March 13, 2019

Several forms of wear by which a drill bit is worn

The drill bit is semi-closed cutting, and the heat of drilling is difficult to spread outward, so it is easier to form a high cutting temperature. Therefore, the main cause of bit wear is thermal wear, for high-speed steel bit, mainly phase change wear. In addition, there are contact fatigue, excessive deformation, edge breaking, brittle […]

Technology
March 6, 2019

Methods of drilling twist drill and points for attention

Drilling methods: Before drilling, the workpiece plane should be leveled. No convex platform is allowed in the center to facilitate the correct centering of the twist drill.  Align the tailstock so that the center of the twist drill is aligned with the axis of rotation of the workpiece. Otherwise, the diameter of the hole may […]

Technology
February 26, 2019

Selection of Cutting Fluid in Drilling

Selection of Cutting Fluid in Drilling   Material for twist drills Material to be drilled low carbon steel medium-carbon steel hardened steel High Speed Steel Twist Drill Use 1%~2% low concentration emulsifier, electrolyte aqueous solution or mineral oil Use 3%~5% medium concentration emulsifier or extreme pressure cutting oil Use extreme pressure cutting oil Cemented carbide […]

Technology

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