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Holders, balancing machines, thermal machines and accessories manufacturer HAIMER GMBH company at its own production site for a study on the benefits of using the balancing machine handle internal case studies. The company found that, according to the different processing centers in shifts. Each machining center cost savings per year from 20,000 to 40,000 US dollars. By balancing the insertion tool shank and spindle life can be extended twice, cutting the amount increased by 10%, tool life is also extended by 10% in addition. Surface quality and accuracy is improved, flutter and waste reduction. Simultaneously. Tests showed. At any speed (r / min) range, balance tools produce positive results in the high-speed machine tools, especially the spindle speed is greater than the maximum benefit 8000r / min high-speed balancing machines obtained from the tool.
Mr. Michael Layne Hoffman's product manager for the United States in a white paper, said: "Only an unbalanced balance 1.0gm-mm good) handle when speed 15,000r / min, will produce 0.56 lbs (about 2.49 Newton, cutting technology website Note) radial force. when the researchers handle and balance requirements, we found that the average initial CAT-50 handle the imbalance is 250gm-mm. when speed 15,000r / min, 250gm-mm of unbalance will produce up to 140 pounds (about 623 Newton, cutting technology website Note) continuous radial force!. " This white paper is the name of the "detection and correction in high-speed machining handle imbalance" is Layne their companies - American Precision Balancing Machine Manufacturer Hoffman written by the company.Layne said, because the movement of the cutting tool, the tool imbalance will lead to quite vibration and form a surface corrugation. High frequency chatter will cause poor surface finish. Unbalance will cause abnormal tight tolerances can not be maintained. So that the rejection rate increase.
On the machine spindle imbalance will cause premature bearing failure, resulting in costly downtime. Several major manufacturers handle recent studies show that the balance of the tool shank, the tool life can be extended to 50%. Knives, knife handle and stopper knob (if applicable) should be used as a component to balance. However, not all tools are required balance. Should be a process of each tool are evaluated to determine whether the application needs to be adjusted, close tolerance balance. Should consider the tool speed (r / min), the weight of the tool, tool operation and stress exerted on the spindle.
It causes an imbalance may come from factors inherent. Including the shank features may also come from random causes, such as set screws or chuck chuck position screw position, or cutting tools, or use the handle on the end mill. Imbalance inherent factors usually made from shank manufacturer be resolved through design and pre-equilibrated. Random reason may replace each cutter or when the chuck is released and re-tight will change. Not handle moving parts. Such as heat shrinkable handle, when its pre-equilibrium, often not easy to lose its balance. Hydraulic chuck is also easy to balance, in use, it is easy to regain balance.
Regardless of the type of spindle speed and tool holders used, the internal balance of the project with the shank of the tool, can reduce the cost and maintain the tight tolerances and other incidental benefits, will soon be able to get return on investment.
