Cemented Carbide Masonry Drill Head for Debris Removal and Joining
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Solution Overview
Problem
Masonry drill heads currently face inefficiencies in transporting debris out of holes in masonry materials, leading to longer drilling times and reduced drill bit lifetimes, and also struggle with heat-induced joining to shafts.
Innovation Solution
A masonry drill head made from sintered cemented carbide with a section-wise planar joining end and a working end designed for percussive motion, featuring conveying webs and grooves that increase cross-sectional area towards the joining end, enhancing debris intake and transport while improving heat-induced joining properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-sectional solid material area is increased towards the joining end to strengthen the joining end, then the joining strength is improved, but the debris intake of conveying grooves is reduced
Solution Approach 1:
The patent introduces a longitudinal dimension to the cross-sectional area variation, creating a gradient structure where the solid material area increases towards the joining end while maintaining adequate debris intake channels. This dimensional approach allows simultaneous optimization of both joining strength and debris capacity by distributing material strategically along the length of the drill head.
Solution Approach 2:
The patent applies different cross-sectional area characteristics to different regions of the drill head. The joining end has increased solid material area for strength, while the working end maintains larger conveying groove cross-sections for debris intake. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Productivity
If the conveying groove cross-section is increased to improve debris transport, then debris removal efficiency is improved, but the structural strength of the drill head is reduced
Solution Approach 1:
The patent compensates for reduced cross-sectional area in conveying grooves by extending their length and optimizing their three-dimensional geometry. The grooves are designed with specific longitudinal profiles that maintain transport capacity despite smaller cross-sections, resolving the contradiction between debris transport efficiency and structural strength.
Solution Approach 2:
The patent optimizes multiple geometric parameters of the conveying grooves simultaneously, including cross-sectional area, length, orientation, and profile shape. By adjusting these parameters in combination, the design achieves adequate debris transport capacity while maintaining necessary structural strength throughout the drill head.
3Loss of time
If the drill head design is optimized for debris transport, then drilling time is reduced, but the joining properties for heat-induced joining are worsened
Solution Approach 1:
The patent creates a planar joining end with distinct geometric characteristics different from the working end. This local differentiation allows the joining end to be optimized for heat-induced joining (with flat, uniform surface for better thermal contact and bonding) while the rest of the structure maintains features optimized for debris transport during drilling operations.
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 improves debris transport and exit from the drill head, geometrically strengthens the joining end for better shaft attachment, and increases the debris intake without weakening the drill head, resulting in enhanced drilling efficiency and extended tool life.
Implementation Method 1
a working end for shattering masonry material under a percussive motion
Implementation Method 2
an additional conveying rotatory motion by which the debris is transported out of the hole
Implementation Method 3
an at least section-wise planar joining end for heat induced joining to a shaft
Implementation Method 4
Examples for 'heat induced joining' are welding, brazing and soldering
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A masonry drill head (100) made from a sintered cemented carbide, characterized in that the masonry drill head has an at least section-wise planar joining end for heat induced joining to a shaft, a working end (104) for shattering masonry material under a percussive motion, at least two conveying webs (101a, 101b) each emerging from the joining end and at least two conveying grooves each extending between two of the conveying webs (101a, 101b), wherein a cross sectional solid material area of the masonry drill head increases towards the joining end, such that a masonry material debris intake of at least one of the conveying grooves increases towards the working end (104).