The so-called deep hole drilling is a hole whose length: diameter is greater than 6. Deep hole processing generally deep hole in most cases the ratio of depth to diameter L/d≥100. such as cylinder hole, axial oil hole of shaft, hollow spindle hole and hydraulic valve hole, etc. Some of these holes require high machining accuracy and surface quality, and some of the machined materials have poor machinability, which is often a difficult problem in production.
Process characteristics
1. The tool rod is limited by the aperture, the diameter is small and the length is large, which results in poor rigidity and low strength. it is easy to produce vibration, ripple and taper when cutting, which affects the straightness and surface roughness of the deep hole.
2. In drilling and reaming, the cooling lubricating fluid is difficult to input into the cutting area without special device, which reduces the tool durability and chip removal.
3. In the process of deep hole machining, the cutting condition of the cutting tool can not be observed directly, and the cutting process can only be judged according to the working experience to listen to the sound of the cutting, to see the chips, the hand touch vibration and the workpiece temperature, and to watch the instrument (oil pressure meter and electric meter) to judge whether the cutting process is normal or not.
4. Chip removal is difficult, it is necessary to use reliable means to break chip and control the length and shape of chip, so as to facilitate smooth removal and prevent chip clogging.
5. In order to ensure the smooth progress of the deep hole in the machining process and to achieve the required machining quality, the chip removal device inside (or outside) the tool, the tool guide and support device and the high pressure cooling lubrication device should be added.
6. The tool heat dissipation condition is poor, the cutting temperature rises, causes the tool durability to reduce.
Deep hole processing has been widely used in mould industry, which solves the fine hole and long hole which can not be solved by ordinary drilling machine in die processing. Effectively reduce the processing cost of the mold. Undertake the most sophisticated deep hole processing, aperture 3-35 length can achieve 2600. The water hole, oil hole, air hole, single oblique hole, double oblique hole, wire crossing hole and top pinhole are solved to the maximum extent.
