Obama's "work plan"
The boom in 3D printing began in the capital market. In 2012, a series of companies in the United States engaged in 3D printing have all experienced substantial price increases, including 3D Systems, Stratasys, Ltd., and ExOneCo. Stratasys's stock market has seen a cumulative increase of 540% over the past year, and the stock price of just-listed ExOne has also risen by 47%.
The enthusiasm of investors naturally attracted the attention of the media. The British "Economist" thinks in the special topic that 3D printing will subvert the advantages of scale production, lower the threshold of design, change the geographical structure of the supply chain, and describe 3D printing as the third industry experience in the world today. The sub-industrial revolution is an important part of the digital revolution.
Chris Anderson, editor-in-chief of Wired magazine, gave up his job as editor-in-chief and turned to the 3D printing industry as the CEO of 3DRobottics, his 3D printing manufacturing company.
The popularity of 3D printing has led the U.S. president to include it in his "work plan." In February of this year, Barack Obama emphasized the importance of 3D printing technology in his nationwide State of the Union address speech, saying that it will accelerate the growth of the U.S. economy. Obama pointed out: The government has not only established the first manufacturing innovation center in Youngstown, Ohio, but also three innovative research centers are under preparation. It will eventually develop into a nationwide network for 3D printing and manufacturing, and some backward areas in the United States. Will once again create miracles and become a new global high-tech center.
At present, domestic companies are also gaining momentum in the application of 3D printing technology. 3D printing technology is being accepted by the general public and has been widely used in aerospace, automotive parts, major equipment, cultural creativity, and biomedical fields. According to the latest report, the overall market for global 3D printing equipment and services in 2012 was US$2.2 billion, of which the US accounted for approximately 60%, and Germany, Japan, and China each accounted for approximately 10%.
Leading the third industrial revolution?
Can 3D printing really become the key to the opening of the third industrial revolution as people think?
For some people, the answer is definitely yes. "3D printing is an important part of the third industrial revolution and an important area." Xu Zhilei, a member of the Chinese Academy of Engineering and a fellow of the China Academy of Engineering Physics, stated at the 3D printing industry technology conference recently held.
Indeed, compared with traditional manufacturing technologies, 3D printing has obvious advantages such as low processing costs, short production cycles, and material savings, and it can be used in a wide range of fields including aviation and power equipment to medical, sports, and film and television.
At present, 3D printing technology has gradually integrated into all areas of manufacturing, from aircrafts, racing cars, to clothing and mobile phone shells. In the United States, low-cost, easy-to-operate small home 3D printers have even reached the “per 4 km range. There is a degree of popularity.
Of course, we cannot simply think that 3D printing has become an ideal manufacturing method. In fact, 3D printing is still constrained by the high cost of materials, low molding precision, and poor manufacturing efficiency, and it is still away from the “mass production system, flexible manufacturing system, and reconfigurable production system†required by the third industrial revolution. Far away.
Killing traditional manufacturing?
In the eyes of more 3D printing practitioners, it is unrealistic to expect 3D printing to replace traditional manufacturing.
In practical use, due to the difficulty in research and development of materials used for color-enhancing manufacturing, the cost thereof generally ranges from 10 to 100 yuan per gram, and the amount per hour, if metal processing, can reach 100 to 3,000 grams. This cost obviously far exceeds the public's tolerance. More importantly, due to the high energy consumption and certain dangers of using metal 3D printing, most current home 3D printers can only use a single plastic material, which also greatly limits their practicality.
On the contrary, combining with traditional industries is the way out for the 3D printing industry.
Shi Yusheng, the co-director of the China 3D Printing Technology Industry Alliance and vice president and professor of the Huazhong University of Science and Technology Materials Institute, pointed out: "This technology (3D printing) does not replace the traditional technology, but is combined with the traditional technology." And 3D printing Terry Wohlers, chairman of the company Wohlers Associates, said that the largest market for 3D printing is to provide parts for the final product.
So, how do we really understand the changes that 3D printing technology will bring to our lives? With reference to the popularity of personal computers in the 1970s and 1980s, it may be possible to come up with a good answer. Once, many people questioned the need for personal computers, and personal computers at the time were indeed expensive and primitive. But history has finally proved that this machine that can make people creative has entered people's lives and has also changed people's lives.
Thirty years later, 3D printing technology may also be on this path.
Geogrid is divided into plastic geogrid, steel-plastic geogrid, glass fiber geogrid and polyester warp knitting polyester geogrid four categories.
Plastic grille
The tensile direction of the polymer net, which has a square or rectangular shape, can be stretched in one direction and two - way.It is extruded through extruded polymer sheets (mostly polypropylene or hdpe), and then directional stretching under heating conditions.The unidirectional tensile grille is only drawn along the length of the plate.The bidirectional tensile grille continues to stretch the grid of unidirectional stretching in a direction perpendicular to its length.
Due to the rearrangement of polymer polymers in the manufacture of plastic geogrid, the bonding force between the molecular chains is strengthened and the purpose of enhancing the strength is achieved.Its elongation rate is only 10% ~ 15% of the original plate.If the anti-aging materials such as carbon black are added to the geotextile grille, it can have good resistance to acid, alkali resistance, corrosion resistance and aging resistance.
Steel plastic earthwork grille
Steel-plastic geogrid with high-strength steel wire (or other fiber), through special processing, with polyethylene (PE), and add other additives, by extrusion compound high strength resistance to stay with it, and we have rough surface embossing, is for the high strength reinforced belt.From this, the single belt is prepared or sandwiched by a certain spacing, and the welding technology of special strengthening adhesion is welded to the contact point, and it is a reinforced soil grate.
Product features:
Large strength and small deformation;
Creep decreases;
Corrosion resistance and long life: the steel plastic earthwork grille is made of plastic material as protective layer, with various auxiliaries to make it anti-aging, oxidizing property, acid, alkali, salt and other bad environment corrosion.Therefore, the steel and plastic earth grate can meet the requirements of all kinds of permanent works for more than 100 years, and the performance is excellent and the dimension stability is good.
Construction convenient and quick, short cycle, low cost, steel-plastic geogrid laying, easy lap, positioning, leveling, avoids overlapping cross, which can effectively shorten project cycle, engineering cost saving of 10% 50%.
The glass fiber
Glass fiber geogrids is fiber glass material, adoption of a certain mesh structure material made of weaving process, to protect the glass fiber, improve the overall performance, after the Shanghai juji process of special geotechnical composite material.Glass fiber is the main ingredient: silicon oxide, inorganic material, its physical and chemical performance is very stable, and has great strength, high modulus, high wear resistance and excellent cold resistance, no long-term creep;Good thermal stability;The reticular structure allows the aggregate to be interlocked and limited;To improve the bearing capacity of asphalt mixture.Because the surface coating has special modified asphalt, it has two heavy compound properties, which greatly improves the abrasion resistance and shear ability of geogrid grate.
Features of glass fiber earthwork grille:
High tensile strength and low elongation - fiberglass earthwork grille is made of fiberglass and has high resistance to deformation, and the fracture elongation is less than 3%.
No long-term creep - as reinforced material, has the long-term load ability to resist deformation under the condition of the creep resistance is extremely important, creep, glass fiber does not happen this ensures that the product can keep for a long time performance.
Thermal stability, fiber glass melting temperature above 1000 ℃, that ensures that the fiberglass geogrid under thermal stability in the paving operation.
The compatibility with asphalt, fiberglass geogrid in the post-treatment process of coating material for asphalt mixture design, each fiber were coated in full, the compatibility with asphalt has the very high, thus ensuring the fiberglass geogrid are produced in the asphalt layer with asphalt mixture segregation, but strong together.
Physical and chemical stability, after special treatment for coating processing, glass fiber geogrids can resist all kinds of physical abrasion, and chemical erosion, also can resist against erosion and climate change, to ensure its performance is not affected.
Aggregate interlock and limitation - because of the network structure of glass fiber earthwork grille, the aggregate of asphalt concrete can run through it, thus forming mechanical locking.Such restrictions hamper the aggregate movement, the asphalt mixture in the load to be able to achieve better compaction state, higher bearing capacity, better load transfer performance and small deformation.
Polyester fiber warp knitting
Noil product introduction
The warp knitting polyester geogrid is a kind of reinforced embankment of new geotechnical base material with high quality, adopt high-strength polyester fiber as raw material, and after the warp knitting direction detection rubberized coating by the special craft processing and become.
Noil product features
The warp knitted polyester grille has high tensile strength, small elongation, corrosion resistance, aging resistance, strong bite force, light weight and drainage.
Noil product use
Road, railway, municipal road and other road soft soil roadbed reinforced, can effectively improve the strength of roadbed, delay the reflection crack of road;2. Reinforcement and isolation of levees and watercourses in water conservancy projects, strengthen the foundation of soft soil, enhance its protective ability and improve the bearing capacity and stability of the foundation;3. Used for embankment slope reinforcement, retaining wall and reinforcement, enhancing the overall strength.
feature
High strength, small creep, suitable for all kinds of environmental soil, can satisfy the high grade highway high wall to use.
It can effectively improve the embedded lock, occlusion action of the reinforcement load, the bearing capacity of the foundation and the lateral displacement of the soil, and strengthen the stability of the foundation.
Compared with the traditional grille, it is more powerful, bearing capacity, anti-corrosion, anti-aging, large friction coefficient, uniform eye, convenient construction and long service life.
More adapted to the deep sea homework, embankment reinforcement, fundamentally solves the other materials do stone cage by long-term water erosion caused by the low strength, poor corrosion resistance and short service life and so on.
Can effectively avoid the construction damage caused by the crushing and damage during construction
It is applicable to the road base of various roads, railways and airports.
It is applicable to the large parking lot and terminal depot.
Suitable for railway and highway slope protection.
Applicable culvert enhancement.
It is suitable for the second enhancement of the soil slope after the reinforcement of the unidirectional stretching geogrid, and the soil slope is further enhanced to prevent soil erosion.
Reinforcement of mines and tunnels.
Application
Earthwork grille is suitable for all kinds of embankments and roadbed reinforcement, slope protection and wall reinforcement.The large airport, parking lot, wharf and other permanent bearing foundation reinforcement.
Earthwork grille is used to increase the bearing capacity of road base and prolong the service life of road base.
The earthwork grille is used to prevent the surface of the road from collapsing or causing cracks to keep the ground beautiful and orderly.
Earthwork grille is used for construction convenience, save time, save effort, shorten construction period, reduce maintenance cost.
Earthwork grille is used to prevent culvert from producing cracks.
Earthwork grille is used to enhance soil slope to prevent soil erosion.
Earthwork grille is used to reduce cushion thickness and save cost.
Earthwork grille is used to support the stability of the slope planting MATS
Geogrid
Steel Plastic Composite Geogrid,Steel Plastic Geogrids,Steel-Plastic Biaxial Geogrid,Plastic Pp Uniaxial Geogrid
ZHEJIANG BOYA COMTECH CO.,LTD , http://www.zjbytx.com