In the world of computer numerical control (CNC) machining, a variety of finishing processes are employed to enhance not just aesthetics but also functionality and longevity of machined parts. Among such procedures is bead blasting, a method used for surface finishing metals and other materials. In this article, you will learn about what bead blasting is, its applications within CNC machining, and how it’s carried out.
Bead blasting, otherwise known as shot blasting or peen plating, is a process that involves forcibly propelling a stream of abrasive beads against a surface under high pressure. The main aim behind implementing bead blasting on any part during CNC machining is to improve its finish. Doing so improves visual appeal while setting up a prime base for painting, coating, or extra forms of part refinement.
The beads used in this procedure are generally spherical or irregular in shape, made from glass, ceramic, acrylic, silicone, aluminum oxide or even steel. These tiny particles polish the surface by abrading away minor imperfections when they collide with it; achieving a unidirectional satin finish over the entire component.
Within CNC machining, bead blasting offers an array of benefits worth considering. To begin with, it aids the removal of burrs — small intermittent bumps left after cutting or shearing operations. Also, compared to chemical treatments, bead blasting is considered environment-friendly as it doesn’t produce harmful toxins. Furthermore, bead blasting can increase wear-resistance, reduce friction, and better adhesion properties all while preserving dimensional accuracy. Therefore, no additional processing like grinding or polishing becomes necessary post-blasting. Undeniably, these features make bead blasting indispensable when producing intricate parts.
But how exactly does one carry out bead blasting? It transpires inside a special cabinet equipped with a dust collector to prevent airborne silica illnesses. There are four primary types of blasting machines suitable for different blasting requirements – Direct Pressure machines, Siphon/Suction machines, Wet Blasting Machines and Portable Abrasive-sandblasters.
The workpiece is placed in the controlled environment of the cabinet. High-powered air guns or nozzles release streams of abrasive beads focusing on the component. The operator (usually attired with a protective apron, gloves, and respirator) views through a sight glass and manipulates either directly using his hands or indirectly via robotic arms to ensure an even application across all surfaces. Throughout, bead velocity is controlled carefully – too slow can leave residual matter behind while excess speed risks gouging out material from parts.
Overall product quality hugely depends on accuracy during bead blasting. Hence, experience and expertise are vital because any missed spots will be visually apparent and could detrimentally affect part performance.
While post-production costs might increase due to bead blasting, its outcome certainly compensates; proving beneficial for industries where surface finish is paramount — automotive, aerospace, furniture to name few. It easily removes weld discoloration, heat treating scale, rust, creates decorative finishes that consumers value highly. Bead blasting has garnered appreciation globally becoming a favored choice across various manufacturing sectors.
In conclusion, the CNC machining industry recognizes the edge that bead blasting carries among other finishing processes. With continued technological advances in the process equipment and technique, bead blasting serves as an ideal solution many seek to enhance their product’s appearance and lifespan without compromising mechanical properties. After all, it offers more than just a pretty cover-up, providing practical advantages aesthetically and functionally.
