In the manufacturing of thin-walled cups by metal forming processes, the use of high-viscosity lubricants, which would inevitably require strong and non-environmentally friendly degreasing agents such as fluorocarbons or 1,1,1-trichloroethane, has been restricted in order to reduce environmental pollution. This problem can be solved, for example, by using low-viscosity lubricants such as water-soluble oil. However, this generally results in poor forming (e.g. ironing) performance which must be solved in some other way. We therefore attempt to apply ultrasonic vibration to dies for ironing processes both in the axial and radial directions in an effort to improve die lubricity. From the experiments using aluminum and steel workpieces, it is found that in the case of radial vibration ironing, despite the use of low-viscosity lubricants, the limiting reduction ratio of wall thickness (LRRWT)
| Number of Pages : | 6 |
| Published : | 11/01/1999 |
