Rotary Guide-Bush Spindle Coupling 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 transfer shaft and driving belts, and optionally an external drive motor, allows for synchronized rotation with the spindle while enabling Z-direction movement of the workpiece, eliminating the need for additional complex driving mechanisms.
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 patent extracts the essential function of torque transfer from the complex driven rotary guide-bush system and implements it through a simpler connection between the spindle and rotary guide-bush. The spindle directly transfers torque to the rotary guide-bush during acceleration phases, eliminating the need for complex additional driving mechanisms while maintaining reliable workpiece support.
Solution Approach 2:
The spindle serves multiple functions: it not only rotates the workpiece during machining but also acts as a driving mechanism for the rotary guide-bush during acceleration and deceleration phases. This multi-functionality eliminates the need for separate complex driving mechanisms, reducing device complexity while maintaining reliability.
2Ease of operation
If additional driving mechanisms are added to rotate the rotary guide-bush, then the rotation control is improved, but the device size and cost increase
Solution Approach 1:
The patent merges the rotation control function into the existing spindle operation. During acceleration and deceleration, the spindle directly drives the rotary guide-bush through mechanical connection, combining the spindle's rotational motion with the guide-bush rotation control, thereby avoiding additional driving mechanisms and reducing device size.
Solution Approach 2:
The spindle automatically provides rotational drive to the rotary guide-bush during acceleration and deceleration phases without requiring external control mechanisms. The system uses its own existing motion to control the rotary guide-bush, eliminating the need for additional actuators and reducing overall device size.
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, allowing for Z-direction movement without the need for complex additional driving mechanisms.
Implementation Method 1
driving belts
Implementation Method 2
torque transferring connection
Data Source
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AI summary
The present disclosure relates to a spindle apparatus for use at a machine tool (600), 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) being axially arranged with the workpiece spindle with respect to the spindle axis, the rotary guide-bush assembly including a rotary guide-bush (210) configured to receive the elongated workpiece (B) and being supported at the rotary guide-bush assembly (200) to rotate with the elongated workpiece (B) received in the workpiece spindle about the spindle axis while enabling a movement of the elongated workpiece (B) in the direction of the spindle axis; wherein the spindle assembly (100) and the rotary guide-bush assembly (200) are configured to connect to each other by a torque transferring connection (700), preferably realized by a telescopic tube mechanism, arranged between the spindle assembly (100) and the rotary guide-bush assembly (200) along the spindle axis so as to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor (120) to the rotary guide-bush (210) of the rotary guide-bush assembly (200).