Percussive Drill Bit Radial Fluid Flow Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional drill bits fail to achieve sufficient fluid flow across all parts of the cutting face, leading to shortened life and early failure.
Innovation Solution
The drill bit design includes a crown with a circumferential outer surface and a cutting face that defines a face channel. At least one bore extends through the crown from the shank's interior space to the cutting face, with outlets positioned predominantly on one side of the drill bit. This configuration promotes direct radial fluid flow through slots defined by the face channel and bore outlets, ensuring efficient fluid distribution across the cutting face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional drill bit design is used, then the structure is simple, but fluid flow across the cutting face is insufficient
Solution Approach 1:
The drill bit is segmented into distinct functional zones: a crown portion with cutting elements, a face channel defined by the cutting face, and a bore extending through the crown. This segmentation allows fluid to flow through separate pathways (bore and face channel) that deliver cooling fluid to different regions of the cutting face, thereby increasing overall fluid flow distribution without creating a monolithic complex structure.
Solution Approach 2:
Different regions of the drill bit are assigned different functional qualities: the bore provides fluid delivery to the crown interior, while the face channel provides fluid delivery across the cutting face surface. This local differentiation ensures that each region contributes to fluid flow in its specific area, improving overall cooling coverage while maintaining simple geometric forms for each component.
2Duration of action of stationary object
If conventional drill bit design is used, then manufacturing is simple, but drill bit life is shortened
Solution Approach 1:
The drill bit design incorporates pre-planned fluid flow pathways (bore and face channel) that are formed during manufacturing. By establishing these cooling fluid delivery routes in advance, the design ensures adequate cooling of cutting elements during operation, which prevents overheating and extends drill bit life. The preliminary structuring of fluid pathways allows for straightforward manufacturing processes while achieving the extended service life goal.
3Temperature
If insufficient fluid flow is provided, then the structure remains simple, but cooling and lubrication are inadequate
Solution Approach 1:
The drill bit utilizes hydraulic principles by channeling cooling fluid through the bore and face channel to deliver pressurized fluid directly to the cutting face and crown interior. This hydraulic fluid delivery system effectively removes heat through convection and cooling, maintaining lower operating temperatures at the cutting interface without requiring complex mechanical cooling mechanisms.
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 enhances fluid flow across the center of the cutting face, improving drill bit performance and extending its operational life by ensuring consistent cooling and lubrication.
Implementation Method 1
The outlet of each bore comprises a slot that is defined by the base surface of the face channel and opposing surfaces of the wall portion that partially defines and partially surrounds the bore, thereby permitting direct radial flow of fluid through the slot and into the face channel.
Implementation Method 2
Fluid is often pumped through the drill string to outlets at a distal end of the drill bit to cool the drill bit.
Implementation Method 3
The design enhances fluid flow across the center of the cutting face, improving drill bit performance and extending its operational life by ensuring consistent cooling and lubrication.
Data Source
AI summary
A drill bit having a longitudinal axis extending through a center of the drill bit is disclosed. A plane including the longitudinal axis of the drill bit bisects the drill bit and divides the drill bit into first and second sides. The drill bit has a shank defining an interior space and a crown coupled to the shank. The crown has a circumferential outer surface, a cutting face, and at least one bore that extends through the crown from the interior space of the shank to the cutting face. Each bore has an outlet defined by the cutting face. The cutting face defines a face channel that extends to the circumferential outer surface of the crown. The face channel has an outlet where the face channel meets the circumferential outer surface of the crown. The longitudinal axis intersects the face channel. The majority of the perimeter of the outlet of each bore is positioned on the first side of the drill bit. The outlet of the face channel is on the second side of the drill bit.