Drill Bit Flute Back Slope and Multi-Step Grinding
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Solution Overview
Problem
Conventional drill bit manufacturing methods are inefficient, particularly in simplifying the process and reducing material accumulation that leads to increased friction and potential tool failure.
Innovation Solution
A three-step method where a round rod is clamped, a chip flute is ground, and then the drill bit is ground down to the desired dimensions simultaneously with the drill-bit back, eliminating the need for separate steps and guide lands, allowing for a single grinding disc setup and reduced friction by sloping the flute back for better cooling and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to manufacture drill bits with separate steps for grinding chip flutes, outer diameter, and flute back, then manufacturing precision is maintained, but productivity is reduced due to multiple sequential operations
Solution Approach 1:
The patent combines multiple grinding operations (chip flute grinding, outer diameter grinding, and flute back grinding) into a single integrated process using one grinding disc. The grinding disc is configured with specific angles and positions to simultaneously perform all three operations in one setup, eliminating sequential processing steps and reducing total machining time while maintaining manufacturing precision.
Solution Approach 2:
The grinding disc is designed as a multi-functional tool that can perform multiple grinding operations. By configuring the grinding disc with specific geometric parameters (setting angle corresponding to twist angle, transverse positioning), a single disc serves the functions of creating chip flutes, reducing outer diameter, and forming the flute back, thereby improving productivity without requiring multiple specialized grinding tools.
2Reliability
If guide lands are produced on the flute back by leaving material during grinding, then structural support is provided, but material accumulation occurs leading to increased friction and potential tool failure
Solution Approach 1:
Instead of creating guide lands by leaving material on the flute back (conventional approach), the patent inverts the approach by completely removing material to create a groove-free flute back surface. The grinding disc is positioned and configured to grind the entire flute back area, eliminating the guide lands that cause material accumulation and friction, thereby improving tool reliability through reduced harmful effects.
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 method significantly reduces machining time, prevents material jamming, and enhances cooling and lubrication properties, leading to improved drill bit performance and reduced risk of tool failure.
Implementation Method 1
a chip flute is ground into the round rod in the first method step... In the second method step, the grinding disc grinds the round bar to the desired dimensions
Implementation Method 2
the flute back in each case slopes downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continually larger
Data Source
AI summary
A method for manufacturing a drill bit (1), wherein in a first step the chip flutes (12) are ground into a round rod, in a second step the round rod is ground down to its outer diameter (15, 16) with simultaneous grinding of the drill-bit back (13), and wherein in a third step the drill-bit front (4) is ground, and a drill bit (1) having at least one chip flute (12) and one secondary cutting edge and one drill-bit back (13) adjoining the secondary cutting edge, the drill-bit back (13) sloping downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continuously larger as the distance from the point of intersection (19) of the secondary cutting edge with the drill-bit back (13) increases.