Mechanical Engineering - Workshop Technology - Discussion

The correct answer is: none of these.

Thread rolling is a process that can be applied to various materials, including:

- Ferrous materials (steels, irons)
- Non-ferrous materials (aluminium, copper, brass)
- Ductile materials (copper, aluminium, mild steel)
- Hard materials (hardened steel, titanium)

Thread rolling is a cold-forming process that uses dies to shape and form threads on a workpiece. The process is suitable for a wide range of materials, as long as they are not too brittle or too hard.

Here's why the other options are incorrect:

- Ferrous materials: Thread rolling is not restricted to ferrous materials only.
- Ductile materials: While thread rolling is often used for ductile materials, it's not limited to them.
- Hard materials: Thread rolling can be used for hard materials, but may require specialized dies and techniques.

Thread rolling is commonly used for:

- Creating strong, precise threads
- Improving material strength and fatigue resistance
- Reducing material waste and costs
- Enhancing surface finish and appearance

The suitability of thread rolling for a specific material depends on its properties, such as hardness, ductility, and strength.

Materials are limited to ductile materials because the threads are cold formed. However, this increases the thread's yield strength, surface finish, hardness, and wear resistance. Also, materials with good deformation characteristics are necessary for rolling; these materials include softer (more ductile) metals and exclude brittle materials, such as cast iron.

Tolerances are typically ±0.001 in. (±0.025 mm) , but tolerances as tight as ±0.0006 in (±0.015 mm) are achievable. Surface finishes range from 6 to 32 micro-inches.

Thread rolling is a cold forging process that can be performed on any ductile metal. The forming process can be used to produce other special forms, such as knurls. For the best quality threads, the process is performed on precision centerless ground blanks.

The blank diameter of a rolled thread is at the pitch diameter, a theoretical point between the major diameter and minor diameter.

Thread rolling is the preferred method for producing strong, smooth, precise, and uniform external thread forms. Thread rolling is different from other types of threading processes like cutting, grinding, and chasing.

The toughness of brittle materials is less so no ferrous and hard material the cracks will come in cold forming and thread rolling is cold working.

Since ductility states the metal can be deformed. Particularly at thin thread structures it will definitely deform.

Thread rolling is basically used for making external thread ' it is used in bolt for making thread, stud etc.

Thread rolling is restricted to use only ductile material because it posses good deformation properties.

Thread rolling is the process of making threads on fasteners by high pressure rolling dies.

Actually we cannot thread cut to hardmaterials. Because it resist the thread impression.