Stainless steel drilling processing common problems and matters needing attention?
Jun 30, 2022
In the drilling process due to poor thermal conductivity of stainless steel materials, elastic modulus is small, material hardness factors, resulting in higher difficulty of drilling processing, to solve the drilling problems of this kind of material, need to be considered from multiple aspects, the following is a brief introduction to the stainless steel drilling processing to pay attention to what problems:
(1) Tool material selection
Due to the processing of stainless steel parts with large cutting force, cutting temperature is high, often can use CBN (cubic boron nitride) blade, is second only to diamond, CBN hardness hardness is up to 7000 ~ 8000 hv, so wear resistance is very high, compared with diamond, CBN outstanding advantage is heat resistance is much taller than diamond, up to 1200 ℃, can withstand high cutting temperature. In addition, its chemical inertia is very large, and iron group metal in 1200 ~ 1300℃ also does not have chemical action, so it is very suitable for processing stainless steel materials.
(2) Tool geometric parameters
The tool geometric parameters play an important role in its cutting performance. In order to make the cutting light and smooth, the carbide tool should use a larger rake Angle to improve the tool life. In general rough machining, the front Angle is 10° ~ 20°, and the semi-finishing Angle is 15° ~ 20°; When finishing, take 20° ~ 30°. The selection of the main deflection Angle is based on 30° ~ 45° when the process system is good rigidity; If the rigidity of the process system is poor, take 60 ~ 75°, when the ratio of the length and diameter of the workpiece is more than 10 times, take 90°.
When boring stainless steel material with ceramic cutter, in most cases, ceramic cutter adopts negative rake Angle for cutting. The front Angle should be -5° ~ -12°. This is beneficial to strengthen the blade and give full play to the advantages of ceramic cutting tools with high compressive strength. The size of the back Angle directly affects the tool wear, also has an impact on the blade strength, generally choose 5° ~ 12°. The change of the main deflection Angle will affect the change of the radial and axial cutting forces as well as the cutting width and cutting thickness. Because the vibration of the process system is very unfavorable to the ceramic tool, the selection of the main deflection Angle is conducive to reducing the vibration, generally 30° ~ 75°. When CBN is used as the tool material, the tool geometric parameters are 0° ~ 10° front Angle, 12° ~ 20° rear Angle, 45° ~ 90° main Angle.
(3) Pay attention to the grinding of the chip breaker
Because the stainless steel chip has the characteristics of toughness, the chip breaking groove on the front of the tool should be suitable for grinding, so as to make the process of chip interruption, chip tolerance, chip discharge convenient.
(4) Select the appropriate cutting oil
Because stainless steel has the characteristics of easy to produce bond and poor heat dissipation, so in the boring selection of anti bond and good heat dissipation cutting oil is very important, good performance of cutting oil can not only greatly improve efficiency, but also can effectively protect the tool, prolong the service life of equipment.
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