CNC Drilling Feed Control to Cut Non-Cutting Time
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Solution Overview
Problem
Existing machining systems fail to efficiently control the movement of a machining process, specifically in the machining process, the machining process is inefficient due to non-cutting time periods that are not effectively minimized.
Innovation Solution
A numerical value controller that includes a storage unit and a control unit to manage a machining program with a command for a workpiece height point, allowing the tool to move at a higher rate than the cutting feed rate from a return point to the workpiece height point, thereby overlapping movements to minimize non-cutting time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the tool moves from the return point to the workpiece height point at the cutting feed rate, then the machining precision is maintained, but the non-cutting time period increases
Solution Approach 1:
The tool moves at a high rate (higher than cutting feed rate) from the return point to the workpiece height point before the actual cutting operation begins. This preliminary high-speed movement positions the tool ready for cutting without compromising the precision of the subsequent cutting process, effectively separating the positioning phase from the cutting phase.
Solution Approach 2:
The patent implements dynamic speed adjustment during the drilling cycle. The control unit varies the movement rate of the tool based on the phase of operation: high speed during non-cutting movement (return point to workpiece height point) and controlled cutting feed rate during actual machining. This dynamic adaptation optimizes both time efficiency and machining precision.
2Productivity
If the tool moves at a high rate from the return point to the workpiece height point, then the productivity is improved, but the control complexity increases
Solution Approach 1:
The patent changes the movement parameter (speed/rate) based on the operational phase. The control unit adjusts the tool movement rate to be higher than the cutting feed rate during the approach phase (return point to workpiece height point), and uses the standard cutting feed rate during the cutting phase. This parameter adaptation enables high productivity without compromising control accuracy.
Solution Approach 2:
The drilling cycle is segmented into distinct phases with different speed requirements: the approach phase (return point to workpiece height point) and the cutting phase (workpiece height point to hole bottom). By segmenting the motion profile, the system can apply high speed only where necessary (approach) while maintaining precision during cutting, reducing overall cycle time without increasing overall control complexity.
Data Source
AI summary
A numerical value controller for a machine tool includes a storage unit storing a machining program for drilling a hole in a workpiece in accordance with relative movement between a tool and workpiece in a depth direction, and a control unit controlling the relative movement between the tool and workpiece based on the machining program and that moves the tool relative to the workpiece in the depth direction from a return point to a hole bottom point. The return point is a position retracted in the depth direction from a workpiece surface where the tool starts to perform drilling. The machining program includes a command for a workpiece height point as a position of the workpiece surface. The control unit moves the tool relative to the workpiece in the depth direction at a relative rate higher than a cutting feed rate from the return point to the height point.