Boring tools are important in machine tool equipment. There are divided into round tool holders and square tool holders. Square types are usually used to process large parts and workpieces with strong hardness. The most used occasion is inner holes. Machining, enlarging, profiling, etc., and using existing holes for roughing, semi-finishing or finishing. Boring is one of the important processing contents of the boring tool. Boring can accurately ensure the dimensional accuracy and shape accuracy of the hole system, and correct the errors in the previous process. Most of the cylindrical holes processed by boring are the main matching holes or support holes in machine parts, so they have high dimensional accuracy requirements. Generally, the dimensional accuracy of mating holes is required to be controlled at IT7 ~ IT8. For the holes of brackets, sleeve parts and important holes of box parts with higher precision requirements, the shape accuracy should be controlled at 1/2 ~ 1 of the aperture tolerance. /3. The hole spacing error of boring holes is generally controlled at ± 0.025 ~ 0.06 mm, and the parallelism error of the two hole axis lines is controlled at 0.03 ~ 0.10 mm. The surface roughness of boring is generally Ra1.6~0.4 μm. In order to control the machining accuracy and reduce errors, the boring method is particularly important. ANTISHICNC has compiled the following three methods for you:
Boring hole processing method
1.Single edge boring-tool rough boring
Rough boring is an important process for boring cylindrical holes. It mainly pre-processes the rough hole (cast or forged hole) of the workpiece or the drilled or enlarged hole to prepare for the next step of semi-finish boring and fine boring. It is required to lay a foundation and be able to detect defects in the blank (cracks, sand inclusions, blisters, etc.) in a timely manner. After rough boring, 2 to 3 mm on one side is generally left as a margin for semi-finish boring and fine boring. For precision box workpieces, tempering or aging treatment should generally be arranged after rough boring to eliminate the internal stress generated during rough boring, and finally fine boring should be performed. Due to the large cutting amount used in rough boring, the cutting force generated in rough boring is high, the cutting temperature is high, and the tool wear is serious. In order to ensure the productivity of rough boring and a certain boring accuracy, it is required that the rough boring tool should have sufficient strength, be able to withstand large cutting forces, and have good impact resistance; rough boring requires the boring tool to have a suitable geometric angle. , to reduce the cutting force and facilitate the heat dissipation of the boring tool.
2.Semi-precision boring
Semi-finish boring is a preparatory process for fine boring. It is mainly used to solve the uneven remaining balance during rough boring. For holes with high precision requirements, semi-finish boring is generally performed in two steps: the first time is mainly to remove the uneven portion left during rough boring; the second time is to boring the remaining allowance to improve the hole quality. Dimensional accuracy, shape accuracy and reduced surface roughness. After semi-finish boring, the fine boring allowance is generally 0.3 ~ 0.4 mm (single side). For holes with low accuracy requirements, fine boring can be performed directly after rough boring without the need for a semi-finish boring process.
3.Precision boring
Fine boring is based on rough boring and semi-finish boring, using higher boring cutter speed and smaller feed amount to cut off the small margin left by rough boring or semi-fine boring, so as to accurately meet the requirements specified in the drawing. inner hole surface. After rough boring, the clamping plate should be loosened and then clamped again to reduce the impact of clamping deformation on machining accuracy. Usually the cutting amount of fine boring back is ≤0.01mm, and the feed amount is ≥0.05 mm/r.
Tags：boring tool/boring cutter，boring tool holder，boring machine tool
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