Determination of energy-efficient technologies for the assembly of press joints

Abstract

The article deals with the issues of determining the energy-economic method of the technological process of assembling press (with tension) connections. It is shown that the energy intensity of processes depends on the geometric dimensions of the parts, the structure of the technological process and the tension in the joint.

Technological design of press compounds should be considered first of all with respect to pressing technologies and using induction heating. Pressing provides, under other equal conditions, less durability of the connection than the addition with heating, but it is less energy-intensive. At high contact pressure, in the contact details, due to the high tension, when pressed on the landing surfaces there are plastic deformations that lead to the formation of risks or even zadirov. A large tension when combined with heating requires a higher temperature of heating. The dependence of the required temperature of heating of parts from steel, from the landing diameter of the connection is shown.

The graphs of the dependence of the required temperature difference for the considered landings are presented. It is shown that the heating temperatures of parts are significant for connections with small seat diameters. This is due not only to relatively large tensions, but also to relatively large thermal gaps. Thus, connections with small diameter and thick-walled covering parts for all types of landing with a tension for qualitative characteristics are in the risk zone. Reducing the necessary gap by further refinement of technical assembly systems will make it possible to collect with heating connections with diameters less than 100 mm.

Summarizing the data obtained for different landings of steel joints with a piston shaft, it is possible to determine the areas of priority application of pre-compression or pre-heating technologies. The level of energy consumption can be reduced to the maximum, both at the expense of economic equipment and at the expense of economic technology.