Abstract: Vibration damping and sound absorbing foam formed of foam and fine particles present inside the foam so as to form bell-like structures in the foam is produced by performing the following steps [I] to [III] in the stated order. [I] Producing fine particles each having a surface coated with a coating material capable of being dissolved in at least one liquid selected from water and a solvent. [II] Mixing the coated fine particles into a material for foam, and producing foam from the mixture. [III] Immersing the foam in at least one liquid selected from water and a solvent to remove the coating of each of the fine particles in the foam by dissolution in the liquid.

Abstract: Vibration damping and sound absorbing foam formed of foam and fine particles present inside the foam so as to form bell-like structures having communication paths to a surface of the foam is produced by performing the following steps [I] to [III] in the stated order. [I] Preparing foam having foamed cells inside the foam and having communication paths to the foamed cells on a surface thereof, and fine particles each having a particle diameter smaller than a cell diameter of each of the foamed cells and larger than a diameter of each of the communication paths. [II] Swelling the foam to enlarge the diameter of each of the communication paths, and then sprinkling the surface of the foam with the fine particles, followed by pushing of the fine particles into the foamed cells via the communication paths with a fluid pressure of a liquid. [III] Drying the foam.

Abstract: A method for designing cutting conditions for cutting a workpiece with a cutting tool uses design parameters, including a feed speed, an axial direction cutting amount, a radial direction cutting amount, and a cutting speed of/by the cutting tool. A deflection amount of the cutting tool is calculated from the design parameters. Then a “chattering vibration” occurs or not in the cutting tool is determined. Depending on the determination result, a maximum cutting thickness of the workpiece is calculated. Then a cutting temperature of the cutting tool is calculated. Then whether a tool life of the cutting tool is satisfied or not is determined. Depending on the determination result, a cutting efficiency of the cutting tool is calculated and compared with data of a cutting efficiency stored in advance. When the calculated cutting efficiency is a maximum value among the data, the design parameters are used as the cutting conditions.

Abstract: A method for designing cutting conditions for cutting a workpiece with a cutting tool uses design parameters, including a feed speed, an axial direction cutting amount, a radial direction cutting amount, and a cutting speed of/by the cutting tool. A deflection amount of the cutting tool is calculated from the design parameters. Then a “chattering vibration” occurs or not in the cutting tool is determined. Depending on the determination result, a maximum cutting thickness of the workpiece is calculated. Then a cutting temperature of the cutting tool is calculated. Then whether a tool life of the cutting tool is satisfied or not is determined. Depending on the determination result, a cutting efficiency of the cutting tool is calculated and compared with data of a cutting efficiency stored in advance. When the calculated cutting efficiency is a maximum value among the data, the design parameters are used as the cutting conditions.