Shrinkage installation of the Act is mainly used in the PV value larger bearings. Is well known, graphite bearing has a lower thermal expansion coefficient and elastic modulus, it is necessary that it is firmly held in the metal sleeve is very difficult. Therefore, only the beginning of high tolerances into graphite milk, do this, first cold inner bearing into the pre-heated to a certain temperature, the metal sleeve seat. Preheat temperature should be less than its maximum operating temperature. Followed by cooling the metal sleeve shrink, thus creating a certain pressure, the bearing in place. When using this method of installation, it should be noted: 1) bearing support must be in full contact with the outer surface of the bearing, it may crush bearings. 2) To select the exact size of carbon graphite bearing processing, even at the maximum operating temperature, should be subject to some residual stress of the bearing fastening. 3) With this installation method, when considering the bearing support materials should always try to get a bearing support bearing a certain pressure. For this reason, the best selection and the bearings have the same (or close to) the thermal expansion coefficient of the material to manufacture bearing support (ie bush). 4) when the bearing is used at or above 250 ℃ 250qC temperature condition, the bearing bush L) should have a very low coefficient of thermal expansion, in order to guarantee for the bearings to avoid damage. Especially for small bearings, but also pay attention graphite products, the best selection of low carbon steel thermal expansion coefficient of the material to do the bearing bushing. Experience has shown that when the bearing outer diameter of 25 mm, with the gap using a negative 0.1 - 0.15 mm is suitable. When the contraction is mounted to the bearing mounting method loquat aluminum or phosphor bronze (or the same material having a high coefficient of thermal expansion) of the bearing sleeve, there should absolutely be avoided exceed the allowable temperature range. Graphene named from the English graphite (graphite) + -ene (alkenes end), also known as "graphene." Graphene is considered planar polycyclic aromatic hydrocarbons atomic crystals. Its single atomic layer of carbon atoms arranged in a similar graphite, carbon atoms are sp2 hybrid orbitals form a honeycomb lattice (honeycomb crystal lattice) arranged in a single layer consisting of two-dimensional crystals. Graphene can imagine an atomic carbon atoms and its size network covalent bond formed. Graphene rolled into a drum-shaped carbon nanotubes can be used; in addition also made ballistic graphene transistor (ballistic transistor) and attracted the interest of a large number of scientists. In March 2006 graphite, Georgia Institute of Technology researcher announced that they succeeded in producing a graphene planar field-effect transistor, and quantum interference effects observed, and based on this result, developed a graphene substrate for the circuit. Sea Dragon graphene _ _ Carbon graphite provided by Carbon Co., Ltd. Weifang Sea Dragon. Carbon Co., Ltd. Weifang Sea Dragon (www.longmentanye.com) Shandong Weifang, graphite and carbon products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the North Sea Dragon carbon industry leadership with the staff warmly welcome all inquiries negotiations to create the North Sea Dragon carbon industry a better future.