Planetary Gear Workpiece Speeder for High-RPM Lathe Machining
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Solution Overview
Problem
Existing lathes, including CNC lathes, face limitations in achieving the necessary surface feet per minute (SFM) for machining small parts due to restrictions on spindle/chuck revolutions per minute (RPM), leading to instability and inability to maintain speeds above 10,000 RPM without destabilizing the machine.
Innovation Solution
A speeder device with a planetary gearset assembly, torque rod, and collet assembly that increases the rotational speed of a workpiece by utilizing a sun gear with a predetermined number of teeth and a ring gear with twice as many teeth, allowing the workpiece to rotate faster than the lathe or chuck, thereby enhancing the feed rate and surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the lathe spindle/chuck operates at high RPM (above 10,000 RPM) to achieve proper surface feet per minute for machining small parts, then the feed rate and surface finish improve, but the entire machine shakes and destabilizes due to imbalances in internal machine components
Solution Approach 1:
The system is divided into two independent rotational systems: the lathe spindle/chuck rotating at stable low speed, and the workpiece rotating at high speed via the speeder device. This segmentation allows each component to operate at its optimal speed without destabilizing the other, resolving the contradiction between high workpiece speed and lathe stability.
Solution Approach 2:
The speeder device acts as an intermediary mechanism between the lathe spindle and the workpiece. It transfers rotational motion from the stable lathe spindle to the workpiece, multiplying the speed while isolating the workpiece rotation from the lathe structure, thus enabling high RPM operation without machine instability.
2Stability of the object's composition
If the lathe operates at low RPM to maintain stability, then the machine remains stable, but the surface feet per minute is insufficient for achieving clean surface finish and efficient cutting of small parts
Solution Approach 1:
By separating the lathe's stable rotation from the workpiece's high-speed rotation through the speeder device, the system achieves both stability and high productivity simultaneously. The lathe maintains stable operation while the workpiece rotates at speeds necessary for efficient machining and clean surface finish.
Solution Approach 2:
The speeder device serves as a mediator that enables the workpiece to rotate at high speeds required for productivity and surface finish quality, while the lathe itself operates at stable low speeds. This intermediary mechanism decouples the productivity requirement from the stability constraint.
3Stability of the object's composition
If existing lathes operate at maximum RPM (around 4,500 RPM) to avoid instability, then the machine remains stable, but the tools cannot cut at their most efficient and effective rate
Solution Approach 1:
The system segments the rotation into two independent systems: the stable lathe spindle and the high-speed workpiece. This allows tools to cut at efficient high speeds without causing machine instability, thereby reducing production time while maintaining stability.
Solution Approach 2:
The speeder device acts as an intermediary that enables tools to operate at their most efficient cutting speeds by rotating the workpiece at high RPM, while the lathe itself operates at stable speeds. This eliminates the time loss associated with operating at reduced speeds for stability.
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 speeder device effectively increases the rotational speed of the workpiece, reducing production time, improving surface finish quality, and extending tool life by allowing operation at higher RPMs without destabilizing the lathe, enabling efficient cutting of small parts.
Implementation Method 1
The planetary gearset assembly includes a plurality of planet gears, a sun gear, and a ring gear. The sun gear has a predetermined number (N) of teeth, wherein N is an integer between 8 and 50, and the ring gear has at least two times the number (2×N) of teeth of the sun gear.
Data Source
AI summary
The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.