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Energy-saving heat treatment skills and equipment in the bearing profession (3)
Source: Bearing network time: 2014-09-08
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
This furnace type energy-saving isothermal annealing furnace technology and heat recovery skills as one; the workpiece preheating as secondary energy development; has significant energy-saving effect. Take 250KW SLRTd-250 annealing furnace as an example; annual output value can reach 5400 tons; annual energy saving 800,000 degrees; compared with the usual energy-saving annealing furnace; annual electricity saving costs of 55-600,000 yuan. Two years of electricity-saving costs can be recovered from the entire equipment.
The processing quality of this furnace type is stable; the hardness of the bearing parts is HRB89-92; the metallographic arrangement is 2-3 grades; the pass rate is 100%.
4. Oil-electricity, gas-electric composite heating skills (1) oil-electric composite heating skills in the 1990s; southeastern coastal provinces lack of electricity and less coal; Jinzhou Electric Furnace Co., Ltd. has developed a roller-bottom type oil-electric composite heating isothermal spheroidizing annealing furnace; Successfully differentiated the pre-emptive process skills from the heat treatment equipment set; shortened the spheroidizing annealing of bearing steel to 8-9 hours; and the spheroidizing annealing micro-arrangement reached a uniform, subtle, diffuse, rounded ambition policy, preemptive The fuel skill makes the soot blackness series reach Ringermann level 1; it is fully in line with environmental protection needs.
(2) Gas-electric composite heating technology Natural gas is a high-quality primary energy; Jinzhou Electric Furnace Co., Ltd. combines the conditions of natural gas temperature control and electric heating temperature control; develops gas-electric composite heating roller bottom ball retreat Stove; completed the temperature control, electronic control, process control electromechanical integration; annealing quality domestically preemptive; energy saving level reached a new height.
5. Bearing steel intelligent annealing control system Hebei University of Technology College of Science and Technology to give full play to the advantages of the campus in mathematics, computers, electrical appliances, materials, software and other multidisciplinary; research and development of bearing steel intelligent annealing control system. In the full use of the company's original annealing furnace body In the case of the system, the system can be based on the thermal characteristics of the heating furnace, the temperature field dispersion, the amount of furnace loading, etc.; the parameters such as heating temperature and cooling rate of each zone are intelligently adjusted; the whole process of automatic control annealing is automatically controlled. Inaction is an operational element.
The characteristics of the system are: improve the quality of spheroidizing annealing, improve production power, save energy and reduce consumption.
(1) Excellent annealing quality: Annealing products using this skill; spheroidizing quality can achieve 2-3 level arrangement safely. It can reach the specifications of European SEP1520 for annealing of SKF, FAG and other world's largest bearing companies. Life and reliability lay the foundation for excellence.
(2) Progressive yield: The annealing cycle can shorten the annealing cycle by 1/3 to 1 times in the continuous (push-type) annealing furnace, and can be reduced from 15 hours in the current typical 36-hour cycle in the trolley type and through-cycle annealing furnace. Within.
(3) Energy saving and consumption reduction: the power consumption is greatly reduced; the current operating furnace is reduced from the current power consumption of 280-480KWh/ton; to 240KWh/ton, and the cycle operating furnace is reduced from the current 400-600KWh/ton; to 300 KWh/ Less than tons.
Under the premise of ensuring the annealing quality of 2-3 grades; this skill has been used in large-scale industrial production in many companies;
Hebei Rolling Mill Bearing Co., Ltd.; the daily output value of 6 tons before the transformation; power consumption 470KWh / ton, the daily output value after the transformation to 12 tons; power consumption will be 235KWh / ton.
Dalian Longyan Forging Factory; dispose of hot-rolled bearing steel balls with 540KW trolley-type furnace; daily output value is 15 tons; power consumption is 300KWh/ton; during this period, low-valley electricity accounts for more than 85% of total electricity consumption; annealing cost is about 130 yuan/ton.
Dalian Metallurgical Bearing Co., Ltd. has rebuilt three 360KW pusher type annealing furnaces for four consecutive years; the ferrule power consumption is ≤210KWh/ton; the annual production capacity has reached 25,000 tons, two 440KW bar annealing furnaces; daily disposal Φ20-Φ130 bar material 20 tons; power consumption ≤ 270KWh / ton; during the low valley accounted for more than 90% of the total amount; annealing power consumption cost <100 yuan / ton.
Shandong Liangshan Bearing Co., Ltd. before the transformation; annealing energy saving 1/3; production power improvement 1/3; not only that; because the annealing arrangement is fine; quenching temperature is reduced; holding time is shortened; quenching energy saving 8%.
Guangdong Shaoguan Southeast Bearing Co., Ltd. produces automobile hub bearings; the quality of the annealed after the transformation reaches the specifications of the European SEP1520 fulfilled by FAG; becomes the FAG semi-finished product supplier; only one annual quality benefit exceeds 10 million yuan.
The long-term use of many companies indicates that the skill is robust.
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