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The measuring results of plating thickness and chromium plating input parameters.
Source publication
The relevance of studying product quality control as based on optimization of process input values parameters is shown. The paper explores the tolerance synthesis method of technological process input parameters based on regression dependences. Electrolytic chromium plating process simulation has been performed enabling to optimize input parameter...
Citations
... The matrix modification technique is limited to an oxidation resistance temperature of about 1000 C after the addition of oxidation inhibitors, and high temperature oxidation protection must be achieved by the antioxidant coating method [17][18][19]. So far, the preparation methods of antioxidant coatings on the surface of C/C composites mainly include chemical vapour deposition (CVI), electroplating [20], reactive melt infiltration (RMI), painting, plasma spraying (APS) [21], sol-gel (Sol-Gel), precursor impregnation-cleavage (PIP), thermal spraying [22], etc. And these preparation processes have some problems, such as long preparation cycle, low bonding strength of substrate and coating, and inability to readily repair the coating locally. ...
Prefabricated MAX (Ti 3 SiC 2 , Ti 3 AlC 2) phase coating materials with coefficient of thermal expansion Si and SiC as transition layers and excellent high-temperature antioxidant properties were used for ultra-high-speed laser melting on the surface of carbon/carbon composites, so that the produced coatings have good interfacial bonding and high-temperature antioxidant properties. In this study, we characterised and analysed the microscopic morphology and composition of the sample coatings using X-ray diffraction and scanning electron microscopy, investigated their interfacial bonding properties by scratch tests and studied the high temperature oxidation resistance of the samples at 1773 K for 1 h. The results show that the bonding strength between the coating and the substrate is good, the surface is flat without flaking, the coating thickness can be controlled below 60 m, the microstructure is dense, and there is no obvious deformation or failure of the substrate, and the dense coating formed by laser melting has strong oxidation resistance, so that the substrate carbon/carbon composite is well protected at high temperature.
... Considering the processes of design, manufacture, and operation of process equipment, G. Taguchi identified three main stages [1]: structural (functional) synthesis; parametric synthesis; synthesis tolerances. The development of G. Taguchi's ideas on the choice of operating conditions for technological equipment, reducing the variation in the quality indicators of its products, has generated an increased interest in optimizing tolerances when designing machines [2][3][4][5][6][7]. The classical formulation of the problem of multi-criteria parametric optimization is: ...
The paper is devoted to the topical issue of the formation of a variation method for calculating the accuracy of metal cutting systems. The current state of the basic variation method for calculating the geometric accuracy of metal cutting machines is determined. A transition from considering the geometric accuracy of only the metal cutting machine to considering the accuracy of the metal cutting system is made, which includes the metal cutting tool. The proposed directions for the development of the method are recommended to be divided into groups according to the criterion of linearized and non-linear formulation when building accuracy balances. The solution of the problem posed in the paper serves as a methodological basis for work on normalization and compensation of geometrical errors of machine tools, including the creation of the foundations of standards for the accuracy of metal-cutting machines and tools. This work is useful for scientists engaged in the study of the geometric accuracy of processing on metal-cutting machines, as well as the normalization and compensation of the geometric errors of machines.
... Using the approach stated in [6] we will define a full variation of expression (2): ...
The bases of a variation method to calculate the metal-cutting systems accuracy for the first time are systemically stated in this paper. The main attention is paid to a problem of joint influence of geometrical accuracy of machine tools and cutting tools parameters on the details processed surfaces accuracy. The general mathematical model of metal-cutting systems accuracy is presented in this work. The general model is the basis to develop the full mathematical model of turning metal-cutting system accuracy. The results of accuracy modeling at turning with a wide cutter are received when studying nature of influence of the lathe and the cutting tool geometrical errors on processing accuracy of cylindrical and face surfaces. The directions of further researches in the field of calculations of metal-cutting systems accuracy at difficult surfaces processing by the shaped cutting tool and also when accounting rigidity of the systems elements and the proceeding processes are revealed in the presented work.
The study results of the zinc coating obtained on the surface of metals in the process of mechanochemical synthesis, implemented in the conditions of vibrowave systems, are presented. The features of coating formation mechanism, an activating role in its formation of free-moving, under the influence of low-frequency vibrations, indenters, are disclosed. The advantages of applying zinc coatings method in comparison with traditional methods are shown.
The given work represents research results of the metal coating transition zone and adsorption on the zinc coating quality fulfilled under the conditions of vibro wave technological systems. The peculiarities of the metal-coating transition zone are shown. A spectral image of the metal-coating transition zone is widely researched.
The results of investigations of zinc coatings obtained on the surface of metals in the process of mechanochemical synthesis realized in conditions of vibro-wave technological systems (VTS) are presented. The features of the morphology of the coating structure are revealed, which activates the role of indents in the formation of free-moving vibrations under the influence of low-frequency oscillations, and its influence on increasing the operational properties of the surface layer of the parts. The advantages of this method of applying zinc coatings in comparison with traditional methods are shown.
The results of investigations of zinc coatings obtained on the surface of metals in the process of mechanochemical synthesis realized in conditions of vibro-wave technological systems (VTS) are presented. The features of the morphology of the coating structure are revealed, which activates the role of indents in the formation of free-moving vibrations under the influence of low-frequency oscillations, and its influence on increasing the operational properties of the surface layer of the parts. The advantages of this method of applying zinc coatings in comparison with traditional methods are shown.
