In the manufacturing industry, thread machining is the process of forming threads in workpieces through the use of various processes such as cutting, turning, milling, grinding, and other similar operations. Most commonly, threading is associated with the method of creating threads on workpieces through the use of forming tools or abrasive tools, but it can also refer to a variety of other processes as well. Thread machining can be accomplished using a variety of different tools and techniques. The selection of tools corresponds, to be more precise, to the selection of the machining method being used.

In this section, we will examine the characteristics of various machining methods in greater detail. Based on the characteristics of these machining methods, we can determine which machining tool to use in actual production from a technical and economic standpoint in order to maximize productivity.

1. The process of threading a needle

When turning threads on a lathe, the use of a thread chaser or a forming turning tool can be very beneficial to the process. In single-piece and small-batch production environments, the forming turning tool turning thread is frequently used for the machining of threaded workpieces due to the tool's straightforward design and ease of use. Though thread chaser tools are suitable for medium and large-scale production of short-threaded workpieces with fine teeth, such as those used in the automotive industry, they are not suitable for small-scale production. This is due to the complexity of the tool structure.

2. Thread milling is a technique for milling threads that is used in the aerospace industry.

When milling threads on the milling machine, a disc cutter or a comb cutter should be used to achieve the desired results. Disc cutters are the most commonly used type of cutter for milling trapezoidal external threads on screw, worm, and other workpieces, and they are also the most expensive. Comb cutters are used to mill internal and external common threads, as well as tapered threads, in a variety of materials using a variety of cutting tools. Thread milling has a pitch accuracy of 8-9 grades and a surface roughness of R5-0.63 microns, both of which are considered acceptable in the thread milling community. When it comes to mass production of threaded workpieces of general accuracy or roughing before grinding, this method is a good choice because it is fast and inexpensive.



3. Another option is to grind the threads of the threads.

This material is primarily used in the thread grinding industry for the precision threading of hardened workpieces, and it is also used in the aerospace industry. Single-line grinding wheels are classified into two types based on the shape of the grinding wheel: single-line grinding wheels and multi-line grinding wheels. Single-line grinding wheels are more common than multi-line grinding wheels. Surface roughness of R1.25 to 0.08 microns can be achieved with single-line grinding, and thread pitch accuracy of 5 to 6 grades can be achieved with single-line grinding, with thread pitch accuracy ranging from 5 to 6 grades. A wide range of applications, including precision screws, thread gauges, worms, small batches of threaded workpieces, and shovel grinding precision hobs, are suitable for this method of manufacturing precision screws.

The two types of multi-line grinding wheels available are longitudinal grinding and plunge grinding. Longitudinal grinding is the more common of the two. The longitudinal grinding method is distinguished by the fact that the width of the grinding wheel is smaller than the length of the thread to be ground, and the grinding wheel can be ground to the final size by moving the grinding wheel one or several strokes in the longitudinal direction during the grinding process. The longitudinal grinding method is also known as the thread grinding method. The plunge grinding method necessitates the use of a grinding wheel that is wider than the length of the thread that is being ground as a result of this requirement. The grinding wheel cuts into the workpiece's surface in a radial direction, causing it to become rough. By rotating the workpiece approximately 1.25 times, it is possible to grind it down. This increases productivity while simultaneously decreasing accuracy by a small margin, as shown in the graph. In addition to shovel grinding large taps, the plunge grinding method is effective when it comes to grinding certain fastening threads, such as those on bolt and nut threads.

4. Tapping and die-head threading are two critical steps in the manufacturing process.

Tapping is the process of screwing a tap into a bottom hole on a workpiece that has been pre-drilled in order to process an internal thread by applying a specific amount of torque.

During the die-head threading process, a die cuts an external thread on the bar (or tube) workpiece, which is then threaded.

The accuracy of the tap or die is what determines the accuracy of the threading or tapping operation performed on the die-head itself. However, despite the fact that there are many different approaches to creating internal and external threads, tapping is the only tool that can be used to create internal threads with a small diameter. There are several options for this type of work, including manual tapping and die-head threading, as well as the use of lathes, drilling machines, tapping machines, and die-head threading machines, among others.

5. Thread rolling is a technique that can be used.

Plastic deformation of the workpiece by means of a rolling die in order to produce threads on it is a machining technique used to produce threads on a workpiece. In most cases, thread rolling is done on a thread rolling machine, which is specifically designed for the mass production of external threads on standard fasteners and other threaded couplings in a controlled environment. When working with soft materials, grooveless extrusion taps can be used to cold-extrude internal threads on softer workpieces if the material is soft enough. Internal threads cannot be processed by rolling in most cases. Operating on the same principle as tapping, this method is very effective. While the required torque is approximately twice that of tapping, the machining accuracy and surface quality are slightly higher when cold extruding the internal thread than when tapping.