Adjustable Spindle Tool Radius via Dual Draw-Bar Mechanism
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Solution Overview
Problem
Traditional spindle apparatuses are inflexible and inefficient when dealing with workpieces that require machining of irregular shapes with varying radii, as they can only accommodate tools with predetermined diameters, leading to frequent tool replacements and reduced workability.
Innovation Solution
The spindle apparatus includes a housing with a rotatable spindle, a tool with radial and axial passages, and draw-bars that allow the insert tip to move radially, enabling adjustment of the tool radius through a system of draw-bars, clamps, and an actuator, allowing the tool to be engaged or disengaged from the spindle for varying machining processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional spindle apparatus uses tools with predetermined diameters, then the tool structure is simple and easy to manufacture, but the adaptability to different machining processes is poor
Solution Approach 1:
The tool is designed with a movable insert tip that can adjust its position along the radial direction of the tool. The adjustment member moves along the axial direction within the second passage, driving the insert tip to change the tool radius dynamically. This dynamic adjustment capability allows the same tool to adapt to different machining processes with varying radius requirements.
Solution Approach 2:
The tool is segmented into multiple functional components: the tool body with passages, the movable insert tip, and the adjustment member. This segmentation allows independent adjustment of the insert tip position while maintaining the overall tool structure, enabling versatility without requiring complete tool replacement.
2Productivity
If traditional spindle apparatuses use fixed radius tools, then the tool manufacturing is simple, but the productivity is reduced due to frequent tool changes
Solution Approach 1:
The adjustable insert tip mechanism allows the tool radius to be changed during operation without replacing the entire tool. The adjustment member can be moved along the axial passage to reposition the insert tip, enabling continuous machining operations with varying radius requirements and eliminating tool change downtime.
3Ease of operation
If the tool radius is fixed, then the tool structure is simple and reliable, but the ease of operation is reduced for varying machining processes
Solution Approach 1:
The draw-bar mechanism provides a systematic way to adjust the tool radius. The first draw-bar moves the tool along the radial direction, while the second draw-bar moves the adjustment member along the axial direction. This coordinated dynamic adjustment system makes it easy to change the tool radius for different machining operations.
Solution Approach 2:
The adjustment member acts as an intermediary between the second draw-bar and the insert tip. It translates the axial movement from the second draw-bar into radial movement of the insert tip, providing a mechanical advantage and making the adjustment process easier to control.
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 design allows for flexible adaptation to composite machining processes by varying the tool radius, enhancing workability and reducing the need for frequent tool changes, particularly in operations like boring engine cylinders or valve seats.
Implementation Method 1
The insert tip may have a first inclined surface, and the adjustment member may have a second inclined surface making contact with the first inclined surface
Data Source
AI summary
A spindle apparatus according to the present disclosure includes a housing, a spindle rotatably installed in the housing, a tool releasably engaged with one end of the spindle and having an insert tip movable in a radial direction of the tool, a first draw-bar movably mounted in the spindle, and a second draw-bar movably mounted in the first draw-bar. The tool and one end of the first draw-bar are releasably engaged with the one end of the spindle by a movement of the first draw-bar, and the insert tip is configured to move in the radial direction by a movement of the second draw-bar.