Modern Steel Security Doors

Modern requirements for security doors, methods of classification are contained in the following regulatory documents: GOST R 51072-97, GOST 50862-96, GOST 51112-97, GOST 50941-96, SNIP 21-01-97, RD 78.147-93 Ministry of the Interior. By definition, these documents: Door protection – is resistant to cracking device consisting of a door frame with a movable blade attached to it, which is in the closed position is fixed in the door frame locking device or locking mehanizmom.Vzlom doors or wooden euro-windows-actions aimed at violating the integrity of the door or the elements of its structure in order to obtain partial or full access to the protected door pomeschenie.Ustoychivost to crack – the ability to resist cracking the door. The magnitude of resistance to cracking Ec is determined experimentally based on the results of testing according to the formula: Ec = k * t + b where k – koeffitsientispolzuemogo tool characterizes his tehnicheskiparametry (mass, dimensions, electrical power, etc.) and the probability of detection produced by imshuma, vibration, smoke, sparks, etc., t – time in ispolzovaniyainstrumenta tests in minutes, b – a so-called base value tool that characterizes the difficulties egodostavki to the site hacking, need for and water, time to prepare for work, etc. Numerical coefficients k and b for various instruments are given in these regulations. If you use multiple tools to break the resistance door EU is the product of time t test at the highest rate k and used the tool to add to this value the amount of the basic values of all used in the experiment instruments.

Casting

Dimensional stability of the model, lack of a connector shape and consistency of process parameters allow you to be precision castings so as to exceed the precision castings of LPM. In the mold cavity filled with expanded polystyrene, can not get foreign inclusions, which provides fewer blockages. By roughness surface defined in many ways the surface roughness forms, castings castings to meet the LPM. The reason is that in both cases, refractory paint or coating is applied to a model, not the surface form. High quality castings LGM allows for efficient use of the process in the manufacture of castings, which are traditionally manufactured LPM.

The definite advantage to the LGM LPM – the simplicity of its implementation. Practically eliminated or reduced to a minimum coating operations, forming, annealing forms a knockout and cleaning castings. The use of FF instead of LPM reduces consumption of expensive mold materials up to 10 roses Power – 2 – 3 times and labor – 3 – 4 times. For example, the technology of the pump impeller of high alloy by LGM provides such technological parameters of the model of EPS consists of two parts the basic model and the disk cover and their subsequent bonding. This allows you to perform any configuration of the blades of the wheel and avoid the variation in. Other methods of forming, in including LPM and plug shape using a rod, do not provide quality castings. In the manufacture of cast model requires the use of water-soluble cores, because the mold inserts interscapulum can not be performed.

The assembly of rods (even in jig) does not provide ravnostennosti blades in the model. In addition, high-quality coating in interscapulum difficult that leads to defects in castings trudnoispravimym. Consequence of the use of detachable forms a rod – variation in wall thickness of blades and inlets between the rods, whose removal is problematic. Thus, the casting on gasified models to date – the most promising technological process of manufacturing castings weighing from 0.1 to 5 000 kg. instead of well-known classical technologies to produce precision castings. Especially effective is its use in casting slozhnokonstruktsionnyh castings of various alloys.

University Work

Topic has naming: the work is replaced by electric motor muscles. It would like to tell about this new and innovative development of scientists, as an artificial electrical muscle. Those who are familiar with electrician and the basics of electricity, is well aware of the basic ways of converting electrical energy into mechanical motion. This is, first of all, electric motors of various types, principles of operation, type of power, etc. They have, by passing electric current through the inner windings, formed the electromagnetic fields to repel each other, thereby causing the rotation of moving parts. Such movements have rotational in nature, which often requires additional mechanisms for the conversion of translational. At the same time lost some of the energy, increasing energy costs.

Even the motors because of their construction and operating principle of efficiency is not ideal. There is another way to make forward movements by means of the same magnetic field. This is a retraction or repulsion in the electromagnet core. Disadvantages is also not ideal efficiency and the difficulty of a precise control of the action. Now let's see what can be replaced by an electromagnet and electric motor work in our time. This is an analogue human muscle, which runs on the same principle. As you should know from the lessons of biology, upon the momentum of the human nervous system to its muscles, there is a reduction of protein fibers. This eventually leads to simple muscle contractions (reduced length) and carry out some physical work.

This principle is very simple. But due to the fact that scientists are a long time could not create such an artificial material that would repeat the work of human muscles, this idea was in place and had no further development. In 2007, scientists from the University of North Carolina, announced that they have managed to create such an electrically conductive polymer on based on carbon nanotubes.