Drilling Tool Bit Segmentation for Wear Reduction
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Solution Overview
Problem
The existing drilling tool concentrates striking force on a single surface, leading to early wear of the pilot and ring bits, and struggles to transmit strong striking forces effectively due to a limited total abutting area.
Innovation Solution
The drilling tool features a pilot bit with multiple projections and a ring bit with corresponding recessed trenches and housing trenches, distributing the striking force across multiple surfaces to prevent wear and ensure efficient transmission, even under strong force conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single striking force transmitting surface and receiving surface are used, then the structure is simple, but the striking force concentrates on one surface causing early wear
Solution Approach 1:
The single striking force transmitting surface is segmented into multiple striking force transmitting surfaces (first, second, and third striking force transmitting surfaces) distributed around the pilot bit. Correspondingly, multiple striking force receiving surfaces are provided on the ring bit. This segmentation distributes the concentrated striking force across multiple contact points, preventing early wear while maintaining structural efficiency.
2Device complexity
If a single striking force transmitting surface is used, then the structure is simple, but the total abutting area is insufficient for transmitting strong striking forces
Solution Approach 1:
The striking force transmission interface is segmented into multiple surfaces arranged circumferentially. The first, second, and third striking force transmitting surfaces on the pilot bit correspond to first, second, and third striking force receiving surfaces on the ring bit, creating multiple abutting areas that collectively provide sufficient total abutting area for transmitting strong striking forces generated by the down-the-hole hammer.
Solution Approach 2:
The striking force transmission is extended from a single-point or single-surface contact to a multi-surface contact arrangement distributed in the circumferential dimension. By arranging multiple striking force transmitting surfaces around the pilot bit at different angular positions, the total abutting area is increased without significantly increasing structural complexity.
Data Source
AI summary
A drilling tool has: a casing pipe in a circular tubular shape; a cylindrical or annular ring bit rotatably fitted to a tip portion of the casing pipe; and a pilot bit inserted into an inner circumference of the ring bit for a striking force to be exerted to toward a tip end side, wherein the ring bit is engaged with and fitted to the casing pipe, projections are formed on an outer circumferential portion of the pilot bit, a recessed trench, and a housing trench, are formed in the inner circumferential part of the ring bit, a torque transmitting surface is formed in the projection, a torque receiving surface capable of abutting the torque transmitting surface is formed in the housing trench, striking force transmitting surfaces are formed in projections, and striking force receiving surfaces capable of abutting the striking force transmitting surfaces are formed in the ring bit.