What Causes Vibration in a CNC Lathe's Dual Spindles? Dual spindles may experience some degree of vibration during the machining process. Therefore, to effectively prevent all machining inaccuracies, it is necessary to control and avoid vibration during the machining process.
1. The cutting force of a sharp blade reduces the coating and coating wear on the double-spindle machine's blade holder blade. Coated blades are typically sharper than uncoated blades, as if you want to apply paint to the blade, its sharp edge must be blunted. A sharp edge would affect the bonding strength of the edge area where the coating is applied.
When the cutting depth is constant, using a small tip arc radius undoubtedly reduces the cutting force, particularly the radial cutting force, which is a major cause of vibration in slender rod cutting tools or workpieces, whether it's collision or milling. At the same cutting depth, a larger tip arc radius on the tool tends to cause greater vibration in slender rods.
3. Selectable cutting depth. Avoid cutting depth equal to the radius of the blade's arc.
4. When performing key cutting on sharp cutting tools using slender tool rods, or external cylindrical turning on slender shafts, use a 90-degree angle. Tools with a main cutting edge have excellent vibration damping effects. Whether it's external cylindrical turning of slender shafts or the critical hole of a slender tool rod, always maintain a 90-degree angle. Tools with a main cutting edge generate the smallest radial cutting force. At the same time, the blade edge produces the largest axial force.
5. For slender rod cutters, round knives are beneficial in reducing vibration. Milling cutters and agitators, with their primary angles mostly at 90 degrees, experience greater radial cutting force which leads to more significant cutter rod vibration. Therefore, during the deep hole mold cavity face milling process on CNC milling machines, a 45-degree primary angle milling cutter is typically used. If the cutting depth is less than 1mm, round edge or ball end milling cutters are generally employed.
6. The dual-spindle cutting utilizes long, slender rod end milling cutters for deep cavity machining. Milling is a commonly used cutting method. The milling cutter advances axially like a drill bit, and when machining deep cavities, the smaller the cutting edge angle during boring, the better. This results in a significantly large secondary main deflection angle, with a minimal contact area between the secondary cutting edge and the work surface, making vibration difficult to convert. Additionally, there are fewer opportunities for the secondary cutting edge to extrude chips.
Effectively improving the vibration situation during the double-spindle machining process can significantly enhance the equipment's efficiency and also have a positive impact on the precision of the machine. We hope this introduction can be helpful for your future use.
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