|
Guryev A.M. et al. Cast Hot Working Dies and Features of Their Heat- and Chemicothermal Treatment.
This article provides a complete description of the production cast stamps for hot volumetric deformation from the waste of tool production. The given technology allows not only to save expensive alloying elements, but also to reach increase of durability press tool. Also during development of this technology were established optimum modes of thermal and chemical-thermal processing of cast stamps, that too promotes increase their useful life.
Appolonov A.A. Effect of Alkali and Rare-Earth Metals on the Ductile Properties of Grade 35GTRL Steel.
The article presents the results of investigations into the effect of inoculating additives: silicocalcium (SC30), ferrosilicon with barium (FS60Ba20), ferrosilicon with magnesium (FS50Mg7) on the mechanical properties of grade 35 GTRL steel. The additives allowed increasing, in comparison with base steel, elongation by 12 to 85% and impact toughness by 37 to 108% at the temperature of 20?C, by 39 to 87% at the temperature of 40 оС, by 67 to 133% at the temperature of 60?C, tensile strength remained unchanged.
Metallographic examinations have shown that the inoculating additives eliminate sharp-cornered sulfide inclusions and refine oval-shaped inclusions, which results in better ductile properties of steel.
Golovichev A.I. Formation of Endogenous Gas Porosity in Steel Castings.
In accordance with literature data and taking into consideration the production practice, a classification of under-skin EGP is proposed. Processing of the literature data allowed advancing a working hypothesis of the formation mechanism of gas porosity, which was checked by experimental work. The practical work's results will allow working out recommendations aimed at porosity reduction.
Markov V.A. et al. A Concept of the Formation Mechanism of Clay-Bonded Unit Sands during Mixing.
The process of preparing clay-bonded unit sands and achievement of the required technological and physicochemical properties depend on the mixing process whose duration and character of progress are to a considerable extent determined by the mechanism of cooperation of the mixer's executive devices with sand components, their condition and properties. Based on the stated formation mechanism the molding properties of clay-bonded unit sands during sand preparation the direction of optimization of sand compositions and properties, as well as modernization of existing and design of new mixers can be determined.
Nefedov K.Y. Easy-to-Shake-out Sodium Silicate Bonded Molding and Core Sands.
Opportunities ofincrease of technological properties, in particular derease of work of knockout, mixes on liquid glass used for steel moulding with the help of use in structure of mixes of the additive of ultra disperse pyrolitic carbon are theoretically proved and experimemtally confirmed.
Mamayev K.V. Core Sand with a Penetration-Preventing Superdispersed Pyrocarbon Additive.
Theoretically motivated and experimentally confirmed the possibility of raising of the strength properties core resin sands mixtures, avoidance of metal penetration and sand burn-on in iron castings due to the usage of additive of ultradispersed pyrolytic carbon in composition of mixtures.
Mustafin G.A. Analysis of Stressed State of a Non-Expendable Casting Mold Made of Dispersed Materials.
The article discusses the stages of thermal state of a non-expendable dispersible casting mold and evaluates the deformations and stresses in the mold during its operation. It has been established that depending on the mold's heating-through temperature elastic and residual deformations influencing the magnitude of stresses and its durability may develop therein. By calculating thermal stresses it has been proved that on the stage of thermal shock a non-expendable mold has a sufficiently high margin of safety.
The longest stage is that of holding a casting in the mold, during which the mold is heated through to high temperatures and considerable retarded deformations form therein. These deformations noticeably reduce the magnitude of compressive stresses, but a significant proportion of residual deformations therein provides the formation of tensile stresses on the mold surface during its cooling after casting shakeout. The magnitude of these stresses may exceed the mold's tensile strength. It has been established that, if the proportion of residual deformations makes up only a tenth of the total deformation, it is sufficient for the formation of stresses that exceed tensile strength.
Moskalev V.G. et al. Use of Products Made of SVS Materials in the Foundry Industry.
Practical use of materials produced by the process of self-spreading high-temperature synthesis (Russian abbreviation SVS) in the foundry industry, in particular, in expanded pattern casting, tooling ventilation and other production operations, allows, in the end, preventing the emission of harmful substances into the atmosphere, and, consequently, improving the hygiene and sanitary conditions. In addition to that, it reduces the molding materials consumption, specifically, dry filler, by both reducing the thickness of sand layer around the casting and repeatedly reusing the sand without reclamation.
Peshkov M.V. Analysis of Drum Mixer's Working Process.
Mixers differ, in the first place, by the structure of executive devices (ED). The main task in the investigation of drum mixers is to study the impact of EDs on the sand components during sand preparation, and to establish optimum mixer operation conditions. It is in this direction that the investigations were carried out, in particular, they have designed EDs for a mixer, selected optimum process parameters using mathematical modeling. The results are beneficial.
Krasichkov V.A. Investigation into the Process of Selective Mixing of Clay-Bonded Unit Sands in a Rollerless Centrifugal Mixer.
Processes of disaggregation of a sandy-argillaceous mix at selective mixing in centrifugal roller-less mixer are researched. The comparative estimation of processes of sand preparation in centrifugal roller-less mixer and laboratory muller mixer is made.
Islentyev Yu. Ye. et al. Precision Casting Shop at OAO Altaidiesel.
In clause the description of modernization of shop of exact moulding of Open Society "Altaidisel", dynamics of release of suitable moulding and percent of marriage since 1991 is submitted. The basic consumers, let out alloys and characteristic casting are submitted.
Ferapontov A.G. et al. Mastering the Manufacture of Diesel Engine Cylinder Block Castings.
In mastering complex parts, in particular, cylinder block, at OAO KhK Barnaultransmash they were confronted with the necessity to dramatically raise the level of technology and apply non-standard solutions, in order to achieve the modern level of production of critical parts for the machine-building industry. Specifically, they started to make cores with hardening in the core box with thoroughly elaborating the finishing operations - assembly, washing, gluing; in mold making special attention was paid to elaboration of gating systems. The processes of alloy making and mold pouring have been thoroughly worked through. All that allowed mastering the cylinder block manufacture.
Markov V.A. et al. Using the LOM Technology in the Preparation of Casting Production.
This article reviews methods of making pattern tooling depending on the type and class of casting complexity, different casting classifications based on different parameters (quantity/surface complexity, number of cores being used, axis dimensions ratio) are given. The necessity of using various methods of automating the pattern tooling manufacture is pointed out.
Advantages of using the LOM technology in comparison with other rapid prototyping technologies have been substantiated. The main virtues and shortcomings of that technology are indicated. The main shortcoming of some applications of the LOM technology is the use of manual (non-automatic) splitting of a 3D geometrical model into lofts (cross-sections by which a LOM pattern is assembled).
A method of automating the preparation of cross-sections of a 3D geometrical model using software to eliminate the shortcomings of the non-automatic splitting has been proposed. Such software has been developed, the article provides a description, the main functions and work results. An authorship certificate for the software has been obtained.
| 
