Dual-Eccentric Orbital Drilling for Precise Hole Path Control
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Solution Overview
Problem
Existing orbital drilling devices face issues with imprecise radial offset adjustment, require manual operation, and have bulky designs, limiting their ability to perform diverse drilling shapes and dimensions without being coupled to a machine tool.
Innovation Solution
An orbital drilling device with a compact design featuring a motor, cutting tool, and dual eccentrics that allow for continuous and simultaneous rotation, enabling precise adjustment of the orbital path through control means, allowing for various drilling shapes and dimensions without external machine tool support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment of radial offset is used, then device structure is simple, but adjustment precision deteriorates
Solution Approach 1:
The patent replaces the manual mechanical adjustment system with an automated electromechanical system. An electric motor drives a lead screw mechanism that precisely controls the radial offset between the cutting tool axis and the orbital rotation axis. This substitution of manual operation with an automated motorized system resolves the contradiction by achieving high adjustment precision while maintaining relatively simple device structure.
2Device complexity
If manual adjustment of radial offset is used, then device structure is simple, but operational time increases
Solution Approach 1:
The patent replaces manual adjustment operations with an automated electric motor-driven lead screw system. This allows rapid and precise adjustment of the radial offset without requiring operator intervention, thereby reducing operational time while keeping the overall device structure relatively simple.
Solution Approach 2:
The patent enables preliminary setup of drilling parameters by allowing quick adjustment of the radial offset before actual drilling operations begin. The motorized adjustment system can pre-position the cutting tool at the required offset distance, reducing setup time and enabling faster transition between different drilling configurations.
3Device complexity
If belt drive is used for eccentric body adjustment, then device structure is simple, but adjustment precision deteriorates due to belt stretching
Solution Approach 1:
The patent replaces the belt drive mechanism with a direct motor-to-lead-screw connection. The electric motor directly drives the lead screw that adjusts the radial offset, eliminating the belt transmission entirely. This substitution removes the source of precision loss (belt stretching) while maintaining a relatively simple device structure through direct drive architecture.
4Adaptability or versatility
If orbital drilling device is self-contained without machine tool coupling, then operational independence is improved, but device bulk increases
Solution Approach 1:
The patent merges the orbital rotation mechanism and the cutting tool rotation mechanism into a single integrated device. The electric motor serves dual functions: driving the lead screw for radial offset adjustment and driving the cutting tool rotation. The orbital motion is achieved through the interaction of the eccentric bodies without requiring external machine tool coupling. This merging of functions reduces device bulk while maintaining operational independence.
Data Source
AI summary
An orbital drilling device includes, on the same frame: a motor rotating a cutting tool on itself; a first, interior, eccentric, receiving the motor, mounted so as to be able to rotate; a second, exterior, eccentric, receiving the first eccentric, mounted so as to be able to rotate; a reference body, secured to the frame, receiving the second eccentric, mounted so as to be able to rotate; a first unit for driving the first eccentric; a second unit for driving the second eccentric, simultaneously with the rotation of the first eccentric; and a controller configured to reproduce any path of the cutting tool in the zone by continuous control of the angular offset between the first eccentric and the second eccentric.