横笛吹雨 发表于 2009-4-8 11:30:05

How to control the cooling rate?

There is a thecnics "DISTENSIONE--STRESS RELIEVING"
1)        HEATING RATE LESS THAN 200℃/h
2)        FURNACE TEMPERATURE 630 TO 650℃
3)        TIME SOAKING: 1h
4)        COOLING RATE DOWN TO 300℃: 150℃/h
5)        COOLING FROM 300℃ IN STILLAIR.


How to control the cooling rate?

陆丰 发表于 2009-4-8 11:43:59

You can use the instrument to control, manual control can also be used.

stove 发表于 2009-4-8 12:02:16

What type of furnace,please?
Air-cooled?Can be frequency?

横笛吹雨 发表于 2009-4-8 12:15:23

But the cruciai question is that---the furnace temperature is reduced so slowly,we can open thefurnace door ,but the furnace temperature changes so fastthatwe can not control it.

Oh,my broken English:lol

横笛吹雨 发表于 2009-4-8 12:18:27

回复 3# stove 的帖子

It is car type furnace,and furnace cooling.

wty728 发表于 2009-4-8 12:26:31

you can set the few segments to control the cooling rate from the 650C to 300C，
for example 650C0.5h；600C 0.5h；550C 0.5h etc

userwuq 发表于 2009-4-8 12:35:05

sometimes we can get much faster cooling rate using the furnace fan without opening the door.

stove 发表于 2009-4-8 12:46:44

If you use the burner,May be able to pass into the air from the burner
If you use the above method,use a programmable temperature controller.

hongqk 发表于 2009-4-8 16:25:26

You can use other cooling medium through the furnace,it can take away heat .control the cooling medium flow rate.we can control the furnace cooling rate.

greatmanzhang 发表于 2009-4-8 17:01:17

if the furnace have not the cooling system, that will be hard to control it, in my opinion, you can add some the an air cooling equipment, control the cooling rate by control the air speed.

横笛吹雨 发表于 2009-4-8 17:11:41

回复9#hongqk　ａｎｄ 10# greatmanzhang 的帖子

Ｉｔ　ｉｓ　ａ　ｇｏｏｄ　ｉｄｅａ，ｂｕｔ　ｎｅｅｄｓ　ｔｏ　ｒｅｍｏｕｌｄ　ｔｈｅ　ｆｕｒｎａｃｅ

察哈尔汗 发表于 2009-4-8 17:23:39

reply to WJFU66

it is difficult to assure the cooling speed on your equipment .
i agree to remould the furnace, add a PLC and airpump to control the cooling and heating rate .

tong 发表于 2009-4-11 18:36:00

回复 4# WJFU66 的帖子

this means you have a good furnace with less energy loss.
do you think it's help if you choose an old worn equipment or reduce your loading?

横笛吹雨 发表于 2009-4-11 21:05:51

回复 13# tong 的帖子

Thanks,butI think it is impossible,furnace cooling rate is slow yet.

men4men 发表于 2009-4-13 11:14:42

it's up to you chose what to cooling it,generally, at start youcan use of cooling air,when it reach 400 degree,cooling it with water,then the cooling rate is faster than norm.

Diego001 发表于 2009-5-12 22:21:46

150C/h from high temperature to 300,and according to the tyre of furnace ,I think cooling with the furnace while oopening the door !the cooling rate maybe middle of A and N.
just my own opinion ,maybe right maybe wrong !
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