Rock Drill Shank Reinforcement for Dust Ejection and Shear Resistance
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Solution Overview
Problem
Existing rock drilling tools with hard-metal heads and integral shanks face issues with wear and tear, leading to reduced service life and increased risk of shearing, as well as ineffective dust removal, which can cause compaction and explosions during deep drilling.
Innovation Solution
A drilling tool with a hard-metal drill head and integral shank featuring a helical conveying groove for dust removal and a diameter reinforcement in the drill head support region, enhancing the connection between the drill head and shank, allowing for improved torque transmission and reduced wear, while also facilitating efficient dust ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the drill shank has a constant maximum diameter in the axial direction, then the structure is simple and manufacturing is easy, but the connection between drill head and shank is weak and wear resistance is poor
Solution Approach 1:
The drill shank features a diameter reinforcement localized in the drill head support region, creating a non-uniform diameter profile. This local quality enhancement strengthens the connection between drill head and shank precisely where needed, without complicating the entire shank structure. The reinforcement region has a larger diameter than the rest of the shank, providing improved mechanical interlocking and wear resistance at the critical connection zone.
2Productivity
If the conveying groove diameter is small, then the drill shank diameter can be kept small for better maneuverability, but dust removal efficiency is reduced leading to compaction and explosion risks
Solution Approach 1:
The conveying groove is designed with a helical curvature winding around the drill shank. This curved, spiral configuration creates a continuous upward flow path for dust particles, efficiently removing them from the drilled hole. The helical shape maintains adequate groove cross-sectional area for effective dust transport while keeping the overall shank diameter compact, preventing dust compaction and explosion hazards.
3Power
If the connection face area between drill head and shank is small, then the device is compact and lightweight, but torque transmission is insufficient and shearing risk increases
Solution Approach 1:
The diameter reinforcement in the drill head support region creates a locally enlarged connection interface between the drill head and shank. This localized area expansion provides a larger bonding or mechanical connection surface precisely where torque transmission and anti-shearing strength are most critical, enhancing power transmission capability without increasing the overall size of the drilling tool.
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 solution provides a stable drill head connection, increased service life, reduced risk of shearing, and effective dust removal, preventing compaction and explosions, thus enhancing operator safety and drilling efficiency.
Implementation Method 1
a conveying portion that in particular has a conveying groove that winds in a helical manner about the bore shank
Data Source
AI summary
A drilling tool, in particular a rock drilling tool, for a portable machine tool includes a drill head, a drill shaft connected to the drill head, and a rotational axis. The drill head in one embodiment is a hard metal drill head, and the drill shaft in one embodiment is connected integrally with the drill head. The drill shaft is configured as one piece, has a guide section with guide groove winding in a spiral-shaped about the drill shaft for transporting away drilling dust, and has a securing section that is configured to detachably secure the drilling tool to a machine tool. The guide section has a diameter reinforcement at a drill head support region of the guide section neighboring the drill head.