Built-In Spindle Drive With Clutch for Precise Chuck Force Control
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Solution Overview
Problem
Conventional machine tools with hydraulic driving systems face issues such as slow response speed, difficulty in precisely controlling chuck clamping force, inefficiency due to belt-driven power transmission, and maintenance challenges, which hinder active management of workpiece gripping and cutting conditions.
Innovation Solution
A built-in type electric driving system that directly connects a motor to the spindle without a belt, using a clutch device to transfer power to both the drawbar and spindle, allowing for precise control of the chuck's rotational movement and clamping force through a motor-driven system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a hydraulic system is used to drive the drawbar and spindle, then the machine tool can operate with traditional power transmission, but the response speed is slow and the clamping force cannot be precisely controlled
Solution Approach 1:
The patent replaces the hydraulic driving system with an electric driving system. A motor is directly coupled to the spindle through a built-in driving mechanism, eliminating hydraulic pumps, motors, and control valves. This substitution enables precise control of the spindle's rotation and the drawbar's linear movement, significantly improving response speed and control precision while reducing system complexity.
2Loss of energy
If a belt-driven method is used to transmit power from motor to spindle, then the motor can drive the spindle, but efficiency is degraded due to friction and slips, and problems of noise, vibration, and maintenance arise
Solution Approach 1:
The patent extracts and eliminates the belt transmission component from the power transmission system. By adopting a direct-drive electric motor configuration where the motor is integrated with the spindle, the system removes the intermediate belt and pulley mechanisms. This eliminates energy losses from friction and slippage, reduces noise and vibration, and significantly decreases maintenance requirements.
3Measurement precision
If independent driving systems are used for drawbar and spindle with hydraulic system, then both components can be driven, but the clamping force of the chuck is difficult to be precisely controlled and cannot be actively managed
Solution Approach 1:
The patent implements a feedback control system where sensors detect the actual clamping force and spindle rotation parameters, and the control unit adjusts the motor output accordingly. This closed-loop control enables precise management of the chuck's gripping force according to workpiece material and cutting conditions, providing active adaptability that was impossible with traditional hydraulic systems.
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 solution simplifies the machine tool configuration and operation by enabling efficient, precise control of clamping and spindle rotation, eliminating the inefficiencies and maintenance issues associated with belt-driven systems, while allowing for active management of workpiece processing.
Implementation Method 1
a built-in motor consisting of a stator fixed to the inside of the housing and a rotor fixed to an outer surface of the spindle, and configured to generate torque between the stator and the rotor by power applied from the outside to cause rotation of the rotor
Implementation Method 2
a lead screw formed with a thread in a spiral shape on an outer surface thereof, and formed to be fixed to the drawbar; a female screw cover coupled to the driving unit to rotate together with the driving unit, and having a thread formed on an inner circumferential surface thereof to be screw-coupled to the thread of the lead screw
Data Source
AI summary
Disclosed is a built-in type electric driving system of a machine tool. The system is capable of directly connecting a motor, which drives a spindle in a lathe which processes a workpiece, to an outer surface of the spindle without using a belt to rotate the spindle, and is capable of selectively transferring the power of the motor to a rotation system including a drawbar and a spindle for driving a chuck using a clutch device.