Dual-Motor Drilling Machine Epicyclic Transmission Feed Control
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Solution Overview
Problem
Existing controlled feed speed drilling machines manage feed speed in relation to both rotation frequencies of the driving and feed motors, complicating optimal control and increasing the risk of poor drilling outcomes and tool deterioration due to the interdependence of these frequencies.
Innovation Solution
The implementation of an epicyclic train transmission system that allows the feed speed of the output shaft to depend solely on the rotation frequency of the feed motor, decoupling it from the rotation frequency of the driving motor, ensuring reliable feed speed management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feed speed is managed in relation to both rotation frequencies of driving and feed motors, then drilling machine can achieve controlled feed speed, but control complexity increases and reliability decreases
Solution Approach 1:
The transmission system is segmented into two independent chains: a first transmission chain connecting the driving motor to the driving ring, and a second transmission chain connecting the feed motor to the drive nut. This segmentation allows each chain to be controlled independently, simplifying the control system while maintaining reliable feed speed management.
Solution Approach 2:
The epicyclic train acts as an intermediary mechanism between the two independent transmission chains. It receives rotational input from the driving ring through the first pinion and combines it with the rotational input from the drive nut through the second pinion to produce the output rotation of the output shaft. This intermediary structure enables independent control of rotation and feed speed while maintaining a simple control architecture.
2Ease of operation
If independent transmission chains are used for rotation and feed, then feed speed can be controlled, but the interdependence of motor frequencies complicates optimal control
Solution Approach 1:
The transmission system is divided into two completely independent transmission chains with no mechanical components in common. The first chain (driving motor → first pinion → driving ring) controls rotation, while the second chain (feed motor → second pinion → drive nut) controls feed speed. This segmentation makes feed speed management easier by allowing independent adjustment of each function.
Solution Approach 2:
The epicyclic train serves as a mediator that combines the outputs of two independent transmission chains. The driving ring and drive nut, which are controlled independently, both interact with the epicyclic train to produce the final output. This mediator structure allows independent control while managing the complexity through a well-defined mechanical relationship.
3Reliability
If feed speed depends on difference between motor frequencies, then controlled feed is achieved, but risk of poor drilling outcomes and tool deterioration increases
Solution Approach 1:
By segmenting the transmission into independent chains, each motor's frequency can be optimized for its specific function without compromising the other. The driving motor frequency optimizes rotation, while the feed motor frequency optimizes feed speed, reducing the risk of poor drilling outcomes caused by frequency interference.
Solution Approach 2:
The epicyclic train mediates between the two independent transmission chains in a way that ensures reliable drilling outcomes. The mathematical relationship in the epicyclic train (where output speed is a function of the difference between input speeds) naturally provides the controlled feed mechanism while maintaining reliability through its well-defined mechanical geometry.
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 configuration enhances the reliability of feed speed control, reducing the risk of poor drilling outcomes and tool deterioration by allowing independent management of feed speed based solely on the feed motor's rotation frequency.
Implementation Method 1
The transmission means are configured in such a way that the feed speed of the output shaft along its longitudinal axis is equal to the product of the rotation frequency of the second motor and a constant
Data Source
AI summary
A controlled feed speed drilling machine includes an output shaft for driving a cutting tool in motion. The output shaft is connected to first and second motors by a transmission, which includes a rotationally driving ring and a tapped drive nut. The driving ring is rotatable along the longitudinal axis of the output shaft via the transmission and the first motor. The output shaft is rotationally linked to the driving ring and is mobile in translation relative to the driving ring along the longitudinal axis via the transmission and the second motor. The tapped drive nut rotates along the longitudinal axis relative to the output shaft via the transmission and the first motor. The translation speed VT of the output shaft along its longitudinal axis is equal to the product of the rotation frequency FR of the second motor and a constant k according to VT=k. FR.