Paired Boring Tool Layout to Prevent Chatter in Stepped Holes
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Solution Overview
Problem
Existing machining apparatuses for differential cases face issues with decreased machining accuracy due to tool chatter and vibration, particularly when cutting side gear holes, which are addressed by using a pair of cutting tools that rotate integrally around a center line with abutment surfaces butting together to stabilize the cutting process.
Innovation Solution
A cutting tool configuration with a pair of cutting tools attached to left and right machining units, featuring a shaft part with a cutting blade and an abutment surface, allowing them to rotate integrally around a center line with abutment surfaces butting together, preventing chatter and maintaining a moderate shaft length for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single long cutting tool is used to machine both left and right holes simultaneously, then cutting time is reduced, but machining accuracy decreases due to tool chatter and vibration
Solution Approach 1:
The single long cutting tool is divided into two separate cutting tools, each with a moderate length. The left cutting tool machines the left hole while the right cutting tool machines the right hole simultaneously. This segmentation eliminates the chatter and vibration problems associated with long cantilevered tools while maintaining high productivity through parallel machining of both holes.
Solution Approach 2:
Two cutting operations that would traditionally be performed sequentially are merged into a single simultaneous operation. The left and right cutting tools are positioned and activated together to machine both holes at the same time, achieving the productivity benefit of parallel processing without the drawbacks of using one extremely long tool.
2Device complexity
If a single long cutting tool is used to machine both left and right holes, then the number of tool changes is reduced, but the tool becomes unstable and vibrates during cutting
Solution Approach 1:
The single long cutting tool is segmented into two separate tools of moderate length. Each tool is supported by its own machining unit with proper bearing support, eliminating the instability and vibration inherent in long cantilevered tools while maintaining a simplified two-tool system.
Solution Approach 2:
The machining units act as intermediaries that provide proper support and control for each cutting tool. The left machining unit supports the left cutting tool and the right machining unit supports the right cutting tool, ensuring both tools remain stable during cutting operations.
3Manufacturing precision
If two separate cutting tools are used for left and right holes, then machining accuracy is maintained, but cutting time increases due to sequential operation
Solution Approach 1:
Two sequential cutting operations are merged into a single simultaneous operation. The left and right cutting tools are positioned and activated together to machine both holes at the same time, achieving the productivity benefit of parallel processing while maintaining the machining accuracy benefits of using separate, shorter tools.
Solution Approach 2:
The cutting process continues simultaneously on both left and right sides without interruption or sequential waiting. Both cutting tools operate continuously and concurrently, maximizing productivity while maintaining precision through the use of appropriately sized tools for each operation.
Data Source
AI summary
A cutting tool for boring that is attached to a machining apparatus and used for cutting a hole on a large-diameter side of a stepped hole of a workpiece is provided. The cutting tool for boring is a set of two tools, and each cutting tool for boring in the set of two includes a shaft part, a cutting blade laterally protruding from the respective shaft parts, and an abutment surface formed at the tip of each shaft part and used to cause the tips of the respective shaft parts to butt against each other. Each cutting tool for boring performs cutting while the two cutting tools for boring rotate integrally around the center line of the shaft parts in a coupled state in which the tips of the cutting tools for boring are butted together.