Deep-Hole Pipe Drilling With Helical Inner Recess Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing deep hole drilling methods for producing pipes with helical inner recesses are inefficient due to prolonged engagement times of cutting edges, requiring precise retraction and replacement, and lack of flexibility in creating helical cuts.
Innovation Solution
A deep hole drilling method that incorporates a superimposed rotational and axial movement of the tool relative to the pipe, allowing cutting edges to create helical recesses by pulling or pushing the tool through the pipe while rotating it or the pipe about its longitudinal axis, enabling multiple cuts and indexable inserts for efficient cutting edge replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cutting edges are moved solely in the circumferential direction at a specific location, then the cutting path is simple, but the engagement time of cutting edges is prolonged and replacement is complex
Solution Approach 1:
The patent transforms the cutting motion from a single circumferential dimension to a combined helical path involving both circumferential and axial dimensions. The cutting edges follow a helical trajectory along the pipe interior, which reduces the engagement time by continuously progressing axially while cutting, rather than repeatedly traversing the same circumferential path.
2Device complexity
If cutting edges are moved solely in the circumferential direction, then the cutting mechanism is simple, but the flexibility for creating helical recesses is insufficient
Solution Approach 1:
The patent introduces dynamic control of the tool's rotational and axial movements to create flexible helical cutting paths. By coordinating the rotation of the tool about its longitudinal axis with its axial progression through the pipe, the system can adaptively create helical recesses with varying parameters, enhancing versatility while maintaining manageable mechanism complexity.
3Manufacturing precision
If the tool is precisely retracted for cutting edge replacement, then replacement accuracy is high, but production time is lost
Solution Approach 1:
The patent employs indexable inserts that can be pre-positioned on the tool, allowing cutting edges to be replaced without complete tool retraction. The helical cutting path ensures that cutting edges leave the workpiece frequently, enabling timely replacement of worn inserts while maintaining production continuity and reducing downtime associated with precise retraction and repositioning.
4Productivity
If cutting edges engage continuously in the pipe, then material removal is efficient, but stress on cutting edges increases
Solution Approach 1:
The helical cutting path creates a periodic engagement pattern where cutting edges alternately engage and disengage from the pipe interior. This periodic action allows worn cutting edges to leave the workpiece regularly, reducing accumulated stress and heat, while maintaining continuous material removal through the progressive helical motion. The system balances efficient material removal with stress management by controlling the engagement duration and frequency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces machining times, minimizes stress on cutting edges, and allows for more efficient production of pipes with helical recesses by optimizing cutting direction and frequency, enhancing cutting process smoothness and reducing vibrations.
Implementation Method 1
a tool having a base body extending along a longitudinal axis and n cutting edges arranged on the outer circumference of the base body is pulled through the interior of the pipe using a deep hole drilling machine and is rotated about its longitudinal axis so that the cutting edges make a cut along a helical cutting line on the inside of the pipe
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a deep-hole drilling method for producing a pipe (104) with an inner profile having at least one recess extending helically along the inside of the pipe (104), wherein by means of a deep-hole drilling machine (100), a tool (1) having a base body extending along a longitudinal axis and at least one cutter arranged on the outer periphery of the base body is pulled or pushed through the interior of the pipe (104) and is thereby rotated about its longitudinal axis and therefore the cutter makes a cut along a helical cutting line on the inside of the pipe (104).