CNC Thread Milling Assembly to Eliminate Bird-Nest Chips
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Solution Overview
Problem
Existing methods for cutting threads in pipes and couplings using turning operations 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 tooling assembly for CNC threading lathes that includes a tool platform, milling tool holder, and milling tool drive, allowing for independent rotation of the milling tool relative to the workpiece, with a static tool for turning operations, enabling simultaneous turning and milling without forming long chips or bird nests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If turning operations are used to cut threads in pipes and couplings, then thread-cutting precision can be achieved, but wire-like chips form bird nests that require manual clearance and slow production
Solution Approach 1:
The invention transitions from a static turning operation to a dynamic milling operation where the cutting tool rotates independently on its own axis while the workpiece rotates. This dynamic approach changes the chip formation mechanism from long wire-like chips to short curly chips, eliminating bird nest formation and allowing continuous operation without manual clearance, thereby resolving the contradiction between precision and productivity
Solution Approach 2:
The invention changes the fundamental parameters of the cutting operation by introducing independent rotation of the milling tool relative to the workpiece. This parameter change transforms the cutting mechanism, resulting in different chip morphology (short curly vs. long wire-like) and eliminating the need for bird nest clearance, thus improving productivity while maintaining precision
2Manufacturing precision
If turning operations are used to cut threads, then threads can be cut with precision, but operator safety is compromised due to sharp wire-like chips and spring action
Solution Approach 1:
By introducing independent rotation of the milling tool, the cutting action becomes dynamic rather than static. This changes chip formation from long, sharp, spring-like wires to short, curly chips that are less hazardous, thereby reducing operator safety risks while maintaining threading precision
3Manufacturing precision
If turning operations are used to cut threads, then threading can be performed, but production time increases due to stopping the lathe for bird nest clearance
Solution Approach 1:
The dynamic milling operation produces short curly chips that do not form bird nests, allowing the lathe to run continuously without stopping for clearance. This eliminates time loss while maintaining the precision benefits of controlled cutting operations
Solution Approach 2:
The milling operation enables continuous cutting action without interruption for chip clearance. The independent rotation of the milling tool creates chip formation that does not obstruct the cutting path, allowing the useful action of thread-cutting to continue uninterrupted, thereby reducing cycle time
4Object-generated harmful factors
If chip breaker devices are used during turning, then chip management is attempted, but bird nest formation remains common and unavoidable
Solution Approach 1:
Instead of attempting to manage wire-like chips during turning using chip breakers, the invention changes the cutting mechanism to milling with independent tool rotation. This fundamentally alters chip formation to produce short curly chips that naturally break and evacuate, making chip control reliable without additional devices
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.