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Additive manufacturing of metal parts occupies an increasing number of areas of mechanical engineering, but still remains too expensive for mass use. Based on the experience in the production of combined metal-metal polymer forming parts of molds, a new method for the production of composite parts from a metal shell filled with metal polymer is proposed. The strength calculations by the finite element method of the exoskeleton part and a sample of simplified geometry are given as the basis of the study. A comparison of the strength characteristics of parts made of various materials and their combinations showed high strength characteristics of a composite part made of a metal shell and a metal polymer filler. The metal-metal polymer composite part is distinguished not only by its high strength, but also by a significantly lower cost due to the reduction in the volume of 3D printing with metal. The article substantiates the main problems facing researchers and technologists in the development of a practically applicable technology for producing such composite parts.

Vibration machines make up a large class of construction and road construction equipment. The improvement of vibration machines is carried out in the direction of improving the vibration device as the main working body of the machine. For a long time, vibrators with circular vibrations are used as vibration devices, the effectiveness of which is not always sufficient when performing special work on immersing piles into and removing them from the soil. The priority area of development and creation of vibration devices for technological processes in the coming years is mechanisms with asymmetric oscillations. Vibration devices with asymmetric oscillations can significantly increase the efficiency of using vibration machines due to the fact that the driving force aimed at performing useful work exceeds the magnitude of the driving force directed at idling several times. However, at present there is no method for determining and calculating the parameters of vibration devices with asymmetric oscillations instead of circular vibrators. The purpose of the article is to consider a method for designing vibrational devices with asymmetric oscillations, based on the method of expanding a given function of changing the value of the total driving force into a Fourier series, the terms of which are the values of the driving forces generated by each stage of a multi-stage vibration mechanism. The study is based on classical analytical and numerical methods. The results obtained allows to use the methodology for evaluating the design method of a vibration device with asymmetric vibrations at the design stage and to evaluate the effectiveness of the designed vibration device.

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