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What to pay attention to in the precision casting process of alloy steel

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2019-06-10

       Alloy Steel It can be used for casting dense casting and continuous casting processes, while the thicker and larger components may also be used to enhance the use of the work surface and by supplying cold forged steel. The key to precision casting of alloy steel is the hot rolling process, which directly determines the final use characteristics of alloy steel precision casting. Alloy steel is generally fully annealed + quenched + tempered hot x06581f process. Depending on the alloy content, the quenching temperature is usually selected at 880 to 930 ° C, the workpiece is uniformly heated and cooled, and the tempering temperature is 230 to 280 ° C, so the first type of tempering does not occur. Electric furnaces are used for quenching and tempering workpieces. With coal stoves and gas stoves, the uneven temperature of the furnace not only reduces the hardness of the worn parts, but also causes cracks that naturally age.


       1, must clean the surface defects of the ingot before heating, heating can prevent The defect or forging is further expanded. For some grades, mechanical peeling is required.

       Beginning with a preliminary tissue dummy to improve the ductility by forging pinholes, the high-alloy cast structure of the cast forging together severely segregates the particularly coarse columnar grains, and the ingots and coarse columnar carbides relax the flexible, intercrystalline Brittle failure plasticity is too large to approach time to improve the final forging temperature and avoid residual stress.

       3, High-alloy steel reticulated carbides are distributed very unevenly with coarse grains, which, forging of carbide equipment is greater than that of forging forging methods to obtain alternating stretching of large tablet tonnages requiring uniform uniform deformation in the tensile distribution, each Feed 0.8 it can be controlled within a variety of anvils 0.6.

         4. The upper and lower V-shaped anvils should be used to improve the stress condition. When the crack of the core tends to use the slab to flatten the anvil in the high alloy, when using a longitudinal crack as the anvil is in tension, the upper and lower V-shaped blanks are improved. In the fall, you can use a small Violet Morumoru or V-shaped drawing dies.

         5. The main conversion process must be carried out evenly at high temperatures. Chambers, punched and reamed high alloy steels cause casting failure due to easy cracking at low temperatures.

         6. The higher alloyed steel precision casting can greatly increase the plastic surface condition by 1.5 to 2 times without cutting and disassembly.

         7. High-alloy steel should be cooled at high speed after forging, preferably furnace cooling.

 

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