Feed Rod Position Control to Reduce Chuck Load in Bar Feeding
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Solution Overview
Problem
Existing rod member feeding devices generate high loads on spindle chucks and finger chucks when positioning a rod member, leading to increased stress on the associated devices.
Innovation Solution
A control device calculates the deviation between the commanded and actual positions of the feed rod, controlling the servomotor to retract the feed rod by the maximum deviation, and stops the motor when a predetermined torque limit is reached, reducing the load on the spindle and finger chucks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the feed rod advances the rod member with high torque to contact the stopper tool, then the positioning accuracy is improved, but the load on the spindle chuck and finger chuck increases significantly
Solution Approach 1:
The control device calculates the deviation between the command position (based on feed rod advance amount) and the actual position of the feed rod, then controls the servomotor driving based on the magnitude of the deviation. This feedback mechanism enables precise positioning while avoiding excessive torque application.
Solution Approach 2:
The servomotor is driven to retract the feed rod by the maximum value of the deviation calculated by sequentially comparing the command position with the actual position. This partial retraction action compensates for positioning errors without applying excessive load during the positioning process.
2Productivity
If the spindle chuck is closed and the stopper tool is quickly retracted after the rod member contacts the stopper, then the productivity is improved, but a large load is generated on the spindle chuck and finger chuck
Solution Approach 1:
The control device calculates the deviation between command position and actual position during the feed rod advancement, and determines the maximum deviation value before the positioning is completed. This preliminary calculation allows for smooth subsequent retraction without sudden load changes.
Solution Approach 2:
The control device stops the driving of the servomotor when the torque value reaches a predetermined torque limit value, and the servomotor is driven to retract the feed rod by the maximum deviation dynamically calculated. This dynamic control prevents excessive load while maintaining efficient positioning.
Data Source
AI summary
To provide a rod member feeding device that reduces the load on a spindle chuck and a finger chuck when a rod member is positioned, as well as providing a machine tool provided with the rod member feeding device, and a control method for the rod member feeding device. A rod member feeding device includes: a feed rod for supplying a rod member to a spindle; a servomotor for moving the feed rod along the axial direction of the spindle; and a control device (exemplified with a motor control device and a control device) for controlling the driving of the servomotor. The control device calculates a deviation between a command position based on an advance amount of the feed rod and the actual position of the feed rod that has been actually advanced by the driving of the servomotor, and controls the driving of the servomotor based on the magnitude of the deviation.