Method and device for determining the similarity of parallel manufacturing machines

The method uses histograms and vector angles to assess the similarity of parallel manufacturing machines, addressing the unreliability of existing methods and enabling efficient troubleshooting of yield issues in manufacturing processes.

WO2026153949A1PCT designated stage Publication Date: 2026-07-23ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2026-01-14
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing methods for determining the similarity of parallel manufacturing machines are unreliable and computationally intensive, failing to provide practical insights into the actual similarity of process results, and cannot effectively diagnose yield problems in manufacturing processes.

Method used

A method using histograms to compare the distribution of measured values from parallel manufacturing machines, calculating the angle between vectors derived from these histograms to determine similarity, and identifying the production machine with the most probable process deviation by tracing batches with low yield.

Benefits of technology

Provides a reliable and automatable diagnosis of yield problems by accurately assessing the similarity of manufacturing processes, enabling rapid identification of deviations and optimizing production settings.

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Abstract

The present invention relates to a computer-implemented method (100) for determining a similarity of parallel similar manufacturing machines (321, 322, 323, 331, 322, 323) of a manufacturing stage (320, 330) in the production of a mass product, comprising the following steps: - determining (110) in each case a plurality of measured values of a characteristic physical variable for the parallel similar manufacturing machines (321, 322, 323, 331, 322, 323) by carrying out measurements on a plurality of intermediate products or end products of the production, the characteristic physical variable being a property of the mass product that is significantly influenced by the manufacturing machine (321, 322, 323, 331, 322, 323); - providing (120) in each case a histogram on the basis of the plurality of measured values of the physical variable for each of the parallel manufacturing machines (321, 322, 323, 331, 322, 323), the histograms (210) in particular comprising similarly defined classes (211), each of which is assigned a frequency (212) corresponding to the number of measured values which can be assigned to the class (211); - determining (130) the similarity between in each case two of the parallel similar manufacturing machines (321, 322, 323, 331, 322, 323) depending on a corresponding angle between vectors (220) derived from the histograms (210), a vector (220) being formed by the frequencies assigned to the defined classes (211) for one of the parallel similar manufacturing machines (321, 322, 323, 331, 322, 323).
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