Core Drill Countersinking Attachment for Durable Flush Wall Recesses
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Solution Overview
Problem
Existing core drilling attachments for installing hollow wall boxes are not durable and require frequent replacement due to material wear and thermal stress, and they are often unsuitable for different types of walls, leading to surface damage.
Innovation Solution
A core drilling attachment with a tubular drill bit and an edge countersinking element featuring multiple cohesively connected sinking particles that form a layer-like structure, allowing for effective removal of the wall surface layer and creating a flush recess for hollow wall boxes, with the sinking particles being arranged radially outside the drill bit's contour and connected via soldering or welding for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If knurling or ground carbide balls are used on the edge countersinking element, then the wall surface can be effectively countersunk, but the edge countersinking element suffers material wear and thermal stress requiring regular replacement
Solution Approach 1:
The edge countersinking element is segmented into multiple individual sinking particles (e.g., 3-12 particles) arranged circumferentially on the edge of the core bit. Each particle can be independently replaced if worn, rather than replacing the entire edge countersinking element. This segmentation increases reliability by allowing partial replacement and extends service life through modular maintenance.
Solution Approach 2:
The sinking particles are made from materials with different properties than traditional knurls or carbide balls, including materials with higher melting points and better thermal stability. This parameter change in material composition reduces thermal stress damage and extends the service life of the edge countersinking element under high-temperature drilling conditions.
2Adaptability or versatility
If a single type of edge countersinking element is used, then the design is simple, but it is unsuitable for different types of walls leading to surface damage
Solution Approach 1:
The edge countersinking element is designed with multiple sinking particles made from different materials (e.g., carbide, ceramic, diamond-coated) that can effectively countersink various wall types including plasterboard, gypsum fiberboard, chipboard, and wooden walls. This multi-material approach provides universality, allowing a single edge countersinking element design to handle diverse wall materials without causing surface damage, while maintaining relatively simple overall structure.
3Ease of manufacture
If individual carbide balls are welded onto the edge at a distance from one another, then the manufacturing is simple, but the material removal causes excessive wear and thermal stress
Solution Approach 1:
The sinking particles are arranged with optimized spacing and sizing to create localized cutting zones that efficiently remove material with minimal waste. The particles are positioned to work in sequence, with each particle removing material in a controlled manner. This local quality optimization reduces excessive material removal while maintaining ease of manufacture through standardized particle attachment procedures.
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 increased durability and versatility, allowing the attachment to effectively work on various types of walls without losing effectiveness even when worn, as long as remaining sinking particles are present, and reduces the need for frequent replacement.
Implementation Method 1
The at least one countersinking body serves to remove an uppermost layer of the wall around the recess in the wall
Implementation Method 2
due to the material removal on the knurls or on the hard metal balls during the drilling or milling process
Implementation Method 3
the sinking particles being arranged radially outside the drill bit's contour and connected via soldering or welding for enhanced durability
Implementation Method 4
the sinking particles being arranged radially outside the drill bit's contour and connected via soldering or welding for enhanced durability
Implementation Method 5
The cutting edge preferably has a plurality of circumferentially arranged cutting teeth
Implementation Method 6
A cutting edge is arranged at the distal end of the tubular sidewall. The cutting edge preferably has a plurality of circumferentially arranged cutting teeth
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a core drill attachment (1) for producing recesses in a wall for the installation of cavity wall boxes and a method for producing a core drill attachment (1). The core drill attachment (1) comprises a drill bit (2) with a tubular side wall (3) which extends axially along an axis of rotation (RA) of the drill bit (2) from a proximal end (4) to a distal end (5) of the tubular side wall (3) and includes at least one countersinking element (7) arranged in the region of the proximal end (4) of the tubular side wall (3). The at least one countersinking element (7) comprises a base element and at least one countersinking body (9) arranged on the base element, wherein the at least one countersinking body (9) is arranged at least partially in a radial direction outside a contour of the tubular side wall (3) and serves to remove an uppermost layer of the wall around the recess in the wall.The at least one sinking body (10) is formed by several sinking particles (9).