Knurling

Knurling is a manufacturing process whereby a pattern of straight, angled, or crossed lines is rolled into the material. This process is primarily used to provide a better grip on the machined object. It is a common procedure in metalworking where tools like knurling tools or knurl wheels are applied to create a rugged surface on a metal part, typically on handles, knobs, and other components that require manual adjustment or manipulation. The knurling process can be applied to various materials, including metals such as aluminum, steel, and brass, as well as some plastics, depending on the application's specific requirements.

Process

The knurling process involves the use of a knurling tool, which is pressed against the surface of the rotating workpiece. The tool has a toothed roller, which imprints the knurl pattern onto the material. There are two main methods of knurling: push knurling and cut knurling. Push knurling displaces the material to form the knurl pattern, while cut knurling removes material to create the pattern. Each method has its advantages and is chosen based on the material properties and the desired finish.

Types of Knurl Patterns

There are several types of knurl patterns, including:

• Straight Knurling: Features parallel lines and is often used for grips.
• Diagonal Knurling: Has lines that are angled relative to the axis of the workpiece, providing a more aesthetic finish.
• Diamond Knurling: Consists of crossed lines, creating a diamond-shaped pattern, offering the highest grip level.

Applications

Knurling is widely used in various applications where a secure grip or an aesthetic finish is required. Common applications include:

• Tool handles
• Knobs and dials on machinery
• Thumb screws and adjusters
• Barbell grips
• Medical devices

Advantages and Disadvantages

Advantages:

• Provides an enhanced grip on components
• Can improve the aesthetic appeal of a part
• Offers a cost-effective method for texturing surfaces

Disadvantages:

• Can weaken the workpiece due to material displacement (especially in push knurling)
• Requires specialized tools and skills to achieve consistent results

See Also

• Metalworking
• Machining
• Tool and die making

External Links

• ASM International
• Society of Manufacturing Engineers