The drilling accuracy is low, generally only IT13~IT11, and the surface roughness is also relatively large, Ra is generally 50~12.5 m. But the drilling metal removal rate is high, and the cutting efficiency is high. Drilling is mainly used to process holes with low quality requirements, such as bolt holes, threaded bottom holes, and oil holes. For holes that require high machining accuracy and surface quality, they should be realized by reaming, boring or grinding in the subsequent processing. See full list on Reaming is a cutting process that involves using a rotating cutting tool to create a smooth inner wall in an existing hole in a workpiece. Rotary cutting tools used for reaming are called reamers. Like drill bits, reamers can also remove material from the work piece on which they are used. However, the reamer removes much less material than the drill bit. The main purpose of reaming is to create smooth walls in existing holes. Reaming is a finishing method for holes on the basis of semi-finishing (reaming or semi-finishing boring). Compared with grind boring, reaming productivity is high, and the accuracy of the hole is easily guaranteed. However, reaming cannot correct the position error of the hole axis, and the position accuracy of the hole should be guaranteed by the previous process. The size tolerance of the reaming hole can reach IT9~IT6, and the surface roughness value can reach Ra3.2~0.2μm. See full list on Boring is a cutting process that involves the use of a single-point cutting tool or boring head to enlarge an existing hole in a workpiece. This is in sharp contrast to drilling, which is to create an initial hole in the workpiece. The boring hole diameter is not limited by the tool size, and the boring error correction ability is strong. Multiple cutting can correct the deviation error of the original hole axis, and the boring hole is consistent with the positioning surface. High positioning accuracy. The processing range of boring is very wide, and holes of different sizes and different accuracy levels can be processed. For holes and hole series that require large diameter, size and position accuracy, boring is a good processing method. The boring accuracy is IT9~IT7, and the surface roughness is Ra 3.2~0.8m. Boring can be used in boring machines, lathes, milling machines and other machine tools, with strong flexibility and wide production applications. See full list on Honing is the use of a hoad with a honing rod to polish the hole. Honing has a wide range of applications. It can process cast iron, hardened and unhardened steel, bronze, etc., but it is not suitable for processing plastic metals that are easy to block oilstone. The diameter of honing process is Φ5~Φ500mm, and deep holes with L/D>10 can also be processed. Therefore, it is widely used to process engine cylinders, hydraulic cylinders and various barrel holes. See full list on
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