Machine Tool Clutch Positioning for Accurate Mode Switching
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Solution Overview
Problem
In existing machine tools, the position of the spindle is not accurately known when switching between spindle operation and clamping operation modes, leading to incorrect engagement of the serration in the clutch device, resulting in vibrations, noises, and processing defects.
Innovation Solution
A machine tool electrical driving system that includes a position detection unit with encoder pulleys and a timing belt to accurately detect the position of the serration of the clutch unit, and a controller that adjusts the position of the drive pulley based on this information to ensure correct engagement of the serration during mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the spindle operation mode is switched to clamping operation mode without accurate position detection, then the mode switching is simple and fast, but the serration engagement becomes incorrect causing vibrations and noises
Solution Approach 1:
The encoder detects the position of the serration in advance before mode switching occurs. The controller uses this pre-detected position information to determine the exact rotational position of the drive pulley, allowing the system to prepare for accurate serration engagement before the actual mode transition begins, thus avoiding vibrations and noises while maintaining fast switching
2Device complexity
If the serration position is not detected accurately during mode switching, then the clutch device structure remains simple, but the rotational force transmission becomes inaccurate causing processing defects
Solution Approach 1:
An encoder is introduced as an intermediary detection device that measures the rotational position of the drive pulley through a timing belt and encoder pulley system. This intermediary component provides accurate position feedback without significantly complicating the overall clutch device structure, enabling precise rotational force transmission during mode switching while maintaining manufacturing precision
Solution Approach 2:
The encoder provides real-time feedback on the drive pulley's rotational position to the controller. This feedback mechanism allows the controller to accurately determine when the serration is in the correct engagement position, ensuring precise rotational force transmission from the drive pulley to the spindle while keeping the clutch device structure relatively simple
3Ease of operation
If the clutch device serration engagement is incorrect during mode switching, then the system operation is simple without position detection, but vibrations and noises occur reducing system stability
Solution Approach 1:
The encoder and controller system automatically detects and corrects the drive pulley position to ensure accurate serration engagement during mode switching. This self-service mechanism operates transparently without requiring manual intervention, maintaining ease of operation while simultaneously ensuring system stability by preventing incorrect engagement that would cause vibrations and noises
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 system ensures accurate engagement of the serration in the clutch unit during mode switching, preventing vibrations, noises, and processing defects, and maintaining a correct driving control in each operation mode.
Implementation Method 1
a timing belt wound around the first encoder pulley and the second encoder pulley to transmit a rotational force of the first encoder pulley to the second encoder pulley
Data Source
AI summary
Disclosed is a machine tool ELECTRICAL DRIVING SYSTEM capable of selectively transmitting power of a motor for driving a spindle in a lathe which machines a workpiece to a rotation system including a drawbar and a spindle for driving a chuck, using a clutch mechanism. The machine tool ELECTRICAL DRIVING SYSTEM includes a housing, a hollow tubular spindle rotatably installed inside the housing, a drive pulley rotatably installed with respect to the spindle outside the spindle, a spindle motor, a drawbar installed to be linearly movable with respect to the spindle but non-rotatable relative to the spindle, a motion conversion unit configured to convert a rotary motion of the drive pulley into a forward-rearward linear motion of the drawbar, a clutch unit, a position detection unit configured to the drive pulley to detect an amount of rotation and a rotation position of the drive pulley, and a controller.