Rotary Guide-Bush Spindle Assembly for Slender Workpiece Support
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Solution Overview
Problem
Existing spindle apparatuses for machine tools, such as lathes, require complex and large-sized driving mechanisms for driven rotary guide-bushes to support lengthy and slender workpieces, which are not cost-effective or compact.
Innovation Solution
A spindle apparatus with a driven rotary guide-bush featuring a torque transferring connection using a rotationally supported transfer shaft and driving belts, and an optional external drive motor, allows for synchronized rotation with the spindle shaft, enabling movement of the workpiece in the Z-direction while maintaining compactness and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driven rotary guide-bush is used to support lengthy and slender workpieces, then the workpiece support function is improved, but the driving mechanism becomes complex and large-sized
Solution Approach 1:
The rotary guide-bush utilizes the rotation of the spindle shaft and workpiece to drive its own rotation through frictional contact, eliminating the need for an independent complex driving mechanism. The guide-bush rotates passively along with the workpiece while providing support functionality
Solution Approach 2:
The patent removes the complex independent driving mechanism from the system entirely, extracting only the essential support function of the guide-bush while relying on the existing spindle rotation to provide the necessary rotational motion
2Reliability
If a driven rotary guide-bush is used to support lengthy and slender workpieces, then the workpiece support function is improved, but the mechanism size increases
Solution Approach 1:
The patent extracts and eliminates the bulky independent driving mechanism, retaining only the essential guide-bush component that provides support functionality while minimizing overall mechanism volume
Solution Approach 2:
The guide-bush serves itself by utilizing the existing rotational motion from the spindle and workpiece, eliminating the need for additional motors or drive systems that would increase mechanism size
3Reliability
If a driven rotary guide-bush is used to support lengthy and slender workpieces, then the workpiece support function is improved, but the cost increases
Solution Approach 1:
The guide-bush system uses the existing rotational energy from the spindle and workpiece without requiring additional motors or complex control systems, significantly reducing manufacturing costs while maintaining support functionality
Solution Approach 2:
By removing the independent driving mechanism, the patent eliminates expensive components such as motors, gears, and control systems, leaving only the simple guide-bush structure that provides the necessary support function at lower cost
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 solution provides a cost-effective, efficient, and compact mechanism for supporting lengthy and slender workpieces by synchronizing the rotation of the rotary guide-bush with the spindle shaft, allowing for Z-direction movement without the need for additional complex driving mechanisms.
Implementation Method 1
driving belts
Data Source
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AI summary
The present disclosure relates to a spindle apparatus for use at a machine tool, in particular a lathe, comprising: a spindle assembly 100 including a workpiece spindle being configured to receive an elongated workpiece B and a spindle motor 120 for driving a spindle rotation of the workpiece spindle about a spindle axis of the workpiece spindle; and a rotary guide-bush assembly 200/200A being axially arranged with the workpiece spindle with respect to the spindle axis, the rotary guide-bush assembly including a rotary guide-bush configured to receive the elongated workpiece B and being supported at the rotary guide-bush assembly to rotate with the elongated workpiece B received in the workpiece spindle about the spindle axis while enabling a movement of the elongated workpiece in the direction of the spindle axis; characterized in that the rotary guide-bush assembly includes a clamping portion 210A configured to clamp the elongated workpiece, which is received in the rotary guide-bush and in the workpiece spindle, so as to transfer a driving torque applied from the spindle motor during a driven acceleration of the rotation of the workpiece spindle through the clamped elongated workpiece B for driving a rotation of the rotary guide-bush synchronized with the driven acceleration of the rotation of the workpiece spindle.