What Are The Different Types of Thread Rolling Machine?

There are 2 main Thread Rolling methods: Infeed Rolling and Through-feed (Thrufeed) Rolling. While almost all industrial thread rolling machines use these 2 methods, they differ when it comes to their use cases.

Infeed rolling method uses circular dies where the thread angle is equal in magnitude but opposite in direction. This method is also commonly referred to as the plunge method. The workpiece and the dies are placed parallel in this method and move in synchronization to form the threads. The main advantage of this method is the speed of the process, which makes it ideal for mass production. And machines that use this method come with 2 or 3 dies according to the specifications. However, the rolling is limited to the maximum length of the dies meaning that it is typically used for shorter threads and for parts with more complex shapes or profiles.

Infeed Rolling with Circular dies

Thrufeed rolling method, on the other hand, is a continuous process where the part is fed through the machine, and the die rolls along the entire length of the part in a single pass. This method is more efficient in creating longer threads or larger quantities of parts. The dies in this process are usually placed at an angle the tilted Helix angle helps in the continuation of the rolling process, allowing for longer workpieces. Even though this method excels in managing much longer workpieces, it is typically limited to parts with simple shapes and profiles. The machines that use this method come with either Groove dies or Lead Corrected dies to fit the requirement of the work.

Throughfeed rolling with Groove Dies

So in retrospection, both infeed rolling and thrufeed rolling can produce high-quality threads with good surface finish and dimensional accuracy. The choice between the two methods will depend on the specific requirements of the part and the thread being produced.

Typical rollable Dimensions Infeed rolling

Ring Rolling Process