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Том 38, № 1 (2018)
- Год: 2018
- Статей: 15
- URL: https://journals.rcsi.science/1068-798X/issue/view/14024
Article
1-6
Optimizing the Support of a Stellar Sensor
Аннотация
The mass of a support for a stellar sensor in a spacecraft is minimized in the light of requirements on the first eigenfrequency and the reactive force in the connectors. Topological and parametric optimization is employed. The finite-element method is adopted, within the capabilities of the Altair Optistruct system
7-12
13-14
Improving Operational Reliability by Means of Artificial Intelligence
Аннотация
A new approach to ensuring operational reliability is proposed. In this approach, three conditions for ensuring operational reliability must be satisfied. A mathematical apparatus for calculating the reliability of such structures is developed.
15-18
Optimizing the Support Polygon of a Wheeled Excavator in Terms of Stability
Аннотация
The active safety system of a wheeled-walking excavator with automated control of the suspension is considered, in terms of optimization of the base of support (support polygon). Simulation permits assessment of the excavator’s static and dynamic stability.
19-21
22-28
Influence of Heat Treatment on the Properties of Nickel–Chromium–Silicon Bronze Wire
Аннотация
The selection of optimal heat-treat conditions for nickel–chromium–silicon bronze wire used in the production of helical compression springs is considered. In experiments, the microstructure of samples after aging at 440–480°C is investigated. Tensile tests are conducted.
29-32
Drilling of Hard Rock by Means of Polycrystalline Diamond Inserts
Аннотация
A specialized measurement unit is developed to determine the basic parameters in the drilling of hard rock by bits with polycrystalline diamond inserts. The unit permits the collection of information and its wireless transfer to a computer.
33-35
Manufacture of a Wear-Resistant Pipeline Knuckle Bend: Theoretical Principles
Аннотация
Analysis of the patent for a wear-resistant knuckle bend in a gas–oil pipeline shows that one of the claims presented there is incorrect. Theoretically, it is established that the introduction of a protective vane within the knuckle bend improves the gas dynamics close to the problematic wear zone at its wall. Manufacture of the vane from steel strip by complex deformation is shown to be economically viable.
36-39
Strengthening Chamfer at the Rear Surface of Ceramic Thread Cutters
Аннотация
The brittle strength of ceramic cutting inserts may be increased by means of a strengthening chamfer at the rear surface. A method of determining the destructive supply is proposed. The dependence of the destructive supply on the depth of preliminary cutter insertion is established
40-43
Management of Digital Equipment in Preproduction by Means of Uniform Numeric Control Language
Аннотация
The requirements on preproduction and the control software for various digital machining systems (numerically controlled machine tools, robot manipulators, additive manufacturing equipment) in flexible production are considered. By analysis of existing programming languages for digital equipment, UNCL (Uniform Numeric Control Language) has been developed for standard representation of control commands. The use of UNCL in verifying program operation on a machining simulator is considered. Software for the translation of control programs (specified in CLDATA formats and in ISO code) to the invariant format of the universal language is described. The postprocessing of control software from the universal language into programs in commonly used digital control systems is also considered.
44-48
Laser Surface Alloying of Aluminum Alloys
Аннотация
Surface alloying of aluminum alloys by means of laser heating is considered. The surface hardness of aluminum increases to 5000–7000 MPa on alloying with pure metals and to 6500–8000 MPa on alloying with chemical compounds. The wear resistance of the surface layer is increased by a factor of 4–5 on alloying.
49-52
Improving the Properties of Low-Alloy and Carbon Steel Tools by Cyclic Nitriding
Аннотация
Cyclic nitriding characterized by uniform alternation of cycles with high and low nitrogen potential is considered. In the active stage of the process, the surface layer of the steel is saturated with nitrogen, forming a nitride zone. In the passive stage, the nitrides are resorbed and the internal nitriding zone expands. The phase composition of the nitrided layer in У8 and ХВГ tool steels may be regulated so as to increase the wear resistance of the steel and form a smooth hardness gradient over the surface layer. The length of the active and passive stages such that the wear resistance of the steel is 2.5 times greater than in traditional nitriding by ammonia is determined.
53-56
57-60
61-64