Cutting tools for tube sheet machining
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Recently, the company needs to machine a tube sheet made of S32168 alloy. The thickness of this tube sheet is 230 mm; it is necessary to drill holes in it, with a diameter of 25.25±0.1 mm. The distance between the tube holes is 32 mm. What type of drill bit should be used on a machining center to drill the pilot holes?
Use a high-speed steel or cemented carbide drill bit with a diameter of approximately 25.15 mm to drill the bottom hole on a machining center. If high precision and surface finish are required, a drill bit slightly smaller than the final size can be used for rough drilling, followed by fine machining or hole finishing using cutting tools to achieve the desired diameter and tolerance specifications. .
With such a thick tube sheet, ordinary drills don’t have a length long enough for this purpose. Are there any custom-made drills with such a long length? When the plate is thick, a longer drill is required; but does this result in reduced stiffness of the drill, making it prone to breaking or causing the hole to be drilled at an angle?