What is screw thread forming
Screw thread forming is a manufacturing process used to create threads on a workpiece without the need for cutting or removing material. It is typically used on softer materials such as steel, aluminum, or plastic.
In screw thread forming, a screw or a die with the desired thread profile is pressed into the workpiece material at a controlled force and speed. This creates the threads by displacing and deforming the material rather than removing it. The threads are formed by flowing the material into the shape of the screw or die.
There are two main types of screw thread forming processes: thread rolling and thread tapping.
Thread rolling involves using a set of hardened dies to roll the workpiece material into the desired thread shape. The dies have a profile that matches the thread profile, and as they rotate, they press into the workpiece material and reshape it. This process is commonly used for creating threads on screws, bolts, and other threaded fasteners.
Thread tapping, on the other hand, involves using a tap to cut or form threads inside a pre-drilled or pre-formed hole. The tap has a cutting edge or threads that gradually carve into the workpiece material, creating the threads as it is rotated. This process is commonly used for creating internal threads in metal or plastic parts.
Screw thread forming offers several advantages over traditional thread cutting methods. It allows for faster production speed, increased thread strength, and improved dimensional accuracy. It also reduces the risk of material waste and tool wear. Additionally, the formed threads may have improved resistance to stripping or loosening compared to cut threads.