Abstract <p>The thermal interaction of a cutter, chips and a workpiece during milling using ultrasonic vibrations (UV) is studied. Boundary conditions of the second and third kind are developed for different moments of contact of the cutter tooth with the workpiece. Numerical modeling of the force and temperature parameters of the milling process during treatment with and without UV is performed. Dependences of the change in the parameters under study on the time of contact of the tooth with the workpiece and the oscillation phase when using UV are obtained. It is shown that an important factor influencing on the treatment parameters is the friction coefficient. UV reduces friction and cutting forces, heat generation and temperature in the contact zone of the cutter with the workpiece and chips. The temperature distribution in the surface layer of the workpiece during treatment is established.</p>