Milling and Boring Tool with Oppositely Twisted Chip Grooves
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Solution Overview
Problem
Milling and boring tools used in orbital drilling face challenges such as long machining times and difficulty in achieving narrow drilling tolerances due to deflection, leading to high production costs.
Innovation Solution
The tool features oppositely twisted chip grooves on rough-machining and finishing cutters, providing a positive axial rake angle during both processes, which reduces deflection and cutting forces, allowing for precise machining and shorter times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional orbital drilling is used, then different drilling diameters can be produced with one tool, but machining times are long and narrow drilling tolerances are difficult to achieve
Solution Approach 1:
The tool is segmented into multiple cutters (rough-machining cutters and finishing cutters) with different functions arranged axially. Rough cutters perform material removal while finishing cutters achieve precise dimensional accuracy and surface quality, allowing high productivity with narrow tolerances while maintaining versatility through the same multi-cutter tool structure
Solution Approach 2:
Rough-machining cutters perform preliminary material removal before finishing cutters operate. This preliminary action removes the bulk material quickly, enabling the subsequent finishing cutters to work on a pre-prepared surface, thereby reducing total machining time while achieving narrow tolerances in the final finishing pass
2Adaptability or versatility
If traditional orbital drilling is used, then one tool can produce different drilling diameters, but deflection is large requiring small advances
Solution Approach 1:
The tool separates rough-machining and finishing functions into distinct cutters positioned at different axial locations. This segmentation allows rough cutters to handle larger material removal with appropriate advances, while finishing cutters operate on pre-prepared surfaces to achieve narrow tolerances, eliminating the need to compromise between deflection and precision
Solution Approach 2:
Rough cutters perform preliminary material removal to create a prepared surface before finishing cutters operate. This preliminary action reduces the amount of material the finishing cutters must remove, minimizing deflection during precision machining while maintaining the ability to produce different drilling diameters
3Manufacturing precision
If small diameter milling and boring tools are used, then precision can be achieved, but deflection is large leading to very long machining times
Solution Approach 1:
The tool segments rough-machining and finishing operations into separate cutters. Small diameter finishing cutters achieve precision on pre-prepared surfaces, while larger rough cutters remove material quickly beforehand, eliminating the trade-off between precision and machining time by performing different functions at different stages
4Device complexity
If conventional chip groove design is used, then tool structure is simple, but cutting forces are large and chip flow is poor
Solution Approach 1:
Different chip groove designs are applied to different cutters based on their specific functions. Rough-machining cutters have chip grooves optimized for heavy chip removal with larger cutting forces, while finishing cutters have chip grooves designed for precise chip evacuation with minimal cutting forces, optimizing performance for each local function rather than using a uniform design
Data Source
AI summary
A milling and boring tool with a tool shaft which comprises a center axis, at least one geometrically defined rough cutter and at least one geometrically defined finishing cutter, and the at least one rough cutter and the at least one finishing cutter respectively comprise a chip groove. The milling and boring tool is characterized in that the chip groove of the at least one finish machining cutter has an opposite twist than the chip groove of the at least one rough cutter.