Ultra-high manganese steel sieve plate for sorting stone material and its making method

Abstract

The invention relates to a sieve plate which is made of super high manganese carbon steel and used for stone gradation and a preparation method hereof; the super high manganese carbon steel sieve plate molding sand forming mold or lost mold is made first and then 73.8 percent to 84.5 percent of iron, 14.01 percent to 25 percent of manganese, 0.8 percent to 1.6 percent of carbon and 0.4 percent to 3.2 percent of silicon are melted into the super manganese carbon steel water with a temperature of 1350 to 1600 Celsius degrees; and then the steel water is poured into the super high manganese carbon steel sieve plate molding sand forming mold or lost mold and the cast is taken out from the mold cavity after the water is cooled naturally and then the cast is polished to remove the burr; and then the temperature is continuously increased with a magnitude of increasing 50 to 60 Celsius degrees per hour until 650 to 700 Celsius degrees; and then the cast is insulated for one to two hours; the cast is cooled fast with strong blowing wind and sprayed water mist immediately after being discharged from furnace and the cooled cast is flattened by a rolling equipment to obtain the sieve plate which is used for stone gradation.

Description

technical field [0001] The invention relates to a sieve plate for grading stones made of ultra-high manganese steel and a manufacturing method thereof, belonging to the field of sieve plate manufacture. Background technique [0002] The applicant's authorized announcement number is CN1214372C, titled "Sieve plate for stone classification and its manufacturing method", and the sieve plate includes a high manganese steel base plate with several sieve holes. When the sieve plate is cast, the cavity conforming to the specifications of the sieve plate and the core holes conforming to the position of each sieve hole are first molded in the lower box sand with a mold, and a cylindrical oil sand core of uniform size is placed in each core hole. The height above the sand surface of the lower box is slightly greater than the thickness of the sieve plate. Cover the upper box and inject high manganese steel molten steel at 1350-1600 ° C. After cooling and deburring, put it into the heat...

AI Technical Summary

Problems solved by technology

Although the frequency of changing the sieve plate of the above products is greatly reduced, the maintenance workload is reduced, the screening quality of the stone is guaranteed, and the cost is reduced. The replaced sieve plate can also be used as a raw material to return to the furnace to produce a new sieve plate, reducing pollution. Good economic and environmental benefits have been achieved. However, in practical applications, due to the different materials and hardness of stone materials, the screening effects produced are completely different.

Especially for hard materials with relatively high hardness grade of stone material, due to the insufficient manganese content in the high manganese steel sieve plate, the surface hardness of the formed high manganese steel sieve plate is not enough to compete with the stone under high frequency vibration. The impact and wear on it cause the high manganese steel sieve plate to not only wear fast and have a short life, but also be easily damaged by high-frequency vibrating stones, resulting in frequent replacement of high manganese steel sieve plates, which directly affects the screening efficiency of stones, and Causes a substantial increase in the cost of the screened product

Images