Machine Tool Spindle and Feed Rod Drive Control
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Solution Overview
Problem
Conventional machine tool control methods consume unnecessary power as they independently optimize the spindle rotation and feed rod movement, leading to mismatched arrival times at target states, causing one control object to wait for the other, resulting in inefficient power usage.
Innovation Solution
A machine tool system with a storage device, calculation unit, comparison unit, and drive control unit that calculates and compares the arrival times of the spindle and feed rod at their target states, adjusting the drive of the feed rod to match or exceed the spindle's arrival time to minimize waiting and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spindle and feed rod are controlled independently to arrive at target states in the shortest time, then the productivity is improved, but the power consumption increases due to unnecessary waiting
Solution Approach 1:
The patent merges the control of the spindle and feed rod by coordinating their arrival times at target states. The drive control unit integrates both control objects and adjusts their operation schedules so that they arrive simultaneously, eliminating independent control and the resulting power waste from waiting.
Solution Approach 2:
The patent applies dynamics by making the control parameters adaptive. The drive control unit dynamically adjusts the operation of the feed rod or spindle based on real-time conditions and calculated arrival times, allowing the system to optimize both speed and energy consumption rather than operating at fixed maximum rates.
2Manufacturing precision
If the spindle and feed rod are controlled independently with maximum acceleration and deceleration, then the manufacturing precision is maintained, but the time efficiency decreases due to waiting periods
Solution Approach 1:
The patent applies preliminary action by calculating the arrival times of both the spindle and feed rod in advance using stored maximum acceleration and deceleration data. The drive control unit uses these pre-calculated times to coordinate their operation, ensuring they arrive at target states simultaneously without compromising positioning accuracy.
3Productivity
If the feed rod arrives at target state before the spindle, then the spindle must wait, causing unnecessary power consumption
Solution Approach 1:
The patent applies feedback by having the drive control unit continuously monitor the operation status of both the spindle and feed rod, compare their arrival times, and adjust the feed rod's operation accordingly. This closed-loop control ensures the feed rod arrives at the target state in sync with the spindle, eliminating unnecessary waiting and power consumption.
Data Source
AI summary
A machine tool includes a time calculation unit calculating the time for a spindle to arrive at a target rotational speed, and the time for a spindle head to arrive at a target position; a comparison unit comparing the time to arrive at the target rotational speed and the time to arrive at the target position; and a drive control unit controlling the drive of the spindle and the drive of the spindle head. The drive control unit controls the drive of the spindle head, when a determination is made that the time to arrive at the target rotational speed is longer than the time to arrive at the target position, such that the time for the spindle head to arrive at the target position is longer than the calculated time to arrive at the target position, and less than or equal to the calculated time to arrive at the target rotational speed. Accordingly, the machine tool can drive the spindle head that is a control object in a power-saving mode.