Thread rolling screws are threaded fasteners with threads that securely and reliably connect different materials together. These screws produce threads in the material, such as plastic, by pushing the material outward. Thread rolling screws are often used in applications in which it is desirable to avoid the production of loose chips that are typically produced by thread cutting screws. At ITW Shakeproof Industrial, we provide an array of thread rolling screws metal and plastic materials are often used in conjunction with these types of screws for the production of strong connections.
The Action of Thread Forming Screws
Thread rolling screws, as opposed to traditional screws, do not require a tapped hole in advance of insertion. Instead, these fasteners form or roll their own threads as they penetrate the material and displace it, instead of removing it.
Some of the common problems associated with thread rolling include:
Slivers/Flakes in Threads
Rolls that are mismatched, overfilled, or incorrectly measured can lead to flaking or slivers in the threads.
Incorrect Pitch/Lead
In some cases, thread rolling screws may have an incorrect pitch or lead. A comparator must be used to help ensure an accurate pitch by measuring as many fill threads as possible. To find the precise pitch, divide that measurement by the number of threads measured.
Mismatched Helix Angle
If a thread role remains in contact with the blank for an over-extended period of time, a common issue referred to as screw jacking occurs. On the other hand, mismatched helix angles can result when roles or attachments are pulled into the collet when they remain on the component for an over-extended period of time.
Drunken Threads
These types of threads have an erratic pitch, causing revolution irregularities. The causes may include misalignment and unmatched roles. It is important to check if the slides should have their alignment adjusted or if the roles require resynchronization. If an accuracy is found in any of the roles, it is important to replace it with the correct roll.
Poor Finish
A poor finish can negatively impact the final product, even if everything else in the process goes smoothly. There are various factors that may cause an inadequate finish during thread rolling.
To learn about the thread rolling screws metal and plastic surfaces can accept, and which we offer at ITW Shakeproof Industrial, call us today at 920.261.2652 or send us a message through our contact form.
