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 costly and not compact.
Innovation Solution
A spindle apparatus with a torque transferring connection, specifically a telescopic coupling tube mechanism and a rotary guide-bush assembly, allows for synchronized rotation and axial movement of workpieces, using a compact and cost-effective design that includes a clamping mechanism with adjustable pressure levels and freewheels for efficient torque transfer.
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 capability is improved, but the device complexity and size increase due to complex driving mechanisms
Solution Approach 1:
The patent extracts the driving mechanism from the rotary guide-bush assembly, allowing the guide-bush to rotate passively through torque transfer from the workpiece itself during spindle acceleration and deceleration. This eliminates complex driving mechanisms while maintaining workpiece support capability, directly resolving the technical contradiction between reliability improvement and device complexity reduction.
2Reliability
If a driven rotary guide-bush is used to support lengthy and slender workpieces, then the workpiece support capability is improved, but the device size increases due to large-sized driving mechanisms
Solution Approach 1:
By removing the driving mechanism from the guide-bush assembly and relying on passive torque transfer through the workpiece, the patent significantly reduces the volume of the guide-bush assembly. The passive rotation system requires no additional motors, gearboxes, or drive shafts, directly addressing the contradiction between improved workpiece support and reduced assembly size.
3Device complexity
If a passive rotary guide-bush is used, then the device complexity is reduced, but the torque transfer capability during acceleration and deceleration is insufficient
Solution Approach 1:
The patent employs a clamping mechanism that rigidly connects the guide-bush to the workpiece before spindle acceleration or deceleration begins. This preliminary clamping action ensures that torque is effectively transferred from the workpiece to the guide-bush during dynamic phases, resolving the contradiction between device simplicity and torque transfer capability by preparing the system in advance.
Solution Approach 2:
The clamping mechanism dynamically adjusts its engagement state, being rigidly connected during acceleration and deceleration phases to ensure torque transfer, and allowing relative movement during steady-state operation. This dynamic adaptation enables the passive guide-bush to achieve sufficient torque transfer capability without adding complex driving mechanisms.
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
Enables the compact and cost-effective support of lengthy and slender workpieces during machining, allowing for efficient torque transfer and axial movement without the need for additional complex driving mechanisms, enhancing the operational efficiency and reliability of machine tools.
Implementation Method 1
the spindle assembly and the rotary guide-bush assembly are configured to connect to each other by a torque transferring connection arranged between the spindle assembly and the rotary guide-bush assembly along the spindle axis, preferably so as to transfer driving torque during acceleration or deceleration of the spindle rotation
Implementation Method 2
a clamping mechanism with adjustable pressure levels
Implementation Method 3
freewheels for efficient torque transfer
Data Source
AI summary
A spindle apparatus for use at a machine tool, in particular a lathe, has: a spindle assembly including a workpiece spindle to receive an elongated workpiece and a spindle motor for driving spindle rotation; and a rotary guide-bush assembly axially arranged with the workpiece spindle, the rotary guide-bush assembly including a rotary guide-bush to receive the elongated workpiece and supported at the rotary guide-bush assembly to rotate with the elongated workpiece received in the workpiece spindle about the axis while enabling a movement of the elongated workpiece in the axial direction. The spindle and rotary guide-bush assemblies connect to each other by a torque transferring connection, between the spindle and rotary guide-bush assemblies along the axis to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor to the rotary guide-bush of the rotary guide-bush assembly.