Spiral Drill Bit Helical Grooves Reduce Grinding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional step drill bits require significant force and time to grind necessary clearances, leading to costly manufacturing and risk of damaging cutting surfaces during the grinding process.
Innovation Solution
A spiral drill bit with helical grooves and flutes that minimize grinding requirements, providing radial, axial, and diametral clearances for efficient cutting, and a process that includes simultaneous turning and milling to reduce grinding power and prevent edge nicking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional step drill bits are ground to form cutting surfaces and clearances, then the drill bit can cut holes of different diameters, but the grinding process requires significant force and time, increasing manufacturing cost
Solution Approach 1:
The patent applies preliminary action by forming the conical body with pre-defined helical grooves and flutes before the grinding operation. The helical grooves are machined into the conical body at predetermined angles and positions, which later serve as guides for the grinding wheel to automatically generate the cutting surfaces with proper clearances. This preliminary structuring eliminates the need for complex, time-consuming grinding operations to create the groove geometry from scratch.
Solution Approach 2:
The patent uses the helical grooves as an intermediary element that facilitates the grinding process. The grooves are first machined into the conical body, then the grinding wheel follows these pre-formed grooves to create the cutting surfaces. This intermediary structure allows the grinding operation to be simpler and faster, as the groove geometry is already established and merely needs to be refined into cutting surfaces with appropriate clearances.
2Manufacturing precision
If conventional step drill bits are ground to form cutting surfaces, then the drill bit achieves necessary clearances, but the grinding process risks damaging cutting surfaces through edge nicking
Solution Approach 1:
The patent applies preliminary action by first machining the helical grooves into the conical body using a milling machine, creating precise groove geometry before any grinding occurs. These pre-formed grooves serve as templates that guide the subsequent grinding wheel, ensuring that the cutting surfaces are generated with correct clearances without requiring aggressive grinding that could damage the edges. The preliminary grooving establishes the precise geometry that protects against edge nicking during the final grinding operation.
3Manufacturing precision
If conventional step drill bits are ground to form cutting surfaces, then the drill bit can effectively cut workpieces, but the grinding process requires considerable force, increasing power consumption
Solution Approach 1:
The patent applies preliminary action by pre-machining the helical grooves into the conical body before grinding. This preliminary grooving removes the bulk material and establishes the groove geometry, so that the subsequent grinding operation only needs to refine the surfaces and create the cutting edges with proper clearances. This significantly reduces the power required during grinding, as the most material-intensive removal has already been completed by the milling operation that formed the initial grooves.
Data Source
AI summary
A spiral drill bit for forming holes of a variety of sizes has a main body which provides first and second helical grooves. First and second flutes extend along the length of the main body to provide first and second helical groove segments. Cutting segments are provided between the helical groove segments. The method for forming the spiral drill bit includes turning the helical groove segments onto a round stock. An axial clearance and an initial diametral clearance are provided upon turning the helical grooves. A grinding process is used to form a radial clearance and a final diametral clearance. The reduction to the amount of grinding required to form the spiral drill bit results in a reduction to the cost of production and a reduction in the time necessary to produce the spiral drill bit.