Lathe Thread Milling Assembly for Bird Nest-Free Pipe Threading
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Solution Overview
Problem
The existing methods for cutting threads on pipes and couplings in the oil and gas industry face challenges with managing wire-like chips that form 'bird nests', posing safety risks and slowing production due to the need for manual clearance, which can damage freshly cut threads.
Innovation Solution
A CNC threading lathe with a tooling assembly that includes a milling tool holder and drive, allowing the thread milling tool to rotate independently of the workpiece, enabling the milling of threads without forming long wire-like chips, thus reducing or eliminating bird nests and improving safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If turning operations are used to cut threads on pipes and couplings, then threads can be cut with precision sufficient to limit leakage and failure risk, but wire-like chips form bird nests that require manual clearance, posing safety risks and slowing production
Solution Approach 1:
The patent replaces the conventional turning operation with a milling operation. Instead of rotating the cutting tool against the stationary workpiece (turning), the system rotates the workpiece and uses a milling cutter with multiple teeth to mill the threads. This substitution fundamentally changes the chip formation mechanism from long wire-like chips to short broken chips, eliminating bird nest formation while maintaining thread precision and significantly improving production efficiency
2Manufacturing precision
If turning operations are used to cut threads, then threads can be cut with required precision, but operator safety is compromised due to sharp wire-like chips forming bird nests that require manual hooking and clearing
Solution Approach 1:
The patent replaces the turning operation with a milling operation, fundamentally changing the chip formation mechanism. The milling cutter with multiple teeth produces short, broken chips instead of long wire-like chips, eliminating the sharp bird nests that pose safety hazards to operators while maintaining the required thread cutting precision
3Reliability
If lathe is stopped to clear bird nest obstruction, then safety is maintained and threads are protected from damage, but production time is severely slowed
Solution Approach 1:
The patent replaces turning with milling operations, which fundamentally eliminates bird nest formation. The milling process produces short, broken chips that are easily evacuated without requiring machine stoppages, thereby maintaining thread quality protection while eliminating production downtime associated with manual chip clearance
4Ease of manufacture
If wire-like chips are managed using conventional turning operations, then thread cutting can proceed, but chip clearance requires manual intervention with metal hooks, creating safety risks from sharp chips and spring action
Solution Approach 1:
The patent replaces turning operations with milling operations, fundamentally changing the chip formation from long wire-like chips to short broken chips. This substitution eliminates the need for manual chip clearance operations with metal hooks, making the operation safer and easier while maintaining thread cutting capability
Data Source
AI summary
A tooling assembly for a lathe machine includes a tool platform configured to be mounted on the lathe machine, a milling tool holder fixedly secured to the tool platform and workable to releasably secure a thread milling tool therein, and a milling tool drive. The milling tool drive is operatively connected to the milling tool holder and operable to rotate the milling tool holder independently of a work holder to mill threads on the workpiece when a pipe thread milling tool is secured in the milling tool holder. Computer numerical control threading lathes and methods of milling threads in tubular workpieces are also described.