Telescopic Bar Feeding Drum for Lathe Vibration Control
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Solution Overview
Problem
Existing apparatuses for feeding bars to machine tools suffer from significant vibrational phenomena, flexure effects due to centrifugal forces, and high friction, leading to compromised machining precision, structural complexity, and costly maintenance.
Innovation Solution
A compact apparatus with a rotatable drum and telescopic tubular supporting means that eliminate flexure and vibration by distributing the bar's weight evenly and reducing friction through precise guidance and support, using a simplified structural configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a drum with multiple openable guides and bar-pushing members is used to feed bars to the lathe, then automatic bar feeding is achieved, but significant vibrational phenomena and flexure effects occur due to bar rotation
Solution Approach 1:
The drum is divided into multiple sectors, each sector containing a complete set of guiding members and bar-pushing members that operate independently. This segmentation allows each sector to handle one bar at a time, reducing the overall vibration and flexure effects by distributing the rotational mass and operational forces across multiple smaller, independent units rather than one large complex system
Solution Approach 2:
The guiding members are designed to be movable rather than fixed, allowing them to adapt their position dynamically during bar feeding and rotation. This dynamic adjustment capability reduces vibrations and flexure effects by optimizing the support configuration for each bar's specific position and operational phase
2Productivity
If the drum is extended in length with many members and openable guides mounted on it, then multiple bars can be fed simultaneously, but dynamic stress and vibrations increase imposing lower operating speeds
Solution Approach 1:
The drum is segmented into multiple independent sectors, each capable of operating autonomously to feed one bar. This segmentation allows the system to maintain high operating speeds because each sector's mass and rotational inertia are reduced, minimizing dynamic stress and vibrations that would otherwise limit the overall operating speed of a unified long drum
Solution Approach 2:
Multiple independent sectors are merged into a single drum structure that rotates together, enabling simultaneous feeding of multiple bars while maintaining the dynamic advantages of segmented design. The sectors share the rotational motion but operate independently in terms of bar handling and guiding member actuation
3Extent of automation
If numerous openable guides and bar-pushing members are mounted on the drum, then automatic bar feeding functionality is comprehensive, but the apparatus becomes structurally complex with high manufacturing cost
Solution Approach 1:
Each sector on the drum is designed as a universal module that can handle any bar type through standardized guiding members and bar-pushing members. This multi-functional design reduces overall structural complexity by using repeated standardized components rather than custom-designed elements for each bar position, simplifying manufacturing while maintaining comprehensive automatic feeding functionality
Solution Approach 2:
Instead of mounting guiding members and bar-pushing members on a fixed stationary structure, the invention inverts the approach by mounting these components on the rotating drum itself. This inversion simplifies the overall structure by eliminating the need for complex stationary mounting mechanisms and allows the guiding members to move with the drum, reducing friction and structural complexity
4Manufacturing precision
If fixed guiding members are used on the drum, then bar guidance is provided, but significant friction is generated between the bars and the supporting guides
Solution Approach 1:
The guiding members are designed to be movable rather than fixed, allowing them to dynamically adjust their position and orientation during bar feeding and rotation. This dynamic capability maintains precise bar guidance while significantly reducing friction by enabling the guiding members to follow the bar's motion naturally rather than forcing the bar against a fixed guide structure
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 apparatus achieves precise bar guidance and support, reducing vibrations and maintenance needs, enhancing machining quality and reducing downtime and manufacturing costs.
Implementation Method 1
the flexure phenomena the bars encounter through the centrifugal effect that is due to the rotation thereof
Implementation Method 2
a significant reduction of moving masses during operation is achieved, so there is a consequent conspicuous reduction of undesired vibrations
Data Source
AI summary
An apparatus for feeding bars to a machine tool including an end adjacent a working zone in which a spindle is provided; a drum element, rotatable around an axis; a movable support provided on the drum element for supporting and guiding a bar parallel to the axis. The movable support slidably drivable on the drum element parallel to the axis between a disengagement retracted configuration and an engagement extended configuration. The movable support having telescopic tube configured for being received inside tubular housing and guide for coupling with the spindle. The telescopic tube defines, a cylindrical containing structure configured for enclosing and supporting in a distributed manner a respective bar along the entire supporting zone, so as to prevent the bar from flexing because of the centrifugal actions generated by rotation.