Rotary Drum Quill Spindle Layout for Rigid Tool Positioning
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Solution Overview
Problem
Existing machine tools, such as horizontal machining centers, face challenges in securing rigidity and positioning accuracy due to the use of arm-like spindle brackets that transmit thrust and change weight balance, leading to increased size and reduced precision.
Innovation Solution
A machine tool design incorporating a movable drum base with a circular drum and a quill main spindle, where the drum is rotatable and supported by a bearing, allowing for adjustable protrusion and eliminating the need for radial mechanisms, thereby enhancing rigidity and positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an arm-like spindle bracket is used to support the main spindle, then the structure can be compact, but the rigidity deteriorates because thrust is transmitted through the bracket
Solution Approach 1:
The patent extracts the thrust-bearing function from the arm-like spindle bracket by introducing a dedicated bearing mechanism. The bearing is provided along the outer circumference of the drum to receive the thrust load of the quill main spindle, separating the positioning function (arm bracket) from the load-bearing function (bearing), thereby maintaining both compactness and rigidity
Solution Approach 2:
The patent introduces a bearing as an intermediary element between the drum and the quill main spindle. This bearing acts as a mediator that specifically handles the thrust load, allowing the arm-like spindle bracket to focus on positioning while the bearing ensures rigidity through dedicated load reception
2Device complexity
If an arm-like spindle bracket is used without weight balance regulation, then the structure is simpler, but positioning accuracy deteriorates due to changing weight balance
Solution Approach 1:
The patent extracts the weight balance regulation function from the spindle bracket structure by providing a separate regulating mechanism. The position of the spindle bracket can be regulated independently to maintain proper weight balance, keeping the bracket structure simple while ensuring positioning accuracy
Solution Approach 2:
The patent applies parameter changes by allowing the position of the spindle bracket to be adjusted. This regulation of the bracket's position compensates for changing weight balance during rotation, maintaining positioning accuracy without complicating the overall structure
3Manufacturing precision
If the drum diameter is increased to improve positioning, then the structure becomes more robust, but the depth dimension increases requiring reinforcement
Solution Approach 1:
The patent extracts the thrust load reception function from the drum structure by providing a dedicated bearing along the outer circumference. This allows the drum to be optimized for positioning accuracy without needing reinforcement for thrust loads, maintaining compact depth dimensions even with larger drum diameter
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 design achieves space-saving, improved accessibility, and vibration absorbability, maintaining rigidity and precision even with increased drum diameter, without requiring additional reinforcement or intricate covers, ensuring accurate cutting and reduced stress paths.
Implementation Method 1
a bearing provided along an outer circumference of the drum is interposed between the drum base and the drum such that the drum is rotatable in the drum base
Data Source
AI summary
Provided is a machine tool including: a movable drum base (4); a drum (5) that is incorporated in the drum base (4) and is circular in outline; and a quill main spindle (6) penetrating through the drum (5) in a central axis direction of the drum (5), wherein protrusion allowance from the drum (5) is adjustable, wherein a bearing provided along an outer circumference of the drum (5) is interposed between the drum base (4) and the drum (5) such that the drum (5) is rotatable in the drum base (4), and movement of the drum base (4), rotation of the drum (5), and protrusion allowance adjustment of the quill main spindle (6) from the drum (5) allow a tool (10) mounted on the quill main spindle (6) to be positioned.