The boring is a further processing of the forging, casting or drilling holes, the boring can enlarge the aperture, improve the precision, reduce the surface roughness, and can better correct the deflection of the original hole axis. Pupils can be divided into rough, semi-precision and fine. The precision of the precision hole can reach IT8~IT7, and the surface roughness Ra value is 1.6~0.8μm.
The boring is a further processing of the forging, casting or drilling holes, the boring can enlarge the aperture, improve the precision, reduce the surface roughness, and can better correct the deflection of the original hole axis. Pupils can be divided into rough, semi-precision and fine. The precision of the precision hole can reach IT8~IT7, and the surface roughness Ra value is 1.6~0.8μm.
The pupils are divided into general pupils and deep-hole pupils. Generally, the pupils can be used in ordinary lathes. The files can be fixed on the lathe tailstock or fixed on the small knife holder. The deep hole boring requires a special deep hole drilling and boring machine. The boring tool should be added with a stalk, and the hydraulic pumping station should use the coolant to remove the iron filings.
First, commonly used sickle
1. Common boring tool for through hole boring and boring hole, in order to reduce the radial cutting component, to reduce the bending deformation of the arbor, the general lead angle is 45 ° ~ 75 °, often take 60 ° ~ 70 ° .
2. The boring tool for the stepped hole and the non-through hole, the main deflection angle is greater than 90°, generally 95~100°, and the width of the cutter head should be smaller than the radius of the hole.
Second, the installation of the file
1. The length of the shank extending beyond the shank should be as short as possible to increase the rigidity and avoid the cone distortion caused by the bending deformation of the shank.
2. The tip of the tool should be slightly higher than the center of rotation of the workpiece to reduce the vibration and the phenomenon of the knife, to prevent the lower part of the file from damaging the hole wall and affect the machining accuracy.
3. The shank should be installed correctly and should not be skewed to prevent the shank from damaging the machined surface.
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