The development of intelligent manufacturing is currently identified as the primary means for enterprises to transform and upgrade their production processes, leading to a high-quality evolution in the industry.
During the advancement of intelligent manufacturing, however, many challenges present themselves. One such challenge is how to achieve thread chip breaking during precise CNC turning services, thereby eliminating the constraints of chip entanglement on automation.
In the typical machining environment, operators can physically eliminate chips but in automated systems, chip entanglement serves as a major limitation; it deters any headway at that production line station throughout its progress which affects other components downstream.
The initial step in tackling the issue of chip entanglement when thread turning is to have an understanding of thread machining. This involves a study of the principles of thread machining.
Design Factors
The solution proposed for thread chip breaking in automatic turning processes is required to satisfy the following conditions:
- The quality of thread machining must comply with specified standards.
- The system should be able to operate without human intervention on the automation production line.
- Simple, practical, and efficient design principles should be adopted.
- Utilize variable programming to achieve integrated modularity.
- Ensure that safety measures are considered for equipment, tools, and operators during production.
Types of Equipment and Tools
No need for any exotic equipment; a simple CNC lathe will do the job. It is proposed to use a screw-clamped threading toolholder of 25 mm x 25 mm dimensions for the thread turning tool. Such a toolholder is highly universal, economically viable and it facilitates a swift change of inserts without complications. The selection of threading insert must depend on the material of workpiece and cutting parameters.
Process Plan for Segmented Turning
Segmented turning process plan is adopted. This method involves breaking long cuts into shorter segments, resulting in small segmented chips. With this approach, successful thread chip breaking can be achieved without any entanglement of chips during production.
Threads fall under different types depending on what they are used for. When it comes to CNC lathe thread turning, these details must be identified: the thread profile and whether the thread body is cylindrical or conical. Also take into account the nominal diameter, pitch, number of starts and direction of rotation for the thread. Through CNC threading commands, the toolpath is commanded to move in either a straight or tapered trajectory— corresponding to straight threads or tapered threads, respectively.
Two basic types of threads are straight and tapered threads, while another type combines both and is known as chain threads. The idea of chain threads forms the basis for segmented machining; this process involves incorporating both tapered and straight threads alternately. In segmented thread machining, therefore, the entire thread is broken into several segments: alternating between tapered and straight sections helps achieve coordination offsets that deal with the disparities in start point irregularities. This segmentation approach manages to facilitate chip breaking as it forms part of the essence of threading operations effectively.
Oscillating Turning Process Plan
The turning operation creates threads by first making half the thread pitch at a time. The oscillating turning process plan splits thread machining into two stages— roughing and finishing. For roughing, the threading tool cuts while oscillating, creating one side of the thread profile as it moves in and out along half the thread pitch. To achieve the other side of the thread profile, the threading tool performs another oscillating cut along the remaining half of the thread pitch; note that this pass should remove material from the other half of the thread pitch. Remember: both passes of the tool follow the same thread profile but remove material from different halves of the pitch.
The technique transforms the static-axis process of typical thread creation into a dynamic approach involving both X and Z axes. The tool moves in synchronization with these axes while tracing a sinusoidal trajectory— akin to that of a cosine curve— to achieve progressive thread formation. In finalization, it mirrors traditional thread manufacturing methods; the tool makes passes along the threaded outline according to specific material demands, ultimately culminating in the entire thread production. This new approach differentiates itself in both method and mechanism from standard procedures but still maintains similarity during the finishing phase for ease of adoption and adaptation by manufacturers.
Effectiveness Evaluation
The thread chip breaking has been achieved through successful application of both the segmented turning process and the oscillating turning process after continuous machining trials plus program optimization. The quality at the thread joining sections, surface quality of the thread profiles in each segment, and pitch accuracy were experimentally verified through practical trials using different materials. Various materials were selected for these trials, and the machining results were comprehensively measured using ring gauges and thread micrometers. All results fully met the technical drawing requirements which affirmed that these methods are indeed reliable and feasible.
A milestone in the evolution of automated thread turning: achieving chip breaking through processes. A result of thread chip breaking due to segmentation or oscillation— thus obviating entanglement issue, which is critical in automated thread turning. In its essence, it paves a way for automation production lines to take a leap forward.
While there are disadvantages with chip breaking methods: the tool life is nearly unchanged in relation to conventional thread machining under the same cutting conditions, but cycle time does increase. However, this additional time could be compensated by a lower demand for clearing away chips. The oscillating turning process must take into account that oscillating cuts are made along the X-axis which might affect the tool life because it depends on workpiece material and, specifically for materials such as high temperature alloys (difficult-to-machine materials), should also consider the impact of these oscillating cuts.
Conclusion
We began by deriving the thread machining principles and then harmonizing them with CNC system processing principles in intelligent manufacturing. We arrive at the optimization of the thread chip breaking process through this synthesis. This optimization has fostered disruptive innovation in thread machining technology— a fresh answer to thread turning with chip breaking. Our vision sees this approach, upon automatic thread detection technology maturity combined with thread chip breaking methods, as a trailblazer unveiling novel horizons for intelligent manufacturing design on thread machining solutions. In so doing, it promises substantial contribution towards catalyzing digital and intelligent manufacturing evolution, viewing that from the standpoint of two different systems (thread detection plus chip-breaking system).
People also read this: Top 4 Tips to Take Brilliant Wedding Photographs
