Vacuum pulse hydrogen annealing apparatus and method for electric pure iron

A technology of vacuum pulse and hydrogen annealing, which is applied in the field of metal heat treatment, can solve the problems of inability to meet the needs of DT4 electrical pure iron processing, safety, explosion and other problems in annealing equipment, so as to reduce human factors, prevent atmosphere leakage, and achieve surface smoothness. Good results

Active Publication Date: 2013-01-30
NANJING CHENGUANG GRP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Ordinary hydrogen annealing furnaces are continuously fed with hydrogen under normal pressure, and the gas outlet is ignited to burn waste gas. There is a safety hazard in the annealing equipment. Once the hydrogen-oxygen ratio reaches 3:7, an explosion may occur
[0004] Therefore, existing devices and methods cannot meet the demand for DT4 electrical pure iron processing

Method used

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  • Vacuum pulse hydrogen annealing apparatus and method for electric pure iron
  • Vacuum pulse hydrogen annealing apparatus and method for electric pure iron
  • Vacuum pulse hydrogen annealing apparatus and method for electric pure iron

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Experimental program
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Effect test

Embodiment 1

[0048] Through the technical transformation of the original vacuum annealing furnace, an automatic pulse atmosphere control device was added, so that the original electrical pure iron vacuum hydrogen annealing manual control was changed to automatic control, which reduced the labor intensity of the operator and improved the heat treatment process. control precision. On this basis, the process test of DT4 electrical pure ferromagnetic material was carried out, and the obtained results showed that this technology can improve the magnetic performance and meet the higher magnetic performance index of DT4. Vacuum pulse hydrogen annealing also helps to improve the surface quality of DT4 electrical pure iron workpieces, making the workpiece surface smooth. The usual hydrogen annealing refers to the introduction of hydrogen gas under normal pressure. This technology allows DT4 electrical pure iron to pass hydrogen gas in a pulsed state under the vacuum state, and uses the reducibility...

Embodiment 2

[0059] A vacuum pulse hydrogen annealing method for electrical pure iron, comprising the following steps:

[0060] Step 1. Clean the workpiece with gasoline to make the surface of the workpiece free of dirt and oil stains;

[0061] Step 2, put the workpiece into the effective heating zone of the furnace body 1;

[0062] Step 3. Insert the thermocouple 3-1 from the furnace cover 3 into the effective heating zone in the furnace, and tighten the nut 3-2 to fix the thermocouple;

[0063] Step 4. Vacuumize the furnace body to make the vacuum degree reach 20Pa, and then heat the workpiece to raise the temperature of the workpiece to 800°C. Starting from 800°C, the temperature of the workpiece is raised to 880°C at a heating rate of 50°C / h. During the heating process, continuously evacuate the furnace body to keep the vacuum at 20Pa;

[0064] Step 5. Introduce hydrogen into the furnace, and keep the introduced hydrogen in the furnace for 600s, then extract the reacted waste gas out...

Embodiment 3

[0068] A vacuum pulse hydrogen annealing method for electrical pure iron, comprising the following steps:

[0069] Step 1. Clean the workpiece with gasoline to make the surface of the workpiece free of dirt and oil stains;

[0070] Step 2, put the workpiece into the effective heating zone of the furnace body 1;

[0071] Step 3. Insert the thermocouple 3-1 from the furnace cover 3 into the effective heating zone in the furnace, and tighten the nut 3-2 to fix the thermocouple;

[0072] Step 4. Vacuumize the furnace body to make the vacuum degree reach 20Pa, and then heat the workpiece to raise the temperature of the workpiece to 800°C. Starting from 800°C, the temperature of the workpiece is raised to 900°C at a heating rate of 50°C / h. During the heating process, continuously evacuate the furnace body to keep the vacuum at 20Pa;

[0073] Step 5. Introduce hydrogen into the furnace, and keep the hydrogen gas in the furnace for 650s, then extract the waste gas after reaction out...

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Abstract

The invention discloses a vacuum pulse hydrogen annealing apparatus for electric pure iron. The apparatus comprises a furnace body, a diffusion pump, a furnace lid, a flexible air inlet pipe, a flexible air outlet pipe, a butterfly valve and a diffusion pump air outlet pipe, wherein the furnace body is provided with the furnace lid and is connected with the diffusion pump, the flexible air inlet pipe of the diffusion pump is provided with a first solenoid valve, the diffusion pump air outlet pipe of the diffusion pump is provided with the butterfly valve and two air outlets, the air outlets are located at two sides of the butterfly valve and mutually connected through the flexible air inlet pipe, and the flexible air inlet pipe is provided with a second solenoid valve. According to the invention, an automatic control system is additionally arranged, process is simple and is easy to operate, the degrees of control accuracy and automation are improved, and manpower is saved.

Description

technical field [0001] The invention belongs to the field of metal heat treatment, in particular to an electric pure iron vacuum pulse hydrogen annealing device and method. Background technique [0002] DT4 electrical pure ferrous treatment uses vacuum annealing process and vacuum annealing furnace equipment, but there are defects. After treatment, the magnetic properties often fail to meet the technical requirements. There have been many batches of products that failed in performance, and repeated treatment still failed. Qualified, in the state of being scrapped, has become the bottleneck of model production. In addition, there are oxidized colors on the surface of the processed product, which will bring negative effects to the subsequent electroless plating, and even cause waste products. [0003] After that, consider using hydrogen reducibility, and use hydrogen annealing method for repair. Ordinary hydrogen annealing furnaces are continuously fed with hydrogen under no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/74C21D1/26
Inventor 程强
Owner NANJING CHENGUANG GRP
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