Thread Plug Gauge Sliding Clutch for In-Process Quality Testing
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Solution Overview
Problem
Existing methods for testing threads are inefficient and costly, often requiring separate machines and complex positioning of thread plug gauges, with unclear criteria for judging thread quality, and are typically performed downstream from the machining process.
Innovation Solution
An apparatus with a thread plug gauge and sliding clutch integrated into a machine tool's spindle allows for in-process thread testing, using existing machine signals for quality evaluation by comparing screwing-in signals against a reference curve, eliminating the need for additional machines and complex positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thread testing is performed using separate downstream measurement systems, then thread quality can be measured, but device complexity and costs increase due to additional machines and complex positioning requirements
Solution Approach 1:
The patent combines the thread testing function with the existing machine tool spindle by integrating a thread plug gauge and evaluation device into the spindle structure. This allows the same spindle used for machining to also perform thread testing, eliminating the need for separate downstream measurement systems and complex positioning mechanisms.
Solution Approach 2:
The machine tool spindle is designed to perform multiple functions: both machining operations and thread quality testing. By making the spindle universal, the patent eliminates the need for dedicated testing equipment and reduces overall system complexity while maintaining measurement capability.
2Adaptability or versatility
If a double-sided motor spindle is used for thread testing, then thread testing can be performed in the same machine tool, but constructive efforts and costs increase significantly
Solution Approach 1:
The patent divides the spindle into functional segments: the existing motor spindle for machining, and a separate testing apparatus with its own drive mechanism (such as a belt drive or gear mechanism) that can be engaged when thread testing is required. This segmentation allows in-process testing without requiring a complex double-sided motor spindle.
Solution Approach 2:
The testing apparatus is designed to be dynamically engaged or disengaged from the spindle as needed. The drive mechanism can be activated only during thread testing operations, allowing the spindle to switch between machining and testing functions without requiring permanent dual-sided motor configuration.
3Measurement precision
If thread testing is performed downstream from machining, then quality measurement is possible, but productivity decreases due to separate processing steps
Solution Approach 1:
By merging the thread testing function into the machining process itself using the same spindle, the patent eliminates the need for separate downstream testing operations. Workpieces can be tested immediately after threading without transfer to separate measurement equipment, thereby improving productivity while maintaining quality assessment capability.
Solution Approach 2:
The integrated testing system allows continuous operation where machining and testing are performed in sequence without interruption or workpiece handling. The spindle continues to rotate and engage the workpiece for testing immediately after threading, maintaining continuous useful action and eliminating idle time associated with separate testing operations.
4Reliability
If clear criteria for thread quality judgment are established, then reliable quality assessment is achieved, but determination methods become complex
Solution Approach 1:
The patent implements an automated evaluation device that receives signals from sensors monitoring thread plug gauge insertion and provides feedback on thread quality. The system compares measured parameters against predetermined criteria and automatically determines pass/fail status, providing reliable quality assessment while simplifying the judgment process through automated decision logic.
Solution Approach 2:
The patent replaces manual thread quality assessment with an automated electronic evaluation system. Instead of relying on operator interpretation of mechanical gauge insertion, sensors and evaluation electronics automatically measure and assess thread quality parameters, increasing reliability while managing complexity through standardized electronic measurement and comparison algorithms.
Data Source
AI summary
The invention relates to an apparatus (10) for testing threads comprising a thread plug gauge (11) which can be screwed into a thread (2) tapped by a machine tool, and a connecting member (14) with which the apparatus (10) can be exchangeably arranged at a tool spindle (20) of the tool machine, and wherein a sliding clutch (12) is arranged between the thread plug gauge (11) and the connecting member (14). The invention relates furthermore to a method in which signals (100) from one or more signals transmitters which are related to screwing-in the thread plug gauge are acquired, in which a reference curve (210) of signals related to screwing the thread plug gauge into a reference thread is stored, and in which the reference curve (210) and/or a curve or magnitude derived therefrom is compared with the signals (100) and/or a curve or magnitude derived therefrom.