Casting of 150t converter gear shaft Wang Yang, Xu Yan 2 (. Panzhihua Machinery Co., Ltd. Foundry Branch, Panzhihua 617063, Sichuan; 2 Pangang Cold Rolling Co., Ltd., Panzhihua 617063, Sichuan) Main business: This paper introduces the gear for casting 150t converter The shaft adopts a metal type hanging sand, an electric heating device to prolong the solidification time, and a diffusion annealing and grain refining process on the casting, so that the cast converter gear shaft completely meets the technical requirements.
The process is processed to eliminate the coarse grains produced by the casting process, thereby ensuring the intrinsic quality of the product.
Figure is as follows.
The gear shaft of the 150t converter is made of ZG35CrMoV, and the casting has a single weight of 245t. Since the gear shaft is used under the working conditions of heavy-duty low-speed transmission, the quality requirements are strict. The former converter gear shafts are forged by heavy-duty forging equipment, while the general machinery factory often does not have heavy forging equipment. The use of casting and forging technology is a better method to solve this problem, and can be greatly shortened under the premise of ensuring casting quality. Production cycle, saving production costs.
Type, for the sanding type of concession, add 15% type of hanging sand layer when mixing sand, to ensure that the hanging sand layer is uniform, the thickness of the hanging sand layer is 15~25mm, and the compactness is appropriate.
The base zircon powder coating, after flattening, brush the paint again and let it dry.
The metal type after hanging sand molding is baked in the drying kiln for 4 ~ 5h. When the temperature is combined, the positioning of each mold is aligned, the sealing surface is blocked by mud, and the gaps in the cavity after the box are combined. Smooth with zircon powder coating paste, and finally remove the sand and other impurities in the cavity.
When tapping, the steel is selected and poured at a low temperature. When the liquid level of the molten steel rises to 1/2 of the riser, the molten steel is injected from the riser, and after pouring, the riser is refilled twice with hot molten steel.
After the pouring is completed, the heating electrode is inserted into the center of the riser, and the main body of the gear shaft inserted into the 150t converter of the deep casting process is: the largest diameter is 1250mm, the length is 3700mm, and the single weight of the casting blank is 24.5t, which is a thick-walled super large steel casting. The hot section is large, and it is easy to produce casting defects such as shrinkage, shrinkage, and crack.
In order to ensure the quality of castings, metal-type hanging sand can be used for production. For this purpose, special metal tooling is specially designed for casting. In order to facilitate styling and boxing, the metal type tooling needs to be divided into five layers, the bottom layer is provided with a base box, and the pouring system is placed. The top of the metal box is provided with a riser and a heating electrode is conveniently inserted.
In order to ensure the feeding effect of the riser, in order to ensure the feeding effect of the riser, the molten steel is refilled into the riser after pouring, and the heating device is heated to heat the riser to finally cool the riser position to achieve sequential solidification. the goal of.
The bottom injection type pouring system is used to increase the pouring speed and ensure the steady rise of the molten steel. Two sprues are provided. When the pouring, the two ladle are simultaneously opened, and the molten steel can be quickly filled from the bottom of the casting through the two sprues.
The gear shaft is a large rotating shaft with large section and slow cooling, so the as-cast microstructure of the casting is coarse. Therefore, the heat of diffusion annealing and quenching and tempering is adopted: 199å±®0å±®16 received the first draft, 199å±®11-25 received Revised draft.
The degree is 500mm, and the electric heating process curve is as shown.
After the electric heating is completed for 24 hours, the box is punched, the sand layer and the flash edge of the casting surface are removed, and then the furnace is slowly cooled to room temperature.
The castings are diffusion annealed to eliminate the coarse weiss structure generated during the casting process and to refine the grains. The annealing process is as shown.
Time / h electric heating process curve casting annealing process casting converter gear shaft blanks, some of the surface has some sticky sand, the feeder is good for shrinkage, after roughing, the casting surface has no casting defects such as pores, sand, shrinkage holes, etc. Ultrasonic flaw detection conforms to the technical requirements of the drawings. Therefore, the ZG35CrMoV converter gear shaft can be produced by this casting method, which can completely replace the forged steel parts. The cost saving in the mass production is about 30% than that of the forged steel parts. (Editor: Zhang Yunhua) hI Henan Xinyang Pingqiao District Shenguang bentonite plant casting The industry provides high-quality casting calcium-based bentonite, sodium-based bentonite, lithium-based bentonite and other products. Our factory is a professional manufacturer of bentonite deep processing, with complete equipment, advanced and strict production technology, perfect quality testing means, to Xinyang non-metal Based on the high-quality mine source, it has been extensively developed and utilized. The series of bentonite produced has the following functions and characteristics: Calcium-based bentonite: used for casting sand and binder, which is good for overcoming the “sand†and “skinning†of castings. "The phenomenon of reducing the scrap rate of the castings is conducive to improving the precision of the castings and improving the coarseness.
Sodium bentonite: A thickener used in precision casting and architectural coatings to prevent precipitation and agglomeration of pigments in paints.
Ricky bentonite: a suspending agent used in foundry coatings and architectural coatings. It has obvious suspension and dispersion and thickening effect to prevent coating precipitation and prolong storage time.
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