Coaxiality Detecting Tool for Automotive Cone Holes
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Solution Overview
Problem
Current machining processes for detecting the coaxiality of a straight hole relative to a cone hole axis in automobile parts are inefficient due to the need for three-coordinate clamping, resulting in low efficiency and a need for a simple and convenient detection tool.
Innovation Solution
A coaxiality detecting tool comprising a hexagon flange nut, a measuring column, and a detection sleeve, where the measuring column includes a threaded column, a cone, a cylinder, a detection column, and a guiding cone, allowing for precise detection of coaxiality by matching the cone with the workpiece's cone hole and checking uniform contact of the detection sleeve's conical surface with the workpiece's orifice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If three-coordinate clamping is used for detection, then detection accuracy can be maintained, but detection efficiency is very low
Solution Approach 1:
The detection tool is divided into separate functional components: a positioning cone for locating the workpiece, a measurement column for precise measurement, and a detection sleeve for coaxiality verification. This segmentation allows each component to perform its specific function independently, simplifying the overall clamping process while maintaining detection accuracy.
Solution Approach 2:
The measurement column acts as an intermediary between the positioning cone and the detection sleeve. It transfers the positional information from the cone hole to the straight hole detection, enabling accurate coaxiality measurement without requiring complex multi-coordinate clamping operations.
2Ease of operation
If a simple detection tool is used, then ease of operation is improved, but detection precision may be compromised
Solution Approach 1:
The positioning cone is pre-configured with precise geometric parameters (cone angle, diameter tolerances) to automatically locate the workpiece in the correct position. This preliminary positioning action ensures that subsequent measurements are taken from a known reference point, maintaining precision while simplifying operation.
Solution Approach 2:
The detection sleeve contains an inner hole that is a precise copy of the straight hole being measured, with matching diameter and tolerance specifications. This copying approach allows direct comparison and verification of coaxiality without requiring complex measurement systems, achieving high precision through geometric replication.
3Manufacturing precision
If precise geometric parameters are specified for all components, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
Precise geometric parameters and tight tolerances are applied only to critical components where they directly affect measurement accuracy: the positioning cone's conical surface, the measurement column's cylindrical surface, and the detection sleeve's inner hole. Non-critical components have relaxed tolerances, reducing manufacturing cost while maintaining overall detection precision.
Solution Approach 2:
The design specifies functional parameter relationships rather than absolute dimensions for all components. For example, the detection column diameter is defined as ΦB=(ΦA−0.3+0.036) mm relative to the detection sleeve inner hole diameter ΦA, allowing flexible manufacturing within tolerance ranges while ensuring proper fit and function.
Data Source
AI summary
Disclosed is a coaxiality detecting tool composed of a hexagon flange nut, a measuring column and a detection sleeve. When the coaxiality detecting tool is used, a cone of the measuring column is matched with a cone hole of a detected workpiece, the hexagon flange nut is matched with a threaded column of the measuring column, and the measuring column is fixed on the workpiece; an inner hole of the detection sleeve is matched with a detection column, the conical surface of the detection sleeve is in contact with the orifice of a ΦE hole in the workpiece, whether the whole conical surface is in uniform contact with the orifice of the ΦE hole is observed, and if in uniform contact, the detected coaxiality is qualified, otherwise, the detected coaxiality is unqualified.