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Anneal oxidation method for punching slice in annealing oven

An annealing furnace and punching technology, which is applied in the annealing field of punching, can solve the problems that the magnetism of the punching sheet cannot achieve the ideal effect, the carbon content of the punching sheet is high, and the insulation of the oxide cannot achieve the ideal effect, etc.

Active Publication Date: 2009-07-29
TEMPLE CHANGZHOU PRECISION METAL PROD
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Problems solved by technology

[0006] However, the carbon content of the punched sheet processed by the above process is relatively high, so that the magnetic properties of the punched sheet cannot achieve the desired effect, and the insulation of the formed oxide cannot achieve the desired effect.
In addition, it is very important to control the uniform color of the punched sheet in the furnace, and it is difficult to obtain

Method used

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  • Anneal oxidation method for punching slice in annealing oven
  • Anneal oxidation method for punching slice in annealing oven

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Embodiment Construction

[0017] 1 and 2, what is shown in FIG. 1 is only a part of the annealing furnace. The annealing furnace in the figure includes a conveyor 14 with rollers to convey the tray 16 of the punching sheet 17, and the roller 15 of the conveyor 14 is driven by a gear 9. The conveying device 14 passes through the preheating zone of the annealing furnace, the high temperature zone (the preheating zone and the high temperature zone are not shown in the figure), the cooling zone 11, the purification zone 12, and the oxidation zone 13 in sequence. Anneal oxidation is carried out through the following steps:

[0018] The first is preheating and degreasing: the punched sheet is transported to a temperature of 400℃ for preheating, and the punched sheet is dried and degreasing.

[0019] The second is heating: the preheated and degreasing punch is transported to a high temperature zone for annealing at a temperature of 800°C, and nitrogen and hydrogen are introduced into the atmosphere of the high te...

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Abstract

The invention discloses an annealing and oxidizing method for an impact sheet of a motor or a transformer in an annealing furnace, comprising steps of sending the impact sheet to a cooling zone to be cooled to temperature of 600-1000 DEG F; sending the impact sheet to a purifying zone, isolating gas atmosphere of the cooling zone and gas atmosphere of an oxidizing zone by the purifying zone, and sending the impact sheet to the oxidizing zone; inletting nitrogen and air in the gas atmosphere of the oxidizing zone in which the nitrogen and air flow, wherein the oxidizing zone is provided with a plurality of gas injection syringes each of which is provided with a plurality of gas spraying devices; the gas spraying device is tightly near to a tray of a conveyer and causes oxidized atmosphere to form turbulent flow used to interrupt a dividing layer of inertial atmosphere of the impact sheet, provide reactive components for the surface of the impact sheet and supply reactive components needed by oxidizing between impact sheets. The method can decarburize the steel impact sheet, improve magnetism level of the impact sheet and generate a high-quality oxide layer to improve insulativity.

Description

Technical field [0001] The invention relates to an annealing method for punching sheets, in particular to an annealing and oxidation method for punching sheets such as motors or transformers in an annealing furnace. Background technique [0002] Motors, transformers, and other electronic equipment generally contain a magnetic pole formed by superimposing steel punches, and the magnetic flux is transferred through the magnetic circuit formed by the superimposed magnetic poles of these steel punches. In order to obtain good magnetic properties, the steel punching sheet is usually annealed in a box furnace with continuous rollers. [0003] Commonly used annealing furnaces include heating and cooling zones, followed by a purification zone and oxidation zone. In the existing punching sheet annealing process, rows of punching sheets are loaded on a tray and processed through a box furnace with continuous rollers. However, with the difference and change of the size and shape of the punc...

Claims

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Application Information

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IPC IPC(8): C21D1/26
Inventor 格温·约翰斯顿
Owner TEMPLE CHANGZHOU PRECISION METAL PROD
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