China's bearing industry began construction in 1950. After half a century of development, it has formed a relatively complete and complete production and technical system. It has become the fourth largest country in the world in bearing production after Japan, the United States and Germany, and has gained worldwide attention. Achievements. However, compared with the developed countries of the bearing industry, there is still a big gap in China's bearing industry. Mainly manifested in:
First, in terms of varieties, there are currently about 150,000 varieties of bearing products in the world. The cumulative production in China has only been more than 20,000, and most of them are general-purpose products.
Second, in terms of production capacity, China currently has more than 2,000 bearing manufacturers, which is 5-6 times that of other countries in the world. However, the country's total annual output value is only equivalent to the sixth-ranked US TIMKEN company (about 21 billion yuan); compared with the first-ranked Swedish SKF company, it is only equivalent to its annual output value (about 40 billion yuan) Half; compared with Japan, it is only about 10% of its annual output value.
Third, in terms of dimensional tolerance and rotation accuracy, although China's bearings are close to the level of foreign famous brand products, there is still a big gap in the dispersion of dimensional deviation. In addition, foreign countries have already begun to study and apply such fine rotation accuracy indicators as "non-repeatable beating", and China's research in this area is still blank.
Fourth, in terms of high-speed performance, the DmN value of foreign famous brand products is 4×106mm·r/min, while the bearing in China is only 2×106mm·r/min.
5. In terms of vibration, noise and noise, Japan has introduced silent and ultra-quiet bearings, and the vibration (acceleration) extreme level of China's bearings is generally more than 10dB compared with Japanese products.
Sixth, in terms of life and reliability, taking deep groove ball bearings as an example, the life of foreign famous brand products is generally more than 8 times the calculated life (up to 30 times or more), and the reliability is 98% or more (or pursue with the host, etc.) Lifetime), and the life of our bearings is generally only 3 to 5 times the calculated life, and the reliability is about 96%.
Seventh, in the bearing application technology of special working conditions, there is a considerable gap in China's bearings.
It is precisely because of the shortage of bearing specifications and performance quality in China's bearings, therefore, not only in the export, most of them are low-end products, the average price of each set of bearings is only about 0.4 US dollars, without any technical competitiveness, and In some important domestic host or field, such as civil aviation aircraft, high-speed rail passenger cars, mid-to-high-end cars, computers, air conditioners, and imported major equipment, basically the imported bearings are “unified in the worldâ€. These industries or fields are mostly pillar industries or sectors of the national economy.
In summary, the rolling bearing is not a simple mechanical component in the usual sense, but a mechanical product carrier that contains a wealth of technical connotations. As a mechanical basic industry, the bearing industry has a high level of technology and has a certain representative significance for a country's industrial technology development level. If a country that does not have a bearing industry is not a fully industrialized country, then a country that does not have advanced bearing technology is hard to say that it is a country with advanced manufacturing technology. Compared with the advanced foreign technology level, China's bearing industry still has a big gap. Therefore, it is even more necessary for the country to stand at the strategic level and provide more and greater support.
Rivets
Rivets are a permanent mechanical fastener. Before being installed a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place.Rivets Categories:
About Rivets,it is also belong to connecting and fastening,
Normally it can be divided into several categories:Solid Rivets,Rivet Nuts,Blind Rivets and so on.
And our Non-standard Rivets can be produce according to drawings and samples.
We have ability to control the quality during production before sending to customers. We wish to do your best supplier of Rivets in China..
Rivets Purpose:
We are manufacture to supply our Rivets to our customers,We Have responsibility to give our best goods with good quality . So we will track all step to customers at all times. such as: products requirement,Technology and property ,package,shipment ,and files ,and sales serve,
Welcome all of you to contact with us,we promise to give our the best We are improving as your supporting.
Rivets are a permanent mechanical fastener. Before being installed a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place.
Rivets Categories:
About Rivets,it is also belong to connecting and fastening,
Normally it can be divided into several categories:Solid Rivets,Rivet Nuts,Blind Rivets and so on.
And our Non-standard Rivets can be produce according to drawings and samples.
We have ability to control the quality during production before sending to customers. We wish to do your best supplier of Rivets in China..
Rivets Purpose:
We are manufacture to supply our Rivets to our customers,We Have responsibility to give our best goods with good quality . So we will track all step to customers at all times. such as: products requirement,Technology and property ,package,shipment ,and files ,and sales serve,
Welcome all of you to contact with us,we promise to give our the best We are improving as your supporting.
Rivets,DIN124 Steel Round Head Rivet,Solid Rivet fastener Zinc plated
Suzhou Gubao Screws Co.,Ltd. , https://www.gbscrewes.com