Masonry Drill Head Geometry for Higher Load and Lower Friction
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Solution Overview
Problem
Conventional rock drilling tools lack comprehensive optimization in terms of destruction capacity, friction, and material consumption, despite increased resilience due to material reinforcements, which limits their maximum load and service life.
Innovation Solution
A drilling tool with a cutting body geometry that increases in thickness radially from the cutting tip, featuring an arcuate cutting edge design and secondary cutting bodies, optimized for varying loads around the longitudinal axis, allowing for increased material removal and reduced friction losses by effectively managing drill cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If material reinforcements are added to increase resilience, then service life is improved, but material consumption increases and comprehensive optimization is not achieved
Solution Approach 1:
The cutting body features variable thickness with increasing radial distance from the cutting tip, creating local quality variations. The thickness increases from a minimum at the cutting tip to a maximum at the peripheral region, allowing material to be concentrated where loads are highest while reducing material in lower-stress areas, thus optimizing the balance between service life and material consumption
Solution Approach 2:
The geometric parameters of the cutting body are optimized by varying the thickness parameter radially. The thickness increases with increasing radial distance from the cutting tip, adapting the structural parameters to match the distribution of mechanical loads during drilling operation
2Strength
If more material is used in the cutting body, then resilience increases, but destruction capacity and friction optimization are not achieved
Solution Approach 1:
Different regions of the cutting body have different thicknesses tailored to their functional requirements. The peripheral region with higher thickness provides resilience, while the cutting tip region with minimal thickness maintains destruction capacity by reducing weight and inertia
Solution Approach 2:
The cutting body geometry transitions from a conventional uniform design to a radially variable thickness design, adding a dimensional gradient from the cutting tip toward the peripheral region. This dimensional variation allows simultaneous optimization of multiple properties that would be conflicting in a uniform design
3Force
If the cutting body is made more massive to handle higher loads, then maximum load capacity increases, but material consumption increases
Solution Approach 1:
The cutting body is designed with local quality variations where thickness increases radially from the cutting tip. This creates a gradient structure that provides high load capacity at the peripheral region while minimizing material usage at the cutting tip and intermediate regions
Solution Approach 2:
The cutting body represents a composite structure combining regions of different thicknesses and material distribution, creating a functionally graded design that optimizes the ratio between load capacity and material consumption
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The invention relates to a drilling tool (1), in particular for drilling and/or cutting devices, for drilling in brickwork, concrete, stone and the like, comprising a drill head (5) and at least one cutting member (6), wherein the cutting member (6) is located at a free end (7) of the drill head (5), wherein a blade tip (34) of the cutting member (6) protrudes axially beyond the drill head (5) on the drilling direction side in the direction of a longitudinal axis (Ll) of the drilling tool (1) and wherein the cutting member (6) extends radially beyond the drill head (5), wherein the first cutting member (6) comprises at least two blades (16, 19) with blade edges (22, 23), wherein the blades (16, 19) extend radially outward from the blade tip (34).