卷 37, 编号 8 (2017)

The use of CALS technology in the development and preproduction of the SSJ100 airplane is outlined.

The finite-element method is used to investigate the elastic surface displacement of a hole reamed in a lug at points where the radial cutting force is applied. On that basis, formulas are derived for determining the distortion of the machined hole surface, with allowance for all the relevant factors.

Simulation of the business process in manufacturing is considered. The main attributes and stages of the business process are described. For the example of automated machining, the business process is broken down into its components. A logical relation is established between the subprocesses (functions). Their inputs and outputs controlling the implementation of the process are described. A process model of digital manufacturing is developed in the methodology of the IDEF0 standard.

Means of increasing machine-tool reliability are considered. In particular, systems for monitoring machine tools are developed on the basis of the e-Mind Machine module and an expert system for flexible maintenance.

The influence of the surface roughness of the electrode tool on the productivity in electric discharge machining of 38Х2Н2МА steel is investigated. In the finishing of 38Х2Н2МА steel, there is no need to use electrode tools with surface microprojections shorter than 1.1 μm in order to ensure that the roughness of the machined surface corresponds to microprojections of height 1.1–1.6 μm. In practice, the manufacture of electrode tools with microprojections smaller than 1.1 μm is uneconomical.

A model is proposed for determining the geometric parameters in the mating of parts with conical surfaces that include shape errors. Theoretical and experimental results on the mating of such parts are presented.

The productivity in abrasive water-jet machining of titanium alloys and heat-resistant alloys is discussed. Empirical formulas for the rate of metal removal as a function of the machining parameters are presented.

In the rotation of an excavator platform, energy is mostly consumed in acceleration and deceleration. The energy consumed in platform rotation may be reduced by uniform redistribution of the load over the whole contact surface, with equalization of the time of load action.

To determine the stress–strain state of housings and instruments, a module based on a tensometric sensor is developed and used in experiments. The experimental results are compared with the values obtained in a standard experiment on laboratory equipment. The applicability and adaptability of the new module are confirmed.

Computer simulation of the stress–strain state of graphite blocks in prolonged thermal and neutron irradiation is considered, in a three-dimensional formulation. Allowance is made for the anisotropy of the graphite’s thermophysical properties, as well as crack initiation and growth. Creep of the material is taken into account, in the absence of plastic deformation, and its influence on the properties of the graphite blocks is assessed.