Deep Hole Boring Head With Pilot Drill Bit for Titanium
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Solution Overview
Problem
Existing deep hole boring tools are unsuitable for titanium materials due to titanium adhesion to guide pads, leading to seizure, high torque requirements, premature pad wear, and poor hole geometry, making it difficult to achieve accurate and rectifiable holes.
Innovation Solution
A deep hole boring head with a pilot drill bit for centering, eliminating the need for guide pads and allowing for sufficient torque with existing machines, and integral bronze pads for protecting the hole walls during removal, reducing material costs and improving hole geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guide pads are used to guide the boring head, then the boring head can be guided during boring, but titanium adheres to the guide pads causing seizure and high torque requirements
Solution Approach 1:
The patent removes the guide pads from the boring head design. Instead of using external guide pads that contact the hole walls, the invention uses a pilot drill bit that centers the boring head before the cutting edges engage. This extraction of the problematic guide pads eliminates titanium adhesion and the associated high torque requirements while maintaining guidance functionality through the pilot bit.
2Ease of operation
If guide pads are used to guide the boring head, then the boring head can be guided during boring, but the guide pads experience premature wear requiring frequent replacement
Solution Approach 1:
The patent eliminates the guide pads entirely from the design. The guidance function is transferred to a pilot drill bit that centers the boring head. This removal of the stationary guide pads eliminates their premature wear and the need for frequent replacement, while the pilot bit provides the necessary centering and guidance functionality.
3Ease of operation
If guide pads are used to guide the boring head, then the boring head can be guided during boring, but the hole geometry becomes poor with significant deviations from the boring axis
Solution Approach 1:
The patent employs a pilot drill bit that performs preliminary centering action before the main cutting edges engage. This preliminary action of the pilot bit establishes the correct boring axis and centers the boring head, ensuring accurate hole geometry. The pilot bit creates a pilot hole or establishes the center point, allowing subsequent cutting edges to follow the correct path, thereby eliminating deviations from the boring axis.
4Ease of operation
If guide pads are used to guide the boring head, then the boring head can be guided during boring, but carbide particles from the guide pads contaminate subsequent machining
Solution Approach 1:
The patent removes the guide pads that are made of carbide or similar hard materials. By eliminating these guide pads, the source of carbide particle contamination is removed. The guidance function is instead performed by a pilot drill bit that does not generate harmful particles, thus preventing contamination of subsequent machining operations.
5Device complexity
If conventional boring head design is used, then the structure is simple, but it becomes impossible to develop sufficient boring torque to continue rotating the head
Solution Approach 1:
The patent segments the boring head into distinct functional components: a pilot drill bit for centering, cutting edges for material removal, and bronze pads for protection during removal. This segmentation allows each component to perform its specific function efficiently. The pilot bit handles guidance and centering, reducing the torque burden on the main cutting edges, thereby enabling sufficient boring torque to be developed without overcomplicating the overall structure.
Data Source
AI summary
A deep hole boring head is provided which is capable of rotating about a central axis, a body whose front part has at least one cutting edge followed by a recess which leads to a duct inside the body, this duct allowing the chips formed during the boring to be cleared away rearwards, and includes at a front end thereof and at a center portion thereof a pilot drill bit capable of guiding the head during boring. Use for the boring of a production piece is made of titanium, the ratio L/D between the depth L of the hole bored and the diameter D of the latter being greater than or equal to 10, and the diameter D being greater than or equal to 65 mm.