Forged Part Identification Across Heat Treatment and Machining
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Solution Overview
Problem
The challenge of achieving continuous traceability of forged parts throughout the manufacturing process, from forging to mechanical processing, is hindered by high thermal stress, surface scaling, contaminants, and mechanical stress, which prevent consistent marking and optical tracking, especially during and after the forging process.
Innovation Solution
A method involving mechanical indentation to create a first identifier on the workpiece during forging, followed by additional identifiers using laser or printing in subsequent steps, combined with process parameter recording and storage in a database, ensuring traceability despite environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous marking of workpieces is implemented throughout the manufacturing process, then traceability is improved, but the mechanical properties and surface quality of the forged parts deteriorate due to notch effects, corrosion resistance loss, and surface damage
Solution Approach 1:
The marking process is segmented into two distinct phases: first marking during/after forging when the workpiece is hot and malleable, and second marking after heat treatment when the workpiece is cooler. This segmentation allows marking to be performed at optimal times without compromising mechanical properties at critical stages.
Solution Approach 2:
The first marking is performed preliminarily during or immediately after the forging process when the workpiece temperature is still high (above Ac3 transformation point). This preliminary marking takes advantage of the hot, soft state of the metal to create marks without causing notch effects or surface damage that would occur if marking were done after cooling and heat treatment.
2Reliability
If marking is performed during or immediately after forging, then traceability is established early, but the high thermal stress and surface scaling prevent direct access to the workpiece surface
Solution Approach 1:
The marking process exploits the temperature parameter change of the workpiece. During and immediately after forging, the workpiece is at high temperature which makes the metal softer and more malleable, allowing easy marking. The marking is performed while the workpiece is still hot, and the high temperature facilitates the marking process rather than hindering it.
3Productivity
If workpieces are temporarily stored between process steps and processed in parallel, then production efficiency is improved, but continuous optical tracking becomes impossible
Solution Approach 1:
Instead of relying on continuous optical tracking of physical workpieces through storage and parallel processing, the system creates a digital copy of the traceability information in a database. The first marking establishes the initial traceability data, which is then stored and can be retrieved later, effectively copying the tracking information rather than maintaining continuous physical observation.
4Ease of manufacture
If surface marking methods are used on hot forged workpieces, then marking is achieved, but the brittle scale layer and contaminants interfere with marking accuracy and readability
Solution Approach 1:
Instead of trying to mark on top of the scale layer or through contaminants, the method inverts the approach by marking the workpiece when the scale layer is still present and the surface conditions are less critical. The first marking is done on the hot workpiece where the scale and contaminants do not prevent marking, and the marks are created in a way that remains readable despite the surface conditions.
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
Ensures consistent and durable traceability of forged parts through the manufacturing process, maintaining mechanical integrity and readability of identifiers, allowing retrieval of process parameters and quality data for quality control and defect identification.
Implementation Method 1
the workpiece produced by the forging process is marked with an initial marking by means of a mechanical indentation method
Implementation Method 2
the workpiece produced in this step is subsequently marked with a further identifier, generated using a laser or a printing process
Data Source
Figure 1
AI summary
The invention relates to a method for tracing forged parts over the entire production process, in particular from the forging process, via sandblasting and heat treatment, to mechanical processing, the method comprising the following steps: detecting process parameters of the forging process; marking the workpiece produced in the forging process with a first identifier by means of a mechanical or thermal penetrant method; storing the detected process parameters of the forging process together with the first identifier of the produced workpiece in a database; reading the identifier of the workpiece produced in the previous process step; detecting process parameters during subsequent process steps of the production process; storing the process parameters of the subsequent process steps in the database for the read identifier, if the legibility of the first identifier of the workpiece remains during the subsequent process step of the production process; marking the workpiece produced in the subsequent process step with a further identifier by means of a surface inscription method, if the legibility of the first identifier of the workpiece does not remain during the subsequent process step of the production process; and storing the process parameters of the subsequent process step together with the further identifier together with the process parameters of the previous process steps and the first identifier in the database.