Borrprocesser

Borrprocesser, or drilling processes, refer to the set of operations used to create holes in a workpiece. They encompass the sequential steps from initial hole creation to finish: drilling, reaming, countersinking, deburring, and boring, depending on required tolerance and finish. These processes are applied to metals, plastics, wood and composites.

Center drilling is used to establish a precise starting point and guide for subsequent drills; spot drilling creates a shallow guide hole. Primary drilling enlarges the hole; reaming improves diameter accuracy and surface finish, while boring may enlarge an existing hole to exact size or adjust straightness. Countersinking or counterboring forms a recessed entry for screw heads; deburring removes sharp edges after drilling to improve safety and fit.

Tooling and equipment: twist drills are common for metals; carbide drills offer wear resistance for hard materials; specialty bits include brad-point for wood and step drills for multistage openings. Drill bits may be high-speed steel, carbide, or coated. Drilling is typically performed on drill presses or CNC machines; chip removal, peck drilling and flood or mist cooling help manage heat and debris.

Process parameters and quality: chosen feed and speed depend on material, drill size, and coating; lubrication or coolant reduces heat, extends tool life, and improves finish. Accurate workholding, proper centering, and alignment are essential for hole position and straightness. Hole quality is assessed by diameter tolerance, roundness, surface finish, and positional accuracy.

Applications: drilling processes are fundamental in manufacturing, construction and electronics assembly, enabling fast, repeatable hole creation with varying tolerances and finishes.