Replaceable Guide Bushing Insert for Worn Conical Surfaces
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Solution Overview
Problem
The conical outer surface of guide barrels for cutting tools wears out quickly, leading to high replacement costs and inefficiencies in drilling aeronautical structural parts, as the entire barrel is often replaced rather than just the worn portion.
Innovation Solution
A guide bush design featuring a main body with a screwable insert for the conical outer surface, allowing the insert to be replaced independently while extending the life of the main body, thus reducing replacement costs and enabling easy diameter changes for different cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-piece guide barrel is used, then the structure is simple and manufacturing is easier, but the entire barrel must be replaced when the conical surface wears out, increasing operational costs
Solution Approach 1:
The guide barrel is divided into two separate components: a main body and a conical insert. The insert can be independently replaced when worn, while the main body remains in service. This segmentation allows selective replacement of only the worn conical surface rather than the entire barrel, reducing material loss and operational costs.
2Duration of action of stationary object
If an insert is used for the conical surface, then replacement frequency of the main body is reduced, but the device complexity increases due to additional components
Solution Approach 1:
The conical surface is extracted from the main barrel body and implemented as a separate removable insert. This allows the insert to be replaced independently when worn, extending the service life of the main body without requiring complete barrel replacement. The extraction principle reduces overall device complexity by enabling modular maintenance.
3Manufacturing precision
If the entire barrel is replaced when the conical surface wears, then manufacturing precision is maintained, but productivity decreases due to frequent replacements
Solution Approach 1:
By segmenting the guide barrel into a main body and a replaceable conical insert, the system maintains manufacturing precision through precise fitting between components while improving productivity. The insert can be quickly replaced without replacing the entire barrel, reducing downtime and increasing overall productivity.
4Device complexity
If a one-piece barrel is used, then the device complexity is low, but adaptability is reduced when diameter changes are needed for different cutting tools
Solution Approach 1:
The guide barrel system becomes dynamic and adaptable through the removable insert design. Different conical inserts with various diameters can be exchanged based on the cutting tool requirements, enabling the system to adapt to different tool sizes without changing the main body structure. This maintains low overall complexity while providing high adaptability.
Data Source
Figure 1~3
AI summary
The cutting tool guide barrel (114) has a rear end (206) with a conical external surface for being press-fitted into a barrel holder of a drilling machine. It comprises a main body (202) having a front end (204) and a rear end (206) with the conical external surface, and a cutting tool guide insert (208) designed to be screwed into the front end (204) of the main body (202).