Deep Hole Drilling of Helical Pipe Recesses With Lower Tool Wear
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Solution Overview
Problem
Conventional deep hole drilling methods face challenges in efficiently producing pipes with helical inner recesses, as the cutting tool primarily moves in a circumferential direction, leading to prolonged engagement times and difficulties in replacing worn cutting edges without retracting the tool back to the exact point of termination.
Innovation Solution
The method involves a deep hole drilling machine that uses a tool with a cutting edge on its outer circumference, which is moved helically along the inside of the pipe through a combination of rotational and axial movements, allowing for more frequent tool edge replacement and reduced engagement times by producing a helical cutting line that matches the desired recess.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cutting tool moves only in circumferential direction at one point, then the inner profile section at that point is produced, but the cutting edge engagement time is prolonged and replacement becomes difficult
Solution Approach 1:
The cutting tool is moved not only in the circumferential direction but also in the axial direction of the pipe, creating a helical cutting path. This dimensional change allows the cutting edge to traverse along the pipe length, completing cuts at multiple positions before replacement is needed, thereby reducing engagement time and facilitating easier replacement by moving the tool axially to new starting positions.
Solution Approach 2:
The cutting tool employs dynamic movement combining rotational motion around the pipe and axial progression along the pipe length. This dynamic helical path allows the cutting edge to continuously engage and disengage from different locations, optimizing cutting efficiency and enabling systematic replacement strategies where the tool can be repositioned axially after completing a set of circumferential cuts.
2Productivity
If the cutting edge completes cuts along a helical cutting line, then frequent tool edge replacement is enabled, but the tool movement complexity increases
Solution Approach 1:
The tool combines two fundamental motions - rotation around the pipe and axial movement along the pipe - into a single integrated helical cutting action. By merging these motions, the system achieves complex helical cutting paths using standard mechanical components rather than requiring specialized mechanisms, thus improving productivity while controlling device complexity.
Solution Approach 2:
The cutting tool is designed with multi-functionality, capable of performing both circumferential cutting and axial progression functions. This universal tool can produce helical recesses along the entire pipe length and can be systematically repositioned for multiple passes, enabling frequent cutting edge replacement without requiring different tools for different cutting patterns.
3Manufacturing precision
If the tool is retracted back to the exact point of termination for cutting edge replacement, then precise cutting position is maintained, but processing time increases
Solution Approach 1:
The system is designed to anticipate cutting edge wear by monitoring the helical cutting progress. Before the cutting edge becomes fully worn, the tool can be repositioned axially to a new starting position while the cutting edge still has remaining life, allowing for proactive replacement without requiring retraction to the exact termination point. This preliminary action maintains precision while reducing idle time.
Solution Approach 2:
Instead of methodically retracting to the exact termination point for replacement, the system allows the cutting tool to skip ahead axially to a new starting position. This rushing through approach accepts a small positional adjustment that can be corrected during the next cutting pass, significantly reducing replacement time while maintaining acceptable manufacturing precision through subsequent pass adjustments.
Data Source
AI summary
The invention relates to a deep hole drilling method for producing a pipe with an inner profile which has at least one recess extending helically along the inner side of the pipe, wherein with a deep hole drilling machine a tool, comprising a basic body extending along a longitudinal axis and at least one cutting edge arranged on an outer circumference of the basic body, is pulled or pushed through the interior of the pipe while being turned about its longitudinal axis, so that the cutting edge completes a cut along a helical cutting line on the inner side of the pipe.