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Alloy steel shot preparation method and device therefor

A preparation device and alloy steel technology, which is applied in the field of devices for preparing alloy steel shots, can solve the problems of reducing product strength and long throwing distance, and achieve the effects of increased yield, reduced oxidation, and low porosity

Active Publication Date: 2009-12-30
连云港倍特超微粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that due to the high-speed rotation of the centrifuge, the droplet is thrown out for a long distance. Generally, a pool with a diameter of more than 15 meters is required. The molten alloy steel drops into the water after gradually dropping to a lower temperature during the flight, which has the advantages of A certain annealing effect reduces the strength of the product

Method used

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  • Alloy steel shot preparation method and device therefor
  • Alloy steel shot preparation method and device therefor

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Embodiment 1

[0039] The speed of the centrifugal pellet making machine 7 is controlled at 850 rpm; the diameter of the annular water spray device is Ф6m, the width of the water tank is 300mm, and the depth is 300mm; the diameter of the water spray pipe is Ф32×3mm; a Ф3mm round hole is placed under the water spray pipe, and the distance is 20mm, there are 6 water inlet pipes, which are installed on the annular water spray pipe with a difference of 90°, and the total water inlet is 50m 3 / h, a total of 6 support frames are set up. After being thrown out of the centrifugal pelletizing cup, the molten alloy steel is cooled to become solid particles after flying for about 2.5m, and rapidly quenched and cooled at the 3m annular water curtain. The average particle size of the manufactured alloy steel shot is 1.5mm, and a tempering treatment is carried out in the subsequent heat treatment process. The average strength of the product is tested to reach HRC48.5, which meets the standard requirements...

Embodiment 2

[0041]The speed of the centrifugal pelletizing machine is controlled at 950 rpm; the diameter of the ring water spraying device is Ф4m, the width of the water tank is 200mm, and the depth is 300mm; the diameter of the water spray pipe is Ф25×3mm, and a Ф2mm round hole is placed under the water spray pipe with a distance of 20mm; There are 4 water inlet pipes in total, which are installed at 90° intervals on the annular water spray pipe, and the total water inlet is 30m 3 / h, a total of 4 support frames are set up. After being thrown out of the centrifugal pelletizing cup, the molten alloy steel is cooled to become solid particles after flying for about 1.5m, and rapidly quenched and cooled at the 2m annular water curtain. The average particle size of the manufactured alloy steel shot is 1.0mm, and a tempering treatment is carried out in the subsequent heat treatment process. After testing, the average strength of the product reaches HRC47.8, which meets the standard requiremen...

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Abstract

The invention discloses an alloy steel shot preparation method and a device therefor; the method is characterized in that a ring-shaped spraying device is additionally arranged outside a centrifugal shot making machine to lead alloy steel melt liquid to obtain small liquid drops by being ejected from a centrifugal machine, and then the small liquid drops are quenched by shock chilling via water, so that a microstructure of the alloy steel shot is improved, the strength of the alloy steel shot is enhanced, the alloy steel shot oxidation is reduced and finished product ratio is increased through shortening the retention time of the high-temperature alloy steel shot in the air. The invention has the characteristic of obviously improved strength of the alloy steel shot, and can cancel subsequent quenching process, thus simplifying production processes.

Description

technical field [0001] The invention relates to a device and method for preparing alloy steel shots. Background technique [0002] In the field of metal casting, it is a common surface treatment method to remove burrs, derust and polish metal castings through shot blasting and shot blasting. Among them, the shot blasting materials with the largest amount are alloy steel shot and alloy steel powder. The strength and hardness of alloy steel shot (powder) are very important for shot blasting. The basic principle of preparing alloy steel shot and alloy steel powder is to use a certain form and size of energy to crush the molten steel with cohesive force, so that the crushed steel droplet will shrink by its own surface tension during the cooling and solidification process. pill. There are two commonly used preparation methods: one is the water jet method, which disperses the molten alloy steel into small droplets through rapid jetting of water, and then shrinks into spherical p...

Claims

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Application Information

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IPC IPC(8): B22F9/10
Inventor 胡永其孟令光赵风云
Owner 连云港倍特超微粉有限公司
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