Knurling
Knurling
Knurling is a machining process that forms regular raised patterns on the surface of a workpiece by pressing or rolling with a knurling tool. It is a classic material-removal or deformation method, creating textured surfaces by applying pressure or removing a small amount of material.
Main Functions:
1.Increase friction and prevent slipping — the most common purpose.
2.Decorative appearance — knurling can create unique visual patterns that enhance the look and perceived quality of the product.
3.Improve handling — knurled designs make rotating or gripping tools smoother and more efficient, such as on knobs and handles in machining applications.
4.Extend service life — knurling improves surface wear resistance, helps withstand everyday abrasion, prolongs product lifespan, and reduces maintenance costs.
What are the different types of knurling patterns?
1.Straight Knurling
Knurling direction: parallel to the workpiece axis.
Commonly used for: tool handles, the outside of nuts.
2.Twill knurling
Twill direction: left-slanted or right-slanted.
3.Diamond Knurling
A diamond pattern formed by left and right diagonal weaves.
Divided into: coarse knurling and fine knurling.
Common Knurling Issues
1.Misaligned or disordered knurling teeth
2.Uneven knurling, inconsistent depth
3.Deformation of thin-walled parts
4.Material roughness, rough surface
5.Avoid repeating patterns
Inspection Standards for Knurling
1.Visual Inspection
- Clear knurling, no broken teeth, no collapsed corners
- No indentations or tears on the surface
2.Dimensional Inspection
- Outer diameter after knurling
- Knurling width
- Pitch
3.Hand Feel Inspection
- Moderate grip and anti-slip effect
- No obvious sharp edges that could cut your hand
4.Edge Chamfering
- Both ends of the knurled area should be chamfered to prevent burrs