Flat Center Drill Segmented from Holding Tool
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Solution Overview
Problem
Conventional center drills made of High Speed Steel are inefficient at high speeds, requiring longer processing times and higher costs, while Tungsten Carbide drills are cost-prohibitive due to excessive material usage in the shank, which contributes most of the expense.
Innovation Solution
A flat center drill design that can be easily and precisely connected to a drill holding tool with a recessed shaft, utilizing a threaded hole and positioning pieces to securely engage the drill, allowing for efficient material use and high-speed operation with Tungsten Carbide without excessive material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional cylindrical shank center drill is made of Tungsten Carbide to enable high-speed drilling, then drilling speed increases 5-20 times faster than HSS, but the cost increases 10 times due to excessive material usage in the shank
Solution Approach 1:
The center drill is divided into two separate components: a flat drill body made of expensive Tungsten Carbide for high-speed cutting, and a separate holding tool with a recess that receives the drill. This segmentation allows the expensive material to be used only where necessary (the cutting portion) rather than throughout the entire tool length, resolving the contradiction between high-speed capability and material cost.
Solution Approach 2:
The invention transitions from a conventional cylindrical shank design to a flat drill design that can be precisely connected to the holding tool. This dimensional change from cylindrical to flat geometry enables more efficient material usage while maintaining the structural integrity needed for high-speed operation with Tungsten Carbide.
2Quantity of substance
If a conventional cylindrical shank center drill is made of High Speed Steel to reduce material cost, then material cost decreases, but drilling speed is slow requiring longer processing time
Solution Approach 1:
By segmenting the center drill into a cutting portion and a holding portion, the invention enables the use of expensive Tungsten Carbide only in the cutting area where high-speed performance is critical, while the holding tool can be made of less expensive materials. This resolves the contradiction by allowing high-speed drilling capability without requiring the entire tool to be made of expensive material.
3Ease of manufacture
If a cylindrical shank design is used for the center drill, then the drill can be easily connected to the chuck, but most of the expensive Tungsten Carbide material is wasted in the shank portion which has no cutting function
Solution Approach 1:
The invention separates the cutting function from the holding function into distinct components. The flat drill body contains the expensive Tungsten Carbide material only where cutting occurs, while the separate holding tool provides the connection interface. This eliminates material waste in the shank area while maintaining easy connection capability through the designed recess and positioning mechanism.
Solution Approach 2:
The invention extracts the holding function from the drill body itself and places it in a separate holding tool. This allows the expensive Tungsten Carbide material to be concentrated solely in the cutting portion of the flat drill, removing the unnecessary material usage in what would traditionally be the shank area, while the holding tool provides the connection capability.
Data Source
AI summary
A drill holding tool includes a shaft and a drill-holding portion which has a recess defined axially in an outer periphery thereof so as to receive a flat center drill therein which has one end protrudes out from the distal end of the drill-holding portion. The recess is defined by two sidewalls and a bottom surface, and a threaded hole is defined through the bottom surface. Two semi-circular reception holes are defined in two insides of the two sidewalls and two positioning pieces are received in the reception holes. The center drill includes a positioning hole corresponding to the threaded hole in the recess and two semi-circular positioning notches in which the two positioning pieces are partially received. The center drill is a flat piece which saves material required and the positioning notches allow the center drill to be quickly and precisely positioned.