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Vol 36, No 2 (2016)
- Year: 2016
- Articles: 23
- URL: https://journals.rcsi.science/1068-798X/issue/view/13920
Article
Shaping of Heat-Exchanger Pins by Deformational Cutting
Abstract
The use of a metal plate to simulate pin shaping by deformational cutting is proposed. The influence of the tool geometry on the volume of material removed to form a single pin is considered. Analytical formulas for the cutting angle and the pin length are derived. Experimental data regarding the influence of the cutting parameters on the shape and alignment of the pins are presented
81-85
Balancing Parameters for a Storage Battery
Abstract
Means of improving the operational safety and life of rechargeable batteries in hybrid power units and electric vehicles are considered. Passive and active balancing of the storage cells in the battery is investigated. A method of establishing the balancing parameters is proposed.
86-88
89-92
93-95
96-99
Electromechanical Hardening of Nanostructured Alloy Layers Applied in Surfacing
Abstract
Electromechanical hardening of applied surface layers of thermostable and wear-resistant iron and ferronickel alloys modified by ultrafine TiCN and WC particles is considered; the ferronickel alloy contains γ′-Ni3Al phase. The dependence of the microhardness and the depth of the hardened layer on the current is established.
100-104
Turbines for Water-Heating Boilers in a Thermoelectric Plant
Abstract
The turbine rotor of a system operating on the basis of the organic Rankine cycle may be analyzed by means of approximate coefficients in the polynomial describing the isobaric specific heat of Freon R245fa as a function of the temperature. Calculation of the energy balance confirms the applicability of such systems.
105-108
109-111
112-115
116-118
119-121
122-125
Smart Control and Product Quality
Abstract
Smart control of production in accordance with State Standard GOST R ISO 9004—2010 is based on decisions regarding the modification of the process, its structure, and the control programs for the equipment. A smart system for use in preproduction may be developed on the basis of decision-making support and quality assurance.
126-128
A Machine Tool with Parallel Two-Level Kinematics
Abstract
A triaxial machine tool with parallel kinematic structure is described. Equations for solving inverse and direct kinematics problems in terms of the position are presented. The influence of the drives’ positioning errors on the maximum tool deviation from the intended position at characteristic points of the working space is analyzed.
129-133
134-137
Influence of the Machine Tool’s Dynamic System on the Product Quality
Abstract
The trajectory of a fixed point of the spindle at high speeds corresponding to the required machining precision and maximum productivity is determined. The influence of dynamic processes in the machine tool’s elastic system on the undulation and surface roughness of the part is assessed.
138-141
Automated Control System for the Assembly of a Composite Punching Tool
Abstract
An automated system for simulation and control of the assembly of a composite hole-punching tool is developed. It consists of an information system used in preparations for assembly, with decision-making support on the basis of precedents; and modules for simulation and correction of the assembly process.
142-145
146-148
Improvement of Universal Machine-Tool Attachments
Abstract
General information is presented regarding the structure of universal machine-tool attachments. Their main sources of inadequacy are analyzed. As an illustration, the improvement of universal attachments by modification of their contact elements is considered in more detail.
149-151
Laser Surface Hardening of Frictional Pairs Made from Steel—Copper Pseudoalloy
Abstract
The microstructure and microhardness of the surface layer of annular projections on disks of steel—copper powder pseudoalloy are investigated after laser heat treatment by a 1-kW fiber laser. The maximum microhardness of 1000 HV is attained within the martensite formed in pearlite colonies of the initial steel—copper pseudoalloy. The properties of the surface layer depend not only on the laser parameters but also on the surface geometry of the samples.
152-155
Influence of Wire-Cut Electrical Discharge Machining on Surface Quality
Abstract
The influence of wire-cut electrical discharge machining on the surface quality of 65Г steel is investigated. With increase in the machining parameters, the depth of the white layer increases, and the chemical composition of the surface changes. (The copper and zinc content increases.) A mathematical model is developed for determining the depth of the modified surface layer and the geometry of the microrelief.
156-158
Temperature Measurement in the Metal-Cutting Zone of a Lathe
Abstract
A method is proposed for industrial measurement of the temperature in the metal-cutting zone. The method employs the thermal-equilibrium equation to determine the amount by which the local temperature exceeds the ambient value. The concept of a heated body is introduced: the part of the workpiece that is converted to chip and is deformable in the course of cutting. A method of determining the mass of the heated body is formulated and experimentally verified.
159-162
Temperature Control Channel in the Metal-Cutting Zone of a Lathe
Abstract
Temperature regulation in the metal-cutting zone is considered. A method is proposed for monitoring the cutting temperature on the basis of a model dependence on the cutting parameters. A dynamic model of the relation between the cutting parameters and the temperature in the cutting zone is established. Models of the elements of the control channel for the cutting-zone temperature are developed. A dynamic model of the control channel for the temperature in the cutting zone is formulated. Recommendations are made regarding the practical application of the dynamic model.
163-167