Vibration Stress Relief equipment on the benefits of casting, welding and other components

Casting, welding, forging, machining, etc. during the manufacturing process, the workpiece internally generated residual stress. The presence of residual stress will inevitably lead to the deformation of the workpiece, cracking, and seriously affect the stability of the size of the workpiece, reduce the fatigue life of the workpiece. The traditional aging treatment is a natural aging and thermal aging. Natural aging long production cycle, the accumulation of capital, and the space occupied by: thermal aging and annealing temperature, and cooling time speed, aging furnace temperature difference and other factors, and huge investment. With the development of science and technology, increasing aging VSR due to aging effects of the dimensional stability of the workpiece, economical and practical, less investment, energy conservation obvious advantages, gradually replaced the traditional natural aging and thermal aging more and more widely used in practice.

Vibration Stress Relief from percussion aging. The workpiece through special equipment to generate the resonance in the natural frequency, so that the the cyclical dynamic stress and the residual stress is superimposed, so that the workpiece partially plastically deformed and release stress. Thereby reducing and averaging Chemical member internal residual stress, and the accuracy of the workpiece size to achieve stability. The vibration processing technology, also known as do vibration to eliminate stress, in the country, also known as VSR. It will have a the eccentric weights motor system (called the exciter) placed in the member, and the member is supported with rubber mats and elastic objects, as shown in Figure 2.1. Starter motor and adjust its speed by the controller, so that the member is in a resonance state. After about 20 to 30 minutes of vibration treatment can achieve the purpose of adjusting the residual stress. Vibration test systems and strain (or stress) test system, Vibration Stress Relief process used to measure amplitude-frequency characteristic curve monitoring the amplitude of the dynamic stress changes. The vibration treatment member equipment layout can be seen, to adjust the residual stress with a vibration technology is very simple and feasible.

The residual stress after the vibration treatment member can be eliminated from 40% to 50% high tensile stress area, left glazed winter eliminate larger than the low stress zone. Therefore can improve the strength and fatigue life, reduce stress corrosion, prevent or reduce the incidence of microscopic cracks caused due to the heat treatment, welding process, which advances in the ability of member resistance to deformation, stable members of precision, progressive mechanical quality.
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China steel structure steel structure construction technology

New construction technology center &nbsp twenty-sixth World University Games held in Shenzhen in August next year.As the "bird's nest", undertake the Universiade opening and closing ceremonies and the main event of Shenzhen Universiade stadium also has attracted a lot of attention.The builders in the engineering project, process difficult, complex construction process, refine on, worked tirelessly, compose the venue construction gorgeous.The first rotary slip new technique Universiade center "a museum" is the 2011 World University Games Stadium, a total investment of 4100000000 yuan, in 2007 August start working.Among them, the main stadium is currently the largest stadium under construction, will be held at the Universiade opening and the final China steel structure track.Universiade stadium complex structure, the internal membrane of the steel roof system,


Adopted in the steel roof of "saddle single-layer folded-plane spatial grid structure steel structure", the highest point 51.3 m, Max suspended 68.4 meters, the entire structure is novel and unique, and the gymnasium, swimming pool together constitute three of  "crystal stone".Engineering in the construction is faced with a series of world-class technical problems, both in quality, construction and technical aspects, difficult as Beijing Olympic Stadium "bird's nest".The special is the first in the domestic large scale use of cast steel node and super thick casting steel pipe, this novel form of steel structure, so that the Universiade Center steel quantity only 180000 tons, equivalent to the "bird's nest" quantity of steel 40%.Due to the structure of novel, complex shape, design for cast steel component quality requirements are very high, the current domestic only a few items used, no national standards and norms, the volume is big, the casting is difficult, it is rare.China steel structure In order to ensure the Universiade Center steel structure construction, project uses new technology.Reportedly, the international large-scale buildings using the rotation slip new technology for the domestic first, on the 95 day was completed inside the stadium in 5800 tons of steel structure construction, achieved domestic Stadium Steel Structure Construction of new record.Universiade Sport Center Stadium steel structure project has won the 2009 prize of China steel structure and the first batch of Guangdong Province gold "steel structure, steel Award", in the construction has not yet completed cases, it has become a benchmark for National Stadium construction.A born beauty of fair-faced concrete Dayun center uses a lot of abroad in the construction industry,





Especially the developed countries such as Japan, Germany, the universal application of the fair-faced concrete technology.This technology has the advantages of durability, short construction period, less pollution, lower maintenance cost advantages, but for the template system, supporting structure, concrete pouring and curing construction technique, strict requirements.Universiade stadium stands for clear water concrete prefabricated plate, surface density, beautiful appearance, few attended Beijing Olympic Games venue construction and supervision of the total package units, generally reflect than "China steel structure's nest" effect is ideal.It is a primary color, reduce pollution, repair costs are relatively low.Universiade center's main designers, German GMP international architectural design limited company president von Gkan visited the Universiade center, Dayun Center for fair-faced concrete effect is very satisfactory, said it was the best he has seen the effect of a clear water concrete, and said to the Chinese enterprise technology to germany.In addition, in order to achieve unique crystal stone effect, Dayun center was designed in 20 different light distribution, and use of the world's leading 6 core patented technology independent control system, can be synchronized control 23880 sets of intelligent lighting, a total of 88350 independent control unit, and can realize 365 days a year to automatic operation and monitoring of.All fixtures are mounted on steel structure part of the main beam and secondary beam, realize the lamps and trough concealed, completely eliminates the significant optical, constitutes a beautiful silhouette effect.
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Superfinishingin the production and Application

Vibration Stress Relief in the market breakthrough in recent decades, vibration aging equipment processing research and application, in our country has achieved rapid development.During this period, with many domestic units together, in the mechanism of vibration aging equipment and applications, has achieved breakthrough results, made our country about vibration aging treatment technology of the national industry standards, to guide the application of the technology and equipment of the production progress, promoted the technology in machinery industry wide application.Vibration aging originated very early, in the last century fifty's, along with the development of modern science and technology, the vibration theory, the test technology and the excitation vibration aging equipment all gets rapid development.So that, in a workpiece resonance frequency of vibration, the vibration can shorten the processing time, eliminate stress and stability precision is better, also the least energy consumption.At the same time, there is a corresponding vibration equipment.This new type of vibration aging process and equipment appearance, immediately by the close attention of all countries, rapidly applied in production practice.As a result of this technology is mature with each passing day, vibration and control improving equipment, vibration aging has been for more than 10 industries are widely used in developed countries.Vibration aging usually only half an hour, electricity and a few yuan the cost limitation, can achieve the aging effect, but also can handle whenever and wherever possible, neither reduce the hardness, and no dust pollution and oxidation skin, it is the heat treatment and natural aging incomparable, known as desired without the costs of aging technology.Vibration aging equipment and processing technology and wide application of the technology have been found and develop.


Vibration Stress Relief in the production of the application of vibration aging equipment with his application approved by the majority of users, has gradually developed, the utilization of equipment, in production has played a great role in promoting, he can be used to stabilize the component deformation, improves the capacity of deformation resistance, improve component size precision at the same time, can effectively reduce and average residual stress, increase the working strength and fatigue life.Vibration aging equipment can also prevent the member in use in the crack.Vibration stress relief technology in relative machinery industry application is very extensive, no matter whether the object has multiple, can be used for handling vibration aging equipment.As long as the basis of structure type selection component vibration parameters and device, can achieve the purpose of eliminating the residual stress.But, even so, obviously, the equipment is still has its limitations.This is due to vibration ageing device performance limitations of the results.At present domestic and foreign production of vibration ageing device, its frequency range below 200Hz, long, wide, if component high ratio close to 1, and the stiffness of the structure is large, it may cause the component natural frequencies over Vibration Stress Relief use frequency range and no resonance.In this case, it must be used in low frequency and large exciting force technology or modular clamping method to reduce the frequency of.To make a long story short, vibration aging equipment and other large parts processing also has been widely applied, because he is a simple, efficient, energy saving, environmental protection and efficient advanced technology, without the size, weight, structure and space limitations, it is worth of application and promotion.

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Construction Engineering durability in several categories

Ministry of Construction Engineering durability classification, but according to the design life span and safety classification reliability design of uniform standards, in accordance with the building structure, "the General Provisions:'s design life of the structure shall be in accordance with Table 1.0.5 using. 15 temporary structures in Table 1.0.5 design life span of classification categories designed useful life (years) sample 225 easy replacement of structural members 350 ordinary houses and structures 4100 monuments and especially important architectural structure building structure design, should be based on the structural damage the seriousness of the possible consequences (endangering human life, resulting in economic losses, social impact, etc.), the use of different levels of security. The division of the structural safety level should be consistent with the requirements of Table 1.0.8 Table 1.0.8 the security level of the building structure level of security is not serious destruction of a very severe consequences for the type of building housing two serious general housing three secondary Note special buildings housing its security level should be determined according to the specific circumstances of a separate; 2 foundation design level of security and the security level of the building structure, design seismic requirements shall also comply with the provisions of the existing national norms.

Perfect interpretation of the B & R control technology in metal processing machinery

Introduction symbol of reliability and durability - Kaltenbach. Power saws and band saws Kaltenbach company's main products, widely used in metal processing machinery, and give high marks for the metal industry expert in the field of well-known, the type of metal processing machinery normally used B & R ( B & R), automatic control technology, because the B & R innovative concept for all of this possible. "The key factor when we choose B & R (B & R) B & R has many advantages such as rich in unique applications, to help customers design the best solution strength" Kaltenbach indicated that the company, electrical design manager Gerhard Strobel said the case . Kaltenbach pursuit of high-quality and high reliability of the product, rather than blindly follow the technology trend to research and development of our products; thus supplier expectations with many years of experience in product development is to provide customers with innovative products. "This, of course, also include an excellent value for money, it is very important for the continuous production machinery manufacturers. "Gerhard Strobel adds. In 1996, German suppliers interrupt supply control system, Kaltenbach decided to replace the supplier. The twists and turns of the past after we choose the control system are always not satisfactory, the vendor can not provide supporting standard accessories such as analog I / O and axis positioning card project, cause we can not establish standards for clients such as can not connect rotary encoder such situations will occur. "Gerhard Strobel recalls. In addition, the suppliers only provide a the expensive single site license. Obviously, we must as soon as possible to solve the problem of the control system. 120,000 Kaltenbach manufacturing machines being used around the world. Faced with such a large number of the replacement system becomes extremely arduous. Due to the the rich metalworking manufacturers product categories and different, this step is to Maide very difficult. The Kaltenbach total of 450 employees, professional R & D and manufacturing of steel and aluminum power saw, band saw, and light steel keel processing system, sheet metal processing equipment, as well as punch and cutting system. Requirements of the high standard of the machine based on the material being processed Kaltenbach indicated that specifications and diverse products is able to provide customers with the best solution: separate production line can have a variety of designs, such as from a semi-automatic saw machines to high-performance full The automation Saw. The now control system must be able to meet the diverse needs of the various types of products. Gerhard Strobel explains, "We use six different types of CPU-other components, such as different I / O configuration, and so the model is also very rich. A fresh start - a trusted B & R control technology "our current major integrated Motorola / Freescale processor-based PLC. Currently, we are for the controller to replace the Intel processor." B & R a new generation of PCC X20 CPU based on Intel technology. "The reason we have a keen interest in the X20 system is because of its excellent cost-effective and high-performance rich combination --- small CPU unexpected performance --- modular structure of the system are able to provide more for our machinery to provide strong support. Kaltenbach indicated that companies like Power Panel as the semi-automated system HMI controllers and industrial PCs combine the structure of complex processing machinery, automation systems,

Highway communications, monitoring, collect fees system lightning protection solutions

One, overview of lightning disaster is a "United Nations International Disaster ten years" published in ten of the most serious natural disasters.The latest statistics show that, the lightning caused by natural disasters loss has risen to third.The United States ranked among the top 1000 enterprises, the average every year due to a lightning strike is a loss of $200000 a year, China, caused by lightning casualties nearly 10 thousand people, lightning caused property damage estimated at 50~100 billion yuan.Guangdong Guangdong Province at present average annual thunderstorm days nearly 90 days, frequent rate ranked second in the nation, but due to a higher degree of modernization, the losses caused by the lightning stroke lists the whole nation the first.A microelectronic communication network equipment located in various buildings, due to lightning induction caused by indoor information system microelectronic equipment damage significantly increased the likelihood of each year, all kinds of lightning events proved repeatedly: conventional building design and installation of lightning protection device and can not effectively prevent lightning induction, electromagnetic pulse, static electricity and lightning wave intrusion on the communication system and computer network information system the harm caused by.Highway two, the comprehensive lightning protection design scheme based on comprehensive lightning protection in highway design mainly adopts the following standards, for a time reference.In 1, GB50057-94 "design code for lightning protection of buildings" 2, GB50343-2004 "of building electronic information system." "3, IEC61024" IEC61312 "4 building lightning protection, protection against lightning electromagnetic impulse" 5, GB50174-93 "code for design of electronic computer room" three, high speed road building lightning protection measures in 1, monitoring center building in general set in the control and management of freeway access terminal or central position of the region.Due to the surrounding terrain relatively open, floor is in commonly six above, height more than 20m and the roof is also provided with various types of communications antennas, some still frame is provided with a tower, these are the important objectives of lightning.The building has a large number of real-time operation of the electronic, microelectronic devices, and the entire airport command center height, according to GB50057-94 "design code for protection of structures" (2000 EDITION) regulations, can be divided into two types of lightning protection building.According to the rolling ball method (by rolling ball radius 45m) design of lightning arrester.Design method please refer to "design code for protection of structures" appendix four, decided to lightning number, layout, height, should be considered in the design of lightning arrester of local 30 years the gale wind strength, and have a certain margin.2, in order to reduce the lightning rod arrester to prevent acid rain on maintenance, corrosion, should be in the control center building roof installation stainless steel rod, its height and quantity according to the rolling ball method to calculate the protection range can cover the whole building center building surface and various types of antennas, which can effectively prevent direct lightning strike to protect the building roof and various types of communication security.In 3, along the road monitoring camera is mounted the tilt rod, toll station square head rod and LED sign top each installation of a stainless steel rod, to protect a pan-tilt camera and other equipment from lightning strike damage.In 4, highway toll station steel roof and large outdoor electronic screen top zygomorphic by installing a set of tower needle pointed lightning rod, to protect the toll station steel roof and electronic display frame structure against lightning damage.

Tall steel structure building fire safety measures

Steel is a kind of not extinguish the building material, it has the earthquake, flexural properties. In practical application, the steel can be increased relative to the building's load ability, but also can satisfy the construction design aesthetic appearance of the demand, and also prevents concrete and other building materials can not be bent, stretched defect, therefore, steel under construction industry favorite, monolayer, multilayer, skyscrapers, factories, warehouses, waiting room, lounge and using steel are common. However, steel building materials in fire prevention as there are some difficult to prevent defects, its mechanical properties such as tensile strength, yield point, and elastic modulus are as the temperature rises fall. The high-rise steel structure building is increasing, especially in some high-rise building steel structure, the more common way. High-rise building once fire accident, fire is not in a short period of time we fight, this requests us in the architectural design, increase building materials fire maintenance, in order to strengthen the fire resistance limit inside the building, and develop the necessary emergency plan, in order to reduce the casualties and property losses. Shrinkage. Using steel structure fire retardant coating maintenance component, this approachWith the fire insulation performance is good, the construction is not influenced by the geometric shape steel structure the advantages and restrictions, in general do not need to add auxiliary equipment, and the coating quality of light, there is a certain aesthetic decorative effect, which belongs to the modern advanced technology of steel structure fireproof measures usually at 450 degrees Celsius ~650 degrees Celsius in temperature will lose its bearing capacity, attack large deformation of steel column, steel beam bending, lead to, result from excessive deformation and cannot continue to use, and maintenance of ordinary steel structure fireproof limit is 15 minutes. This time also and component absorbing speed. To make steel structure information in the practical application of restraint fire area the lack of, must stop fire disposal, its purpose is to steel structure fire resistance design progress to standard rules limiting range of steel structure in fire to avoid rapid warming episodes deformation collapse, its measure is varied, the key is to take different measures according to different conditions, such as the use of insulation, refractory barrier direct flame ignition steel structure, reduce the heat transmission speed delay steel structure temperature rise, the weakening of time. But no matter in what way, its principle is different. Therefore,The author thinks the ideal of 4 kinds of steel structure fire protection measures must be pay attention to. Outsourcing layer. Take the words too literally, is in the steel surface to add outsourcing layer, can cast-in-situ molding, may also use the spray method. Cast-in-situ molding concrete outer layer usually with wire mesh or steel to enhance, to limit the shrinkage crack, and to ensure the strength of the shell. Spraying method to on site for the steel structure surface smearing mortar to form maintenance layer, mortar can be cement lime or gypsum mortar, also can be incorporated with perlite or asbestos. At the same time, outsourcing layer can also use perlite, asbestos, asbestos cement, gypsum or light made of concrete prefabricated plate, using adhesive, nails, bolts in steel structure. Water jacket hollow type steel structure filled with water is resistant to fire the most effective protection measures. This approach can make the steel structure in fire to low temperature, the water in the steel structure inner loop, absorbing its heating heat. The heated water cooling to stop recycling or by pipes into cold water to replace the heated water shield steel structure set in refractories consisting of a wall or ceiling, or member wrapped in two