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Том 36, № 6 (2016)
- Год: 2016
- Статей: 20
- URL: https://journals.rcsi.science/1068-798X/issue/view/13973
Article
Transformation parametric structures of nano- and micromotors with longitudinal piezo effect
Аннотация
A structural–parametric model of a piezo motor is formulated by solving the wave equation. The influence of geometric and physical parameters and external loads on its static and dynamic characteristics in the control system is studied. Transfer functions are derived for piezo motors used in nanodrives. The parametric structure of the piezo motor is determined and transformed.
423-434
Self-adjusting hydraulic damper for a pneumatic robot
Аннотация
A hydraulic damper with self-adjustment of the damping force is developed for the executive mechanisms of mechatronic systems with cyclic control. Equations of motion of an executive mechanism with the damper are proposed, taking account of the external forces. Analytical formulas are derived for the basic structural parameters of the damper.
435-439
Tensometric monitoring of the nonplanarity of circular saws in asymmetric flexure
Аннотация
The potential of acoustic tensometry in monitoring the nonplanarity of circular wood saws is considered. A suitable monitoring parameter is identified, and zones with the maximum residual stress are found. These results are recommended for use in monitoring nonplanarity.
440-442
Deformation of metals with slight elastoplastic deformation
Аннотация
An analytical equation describing the quasi-static deformation curve of metals with slight elastoplastic deformation is proposed. This equation yields high precision in plasticity problems. The components of the equation are found from the experimental deformation curve.
443-445
Express monitoring of the strength of threaded components
Аннотация
Express monitoring of the strength of bolts is considered. In the proposed method, a spherical indenter is introduced in the material, the diameter of the residual impression is measured, and the plastic hardness is determined from the contact hardening module of the material.
446-448
449-451
Influence of tool geometry on the stress–strain state of pipe in expansion by a shaped draw bar
Аннотация
The expansion of shaped pipe in oilfield borehole repair by means of various shaped draw bars is modeled by the finite-element method. The optimal draw-bar configuration is determined from the pressure on the tool and the effective strain. Recommendations are made regarding the shape of the draw bar.
452-453
Stress state of wear-resistant tool coatings
Аннотация
The stress state of wear-resistant coatings is investigated. It is determined by the total stress and depends on the coating composition and the basic tool material. It will also depend on the structure of multilayer coatings. The influence of the stress state on the tool’s wear rate is demonstrated.
454-460
Wear of diamond tools in the dressing of discrete grinding wheels
Аннотация
The wear of a diamond tool in the dressing of continuous and discrete grinding wheels is studied. Formulas are derived for the wear of the diamond grains and the dressing tool when applied to a wheel with a discrete cutting surface.
461-465
466-468
Abrasive-jet machining of large hollow components
Аннотация
Analytical formulas are derived for the internal surface characteristics of a large cylindrical workpiece after treatment by an abrasive–air jet as a function of the machining conditions. A formula for the productivity is also presented.
469-471
472-475
Automated design of model sets in the manufacture of large structural castings for the basic components of mechatronic machine tools
Аннотация
An automated information system is developed for the design of model sets required in the manufacture of large structural castings that may be used in the basic components of mechatronic machine tools. The analysis is based on 3D geometric modeling by means of the API function in the CAD system. The results permit the automated design and subsequent manufacture of model sets for numerically controlled machine tools.
476-483
A new machine tool with parallel kinematic structure
Аннотация
A new machine tool with parallel kinematic structure and a special Hooke’s joint of increased rigidity is described. The static rigidity of the machine tool is simulated. Nonuniformity of the rigidity distribution at characteristic points of the working space is analyzed with different directions of the cutting force.
484-487
Trends in research on metal-cutting machines
Аннотация
This review covers the current state and prospects for the design of metal-cutting machines, including numerically controlled machines. The characteristics of common mechatronic modules are considered. The structure of metal-cutting machines is outlined, and means of complying with operational requirements are presented.
488-495
Predicting the cutting properties of hard alloys for the manufacture of components used in gas-turbine engines
Аннотация
Hard-alloy tools for the machining of components used in gas-turbine engines are considered. Thermodynamic analysis of the relation between tool wear and mechanical and thermal phenomena provides the basis for an express method of selecting the best tool material.
496-501
Shaping of a helical surface in rotary machining
Аннотация
Besides traditional cutting tools, rotary tools are now being used. In view of their benefits, further research is advisable, with a view to their widespread use — in particular, in the machining of complex surfaces. The possibility of producing a helical profile by means of rotary tools in a traditional cutting configuration is mathematically established, with slip of the chip over the face (beginning at the larger diameter of a tapered tool).
502-505
Analysis of current cutting standards
Аннотация
Current cutting standards associated with tool failure and tool efficiency are analyzed. The Taylor power law relating the operating conditions of the tool to the outcome is appraised. The Taylor law is only applicable within a limited range and cannot be used in determining the optimal cutting conditions.
506-507
508-510
Applications of natural diamonds in environmental monitoring systems
Аннотация
All production processes are associated with human action on the environment. Water pollution is an inevitable consequence of economic activity and a major environmental problem. Effective monitoring of wastewater pollution is necessary to prevent the degradation of our water resources. The use of instruments based on natural diamonds to monitor water pollution is considered in the present work. The expanded utilization of natural diamonds is itself an aspect of effective resource management.
511-513