Seven thread processing methods explained in detail! Don’t miss it


Threading is a method of processing various internal and external threads with threading tools. There are different methods of thread processing. We have summarized seven thread processing methods for your reference.


1. Thread cutting


Generally refers to the method of processing threads on the workpiece using forming tools or grinding tools, mainly including turning, milling, tapping and thread grinding, grinding and cyclone cutting. When turning, milling and grinding threads, every time the workpiece rotates, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves one lead accurately and evenly along the axial direction of the workpiece.



2. Thread turning


Threads can be turned on a lathe using a forming tool or a thread comb. Turning threads with a forming turning tool is a common method for single-piece and small-batch production of threaded workpieces due to its simple tool structure; turning threads with a thread comb tool has high production efficiency, but the tool structure is complex and is only suitable for medium and large batch production. Turning fine threaded workpieces with short threads.



3. Thread milling


Milling is performed on a thread milling machine with a disc or comb cutter. Disc milling cutters are mainly used for milling trapezoidal external threads on screw rods, worms and other workpieces. Comb milling cutters are used for milling internal and external ordinary threads and tapered threads. Since they are milled with a multi-edged milling cutter and the length of the working part is greater than the length of the thread being processed, the workpiece only needs to be rotated 1.25 to 1.5 turns to process. Done, very productive.



4. Thread grinding


It is mainly used for processing precision threads of hardened workpieces on thread grinders. According to the different cross-sectional shapes of the grinding wheels, it can be divided into two types: single-line grinding wheel and multi-line grinding wheel. The pitch accuracy that can be achieved by single-line grinding wheel grinding is 5 to 6 levels, and the surface roughness is R1.25 to 0.08 microns. The grinding wheel dressing is more convenient. This method is suitable for grinding precision screws, thread gauges, worms, small batches of threaded workpieces and relief grinding of precision hobs.



5. Thread grinding


Nut-type or screw-type thread grinding tools are made of soft materials such as cast iron. The parts of the processed threads on the workpiece that have pitch errors are ground in forward and reverse rotation to improve the pitch accuracy. Hardened internal threads are usually ground to eliminate deformation and improve accuracy.


6. Tapping and thread threading


Tapping is to use a certain torque to screw a tap into a pre-drilled bottom hole on the workpiece to process an internal thread.

Threading is to use a die to cut external threads on the bar (or pipe) workpiece. The processing accuracy of tapping or threading depends on the accuracy of the tap or die. Although there are many methods for processing internal and external threads, small-diameter internal threads can only be processed with taps. Tapping and threading can be performed manually, or lathes, drill presses, tapping machines and threading machines can be used.


7. Thread rolling


The processing method of using a forming rolling die to plastically deform the workpiece to obtain threads. Thread rolling is generally performed on a thread rolling machine or an automatic lathe equipped with an automatic opening and closing thread rolling head. It is suitable for mass production standards. External threads for fasteners and other threaded connections.


The above are different thread processing methods, for reference only. Our BTMA Machinery mainly produce oil press machine, oil filter machine, oil refining machine and other related machine with pressing edible oil. And we will also customize the oil extraction production line exclusively for you according to your specific needs and your local actual situation. So if you have any questions about oil mills, please contact BTMA without any hesitate.

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