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Energy-saving heat treatment skills and equipment in the bearing profession (1)
Source: Bearing network time: 2013-09-03
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China's bearing import and export trade volume has increased year by year. In 2007, bearing exports earned 2.1 billion US dollars; import used foreign exchange 2.1 billion US dollars; import and export equal.
Since the "Ninth Five-Year Plan"; China's bearing professional economic component has undergone in-depth changes. By 2006; accounting by sales; has constituted state-owned: private: three capital = 16:63:21 format.
China's bearing professional skills level has gradually improved; has a certain skill strength. There is one (Luo axis institute), one hospital (China Machinery Ten Institute), one school (Henan University of Science and Technology) as a support. 5 (universal, tile axis, Kazakhstan axis, Luo axis, northwest), postdoctoral research stations 5 (Wanxiang, Longxi, Luoxuan, Northwest, Hangzhou), 6 national laboratory (Luo axis office) , Hangzhou Intermediate, Shanghai Institute, Wanxiang, Longxi, Wazhou). The development of product development in the whole profession can be greatly improved; the standard of bearing types has been increased from 39,000 in 1999 to more than 66,000 in 2005. The matching rate of serious equipment and main points has reached 80%. The development of high-end products has made serious breakthroughs. The aerospace bearings and other defense equipment supporting bearings are represented by the supporting bearings of “God Fiveâ€, “Shenliu†and “Changyi No.1â€. All of them have been settled in the country; they have completely independent intellectual property rights. They have long been constrained by the domestic mainframe supporting and expanding the export of micro-miniature deep groove ball bearings with oscillating noise and sealing function problems; after the Chinese Axis Association arranged full vocational skills research; The effect is basically satisfied with the domestic host supporting and expanding export demand; the products of some companies have reached the level of similar products in the world.
2. China's bearing heat treatment skills and equipment have made great progress in the "sixth five-year", "seven-five", "eight-five" economic construction period; there are more than 20 bearing production companies from Japan, the United Kingdom, the United States, Switzerland, West Germany, Austria The use of equipment introduced by industrialized countries such as Italy, digestion and absorption; the first type of equipment in the middle of the "eight-five" period has completely completed the localization; effectively promoted the skill progress of China's bearing heat treatment equipment and the production level of electric furnace occupation.
The pusher type isothermal spheroidizing annealing furnace is widely used in the bearing profession; currently this type of equipment is the primary equipment for annealing the bearing parts. The bearing parts are guaranteed to be atmospherically annealed and lead to attention; and the beginning is widely used in production.
The quenching and tempering equipment for bearing parts mainly includes mesh belt furnace, casting chain, roller hearth furnace, multi-purpose furnace, rotary hearth furnace and drum furnace production line; these production lines are the main equipment of China's bearing professional heat treatment equipment; also represent China's bearing heat treatment Equipped with the level; the promotion and application of these equipments; greatly improved the quality level of heat treatment of bearing parts in China; the oxidized decarburization layer of the workpiece after quenching was reduced from the original 0.06 ~ 0.1 mm to below 0. 03 mm; the difference in batch hardness was originally The 2HRC drops below 1.5 HRC; the difference in hardness of the same piece is reduced from the original 1.5 HRC to less than 1 HRC; the tightening grinding retention is 1/3 to 1/2; the progressive grinding power is 15% to 22%; Advance in the overall level of quality has been made.
Carburizing heat treatment equipment mainly has putter type, roller bottom type, mesh belt type gas carburizing active production line; also has multi-purpose furnace, vacuum carburizing furnace, well type furnace, periodic carburizing furnace; carbon potential control of carburizing atmosphere Most use active control system; also use flow control.
3. China's bearing heat treatment skills and equipment development direction (1) small and medium-sized bearing rings large-volume production heat treatment equipment with no Mavto roll-type controllable atmosphere mesh belt furnace production line, controlled atmosphere casting chain furnace production line; alternative conveyor belt furnace, Vibration furnace, box furnace and other backward furnace type.
(2) Large-scale and large-sized bearing rings are produced in large quantities, and heat treatment equipment is used to select the controlled atmosphere roller bottom furnace production line and multi-purpose furnace production line.
(3) The heat treatment of extra large bearing rings is equipped with a controlled atmosphere periodic heat treatment furnace or a pit furnace with a microcomputer carbon potential control device.
(4) Development of a controlled atmosphere with a nitrate salt martensite quenching small roller furnace and a roller bottom furnace production line.
(5) Promote the use of continuous controllable atmosphere carburizing production line.
(6) Development of high-frequency quenching and tempering active production line for automobile wheel bearings.
(7) The bearing tumbling body is mass-produced and heat-treated with the selection of the drum furnace production line; instead of the imitation Su drum type furnace production line.
(8) Development of roller bottom type nitrogen-based atmosphere isothermal spheroidizing annealing furnace.
(9) Develop and apply the lower bainite austempering process equipment.
(10) Develop and develop active die-hardening machine tools for controllable atmosphere roller hearth furnace and rotary hearth furnace.
(11) Increase the share of vacuum heat treatment equipment.
(12) Develop and develop a quantity-variable sorting machine matched with the mesh belt furnace and the casting chain furnace production line.
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