When evaluating the different types of tools used in a particular process, it is often necessary to consider the level of production in the shop. The purpose of the center drill is to drill a hole of a specific aperture, depth and shape at the end of the workpiece for receiving the support tip of a lathe or grinder. Prior to the turning or grinding of all slender workpieces, the center hole must be drilled in advance.
The two most popular types of center drills are high speed steel center drills and solid carbide center drills. High-speed steel center drills are highly cost-effective and generally suitable for workshops where the production volume is small and the workpieces with large aspect ratio (L/D) are turned or ground. This workshop may only need to consume several center drills per month. Solid carbide center drills are more expensive and may be more attractive for high-volume machining, which can be machined at higher cutting speeds and feed rates for longer tool life. However, both types of center drills must be subjected to some measurement when replacing a worn drill bit so that the newly changed drill bit can be drilled to the appropriate depth (this measurement may be performed using a tool presetter or in-process inspection). The device is completed). For example, in order to ensure that the grinding wheel of the grinding machine does not affect the shoulder or other features of the workpiece, causing the workpiece to be scrapped, it is important to maintain the specified center hole depth throughout the machining process.
Taiwan's Nine9 company's newly developed indexable insert center drill can replace the above two kinds of drill bits. Because the drill does not need to be measured when changing the tool, the machining assist time is greatly shortened, which is very suitable for the production environment of efficient machining. The company's "i-center" drill bit is said to be the industry's first indexable insert center drill, which successfully replicates the drilling performance advantages of solid carbide drills with the high positioning of indexable tools. The sex and quick change functions are integrated. This new type of drill is suitable for high-volume turning or grinding of various components such as transmission parts, crankshafts, motion control shafts, etc.
The i-center center drill uses a standard insert that provides two drilling cutting edges. The blade is positioned with two locating pins machined to match the shank and fastened with a torx screw. The axial positioning accuracy between the cutting edge of the blade and the cutting edge is 0.05 mm, and the radial positioning accuracy is 0.02 mm. Such high positioning accuracy eliminates the need to re-measure after the blade is indexed or replaced. The I-center shank is made of hardened high-alloy steel and has an internal cooling channel that delivers high-pressure coolant to the tip of the insert. This design helps to increase cutting speed and extend tool life while preventing the formation of "bird's nest" shaped chips.
The i-center center drill has two cutting edges on each drill tip and is designed with a chip evacuation port to facilitate chip evacuation. This design produces a high-quality hole with a smooth hole wall and helps prevent the blade tip from collapsing due to overheating (this is the most common failure mode for center drills). The i-center insert features two effective sipe designs and offers a machined hole diameter range of 2-10mm. Standard shapes for inserts include ANSI 60°, DIN332 Form R and DIN332 Form A+B (special shape inserts are also available). The insert features a K20F carbide substrate and a TiAlN coating specifically designed for center hole machining. This drill is ideal for drilling cast iron, carbon steel/alloy steel, aluminum/aluminum alloys and copper/copper alloys.
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