Brazed Drill Bit Anchoring With Variable Solder Gap Geometry
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Solution Overview
Problem
Existing rock drills face challenges with inconsistent clamping forces due to manual notching, leading to uneven concentricity and reduced durability, especially with larger diameters, and require costly and complex manufacturing processes for precise anchoring of cutting bodies.
Innovation Solution
A drill design featuring a soldering gap that widens radially, allowing for optimal clamping and centering without manual notching, with a star-shaped or conical configuration that reduces stress and manufacturing effort, and a symmetrical or asymmetrical distribution of soldering gaps for enhanced stability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual notching is used to create clamping force, then the cutting body can be secured in the body holder, but the clamping force varies from drill to drill leading to inconsistent concentricity and durability
Solution Approach 1:
The invention changes the geometric parameters of the soldering gap, making it wider at the outer circumference and narrower at the inner circumference. This parameter variation creates a consistent spring effect that compensates for manufacturing tolerances and angular inaccuracies, ensuring uniform clamping force across all drills without manual notching.
Solution Approach 2:
The soldering gap is segmented into zones with different widths - a narrower inner zone for clamping and a wider outer zone for stress reduction. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between secure clamping and stress management.
2Strength
If the soldering gap is made narrow for clamping, then the cutting body is securely anchored, but stresses increase toward the outside reducing durability
Solution Approach 1:
The soldering gap width is varied radially, being narrow at the inner circumference for strong clamping and wide at the outer circumference for stress reduction. This gradient design allows the structure to maintain strength where needed while reducing stress concentration in critical areas.
Solution Approach 2:
Different sections of the soldering gap have different widths tailored to their specific functional requirements. The inner section provides clamping strength while the outer section provides stress relief, creating local optimization throughout the structure.
3Reliability
If manual notching is performed to achieve proper clamping, then the cutting body can be secured, but the process is time-consuming and increases manufacturing costs
Solution Approach 1:
The variable-width soldering gap design is self-regulating and self-centering. The spring effect automatically compensates for tolerances and creates consistent clamping force without requiring manual intervention or complex machining operations, making the manufacturing process more efficient.
Solution Approach 2:
By changing the soldering gap geometry to have varying width, the design eliminates the need for manual notching operations. The geometric configuration itself provides the clamping mechanism, converting a manual process into an automated feature of the design.
4Duration of action of stationary object
If the soldering gap is widened radially outward for stress reduction, then durability improves, but the gap becomes larger requiring more solder material
Solution Approach 1:
The soldering gap width is optimized with a gradient distribution - narrow where clamping is needed and wide where stress reduction is needed. This parameter optimization ensures that solder material is used efficiently, providing maximum durability with minimum material consumption.
Solution Approach 2:
The solder gap provides different functions at different locations, with material quantity optimized for each local requirement. This localized optimization reduces overall solder consumption while maintaining extended service life through stress reduction in critical outer areas.
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
This design improves concentricity and durability, reduces stress and manufacturing costs, and enhances the service life of the drill by allowing for a more even distribution of forces and easier production, particularly effective in reinforced rock drilling.
Implementation Method 1
Widening the brazing gap toward the outside has the particular advantage of reducing stresses, which typically increase toward the outside. This allows for compensation for angular inaccuracies of the cutting edge of the cutting body or manufacturing inaccuracies during slot creation.
Implementation Method 2
The body is brazed into the body holder, thus securely securing it.
Data Source
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AI summary
The invention has a drill with a cutting body (18) made of hard metal, through which a drill axis (20) extends. This is firmly anchored in a body mount by means of a solder (40), with a soldering gap being formed between the hard metal plate and the body mount. The soldering gap (42) changes in its cross section, in particular in its width, starting from a drill axis (20) in the radial direction.