Modernization  and  repair  of  self-propelled  machines.  (1)
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Protect the surface of the concrete floor
To protect the concrete floor, which is operated in the normal mode, or is subject to wear in areas with high traffic, there are several ways to protect the surface.
   Comparable ways: their cost, appearance and ability to perform the task to protect.
   In this article, we consider three ways to finish and protect the floor. Each of them has its advantages and disadvantages.
  
   Thin fil...

Finishing compositions based on water glass. Part 3
When used as part of exhaustion moderator comes coagulation and solidification of liquid glass. However, due to the presence in the composition of Portland cement with a finishing time is an increase strength of the coating due to hydration of cement minerals. Thus from colloids formed during the coagulation liquid glass are actively assigned to the water for hydration of cement, a porous media formed tumors filled Portland cement, which leads to...

Finishing compositions based on water glass. Part 2
Studies in Berlin Institute Federal institute for Materials Research and Testing, show that the average density of 1730 kg/m3 brick large proportion of pores having a size in excess of 1 micron is more than 90% [3] and they are responsible for the increased migration of fluids through brickwork.
   Most fully meet these requirements structure obtained by coagulation and water-soluble potassium silicate forming silica with a high sp...

Modernization and repair of self-propelled machines. (3)
Hardening electrolysis BORATING hinge pins and bushings mates working equipment hydraulic excavators EO-4121 (EA-4321) gives an increase in wear resistance 4-6 times compared to the bulk quenching details.
   Taking into account the high wear resistance of brazed blades, hardened sintered alloys (see Table 1), are recommended for carbide knives dumps graders DZ-122 and RS-98, combined machine E-405 based on KAMAZ, for front dumps a t...

Specialized exhibition Architecture. Construction (END)
Mari-lime brick and gas silicate blocks
   JSC "MZSK" produces silicate brick and a half, color (white, yellow, black, red, blue, green, brown).
   For the production of silica brick used quartz sand from quarries near the plant. Limestone enters the factory with Dobryatinskogo deposit Vladimir region. Silicate brick (Table 1) is used for masonry exterior and interior walls of buildings and structures, as well as ...

Geophysical processes primers and security. Part 5
In the center of Moscow can distinguish vertical structure comprising a crashing into the Earth`s crust magma elongated cylinder (Fig. 2) [5]. In the center section marked lack of extensive vertical zone converted waves ("blind spot"), going from the depths of 70-80 km to 7.5 km. Such "blind spots" are characteristic of the earth`s crust with the introduction of monolithic dense mantle rocks such as gabbro, diabase, etc. In such a zone Tashkent e...

Finishing compositions based on water glass. Part 1
The quality of the decoration of buildings for new construction and reconstruction depend not only on their aesthetic, but also the operational parameters, as good-quality finish - a guarantee of durable service basic designs, long maintenance-free operation, the costs for maintenance and care. Traditional binders used for the production of finishing compositions, liquid glass is widely used, but it has some drawback: coatings based on it gaining...

On possible amendments to the equation Griffiths
Griffith presented a picture of destruction allowed to formulate the problem of determining conditions of the beginning of crack propagation and find its general solution.
   As seen from the above schemes, in the process of crack propagation material directly adjacent to it "coasts" unloaded relaxes. This means that the stress and strain it decreases, and the elastic energy stored earlier in this area of ​​the body is re...

Construction skyscrapers - the requirements of modernity. Part 4
The program is a high-rise building in Moscow
   The project is now a high-rise building in Moscow is implemented in two main areas: the construction of business center "Moscow City" and implementation of the program of the Government of Moscow "New Ring of Russia."
   1. Moscow international business center "Moscow - City"
   The project includes the construction of buildings on the territory of abou...

Degree project - beginning of the road. (3)
Given the great diversity of subject matter and content of diplomas in various specialties, the jury is faced with great difficulties in determining the winners - "Who better violinist or a dancer?". Nevertheless, often based on emotional perception and can estimate the relevance and novelty, and the author`s contribution to the thesis project or job. Absolute winners in recent years have been graduates of Rostov CSO GASU St. Petersburg, Nizhny N...

 

 
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 Modernization  and  repair  of  self-propelled  machines.  (1)

Special conditions of use self-propelled machines are characterized by high specific loads and speeds, low temperatures coupled with aggressive corrosion-mechanical influence of the environment and other adverse geological and climatic conditions. For one reason or another self-propelled machines work is accompanied by an intense process of wear, corrosion, fatigue, brittleness, reducing their reliability, durability and efficacy. Warning of the critical state of self-propelled machines and restore their original functional parameters is possible by the use of restoration technologies, providing suitable upgrades and repairs.
   Up to 90% of failures are caused by wear self-propelled machinery working bodies and mobile connections, which poses the problem of wear protection in the most urgent and restoration technology - in the category of widely sought after. Taking into account national and international experience in the department of "Metal Technology" MGSU developed restoration and strengthening technologies surfacing, spraying, soldering, heat treatment, etc.
   For reinforcement knives (blades) milling machines used different surfacing materials and methods, as well as induction brazing cutting elements of sintered hard alloys. Of deposited materials are most effective boron coated electrodes brands CBC-45 and X-5, as well as composite surfacing relit manganese-copper-nickel. Restoration of worn blades directly in field conditions is possible electrodes operation vanno-16-arc method. The developed technology allows you to recover knives width of 100 ... 120 mm by up to 60 mm.
   Given the long production technology of coated electrodes and their higher cost developed automatic electric arc surfacing layer on submerged powder (Fig. 1). The relative simplicity and high performance technology for surfacing charge of different chemical composition, shallow depth of penetration of the base metal (0.8 ... 1.0 mm) - the advantages of this method of surfacing. It is recommended for hardening of cutting edges of knives bulldozers, dozing and ripping machines, graders and other long parts.
  
   To be continued.
  

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