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

Abstract

The invention relates to a sieve plate for stone classification by using ultra-high manganese steel and a manufacturing method thereof. First, a molding sand forming mold or lost foam of an ultra-high manganese steel sieve plate is made, and 73.8-84.5% iron, 14.01-25% manganese, 0.8-1.6% carbon and 0.4-3.2% silicon are melted into ultra-high manganese steel molten steel with a temperature of 1350-1600 ℃, and then injected into the ultra-high manganese steel sieve sand forming mold or lost foam. Take out the casting from the cavity and polish off the burrs, and then continuously heat up to 650°C to 700°C at a rate of 50°C to 60°C per hour, keep the temperature for 1 to 2 hours, and then increase the temperature at a rate of 50°C to 60°C per hour. The temperature is raised to 950~1200℃, and the temperature is kept for 1~2 hours. The castings are immediately cooled by strong air blowing and water spray, and the cooled castings are flattened by rolling equipment to obtain sieve plates for stone classification.

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

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