Alloy Tool Bit Twist Drill Structure for Stable, Cooler Drilling
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Solution Overview
Problem
Existing drilling tools experience structural imbalances leading to damage, low efficiency, and reduced drilling precision due to the single co-located cutting edge structure, which is prone to damage under dual forces, and the assumption that smoother surfaces equate to higher strength overlooks the structural characteristics of the material.
Innovation Solution
A twist drill with an alloy tool bit featuring multiple spiral tool bodies with alloy tool bits, including central stepped platforms, branch hole tables, and micro-strengthening features, enhancing stability and heat dissipation, and incorporating cooling holes for improved drilling efficiency and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single co-located cutting edge structure is used, then the tool structure is simple, but the cutting edge is prone to damage under dual forces (rotary cutting force and centrally outward conduction force)
Solution Approach 1:
The single cutting edge is segmented into multiple cutting edges (first cutting edge and second cutting edge) that are spatially separated. This segmentation allows each cutting edge to handle specific force components independently, preventing the concentration of dual forces on a single edge and thereby improving durability while maintaining structural simplicity.
2Device complexity
If the tool is stabilized only through the spiral cutting surface, then the structure is simple, but the tool swings due to structural imbalance during drilling
Solution Approach 1:
A counterweight structure is introduced to balance the spiral cutting surface. The counterweight is positioned to offset the centrifugal forces generated during rotation, creating a balanced tool structure that eliminates swinging and instability while maintaining overall structural simplicity.
3Device complexity
If the cutting edge is in the centrifugal force conduction range, then the structure is simple, but the cutting edge is subjected to both rotary cutting force and centrally outward conduction force simultaneously causing damage
Solution Approach 1:
The force conduction paths are separated into different spatial dimensions. The first cutting edge handles forces in one dimensional plane while the second cutting edge handles forces in another plane, effectively distributing the dual forces across different dimensions and preventing concentration that would compromise strength.
4Manufacturing precision
If the surface is made smoother, then the surface strength is perceived to be higher, but the essential structural characteristics are not revealed leading to low efficiency
Solution Approach 1:
Instead of uniformly smoothing the entire surface, local quality variations are introduced through specific surface treatments on different portions of the tool. Certain areas maintain higher roughness to enhance friction and material removal, while other areas are smoothed for reduced friction, creating an optimized balance between surface characteristics and drilling efficiency.
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 alloy tool bit twist drill achieves a 40% increase in rotating speed and feed amount, resulting in a tenfold increase in drilling holes, improved stability, and extended service life compared to conventional tools.
Implementation Method 1
cooling holes for improved drilling efficiency and precision
Data Source
Figure 1
Figure 2
AI summary
An alloy tool bit twist drill, comprising a tool shank, a spiral tool body (4) and an alloy tool bit (31). A groove is milled on a spiral cutting surface (13) of the spiral tool body, the alloy tool bit (31) is integrally arranged on the spiral cutting surface, the spiral cutting surface (13) and a cutting surface of the alloy tool bit (31) are arranged in the same groove, and a central stepped platform (10) is arranged on the cutting surface near the axis center of the alloy tool bit (31). A central stepped surface (12) is arranged on the inner side of the central stepped platform (10) protruding in the rotating direction; or a branch hole table (23) and a branch cutting surface (24) are concavely arranged on the cutting surface of the alloy tool bit (31) in a stepwise manner in the direction from the axis center to the outer periphery; or a micro cutting surface (18) is concavely formed on the cutting surface of the alloy tool bit (31) from a spiral cutting edge (17) toward the axial center direction, and a micro-strengthening stress extension table (20) is formed on the inner side of the micro cutting surface (18) in a standing mode. The alloy tool bit twist drill has such advantages as high stability, efficient heat dissipation, long service life and easy positioning in drilling.