Lifting appliance for rapidly replacing continuous casting dummy bar head
A dummy head and hanger technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem that the dummy head cannot be matched, the life safety of the operator is dangerous, and it is easy to hit the operator, etc. question
Active Publication Date: 2020-09-29
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004]
And in the production process, due to the high temperature in the production process, the surface deformation of the dummy head spreader is relatively large, and the deformation of the thread hole often occurs, which leads to the limited use of the spreader and cannot be well matched with the dummy head
[0005]
At present, the optimization of human resources has created a requirement for the reduction of personnel, and the operation by two people is not suitable for the current production situation.
Moreover, the relatively cumbersome dummy head is easy to hit the operator's feet when used, which is also dangerous to the operator's life safety.
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[0026] A nitriding treatment process for the surface of the suspender hanging plate for quick replacement of the continuous casting dummy head, such as figure 1 As shown, it includes the following steps:
[0027] (1) Put the hanging plate 3 of the hanger into the nitriding furnace, heat up from 25°C to 350°C at a constant speed, and the heating process is completed within 4 hours;
[0028] (2) heat preservation at 350°C for 4 hours;
[0029] (3) From 350°C to 500°C at a constant speed, the heating process is completed within 2.5 hours;
[0030] (4) heat preservation at 500°C for 28 hours;
[0031] (5) Cool down from 500°C to 25°C at a constant speed, and the cooling process is completed within 8 hours.
[0032] Its temperature change curve is as figure 1 shown.
[0033] In the process of nitriding treatment, the mixed gas of ammonia gas and nitrogen gas with a volume ratio of 3:1 is first introduced into the nitriding furnace, and then ammonia gas is supplemented during t...
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Abstract
The invention relates to a lifting appliance for rapidly replacing a continuous casting dummy bar head as well as a lifting plate surface nitriding treatment process. The lifting plate surface nitriding treatment process comprises the following steps that (1) a lifting plate of the lifting appliance is put into a nitriding furnace, the temperature is increased to 350 DEG C from the room temperature, and the temperature increasing process is completed within 4-5 hours; (2), the temperature of 350 DEG C is kept for 4-5 hours; (3), the temperature is increased to 500 DEG C from 350 DEG C, and thetemperature increasing process is completed within 2-3 hours; (4), the temperature is kept at 500 DEG C for 25-30 hours; and (5), the temperature is decreased to room temperature from 500 DEG C, andthe temperature decreasing process is completed within 7-8 hours. The lifting appliance can be widely applied to production procedures in continuous steel casting, the production labor amount is reduced, and the operation efficiency is improved.
Description
technical field [0001] The invention relates to a continuous casting steel machine, which belongs to the application field of continuous casting equipment, in particular to a device for replacing dummy heads of continuous casting. Background technique [0002] During the continuous casting production process, dummy heads need to be replaced according to the production size. There are a few questions: [0003] In the process of large-section dummy heads and small-section dummy heads, the old dummy head should be hoisted from the dummy bar car, and the dummy head of the new production section should be hoisted up. The frequent replacement of the dummy head increases the workload of the operation, and the hanger used by the currently used dummy head is relatively complicated and requires the cooperation of two or more people. One person operates the dummy head, and one person inserts the two lifting lugs of the spreader into the two sides of the dummy head respectively. [0...
Claims
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IPC IPC(8): C23C8/24B22D11/08
CPCC23C8/24B22D11/083
Inventor 吴杰赵显久刘才福
Owner BAOSHAN IRON & STEEL CO LTD