminates the temperature mismatch between workpiece and tool, thereby enabling continuous shaping operations
4Productivity
If the tool is heated to maintain continuous shaping, then shaping can proceed without freezing, but the hollow member outside the tool expands undesirably
Solution Approach 1:
The tool is heated only in the shaping cavity region to the shaping temperature, while the neutral cavity remains at a lower temperature. This localized heating maintains shaping continuity in the forming region without causing excessive expansion in the neutral cavity region where the hollow member protrudes
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 approach prevents deformation outside the tool, reduces frictional losses, allows continuous shaping, and achieves uniform wall thickness by maintaining the highest temperature in regions requiring the most material, ensuring efficient material supply and preventing buckling, thus enabling the production of hollow members with consistent properties.
Implementation Method 1
the workpiece is heated inductively
Implementation Method 2
the hollow member is given its shape... under internal pressure... at increased temperature
Data Source
AI summary
The subject matter of the present invention is a method of shaping a metallic hollow member in a shaping tool (1, 20, 50) at increased temperature and under internal pressure, said hollow member (5) protruding at one end at least from said shaping tool (1), the configuration of the tool mold and/or the shaping parameters acting onto said hollow member being selected in such a manner that said hollow member (5, 59) substantially keeps its original shape outside said tool (1, 20, 50), with said tool being heated in the region of the cavity and a tool, said tool being completely made from a homogeneous ceramic material with the component part being heated inductively, the cavity having a tribological additional coating in order to minimize friction of the component part against the wall and/or the affinity of the component part with the material of the cavity wall.