Solid Carbide Drill with Integrated Knife Window
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Solution Overview
Problem
Existing drilling and chamfering tools face instability and wear issues with small diameters, particularly less than 5 mm, due to unfavorable axial distances and material mismatches between drill bits and chamfering blades, leading to deflection, high torque transmission problems, and premature wear.
Innovation Solution
A solid carbide drill with an integrated drill shank and knife window, where the knife window is arranged transversely within the drill shank, utilizing a spring-loaded axial pin for swivel drive and a cylindrical compression spring, allowing for miniaturization and enhanced torque transmission without the need for space-consuming mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a threaded connection is used to attach the drill bit to the base body, then the drill bit can be securely mounted, but an unused axial length (adaptation length) is created behind the drill helix, leading to instability and deflection especially for small diameters
Solution Approach 1:
The drill bit and base body are merged into a single integral carbide structure, eliminating the threaded connection and associated adaptation length. The chamfering cutter is directly integrated into the drill shank, creating a compact tool with no unnecessary axial gaps, thereby improving stability and torque transmission for small diameters.
Solution Approach 2:
The entire tool including drill bit, drill shank, and chamfering cutter is made from solid carbide material, providing high strength and stiffness while enabling direct integration without threaded connections. This composite carbide structure eliminates the adaptation length problem while maintaining secure mounting and torque transmission capabilities.
2Ease of manufacture
If the base body is made of unhardened steel material, then the structure remains flexible and manufacturable, but the base body cannot be diamond-coated and has a short service life due to premature wear
Solution Approach 1:
The entire tool is manufactured from solid carbide material, which can be diamond-coated to provide both high wear resistance and extended service life. The carbide material maintains sufficient manufacturability while enabling protective coating application, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The material hardness parameter is changed from unhardened steel to hardened carbide material. This parameter change enables diamond coating application and dramatically increases wear resistance and service life, while the carbide material remains manufacturable through standard carbide fabrication processes.
3Adaptability or versatility
If a spring-loaded displaceable chamfering knife is used in a transverse cutter window, then both front and back bore edges can be chamfered, but chip removal leads to premature wear in the cutter window and rotary bearing areas
Solution Approach 1:
The cutter window and rotary bearing areas are made from solid carbide material and diamond-coated, providing high wear resistance against chip removal. This allows the spring-loaded displaceable chamfering knife design to maintain its versatility for chamfering both bore edges without suffering from premature wear in the cutter window and bearing areas.
Solution Approach 2:
The material hardness and wear resistance parameters of the cutter window and rotary bearing areas are improved by using diamond-coated carbide material. This parameter change enables the cutter window to withstand chip removal forces without premature wear, maintaining the reliability of the versatile chamfering capability.
4Ease of operation
If the axial distance between the drill helix and chamfering cutter is increased to allow for threaded connection, then the drill bit can be mounted, but the tool becomes prone to deflection and unstable for small diameters less than 5 mm
Solution Approach 1:
The drill bit mounting and chamfering cutter support functions are merged into a single integral carbide structure. The direct integration eliminates the axial gap between drill helix and chamfering cutter, providing tool stability for small diameters while maintaining ease of operation through the unified structure.
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 provides stable guidance and wear resistance for small diameters, eliminating the need for adaptation lengths, reducing vibrations, and enabling efficient torque transmission, thus enhancing the tool's resilience and longevity.
Implementation Method 1
a cylindrical compression spring (6) acting on a pin (5)
Implementation Method 2
The drill tip (1) together with a drill shank (35) integrally formed with it forms a drill body (13) made of solid carbide material
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Drill-chamfer combination tool (13, 21) for producing bores (29) in a workpiece (28) and subsequently applying a chamfer (30) to at least one bore edge of the bore (29), comprising a drill tip (1) which is rotationally fixed in a base body (3), and at least one chamfering knife (4) arranged axially behind the drill tip (1), which is spring-loaded and displaceable transversely to the longitudinal axis of the combination tool (13, 21) in a knife window (25) arranged in the drill shank (35), wherein the drill body (13) consisting of the drill tip (1) and the drill shank (35) is made of a solid carbide material, and wherein a spring-loaded, displaceable control pin (5) is arranged in a central longitudinal bore (36) of the solid carbide drill, the front tip (15) of which controls the transverse displacement of the cutter in the knife window (25). controls the movable barrel knife (4).