Deep-Hole Drilling Control for Adaptive Chip Discharge
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Solution Overview
Problem
Conventional canned cycle methods for deep hole drilling are inefficient due to the inability to adjust retraction amounts based on the depth of the hole, leading to chip accumulation and tool wear.
Innovation Solution
A numerical control device that includes a deep-hole drilling execution unit for performing first and second cutting operations with varying feed rates and a chip removal time calculation unit to determine optimal chip removal times based on the cutting tool's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant retraction amount is used in canned cycle drilling, then the drilling process is simple to control, but chip removal becomes inefficient at shallow positions and tool wear increases at deep positions
Solution Approach 1:
The patent applies dynamics by transitioning from a static, constant retraction amount to a dynamic, variable retraction amount that changes based on the current drilling depth. The retraction amount is calculated as a function of the current depth, allowing the system to adapt automatically: using smaller retraction amounts at shallow depths and larger retraction amounts at greater depths, thereby optimizing chip removal efficiency throughout the drilling process without manual intervention
Solution Approach 2:
The patent implements parameter changes by modifying the retraction amount parameter based on the drilling depth. Instead of using a fixed retraction value, the system calculates and adjusts the retraction amount dynamically according to the current depth position, enabling optimal chip removal at each stage of drilling while maintaining automated control
2Reliability
If a large retraction amount is used to remove chips from deep holes, then chip removal is effective at deep positions, but unnecessary retraction operations occur at shallow positions reducing drilling efficiency
Solution Approach 1:
The patent applies local quality by tailoring the retraction amount to the specific local condition of drilling depth. Instead of using a uniform retraction amount throughout the entire drilling process, the system calculates and applies appropriate retraction amounts specific to each depth level, ensuring effective chip removal at deep positions while avoiding excessive retraction at shallow positions
3Productivity
If a small retraction amount is used for shallow hole drilling, then drilling efficiency is high at early stages, but chips accumulate in deep holes causing tool wear and damage
Solution Approach 1:
The patent uses dynamics to adjust the retraction amount based on the current drilling depth, ensuring that the retraction amount is always appropriate for the current stage of drilling. This dynamic adjustment prevents chip accumulation at deep positions while maintaining efficient drilling at shallow positions, thereby protecting the tool throughout the entire drilling process
Data Source
AI summary
Provided is a numerical control device that appropriately promotes the discharge of chips and enables efficient drilling. This numerical control device comprises: a deep-hole drilling execution unit that performs deep hole drilling while repeating first cutting operation to cut a workpiece while rotating a cutting tool and second cutting operation to cut the workpiece at a slower speed than the first cutting operation while rotating the cutting tool; and a chip discharge time calculation unit that calculates the chip discharge time according to the position of the cutting tool after each cut in the first cutting operation. The deep-hole drilling execution unit performs the second cutting operation during the chip discharge time.