Large-scale steel casting production technology and slowly cooling device thereof
A production process and technology of slow cooling device, applied in the field of sand casting, can solve the problems of low production efficiency, too long heat preservation and slow cooling time, etc., and achieve the effects of improving casting production efficiency, advancing boxing time, and accelerating cooling.
Active Publication Date: 2012-07-04
CHINA ERZHONG GRP DEYANG HEAVY IND
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Problems solved by technology
[0003] In order to overcome the problem that the production efficiency is not high due to the long heat preservation and slow cooling time in the sand mold after pouring of the existing large-scale steel castings, the technical problem to be solved by the present invention is to provide a method that can improve the production rate while ensuring the casting quality. Production Technology of Large Steel Castings and Its Slow Cooling Device
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[0010] The present invention will be further described below in conjunction with the accompanying drawings.
[0011] The large-scale steel casting production process of the present invention comprises the following steps: modeling, pouring, heat preservation, boxing, sand shakeout, and cleaning. Slow cooling step: Put the steel casting 7 into a slow cooling device preheated to 500-600°C and cool it down to below 300°C at a temperature drop rate of 10-20°C / h, and then transfer to subsequent processes such as shakeout.
[0012] Such as figure 1 As shown, the high-temperature boxing process for large steel castings of the present invention adds a slow cooling step to the existing process. When the temperature of the steel castings is 750-850°C, that is, about 800°C, the steel castings 7 The boxing operation is carried out, and the boxed steel casting 7 is immediately transferred to a preheated slow cooling device, and cooled to below 300°C at a rate of 10-20°C / h. For steel cast...
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The invention discloses a big-size cast steel part manufacturing process, relating to the casting field of big-size cast steel part. The process includes the following steps: forming, casting, heat preservation, shaking-out, shaking and cleaning. In the heat preservation process, when the temperature of cast steel piece (7) is cooled to 750 to 850 DEG C and the shaking out is carried out, and then gradual cooling is carried out; the cast steel piece (7) is put into a pre-heated gradual-cooling device to be cooled to be under 300 DEG C with temperature-falling speed of 10 to 20 DEG C per hour,and then latter procedures such as the shaking, etc. are done. The invention also discloses one gradual cooling device used for the process. The gradual device is made of heat preservation materials and forms sealed space around the cast steel piece (7). The invention largely shortens the time which the cast steel part spends in occupying sand box, accessories and ground pits, etc., and can guarantee the quality and enhance the production efficiency of the big-size cast steel part. The invention is mainly applied to big-size cast steel pieces with more than 10-ton steel liquid used for resin-sand forming such as carbon steel, low-alloy steel and high-alloy steel, etc.
Description
technical field [0001] The invention relates to the field of sand casting, in particular to a box-making process after pouring large-scale steel castings such as carbon steel, low-alloy steel and high-alloy steel with a molten steel amount of more than 10 tons. Background technique [0002] At present, the traditional steel casting production process includes the following steps: molding, pouring, heat preservation, boxing, sand shaking, and cleaning. Among them, the boxing process of steel castings is that after the steel castings are poured, they must be slowly cooled to a low temperature in the sand mold, and then boxed at a temperature of about 300 ° C or even lower. Prevent cracks, deformation and other problems in steel castings. When the resin sand process is used to produce steel castings in the form of sand boxes, pits, and core groups, the cooling rate of the steel castings in the resin sand mold is slower, and the temperature drop is generally 1 to 10°C / h, result...
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IPC IPC(8): B22D27/20
Inventor 胡加尔唐贤其徐凤刚周向阳龚斌李道贵徐德明
Owner CHINA ERZHONG GRP DEYANG HEAVY IND