Thread rolling and screw machine experts CJWinter and Davenport Machine Tool Company will once again showcase at this year’s Precision Machining Technology Show (PMTS 2017).
Thread rolling hard materials isn’t always impossible.
Because hardened metals don’t flow easily to fill die threads, they often require a thread cutting process to manufacture.
There’s also the risk of breakage — some materials, especially aerospace metals, are simply too brittle to be thread rolled.
Typically, 150 kilopounds per square inch is the cutoff for thread rolling. These materials are just too strong. However, new alloys are changing the way thread rolling works.
When thread rolling screws and fasteners, it’s important to maintain minimum wall thickness.
This can be a challenging task, particularly when designing and manufacturing thin-walled parts, including bolts and screws, that require thread rolling.
If your design includes walls that are thin, thread rolling parts can become problematic during production, as distortion can occur. Distortion not only causes flaking and non-uniform thread geometry on a completed part, but it can also lead to the tearing or collapse of a part’s threaded portion during the thread rolling process.
Over the course of our 60 years of providing thread rolling solutions CJWinter has fielded a number of questions about the process — including dies, attachments, and other related tooling.
One of the most common questions we receive is: “How should I calculate thread rolling penetration rate?”
Protecting your assembly from moisture and debris is critical to avoid leaks and contamination.
Over CJWinter’s 60 years of experience in the industry, we’ve identified a number of ways to keep thread rolling attachments running efficiently. Let’s look at an airline assembly as an example.
CJWinter’s premium selection of thread rolling products is now easier to access than ever before.
We are excited to announce the launch of our new online product catalog, filled with features that simplify the procurement of thread rolling tools and replacements for virtually any industry.
All threaded fasteners, fittings and connectors must be measured using accurate gaging methods to ensure the highest quality.
Blank specifications vary on straight threads and tapered pipe threads. When rolling a straight thread, machine the part's blank diameter to the maximum pitch diameter - .002 inch. Roll the thread until the pitch diameter is within specification — between the pitch diameter's maximum and minimum — and adjust the blank diameter until the major diameter is within specification — between the major diameter's maximum and minimum.
An incorrectly sized blank diameter can result in thread rolling issues like tapered threads, slivers and flakes, and off-size threads.
Blank design, therefore, is an important consideration in the thread rolling process to ensure parts are manufactured to the highest quality.
Working in the thread rolling industry for over 60 years, CJWinter has seen its fair share of thread rolling problems of all types.
Blank diameter, material type, and rate of penetration all play major roles in the performance of your thread rolling solution. Over the years, we identified the most common thread rolling issues and developed a series of solutions to address any challenge.
Of all the thread rolling problems we see on a regular basis, the following five represent the most common issues — and our recommended solutions to address them.