Method to Avoid Deformation and Cracking During Sintering of ES Magnetic Core

Abstract

This application discloses a method for avoiding deformation and cracking of ES magnetic cores during sintering. The pressed ES magnetic cores are sintered in a sintering kiln. The sintering kiln includes a first heating zone, a second heating zone, a heat preservation zone and Cooling zone, in which: the length of the first heating zone is 6 meters, and the ES core is slowly heated from room temperature to 300 ° C, and the heating time is 5 hours; the length of the second heating zone is 11 meters, and the ES core is heated from 300 ° C The temperature is raised to 1300°C, and the heating time is 9 hours. The length of the heat preservation zone is 8 meters, and the ES core is kept at 1320-1345°C for 6.5 hours; the length of the cooling zone is 13 meters, and the cooling time is 10.5 hours. The invention prolongs the sintering distance of 0-300°C in the heating zone, shortens the distance of the deglue zone by meters, adjusts the inlet temperature through the conversion of the two, and makes it slowly and steadily heat up to complete the process of water volatilization at 0-300°C.

Description

technical field [0001] The present application relates to a magnetic core for an electromagnetic oven, in particular to a method for avoiding deformation and cracking of an ES magnetic core during sintering. Background technique [0002] Due to the irregular shape of the ES core and the different lengths on both sides of the center column, the use of laminated sintering, due to the natural drop of the core during the sintering process, the product will sag, easily deformed, and the unevenness can reach 0.6mm. Many, unable to meet the requirement of ≤0.30mm, [0003] In addition, due to the large area of ​​the ES type magnetic core, it is often too late to volatilize the water in the sintering section of 0-300 degrees in the heating zone. After entering the heating zone, the water evaporates rapidly at high temperature and is cracked, which seriously affects the quality of the magnetic core product. The pass rate can be achieved by reducing the kiln speed without cracking, b...

AI Technical Summary

Problems solved by technology

[0002] Due to the irregular shape of the ES core and the different lengths on both sides of the center column, the use of laminated sintering, due to the natural drop of the core during the sintering process, the product will sag, easily deformed, and the unevenness can reach 0.6mm. Many, unable to meet the requirement of ≤0.30mm,

[0003] In addition, due to the large area of ​​the ES-type magnetic core, it is often too late to volatilize in the sintering section of 0-300 degrees in the heating zone. After entering the heating zone, the water evaporates rapidly at high temperature and is cracked, which seriously affects the quality of the magnetic core product. The pass rate can be achieved by reducing the kiln speed without cracking, but it seriously affects the production capacity and efficiency

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