A Brief Introduction of Heat Sink

What is Heat Sink?


Heat sink is a cooling device for electronic components easy to heat in electrical equipments. Most of them are made of aluminum alloy, brass or bronze into plates or flakes, such as the sizable heat sink computer CPU central processing unit needs, and power amplifier tubes of power tubes, switching transistors, and power amplifiers in televisions need.



Generally, when the heat sink is being used, the contact surface between electronic components and heat sink should be coated with a layer of thermal grease, enabling more effective conduction of heat from components into heat sink and distribution of heat from components into the air.
Classification of Heat Sink



As far as heat sink material, thermal conductivity properties of each material are different. As heat-conducting property flows from high to low, namely, silver, copper, aluminum, steel. However, silver costs much for heat sink. So it is the best option to use copper. Although aluminum heatsink is much cheaper, apparently its thermal conductivity property is worse than copper's (about 50% of copper's).



Nowadays, the common heat sink material is copper and aluminum. Both of them have advantages as well as disadvantages. Thermal conductivity of copper is good, but it is more expensive with higher processing difficulty, and over large weight (many pure copper heat sinks' weight exceeds the weight limit of CPU). Besides, copper heat sink enjoys smaller heat capacity, and prone to oxidation. On the other side, pure aluminum is too soft to use so that only aluminum alloy can provide enough hardness. The advantages of aluminum alloy are cheap and in light weight, but the disadvantage is its bad thermal conductivity. Some heat sinks take what they need. Thus some aluminum heatsinks are implanted a piece of copper plate.
For ordinary users, the aluminum heat sink has been sufficient to meet their thermal requirements. In the North, the heating radiator for getting warm in winter is also known as the heatsink.



Heat sink occupies an important role in the composition of radiator. Other than active cooling of the fan, to evaluate a heat sink largely depends on the heat absorption capacity and heat conduction of the heat sink itself.

Aluminum Extruded Heat Sink



This is excellent material widely used in modern thermal dissipation. Most of the industry is using 6063 T5 high-quality aluminum, whose purity can reach more than 98%, heat conduction ability is strong, density is small, and price is low so that it has been favored by the major manufacturers. Based on hot resistance of Intel and AMD CPU and considerations of their heat productivity, aluminum extrusion manufacturers develop corresponding mold, heat up aluminum ingots to a certain temperature, make its physical form changed, and then get various types of heat sink raw materials we want. At last, we can use them after cutting, grooving, polishing, burring, cleaning, and surface processing.



www.heatsinkvet.com is a committed professional manufacturer of 3C (computers, communications, consumer electronics) and industrial heatsink. Our productive technologies include the following entire production and processed progress: Cutting off, cutting groove, stamping, drilling, tapping, CNC, relieving teeth, drawing bench, polishing, sandblasting, anode, assembly, etc. We sincerely hope to provide best products and service to customers. Welcome to browse our website!



The article is come from:http://www.soundspeakers.cn/index.php/a-brief-introduction-of-heat-sink.htm
More about my article, you also can read:http://industrialaterials.blog.fc2.com

Daily Maintenance of Transformers

Allowed Temperature of Transformers



When transformer is operating, the coil and core generates the copper and iron losses, and these losses turn into heat energy, so that the core of the transformer and the coil temperature rises. If the temperature for a long time exceeds the allowable values then it causes the insulation to gradually lose their mechanical flexibility of insulation aging. During transformer operation when the temperature of each portion is not the same, the maximum temperature of the coil, followed by a temperature of the core, the insulating oil temperature is lower than the temperature of the coil and core. Allowable temperature in the operation of the transformer top oil temperature should be checked.ei core transformer of Class A is in the normal operation, when the ambient air temperature of up to 400C, the limit operating temperature of the transformer windings is 1050C.

Allowable Temperature Rise of the Transformer



Only monitor the upper layer of oil temperature in the running mains isolation transformer, this cannot guarantee the safe operation of the transformer, and must also monitor the temperature difference between the top oil temperature and the cooling air, - that the temperature rises. The temperature of the transformer and the ambient air temperature difference, referred to as the temperature rise of the transformer. A grade insulation transformer, when the maximum temperature is around 400C, the national standards winding temperature rise to 650C, the top oil allowable temperature rise to 550C. The transformer temperature does not exceed the specified value, will be able to ensure safe operation within the specified operating life of the transformer at rated load.

The Overload of the Transformer



The overload stars normal accident loads and overload both cases. Normal overload is caused by the case of the normal power supply, the increase in electricity consumption. Transformer temperature will rise, and resulting in the transformer insulation accelerated aging and reduces the life of, and therefore, under normal circumstances we do not allow the load operation. The special case of the transformer in a short time overload operation, but shall not exceed the rated load in winter 30%, summer shall not exceed 15% of the rated load. In addition, it should be based on the temperature rise of the transformer and specified by the manufacturer to determine the overload capacity of the transformer. When the power system or user substation has an accident, in order to ensure a continuous power supply to the vital equipment, it allows the transformers short time overload operation.



www.mainstransformer.com is an advanced enterprise specializing in kinds of mains transformer producing. As the professional manufacturer of customized mains transformer especially low transformers and circuit board transformer, we can produce customized mains transformers in different power and output / input current.

The article is come from:http://www.chinaphoneparts.com/index.php/daily-maintenance-of-transformers.htm

Development Focus of China's Fastener Industry

Chinese Industrial Fasteners Status Quo



Fasteners is not the production fixed product, but to provide users with the processing fastening services; technology and the process level is of course important, but more important is the level of management, because every aspect of the production has the potential to create profits. China is lags far behind than many foreign enterprises in the management aspect, we only have equipment and technology, there is no high-quality personnel and management protection, then the fasteners available in large quantities is not possible to achieve. The export situation in 2012 is more severe. Therefore, the fastener enterprises should have a clear understanding of and should pay attention to the adjustment of export regions, and to explore potential markets in South America, North America, Asia, Southeast Asia and other regions.

China Fastener Industry Development in 2012



Fastener industry, in 2012 main theme of its development "to maintain growth, note the people's livelihood and promote employment," will continue to show the first low after rise and then a new increase" situation. From the fourth quarter of 2011 to the first half of 2012, subject to objective environmental impact,stainless steel wood screws industry development speed will slow down, fastener companies must adhere to innovation and adjustment and transformation, we must continue to closely rely on the car, the new energy, aerospace, shipbuilding, urban transport, IT, electronic appliances, construction and other key industries, to accelerate the fastener product optimization and upgrade and to promote the healthy and steady development of the whole fastener industry. Fastener Association Forecast: in 2012,bolt and nuts fasteners total output is expected to reach 680 million tons. But there is a process, fasteners production enterprises should now plan to consider funds for innovation and technological upgrading, to improve equipment intelligent level, and to enhance the online detection level.

Chinese Fasteners Industry Development Issues



Compared with the United States, Japan and other manufacturing powers, there are still large gaps in China's fastener industry. American enterprise is characterized by large-scale, automated, digital production, CNC technology, network technology and digitization control technology is mature, from design to all sectors of production sharing, there is a high degree of production management information. Specific performance: First automated production is more secure, reliable, easy maintenance of the entire bolt, nut production lines running; safety awareness presses installed safety grating; improve the management level of the company's management information system application and production efficiency, enterprises have their own management information systems, supply of raw material suppliers material with a bar code; Fourth, although the relatively large size of the business is big, but the product line is not great, and the production volume of the product is great.



www.stainlesssteel-fasteners.com is a professional manufacturer of motors, electrical appliances, hinge, furniture, machinery and stainless steel hardware accessories. Our main products are including: nuts and bolts, small screws and other series!

The article is come from:http://www.stainlesssteel-fasteners.com/news/9.htm

The Characteristics of the Moon cake Tin Packaging

Innovative type

Over the years, there are two types in the moon cake traditional tin packaging, one is the square tin installed with 4 cakes, and the other one is the round tin can loaded with eight moon cakes. Recent years, with the changes of people's consumption demand and consumption levels, not only moon cake itself is given a new meaning, but also higher requirements are put forward on the moon cake tin packaging. The tin packaging with novel structure, beautiful shape, various function has become an important factor in selecting moon cake packaging.

The flat-screen combination type

Moon cake box consists of two parts, the outer layer is designed tray, and the inner layer is combined of four separate fan-shaped tin circles, and the entire circular pattern is an organic whole. The outer layer is designed custom tin box or tray, the inner layer is composed by a small fan and a larger round tin can to form a whole through the structure and pattern design.

Transplant type

Hexagonal deep cover sleeve fit cans take use of a small arc transition in the corner of the container body, after the projecting of the tank bottom connected with the cans roll molding, the can lid is divided into two parts, the same as the cover body and the molding process of the container body . The outer edge of the cover the top of the drawing, the depth and the cover body of the inner bead are in the same height. The top surface cover is flat. It is combined with the shape characteristics of cake plastic box, together with the elegant colors and patterns, giving a feeling of luxury.
The function type
Multi-function is an important way to expand moon cake tin packaging market when guarantee the moon cake packaging performance. For example, the shape of the tin like chocolate tin box, which is composed of six semi-circular petals and it can also be used as a candy box. In addition, hand push children moon cake tins can be used as stationery. Furthermore, the moon cake barrels can be used to hold tea or other food.

Profile type
Profiling moon cake tin packaging can give full play to the advantages of the iron in the processing and printing, and choose the shape with the symbolic significance as a model. Profiling type moon cake tin packaging is mainly used independent of a single moon cake packaging. For example, the heart-shaped tank can express love; scallop-shaped tank gives a feel of novel and high-end. The similar profiling moon cake tin packaging, can be matched with the corresponding pattern, which can also be used to hold jewelry.

www.tinbox6.com
We have three companies to offer a full line of tin boxes. The printing company imported FUJI double color printing machines from Japan, so that we can control the printing quality, delivery time and cost well. Moreover, two other companies are for tin boxes production: one is for Chemical paint cans, oil cans and the other is for ice buckets, metal trays and tin boxes. 

The article is come from:http://fashion.jewellryboxes.net/custom-rubber-products/the-characteristics-of-the-moon-cake-tin-packaging.htm

An International Wind is Sweeping Xintang Denim Industry

The International Road of Chinese Denim

"The world's denim settles in China, and Chinese denim settles in Xintang." In China, the each ten jeans exported to all over the world, 4 of them are manufactured in Xintang. The "gateway to the world" - the slogan of the Italian fashion design port showed on scene located in Xintang, Guangdong Province, China, and this slogan leave impressive impression for the people come here. The officially launched Chinese - Italian fashion design port is an open public service platform, a studio for the exclusive use by the Italian designer, to release the latest works of the exhibition center, network information center of the global apparel trend will provide the denim costume design, pattern design, image design, professional consulting, services and outsourcing diversified services for Xintang, Zengcheng, Guangdong, China. – With the setting sail of Italian fashion design port (Xintang), marking cooperation in the areas of brand development, creative design, R & D, talent exchange has entered a stage of high-level update development.

Transformation Assist Denim Industry Rise against Wind

Xintang denim industry step a solid pace from "manufacturing" to "creating" in the critical transformation and upgrading. Here gradually formed a consensus: to promote the transition to creative design, invisible wings to plug in the denim industry. The leap-forward development of Xintang denim industry also brings many Chinese wholesale fabric suppliers the unlimited business opportunities. Enhanced between Xintang Jeans R & D design, brand marketing, fashion and Milan cultural functions by such international creative design and fashion culture are interactive, Italy, apparel Cultural Park through the construction of clothing design platform to expedite the implementation of denim garment industry transformation and upgrading, thus promoting urban transformation and upgrading.

New Technology Leads the Denim Ecological Civilization

Without water and chemical additives G2 color (rinsing) processor, especially suitable for the use of SMEs like sewage treatment equipment such as washing machines the size of a removable top international digitization jeans sewing professional equipment. In the First Guangzhou Zengcheng International Textile and Garment Advanced Equipment Exhibition, the advanced denim clothing and equipment make the Zengcheng denim clothing practitioners amazed again and again, these state-of-the-art equipment, technical maturity and cost have been merchants can accept the range to make denim fabric production perfectly placed to become a green manufacturing. Promote the use of advanced equipment, to subvert the people's impression of the clothing manufacturing industry, the apparel production industry technology and equipment upgrades can become a green manufacturing industry, in the creation of wealth, while also creating ecological civilization, and it should be vigorously promoted.



www.Chinesefabrics.net is by far the sole southern R & D base of China's fashion fabrics authorized by China National Textile Industry Council, as well as the second largest industrial park in Nanhai district. We are specialized in the R & D, production and sales of chemical fabric , suiting fabric, jacquard fabric, and denim fabric. Welcome to visit our page for more details!



More about my article, you also can read:http://industrialgoods.overblog.com/

Temporary Tattoos Swept the World

Get rid of tattoo is not a very easy thing

The tattoo is to use the needle with ink to pierce into the layers of skin and manufacture some pattern or word on the skin. People embroider a variety of patterns on the body to show auspicious and worship. The tattoo once brought a lot of joy for most men and women seeking fashion, but with the growth of these people, these tattoos enable the patients to be painful. What is the tattoo removal method? Experts introduce that human skin is divided into a shallow layer epidermis and dermis layer, among which the epidermis can be updated and quickly shedding. The tattooing pigments are generally implanted in the dermis which are permanent and cannot disappear on their own. So get rid of tattoo is not a very easy thing.

Temporary tattoos are loved by the young people and swept the world

Many young people love tattoos, but fear of the injury brought by tattoos, which spawned the birth of painless tattoo. Painless tattoo is also known as temporary tattoo. The best temporary tattoo is the pattern sprayed by the spray gun. It can depict beautiful pattern on the body, which is the perfect combination of tattoos and art. The cultural phenomenon of painless tattoos integrated "fashion" and "popular". With the culture displayed by the body gradually rise, to make people accept the expression patterns of the body, the tattoo has become a social work of art, and famous tattoo master is regarded as the artists. Because compared to traditional tattoo, the temporary tattoo neither harm the skin, nor painless, not afraid of washing and can also keep about seven days, and can be replaced with your favorite pattern at any time, so it is loved by the young people and swept the world.

Temporary tattoo features:

1. Temporary. The temporary tattoos can be stored in the body for up to 15-60 days, and the pattern can be freely transformed according to your personal preferences.
2. Environmental protection. The temporary tattoo pigment is non-toxic and harmless on the body, does not have any side effects, and contains a variety of natural plant extracts, customers can be assured to use.
3. Diversity. The wholesale temporary tattoos template covers people, animals, flowers, Totem, cartoons, and many other categories, a very wide range of patterns are available for customers to choose;
4. Low price. Compared to tattoos and art painting, the price of temporary art tattoos has a great advantage. You can enjoy the perfect body art at low cost, which has a lot of allure for the majority of consumers.
5. Quality patterns. The temporary art tattoo templates are completed by professional temporary tattoo designers and engineers, the template itself contains a very high artistic value.

www.tattoomanufactory.com is a professional tattoo manufacture and has been specialized in temporary tattoo since 2002. We aim to be the most professional tattoo manufacturer and provide competitive price, quality guaranteed products and professional service.

If you are interested in our products, please feel free to contact us!

Die-casting Process Introduction

What is the Pressure Die Casting?

The substance of high pressure die casting is also referred to as die-casting which is under high pressure, so that the liquid or semi-liquid metal is filled at a higher speed type casting (die casting mold) cavity, and molding under pressure, and solidification was obtained in the casting method. The high-pressure and high-speed filling die-casting is the two main characteristics of the die-casting. It is commonly used in injection pressure from a few thousand to tens of thousands of kPa, and even up to 2 × 105kPa. Filling speed is about 10 to 50m / s, sometimes even up to 100m / s or more. The filling time is very short, usually in the range of 0.01 ~ 0.2s.

Die Casting Process Advantages

Compared with the other casting methods, the die casting has the following three advantages:

Product quality: high dimensional accuracy of castings, generally the equivalent is 6 to 7, even up to four; surface finish is generally equivalent to 5 to 8; higher strength and hardness, strength is generally increased by 25 to 30 than sand casting, but the elongation is reduced about 70%; dimensionally stable, good interchangeability; complex die casting thin-walled castings. For example, zinc alloy die castings minimum wall thickness is up to 0.3mm;aluminum alloy die casting can be up to 0.5 mm. High production efficiency: machines with high productivity; die-casting has long life, and a pair of type casting, the life of die casting bell alloy expectancy is up to hundreds of thousands of times, or even millions of times; easy to realize mechanization and automation. The excellent economic effects: due to the exact size of die castings and smooth table pan. Generally, it is directly used and without machining and the processing volume is very small, so not only improves the metal utilization, and reduce a lot of processing equipment and working hours; castings price is very cheap, combination of die-cast metal or non-metallic materials is available.

Applications and Trends of Pressure Die Casting

High pressure die casting is one of the most advanced metal-forming methods and it is the effective way to achieve less chips and no chips, the application is very wide, and it has developed rapidly. Now the die casting alloy is no longer confined to the non-ferrous metals zinc, aluminum, magnesium and copper, and has gradually expanded to be used die casting of cast iron and steel castings. The size and weight of the die casting depends on the power of the die casting machine. The increasing power of the die-casting machine, casting shaped size can be from a few millimeters to 1 ~ 2m; weight can be from a few grams to tens of kilograms. At abroad, the die casting diameter is 2 m and a weight is 50kg of aluminum castings. Die castings are no longer limited to the automotive industry and instrument industry, and gradually expand to other various industrial sectors, such as agricultural machinery, machine tool industry, the electronics industry, the defense industry, computers, medical equipment, watches, cameras and daily hardware industries.



www.pressure-die-casting.net is a professional zinc, aluminum high pressure die casting and magnesium molds (toolings) designer and manufacturer. We specialize in aluminum die cast, zinc alloy die casting parts, post-process CNC and surface treatment. We are licensed to export toolings (molds) and pressure die castings. Any interests in our products? Come to have a visit our page! We will never let you down!



The article is come from:http://www.pressure-die-casting.net/diecasting/index.php/die-casting-process-introduction.htm