Investigation of structural cast iron hardness for castings of automobile industry on the basis of construction and analysis of regression equation in the factor space «carbon (C) - carbon equivalent (Ceq)»
Journal Title: Технологический аудит и резервы производства - Year 2018, Vol 3, Issue 1
Abstract
<p><em>The object of research is structural iron with lamellar graphite, in which the carbon equivalent (C<sub>eq</sub>) is in the range (4.2–4.4) %, and the carbon content (C) in the range (3.42–3.57) %. The aim of research is description of the distribution of the hardness value of structural cast iron of serial meltings in the C–C<sub>eq</sub> factor space at fixed values of the Cr–Ni–Cu–Ti alloy content in narrow intervals. It is shown that a polynomial regression equation of the form HB=HB(C, C<sub>eq</sub>) can be used to obtain a workable analytical description. It is shown that such structure of the equation and those obtained by the method of least squares corresponding coefficient estimates provide 92 % accuracy of the forecast even with a small sample of data.</em></p><p><em>On the basis of the canonical transformation of the response surface and its ridge analysis, it is established that it is possible in principle to satisfy different requirements for hardness. So, if the range of the planning area C=(3.42–3.57) % and C<sub>eq</sub>=(4.2–4.4) % is chosen as the imposed constraint, then several suboptimal solutions are possible. This is the case if the task of minimizing hardness is not set and the range HB=180–250 satisfies the quality requirements specified by the production conditions. If the priority is hardness minimization, then the suboptimal solution is one and it is like the point of intersection of the constraint line (r=1.414) and the lower ridge line y=y(r). On the basis of this, it is concluded that the suboptimal solutions are multivariant, depending on the requirements of production. A nomogram has been constructed, which makes it possible to select in a rational way the technological regimes of out-of-furnace treatment in the part concerning the adjustment of the chemical composition of the alloy.</em></p>
Authors and Affiliations
Dmitriy Demin
Keywords
Related Articles
- EP ID EP527409
- DOI 10.15587/2312-8372.2018.109097
- Views 113
- Downloads 0
Modeling of parameters of pipelines of central water heating system and thermal insulation of the facade of Ukrainian buildings and facilities for different climatic conditions
<p><em>The object of research is the design parameters and material for the execution of the elements of the complex thermomodernization of a building or structures, namely the system of central water heating and facade...
Analysis of possibilities to use neural network for remote control of electronic devices
<p><em>The object of research in the work is the systems of remote control of electronic devices. There are wired and wireless means of implementing a remote communication channel between the slave and control devices. A...
Correction of technological characteristics of protein-fat mixture by expanding the component composition
<p><em>The object of research is the technological characteristics of the protein-fat mixture of increased nutritional value, depending on the addition of vegetable oil as a component. The protein-fat mixture is a mixtur...
Bioindicative studies of roadside ecosystems
<p class="20CxSpFirst">The object of the research is the ecosystems that are directly adjacent to the Ukrainian highways of interstate, state and regional importance. The areas on the roads М02, М03, Н07, Н12 and Р44 wer...
Substantiation of proposals on the use of insulating apparatus in the liquidation of emergencies with the release of hazardous chemicals
<p class="FR1"><em>In work, the technical possibilities of using personal respiratory protective equipment are considered as an object of research. Such funds are used in fire and rescue units, during emergency rescue op...