Sintered Part Calibration With Simultaneous Axial and Radial Compression
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Solution Overview
Problem
Existing methods for producing sintered parts are inefficient, costly, and struggle to achieve high dimensional accuracy and density with complex structures, often leading to cracking due to high stress gradients when calibrating and rolling processes are conducted sequentially.
Innovation Solution
A method involving simultaneous application of compressive forces in both axial and radial directions during the calibration and rolling processes, using a tool with integrated punching and rolling units to shape and compact the sintered part, reducing stress gradients and allowing for parallel processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If calibration and rolling processes are conducted sequentially in separate tools, then each process can be performed with dedicated equipment, but processing time increases and productivity decreases
Solution Approach 1:
The patent combines calibration and rolling processes into a single integrated tool that can perform both operations simultaneously or sequentially on the sintered part. The tool includes both calibration elements and rolling elements, eliminating the need to transfer the workpiece between separate tools and reducing total processing time.
Solution Approach 2:
The integrated tool enables continuous processing where calibration and rolling operations can be performed in an uninterrupted sequence within the same tooling setup. The sintered part remains in the tool throughout both operations, maintaining continuous productive action without idle transfer time.
2Manufacturing precision
If high compressive forces are applied during calibration to achieve high density, then dimensional accuracy improves, but stress gradients increase causing cracking
Solution Approach 1:
The calibration process is segmented into multiple stages with progressively increasing compressive forces. The integrated tool applies force in controlled increments through its calibration elements, allowing the material to densify gradually without creating excessive stress gradients that would cause cracking.
Solution Approach 2:
The calibration and rolling operations are performed in periodic cycles within the integrated tool. Between calibration strokes, rolling operations relieve built-up stress gradients, creating a periodic action pattern that achieves high density while preventing crack formation through intermittent stress relief.
3Ease of manufacture
If multiple separate tools are used for calibration and rolling, then each tool can be optimized for its specific function, but device complexity and setup time increase
Solution Approach 1:
The tool is designed with multi-functionality, incorporating both calibration elements and rolling elements within a single device. This universal tool can perform multiple operations on the sintered part without requiring tool changes or setup modifications, reducing device complexity while maintaining functional optimization for each process.
4Ease of operation
If sequential processing in separate tools is used, then process control is simpler for each individual operation, but the need for multiple tool changes and re-clamping increases operational complexity
Solution Approach 1:
By merging calibration and rolling operations into one integrated tool, the patent eliminates the need for tool changes and re-clamping operations. The workpiece remains secured in the same tool throughout both processes, simplifying operational procedures while maintaining separate control capabilities for each function through the tool's independent control systems.
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 significantly reduces processing time, minimizes cracking, and enhances dimensional accuracy and density, enabling the production of complex structures with high reproducibility and precision, while reducing the need for multiple tool changes and clamping.
Implementation Method 1
subjecting the sintered part to a first compressive force acting on the end faces at least in an axial direction and subjecting the sintered part to a second compressive force acting on the peripheral surface at least in a radial direction
Data Source
AI summary
A method for producing a sintered part, having at least the following steps: a) providing a sintered part, said sintered part having a first end face, a second end face arranged at a distance from the first end face in an axial direction, and a circumferential surface between the end faces; b) arranging the sintered part in a tool; c) applying a first pressure force, which acts on the end faces at least in the axial direction, to the sintered part by means of the tool; and d) applying a second pressure force, which acts on the circumferential surface at least in a radial direction, to the sintered part, wherein the sintered part is reshaped at least by the second pressure force, or mechanically processing the sintered part. Steps c) and d) are carried out at least partly simultaneously.