Drill Bit Hard Insert Mechanical Interlock
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Solution Overview
Problem
Existing drill bits with hard metal inserts face challenges in achieving a durable connection due to the low temperature resistance of these inserts, requiring complex processes like hard soldering or additional components like sleeves for welding, which are inefficient and require additional materials.
Innovation Solution
A drill bit design featuring a material projection made of welding material that engages form-fittingly into the hard material insert, creating a bonded connection with the drill head, eliminating the need for additional components and allowing for a thermally and mechanically durable connection without the need for high-temperature processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard solder connection is used to secure hard metal inserts, then connection durability is improved, but manufacturing complexity and process time increase
Solution Approach 1:
The patent replaces the thermal field-based hard solder connection with a mechanical field-based cold connection system. The connection element with engagement portions inserts into recesses in the drill head, creating a mechanical interlock without requiring heating or soldering processes. This substitution of the connection mechanism eliminates the need for high-temperature processing while maintaining secure attachment of the hard metal insert.
Solution Approach 2:
The patent introduces a connection element as an intermediary component between the hard metal insert and the drill head. This connection element features engagement portions that fit into recesses of the drill head, serving as a mediator that transmits mechanical loads without requiring direct thermal bonding. The intermediary component enables secure attachment through mechanical geometry rather than thermal processes.
2Strength
If welding is used to connect hard metal inserts, then connection strength is improved, but temperature resistance requirements cannot be met
Solution Approach 1:
The patent replaces the thermal field-based welding process with a mechanical field-based cold connection system. The connection element creates a mechanical interlock through engagement portions fitting into recesses, eliminating the need for heating that would compromise the temperature resistance of hard metal inserts. This mechanical substitution achieves connection strength without thermal damage.
3Ease of manufacture
If additional components like sleeves are added for welding, then welding capability is enabled, but device complexity increases
Solution Approach 1:
The patent extracts the unnecessary intermediate component (sleeve) from the connection system. Instead of using a sleeve that requires welding to the drill head, the connection element directly engages with the drill head recesses through mechanical geometry. This extraction of the problematic intermediate component simplifies the overall device while maintaining the ability to securely attach hard metal inserts.
Solution Approach 2:
The patent merges the functions of the connection element and the insert holder into a single integrated component. The connection element simultaneously provides the mechanical interlock with the drill head and secures the hard metal insert, eliminating the need for separate sleeves or complex multi-component assemblies. This functional merging reduces component count while maintaining manufacturing capability.
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 ensures a reproducible cutting action and enhanced durability by securing the hard material inserts with a simple, thermally resilient connection that stabilizes the cutting edge, reducing vibrations and improving drilling performance.
Implementation Method 1
a material projection (35) made of welding material, which is bonded to the drill head (10) via the welding material
Data Source
AI summary
A drill bit (11) for the drilling, in particular the rotary percussive drilling, of a hole, in particular a tap hole of a melting furnace, the drill bit (11) comprising a drill head (10), which has at least one hard material insert (16), and a base body (12) for connecting the drill bit to a driving element, the hard material insert (16) being inserted into a seat, which is formed in an axial end face (13) of the drill head (10), in such a manner that at least a head cutting edge (18) of the hard material insert (16) protrudes beyond the axial end face (13), wherein the seat has a flank portion and a mating flank portion located opposite the flank portion, between which the hard material insert (16) is disposed, the flank portion, which is disposed opposite a recess formed in the hard material insert (16), being provided with a material projection (35) which is at least partially made of a welding material, is bonded to the drill head (10) via the welding material and protrudes into the recess so as to establish a form-fitting connection with the hard material insert (16).