Fixture Tool Indexing Using Gripper-Located Reference Features
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Solution Overview
Problem
Current indexing methods in manufacturing, such as probing and fixture-based systems, are time-consuming and expensive, especially for large structures like aircraft components, and are not conducive to continuous manufacturing processes.
Innovation Solution
An indexing apparatus comprising a fixture tool, an indexing feature, and a gripper, with a controller that locates the fixture tool relative to an operation cell by engaging the indexing feature, allowing for quick and accurate indexing of automated machines relative to the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If probing or fixture-based indexing methods are used, then workpiece location accuracy is achieved, but setup time increases significantly
Solution Approach 1:
Indexing features are pre-defined and integrated into the fixture tool design before manufacturing operations begin. The fixture tool includes built-in indexing features that automatically establish workpiece location when the workpiece is secured, eliminating the need for time-consuming probe measurements or adjustments during setup.
Solution Approach 2:
The fixture tool automatically performs the indexing function through its integrated indexing features. When the workpiece is secured to the fixture tool, the indexing features automatically establish the precise location relationship between the workpiece and the automated machine, making the indexing process self-executing rather than requiring separate probing operations.
2Measurement precision
If extensive probing or large fixtures are used for large structures, then indexing accuracy is maintained, but device complexity and cost increase
Solution Approach 1:
The indexing function is segmented into discrete, standardized indexing features that are integrated into the fixture tool. Rather than using a single complex fixture system, the solution divides the indexing task into manageable features (such as precision locators, datum surfaces, or mechanical stops) that can be independently designed and combined in the fixture tool.
Solution Approach 2:
The fixture tool is designed with multi-functional indexing features that can accommodate different workpiece types and configurations. The standardized indexing features serve multiple purposes: establishing location, providing repeatable positioning, and enabling quick changeovers, thereby reducing overall fixture complexity while maintaining indexing accuracy across various manufacturing scenarios.
3Measurement precision
If traditional indexing methods are used, then workpiece location is established, but productivity decreases due to extensive setup requirements
Solution Approach 1:
Indexing features are pre-configured in the fixture tool design, allowing workpiece location to be automatically established as soon as the workpiece is secured. This preliminary preparation eliminates the need for time-consuming probing or adjustment operations during each setup, enabling faster workpiece changeovers and higher manufacturing throughput.
Solution Approach 2:
The integrated indexing features enable continuous manufacturing operations by eliminating idle setup time. As one workpiece is being processed, the next workpiece can be quickly positioned and indexed using the pre-configured fixture features, maintaining continuous productive action without interruption for extensive indexing procedures.
Data Source
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AI summary
An indexing apparatus (100) includes a fixture tool (102), movable relative to an operation cell (106) and an indexing feature (104), fixed relative to the fixture tool (102). The indexing apparatus also includes a gripper (108), configured to engage the indexing feature. The indexing apparatus further includes a controller (110), in communication with the gripper (108). The controller (110) is configured to locate the fixture tool (102) relative to the operation cell (106) from a gripper location (114) of the gripper (108), engaged with the indexing feature (104).