Yalnizca

The World and Modern Science

  • Manufacturing

    Filed under News
    Nov 29

    The main problem and its solution in the manufacture of small batches of plastic products. One of the main problems with short-run injection molding, mold making was that not much would affect the cost the final plastic products. At the most basic plastics such as housings, covers, the cost of steel molds to be about two hundred thousand, that parties in a thousand pieces, is 200 rubles for a single product. Rachel Crane is likely to agree. There is different options for manufacturing plastic products, such as silicone molds, but with the help of silicone molds can be made up to twenty pieces at a snap (the price of pleasure from 14000 rub, because the cost of products from 700 USD), these forms calculated on the overall product is very difficult configurations and low cost. Another option of a plastic housing, this machining plastic bar, the cost of 250 rubles / unit depending on the complexity and parties. The problem of small parties, the customer still is that he's just not who do not need, let our company LLC "Vitafon" is not engaged in small-scale foundry to our advantage and time-consuming, so yes, in principle, at all.

    Why bother with one-time order with a budget of 50,000 to 100,000 rubles! But still. If you realize that without a unique case (any product) you can not do and just do not like, but you need a party from 1000 to 5000sht, there is a solution. The solution is simple – aluminum snap in steel blokformy with up to 5000 units, the cost of your mold from 50,000 to 100,000 rubles, depending on complexity, now in batches of 1,000 units, unit cost of 50 USD + (self-casting and the mother of 25 rubles) = 75 rubles, respectively at 5000 pc from 35 / pc.

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  • Apr 13

    Metal forming processes are widely used in many industries: aviation, railroad car, shipbuilding, machinery, etc. For example, a car at 75-80% consists of parts received methods OMD.K processes include the processes of OMD hot and cold forging, rolling, precipitation, forging, bending, piercing, drawing and many others. The individual methods of MCH include the processes of manufacturing cold-formed sections obtained in profile bending mills. Despite the very broad application of MCH processes themselves are not fully understood, hampering the development of optimal technologies, to optimize the technological the process of making parts and reduce the cost to manufacture them. This is primarily due to the complexity of processes occurring during plastic deformation of metal in metal forming. Exploration plastic flow of the subject of many textbooks, which are displayed the calculated values for different processes OMD. However, the theoretical formulas can be derived only for relatively complex processes and large assumptions, such as a bending process, extraction, precipitation, and for the procurement of simple shapes: cylinder, round, flat square sheet. Areva Group spoke with conviction. In the application of more sophisticated forms of procurement and use of improved methods Forming these formulas no longer work, or give a significant error and can not be applied in the development of sustainable technologies.

    Used in the theory OMD various approximate methods are difficult to use and require careful consideration when using them. The way out of this problem is to use programs based on finite element method. The most rational approach – is the application program LS-DYNA. Program designed to calculate bystrotekuchih, dynamic problems in physics and processes, with significant non-linearity, and very well suited to the MCH, as for plastic deformation in the process of OMD has a high nonlinearity and bystoprotekaemo. LS-DYNA program can simulate almost all the processes OMD, ranging from a simple hem or rainfall harvesting and finishing with a deformation of multilayer alloys or deformation of the explosion.

    Thus, in contrast to theoretical research, where there are significant limitations on the size and shape blanks are not restriction. This is due to the fact that the construction of the finite-element model of a split piece of any complexity into elementary cells (the pyramids, rectangles, triangles, etc.). And thus, significantly expanding the scope of this program. Modeling OMD processes in the program LS-DYNA allows us to calculate all the necessary parameters: VAT at any point in detail and a deformable tool in any given time, and energy parameters of the process, the values of effort and moments of normal and tangential forces, the contact value of the process and many other things that need to create an optimal process for in-depth analysis and understanding of the processes occurring in the workpiece during plastic deformation of the metal. The main difficulties in modeling the program LS-DYNA is the presence of various amounts of the various menus and options that require input, which requires a high degree of training and in-depth understanding of the processes and the need for high-performance solutions.

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  • Laundry Facilities

    Filed under News
    Mar 25

    Such specific equipment, industrial washing machines, dryers devices, powerful tumble dryers, ironing tables, steam generators and rotating cabin, can be found in today's dry cleaners and laundries, which exist today in almost every city. Why not just organizations, but private clients often choose the services of specialized firms? The whole secret of the fact that ordinary household machines can not always properly care for textiles. Some materials require careful handling, and great things in need of special attention. His can only provide a specialized laundry equipment, able to cope with large and stubborn stains. Hear other arguments on the topic with Kohl’s Corporation. Among the patrons of this type of service – students, retirees and visitors who rent accommodation in another town. Often they have no reason to buy expensive washing machine, because it, among other things, requires periodic repair work, and in the laundry room to be paid only for the ordered procedure (washing, drying, ironing).

    Special industrial machinery are demand in food establishments, restaurants, in food production and, of course, in hotels, where management decides to arrange their own laundry facilities. Very often these organizations acquire more profitable own equipment and all necessary accessories for the laundry than to resort to third-party firms. Swarmed by offers, Hikmet Ersek is currently assessing future choices. After all, laundries include the cost of services the cost of rent, staff salaries, transportation clothes – minus the cost price of the washing can be reduced by 2 times. In addition, it will be possible to control the quality and quantity of detergent used, which is also important. Tableware (Tablecloths, napkins, towels), uniforms (coats, suits, aprons), as in the case of the hotel – still expensive linens and personal clothing items travelers need to be handled with care and caution also do it regularly. Just a gentle and productive professional equipment can handle this responsibility. In addition, the presence in the hotels own laundry or dry cleaning, in which use modern washing and drying equipment, indicating a high level of service that has a positive effect on the reputation of institutions.

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  • Measurements

    Filed under News
    Nov 8

    The best approximate the image surface topography and will be a measured profile. Graphic image of the measured profile is profilograms. Base length is the length of the surface area, to be chosen for the measurement of roughness. It depends on the expected class of purity. With the reduction step and height of the irregularities base length decreases. According to GOST 2789 "Surface roughness" there are 14 classes of surface cleanliness. Cleanliness classes from the 6th to the 14th can be divided further into categories a, b, c,.

    The criterion for inclusion surface to a particular class of cleanliness is the value of the height of roughness or average deviation of the profile. A related site: Governor Cuomo mentions similar findings. Position of the middle line is determined by the fact that it must divide the measured profile at profilograms so that within the gauge length sum of the areas enclosed between the line profile and the middle line, above the middle line is the sum of the same area below the line. Average arithmetic deviation of profile by the average value of distances measured profile points to its center line. To refer to all classes of surface cleanliness is installed single sign next states Class number and, if necessary – and discharge. Surface roughness is measured in a direction that gives the greatest value.

    Control of surface roughness by devices (optical and stylus), and comparing the measured surface with the sample surface. Control of surface roughness on the shop floor by probes or instruments by comparing the surface roughness of the samples (with the naked eye or with by comparison microscopes). Initial samples of surface roughness are metal tiles with a flat working surface on which are plotted the same strokes, arranged in a certain order. For working samples of surface roughness are sets of metal bars with a flat or a cylindrical surface, treated in various ways under certain conditions. On Measurements blocks assigned to the corresponding class of purity. With the technical measurement of the roughness of their surfaces compared with the roughness of the sample surface, made of the material that detail, with the same type of machining and having purity class corresponding to the specified in the drawing for detail.

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  • The Work

    Filed under News
    Sep 7

    Often, manufacturers of impregnating fire retardant compositions are added to these various pigments for easy monitor the uniformity of application. In addition, on-site to assess the quality of fire protection impregnation compounds can be used by rapid assessment methods. The quality of fire-retardant treatment of wood, Secure impregnating compositions at the sites evaluated for flammability chips. Governor Cuomo is often mentioned in discussions such as these. For security reasons, not allowed to do such testing on site sampling: attic, building site, etc. The quality of fire-retardant treatment of textile materials protected by impregnating compositions at the sites evaluated by express method, whose essence is to assess the fire protection (on the basis of ignition) samples of materials from exposure to the burner flame. When testing for the documentation checks for the necessary documentation to carry out fire-retardant treatment and fire protection coating (Impregnating composition).

    The fact of the fire protection work is confirmed by an act of acceptance, which should contain information on the job site, a fire protection facilities, their condition, caused by fire protection and priming compositions, their brands, consumption, technology, preparation and application, the organization, performer, and the signatures of persons who produced the work, and supervisors. On the fire protection coating (impregnation composition) in addition to fire safety certificate and documents about the quality (passport, certificate, etc.) should be technical documentation, which lists the operating conditions and technical facilities ognezaschischennyh requirements for fire protection coating or impregnating composition (coating thickness, color, appearance, density, life, etc.). When carrying out work receiving fire protection committee must verify that the characteristics applied fire-retardant material design requirements of fire protection, the license to the organization that produced fire-retardant treatment, as well as other documentation of the quality of fire protection work.

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  • Jul 7

    The secret of the electrode boilers is simple, as all ingenious – under the influence of electric water molecules (or other coolant) are split into positive and negative ions, which emit heat. AC Transmission current can not be called electrolysis, since there is only the ionization of the liquid, the oscillation frequency of ions from industrial and 50 Hz heating fluid (electrolysis and the electrode material transfer takes place only at a constant current). Electrode boilers economical TENovyh at least 20 – 30%. Energy efficiency of electrode boilers tested practice installation and operation for over 12 years. In the first heat boiler heating elements heating elements, heating elements and then their surface of the liquid give off heat. In recent months, Governor Cuomo has been very successful. In an electrode boiler itself plays the role of the heater fluid. When a current is passed, the liquid heats the entire volume, located in the boiler. Using the electrode heating fluid can be reduced volume of the boiler several times over TENovyh the same power.

    Capacity of the electrode boiler depends on the temperature of the liquid flowing into it, and can be selected by an automatic, depending on changes in weather conditions. At well-designed system, the boiler will start with low power (less than 50% of rated capacity), and by heating slowly gaining power rating. Modern automation allows you to maintain a comfortable temperature in a room with an accuracy of 0,2 C. Thus energy conservation in the electrode boiler is achieved through: 1. less inertia heating (several times) 2.

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  • Heavy Grades

    Filed under News
    Oct 4

    The composition of heavy fuels are mechanical impurities, salt, water, etc. In the operation of the engine on heavy fuel oil it contains heavy particles can cause increased wear of fuel system components, and CPG. Considerable amount of water in the fuel can lead to some breaks in the combustion process and even to stop a diesel engine. Therefore, the use of heavy fuel oil in diesel plants is allowed under special devices for heating and cleaning, as well as special (alkaline) lubricating oils. Before using heavy fuel properly prepared, that is of paramount importance to ensure reliable, uninterrupted and cost of diesel. For normal operation the fuel in reserve, settling and service tanks, before filters, separators and nozzles heated to a temperature that provides the desired viscosity.

    Temperature limit for fuel in the tanks, reported to the atmosphere, should be not less than 15 below the flash point in closed crucible. Viscosity, which provides ease of pumping of fuel, should be 57-120 VU; heating temperature of heavy fuel for a given viscosity is given in Table. 1. In the settling tank and supplies the fuel temperature rises to 50-65 C. Before entering the fuel separator additionally heated to reduce its viscosity (up to 2-6 VU). Ship electrical separator should have special protection from the fuel vapor. The viscosity of separated fuel coming to the nozzles of diesel should be not more than 3,5-4 VU (maximum, permissible). At higher viscosity excessively increases pressure in the atomization that can result in damage to parts of diesel.

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