A. L. Vorontsov, D. A. Lebedeva (The Bauman Moscow State Technical University, Moscow)
The study of combined extrusion of tumblers with the co-bottom part.
Part 10. Methodology for calculating technological parameters of the traditional process of free extrusion
A method for calculating the energy-power and deformation parameters of the traditional process of free extrusion of nozzles with a conical bottom part, which includes preliminary obtaining by molding the outer conical section of the bottom part of the product and the subsequent back extrusion of the glass with an internal cavity of the required geometry, is presented. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas make it possible to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and increase in the yield stress.
Keywords: forging; tumblers with the co-bottom part; combined extrusion; stresses; deformations.
A. E. Tsibulko, E. A. Romanenko (PJSC «NKZM», Kramatorsk, Ukraine)
A unified equation of breaking the strength of a wide class of materials in a complex stress state
A unified equation of the limiting state is proposed, from which the criterion of strength and fracture of a wide class of materials under a complex stress state follows, with a flexible approach to taking into account various stress states and the corresponding limiting stresses.
Keywords: complex stress state; specific potential energy of deformation; main and equivalent stresses.
A. V. Platonov, N. P. Yampurin, M. A. Kumaneev, N. A. Yankavtseva, K. A. Shchegletov (Arzamas Polytechnic Institute, a branch of the Nizhny Novgorod State Technical University named after R. E. Alekseev, Arzamas); I. A. Platonov (JSC «Arsamassky Priborostroitelny Zavod Imeni Plandina», Arzamas)
Simulation modeling technique in the research of device design for «Lathe unclamp fixture» to optimize its design parameters and improve its technological capabilities
Part 2. Range of the resulting cutting forces, which retains the strength of the fixture and stability of the workpiece in it
The objective of the research is to identify the optimal range of the resulting cutting forces acting on the workpiece fixed in the «Expanding mandrel» of the lathe. The research is carried out using the method of simulation in the design system «T-FlexCAD». The basis for research is the previously conducted research to optimize the design of the «Expanding mandrel» used for basing and fixing the part «One-way clutch housing» during turning, in terms of mass and strength characteristics.
The range of values of the resulting cutting forces arising during the processing of the outer surfaces of the «Overrunning clutch housing» part, the basing and fastening of which is carried out according to the scheme under consideration, is revealed. The practical application of the proposed research method is advisable in the computational analysis of technological processes of machining parts on lathes using such devices.
Keywords: research of technological processes; simulation modeling technique; unclamp fixture; deployment through the internal diameter; safety factor; turning treatment; device design optimization.
A. N. Petrov (Moscow Politech, Moscow), V. K. Tichomirov, I. A. Korotkov (Production complex «Salut» JSC «ODK», Moscow)
Research into wear of hot extrusion dies for compressor blades
This article deals with wear of hot extrusion dies for compressor blades. Three kind of heat treatment dies were used: «quenching – double tempering», «thermocycling – quenching – double tempering» and «thermocycling – quenching – double tempering – ion nitriding». It is used photo-measuring machine for researching of die wear concerning these experimental dies. There are built die wear diagrams. It is found that wear of the die with «thermocycling –quenching – double tempering» less up to 11 % then others.
Keywords: blades; wear; die life; ion nitriding; thermocycling; heat treatment; quenching, tempering.
T. A. Zhuravleva, A. A. Yudaeva (Bauman Moscow State Technical University (Kaluga Branch), Kaluga)
Factors affecting the accuracy of laser cutting parts
The article deals with the problem of ensuring the required quality of parts during laser cutting. The main factors influencing the cutting result are considered. Technological methods are presented to ensure the required quality of processing.
Keywords: quality; accuracy; processing modes; laser cutting; laser power; laser beam diameter; error; workpiece parameters; focusing.
E. A. Maksimov, E. P. Ustinovsky (South Ural State University, Chelyabinsk)
Development of the design of a roller straightening machine for straightening strips of corrosion-resistant steels
The disadvantages of straightening machines used for straightening strips of corrosion-resistant steels are considered: the complexity of the machine design and the increased installed power of the main drive, the need for which is dictated by the use of several pairs of tension rollers at the input and output tensioning stations, as well as increased tensions when straightening strips. The design of the RPM for straightening strips made of corrosion-resistant steels is presented, the advantage of which is: reducing the complexity of the structure, as well as reducing the installed power of the main drive. Dependencies are obtained for calculating the forces generated when the roller assembly of the machine is loaded by the straightening force, as well as the torque on the intermediate drive rollers. The calculation of the torques on the intermediate drive rollers when straightening a strip of steel 12X18H10T with a thickness of 1,2 mm with an initial curvature of 0,001…002 on a roller of small diameter 50 mm. It is shown that the torque on the intermediate roller is 35 kNm, the total torque on the intermediate roller of the RPM is 70 kNm.
Keywords: straightening; corrosion-resistant steel; structure; roller straightening machine.
D. V. Otmakhov, S. P. Zakharychev, V. G. Alekseenko (Pacific State University, Khabarovsk)
Replacement of tensioning pads materials roller conveyor drive chains
This paper provides a method for determining the stresses that affect the surface of polymer composite tension elements from the rollers of the drive chain of a longitudinal conveyor. In order to improve reliability, it is recommended to use a reinforced epoxy-fluoroplastic material MAS-3HB.
Keywords: method for calculating stresses; forces and contact stresses; wear of rubbing interfaces; choice of materials for friction pairs.
Yu. G. Trukhin, V. I. Chukardin (LLC «Plant Presskuzmash», Voronezh)
About the problems of development of the industry of forging and pressing equipment in Russia
The article discusses the current state of the industry for the production of press-forging equipment in Russia. The main problems affecting the development of the segment are identified and described. The aspects worth paying attention to are given for a possible improvement of the situation in the machine-building industry.
Keywords: industry; industry; machine tool building; exploitation.