Drill Tool Head Axial Connector Design for Torque Transmission
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Solution Overview
Problem
Existing drilling tools face issues with torque transmission, chip evacuation, and structural weakness due to radially oriented securing screws and a central centering pin, which can lead to resilient expansion and weakened core cross-sections.
Innovation Solution
A drilling tool design featuring a driving connector with a peripheral web on the drilling member and a corresponding receiving pocket on the tool head, where the driving web is surrounded by a contact face extending along the periphery, allowing for gap-free axial seating and efficient coolant introduction, and the screws are passed through thicker margin areas to minimize weakening of the driving web and adaptor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If radially oriented securing screws are used to fix the tool head, then the tool head can be securely attached, but the drilling member is weakened and structural strength deteriorates
Solution Approach 1:
The securing function is segmented from the radial direction to the axial direction, with screws passing through the driving web rather than the drilling member, thereby separating the attachment function from the structural integrity of the drilling member
Solution Approach 2:
The securing screws are extracted from the drilling member and relocated to pass through the driving web and tool head, removing the weakening effect from the drilling member while maintaining secure attachment
2Manufacturing precision
If a central centering pin is used to align the tool head, then positioning accuracy is improved, but the core cross-section of the drilling member is weakened
Solution Approach 1:
The centering pin is extracted from the drilling member and relocated to the tool head, eliminating the weakening of the drilling member's core cross-section while maintaining positioning accuracy through the driving web geometry
Solution Approach 2:
The centering function is shifted from a radial element (pin through drilling member) to an axial element (driving web geometry), changing the dimensional approach to achieving positioning
3Reliability
If radially oriented securing screws are used, then attachment is achieved, but resilient expansion of the driving tangs occurs under high torque
Solution Approach 1:
Instead of securing the tool head radially to the drilling member, the securing is inverted to pass axially through the driving web, reversing the direction of fastening forces to avoid lateral stress on driving tangs
Solution Approach 2:
The high torque that causes resilient expansion is converted into a beneficial axial clamping force through the offset screw arrangement, pressing the driving web against the drilling member rather than causing lateral expansion
4Ease of manufacture
If an axial gap exists between drilling member and tool head, then assembly is easier, but chip evacuation becomes problematic
Solution Approach 1:
The axial gap is preliminarily eliminated by designing the driving web and receiving pocket with interference fit or precise clearance, ensuring gap-free seating before operation to enable effective chip evacuation
Data Source
AI summary
A drill includes a tool body having a fluted portion having a second end and a tool head portion, having a cutting tip and at least one cutting edge, removably connected to the second end of the fluted portion. The fluted portion includes a receiving pocket disposed in the second end and is defined by a peripheral side wall extending about the periphery of the receiving pocket. The tool head portion includes a driving projection configured to be inserted into the receiving pocket. The driving projection and receiving pocket have corresponding elongated, curvilinear, dog-bone shapes. The driving projection includes a first end portion, a second end portion, and a central portion disposed between connecting the first end portion and the second end portion. The first end portion and the second end portion each have a width that is substantially greater than a width of the central portion.