Stone Chisel Drill Bit With Widening Intake Passages
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Solution Overview
Problem
Existing drill bits for chiseling rock face challenges in efficiently transporting drill cuttings away without clogging, particularly due to the design of intake passages with constant or decreasing cross sections.
Innovation Solution
The drill bit features a hollow shank with intake passages that widen from the intake openings to the delivery passage, designed to reduce clogging, with a unique geometry and material composition using sintered tungsten carbide cutting edges and a conical interference fit for efficient rock chiseling and cutting material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intake passages have constant or decreasing cross section, then structural simplicity is maintained, but drill cuttings transport efficiency deteriorates and clogging occurs
Solution Approach 1:
The patent applies parameter changes by varying the cross-sectional dimensions of the intake passage along its length. The passage transitions from a smaller cross-section at the intake opening to a larger cross-section at the delivery end, creating a widening geometry that reduces flow resistance and prevents clogging while maintaining efficient cuttings transport.
2Productivity
If intake opening cross-sectional area is increased, then cuttings entry is improved, but passage clogging tendency increases
Solution Approach 1:
The patent resolves this contradiction by implementing a gradual parameter change in the passage cross-section. The intake opening has a smaller area optimized for entry, while the passage widens progressively toward the delivery end, maintaining low velocity and pressure that prevent clogging while still allowing efficient cuttings entry.
3Strength
If cutting edges are made of sintered tungsten carbide, then rock chiseling capability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent employs composite materials by using sintered tungsten carbide for the cutting edges. This hard material is bonded to the drill head body, combining the high strength and wear resistance of tungsten carbide with the toughness of the base material, achieving superior rock chiseling capability while accepting the increased manufacturing complexity of sintering and bonding processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents clogging and enhances the transportation of drill cuttings, ensuring efficient rock chiseling and material removal with reduced mechanical demands and high material density, allowing for effective use in mineral construction materials like concrete and brick.
Implementation Method 1
A cross section of the intake passages increases from the intake opening to the delivery passage. The widening intake passage has less of a tendency to clog than an intake passage having a constant or even decreasing cross section.
Implementation Method 2
The drill head is connected to the hollow shank by means of a conical interference fit
Data Source
AI summary
A drill bit for chiseling stone includes an impact face at an insertion end of the drill bit, a hollow shank, where a delivery passage is defined within the hollow shank, and a drill head, where the drill head has, at a front end of the drill head, a cutting edge, an intake opening, and an intake passage. The intake passage connects the intake opening to the delivery passage. A cross section of the intake passage increases from the intake opening to the delivery passage.