Collet Chuck Wear Indication for Precision Machining
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Solution Overview
Problem
The collet chuck in Swiss-type lathes experiences frictional wear due to clamping forces and cutting pressures, leading to a decrease in machining precision and quality, with wear often detected too late, resulting in unplanned downtimes and rejects.
Innovation Solution
A collet chuck with a wear indicator, featuring radially extending blind bores in the jaws that convert to through-holes upon reaching maximum wear, allowing for visual or remote monitoring of wear, and optionally incorporating wear-resistant markings or electrical components that signal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the collet chuck operates continuously with clamping forces, then productivity is maintained, but frictional wear increases leading to decreased manufacturing precision
Solution Approach 1:
The patent applies preliminary action by creating blind holes in the collet chuck jaws before wear occurs. These blind holes are positioned such that when wear reaches a critical threshold, material is removed from the jaw surface, causing the blind holes to become through-holes. This allows wear to be detected before it significantly impacts machining precision, enabling proactive replacement of the collet chuck.
2Reliability
If wear detection is performed through random checks, then some quality losses are detected, but detection occurs too late resulting in unplanned downtimes
Solution Approach 1:
The patent implements feedback by creating a visible indication system through the blind holes. As wear progresses, the blind holes gradually become through-holes, providing continuous visual feedback on the wear state of the collet chuck. This allows operators to monitor wear in real-time during operation and plan replacements proactively, eliminating the need for random checks and avoiding unplanned downtimes.
3Manufacturing precision
If the collet chuck is replaced proactively, then machining precision is maintained, but device complexity increases due to wear indicator features
Solution Approach 1:
The patent applies local quality by adding wear indicator features (blind holes) only in specific locations on the collet chuck jaws where wear occurs. Rather than making the entire collet chuck more complex, the solution locally modifies the jaw surfaces with simple cylindrical holes that require minimal additional manufacturing steps and do not affect the overall structural integrity or function of the collet chuck.
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
Enables timely detection of wear in the collet chuck, preventing the production of faulty parts and reducing unplanned downtimes by allowing for proactive replacement of the collet chuck.
Implementation Method 1
The feed movement of the material rod in the closed state of the collet chuck generates a frictional force on the inner guide surfaces of the collet chuck... This frictional force leads to frictional wear of the clamping surfaces
Data Source
AI summary
Collet chuck having a plurality of jaws which are radially movable with respect to one another and which, with their clamping faces, form a common receptacle for guiding a rod that is to be machined in a lathe, characterized by a blind hole which is routed in at least one jaw from the outer face, opposite the clamping face of the jaw, in the direction of the clamping face, with a blind-hole bottom which is delimited on the one hand by the clamping face and on the other hand by the blind hole and which, through wear of the clamping face, is configured to effect the formation of a through-hole indicating the wear of the collet chuck.