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Vol 38, No 10 (2018)
- Year: 2018
- Articles: 17
- URL: https://journal-vniispk.ru/1068-798X/issue/view/14033
Article
Determining Pipeline Eigenfrequencies on the Basis of the Shock Response of Prefabricated Structures
Abstract
Methods of calculating the dynamic characteristics of prefabricated structures are analyzed. A new method of calculating the vibrational stability of such structures is proposed. In sample calculations, the existing and proposed methods are compared for a prefabricated pipeline structure in a hydraulic system.
743-747
Two-Channel Capacitive Ignition System with a Transistor Converter for Ground-Based Gas-Turbine Engines
Abstract
A prototype of a two-channel capacitive ignition system for ground-based gas-turbine engines is developed. This system is based on a single-stage flyback transistor converter with a field-effect transistor controlled by an integrated timer. The timer operates in square-wave generator mode, with additional low-voltage voltage stabilization.
748-751
752-754
755-760
Test Methods for Power Tools
Abstract
Tests of power tools and measurements of the impact energy on the basis of Procedure 05 of the European Power Tools Association (EPTA) and the method in State Standard GOST 55162-2012 are compared by means of the UIPU-4M system (developed by OOO UDARMASh). It is found that the test and measurement methods may be improved, with increase in precision and reproducibility.
761-768
769-772
773-775
Optimization of the High-Speed Turning of High-Temperature Nickel Alloy
Abstract
Existing recommendations regarding the high-speed milling of metals are considered. To optimize the cutting temperature, an inverse method of determining the best cutting speed in the turning of KhN77TYu high-temperature nickel alloy is proposed. MathCAD software is used to calculate the machining conditions.
776-779
780-784
Energy Processes in Complex Systems
Abstract
The energy processes that arise in complex systems as a result of the interaction of disparate components are studied theoretically and experimentally. The performance of a complex engineering system is found to depend not only on the quality of its components but also on the ability of the components to receive stored energy and make rational use of it within the system. The basic approaches to ensuring high-quality design of systems containing electrical, mechanical, dynamic, and control components are identified.
785-789
790-793
Ultrafast Sharpening of a Hard-Alloy Tool
Abstract
The sharpening of hard-alloy cutting tools affects their life and reliability and the quality of the machined surface. In the case of imported tools for high-precision machining, the rounding radius of the cutting edge after sharpening is 10–15 µm. That permits machining with chip thickness no less than 20–30 µm. This limit is often critical, since the machining precision of some important components is 3–5 µm. In addition, such sharpening shortens the potential tool life. If sharpening is improved so that the rounding radius of the cutting edge is 3–5 µm, the machining precision is enhanced and tool life is extended. That improves machining [2].
794-797
798-801
Structure of the Force Field near the Cutter Tip with a Highly Damping Handle
Abstract
802-808
809-813
Factors Affecting the Surface Roughness in Burnishing
Abstract
The influence of the following factors on the surface roughness of steel workpieces after burnishing is studied experimentally: the method of attaching the polyhedral insert, the interference, the flow velocity, and the burnishing speed. The surface roughness is assessed in terms of the mean profile deviation Ra.
814-817
Influence of Spindle Wobble in Turning on the Workpiece’s Surface Topology
Abstract
The shaping trajectory of the cutting tool relative to the workpiece consists of the trajectories of the machine tool’s working components, trajectories unrelated to control of perturbations (including spindle wobble), and deformational-displacement trajectories of the tool and workpiece relative to the supporting system. In the present work, the perturbation considered is wobble, which depends on the precision and state of the machine tool. Spindle wobble in a lathe leads to the formation of various attractive sets associated with deformational displacement of the tool. The result is to change the shaping trajectory. That affects the geometric topology of the machined surface, which depends not only on the shaping motion but also on independent processes that accompany cutting, such as plastic deformation, thermodynamic phenomena, and dissipative structures formed in the cutting zone. The present work examines how the attractive sets associated with the deformational displacement produced by spindle wobble are related to the surface topology. The contribution of the wobble to the surface topology is assessed.
818-823